CN1003120B

CN1003120B - Baby carriage

Info

Publication number: CN1003120B
Application number: CN87103893.5A
Authority: CN
Inventors: 葛西建造
Original assignee: Aprica Kassai KK
Current assignee: Aprica Kassai KK
Priority date: 1986-06-24
Filing date: 1987-05-27
Publication date: 1989-01-25
Also published as: CN87103893A

Abstract

A baby car comprising a pair of front brackets, a pair of rear brackets movably connected to the front brackets by pivot pins, a pair of seat support bars movably connected to the rear brackets, a pair of seat supports movably connected to the seat support bars Suspension rods, a pair of push rods, the lower part of which is movably connected to the upper part of the front bracket, and through the pivot pin of the connecting part, the push rods are also movably connected to the seat suspension rods, connecting the transverse connecting parts on the left and right sides of the baby car, The component used to fix the baby seat in the open state, when the baby seat is in the folded state, the rear wheels and the front wheels are on the same plane, so that the baby seat can be erected by itself.

Description

Baby carriage

The invention relates to a baby carriage, in particular to a baby carriage with simple structure and light weight.

Currently, there are many forms of strollers on the market from which customers choose to purchase strollers that suit their hobbies and needs. The factors that determine their choice vary from person to person, but one factor in common is the light weight, simplicity and lightweight construction, which is an important factor in improving the market value of strollers.

Related to the present utility model as the prior art is a baby carriage as shown in Japanese patent publication No. 15100/1981. The baby carriage has a simple structure and is intended to achieve a great weight saving. However, one problem has not yet been solved. The pushchair is foldable and, after folding, the front and rear wheels are moved away from each other. Thus, in the collapsed condition, the stroller is substantially flat on the ground, in other words, the stroller itself cannot stand up. Therefore, the pushchair is inconvenient to carry out or store in place.

Also relevant to the present invention as the prior art is a baby carriage as shown in Japanese patent JP-A2-Sho 56-128268. The baby carriage has a pair of front brackets with front wheels at the lower parts, a pair of rear brackets with rear wheels at the lower parts, a pair of seat support rods with front parts movably connected with the rear brackets, a pair of seat support rods with lower parts movably connected with the upper ends of the front brackets through pivot pins, a pair of push rods with lower parts movably connected with the upper ends of the front brackets through pivot pins, lateral connecting devices for connecting the front and rear brackets, the seat support rods and the push rods on the left and right sides of the baby carriage, and an open state locking device for maintaining the open state of the baby carriage.

The baby carriage can be folded and sent, but the folded state is still not compact enough, and the operation is also relatively inconvenient. It is inconvenient to store in some places.

It is therefore an object of the present invention to provide a pushchair that is simple in construction and which stands on itself when folded.

The baby carriage according to the present invention comprises:

a. A pair of front brackets having front wheels at lower portions thereof;

b. A pair of rear brackets having rear wheels at their lower portions and movably connected to the front brackets by pivot pins at intersections with the front brackets;

c. a pair of seat support bars movably connected at a front portion thereof to an upper portion of the rear bracket;

d. a pair of seat suspension bars movably connected to the rear of the seat support bar at lower portions thereof;

e. A pair of push rods, the lower parts of which are movably connected with the upper parts of the front brackets at the crossing parts with the front brackets through pivot pins;

f. a transverse connecting device for connecting the left and right sides of the baby carriage, which is composed of the front bracket, the rear bracket, the supporting rod, the seat suspension rod and the pushing rod;

g. An open state locking device for fixing the open state of the baby carriage.

The front support, rear support, seat support bar, seat suspension bar, push rod and cross-connect are suitably selected in length and position such that when the stroller is folded, the rear wheels move toward the front wheels and when the stroller is folded, the rear and front wheels lie in substantially the same plane to erect the stroller itself.

According to the present invention, the number of parts constituting the skeleton of the baby carriage is small and the structure is simple. In addition, the baby carriage can stand on itself in a folded state, so that the baby carriage is convenient to carry or store in a proper place.

When it is desired to fold up the stroller, first, the operator has to remove the lock provided by the open state locking means. The operator then rotates the push rod forward, whereupon the rear wheels are moved toward the front wheels. When the baby carriage is folded, the rear wheels and the front wheels are positioned on the same plane, so that the baby carriage can stand on itself.

These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

Fig. 1 is a perspective view illustrating a first embodiment of the present invention;

FIG. 2 is a side view of the stroller as shown in FIG. 1;

Fig. 3 is an enlarged cross-sectional view illustrating a connection portion between the front bracket sleeve 32 and the seat sleeve 34;

FIG. 4 is a side view illustrating the pushchair of FIG. 1 after folding;

FIG. 5 is a side view illustrating a second embodiment of the present invention;

FIG. 6 is a side view illustrating the pushchair of FIG. 5 after folding;

Fig. 7 illustrates a side sectional view of a main portion of a second embodiment of the present invention;

Fig. 8 is a schematic view illustrating a state in which the slide member 117 is moved downward from the state shown in fig. 7;

Fig. 9 is a side view illustrating the sliding member 117 shown in fig. 7 and 8;

Fig. 10 is a plan view of the slide member 117;

Fig. 11 is a side sectional view of the slide member 117;

FIG. 12 is a side cross-sectional view of the push rod sleeve 132 shown in FIGS. 7 and 8;

FIG. 13 is a front view of the push rod sleeve 132;

FIG. 14 is a plan view of the push rod sleeve 132;

fig. 15 is a side sectional view of a connecting portion between the slide member 117 and the front bracket 102;

FIG. 16 is a side cross-sectional view of the connection between the push rod sleeve 132 and the push rod 110;

