CN120363980A - Child cart - Google Patents

Abstract

The present invention discloses a child stroller, which comprises a frame that can be switched between an unfolded state and a folded state, the frame comprising a bottom bracket, a main bracket pivotally connected to the rear side of the bottom bracket at the bottom side, a rear bracket pivotally connected to the rear side of the bottom bracket at the front side, and a rear wheel connected to the rear bracket; the child stroller also comprises a rear linkage device, one side of the rear linkage device is connected to the main bracket, and the other side is connected to the rear bracket; during the folding process of the frame, when the main bracket rotates forward and downward, the rear linkage device is driven to drive the rear bracket to rotate forward and upward. After folding, the overall height of the rear bracket, the rear wheel and the main bracket is greatly reduced compared to the unfolded state, so that the upper and lower heights of the frame after folding can be reduced, and then the overall volume of the frame after folding can be reduced, so that it is convenient to carry, carry and store; and the rear bracket can be linked by rotating the main bracket downward, so that the folding operation is very simple.

Description

Child cart

Technical Field

The invention relates to the field of infant products, in particular to a baby stroller.

Background

The child cart is used for taking children, so that the burden of parents holding the children is reduced, and the parents can travel more conveniently with the children.

The baby stroller generally comprises a frame and a seat connected to the frame, and for the purpose of more convenient use, the frame can be generally made to be converted between an unfolding state and a folding state, but the folding operation of the frame of some baby strollers is very complicated, and the volume is relatively large after folding, so that the baby stroller is inconvenient to carry, carry and store.

Disclosure of Invention

The invention aims to overcome the defects, and provides the baby stroller which is simple and convenient to fold and operate and small in volume after folding. .

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

The baby stroller comprises a frame capable of being switched between an unfolding state and a folding state, wherein the frame comprises a bottom bracket, a main bracket, a rear bracket and a rear linkage device, the lower side of the main bracket is pivoted to the rear side of the bottom bracket, the front side of the rear bracket is pivoted to the rear side of the bottom bracket, the rear bracket is connected with a rear wheel, one side of the rear linkage device is connected with the main bracket in a matched manner, the other side of the rear linkage device is connected with the rear bracket in a matched manner, and when the main bracket rotates forwards and downwards in the folding process of the frame, the rear linkage device is driven to drive the rear bracket to rotate forwards and upwards.

The baby stroller further comprises a front support which is pivoted to the front side of the main support, front wheels are connected to the front support, a front linkage device is arranged between the front supports and the rear support, the front side of the front linkage device is connected with the front support in a matched mode, the rear side of the front linkage device is connected with the rear support in a matched mode, and when the rear support rotates forwards, the front linkage device is driven to drive the front support to rotate forwards and upwards.

The lower side of the main support is rotationally pivoted with the bottom support around a first rotating shaft, the front side of the rear linkage device is rotationally pivoted with the main support around a second rotating shaft, the rear side of the rear linkage device is pivoted with the rear support, and the first rotating shaft is positioned at the front side or/and the upper side of the second rotating shaft when the frame is in a unfolded state.

The rear bracket comprises a left rear leg and a right rear leg which are respectively pivoted on the left side and the right side of the rear side of the main bracket, and a first connecting piece of which the left end and the right end are respectively connected with the left rear leg and the right rear leg, the rear linkage device comprises a left first linkage piece and a right first linkage piece, the front sides of the two first linkage pieces are respectively pivoted on the left side and the right side of the main bracket, and the rear sides are pivoted with the first connecting pieces.

The front linkage device is characterized in that the front side of the front linkage device is pivoted with the front support, the rear side of the front linkage device is pivoted with the rear support, the front linkage device comprises a left second linkage piece, a right second linkage piece and a left third linkage piece, the left second linkage piece and the right third linkage piece are respectively connected with two rear feet and can rotate together with the rear feet, the rear sides of the left third linkage piece and the right third linkage piece are respectively pivoted with the two second linkage pieces, the front sides of the left third linkage piece and the right third linkage piece are pivoted with the front support, and when the frame is in a unfolding state, the pivoted positions of the third linkage pieces and the second linkage pieces on the same side are located at the rear sides of the connection positions of the rear feet and the second linkage pieces.

The front support comprises a left front foot and a right front foot, wherein the two front feet are both pivoted on the bottom support, the front ends of the two third linkage elements are respectively pivoted with one front foot, or the front support further comprises a connecting part, the left end and the right end of the connecting part are respectively connected with the left front foot and the right front foot and can rotate together with the two front feet, and the front ends of the two third linkage elements are both pivoted with the connecting part.

The main support comprises a support tube with the lower end pivoted with the main support and a push handle tube with the lower side connected in the support tube in a relatively up-down movable manner, the lower end of the support tube is fixedly connected with a connecting seat, and the connecting seat is pivoted with the bottom support.

The connecting device comprises a bottom bracket, a connecting seat, a first linkage piece, a third linkage piece, a second linkage piece, a first linkage piece, a second linkage piece, a connecting seat and a connecting seat, wherein the rear side of the bottom bracket is provided with an accommodating cavity with an upward opening, the connecting seat is arranged in the accommodating cavity, the side walls of the left side and the right side of the accommodating cavity are arranged at intervals with the side walls of the corresponding sides of the bottom bracket, and the first linkage piece, the third linkage piece and the second linkage piece of the corresponding sides are sequentially arranged between the side walls of the accommodating cavity and the side walls of the bottom bracket.

