TW202513379A - Baby stroller - Google Patents

Abstract

The present invention relates to a baby stroller. The baby stroller body (11) comprises: a main body frame (12), which comprises front legs (14) and rear legs (16); a handle (30) mounted on the main body frame (12) in a swingable manner; a seat support unit (40) held on the main body frame (12); a front wheel rotation axis retaining component (18c) which retains the front wheel rotation axis (18b); and a rear wheel rotation axis retaining component (19c) which retains the rear wheel rotation axis (19b). The front wheel rotation axis retaining component (18c) is connected to the front legs (14), and the rear wheel rotation axis retaining component (19c) is connected to the rear legs (16). The front wheel rotation axis retaining component (18c) can move in the front and rear directions relative to the front legs (14). The rear wheel rotating shaft retaining component (19c) can move in the front-rear direction relative to the rear leg (16).

Description

Baby stroller

The present invention relates to a baby stroller.

Strollers for taking babies out are becoming increasingly popular. Strollers have a seat support unit that supports a seat on which a baby sits, a main body frame that supports the seat support unit, and a handle mounted on the main body frame. An operator of the stroller (guardian, etc.) can adjust the direction of travel of the stroller and change the inclination of the stroller to go over steps by operating the handle. Patent document 1 discloses a stroller in which the position of the handle can be switched between a back-pushing position and a face-to-face pushing position.

Patent document 1: Japanese Patent Application Publication No. 2018-202982.

In a stroller that can switch the position of the handle between a back-pushing position and a face-to-face pushing position, the distance in the front-to-back direction between the rear wheel and the center of gravity of a baby on the stroller and the distance in the front-to-back direction between the front wheel and the center of gravity are usually different. Therefore, the operability of the stroller is different when the handle is arranged in the back-pushing position and when the handle is arranged in the face-to-face pushing position. For example, in a stroller in which the distance in the front-to-back direction between the rear wheel and the center of gravity is shorter than the distance in the front-to-back direction between the front wheel and the center of gravity, the operation of the stroller becomes difficult when the handle is arranged in the face-to-face pushing position compared to when the handle is arranged in the back-pushing position. [Technical Problem]

The present invention is completed in consideration of the above situation, and its purpose is to make the baby stroller easy to operate in both cases where the handle is arranged in the back push position and the handle is arranged in the face-to-face push position. [Technical solution]

An embodiment of the present invention relates to the following [1] to [12].

[1] A baby stroller having a baby stroller body, the baby stroller body comprising: a body frame including front legs and rear legs; a handle mounted on the body frame in a manner capable of swinging in the front-rear direction; a seat support unit held on the body frame; a front wheel capable of rotating about a front wheel rotation axis extending in the horizontal direction; a front wheel rotation axis retaining component connected to the front legs and retaining the front wheel rotation axis; a rear wheel capable of rotating about a rear wheel rotation axis extending in the horizontal direction; and a rear wheel rotation axis retaining component connected to the rear legs and retaining the rear wheel rotation axis, the front wheel rotation axis retaining component being capable of moving in the front-rear direction relative to the front legs, The rear wheel rotating shaft retaining component can move in the front-rear direction relative to the rear legs.

[2] According to the stroller described in [1], the stroller body includes a linkage mechanism, and the linkage mechanism causes the front wheel rotation shaft retaining component to move in the front-rear direction relative to the front legs and causes the rear wheel rotation shaft retaining component to move in the front-rear direction relative to the rear legs according to the swing of the handle.

[3] According to the stroller described in [2], the handle can be swung in the front-to-back direction between a rear-pushing position and a face-to-face pushing position, when the handle is in the rear-pushing position, the front wheel swivel shaft retaining component and the rear wheel swivel shaft retaining component are in a first position, and when the handle is in the face-to-face pushing position, the front wheel swivel shaft retaining component and the rear wheel swivel shaft retaining component are in a second position that is further rearward than the first position.

[4] According to the stroller described in [3], the front wheel pivot axis retaining member can rotate around the front wheel pivot axis extending in the vertical direction, and the distance between the first position and the second position in the front-rear direction is more than twice the distance between the front wheel pivot axis and the front wheel pivot axis in the horizontal direction in a plane perpendicular to the front wheel pivot axis.

[5] The stroller body according to [1] to [4] includes a locking component, which can fix the front wheel rotation axis retaining component and the rear wheel rotation axis retaining component relative to the front leg and the rear leg respectively.

[6] A baby stroller having a baby stroller body, the baby stroller body comprising: a body frame including front legs and rear legs; a handle mounted on the body frame in a manner capable of swinging in the front-rear direction; a seat support unit held on the body frame; a front wheel capable of rotating around a front wheel rotation axis extending in the horizontal direction; a rear wheel capable of rotating around a rear wheel rotation axis extending in the horizontal direction; the front legs hold the front wheel rotation axis so as to be movable in the front-rear direction, and the rear legs hold the rear wheel rotation axis so as to be movable in the front-rear direction.

[7] A baby stroller having a baby stroller body, the baby stroller body comprising: a body frame including front legs and rear legs; a handle mounted on the body frame in a manner that allows it to swing in the front-rear direction; a seat support unit held on the body frame; a front wheel mounted on the lower portion of the front legs and capable of rotating around a front wheel rotation axis extending in the horizontal direction; and a rear wheel mounted on the lower portion of the rear legs and capable of rotating around a rear wheel rotation axis extending in the horizontal direction, the front legs comprising a front leg upper member forming an upper portion of the front legs and a front leg lower member forming a lower portion of the front legs, the front leg lower member being capable of rotating relative to the front leg upper member around a front leg rotation axis along a vertical direction, The rear leg includes a rear leg upper member constituting the upper part of the rear leg and a rear leg lower member constituting the lower part of the rear leg, The rear leg lower member can rotate relative to the rear leg upper member around the rear leg rotation axis along the lead-vertical direction, By rotating the front leg lower member relative to the front leg upper member, the position of the front wheel relative to the seat support unit in the front-back direction is changed, By rotating the rear leg lower member relative to the rear leg upper member, the position of the rear wheel relative to the seat support unit in the front-back direction is changed.

[8] According to the stroller described in [7], the front leg rotation axis passes through the front leg upper member, the front leg lower member is connected to the front leg upper member on the radially outer side of a circle centered on the front leg rotation axis, the rear leg rotation axis passes through the rear leg upper member, and the rear leg lower member is connected to the rear leg upper member on the radially outer side of a circle centered on the rear leg rotation axis.

[9] According to the stroller described in [7] or [8], the lower member of the front legs and the lower member of the rear legs are inclined relative to the vertical direction.

[10] According to any one of [7] to [9], the stroller body includes a linkage mechanism, which causes the front leg lower member to rotate relative to the front leg upper member and the rear leg lower member to rotate relative to the rear leg upper member in response to the swing of the handle.

[11] According to the stroller described in [10], the handle can be swung in the front-to-back direction between a rear-pushing position and a face-to-face pushing position, when the handle is located at the rear-pushing position, the front wheel and the rear wheel are located at a third position, and when the handle is located at the face-to-face pushing position, the front wheel and the rear wheel are located at a fourth position further rearward than the third position.

[12] According to the stroller described in [7] to [11], the stroller body includes a locking component, and the locking component can fix the front leg lower component and the rear leg lower component relative to the front leg upper component and the rear leg upper component respectively.

According to the present invention, the operability of the stroller can be improved when the handle is arranged at the back-pushing position or the handle is arranged at the face-to-face pushing position.

＜＜First implementation method＞＞

Hereinafter, a first embodiment of the present invention will be described with reference to a specific example shown in the drawings.

Fig. 1 to Fig. 4 are figures for explaining the first embodiment of the baby stroller of the present invention. Among them, the overall structure of a specific example of the baby stroller is shown in Fig. 1 to Fig. 4.

The stroller 10 of the present embodiment includes a stroller body 11. As shown in FIG1 , the stroller body 11 as a whole has a substantially symmetrical structure with the plane along the front-rear direction and the up-down direction as the center. The stroller body 11 includes: a main body frame 12 having front legs 14 and rear legs 16; a handle 30 mounted on the main body frame 12; and a seat support unit 40 supported by the main body frame 12.

The handle 30 can be swung in the front-rear direction relative to the main frame 12. The handle 30 can change its position between the back-pushing position shown in FIG. 2 and the face-to-face pushing position shown in FIG. 3. When the handle 30 is arranged in the back-pushing position, the operator (guardian) holds the handle 30 from the back side of the infant to operate the stroller 10. At this time, the front leg 14 side of the stroller 10 becomes the front in the direction of travel. When the handle 30 is arranged in the face-to-face pushing position, the operator holds the handle 30 from the side facing the infant to operate the stroller 10. At this time, the rear leg 16 side of the stroller 10 is the front in the direction of travel.

