Baby stroller

Abstract

The stroller comprises a frame capable of being switched between an unfolded state and a folded state, the frame comprises a bottom support, a main support and a rear support, the lower side of the main support is connected to the rear side of the bottom support in a pivoted mode, the front side of the rear support is connected to the rear side of the bottom support in a pivoted mode, and rear wheels are connected to the rear support; the stroller further comprises a rear linkage device, one side of the rear linkage device is connected with the main support in a matched mode, and the other side of the rear linkage device is connected with the rear support in a matched mode. In the folding process of the frame, when the main support rotates towards the lower front portion, the rear linkage device is driven to drive the rear support to rotate towards the upper front portion. After folding, the overall height of the rear support, the rear wheels and the main support is greatly reduced compared with that in an unfolded state, so that the vertical height of the folded frame can be reduced, the overall size of the folded frame can be reduced, and carrying, carrying and storage are facilitated; and the rear bracket can be linked by rotating the main bracket downwards, so that the folding operation is very simple and convenient.

Description

Technical Field

[0001] The present invention relates to the field of infant products, and particularly to a baby stroller. Background Art

[0002] Baby strollers are used for children to sit on, so as to relieve the burden on parents of holding the baby and make it more convenient for parents to travel with the baby.

[0003] A baby stroller generally includes a frame and a seat connected to the frame. For more convenient use, the frame is generally made to be convertible between an unfolded state and a folded state. However, the folding operation of the frame of some baby strollers is very cumbersome, and the volume after folding is relatively large, which is not convenient for carrying, transporting, and storing. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above deficiencies and provide a baby stroller with a simple folding operation and a small volume after folding.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A baby stroller includes a frame that can be converted between an unfolded state and a folded state. The frame includes a bottom bracket, a main bracket pivotally connected to the rear side of the bottom bracket at the lower side, and a rear bracket pivotally connected to the rear side of the bottom bracket at the front side. Rear wheels are connected to the rear bracket. The baby stroller further includes a rear linkage device. One side of the rear linkage device is cooperatively connected with the main bracket, and the other side is cooperatively connected with 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.

[0007] The baby stroller further includes a front bracket pivotally connected to the front side of the main bracket. Front wheels are connected to the front bracket. A front linkage device is provided between the front brackets and the rear bracket. The front side of the front linkage device is cooperatively connected with the front bracket, and the rear side is cooperatively connected with the rear bracket. When the rear bracket rotates forward, the front linkage device is driven to drive the front bracket to rotate forward and upward.

[0008] The lower side of the main bracket is pivotally connected to the bottom bracket by rotating around a first rotation axis. The front side of the rear linkage device is pivotally connected to the main bracket by rotating around a second rotation axis, and the rear side is pivotally connected to the rear bracket. When the frame is in the unfolded state, the first rotation axis is located in front of and / or above the second rotation axis.

[0009] The rear bracket includes left and right rear legs respectively pivotally connected to the left and right sides of the rear side of the main bracket, and a first connecting member with left and right ends respectively connected to the left and right rear legs. The rear linkage device includes left and right first linkage members. The front sides of the two first linkage members are respectively pivotally connected to the left and right sides of the main bracket, and the rear sides are both pivotally connected to the first connecting member.

[0010] The front side of the front linkage device is pivotally connected to the front bracket, and the rear side is pivotally connected to the rear bracket; the front linkage device includes two second linkage members on the left and right and two third linkage members on the left and right; the two second linkage members on the left and right are respectively connected to the two rear legs and can rotate together with the rear legs, the rear sides of the two third linkage members on the left and right are respectively pivotally connected to the two second linkage members, and the front sides are both pivotally connected to the front bracket; when the vehicle frame is in the unfolded state, the pivotal connection position of the third linkage member and the second linkage member on the same side is located behind the connection position of the rear leg and the second linkage member.