A first locking device used for limiting the relative rotation of the support tube and the bottom bracket is arranged between the support tube and the bottom bracket, the lower end of the support tube is connected with a first driving piece, and the first locking device and the first driving piece are matched and arranged in a way that the first driving piece which moves downwards along with the pushing handle tube can unlock the first locking device.

The first locking device comprises a first locking piece, a first elastic piece and a locking protrusion, wherein the first locking piece is connected to the connecting seat in a seesaw mode in an up-down mode, the first elastic piece is arranged between the first locking piece and the connecting seat, the locking protrusion is convexly arranged on the corresponding side wall of the accommodating cavity, under the action of the first elastic piece, the upper side of the first locking piece rotates towards the direction of the supporting tube and stretches into the supporting tube, the lower side of the first locking piece rotates towards the direction of the locking protrusion and is buckled on the lower side of the locking protrusion, the first locking device is in a locking state, one side face of the lower side of the first driving piece, which faces the first locking piece, is provided with an inclined surface or an arc-shaped surface, the first driving piece which moves downwards along with the pushing tube pushes the upper side of the first locking piece to rotate reversely through the inclined surface or the arc-shaped surface, so that the lower side of the first locking piece moves towards the side of the supporting tube in a rotating mode to be separated from a hook buckle of the locking protrusion, and the first locking device is unlocked.

Because the invention adopts the technical proposal, the invention has the following beneficial effects:

1. Because the rear bracket rotates and moves forwards and upwards during folding, the overall height of the rear bracket, the rear wheel and the main bracket is greatly reduced compared with that in a unfolded state, so that the up-down height of the folded frame can be reduced, the overall volume of the folded frame is further reduced, the folded frame is smaller in volume, and the folded frame is convenient to carry, carry and store;

2. The front bracket can also rotate and move forwards and upwards during folding, so that the upper and lower heights of the folded frame are further reduced, and the whole volume of the folded frame is further reduced;

3. when the main support is rotated downwards, the rear support can be linked, so that the folding operation is very simple and convenient;

4. The first locking device can be unlocked by downwards moving the pushing handle pipe, so that the whole length of the main support 2 after the frame is folded is reduced, the whole volume of the frame after the frame is folded is further reduced, and the folding operation is further simplified;

5. The second locking device can be unlocked by pressing the second driving piece, so that the pushing handle pipe can move downwards, and the folding operation is further simplified;

6. the frame has simple integral structure, small volume and light weight during unfolding, thereby being more convenient to use and reducing the manufacturing cost.

Drawings

FIG. 1 is a schematic perspective plan view of a child stroller frame according to the present invention in an expanded state;

FIG. 2 is a schematic perspective view of the child stroller frame of the present invention in an expanded state;

FIG. 3 is a schematic plan view of the child stroller frame of the present invention in an expanded condition;

FIG. 4 is an enlarged schematic perspective view of the child stroller frame of the present invention in a unfolded state from a top view;

FIG. 5 is an exploded enlarged schematic view of a child stroller frame portion assembly according to the present invention;

FIG. 6 is a schematic view showing the assembly of the frame pivot base and the support tube of the first linkage 4 of the stroller of the present invention;

FIG. 7 is an enlarged schematic view according to section B of FIG. 4;

FIG. 8 is an enlarged schematic view of an explosion according to FIG. 7;

FIG. 9 is an enlarged schematic view according to section C of FIG. 4;

FIG. 10 is a schematic cross-sectional view taken along the direction A-A in FIG. 3;

FIG. 11 is an enlarged schematic view according to section D of FIG. 10;

FIG. 12 is an enlarged schematic view according to section E of FIG. 10;

FIG. 13 is an enlarged schematic view according to section F of FIG. 10;

FIG. 14 is an enlarged schematic view of an explosion of the assembly of FIG. 13, without section;

FIG. 15 is an enlarged schematic view of the child stroller frame lock of the present invention;

FIG. 16 is an enlarged schematic view of a first drive member of the inventive stroller frame;

FIG. 17 is an enlarged schematic view of a third driver body of the inventive stroller frame;

FIG. 18 is an enlarged schematic view of the combination of the third drive member and the locking member of the inventive stroller frame;

FIG. 19 is an enlarged schematic view of a combination of the first drive member and the third drive member bodies of the inventive stroller frame;

FIG. 20 is a schematic cross-sectional view of the stroller frame of the present invention during folding;

FIG. 21 is an enlarged schematic view according to portion G of FIG. 20;

FIG. 22 is a schematic plan view of the stroller frame of the present invention during folding;

FIG. 23 is a schematic plan view of the stroller frame of the present invention in a collapsed condition;

FIG. 24 is a schematic plan view of the child stroller frame according to the present invention in a collapsed configuration at an alternative angle;

FIG. 25 is a perspective view of the stroller frame of the present invention in a collapsed configuration;

FIG. 26 is a perspective view of a child stroller frame with a seat and a canopy attached thereto.