The seat support unit 40 supports a seat cushion on which an infant sitting in the stroller 10 sits. The seat support unit 40 supports the infant sitting in the stroller main body 11 from below via the seat cushion.

In addition, in this specification, unless otherwise specified, the terms "front", "rear", "up", "down", "front-rear direction", and "up-down direction" with respect to a stroller and its components refer to the "front", "rear", "up", "down", "front-rear direction", and "up-down direction" based on the stroller in the unfolded state and the infant riding in the components. In more detail, the "front-rear direction" refers to the direction connecting the lower left and upper right of the paper in FIG. 1 , which is equivalent to the left-right direction of the paper in FIG. 2 and FIG. 3 . Furthermore, unless otherwise specified, "front" refers to the side toward which the infant riding in the stroller is facing, and the lower left side of the paper in FIG. 1 and the left side of the paper in FIG. 2 and FIG. 3 are the front side. On the other hand, the "up-down direction" refers to the direction perpendicular to the travel surface of the stroller. Therefore, when the travel surface is a horizontal surface, the "up-down direction" refers to the vertical direction. In addition, the "lateral direction" refers to the width direction, which is a direction orthogonal to both the "front-rear direction" and the "up-down direction". Moreover, the "back side" refers to the side opposite to the side facing the infant riding in the stroller 10. Therefore, the "back side" is usually the back side.

In this specification, the inner side in the width direction refers to a side closer to the center of the stroller body 11 in the width direction. On the other hand, the outer side in the width direction refers to a side farther from the center of the stroller body 11 in the width direction.

In a specific example shown in Fig. 1 to Fig. 4, the stroller main body 11 can be folded. Hereinafter, each component constituting the stroller main body 11 will be described in further detail.

(Main body frame) As shown in FIG. 1 , the main body frame 12 has a pair of front legs 14 disposed on the left and right, respectively, and a pair of rear legs 16 disposed on the left and right, respectively. The main body frame 12 also has a first link member L1, a second link member L2, a third link member L3, and a fourth link member L4 disposed on the left and right, respectively. The front legs 14, the rear legs 16, and the first link member L1 to the fourth link member L4 function as link members that configure the main body frame 12 to be foldable and unfoldable. In the illustrated example, the first link member L1 also functions as an armrest. That is, the first link member L1 is constituted by the armrest.

A front wheel 18 is rotatably provided at the lower end of the front leg 14, and a rear wheel 19 is rotatably provided at the lower end of the rear leg 16. The front wheel 18 is rotatable around a front wheel rotating shaft 18b extending in the horizontal direction. The front wheel rotating shaft 18b is held by a front wheel rotating shaft holding component 18c connected to the front leg 14. The front wheel rotating shaft holding component 18c is connected to the front leg 14 in a rotatable manner around a front wheel rotating shaft 18d extending in the vertical direction. In this way, the front wheel rotating shaft holding component 18c and the front wheel 18 constitute a caster. In addition, the rear wheel 19 is rotatable around a rear wheel rotating shaft 19b extending in the horizontal direction. The rear wheel rotating shaft 19b is held by a rear wheel rotating shaft holding member 19c connected to the rear leg 16. The rear wheel rotating shaft holding member 19c is connected to the rear leg 16 in a manner that it can rotate around a rear wheel rotating shaft 19d extending in the vertical direction. In this way, the rear wheel rotating shaft holding member 19c and the rear wheel 19 constitute a caster. The front leg 14 and the rear leg 16 will be described in detail later.

As shown in FIG2 , the upper end of the front leg 14 is connected to the front portion of the first link member L1 disposed on the opposite side (left or right side) in a rotatable (swingable) manner. The upper end of the rear leg 16 is connected to the front portion of the first link member L1 disposed on the opposite side (left or right side) in a rotatable (swingable) manner. In addition, as shown in FIG1 , the upper portion of the second link member L2 is connected to the rear portion of the first link member L1 disposed on the opposite side (left or right side) in a rotatable (swingable) manner. The second link member L2 is supported by the rear leg 16 when the main frame 12 is unfolded.

The third link member L3 is disposed between the front leg 14 and the second link member L2. The third link member L3 is connected to the middle portion of the front leg 14 at its front portion. The third link member L3 can rotate relative to the front leg 14 around a rotation axis extending in the width direction. Moreover, the third link member L3 is connected to the lower portion of the second link member L2 at its rear portion. The third link member L3 can rotate relative to the second link member L2 around a rotation axis extending in the width direction.

As shown in Fig. 2 and Fig. 3, the third link member L3 is connected to the second link member L2 via the shaft member 20 extending in the width direction. In addition, the third link member L3 is connected to the front leg 14 via a shaft member (not shown) extending in the width direction. Therefore, the pair of third link members L3 rotate synchronously with each other relative to the front leg 14 and the second link member L2.

As shown in FIG. 1 , in the illustrated example, the fourth link member L4 is rotatably connected to the rear leg 16. The fourth link member L4 is rotatably connected to the middle portion of the rear leg 16 at its lower portion. The fourth link member L4 is rotatably connected to the second link member L2 and the third link member L3. In the illustrated example, the second link member L2, the third link member L3, and the fourth link member L4 are rotatably connected to each other using the same shaft member 20. The shaft member 20 passes through the second link member L2, the fourth link member L4, and the third link member L3. According to this configuration, the second link member L2, the third link member L3, and the fourth link member L4 can rotate relative to each other around an axis that coincides with the central axis of the shaft member 20.

In addition, as shown in FIG. 1 , the main frame 12 has a front connecting member 15 connecting a pair of front legs 14 and a rear connecting member 17 connecting a pair of rear legs 16 as structural members extending in the lateral direction. The front connecting member 15 functions as a footrest. In addition, a central connecting member 21 is provided between a pair of third link members L3. By means of the front connecting member 15, the rear connecting member 17 and the central connecting member 21, the lateral deformation of the stroller 10 can be suppressed.

(Handle) As described above, the handle 30 can be swung forward and backward relative to the main frame 12. The handle 30 can be swung between a back push position (see FIG. 2 ) and a face-to-face push position (see FIG. 3 ). In the illustrated example, the handle 30 is tilted relative to the plumb direction and extends rearward in the back push position. The handle 30 is tilted relative to the plumb direction and extends forward in the face-to-face push position.

In the illustrated example, the handle 30 includes a handle body 31 movably mounted on the main body frame 12 and a holding body 35 provided on the handle body 31 .

As shown in FIG. 1 , the handle body 31 has a generally U-shaped shape. The handle body 31 is connected to the main frame 12 at both ends of the U in a rotatable (swingable) manner. The handle body 31 includes a pair of handle extensions 32 extending approximately parallel to each other and a middle portion 33 connecting the pair of handle extensions 32. The pair of handle extensions 32 are arranged on the outer sides of the width direction of the main frame 12. Each handle extension 32 is connected to the main frame 12 at its lower end in a rotatable manner. The middle portion 33 is a gripping portion for the operator (guardian) to grip.

In the illustrated example, the handle body 31 is rotatably connected to the main body frame 12 using the shaft member 20. That is, the second link member L2, the third link member L3, the fourth link member L4 and the handle 30 can rotate relative to each other around the same axis divided by the shaft member 20. By engaging the retaining body 35 provided on the handle 30 with the first retaining member 36 (refer to FIG. 3) of the main body frame 12, the handle 30 can be maintained in the back push position shown in FIG. 2. By engaging the retaining body 35 provided on the handle 30 with the second retaining member 37 (refer to FIG. 2) of the main body frame 12, the handle 30 can be maintained in the face-to-face push position shown in FIG. 3.

The stroller body 11 having the above-mentioned structure can be folded by rotating the components relative to each other. Specifically, the second link member L2 is temporarily lifted upward and backward using the handle 30 disposed at the rear push position, and then the handle 30 is pressed downward to rotate the fourth link member L4 in the clockwise direction in FIG. 2 relative to the rear leg 16. With this operation, the first link member L1 and the third link member L3 rotate in the clockwise direction in FIG. 2 relative to the second link member L2. By such an operation, the second link member L2 and the front leg 14 approach each other while maintaining a substantially parallel configuration when viewed from the side, and the position of the handle 30 relative to the main body frame 12 is lowered. As described above, the stroller body 11 can be folded as shown in FIG. 4 . 4, the dimensions of the stroller 10 in the front-rear direction and the up-down direction can be reduced. On the other hand, in order to unfold the stroller body 11 from the folded state, it is only necessary to follow the steps opposite to the above-mentioned folding operation.