FIG. 17 is a schematic view showing a state in which the lower end of the guide wall of the push rod 110 is abutted against the slide member 117;

FIG. 18 is a side view illustrating a third embodiment of the present invention;

FIG. 19 is a side view illustrating a folded state of the stroller as shown in FIG. 18;

Fig. 20 is a schematic view illustrating the structure of the components associated with the pair of

cross rails

209 and 210 shown in fig. 18, as seen from the back of the stroller;

Fig. 21 is an enlarged view illustrating a connection portion between the front bracket sleeve 219 and the seat sleeve 220 shown in fig. 18;

fig. 22 is a sectional view illustrating the structure of a connecting portion between the front bracket 202 and the push rod 207;

Fig. 23 is a schematic view illustrating a state in which the slide member 202 is moved downward from the state shown in fig. 22;

Fig. 24 is a sectional view of the sliding member 222 shown in fig. 22 and 23;

Fig. 25 is a plan view of the sliding member 222;

FIG. 26 is a side cross-sectional view of the slide member 222;

FIG. 27 is a side view of push rod sleeve 238 as shown in FIGS. 22 and 23;

FIG. 28 is a front view of push rod sleeve 238;

FIG. 29 is a plan view of push rod sleeve 238;

FIG. 30 is a cross-sectional view taken along line XXX-XXX in FIG. 29;

fig. 31 is a side sectional view of a connecting portion between the slide member 222 and the front bracket 202;

FIG. 32 is a side cross-sectional view of the connection between push rod sleeve 238 and push rod 207;

FIG. 33 illustrates a side cross-sectional view of the structure of the connection between the front bracket 202 and the push rod 207, with the lower end of the push rod 207 resting against the guide wall 236 of the sliding member 222;

Fig. 34 is a plan view illustrating the structure of a connecting portion between the push rod 207 and the cross rod 210;

FIG. 35 is a rear elevational view of the structure illustrated in FIG. 34, as seen from the rear of the stroller;

Fig. 36 is an enlarged view illustrating a connecting member between the center member 249a and the right side member 249c of the lateral connecting member 249 shown in fig. 20;

FIG. 37 is a cross-sectional view taken along line XXXVII-XXXVII as shown in FIG. 34;

Fig. 38 is a schematic view illustrating a state in which the push rod sleeve 238 is pushed slightly forward from the state shown in fig. 37.

Fig. 1 is a perspective view of a first embodiment of the present invention, and fig. 2 is a side view thereof.

The pushchair shown in the drawings comprises a pair of

front brackets

3 and 4 having

front wheels

1 and 2, respectively, at their lower ends, a pair of

rear brackets

7 and 8 having

rear wheels

5 and 6, respectively, at their lower ends, a pair of seat support bars 9 and 10 and a pair of seat suspension bars 11 and 12, a pair of push bars 13 and 14, a front bracket connecting member 15 serving as a cross-connecting means connecting both sides of the pushchair, a pair of cross bars 16 and 17 serving as cross-connecting means, a hook 18 serving as an open state locking means for fixing the open state of the pushchair, and a pair of

links

19 and 20 serving as open state locking means.

The

front brackets

3,4 and the

rear brackets

7,8 are mutually crossed and are respectively articulated at their intersection by

pivot pins

21 and 22. The front portions of the

seat support rods

9 and 10 are movably coupled to the upper portions of the

rear brackets

7 and 8 by

pivot pins

23 and 24, and the lower ends of the

seat suspension rods

11 and 12 are movably coupled to the rear portions of the

seat support rods

9 and 10 by

pivot pins

25 and 26.

The lower parts of the

push rods

13 and 14 are movably connected to the upper parts of the

front brackets

3 and 4 by

pivot pins

27 and 28. As shown, the

push rods

13,14 and the

seat suspension rods

11,12 cross each other and are movably connected together at their intersections by

pivot pins

29 and 30.

Handles

38 and 39 are formed at the upper ends of the

push rods

13 and 14 for the pushchair to grasp. The front bracket connecting part 15 is movably connected at both ends to the

front brackets

3 and 4, respectively, and is foldable at the middle portion thereof in the direction of arrow a. A pair of cross bars 16 and 17 cross each other and are movably connected at the crossing thereof. The upper end of a cross bar 16 is movably connected to the push rod 13 on the right side and the lower end thereof is connected to the rear bracket 8 on the left side. The other cross bar 17 is movably connected at its upper end to the push bar 14 provided on the left side and at its lower end to the rear bracket 7 provided on the right side.

The

front brackets

3 and 4 have

bushings

31 and 32, respectively, adapted to slide thereon. The

seat support rods

9 and 10 have

seat sleeves

33 and 34, respectively, adapted to slide thereon. The

front bracket sleeves

31 and 32 are movably connected with the

seat sleeves

33 and 34. Fig. 3 shows an enlarged cross-sectional view of the connection between the front bracket sleeve 32 and the seat sleeve 34. Referring to the figure, the front bracket sleeve 32 is slidably mounted with the front bracket 4, and the seat sleeve 34 is slidably mounted with the seat support bar 10. The front support sleeve 32 and the seat sleeve 34 are movably coupled together by pivot pins 35. The front bracket sleeve 31 and the seat sleeve 33 provided on the right side are also movably connected together. As shown in fig. 3.

Referring to fig. 1, support bars 40 and 41 are provided between the

seat tubes

33,34 and the front bracket connecting member 15 in order to establish a movable relationship between the sliding condition of the

seat tubes

33,34 and the folding condition of the front bracket connecting member 15.