Detailed Description

As shown in fig. 1 to 9, the invention discloses a stroller, which comprises a frame 100 capable of being switched between an unfolding state and a folding state, wherein the frame 100 comprises a bottom bracket 1, a main bracket 2 with the lower side pivoted to the rear side of the bottom bracket 1, a rear bracket 3 with the front side pivoted to the rear side of the bottom bracket 1, and a rear wheel 30 connected to the rear bracket 3, the stroller further comprises a rear linkage device, one side of the rear linkage device is connected with the main bracket 2 in a matched manner, the other side of the rear linkage device is connected with the rear bracket 3 in a matched manner, and the rear linkage device is driven to drive the rear bracket 3 to rotate forwards and upwards when the main bracket 2 rotates forwards and downwards in the folding process of the frame 100.

In this embodiment, the lower side of the main support 2 is pivotally connected to the bottom support 1 rotationally about the first pivot 20, the front side of the rear linkage is pivotally connected to the main support 2 rotationally about the second pivot 201, and the rear side is pivotally connected to the rear support 3, and the first pivot 20 is located at the front side or/and the upper side of the second pivot 201 when the frame 100 is in the unfolded state. Thus, in the folding process, when the main support 2 rotates forward and downward around the first rotating shaft 20, the front side of the rear linkage device can be pulled to move upward, and accordingly the rear side of the rear linkage device can pull the rear support 3 to move forward in a rotating manner.

The rear bracket 3 comprises a left rear leg 31 and a right rear leg 31 which are respectively pivoted on the left side and the right side of the rear side of the main bracket 2, and a first connecting piece 32 of which the left end and the right end are respectively connected with the left rear leg and the right rear leg, the rear linkage device comprises a first linkage piece 4, the front side of the first linkage piece 4 is pivoted with the main bracket 2, the rear side is pivoted with the first connecting piece 32, namely, the front side of the first linkage piece 4 is pivoted with the main bracket 2 in a rotating way around a second rotating shaft 201. When the main support 2 rotates around the first rotating shaft 20 to the front lower direction, the front side of the first linkage piece 4 is pulled to rotate upwards, the first connecting piece 32 is pulled by the rear side of the first linkage piece 4 to rotate forwards and upwards, and the whole rear support 3 is pulled to rotate forwards and upwards. In the unfolded state of the frame 100, the first connecting member 32 is located at the rear side of the bottom bracket 1.

In this embodiment, the rear linkage device includes two left and right first linkage members 4, the front sides of the two first linkage members 4 are respectively pivoted to the left and right sides of the main support 2, and the rear sides are respectively pivoted to the first connecting members 32.

The rear wheels 30 are connected to the sides of the left and right rear legs 31 far from the bottom bracket 1.

The baby stroller further comprises a front support 5 pivoted to the front side of the main support 2, front wheels 50 are connected to the front support 5, a front linkage device is arranged between the front supports 5 and the rear support 3, the front side of the front linkage device is connected with the front support 5 in a matched mode, the rear side of the front linkage device is connected with the rear support 3 in a matched mode, and when the rear support 3 rotates forwards, the front linkage device is driven to drive the front support 5 to rotate forwards and upwards.

In this embodiment, the front side of the front linkage is pivoted to the front bracket 5, and the rear side is pivoted to the rear bracket 3. Specifically, the front linkage device comprises a left second linkage member 61, a right second linkage member 61 and a left third linkage member 62, wherein the left second linkage member 61 and the right second linkage member 61 are respectively connected with the two rear legs 31 and can rotate together with the rear legs 31, the rear sides of the left third linkage member 62 and the right third linkage member 62 are respectively pivoted with the two second linkage members 61, the front sides of the left third linkage member and the right third linkage member 62 are both pivoted with the front bracket 5, and when the frame 100 is in a unfolded state, the pivoted positions of the third linkage members 62 and the second linkage members 61 on the same side are positioned at the rear sides of the positions where the rear legs 31 and the second linkage members 61 are connected. So configured, when the rear leg 31 rotates forward, the second linkage 61 rotates forward together therewith, thereby driving the third linkage 62 to also rotate forward, and the third linkage 62 can drive the front bracket 5 to rotate relative to the bottom bracket 1.

The bottom bracket 1 includes a top wall 11 and a side wall 12 extending downward from an outer edge of the top wall 11, and the two rear legs 31 are respectively pivoted to outer sides of the side walls 12 on corresponding sides. Specifically, a pivot 311 capable of rotating along with the rear leg 31 is connected to a side of the rear leg 31 facing the side wall 12, one end of the pivot 311 facing away from the rear leg 31 penetrates into the side wall 12 from outside to inside in a relatively rotatable manner, the second linkage member 61 is located inside the side wall 12 and is fixedly connected to the pivot 311 relatively, and the third linkage member 62 is also located inside the side wall 12. And the second linkage 61 is located between the third linkage 62 and the side wall 12, thereby facilitating assembly of the second linkage 61 and the third linkage 62.