It should be noted that the stroller body 11 has a state maintaining mechanism (not shown) for limiting the relative rotation of two components. By operating the state maintaining mechanism, the stroller body 11 can be folded. In the illustrated example, the handle 30 has a remote operating device 38 connected to the state maintaining mechanism. As shown in FIG. 1 , the remote operating device 38 is provided in the middle portion 33 of the handle body 31. By operating the remote operating device 38, the state maintaining mechanism can be operated, thereby enabling the stroller body 11 to be folded.

(Seat support unit) The seat support unit 40 supports a seat cushion (not shown) on which an infant sits. As shown in FIG1 , the seat support unit 40 includes a seat support body 41 and a back support body 45. The seat support body 41 is opposite to the buttocks of an infant riding in the stroller 10. The back support body 45 is opposite to the back of the infant. As shown in FIG1 , the seat support unit 40 is arranged on the inner side of the width direction of the main frame 12. More specifically, the seat support unit 40 is arranged between the left and right front legs 14 and the rear legs 16.

The seat support body 41 has a front frame member 42. The front frame member 42 is a frame member formed in a substantially U-shape. The seat support body 41 includes a fabric (not shown) which is stretched on the front frame member 42 and constitutes a seat surface. Alternatively, the seat support body 41 includes a seat plate (not shown) which is supported from below by the front frame member 42 and constitutes a seat surface. The seat plate is a plate-shaped member formed using resin and/or metal. It should be noted that when the seat support body 41 includes a seat plate, the seat support body 41 may not include the front frame member 42.

In the illustrated example, the seat support 41 is held by the third link member L3. Accordingly, when the stroller body 11 is folded, the seat support 41 can be rotated along with the rotation of the third link member L3. When the stroller body 11 is folded, the angle of the seat support 41 relative to the second link member L2 can be automatically reduced, thereby reducing the front-rear dimension of the stroller 10 in the folded state. In other words, when the stroller 10 in the folded state is viewed from the side, the seat support 41 can be prevented from protruding further forward than the main body frame 12.

The back support body 45 has a rear frame member 46. The rear frame member 46 is a frame member formed in a roughly U-shape. In the illustrated example, the back support body 45 is connected to the seat support body 41. More specifically, the rear frame member 46 extends upward or backward from the rear end portion of the front frame member 42. The front end portion of the rear frame member 46 is rotatably connected to the rear end portion of the front frame member 42 around a rotation axis extending in the width direction. The rotation axis passes through a connecting portion A (hereinafter also referred to as "back seat connecting portion A") between the back support body 45 and the seat support body 41. By rotating the back support body 45 relative to the seat support body 41, the back support body 45 can be tilted relative to the seat support body 41. The back support body 45 can also have a cloth-like member or a plate-like member supported by the rear frame member 46.

The back support body 45 is supported from the rear by a tilting belt 49 connected to the main body frame 12 at both ends. This prevents the back support body 45 from tilting backward. The length of the tilting belt 49 is variable. By adjusting the length of the tilting belt 49, the back support body 45 can be tilted. It should be noted that the tilting belt 49 is only shown in Figures 2 and 3. In Figures 1 and 4, the illustration of the tilting belt 49 is omitted.

In the example shown in the figure, both ends of the tilting belt 49 are connected to the first link member L1. The tilting belt 49 is arranged at the back side of the back support body 45 at its central part, and is connected to the first link member L1 at both ends, so that when the main frame 12 is folded, the back support body 45 can be rotated relative to the second link member L2 along with the rotation of the first link member L1. When the baby carriage 10 is folded, the angle of the back support body 45 relative to the second link member L2 can be automatically reduced, and the dimension of the baby carriage 10 in the folded state in the front and rear direction can be reduced. In other words, in a side view of the stroller 10 in the folded state, the back support 45 can be prevented from protruding further rearward than the second link member L2.

The seat support unit 40 has a pair of side support portions 50 and a side frame member 51 extending in the vertical direction. The side support portion 50 extends upward from the front frame member 42. The side frame member 51 is a frame member formed in a substantially U-shape. The side frame member 51 is connected to the upper end of the side support portion 50 at both ends of the U-shape. The side frame member 51 is connected to the side support portion 50 so as to be rotatable around a rotation axis parallel to the width direction.

A connecting frame member 52 is provided between the middle portion of the side frame member 51 and the middle portion of the rear frame member 46. The connecting frame member 52 can rotate relative to the rear frame member 46 and the side frame member 51. The connecting frame member 52 swings along with the swing of one of the rear frame member 46 and the side frame member 51. In addition, the connecting frame member 52 is formed between the rear portion of the rear frame member 46 and the rear portion of the side frame member 51, and forms a wall portion located behind the head of an infant when the back support body 45 is laid flat, and forms a wall portion located behind the head of an infant when the back support body 45 is erected.

In addition, the seat support unit 40 has a pair of protection component supports 54 connected to the left and right sides of the seat support body 41, and a protection component 55 extending between the pair of protection component supports 54. The left and right ends of the protection component 55 are detachably connected to the left and right protection component supports 54, respectively. In addition, the seat support unit 40 has a canopy support body 57 that supports a canopy cloth (not shown). The canopy support body 57 includes: a pair of canopy support members 58 respectively fixed to the two end portions of the side frame member 51, and a canopy frame 59 extending between the pair of canopy support members 58. A canopy cloth is mounted on the canopy frame 59 to form a canopy. The canopy covers the infant sitting on the seat support unit 40 from above to provide a sunshade environment for the infant.

(Front leg and rear leg) In the illustrated example, the front leg 14 has a front leg main part 14a connected to the first link part L1 and a front wheel holding part 14b connected to the front leg main part 14a. The front leg main part 14a is connected to the first link part L1 at its upper end. The front leg main part 14a can be formed using a metal and/or resin pipe, for example. The front wheel holding part 14b is formed as an extension of the front leg main part 14a. The front wheel holding part 14b is connected to the lower end of the front leg main part 14a. The front wheel holding part 14b is connected to the front leg main part 14a at its upper end. The front wheel holding part 14b holds the front wheel rotation axis holding part 18c at its lower end.

In addition, in the illustrated example, the hind leg 16 has a hind leg main component 16a connected to the first link component L1 and a rear wheel holding component 16b connected to the hind leg main component 16a. The hind leg main component 16a is connected to the first link component L1 at its upper end. The hind leg main component 16a can be formed using, for example, a metal and/or resin pipe. The rear wheel holding component 16b is formed as an extension of the hind leg main component 16a. The rear wheel holding component 16b is connected to the lower end of the hind leg main component 16a. The rear wheel holding component 16b is connected to the hind leg main component 16a at its upper end. The rear wheel holding component 16b holds the rear wheel rotating shaft holding component 19c at its lower end.

In addition, the baby carriage 10 of the present embodiment has been studied to improve the operability of the baby carriage 10 in both cases of placing the handle 30 in the back push position and placing the handle 30 in the face-to-face push position. Specifically, the front wheel rotation shaft holding member 18c can move in the front-to-back direction relative to the front leg 14. In addition, the rear wheel rotation shaft holding member 19c can move in the front-to-back direction relative to the rear leg 16.

Here, when the operator of the stroller 10 places the handle 30 in the back-pushing position to operate the stroller 10, the stroller 10 is operated with the rear wheel rotation shaft 19b as a fulcrum. On the other hand, when the operator of the stroller 10 places the handle 30 in the face-to-face pushing position to operate the stroller 10, the stroller 10 is operated with the front wheel rotation shaft 18b as a fulcrum. The shorter the distance in the front-to-back direction between the above-mentioned fulcrum and the center of gravity of the infant on the seat support unit 40, the higher the operability of the stroller 10. The position of the center of gravity of the infant in the main frame 12 in the front-to-back direction is roughly consistent with the position of the back seat connection part A in the main frame 12 in the front-to-back direction. Therefore, the shorter the distance in the front-to-back direction between the above-mentioned fulcrum and the back seat connection part A, the higher the operability of the stroller 10.

However, if the distance in the front-rear direction between the rear wheel rotating shaft 19b and the back seat connecting portion A is shortened, the operability of the stroller 10 when the handle 30 is arranged in the back push position can be improved, but the operability of the stroller 10 when the handle 30 is arranged in the face-to-face push position is impaired. On the other hand, if the distance in the front-rear direction between the front wheel rotating shaft 18b and the back seat connecting portion A is shortened, the operability of the stroller 10 when the handle 30 is arranged in the face-to-face push position can be improved, but the operability of the stroller 10 when the handle 30 is arranged in the back push position is impaired.

In the present embodiment, by moving the front wheel rotation shaft retaining member 18c and the rear wheel rotation shaft retaining member 19c (therefore, the front wheel rotation shaft 18b and the rear wheel rotation shaft 19b) in the front-rear direction relative to the front legs 14 and the rear legs 16 (therefore, relative to the back seat connection part A), the stroller 10 can be well operated regardless of whether the handle 30 is configured in the back pushing position or the face-to-face pushing position.