Fig. 1 and 2 show the stroller open. To fix this open state, a hook 18 and a pair of

links

19 and 20 are provided. The hook 18 is movably connected to the front support 4 by a pivot pin 42, the hook 18 being adapted to be connected to a connecting pivot pin 37 provided at the lower end of the push rod 14 so as to bring the push rod 14 into a defined relationship with the front support 4. The same hook is provided between the front bracket 3 and the push rod 13 located on the right side of the pushchair. A pair of

links

19 and 20, as shown in fig. 1, fix the crossing angle between the pair of crossing

prongs

16 and 17 and thereby fix the positional relationship between the

push rods

13 and 14 and the

rear brackets

7 and 8.

The infant-bearing seat on the pushchair is secured in its seat portion by

seat support rods

9 and 10, while its backrest portion is secured by

seat suspension rods

11 and 12. The backrest part of the seat can be fixed by

push rods

13 and 14.

The

front brackets

3,4 and the seat support bars 9,10 are connected together by

front bracket sleeves

31,32 and

seat sleeves

33, 34. But because the seat suspension bars support the rear portions of the seat support bars 9 and 10, this eliminates the absolute need to connect the

front brackets

3,4 and the seat support bars 9,10 together. However, if they are joined together by the

front bracket sleeves

31,32 and the

seat sleeves

33,34, a stronger connection is formed as shown. In addition, since the

front bracket sleeves

31,32 are slidably mounted with the

front brackets

3,4, the

seat sleeves

33,34 and the seat support bars 9 and 10 are slidably mounted, and the connection relationship between the

front brackets

3,4 and the seat support bars 9,10 does not affect the folding condition of the baby carriage which will be discussed later. The open condition of the stroller may be stronger if the ends are restrained when the seat tubes and 34 slide rearward when the stroller is in the open condition.

When it is desired to fold the stroller, the locked state between the

crossbars

16 and 17 must be removed by first removing the hook 18 in the locked state between the

front brackets

3,4 and the

push rods

13,14 and then slightly moving the pair of

links

19 and 20 upward. In this state, the

push rods

13 and 14 are pushed forward, and thus they are rotated about the axes of the pivot pins 27 and 28 in the direction of arrow B shown in fig. 2, and as the

push rods

13 and 14 are rotated, the pivot pins 25,26 (located at the intersections between the

seat support rods

9,10 and the seat suspension rods 11, 12) are moved rearward, as shown by the arrows in fig. 2. At this time, the

seat support rods

9 and 10 relatively slide in the

seat bushings

33 and 34. In addition, the

seat support rods

9 and 10 rotate at the intersections between the

seat sleeves

33,34 and the

front bracket sleeves

31,32 as indicated by arrow D in fig. 2. As a result, the

rear wheels

5 and 6 are moved toward the

front wheels

1 and 2.

In addition, in the above-described operation, the

front bracket sleeves

31 and 32 are gently slid on the

front brackets

3 and 4, referring to fig. 1, and when the above-described folding operation is performed, the support bars 40 and 41 act to fold the front bracket connecting part 15 such that the left and right sides are relatively moved to reduce the lateral space.

Fig. 4 illustrates the folded up condition of the pushchair shown in fig. 1 and 2. As shown, the front and

rear wheels

1,2 and 5,6 are generally in the same plane so that the stroller can stand on its own. In other words, the

front brackets

3,4, the

rear brackets

7,8, the seat support bars 9,10, the seat suspension bars 11,12, the

push rods

13,14 and the cross connection means are selected to be of a suitable length and position to enable said operation, i.e. the

rear wheels

5,6 are moved towards the

front wheels

1,2 when the pushchair is folded up and the

rear wheels

5,6 are substantially in the same plane when the pushchair is folded up.

In the above embodiment, the structure of the stroller is such that the lateral space can be reduced when the stroller is folded, but the stroller can be made without reducing the lateral space. In this case, the pair of cross bars 16 and 17 is no longer absolutely required but can be replaced by a pair of vertically extending parallel bars to connect the

rear brackets

7,8 and the push bars 13,14. In the above embodiment, the front bracket connecting member 15 and the pair of cross bars 16,17 are used as the cross connecting means, however, other members suitable for connecting the left and

right push rods

13,14 may be substituted.

In addition, in the above-described embodiment, the hook 18 and the pair of

links

19 and 20 are used as the open state locking means for fixing the open state of the baby carriage, but this is merely an example, and they may be installed at different positions in different manners.

Fig. 5 and 6 are a second embodiment of the present invention.

The front support 102 with the front wheel 101 and the rear support 104 with the rear wheel 103 can be movably connected together by means of a shaft 105. A seat support bar 107 supporting a seat is movably connected to an upper end of the rear bracket 104. The seat support bar 107 and the front bracket 102 are movably coupled together by a seat sleeve 108 and a front bracket sleeve 109. The seat sleeve 108 is slidably mounted with the seat support bar 107 and the front bracket sleeve 109 is slidably mounted with the front bracket 102.

The upper end of the front bracket 102 is movably connected to the lower end of the push rod 110, and the push rod 10 has a handle 111. The connection between the front bracket 102 and the push rod 110 has a locking mechanism 115 to limit the rotation of the push rod 110.

The connection portion of the seat support bar 107 has a seat suspension bar 112 movably connected thereto, and the upper end of the seat suspension bar 112 is movably connected to the push rod 110. The upper ends of a pair of cross bars 113 and 114 extending in an X-shape are movably connected to the push rod 110, and the lower ends thereof are connected to the rear bracket 104. The crossing angle between the pair of crossing bars 113 and 114 is fixed by a crossing angle defining means 116.