The second linkage 61 includes a connection section 611 connected to the pivot 311, a pivoting section 612 extending from the connection section 611 to the rear side, and the rear side of the third linkage 62 is pivotally connected to the pivoting section 612. In this embodiment, the inner side of the side wall 12 is provided with a receiving groove 120, the connecting section 611 is relatively fixedly sleeved outside the pivot 311, and the connecting section 611 is at least partially rotatably disposed in the receiving groove 120, and the connecting member is disposed outside the receiving groove 120. The middle part of the first positioning member 13 spans the lower side of the connecting section 611, and two ends of the first positioning member 13 are connected with the bottom wall of the side wall of the accommodating groove 120. In this way, the connection section 611 can only rotate in the space defined by the accommodating groove 120 and the first positioning member 13, so that not only the stability of the pin joint of the rear leg 31 and the connection section 611 is ensured, but also the stability of the function of the second linkage member 61 capable of driving the third linkage member 62 during rotation is ensured, and further the stability of the linked rotation function of the front bracket 5 is ensured.

Further, one side of the axial direction of the pivot shaft 311 is provided with a straight surface 3110, and the corresponding one side of the axial direction of the inner hole of the connecting section 611 is also provided with a straight surface, so that when the connecting section 611 is sleeved outside the pivot shaft 311, the connecting section is provided with a straight surface, and thus the pivot shaft 311 rotates along with the rear leg 31, the second linkage 61 rotates together. In addition, the pivot 311 and the second linkage member 61 may be further connected by a screw or a rivet, so that the connection between the two members is more stable, and when the rear leg 31 rotates, the second linkage member 61 may be driven to rotate, and the front bracket 5 may be driven to rotate by the second linkage member 61 and the third linkage member 62.

The side wall 12 at the rear side of the bottom bracket 1 is provided with a notch 122 which is opened downwards at a position corresponding to the first linkage piece 4, and the front side of the first linkage piece 4 extends into the side wall 12 through the notch 122 to be pivoted with the main bracket 2. And since the notch 122 is opened downward, the rotational movement of the first link 4 is not hindered when being retracted.

The front bracket 5 comprises a left front foot 51 and a right front foot 51, the two front feet 51 are both pivoted to the bottom bracket 1, and each front foot 51 is connected with the front wheel 50.

In this embodiment, the front bracket 5 further includes a connecting portion 52, the left and right ends of the connecting portion 52 are respectively connected to the left and right front legs 51 and are rotatable together with the two front legs 51, and the front ends of the two third link members 62 are pivotally connected to the connecting portion 52. In this way, the rotation of the two front feet 51 relative to the bottom bracket 1 can be made more synchronous.

Opposite ends of the left and right front legs 51 (i.e., a right end of the left front leg 51 and a left end of the right front leg 51) are fixedly connected to the left and right ends of the connecting portion 52, respectively. The fixing connection may be integrally formed, that is, the two front legs 51 and the connecting portion 52 may be integrally formed, or may be fixedly connected by a fixing member (such as a screw) so long as the connecting portion 52 can rotate together with the two front legs 51.

In other embodiments, the connecting portion 52 may be omitted, and the front ends of the two third link members 62 may be pivotally connected to the front leg 51.

In this embodiment, each of the front legs 51 is provided with a pivot portion 511, and corresponding pivot grooves 15 are respectively provided on the left and right sides of the front side of the bottom bracket 1, and the pivot portions 511 on the same side are at least partially rotatably disposed in the pivot grooves 15. When assembling, one side of the pivoting part 511 is placed in the pivoting groove 15, the middle part of a second positioning piece 14 spans one side of the pivoting part 511 away from the bottom bracket 1, and two ends of the second positioning piece 14 are fixedly connected with the main bracket 2. Thus, the pivot 511 can rotate relative to the bottom bracket 1 without being separated from the main bracket 2. In this embodiment, the bottom bracket 1 is provided with the pivot slot 15 with a downward opening at the lower side, the middle part of the second positioning member 14 spans the lower side of the pivot portion 511, and two ends of the second positioning member 14 are fixedly connected with the lower side of the main bracket 2.

Preferably, the center lines of the pivot portions 511 of the left and right legs 51 are on the same straight line or parallel to each other, and the center lines of the corresponding left and right pivot grooves 15 are also on the same straight line or parallel to each other. That is, if one of the front legs 51 is pivotally connected to the main support 2 about the rotation axis four and the other front leg 51 is pivotally connected to the main support 2 about the rotation axis five, the center lines of the rotation axis four and the rotation axis five are on the same line or parallel to each other. Thus, the problem that the two front legs 51 cannot be rotated simultaneously with respect to the main frame 2 can be avoided. In this embodiment, the center lines of the pivot portions 511 of the left and right front legs 51 are on the same straight line.

Preferably, the left and right third link members 62 are further fixedly connected to the left and right sides of the at least one second connecting member 63. In this embodiment, the second connecting members 63 are provided with two front and rear members, and the left and right ends of each second connecting member 63 are respectively connected to two third link members 62. So set up, further guarantee the synchronization of two third linkage 62 rotary motion, can also guarantee the homogeneity that fore-stock 5 receives the actuating force to further guarantee the rotatory synchronism of two forelegs 51. Preferably, the two second connecting members 63 are disposed in parallel front and rear, and the fixing connection method of the second connecting member 63 and the third connecting member 62 may be any known and feasible structure.

Each of the front legs 51 is further provided with a front wheel connecting portion 512, each of the front wheel connecting portions 512 is connected with a front wheel seat 54, and the front wheel 50 is connected to the front wheel seat 54. The connection between the front wheel seat 54 and the front wheel 50 is well known and will not be described here.