In the illustrated example, when the handle 30 is arranged in the back-pushing position shown in FIG. 2 , the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c are arranged in the first position. At this time, the distance between the rear wheel rotation shaft 19b and the back seat connecting portion A in the front-back direction is set to D1, and the distance between the front wheel rotation shaft 18b and the back seat connecting portion A in the front-back direction is set to D2. In the illustrated example, the distance D1 is shorter than the distance D2. Therefore, when the handle 30 is arranged in the face-to-face pushing position shown in FIG. 3 , the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c are arranged in the second position further rearward than the first position. In this case, the distance between the front wheel rotation axis 18b and the back seat connection part A in the front-rear direction is set to D3. Since the second position is further rearward than the first position, the distance D3 is shorter than the distance D2. Therefore, compared with the known baby stroller in which the front wheel rotation axis retaining component 18c and the rear wheel rotation axis retaining component 19c cannot move relative to the front legs 14 and the rear legs 16, the operability of the baby stroller 10 is improved when the handle 30 is arranged in the face-to-face pushing position. In addition, since the distance D1 is shorter than the distance D2, the operability of the baby stroller 10 is also good when the handle 30 is arranged in the back pushing position. In FIG. 3, the front wheel rotation axis retaining component 18c and the rear wheel rotation axis retaining component 19c in the first position are shown by double-point lines.

Furthermore, by moving not only the front wheel 18 relative to the front leg 14 but also the rear wheel 19 relative to the rear leg 16, the change in the distance between the front wheel 18 and the rear wheel 19 in the front-rear direction is suppressed. Therefore, even if the front wheel 18 is moved, the possibility of the stability of the stroller 10 being impaired can be suppressed. In the example shown in the figure, the moving distance of the front wheel rotating shaft holding member 18c from the first position to the second position is equal to the moving distance of the rear wheel rotating shaft holding member 19c from the first position to the second position.

In the illustrated example, the front wheel rotating shaft retaining component 18c is connected to the lower end of the front wheel retaining component 14b. The lower end of the front wheel retaining component 14b extends further rearward than the lower end of the front leg main component 14a. The lower end of the front wheel retaining component 14b retains the front wheel rotating shaft retaining component 18c so as to be movable in the front-rear direction. The front wheel rotating shaft retaining component 18c is movable between a first position (refer to FIG. 2) and a second position (refer to FIG. 3) that is further rearward than the first position. In the illustrated example, the front wheel retaining component 14b also retains the front wheel rotating shaft retaining component 18c in a manner that allows it to rotate around the front wheel rotating shaft 18d.

In the illustrated example, the distance D4 (see FIG. 3 ) between the first position and the second position in the front-rear direction is determined as follows: That is, the distance D4 is determined to be at least twice the distance D5 (see FIG. 3 ) which is the distance in the horizontal direction between the front wheel rotating shaft 18d and the front wheel rotating shaft 18b in a plane perpendicular to the front wheel rotating shaft 18b. Here, when the front wheel rotating shaft holding member 18c rotates around the front wheel rotating shaft 18d, as shown in Figures 2 and 3, the position of the front wheel rotating shaft 18b relative to the front wheel rotating shaft 18d changes when the handle 30 is arranged in the back push position to operate the baby carriage 10 and when the handle 30 is arranged in the face-to-face push position to operate the baby carriage 10. In the example shown in the figure, when the handle 30 is arranged in the back push position to operate the baby carriage 10, the front wheel rotating shaft 18b is located at the position of the distance D5 behind the front wheel rotating shaft 18d. On the other hand, when the handle 30 is arranged in the face-to-face pushing position to operate the stroller 10, the front wheel rotating shaft 18b is located at the distance D5 in front of the front wheel rotating shaft 18d. Therefore, when the handle 30 is moved from the back pushing position to the face-to-face pushing position, even if the front wheel rotating shaft holding member 18c is moved by the distance D4, the moving distance of the front wheel rotating shaft 18b becomes D4-2×D5. Therefore, by setting the distance D4 to more than twice the distance D5, the distance D3 (see FIG. 3) can be set to less than the distance D2 (see FIG. 2), and the deterioration of the operability of the stroller 10 due to the rotation of the front wheel 18 can be suppressed.

More preferably, the distance D4 is greater than twice the distance D5. Accordingly, by making the distance D3 (see FIG. 3 ) smaller than the distance D2 (see FIG. 2 ), the operability of the stroller 10 can be improved when the handle 30 is arranged in the face-to-face pushing position.

It should be noted that the distance D4 is measured as the distance between the rotation axis of the front wheel rotation axis retaining component 18c arranged at the first position and the rotation axis of the front wheel rotation axis retaining component 18d arranged at the second position. Alternatively, the distance D4 is measured as the distance between the rotation axis of the rear wheel rotation axis retaining component 19c arranged at the first position and the rotation axis of the rear wheel rotation axis retaining component 19c arranged at the second position. In addition, the distance D5 is measured as the distance in the horizontal direction between the rotation axis of the front wheel rotation axis retaining component 18c and the rotation axis of the front wheel 18. The rotation axis of the front wheel rotation axis retaining component 18c coincides with the center axis of the front wheel rotation axis 18d. The rotation axis of the rear wheel rotation axis holding member 19c coincides with the center axis of the rear wheel rotation axis 19d. The rotation axis of the front wheel 18 coincides with the center axis of the front wheel rotation axis 18b.

In the illustrated example, the stroller body 11 includes a linkage mechanism 70, and the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c are moved in conjunction with the swing of the handle 30. The linkage mechanism 70 will be described below.

(Linkage mechanism) The linkage mechanism 70 moves the front wheel rotation shaft retaining member 18c in the front-rear direction relative to the front leg 14 and the rear wheel rotation shaft retaining member 19c in the front-rear direction relative to the rear leg 16 according to the swing of the handle 30. If the handle 30 is arranged in the back push position, the linkage mechanism 70 positions the front wheel rotation shaft retaining member 18c and the rear wheel rotation shaft retaining member 19c in the first position, and if the handle 30 is arranged in the face-to-face push position, the linkage mechanism 70 positions the front wheel rotation shaft retaining member 18c and the rear wheel rotation shaft retaining member 19c in the second position. When the stroller body 11 has the linkage mechanism 70, by swinging the handle 30, the front wheel rotation shaft holding member 18c can automatically change the position in the front and rear direction relative to the front leg 14, and the rear wheel rotation shaft holding member 19c can automatically change the position in the front and rear direction relative to the rear leg 16.

In the illustrated example, the linkage mechanism 70 includes a traction member 71 and a force application member 72. The traction member 71 may be a soft, elongated member. The traction member 71 may be a wire, a rope, a chain, or the like. The traction member 71 connects the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c to the handle 30. If the handle 30 is placed in the back push position, the traction member 71 tractions the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c from the second position toward the first position. The force application member 72 applies force to the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c from the first position toward the second position. It should be noted that, when the handle 30 is swung to the face-to-face pushing position, the traction member 71 is relaxed and no traction force is applied to the front wheel pivot holding member 18c and the rear wheel pivot holding member 19c.

In the stroller 10 having such a linkage mechanism 70, when the handle 30 is arranged in the back-pushing position, the front wheel swivel shaft holding member 18c and the rear wheel swivel shaft holding member 19c are arranged in the first position due to the pulling force of the pulling member 71. Furthermore, when the handle 30 is swung from the back-pushing position to the face-to-face pushing position, the front wheel swivel shaft holding member 18c and the rear wheel swivel shaft holding member 19c are moved from the first position to the second position due to the force of the force applying member 72. While the handle 30 is arranged in the face-to-face pushing position, the front wheel swivel shaft holding member 18c and the rear wheel swivel shaft holding member 19c are kept in the second position due to the force of the force applying member 72. When the handle 30 is swung from the face-to-face pushing position to the rear pushing position, the front wheel pivot holding member 18c and the rear wheel pivot holding member 19c are moved from the second position to the first position by the traction force of the traction member 71.

Of course, if the handle 30 is placed in the face-to-face pushing position, the traction member 71 can also traction the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c from the first position to the second position. In this case, the force applying member 72 can apply force to the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c from the second position to the first position. In such a linkage mechanism 70, when the handle 30 is placed in the back pushing position, the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c are placed in the first position due to the force of the force applying member 72. Furthermore, if the handle 30 is swung from the rear push position to the face-to-face push position, the front wheel axle holding member 18c and the rear wheel axle holding member 19c move from the first position to the second position due to the traction force of the traction member 71. While the handle 30 is disposed in the face-to-face push position, the front wheel axle holding member 18c and the rear wheel axle holding member 19c stay in the second position due to the traction force of the traction member 71. When the handle 30 is swung from the face-to-face push position to the rear push position, the front wheel axle holding member 18c and the rear wheel axle holding member 19c move from the second position to the first position due to the urging force of the urging member 72.