In the state shown in fig. 5, the locking mechanism 115 restricts the rotation of the push rod 110, and the crossing angle fixing means 116 fixes the crossing angle between the crossing levers 113 and 114, thereby maintaining the pushchair in the open state. When the pushchair needs to be folded up as shown in fig. 6, the crossing angle formed by the crossing angle fixing means 116 is eliminated and the locking state by the fixing mechanism 115 is lost. The push rod 110 in fig. 5 is rotated forward, and the state shown in fig. 6 can be obtained.

When the stroller is in the open position, the locking mechanism 115 is positioned through the upper end of the front support 102 in a direction substantially parallel to the lower end of the push rod 110, limiting the rotation of the push rod 110 relative to the front support 102.

Fig. 7 and 8 are side sectional views illustrating main portions of the second embodiment. The locking mechanism 115 of the illustrated push rod comprises a sliding member 117, a spring 118, male and

female coupling parts

119 and 120 and 121 which are capable of cooperating with each other, and a coupling wall 122.

Fig. 9 to 11 individually illustrate the sliding member 117, and fig. 15 illustrates a side sectional view of a connecting portion between the sliding member 117 and the front bracket 102. Referring to these figures, the slide member 117 slides longitudinally along the upper end portion of the front bracket 102 between a first, relatively high position and a second, relatively low position. Not discussed in detail herein. The spring case 126 is fixedly mounted to the upper inner side of the front bracket 102 by pivot pins 127. The spring case 126 and the front bracket 102 have a vertically elongated opening 123 formed therein, through which elongated opening 123 a pivot pin 124 extends, with the slide member 117 fixedly attached to the pivot pin 124. The aperture 128 shown in fig. 9 and 11 is adapted to receive the pivot pin 124 such that the slide member 117 is capable of sliding vertically approximately the same amount as the pivot pin 124 moves within the elongated aperture 123.

As shown in FIG. 15, inside the front bracket 102, the pivot pin 124 has a spring support member 125 fixedly attached thereto. The spring support member 125 is located within the spring case 126. The spring 118 is disposed between the bottom wall of the spring case 126 and the spring support member 125. The spring 118 fixedly pushes the spring support member upwards. In other words, the spring 118 urges the sliding member 117 to return to the relatively high first position.

Referring to fig. 9 to 11, the sliding member 117 has a cylindrical portion 131 extending along the

front bracket

102, and 102 extends through the interior of the sliding member 117. The upper end of the cylindrical portion 131 has a male connecting portion 119. As best seen in fig. 7, the slide member 117 is formed by a connecting wall 122 connected to the lower end of the push rod 110. Guide walls 130 are also formed. So as to be continuous with the connecting wall 122, it can be seen from fig. 10 that the opposite wall, which is suitable for mounting the lower end of the push rod 110, is constituted by a pair of inclined surfaces 129 whose spaces are narrowed. The function of the connecting wall 122, the guide wall 130, and the inclined surface 129 will be described in detail later.

Referring to fig. 7 and 8, a push rod sleeve 132 surrounding the push rod 110 is fixedly attached to the push rod 110 by

pivot pins

133 and 134. The push rod sleeve 132 illustrates the connection between the push rod sleeve 132 and the push rod 110 shown in fig. 16 by way of side cross-sectional views as shown in fig. 12 to 14. Referring to these figures, the push rod sleeve 132 has a pair of convex walls 135 that are movably connected to the upper end of the push rod 110 by a connecting shaft 136, as shown in fig. 7 and 8. I.e., the push rod 110 is movable about an axis connecting the pivot pins 136.

Perforations

137 and 138 as shown in fig. 12 are used to mount pivot pins 133 and 134. The connecting shaft 136 passes through the perforations 139 shown in fig. 12 and the perforations 140 shown in fig. 15.

When the stroller is in the open state, the front end surface of the convex wall 135 of the push rod sleeve 132 is in opposing connection with the cylindrical portion 131 of the slide member 117. The front end surface of the convex wall 135 is connected with the male connecting portion 119 of the slide member 117 by the female connecting

portions

120 and 121.

As shown in fig. 7, when the slide member 117 is in the relatively high first position, the male connecting portion 119 of the slide member is connected with the female connecting portion 120 in the high position. On the other hand, when the slide member 117 is in the relatively low second position, as shown in fig. 8, the male connecting portion 119 connects with the female connecting portion 121 at a low position.

The operation of the locking mechanism 115 is discussed below with reference to fig. 7 and 8.

The upper end of the front bracket 102 is parallel to the lower end of the push rod 110 when the stroller is in an open position. When the slide member 117 is in the first position as shown in fig. 7, the connecting wall 122 connects the lower end of the push rod 110, thereby restricting the rotation of the push rod 110. The locked state may be maintained firm by the action of the spring 118. In addition, the mounting between the male coupling portion 119 and the female coupling portion 120 also firmly maintains the locked state established by the coupling wall 122.

When it is desired to fold the stroller, the slide member 117 slides to the second position shown in fig. 8. In response to movement of the slide member 117, the cylindrical portion 131 flexes outwardly once, which causes the male connecting portion 119 to connect with the female connecting portion 121. When the spring 118 moves the slide member 117 upward, the fit between the connecting male and

female portions

119 and 121 resists such movement. When the slide member 117 is in the second position, the connection between the connecting wall 122 and the lower end of the push rod 110 is removed. Thus, if the push rod 110 is pushed forward, the push rod sleeve 132 rotates in a counterclockwise direction together with the push rod 110, as shown in fig. 8. As a result, the means between the male coupling portion of the slide member 117 and the female coupling portion 121 of the push rod sleeve 132 is eliminated, so that the slide member 117 returns to the first position shown in fig. 7 under the influence of the spring 118.