The main support 2 comprises a support tube 21 with the lower end pivoted with the main support 2, a push handle tube 22 with the lower side connected in the support tube 21 in a relatively up-down movable manner, and the front side of the rear linkage device pivoted with the support tube 21. In this embodiment, the lower end of the supporting tube 21 is fixedly connected with a connecting seat 23, the connecting seat 23 is pivoted with the bottom bracket 1, that is, the connecting seat 23 is pivoted with the bottom bracket 1 in a rotating manner about the first rotating shaft 20, and the front sides of the first linkage members 4 are pivoted with the connecting seat 23, that is, the front sides of the two first linkage members 4 are respectively pivoted with the left and right sides of the connecting seat 23. The front side of the connecting seat 23 is pivoted with the bottom bracket 1, the rear side is provided with a containing hole 231, and the lower side of the supporting tube 21 is arranged in the containing hole 231.

The back side of the bottom bracket 1 is provided with an accommodating cavity 16 with an upward opening, the connecting seat 23 is arranged in the accommodating cavity 16, the front side of the connecting seat 23 is pivoted with the left side wall and the right side wall 12 of the front side of the accommodating cavity 16 through the first rotating shaft 20, the side walls 161 of the left side and the right side of the accommodating cavity 16 are respectively provided with a notch 162 with the upward opening, and the front sides of the two first linkage pieces 4 are respectively positioned outside the side walls 12 of the left side and the right side of the accommodating cavity 16 and pivoted with the connecting seat 23 at the notch positions. So that the front side of the first linkage 4 can be driven to move upwards in a rotating manner without being blocked when the connecting seat 23 rotates around the first rotating shaft 20.

The side walls 161 on the left and right sides of the accommodating cavity 16 are spaced from the side walls 12 on the corresponding sides of the bottom bracket 1, and the first linkage piece 4, the third linkage piece 62 and the second linkage piece 61 on the corresponding sides are sequentially arranged between the side walls of the accommodating cavity 16 and the side walls 12 of the bottom bracket 1, so that the overall structure is compact and the layout is reasonable.

The rear side wall of the accommodating cavity 16 may be spaced from the rear side wall of the bottom bracket 1 and located at the front side of the rear side wall of the bottom bracket 1, or the rear side wall of the accommodating cavity 16 may be integrated with the rear side wall of the bottom bracket 1.

As shown in fig. 10 and 11, a first locking device for limiting the relative rotation of the support tube 21 and the bottom bracket 1 is arranged between the support tube 21 and the bottom bracket 1, a first driving member 71 is connected to the lower end of the support tube 21, and the first locking device and the first driving member 71 are matched and arranged in such a way that the first driving member 71 moving downwards along with the pushing handle tube 22 can unlock the first locking device.

The first locking device comprises a first locking piece 72 rotatably connected to the connecting seat 23 in a seesaw manner, a first elastic piece 73 arranged between the first locking piece 72 and the connecting seat 23, and a locking protrusion 161 protruding on the corresponding side wall 12 of the accommodating cavity 16, a through hole (not shown) is arranged on the pipe wall of the supporting pipe 21 at a position corresponding to the first locking piece 72, a through hole 232 is also arranged on the pipe wall of the accommodating hole 231 at a position corresponding to the first locking piece 72, under the action of the first elastic piece 73, the upper side of the first locking piece 72 rotates towards the direction of the supporting pipe 21 and stretches into the supporting pipe 21 through the through hole, the lower side rotates towards the direction of the locking protrusion 161 and stretches out of the connecting seat 23 through the through hole 232 to be buckled on the lower side of the locking protrusion 161, and the first locking device is in a locking state. In this way, the locking protrusion 161 may block the upward rotation of the first locking piece 72, so that the main support 2 cannot be rotated forward and downward. The first locking member 72 is rotatably connected to the rear side of the connecting seat 23 about three axes of rotation 721.

The lower side of the first driving member 71 facing to one side of the first locking member 72 is provided with an inclined surface or an arc surface 710, and the first driving member 71 moving downward along with the pushing handle tube 22 pushes the upper side of the first locking member 72 to rotate reversely through the inclined surface or the arc surface, so that the lower side of the first locking member 72 rotates to the side facing to the supporting tube 21 to separate from the hook of the locking protrusion 161 (as shown in fig. 20 and 21), thereby unlocking the first locking device, and the connecting seat 23 can rotate relative to the bottom bracket 1 around the first rotating shaft 20, that is, the main bracket 2 can rotate relative to the main bracket 2 together with the first locking member 72. Preferably, the upper side of the ground locking member is also provided with a slope or an arc surface, so that the first driving member 71 can more smoothly drive the first locking member 72. Specifically, when the first driving member 71 moves downward along with the pushing tube 22 to contact with the inclined surface or the arc surface thereof and the upper side of the first locking member 72, the first driving member 71 is pushed to rotate reversely.

In this embodiment, the first locking member 72 is rotatably connected to the rear side of the connecting seat 23, so that the upper side of the first locking member 72 rotates forward and the lower side rotates backward to be locked to the lower side of the locking protrusion 161 by the first elastic member 73. When driven by the first driving member 71, the first locking member 72 is rotated backward on the upper side and rotated forward on the lower side to be disengaged from the locking protrusion 161.