<<Modifications of the first embodiment>> Next, various modifications of the first embodiment will be described.

<Variation 1-1> In the above example, the stroller body 11 includes the linkage mechanism 70, and the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c are linked with the swing of the handle 30 through the linkage mechanism 70 to move, but it is not limited to this. The front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c can also be manually moved relative to the front leg 14 and the rear leg 16.

＜Variation 1-2＞

In the above example, the front wheel rotating shaft holding member 18c and the rear wheel rotating shaft holding member 19c are held in the first position or the second position by the linkage mechanism 70, but the present invention is not limited thereto. The front wheel rotating shaft holding member 18c and the rear wheel rotating shaft holding member 19c may also be held in the first position or the second position by the locking member 75. The locking member 75 may fix the front wheel rotating shaft holding member 18c and the rear wheel rotating shaft holding member 19c relative to the front leg 14 and the rear leg 16, respectively.

In the example shown in FIG. 5 , the locking member 75 is mounted on the front wheel holding member 14b and the rear wheel holding member 16b. The locking member 75 can move in the up-down direction relative to the front wheel holding member 14b and the rear wheel holding member 16b. The locking member 75 can move between the locking position shown in FIG. 5 and the lock release position which is higher than the locking position. When in the locking position shown in FIG. 5 , the locking member 75 interferes with the front wheel rotating shaft holding member 18c and the rear wheel rotating shaft holding member 19c and restricts their movement in the front-rear direction. Therefore, the front wheel rotating shaft holding member 18c and the rear wheel rotating shaft holding member 19c are held in the first position or the second position. When in the unlocked position, the lock member 75 does not interfere with the front wheel axle holding member 18c and the rear wheel axle holding member 19c, and allows the front and rear directions to move. Therefore, the front wheel axle holding member 18c and the rear wheel axle holding member 19c can move between the first position and the second position.

＜Variation 1-3＞

In the above example, the front wheel rotating shaft holding member 18c can rotate around the front wheel rotating shaft 18d, and the rear wheel rotating shaft holding member 19c can rotate around the rear wheel rotating shaft 19d, but the present invention is not limited to this. The front wheel rotating shaft holding member 18c and the rear wheel rotating shaft holding member 19c may not be rotatable. In other words, the front wheel rotating shaft holding member 18c and the front wheel 18, and the rear wheel rotating shaft holding member 19c and the rear wheel 19 may not constitute casters.

＜Variation 1-4＞

In the above example, the front wheel rotating shaft 18b is held by the front wheel rotating shaft holding member 18c, and the rear wheel rotating shaft 19b is held by the rear wheel rotating shaft holding member 19c, but the present invention is not limited thereto. The front wheel rotating shaft 18b may be directly held by the front leg 14, and the rear wheel rotating shaft 19b may be directly held by the rear leg 16. For example, the front wheel holding member 14b may hold the front wheel rotating shaft 18b so that it can move in the front-rear direction, and the rear wheel holding member 16b may hold the rear wheel rotating shaft 19b so that it can move in the front-rear direction.

＜＜Second implementation method＞＞

Next, a baby stroller 110 according to a second embodiment will be described with reference to Fig. 6 and Fig. 7. Fig. 6 corresponds to Fig. 2, and Fig. 7 corresponds to Fig. 3. Fig. 6 and Fig. 7 are side views of the baby stroller 110 according to the second embodiment.

In the example shown in Figs. 6 and 7, the difference from the stroller 10 shown in Figs. 1 to 4 is that the lower part of the front leg 14 can rotate relative to the upper part of the front leg 14, and the lower part of the rear leg 16 can rotate relative to the upper part of the rear leg 16. In addition, the front wheel rotation shaft holding member 18c is not movable in the front-back direction relative to the lower part of the front leg 14, and the rear wheel rotation shaft holding member 19c is not movable in the front-back direction relative to the lower part of the rear leg 16. The other structures are substantially the same as those of the stroller 10 shown in Figs. 1 to 4. In the example shown in Figs. 6 and 7, the same symbols are attached to the same parts as those of the first embodiment shown in Figs. 1 to 4, and detailed descriptions are omitted.

(front and hind legs)

The front leg 14 includes a front leg upper member 141 forming the upper portion of the front leg 14 and a front leg lower member 142 forming the lower portion of the front leg 14. The upper end portion of the front leg upper member 141 is connected to the front portion of the first link member L1 in a rotatable manner. The upper end portion of the front leg lower member 142 is connected to the lower end portion of the front leg upper member 141. The front leg lower member 142 can rotate relative to the front leg upper member 141 around the front leg rotation axis X14 along the lead-vertical direction. The front wheel rotation shaft retaining member 18c is connected to the lower end portion of the front leg lower member 142. The front wheel rotation shaft retaining member 18c and the front wheel 18 may not constitute casters. In other words, the front wheel rotation shaft retaining member 18c may not be rotatable relative to the front leg lower member 142.

The rear leg 16 includes a rear leg upper member 161 forming the upper portion of the rear leg 16 and a rear leg lower member 162 forming the lower portion of the rear leg 16. The upper end portion of the rear leg upper member 161 is connected to the front portion of the first link member L1 in a rotatable manner. The upper end portion of the rear leg lower member 162 is connected to the lower end portion of the rear leg upper member 161. The rear leg lower member 162 can rotate relative to the rear leg upper member 161 around the rear leg rotation axis X16 along the lead-vertical direction. The rear wheel rotation shaft retaining member 19c is connected to the lower end portion of the rear leg lower member 162. The rear wheel rotation shaft retaining member 19c and the rear wheel 19 may not constitute casters. In other words, the rear wheel rotation shaft retaining member 19c may not be rotatable relative to the rear leg lower member 162.

In the example shown in the figure, by rotating the front leg lower member 142 relative to the front leg upper member 141 and rotating the rear leg lower member 162 relative to the rear leg upper member 161, the front wheel 18 and the rear wheel 19 (therefore, the front wheel rotating shaft 18b and the rear wheel rotating shaft 19b) can be moved in the front-rear direction relative to the back seat connection portion A. Accordingly, the stroller 10 can be well operated regardless of whether the handle 30 is arranged in the back push position or the face-to-face push position.

Specifically, the front leg upper member 141 and the front leg lower member 142 are connected via the front leg connecting member 143. The front leg connecting member 143 can rotate around the front leg rotation axis X14 relative to the front leg upper member 141. The front leg rotation axis X14 passes through the lower end of the front leg upper member 141. The front leg lower member 142 is fixed to the front leg connecting member 143. The connection position between the front leg connecting member 143 and the front leg lower member 142 is radially offset from the connection position between the front leg connecting member 143 and the front leg upper member 141 to a circle centered on the front leg rotation axis X14. Therefore, if the front leg lower member 142 is rotated relative to the front leg upper member 141, the front-rear position of the front wheel 18 mounted on the front leg lower member 142 changes. In addition, the front leg lower member 142 is tilted relative to the vertical direction. Therefore, the front-rear position of the front wheel 18 also changes according to the rotation of the front leg lower member 142 relative to the front leg upper member 141.

In addition, the rear leg upper member 161 and the rear leg lower member 162 are connected via the rear leg connecting member 163. The rear leg connecting member 163 can rotate around the rear leg rotation axis X16 relative to the rear leg upper member 161. The rear leg rotation axis X16 passes through the lower end of the rear leg upper member 161. The rear leg lower member 162 is fixed to the rear leg connecting member 163. The connection position between the rear leg connecting member 163 and the rear leg lower member 162 is radially offset from the connection position between the rear leg connecting member 163 and the rear leg upper member 161 to the circle with the rear leg rotation axis X16 as the center. Therefore, if the rear leg lower member 162 is rotated relative to the rear leg upper member 161, the front-back position of the rear wheel 19 mounted on the rear leg lower member 162 changes. In addition, the rear leg lower member 162 is tilted relative to the vertical direction. Therefore, the front-back position of the rear wheel 19 also changes according to the rotation of the rear leg lower member 162 relative to the rear leg upper member 161.

In the illustrated example, when the handle 30 is arranged in the back push position shown in FIG6, the front wheel 18 and the rear wheel 19 are arranged in the third position. In addition, when the handle 30 is arranged in the face-to-face push position shown in FIG7, the front wheel 18 and the rear wheel 19 are arranged in the fourth position which is further rearward than the third position. Since the fourth position is located further rearward than the third position, the distance D7 (see FIG7) in the front-to-back direction between the front wheel rotation axis 18b and the back seat connection part A when the handle 30 is arranged in the face-to-face push position is shorter than the distance D6 (see FIG6) in the front-to-back direction between the front wheel rotation axis 18b and the back seat connection part A when the handle 30 is arranged in the back push position.