[0011] The front bracket includes two front legs on the left and right, and the two front legs are both pivotally connected to the bottom bracket, and the front ends of the two third linkage members are respectively pivotally connected to one of the front legs; or, the front bracket further includes a connecting portion, the left and right ends of the connecting portion are respectively connected to the two front legs on the left and right and can rotate together with the two front legs, and the front ends of the two third linkage members are both pivotally connected to the connecting portion.

[0012] The main bracket includes a support tube whose lower end is pivotally connected to the main bracket, and a push handle tube that is connected to be relatively movable up and down inside the support tube at the lower side, the lower end of the support tube is fixedly connected to a connecting seat, and the connecting seat is pivotally connected to the bottom bracket.

[0013] An accommodation cavity with an upward opening is provided at the rear side of the bottom bracket, and the connecting seat is placed in the accommodation cavity; an accommodation cavity with an upward opening is provided at the rear side of the bottom bracket, and the connecting seat is placed in the accommodation cavity; the side walls on the left and right sides of the accommodation cavity are spaced from the corresponding side walls of the bottom bracket, and the corresponding first linkage member, third linkage member, and second linkage member are sequentially arranged between the side wall of the accommodation cavity and the side wall of the bottom bracket.

[0014] A first locking device for restricting relative rotation between the support tube and the bottom bracket is provided between the support tube and the bottom bracket, the lower end of the support tube is connected with a first driving member, and the first locking device and the first driving member are cooperatively arranged such that: the first driving member moving downward along with the push handle tube can unlock the first locking device.

[0015] The first locking device includes a first locking member rotatably connected to the connecting seat in a seesaw manner up and down, a first elastic member provided between the first locking member and the connecting seat, and a locking protrusion protruding from the corresponding side wall of the accommodation cavity; under the action of the first elastic member, the upper side of the first locking member rotates towards the support tube and extends into the support tube, and the lower side rotates towards the direction where the locking protrusion is located and buckles under the lower side of the locking protrusion, and the first locking device is in a locked state; the lower side of the first driving member facing the first locking member is provided as an inclined surface or an arc surface, and the first driving member moving downward along with the push 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 and moves towards the side where the support tube is located and disengages from the buckling with the locking protrusion, thereby unlocking the first locking device.

[0016] Since the present invention adopts the above technical solution, it has the following beneficial effects:

[0017] 1. When folding, the rear bracket rotates and moves forward and upward, so the overall height of the rear bracket, rear wheel and main bracket is greatly reduced compared with the unfolded state, thus reducing the vertical height after the frame is folded, and further reducing the overall volume after the frame is folded, making the volume of the folded frame smaller and facilitating handling, carrying and storage;

[0018] 2. When folding, the front bracket can also rotate and move forward and upward, further reducing the vertical height after the frame is folded, and further reducing the overall volume after the frame is folded;

[0019] 3. When folding, simply rotating the main bracket downward can drive the rear bracket to move, so the folding operation is very simple; moreover, when the rear bracket rotates forward and upward, it can also drive the front bracket to rotate forward and upward, making the folding operation even simpler;

[0020] 4. Moving the push handle tube downward can unlock the first locking device. In this way, not only the overall length of the main bracket 2 after folding is reduced, further reducing the overall volume after the frame is folded, but also the folding operation is made even simpler;

[0021] 5. Pressing the second driving member can unlock the second locking device so that the push handle tube can move downward, further simplifying the folding operation;

[0022] 6. The overall structure of the frame is simple, and its volume when unfolded is not large and it is light, making it more convenient to use; moreover, the manufacturing cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional plane schematic diagram of the child stroller frame of the present invention in the unfolded state;

[0024] Figure 2 It is a three-dimensional schematic diagram of another angle of the child stroller frame of the present invention in the unfolded state;

[0025] Figure 3 It is a plane schematic diagram of the child stroller frame of the present invention in the unfolded state;