As shown in fig. 13 to 19, a second locking device for limiting the upward and downward movement of the push handle tube 22 and the support tube 21 is provided between the push handle tube 22 and the support tube 21, and the push handle tube 22 can be moved downward after unlocking the second locking device.

The second locking device comprises a second locking piece 81 which is connected to the push handle pipe 22 in a relatively movable manner, a second elastic piece 82 which is arranged between the second locking piece 81 and the push handle pipe 22, and a matching part which is arranged on the support pipe 21, under the action of the second elastic piece 82, the second locking piece 81 is matched with the matching part, the second locking device is in a locking state, and the push handle pipe 22 cannot move up and down relative to the support pipe 21.

The second locking member 81 includes a body 811 and a locking member 812 disposed on one side of the body 811, in this embodiment, the locking member 812 includes an upper locking portion 8121 and a lower locking portion 8122 disposed on one side of the body 811 at an upper-lower interval, the locking portion 812 includes a locking hole 211 disposed on a wall of the support tube 21 and an upper end wall of the support tube 21, corresponding upper and lower holes are disposed on the wall of the push handle tube 22, the second locking member 81 moves in a direction toward the first locking hole 211, the upper locking portion 8121 is disposed at an upper end of the support tube 21 after passing through the upper hole, the lower locking portion 8122 is disposed in a locking state after passing through the lower hole, and the second locking member 81 cannot move up and down, so that the push handle cannot move up and down relative to the support tube 21.

In other embodiments, the matching portion may include two upper and lower locking holes 211 provided on the wall of the support tube 21, the upper locking portion 8121 and the lower locking portion 8122 of the second locking member 81 are respectively engaged into the two upper and lower locking holes 211, or one locking hole 211 may be provided on the wall of the support tube 21, and only one locking portion 812 is provided, and the one locking portion 812 is engaged into the one locking hole 211. Thus, the second locking member 81 cannot move up and down. So that the push handle cannot move up and down relative to the support tube 21.

The upper side of the first driving member 71 is relatively and fixedly connected to the lower side of the push handle tube 22, a mounting cavity 712 is provided in the upper side of the first driving member 71, an upper limiting portion 713 and a lower limiting portion 714 are provided on the inner wall of the mounting cavity 712 at intervals, the second locking member 81 is relatively movably disposed between the upper limiting portion 713 and the lower limiting portion 714, a locking portion 812 corresponding to the second locking member 81 is provided on the wall of the mounting cavity 712 and the wall of the push handle tube 22, and a through hole 715 for the locking portion 812 to pass through is provided.

The push handle tube 22 is provided with unlocking means for unlocking the second locking means. Referring to fig. 10 and 12, in this embodiment, the unlocking device includes a second driving member 91 relatively movably connected to the upper side of the push handle, and a third driving member 93 relatively movably connected to the inside of the push handle tube 22, where the upper side of the third driving member 93 is disposed in cooperation with the second driving member 91, and the lower side of the third driving member is disposed in cooperation with the locking member, so as to drive the second driving member 91 to move relative to the push handle tube 22, and the third driving member 93 is driven to move downward to push the locking member to move so as to disengage from the locking portion 812, thereby unlocking the second locking device.

Preferably, one side of the second driving member 91 is located inside the push handle tube 22, and the other side is located outside the push handle tube 22, so as to facilitate the operation of the second driving member 91. The end surface of the second driving member 91 located in the pushing handle tube 22 is provided with an inclined surface 911, or/and the upper side of the third driving member 93 facing the side of the second driving member 91 is also provided with an inclined surface 931. In this embodiment, the second driving member 91 and the third driving member 93 are preferably provided with inclined surfaces for matching.

The lower end of the third driving member 93 is provided with a main body 930 disposed in the mounting cavity 712 so as to be capable of moving up and down relatively, the main body 930 is square frame-shaped, and includes a top plate 931, a bottom plate 932, and two side plates 933 respectively connected to two sides of the top plate 931 and the bottom plate 932, and the upper limiting portion 713 and the lower limiting portion 714 extend into between the top wall 11 and the bottom wall, that is, the top plate 931 of the four-square frame-shaped main body 930 is disposed between the upper limiting portion 713 and the top wall 11 of the mounting cavity, and the bottom plate 932 is disposed between the lower limiting portion 714 and the bottom wall of the mounting cavity 712. A third elastic member 94 is disposed between the upper limiting portion 713 and the top plate 931, and the third driving member 93 maintains an upward movement tendency under the action of the third elastic member 94. In order to make the second and third driving member bodies 81, 930 and the first driving member 71 more assembled, the mounting cavity 712 of the first driving member is opened to a side facing away from the locking hole, and after the mounting cavity 712 is assembled, the bodies 930, 81 are connected to the opening side of the mounting cavity 712 by a side cover 70.

The inner sides of the two side plates 933 are respectively provided with a first driving part 934, the lower side of the first driving part 934 is provided with a driving inclined surface 9341, or/and the upper end surfaces of the two sides of the second locking member body 811 are respectively provided with a driven inclined surface 8111.