Hereinafter, the position of the front leg lower member 142 and the rear leg lower member 162 when the front wheel 18 and the rear wheel 19 are arranged in the third position shown in Fig. 6 is referred to as the fifth position. In addition, the position of the front leg lower member 142 and the rear leg lower member 162 when the front wheel 18 and the rear wheel 19 are arranged in the fourth position shown in Fig. 7 is referred to as the sixth position.

In the illustrated example, as shown in Fig. 6, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the fifth position, the upper end portions of the front leg lower member 142 and the rear leg lower member 162 are located in front of the lower end portions of the front leg upper member 141 and the rear leg upper member 161. In addition, as shown in Fig. 7, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the sixth position, the upper end portions of the front leg lower member 142 and the rear leg lower member 162 are located behind the lower end portions of the front leg upper member 141 and the rear leg upper member 161.

In the illustrated example, as shown in Fig. 6, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the fifth position, the front leg lower member 142 and the rear leg lower member 162 are inclined with respect to the lead vertical direction in a manner of facing forward and facing downward. In addition, as shown in Fig. 7, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the sixth position, the front leg lower member 142 and the rear leg lower member 162 are inclined with respect to the lead vertical direction in a manner of facing backward and facing downward.

In the illustrated example, the stroller body 111 of the stroller 110 includes a linkage mechanism 170, and the rotation of the front leg lower member 142 and the rear leg lower member 162 is linked to the swing of the handle 30 by the linkage mechanism 170. The linkage mechanism 170 will be described below.

(Linkage mechanism)

The linkage mechanism 170 rotates the front leg lower member 142 relative to the front leg upper member 141 and rotates the rear leg lower member 162 relative to the rear leg upper member 161 according to the swinging of the handle 30. If the handle 30 is arranged in the back pushing position, the linkage mechanism 170 positions the front leg lower member 142 and the rear leg lower member 162 in the fifth position, and if the handle 30 is arranged in the face-to-face pushing position, the linkage mechanism 170 positions the front leg lower member 142 and the rear leg lower member 162 in the sixth position. When the stroller body 111 has the linkage mechanism 170, by swinging the handle 30, the front and rear wheels 18 and the rear wheels 19 can be automatically changed in the front-rear direction relative to the back seat connection part A.

In the illustrated example, the linkage mechanism 170 includes a traction member 171 and a force member 172. The traction member 171 may be a flexible, elongated member. The traction member 171 may be a line, a rope, a chain, or the like. The force member 172 applies force to the front leg lower member 142 in the circumferential direction of a circle centered on the front leg rotation axis X14. In addition, the force member 172 applies force to the rear leg lower member 162 in the circumferential direction of a circle centered on the rear leg rotation axis X16. The force member 172 may be, for example, a torsion spring. In this case, one end of the force member 172 of the front leg 14 may be fixed to the front leg upper member 141, and the other end may be fixed to the front leg lower member 142. In addition, one end of the force applying member 172 of the rear leg 16 may be fixed to the rear leg upper member 161, and the other end may be fixed to the rear leg lower member 162. The pulling member 171 connects the front leg lower member 142 and the rear leg lower member 162 to the handle 30. If the handle 30 is swung to the back pushing position, the pulling member 171 pulls the front leg lower member 142 along the circumferential direction of the circle with the front leg rotation axis X14 as the center. In addition, if the handle 30 is swung to the back pushing position, the pulling member 171 pulls the rear leg lower member 162 along the circumferential direction of the circle with the rear leg rotation axis X16 as the center. The direction in which the pulling member 171 pulls the front leg lower member 142 and the rear leg lower member 162 is opposite to the direction in which the force applying member 172 applies force to the front leg lower member 142 and the rear leg lower member 162. It should be noted that if the swing of the handle 30 is arranged in the face-to-face pushing position, the pulling member 171 is relaxed and does not apply pulling force to the front leg lower member 142 and the rear leg lower member 162.

In such a linkage mechanism 170, when the handle 30 is placed in the back-pushing position, the front leg lower member 142 and the rear leg lower member 162 are placed in the fifth position due to the pulling force of the pulling member 171. Furthermore, when the handle 30 is swung from the back-pushing position to the face-to-face pushing position, the front leg lower member 142 and the rear leg lower member 162 are rotated from the fifth position to the sixth position due to the force of the force applying member 172. Accordingly, the front wheel 18 and the rear wheel 19 move from the third position to the fourth position. While the handle 30 is placed in the face-to-face pushing position, the front leg lower member 142 and the rear leg lower member 162 are kept in the sixth position due to the force of the force applying member 172. When the handle 30 is swung from the face-to-face pushing position to the back pushing position, the front leg lower member 142 and the rear leg lower member 162 rotate from the sixth position to the fifth position due to the traction force of the traction member 171. Accordingly, the front wheel 18 and the rear wheel 19 move from the fourth position to the third position.

Of course, if the handle 30 is placed in the face-to-face pushing position, the pulling member 171 may pull the front leg lower member 142 in the circumferential direction of a circle with the front leg rotation axis X14 as the center, and pull the rear leg lower member 162 in the circumferential direction of a circle with the rear leg rotation axis X16 as the center. In this case, if the handle 30 is placed in the back pushing position, the pulling member 171 may be relaxed and not apply pulling force to the front leg lower member 142 and the rear leg lower member 162. In such a linkage mechanism 170, when the handle 30 is placed in the back pushing position, the front leg lower member 142 and the rear leg lower member 162 are placed in the fifth position due to the force of the force applying member 172. Furthermore, when the handle 30 is moved from the rear pushing position to the face-to-face pushing position, the front leg lower member 142 and the rear leg lower member 162 rotate from the fifth position to the sixth position due to the pulling force of the pulling member 171. While the handle 30 is arranged in the face-to-face pushing position, the front leg lower member 142 and the rear leg lower member 162 are retained in the sixth position due to the pulling force of the pulling member 171. When the handle 30 is moved from the face-to-face pushing position to the rear pushing position, the front leg lower member 142 and the rear leg lower member 162 rotate from the sixth position to the fifth position due to the force of the force applying member 172.

It should be noted that in the second embodiment, the front connecting member 15 is disposed between the front leg upper members 141. Accordingly, the front leg lower member 142 can rotate relative to the front leg upper member 141. In addition, the rear connecting member 17 is disposed between the rear leg upper members 161. Accordingly, the rear leg lower member 162 can rotate relative to the rear leg upper member 161.

<<Modification of the second embodiment>>

Next, various modifications of the second embodiment are described.

<Variation 2-1>

In the above example, the stroller body 111 includes the linkage mechanism 170, and the front leg lower member 142 and the rear leg lower member 162 are linked to the swing of the handle 30 through the linkage mechanism 170 to rotate, but the present invention is not limited thereto. The front leg lower member 142 and the rear leg lower member 162 can be manually rotated relative to the front leg upper member 141 and the rear leg upper member 161.

＜Variation 2-2＞

In the above example, the front leg lower member 142 and the rear leg lower member 162 are held at the fifth position or the sixth position by the linkage mechanism 170, but the present invention is not limited thereto. The front leg lower member 142 and the rear leg lower member 162 may be held at the fifth position or the sixth position by a locking member. The locking member may fix the front leg upper member 141 and the front leg lower member 142 relative to the rear leg upper member 161 and the rear leg lower member 162, respectively.

The stroller 10 of the first embodiment and its modified example described above has a stroller body 11. The stroller body 11 includes a main frame 12, a handle 30, a seat support unit 40, a front wheel 18, a front wheel rotation axis retaining component 18c, a rear wheel 19, and a rear wheel rotation axis retaining component 19c. The main frame 12 includes a front leg 14 and a rear leg 16. The handle 30 is mounted on the main frame 12 in a manner that can be swung in the front and rear directions. The seat support unit 40 is retained on the main frame 12. The front wheel 18 can rotate around a front wheel rotation axis 18b extending in the horizontal direction. The front wheel rotation axis retaining component 18c is connected to the front leg 14 to retain the front wheel rotation axis 18b. The rear wheel 19 can rotate around a rear wheel rotating shaft 19b extending in the horizontal direction. The rear wheel rotating shaft retaining component 19c is connected to the rear leg 16 to retain the rear wheel rotating shaft 19b. The front wheel rotating shaft retaining component 18c can move in the front-back direction relative to the front leg 14. The rear wheel rotating shaft retaining component 19c can move in the front-back direction relative to the rear leg 16. According to such a baby stroller 10, the distance in the front-back direction between the center of gravity of the infant riding in the baby stroller 10 and the front wheel rotating shaft 18b can be changed. Therefore, the operability of the baby stroller 10 when the handle 30 is arranged in the face-to-face pushing position can be improved. In addition, the rear wheels 19 can be moved relative to the main frame 12 in coordination with the movement of the front wheels 18 relative to the main frame 12. Therefore, even if the front wheels 18 are moved relative to the main frame 12, the change in the distance between the front wheels 18 and the rear wheels 19 can be suppressed, thereby suppressing the possibility of the stability of the stroller 10 being impaired.