The operation of the pushchair from the collapsed to the open position is discussed below. When the push rod 110 is rotated to achieve the open state of the stroller, first, the lower end of the push rod 110 rests against the guide wall 130 of the sliding member 117. When the push rod 110 is further rotated in the clockwise direction from this state, the guide wall 130 is pushed downward by the lower end of the push rod 110, thereby sliding the sliding member 117 downward. When the lower end of the push rod 110 is substantially parallel to the upper end of the front bracket 102, the slide member 117 slides upward under the action of the spring 118 until the state shown in fig. 7 is obtained. Thus, the locking mechanism 115 no longer needs to perform a special operation of the locked state due to the presence of the guide wall 130. However, if a slight decrease in the handling performance is not counted, the guide wall 130 may not be used. In this case, the sliding member 117 must be manually slid down before the upper end of the front bracket 102 has been parallel to the lower end of the push rod 110.

In addition, the inclined surface 129 formed on the slide member 117 serves as a smooth guide push rod 110 when the latter rotates clockwise as shown in fig. 17.

While the locking mechanism is illustrated in the illustrated embodiment as being located on the left side of the stroller, it is noted that the same locking mechanism is located on the right side.

Fig. 18 and 19 show a second embodiment of the present invention. 18 shows the open condition of the pushchair and fig. 19 shows the folded condition of the pushchair. Both figures show the left side of the pushchair, the right side being symmetrical to the one shown.

The stroller includes a pair of front brackets 202 each having a front wheel 201 at a lower end thereof, a pair of rear brackets 204 each having a rear wheel 203 at a lower end thereof, a pair of seat support bars 205, a pair of seat suspension bars 206, a pair of push rods 207, a front bracket connecting member 208 for connecting a lateral connecting means of the other side of the stroller, a pair of cross bars 209 and 210 serving as the lateral connecting means, and an open state locking means 211 for fixing the stroller in an open state.

The front and

rear brackets

202 and 204 cross each other and are movably coupled together at their intersection by pivot pin 212. The front portion of the seat support bar 205 is movably coupled to the upper portion of the rear bracket 204 by pivot pins 213. The lower portion of the seat suspension link 206 is movably coupled to the lower portion of the seat support bar 205 by a pivot pin 214.

The lower portion of the push rod 207 is movably connected to the upper portion of the front bracket 202 by a connecting shaft 215. In the open position of the pushchair, the lower portion of the pushrods 207 is parallel to the upper portion of the front brackets 202. The upper end of the push rod 207 has a handle 216 for grasping by a pushchair operator. The push rod 207 and the seat suspension bar 206 are movably coupled together by a pivot pin 217.

Although not clearly shown in the drawings, the front bracket connecting member 208 is movably connected to the pair of front brackets 202 and may be folded down at the middle thereof.

Fig. 20 is a schematic diagram illustrating a pair of

crossbars

209 and 210 shown in fig. 18 projected from the rear of the stroller. A pair of cross bars 209 and 210 cross each other and are movably connected together at their intersections by pivot pins 218. The connection of the pair of cross bars 209 and 210 to the pair of push rods 207 and the pair of rear brackets will be discussed later.

Referring to fig. 18, the front bracket 202 has a front bracket sleeve 219 slidable therealong. The seat support bar 205 has a seat sleeve 220 slidable thereon. The front bracket sleeve 219 and the seat sleeve 220 are movably coupled together. Fig. 21 is an enlarged view of the connection portion between the front bracket sleeve 219 and the seat sleeve 220. Referring to the figure, a front bracket 202 is slidably mounted to the front bracket sleeve 219, and a seat support rod 205 is slidably mounted to the seat sleeve 220. The front support sleeve 219 and the seat sleeve 220 are movably coupled together by a pivot pin 221.

Although not shown in fig. 18 and 19, a support rod is provided between the seat sleeve 220 and the front bracket attachment member 208 for establishing an operative connection between the sliding movement of the seat sleeve 220 and the folding of the front bracket attachment member 208.

Fig. 18 illustrates an open state of the baby carriage, in order to fix the open state, an open state locking device 211 is provided. The open state locking device 211 restricts rotation of the push rod 207 with respect to the front bracket 202, and fixes the crossing angle between the pair of

crossing levers

209 and 210. A detailed description of the open state locking means 211 will be made later.

A seat for receiving an infant provided in the infant seat car is connected to its seat portion by a seat support bar 205 and to its backrest portion by a seat suspension bar 206. Alternatively, the backrest portion may be connected by a push rod 207.

The substantial part of the third embodiment of the present invention, namely the open state locking device 211, will be discussed below.

Fig. 22 and 23 are side sectional views of the open state locking device 211. The open state locking device 211 includes a slide member 222, a spring 223, male and female coupling portions 224, 225,226, which are coupled to each other, and a coupling wall 227.

Fig. 24 to 26 sequentially illustrate the sliding member 222 shown in fig. 22, and fig. 31 is a side sectional view illustrating a connection portion between the sliding member 222 and the front bracket 202. Referring to these figures, the sliding member. Longitudinally sliding between an upper first relatively high position and a second relatively low position of the front bracket. In particular, within the upper end of the front bracket 102, a spring case 229 is secured within it by a pivot pin 228. The spring case 229 and the front bracket 202 have vertically elongated openings 230. The sliding member 222 is fixedly attached to the pivot pin 231. The perforations 232 shown in fig. 24 and 26 mount the pivot pin 231 such that vertical sliding of the slide member 222 is the same as the amount the pivot pin 231 moves in the elongated aperture 230.