In this embodiment, a hole 813 is provided in the middle of two sides of the second locking member 81, so that two sides of the body 811 are separated into an upper section 814 and a lower section 815, and the upper end surfaces of the two sides of the body 811 are the upper end surfaces of the upper section 814. Preferably, the upper end surface of the lower section 815 is also provided with a driven inclined surface 8151, and correspondingly, the inner sides of the two side plates 933 are further provided with a second driving portion 935 in a protruding manner, the second driving portion 935 extends into the hole 813, and the lower side of the second driving portion 935 is also provided with a driving inclined surface 9351.

The specific operation of folding the child cart of the invention is as follows:

The second driving piece 91 is pressed into the pushing handle tube 22, and the third driving piece 93 is driven to move downwards through the interaction of the second driving piece 91 and the corresponding inclined surface on the third driving piece 93; when the third driving member 93 moves downward, the second locking member 81 moves toward the inside of the push handle tube 22 due to the interaction of the driving inclined surface and the driven inclined surface, so that the upper locking portion 8121 of the second locking member 81 is no longer located at the upper end of the support tube 21, the lower locking portion 8122 is also separated from the locking hole 211, the second locking device is unlocked, and the push handle tube 22 can move downward relative to the support tube 21; at this time, the push handle tube 22 is moved downward, the first driving member 71, the third driving member 93 and the second locking member 81 are moved together until the lower side surface of the third driving member 93 pushes the first unlocking member to rotate to unlock the first locking device, at this time, the push handle tube 22 is rotated forward and downward to rotate the entire main bracket 2 around the first rotation shaft 20, so that the rear side of the connecting seat 23 is rotated upward to drive the front side of the first linkage member 4 to also be rotated upward, the first connecting member 32 is pulled forward and upward by the rear side of the first linkage member 4 to be rotated forward and the entire rear bracket 3 is pulled forward and upward to be rotated, and the rear bracket 3 is rotated forward and upward to drive the second linkage member 61 to be rotated together, namely, the rear side of the second linkage wire is rotated forward to drive the third linkage member 62 to be rotated forward, the front side of the forward rotation member 62 is rotated to drive the connecting portion 52 to be rotated, and the connecting portion 52 is positioned at the lower side of the bottom bracket 1 to drive the connecting portion 52 to be rotated upward, as shown in fig. 51 is not rotated forward and the front bracket 22 is rotated upward to be rotated upward, the frame 100 is in a collapsed state (as shown in fig. 23-25). When the frame 100 is in a folded state, the main support 2 and the bottom support 1 are relatively close, and because the rear support 3 rotates forwards and upwards, the first connecting piece 32 is positioned below the bottom support 1, so that the overall height of the rear support 3, the rear wheel 30 and the main support 2 is greatly reduced compared with that in a unfolded state, the upper and lower heights of the frame 100 after being folded can be reduced, the overall volume of the frame 100 after being folded can be reduced, the front wheel 50 also rotates forwards and upwards along with the front support 5, the overall height of the front support 5, the front wheel 50 and the main support 2 is greatly reduced compared with that in a unfolded state, the upper and lower heights of the frame 100 after being folded are further reduced, and the overall volume of the frame 100 after being folded is further reduced, so that the frame is convenient to carry, carry and store.

As described above, when the child stroller frame 100 of the present invention is folded, the main support 2 is rotated downward to link the rear support 3 and the front support 5 to rotate, so that folding operation is very simple and convenient, and the push handle tube 22 is moved downward to unlock the first locking device, so that the overall length of the main support 2 after folding is reduced, the overall volume of the stroller frame 100 after folding is reduced, folding operation is further simplified, the second locking device is unlocked by pressing the second driving member 91, so that the push handle tube 22 can be moved downward, and folding operation is further simplified

In addition, the whole frame 100 of the children's barrow is simple in structure due to the arrangement of the bottom bracket 1, the supporting tube 21, the pushing handle tube 22, the rear bracket 3 and the front bracket 5, so that the children's barrow is small in size and light in weight when being unfolded, is more convenient to use, and can reduce the manufacturing cost.

In this embodiment, the front wheel seat 54 is preferably configured such that the front wheel seat 54 is pivotally connected to the front wheel connecting portion 512 about a vertical axis in the unfolded state of the frame 100. After the folding, the front wheel seat 54 can rotate 90 degrees relative to the front wheel connecting portion 512, so that the front wheel 50 is in a substantially horizontal state with the ground (e.g. the angle of the front wheel 50 in fig. 3 and 23 changes), and thus the overall height of the folding frame 100 can be further reduced, i.e. the overall volume of the folding frame 100 is further reduced. The rotational connection and orientation of the front wheel mount 54 and the front wheel connection 512 may be by any known and feasible technique, and will not be described in detail herein.

As shown in fig. 26, the child stroller of the present invention further comprises a seat 200 coupled to the support pipe 21, and a canopy 300 coupled to the upper side of the push handle pipe 22. The structure of the seat 200 and its connection to the support tube 21, the structure of the roof 300 and its connection to the push handle tube 22 may be any known and feasible technology, and will not be described herein.

The above-mentioned upper, lower, front, rear, left and right directions are defined by taking the conventional use situation as a reference, that is, the direction in which the front wheel 50 is located is the front, the direction in which the rear wheel 30 is located is the rear, the direction in which the push handle is located is the upper, and the directions in which the front wheel 50 and the rear wheel 30 are located are the lower.

It will be appreciated by those skilled in the art that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, merely to facilitate description of the embodiments of the present invention and to simplify the description, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, which will also be correspondingly changed when the viewing vision is changed, and thus should not be construed as limiting the present invention.