In the first embodiment and its modified example described above, the stroller body 11 includes the linkage mechanism 70. The linkage mechanism 70 moves the front wheel rotation shaft holding member 18c in the front-back direction relative to the front leg 14 and moves the rear wheel rotation shaft holding member 19c in the front-back direction relative to the rear leg 16 according to the swing of the handle 30. According to such a stroller 10, the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c can be automatically moved according to the swing of the handle 30.

In the first embodiment and its variants described above, the handle 30 can be swung in the front-to-back direction between the back-pushing position and the face-to-face pushing position. The front wheel rotation axis retaining component 18c and the rear wheel rotation axis retaining component 19c are positioned at the first position when the handle 30 is in the back-pushing position. In addition, the front wheel rotation axis retaining component 18c and the rear wheel rotation axis retaining component 19c are positioned at the second position further rearward than the first position when the handle 30 is in the face-to-face pushing position. According to such a baby stroller 10, the distance in the front-to-back direction between the front wheel rotation axis 18b and the above-mentioned infant when the handle 30 is arranged in the face-to-face pushing position can be made smaller than the distance in the front-to-back direction between the front wheel rotation axis 18b and the above-mentioned infant when the handle 30 is arranged in the back-pushing position. As a result, the operability of the stroller 10 can be improved when the handle 30 is arranged in the face-to-face pushing position.

In the first embodiment and its variant described above, the front wheel pivot shaft retaining member 18c can rotate around the front wheel pivot shaft 18d extending in the vertical direction. The distance D4 in the front-rear direction between the first position and the second position is more than twice the distance D5 in the horizontal direction between the front wheel pivot shaft 18d and the front wheel pivot shaft 18b in a plane perpendicular to the front wheel pivot shaft 18b. According to such a stroller 10, the change in the front-rear direction distance between the front wheel pivot shaft 18b and the center of gravity of the infant on the stroller 10 caused by the rotation of the front wheel 18 can be eliminated. Accordingly, the change in the operability of the stroller 10 caused by the rotation of the front wheel 18 can be suppressed.

In the modification of the first embodiment described above, the stroller body 11 includes a locking member 75. The locking member 75 can fix the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c relative to the front leg 14 and the rear leg 16, respectively. According to such a stroller 10, the possibility of the front wheel rotation shaft holding member 18c and the rear wheel rotation shaft holding member 19c accidentally moving relative to the front leg 14 and the rear leg 16 can be suppressed.

The stroller 10 of the variation of the first embodiment described above has a stroller body 11. The stroller body 11 includes a main frame 12, a handle 30, a seat support unit 40, a front wheel 18, and a rear wheel 19. The main frame 12 includes a front leg 14 and a rear leg 16. The handle 30 is mounted on the main frame 12 in a manner that allows it to swing in the front-rear direction. The seat support unit 40 is retained on the main frame 12. The front wheel 18 can rotate around a front wheel rotating shaft 18b extending in the horizontal direction. The rear wheel 19 can rotate around a rear wheel rotating shaft 19b extending in the horizontal direction. The front leg 14 holds the front wheel rotating shaft 18b so that it can move in the front-rear direction. The rear leg 16 holds the rear wheel rotating shaft 19b so that it can move in the front-rear direction. According to such a stroller 10, the distance in the front-rear direction between the center of gravity of the infant riding in the stroller 10 and the front wheel rotation axis 18b can be changed. Therefore, the operability of the stroller 10 when the handle 30 is arranged in the face-to-face pushing position can be improved. In addition, the rear wheel 19 can be moved relative to the main frame 12 in coordination with the movement of the front wheel 18 relative to the main frame 12. Therefore, even if the front wheel 18 is moved relative to the main frame 12, the change in the distance between the front wheel 18 and the rear wheel 19 can be suppressed, thereby suppressing the possibility of the stability of the stroller 10 being impaired.

The stroller 110 of the second embodiment and its modified example described above has a stroller body 111. The stroller body 111 includes a main frame 12, a handle 30, a seat support unit 40, a front wheel 18 and a rear wheel 19. The main frame 12 includes a front leg 14 and a rear leg 16. The handle 30 is mounted on the main frame 12 in a manner that can swing in the front and rear directions. The seat support unit 40 is retained on the main frame 12. The front wheel 18 is mounted on the lower part of the front leg 14. The front wheel 18 can rotate around a front wheel rotating shaft 18b extending in the horizontal direction. The rear wheel 19 is mounted on the lower part of the rear leg 16. The rear wheel 19 can rotate around a rear wheel rotating shaft 19b extending in the horizontal direction. The front leg 14 includes a front leg upper member 141 forming an upper portion of the front leg 14 and a front leg lower member 142 forming a lower portion of the front leg 14. The front leg lower member 142 can rotate relative to the front leg upper member 141 around a front leg rotation axis X14 along the plumb-vertical direction. The rear leg 16 includes a rear leg upper member 161 forming an upper portion of the rear leg 16 and a rear leg lower member 162 forming a lower portion of the rear leg 16. The rear leg lower member 162 can rotate relative to the rear leg upper member 161 around a rear leg rotation axis X16 along the plumb-vertical direction. By rotating the front leg lower member 142 relative to the front leg upper member 141, the position of the front wheel 18 in the front-rear direction relative to the seat support unit 40 is changed. By rotating the rear leg lower member 162 relative to the rear leg upper member 161, the position of the rear wheel 19 in the front-rear direction relative to the seat support unit 40 is changed. According to such a stroller 10, the distance in the front-rear direction between the center of gravity of the infant riding in the stroller 10 and the front wheel rotation axis 18b can be changed. Therefore, the operability of the stroller 10 when the handle 30 is arranged in the face-to-face pushing position can be improved. In addition, the rear wheel 19 can be moved relative to the main frame 12 in coordination with the movement of the front wheel 18 relative to the main frame 12. Therefore, even if the front wheel 18 is moved relative to the main frame 12, the distance between the front wheel 18 and the rear wheel 19 can be suppressed from changing, thereby suppressing the possibility of the stability of the stroller 10 being impaired.

In the second embodiment and its variants described above, the front leg rotation axis X14 passes through the front leg upper member 141. The front leg lower member 142 is connected to the front leg upper member 141 radially outward of a circle centered on the front leg rotation axis X14. The rear leg rotation axis X16 passes through the rear leg upper member 161. The rear leg lower member 162 is connected to the rear leg upper member 161 radially outward of a circle centered on the rear leg rotation axis X16. According to such a stroller 10, by rotating the front leg lower member 142 relative to the front leg upper member 141, the position of the front wheel 18 relative to the seat support unit 40 in the front-rear direction can be changed. In addition, by rotating the rear leg lower member 162 relative to the rear leg upper member 161, the position of the rear wheel 19 relative to the seat support unit 40 in the front-rear direction can be changed.

In the second embodiment and its modified example described above, the front leg lower member 142 and the rear leg lower member 162 are inclined relative to the vertical direction. According to such a stroller 10, by rotating the front leg lower member 142 relative to the front leg upper member 141, the position of the front wheel 18 relative to the seat support unit 40 in the front-back direction can be changed. In addition, by rotating the rear leg lower member 162 relative to the rear leg upper member 161, the position of the rear wheel 19 relative to the seat support unit 40 in the front-back direction can be changed.

In the second embodiment and its modified example described above, the stroller body 111 includes a linkage mechanism 170. The linkage mechanism 170 rotates the front leg lower member 142 relative to the front leg upper member 141 and the rear leg lower member 162 relative to the rear leg upper member 161 in accordance with the swing of the handle 30. According to such a stroller 10, the front leg lower member 142 and the rear leg lower member 162 can be automatically rotated in accordance with the swing of the handle 30.

In the second embodiment and its variants described above, the handle 30 can be swung in the front-to-back direction between the back-pushing position and the face-to-face pushing position. If the handle 30 is in the back-pushing position, the front wheel 18 and the rear wheel 19 are in the third position, and if the handle 30 is in the face-to-face pushing position, the front wheel 18 and the rear wheel 19 are in the fourth position further rearward than the third position. According to such a stroller 110, the distance in the front-to-back direction between the front wheel rotation axis 18b and the center of gravity of the infant when the handle 30 is arranged in the face-to-face pushing position can be made smaller than the distance in the front-to-back direction between the front wheel rotation axis 18b and the center of gravity of the infant when the handle 30 is arranged in the back-pushing position. As a result, the operability of the stroller 10 can be improved when the handle 30 is arranged in the face-to-face pushing position.