As shown in fig. 31, a spring support member 233 is fixedly provided in the front bracket 202. A spring support member 233 is disposed within the spring case 229. The spring 223 is disposed between the bottom wall of the spring case 229 and the spring support member 233. The spring 223 always moves the spring support member 233 upward. In other words, the spring 223 returns the sliding member 222 to the relatively high first position.

Referring to fig. 24 to 26, the sliding member 222 has a cylindrical portion 234,202 extending in the direction of the front bracket 202 and extends through the sliding member 222, and the cylindrical portion 234 has a male coupling portion 224 at an upper end thereof, and as best seen in fig. 22, the sliding member 222 includes a coupling wall 227 coupled to a lower end of the push rod 207 and a guide wall 236 continuous with the coupling wall 227. As shown in fig. 25, the opposite wall adapted to mount the lower end of the push rod 207 is constituted by a pair of inclined surfaces 237 having a decreasing gap therebetween. The function of the connecting wall 223, the guide wall 236 and the inclined surface 237 will be discussed in detail later.

Referring to fig. 22 and 23, a push rod sleeve 223 surrounding push rod 207 is fixedly attached to push rod 207 by

pivot pins

239 and 240. Fig. 27-30 illustrate push rod sleeve 238. Fig. 32 is a side sectional view illustrating a connection portion between push rod sleeve 238 and push rod 207. Referring to the figures, push rod sleeve 238 has a pair of raised walls 241 movably connected to the upper end of push rod 202 by connecting shaft 215. I.e. push rod 207 is movably rotated along connecting shaft 215.

Perforations

242 and 243 as shown in fig. 27 are used to mount pivot pins 133 and 134. The connection shaft 215 passes through the perforation 244 shown in fig. 27 and the perforation 245 shown in fig. 31.

The forward end surface of the convex wall 241 of the push rod sleeve 238 is in opposing relation to the cylindrical portion 234 of the slide member 222 when the stroller is in the open condition. The front end surface of the convex wall 241 is constituted by female connecting

portions

225 and 226 connected with the male connecting portion 224 of the slide member 222.

When the slide member 222 is in the relatively high first position, as shown in fig. 22, the male connecting portion 224 of the slide member 222 connects with the female connecting portion 225 at an elevation. On the other hand, when the slide member 222 is in the relatively lower second position, as shown in fig. 23, the male connecting portion 224 connects with the female connecting portion 226 at a lower position.

The operation of the front bracket 202 and the push rod 207 will now be described with reference to fig. 22 and 23.

The upper end of the front bracket 202 is parallel to the lower end of the push rod 207 when the stroller is in the open position. When the slide member 222 is in the first position shown in fig. 22, the connecting wall 227 connects the lower end of the push rod 207, thus limiting the rotation of the push rod 207. The locked state is firmly maintained by the action of the spring 223. In addition, the means between the male connection portion 224 and the female connection portion 225 also securely maintains the locked state established by the connection wall 227.

When it is desired to fold the stroller, the slide member 222 slides to the second position shown in fig. 23. In response to the action of the slide member 222, the cylindrical portion 234 is bent outwardly once, causing the male connecting portion 224 to connect with the female connecting portion 226, and the fit between the male and female connecting

portions

224 and 226 resists such movement when the spring 223 moves the slide member 222 upwardly. When the slide member 222 is in the second position, the connection between the connecting wall 227 and the lower end of the push rod 207 is released, so that if the push rod 207 is pushed forward, the push rod sleeve 238 rotates in the counterclockwise direction together with the push rod, as shown in fig. 8. As a result, the assembly between male coupling portion 224 of slide member 222 and female coupling portion 226 of push rod sleeve 238 is removed, such that slide member 222 returns to the first position shown in fig. 22 under the influence of spring 223.

The operation of the pushchair from the folded to the unfolded position is discussed below. When the push rod 207 is rotated to achieve the open state of the pushchair, first the lower end of the push rod 207 rests against the guide wall 236 of the sliding member 222. When the push rod 207 is further rotated clockwise from this state, the guide wall 236 is pushed down by the lower end of the push rod 207, with the slide member 222 sliding down. When the lower end of the push rod 207 is parallel to the upper end of the front bracket 202, the slide member 222 slides upward under the action of the spring 223 until the state shown in fig. 22 is reached. Thus, the presence of guide wall 236 does not require a special operation to put locking device 211 in the locked state. However, if the reliability is allowed to be better or worse, the guide wall 236 may not be provided. In that case, the sliding member 222 must be manually slid downward before the upper end of the front bracket 202 is parallel to the push rod 207.

In addition, the inclined surface 237 formed on the slide member 222 serves to smoothly guide the push rod 207 when the push rod 207 is rotated clockwise as shown in fig. 33.

Fig. 34 is a plan view illustrating the structure of the connecting portion between the pair of push rods 207 and the pair of cross bars 209 and 210. In this figure, irrelevant sections are omitted. Fig. 35 is a rear view of the portion shown in fig. 34.

Referring to fig. 20 and 34, 35, the inner lateral surfaces of a pair of push rod bushings 238 located on the left and right have an L-shaped connecting member 246 connected thereto by pivot pin 240. Each link 246 is rotatable in a transverse vertical plane. An upper end of a cross bar 209 is movably connected to a connecting member 246 located on the right side of the stroller by a bolt 248. The upper end of the other cross bar 210 is pivotally connected to the left side connecting member 246 of the stroller by pivot pin 247. A transverse link 249 extending transversely of the stroller is connected between the pair of link members 246 by

pivot pins

247 and 248. As best seen in fig. 20, a transverse link 249 is comprised of three components, a center component 249a, a left side component 249b and a right side component 249c. The left end of the left side member 249b is movably connected to the connecting member 246 by pivot pin 247 and the right end thereof is movably connected to the center member 249a by pivot pin 250. The right end of the right member 249c is movably coupled to the connecting member 246 by pivot pin 248 and the left end thereof is movably coupled to the center member 249a by pivot pin 251. In other words, the transverse connection member 249 may be folded upward at the middle portion thereof as indicated by arrows a and B in fig. 20.