The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.

Claims (11)

1. The baby stroller comprises a frame capable of being switched between an unfolding state and a folding state and is characterized by comprising a bottom bracket, a main bracket, a rear bracket and a rear linkage device, wherein the lower side of the main bracket is pivoted to the rear side of the bottom bracket, the front side of the rear bracket is pivoted to the rear side of the bottom bracket, the rear bracket is connected with a rear wheel, one side of the rear linkage device is connected with the main bracket in a matched manner, the other side of the rear linkage device is connected with the rear bracket in a matched manner, and when the main bracket rotates forwards and downwards in the folding process of the frame, the rear linkage device is driven to drive the rear bracket to rotate forwards and upwards.

2. The stroller of claim 1, further comprising a front bracket pivotally connected to the front side of the main bracket, wherein a front wheel is connected to the front bracket, a front linkage is provided between the front bracket and the rear bracket, the front side of the front linkage is connected with the front bracket in a matching manner, the rear side of the front linkage is connected with the rear bracket in a matching manner, and when the rear bracket rotates forwards, the front linkage is driven to drive the front bracket to rotate forwards and upwards.

3. The stroller of claim 2, wherein the lower side of the main support is rotatably pivoted to the bottom support about a first pivot, the front side of the rear linkage is rotatably pivoted to the main support about a second pivot, and the rear side of the rear linkage is pivotally connected to the rear support, and the first pivot is located on the front side or/and the upper side of the second pivot when the stroller frame is in the unfolded state.

4. The stroller of claim 2 or 3, wherein the rear frame comprises a left rear leg and a right rear leg pivotally connected to the left and right sides of the rear side of the main frame, and a first connecting member with the left and right ends connected to the left and right rear legs, respectively, and the rear linkage comprises a left first linkage member and a right first linkage member, the front sides of the first linkage members are pivotally connected to the left and right sides of the main frame, respectively, and the rear sides are pivotally connected to the first connecting members.

5. The stroller of claim 4, wherein the front linkage comprises a left second linkage member, a right second linkage member and a left third linkage member, the front side of the front linkage is pivoted with the front support, the rear side of the front linkage is pivoted with the rear support, the front linkage comprises a left second linkage member, a right second linkage member and a left third linkage member, the left second linkage member and the right third linkage member are respectively connected with two rear legs and can rotate together with the rear legs, the rear sides of the left third linkage member and the right third linkage member are respectively pivoted with the two second linkage members, the front sides of the left third linkage member and the right third linkage member are both pivoted with the front support, and when the stroller frame is in a unfolded state, the pivoted positions of the third linkage members and the second linkage members on the same side are positioned at the rear sides of the positions of the rear legs and the second linkage members.

6. The stroller of claim 5, wherein the front frame comprises a left front leg and a right front leg, the front legs are pivotally connected to the bottom frame, the front ends of the two third link members are pivotally connected to one of the front legs, or the front frame further comprises a connecting portion, the left and right ends of the connecting portion are respectively connected to the left and right front legs and are rotatable together with the two front legs, and the front ends of the two third link members are pivotally connected to the connecting portion.

7. The stroller of claim 5 or 6, wherein the main support comprises a support pipe with a lower end pivoted to the main support, and a push handle pipe with a lower side connected in the support pipe in a relatively up-down movable manner, wherein the lower end of the support pipe is fixedly connected with a connecting seat, and the connecting seat is pivoted to the bottom support.

8. The stroller of claim 7, wherein the bottom bracket is provided with an accommodating cavity with an upward opening at the rear side, the connecting seat is arranged in the accommodating cavity, the side walls of the left side and the right side of the accommodating cavity are arranged at intervals with the side walls of the corresponding side of the bottom bracket, and the first linkage piece, the third linkage piece and the second linkage piece of the corresponding side are sequentially arranged between the side walls of the accommodating cavity and the side walls of the bottom bracket.

9. The stroller of claim 8, wherein a first locking device for limiting the relative rotation of the support tube and the bottom bracket is arranged between the support tube and the bottom bracket, a first driving piece is connected to the lower end of the support tube, and the first locking device and the first driving piece are matched and arranged in a way that the first driving piece moving downwards along with the push handle tube can unlock the first locking device.

10. The stroller of claim 9, wherein the first locking device comprises a first locking member rotatably connected to the connecting seat in a seesaw manner, a first elastic member arranged between the first locking member and the connecting seat, and a locking protrusion protruding from a corresponding side wall of the accommodating cavity, the upper side of the first locking member rotates towards the supporting tube and stretches into the supporting tube under the action of the first elastic member, the lower side rotates towards the direction of the locking protrusion and is buckled on the lower side of the locking protrusion, the first locking device is in a locking state, one side surface of the lower side of the first driving member, which faces the first locking member, is provided with an inclined surface or an arc surface, the first driving member moving downwards along with the pushing handle tube pushes the upper side of the first locking member to rotate reversely through the inclined surface or the arc surface, so that the lower side of the first locking member rotates towards the supporting tube to separate from a hook of the locking protrusion, and the first locking device is unlocked.

11. The stroller of any one of claims 1-3, 5-6, 8-10, further comprising a seat coupled to the support tube.