In the modified example of the second embodiment described above, the stroller body 111 includes a locking member. The locking member can fix the front leg lower member 142 and the rear leg lower member 162 relative to the front leg upper member 141 and the rear leg upper member 161, respectively. According to such a stroller 10, the possibility of the front leg lower member 142 and the rear leg lower member 162 being accidentally rotated can be suppressed.

It should be noted that several variations of the above implementation methods are described above, but of course, multiple variations can be appropriately combined for application.

10, 110: baby stroller 11, 111: baby stroller body 12: body frame 14: front leg 14a: front leg main part 14b: front wheel holding part 141: front leg upper component 142: front leg lower component 143: front leg connecting part 16: rear leg 16a: rear leg main part 16b: rear wheel holding part 161: rear leg upper component 162: rear leg lower component 163: rear leg connecting part 18: front wheel 18b: front wheel rotating shaft 18c: front wheel rotating shaft holding part 18d: front wheel rotating shaft 19: rear wheel 19b: rear wheel rotating shaft 19c: rear wheel rotating shaft holding part 19d: rear wheel rotation shaft 20: shaft component 21: central connection component 30: handle 31: handle body 32: handle extension 33: middle part 35: retaining body 36: first retaining component 37: second retaining component 38: remote control device 40: seat support unit 41: seat support body 42: front frame component 45: back support body 46: rear frame component 49: tilting belt 50: side support part 51: side frame component 52: connecting frame component 54: protective component support body 55: protective component 57: canopy support body 58: canopy support component 59: canopy frame 70, 170: linkage mechanism 71, 171: traction component 72, 172: force-applying component 75: locking component A: back seat connection part D1, D2, D3, D4, D5, D6, D7: distance L1: first link component L2: second link component L3: third link component L4: fourth link component X14: front leg rotation axis X16: rear leg rotation axis

FIG. 1 is a diagram for explaining a first embodiment of the present invention, and is a three-dimensional diagram for explaining the overall structure of a stroller.

FIG. 2 is a side view of the stroller of FIG. 1 , showing a state in which the handle is arranged at a rear push position.

FIG. 3 is a side view of the stroller of FIG. 1 , showing a state in which the handle is arranged in a face-to-face pushing position.

FIG. 4 is a side view showing the stroller of FIG. 1 in a folded state.

FIG. 5 is a diagram for explaining a modified example of the first embodiment, and corresponds to FIG. 2 .

FIG. 6 is a diagram for explaining a second embodiment of the present invention, and is a side view showing a stroller in a state where the handle is arranged at a rear push position.

FIG. 7 is a side view of the stroller of FIG. 6 with the handle disposed in a face-to-face pushing position.

10: Baby stroller

11: Main body of baby stroller

12: Main body framework

14: Front legs

14a: Main front leg parts

14b: Front wheel retaining parts

16: hind legs

16a: Main hind leg part

16b: Rear wheel retaining parts

18:Front wheel

18b: Front wheel swivel axis

18c: Front wheel swivel shaft retaining component

18d: front wheel drive shaft

19: Rear wheel

19b: Rear wheel swivel axle

19c: Rear wheel rotating shaft retaining component

19d: Rear wheel drive shaft

20: Shaft components

30:Handle

31: Handle body

32: Handle extension

33: Middle part

35: Maintain body

37: Second retaining component

38: Remote operation device

40: Seat support unit

41: Seat support body

42:Front frame parts

45: Back support body

46: Rear frame parts

49: inclined belt

50: Side support part

51: Side frame parts

52: Link frame component

54: Protective component support body

55: Protective parts

57: Canopy support body

58: Canopy support components

59: Canopy frame

70: linkage mechanism

71: Traction components

72: Force-applying component

A: Back seat connection

D1, D2, D5: distance

L1: First connecting rod component

L3: Third connecting rod component

Claims (12)

A baby stroller is characterized in that it has a baby stroller body, wherein the baby stroller body has: a main body frame including front legs and rear legs; a handle mounted on the main body frame in a manner that allows it to swing in the front-rear direction; a seat support unit held on the main body frame; a front wheel that can rotate around a front wheel rotation axis extending in a horizontal direction; a front wheel rotation axis retaining component connected to the front legs to retain the front wheel rotation axis; a rear wheel that can rotate around a rear wheel rotation axis extending in a horizontal direction; and a rear wheel rotation axis retaining component connected to the rear legs to retain the rear wheel rotation axis, the front wheel rotation axis retaining component can move in the front-rear direction relative to the front legs, The rear wheel rotating shaft retaining component can move in the front-rear direction relative to the rear legs. A stroller as described in claim 1, wherein the stroller body includes a linkage mechanism, and the linkage mechanism causes the front wheel rotating shaft retaining component to move in the front-rear direction relative to the front legs according to the swing of the handle, and causes the rear wheel rotating shaft retaining component to move in the front-rear direction relative to the rear legs. A baby stroller as described in claim 2, wherein the handle can be swung in the front-to-back direction between a back-pushing position and a face-to-face pushing position, When the handle is in the back-pushing position, the front wheel swivel shaft retaining component and the rear wheel swivel shaft retaining component are in a first position, and when the handle is in the face-to-face pushing position, the front wheel swivel shaft retaining component and the rear wheel swivel shaft retaining component are in a second position further rearward than the first position. A baby stroller as described in claim 3, wherein the front wheel rotating shaft retaining member can rotate around the front wheel rotating shaft extending in the vertical direction, and the distance between the first position and the second position in the front-to-back direction is more than twice the distance between the front wheel rotating shaft and the front wheel rotating shaft in the horizontal direction in a plane perpendicular to the front wheel rotating shaft. A stroller as described in claim 1, wherein the stroller body includes a locking component, and the locking component can fix the front wheel rotating shaft retaining component and the rear wheel rotating shaft retaining component relative to the front leg and the rear leg respectively. A baby stroller is characterized in that it has a baby stroller body, wherein the baby stroller body has: a body frame including front legs and rear legs; a handle mounted on the body frame in a manner that allows it to swing in the front-rear direction; a seat support unit held on the body frame; a front wheel that can rotate around a front wheel rotation axis extending in the horizontal direction; and a rear wheel that can rotate around a rear wheel rotation axis extending in the horizontal direction, the front legs holding the front wheel rotation axis so that it can move in the front-rear direction, and the rear legs holding the rear wheel rotation axis so that it can move in the front-rear direction. A baby stroller is characterized in that it has a baby stroller body, the baby stroller body having: a main body frame, which includes a front leg and a rear leg; a handle, which is mounted on the main body frame in a manner that can swing in the front-back direction; a seat support unit, which is retained on the main body frame; a front wheel, which is mounted on the lower part of the front leg and can rotate around a front wheel rotation axis extending in the horizontal direction; and a rear wheel, which is mounted on the lower part of the rear leg and can rotate around a rear wheel rotation axis extending in the horizontal direction, the front leg includes a front leg upper member constituting the upper part of the front leg and a front leg lower member constituting the lower part of the front leg, the front leg lower member can rotate relative to the front leg upper member around the front leg rotation axis along the vertical direction, The rear leg includes a rear leg upper member constituting the upper part of the rear leg and a rear leg lower member constituting the lower part of the rear leg. The rear leg lower member can rotate relative to the rear leg upper member around the rear leg rotation axis along the vertical direction. By rotating the front leg lower member relative to the front leg upper member, the position of the front wheel relative to the seat support unit in the front-rear direction is changed. By rotating the rear leg lower member relative to the rear leg upper member, the position of the rear wheel relative to the seat support unit in the front-rear direction is changed. A baby stroller as described in claim 7, wherein the front leg rotation axis passes through the front leg upper member, the front leg lower member is connected to the front leg upper member on the radially outer side of a circle centered on the front leg rotation axis, the rear leg rotation axis passes through the rear leg upper member, the rear leg lower member is connected to the rear leg upper member on the radially outer side of a circle centered on the rear leg rotation axis. A stroller as described in claim 7, wherein the front leg lower member and the rear leg lower member are inclined relative to the vertical direction. A stroller as described in claim 7, wherein the stroller body includes a linkage mechanism, and the linkage mechanism rotates the lower component of the front legs relative to the upper component of the front legs and the lower component of the rear legs relative to the upper component of the rear legs according to the swing of the handle. A baby stroller as described in claim 10, wherein the handle can be swung in the front-to-back direction between a back-pushing position and a face-to-face pushing position, when the handle is in the back-pushing position, the front wheel and the rear wheel are in a third position, and when the handle is in the face-to-face pushing position, the front wheel and the rear wheel are in a fourth position further rearward than the third position. A stroller as described in claim 7, wherein the stroller body includes a locking component, and the locking component can fix the front leg lower component and the rear leg lower component relative to the front leg upper component and the rear leg upper component respectively.