Fig. 36 is an enlarged schematic view of a connecting portion between the center member 249a and the right member 249c of the transverse link 249. As shown, the central member 249a is formed of an upper surface abutment wall 252 which can abut against the right member 249c to prevent folding downwardly, said abutment wall 252 abutting against the upper surface of the right member 249c when the stroller is in the open condition. A similar structure is used between the left side member 249b and the center member 249 a. In fig. 36, the respective slightly upwardly folded condition of the center member 249a and the right member 249c is indicated by a broken line.

Referring to fig. 18 and 20, each of the pair of rear brackets 204 has a connecting element 256 movably connected thereto by a pivot pin 263. The rear bracket connecting member 253 is connected between a pair of connecting elements 256 by

pivot pins

257 and 258. As shown in fig. 20, the rear bracket connecting member 253 is composed of a left link 253a and a right link 253 b. The left link 253a is movably connected to a connecting element 256 located on the left side of the stroller by a bolt 257. The right side link 253b is pivotally connected to the right side connecting element 256 of the stroller by pivot pin 258. The left and

right links

253a and 253b are movably coupled together by pivot pins 254. The right link 253b is constituted by a rest wall adapted to rest against the upper surface of the left link 253a, said rest wall 255 preventing the downward folding of the connecting member 253. However, the rear connecting member 253 is allowed to be folded upward from the state shown in fig. 20.

As can be seen in fig. 20, the lower end of one crossbar 209 is movably coupled to the left-side link 253a by pivot pin 259 and the other crossbar 210 is movably coupled to the right-side link 253b by pivot pin 260.

Referring to fig. 28, 29 and 34, 35, the inner surface of push rod sleeve 238 is fixedly provided with an inwardly extending support wall 261. The shape of the support wall 261 is best seen in figures 28 to 30. Fig. 30 is a cross-sectional view taken along line XXX-XXX in fig. 29. As shown in fig. 30, the support wall 261 has a downwardly projecting appendage 262.

FIG. 37 is a schematic view taken along line XXXVII-XXXVII in FIG. 34. Referring to fig. 37, 34 and 35, when the stroller is in an open state, i.e., when the rotation of the push rod 207 is defined by the connecting wall 227 of the sliding member 222, the support wall 261 rests against the upper surface of the transverse link 249 to thereby limit the folding of the transverse link 249. Referring to fig. 20, the constraint on the folding of the transverse link 249 fixes the intersection angle of the pair of

crossbars

209 and 210. Further, as is clear from fig. 18, the fixing of the crossing angle of the pair of cross bars 209 and 210 fixes the crossing angle of the front and

rear brackets

202 and 204. In the same manner, the open state of the pushchair is easily maintained stable by the connection between the sliding member 222 on the front bracket 202 and the lower end of the push rod 207.

When it is desired to open the stroller, the slide member 222 can be slid to the second position shown in fig. 23. When the push rod 207 rotates forward, the support wall 261 is removed from the upper surface of the transverse link 247, as shown in fig. 38. In this way, the upward folding of the transverse link 249 can be performed, and the rotation of the pair of

crossbars

209 and 210 can also be performed. Thus, by rotation of the push rod 209, the stroller is folded laterally and longitudinally until the condition shown in fig. 19 is reached.

The described embodiment is merely an example of the invention. Accordingly, many variations are possible within the scope of the invention. For example, the use of the rear bracket attachment member 253 is not absolutely required in fig. 20. In this case, the pair of cross bars 209 and 210 can be movably connected to the pair of rear brackets 204, for example, by spherical bearings (SPHERICAL BEARING). But the rear bracket connecting member 253 is used to reinforce the structure of the stroller in the open state.

In the above embodiment, the pair of slide members 222, the pair of springs 223, the mutually connected concave-

convex portions

224 and 226, and the pair of connecting walls 227 are used as the push rod locking mechanism to prevent the push rod 207 from rotating relative to the front bracket 202. But a different push rod locking mechanism may be used. For example, the hook and connecting pivot pin as described in the first embodiment may be used to inhibit rotation of the push rod.

While the invention has been illustrated and described in detail, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the spirit and scope of the present invention being limited only by the terms of the appended claims.

Claims

1. A baby stroller comprising: a pair of front supports (3, 4) having front wheels at their lower portions, a pair of rear supports (7, 8) having rear wheels at their lower portions, the front supports and the rear supports being movably connected to each other at their intersections by a pivot pin, a pair of seat support rods (9, 10) extending front and rear to support a seat, the front portions of the seat support rods being movably connected to the upper ends of the rear supports, the lower portions of the seat support rods being movably connected to the upper portions of the front supports (3, 4), a pair of push rods (13, 14) being movably connected to the upper portions of the front supports (3, 4), a transverse connecting device (15, 16, 17) for connecting the left and right sides of the baby stroller formed by the front supports (3, 4), the rear supports (7, 8), the seat support rods (9, 10) and the push rods (13, 14), and an open state locking device (18, 19, 20) for fixing the baby stroller in an open state, wherein:

The front portion of the rear support can extend beyond the front support, and the baby seat further includes a seat suspension rod (11, 12) whose lower portion is movably connected to the rear portion of the seat support rod (9, 10), the push rod intersects with the seat suspension rod, and the push rod and the seat suspension rod are movably connected at their intersection by a pivot pin, and the front support (3, 4), the rear support (7, 8), the seat support rod (9, 10), the seat suspension rod (11, 12), the push rod (13, 14) and the transverse connecting device (15, 16, 17) have lengths and positions that are appropriately selected to achieve the following function: when the baby seat is folded, the rear wheels move toward the front wheels and when the baby seat is in a folded state, the rear wheels and the front wheels are placed on approximately the same horizontal plane, so that the baby seat can be erected.

2. The baby carriage according to claim 1, characterized in that the front bracket (3, 4) has a front bracket sleeve (31, 32) capable of sliding thereon, and the seat support rod (9, 10) has a seat sleeve (33, 34) capable of sliding thereon;

The front support sleeve (31, 32) and the seat sleeve (33, 34) are movably connected together at their intersection via a pivot pin.

3. The infant stroller according to claim 1, wherein the transverse connecting device comprises:

A front bracket connecting member (15) connected between the pair of front brackets (3, 4) and foldable in the middle thereof, and;

A pair of cross rods (16, 17) intersecting each other and movably connected at their intersection, wherein the upper ends of the cross rods are movably connected to the pair of push rods (13, 14) and the lower ends thereof are movably connected to the pair of rear brackets (7, 8).

4. The baby carriage according to claim 3, wherein the front support (3, 4) has a front support sleeve (31, 32) that can slide on the support (3, 4).

The seat support rods (9, 10) have seat sleeves (33, 34) that can slide thereon.

The front support sleeve (31, 32) and the seat sleeve (33, 34) are movably connected together at their connection points by a pivot pin, and;

Support rods (40, 41) are arranged between the seat sleeves (33, 34) and the front bracket connecting component (15) to establish a movable connection between the sliding movement of the seat sleeves (33, 34) and the folding movement of the front bracket connecting component (15).

5. The baby carriage according to claim 3, wherein the open state locking device includes a device for limiting the rotation of the push rod (13, 14) relative to the front support (3, 4).

6. The baby carriage according to claim 3, wherein the open state locking device includes a device (19, 20) for fixing the crossing angle of the pair of crossing bars (16, 17).

7, the baby seat according to claim 1, characterized in that the push rod for limiting the rotation of the open state locking means relative to the front bracket by making the upper end of the front bracket parallel to the lower end of the push rod to complete, and comprising;

a sliding member (117) capable of longitudinally sliding between a relatively high first position and a relatively low second position on the front bracket (102),

A spring (118) for returning the sliding member (117) to the first position;

Convex and concave portions (119, 120, 121) formed at opposing portions of the sliding member (117) and the push rod (110) and capable of fitting together to limit movement of the sliding member when the sliding member (117) is in at least the second position, and;

A connecting wall (122) is fixedly arranged on the sliding component (117), and the connecting wall (122) can be connected to the lower end of the push rod (110) when the sliding component (117) is in the first position, and is separated from the push rod (110) when the sliding component (117) is in the second position to allow the push rod (110) to rotate.

8. The baby seat according to claim 7, wherein the sliding member (117) is formed by a guide wall (130), and the guide wall (130) can move downward when the baby seat is transformed from a folded state to an open state, thereby causing the sliding member (117) to slide downward.

9. The baby seat according to claim 1, characterized in that the baby seat is foldable, wherein the pair of push rods are designed so that when the baby seat is in the open state, the lower portion of the pair of push rods is parallel to the upper portion of the front bracket;

The baby stroller further comprises:

A pair of connecting members (246) connected to the pair of push rods (207) to be able to rotate in a vertical plane;

a pair of cross bars (209, 210) intersecting each other and movably connected at the intersection, the upper ends of the cross bars being movably connected to the pair of connectors (246) and the lower ends being movably connected to the pair of rear supports (204), and,

The other end of the middle foldable transverse connecting rod (249) is movably connected to the pair of connecting members (246), and;

The open state locking device includes;

a push rod locking mechanism (222, 223, 224, 226, 227) for limiting the rotation of the push rod (207) relative to the front bracket (202),

A support wall (261) is fixedly provided on the push rod (207) and can lean against the upper surface of the transverse connecting rod (249) to limit the folding of the transverse connecting rod (249) when the rotation of the push rod (207) is limited by the push rod locking mechanism (222, 223, 224, 226, 227).

10. The baby seat according to claim 9, wherein the transverse link (249) and the pair of cross bars (209, 210) are connected to the pair of connecting members (246) by the same pivot pins (247, 248).

11. The infant stroller according to claim 9, wherein the push rod locking mechanism comprises:

A pair of sliding components (222) are capable of sliding along the length direction between a relatively high first position and a relatively low second position at the upper end of the front bracket (202),

a pair of springs (223) for returning the sliding member (222) to the first position,

Concave and convex portions (224, 226) formed at opposing portions of the sliding member (222) and the push rod (207) and capable of cooperating with each other to limit movement of the sliding member (222) when the sliding member (222) is at least in the second position, and;

A pair of connecting walls (227), each of which can connect to the lower end of the push rod (207) to limit the rotation of the push rod when the sliding component (222) is in the first position, and can disengage the push rod (207) to allow the push rod (207) to rotate when the sliding component (222) is in the second position.

12. The baby seat as claimed in claim 9, characterized in that the sliding member (222) is composed of two guide walls (236), and the guide walls (236) can be pushed downward by the lower end of the push rod (207) when the baby seat changes from the folded state to the opened state to guide the sliding member (222) to slide downward.