[0026] Figure 4 It is a three-dimensional enlarged schematic diagram from a top view angle of the child stroller frame of the present invention in the unfolded state;

[0027] Figure 5 It is an exploded enlarged schematic diagram of some components of the child stroller frame of the present invention;

[0028] Figure 6Schematic diagram of the combination of the pivot joint seat of the stroller frame and the support tube of the first linkage member 4 according to the present invention;

[0029] Figure 7 For according to Figure 4 Enlarged schematic diagram of part B in

[0030] Figure 8 For according to Figure 7 Exploded enlarged schematic diagram of

[0031] Figure 9 For according to Figure 4 Enlarged schematic diagram of part C in

[0032] Figure 10 For according to Figure 3 Cross-sectional schematic diagram in the A-A direction in

[0033] Figure 11 For according to Figure 10 Enlarged schematic diagram of part D in

[0034] Figure 12 For according to Figure 10 Enlarged schematic diagram of part E in

[0035] Figure 13 For according to Figure 10 Enlarged schematic diagram of part F in

[0036] Figure 14 For according to Figure 13 Exploded enlarged schematic diagram of the components in when not sectioned;

[0037] Figure 15 Enlarged schematic diagram of the locking member of the stroller frame according to the invention;

[0038] Figure 16 Enlarged schematic diagram of the first driving member of the stroller frame according to the invention;

[0039] Figure 17 Enlarged schematic diagram of the main body of the third driving member of the stroller frame according to the invention;

[0040] Figure 18 Enlarged combined schematic diagram of the third driving member and the locking member of the stroller frame according to the invention;

[0041] Figure 19 Enlarged combined schematic diagram of the first driving member and the main body of the third driving member of the stroller frame according to the invention;

[0042] Figure 20 Cross-sectional schematic diagram of the stroller frame according to the present invention during the folding process;

[0043] Figure 21 For according to Figure 20Enlarged schematic view of part G in China;

[0044] Figure 22 Is a plan view of the stroller frame of the present invention during the folding process;

[0045] Figure 23 Is a plan view of the stroller frame of the present invention in the folded state;

[0046] Figure 24 Is a plan view of another angle of the stroller frame of the present invention in the folded state;

[0047] Figure 25 Is a three-dimensional view of the stroller frame of the present invention in the folded state;

[0048] Figure 26 Is a three-dimensional view of the stroller frame of the present invention connected with a seat and a canopy. Detailed implementation manners

[0049] As Figures 1 to 9 Shown, the present invention discloses a stroller, which includes a frame 100 that can be switched between an unfolded state and a folded state. The frame 100 includes a bottom bracket 1, a main bracket 2 pivotally connected to the rear side of the bottom bracket 1 at the lower side, and a rear bracket 3 pivotally connected to the rear side of the bottom bracket 1 at the front side. A rear wheel 30 is connected to the rear bracket 3. The stroller further includes a rear linkage device. One side of the rear linkage device is cooperatively connected with the main bracket 2, and the other side is cooperatively connected with the rear bracket 3. During the folding process of the frame 100, when the main bracket 2 rotates forward and downward, the rear linkage device is driven to drive the rear bracket 3 to rotate forward and upward.

[0050] In this embodiment, the lower side of the main bracket 2 is pivotally connected to the bottom bracket 1 by rotating around a first rotating shaft 20. The front side of the rear linkage device is pivotally connected to the main bracket 2 by rotating around a second rotating shaft 201, and the rear side is pivotally connected to the rear bracket 3. When the frame 100 is in the unfolded state, the first rotating shaft 20 is located in front of and / or above the second rotating shaft 201. Thus, during the folding process, when the main bracket 2 rotates forward and downward around the first rotating shaft 20, it can pull the front side of the rear linkage device to rotate upward and move, so that the rear side of the rear linkage device will pull the rear bracket 3 to rotate forward and move.

[0051] The rear support 3 includes left and right rear legs 31 respectively pivotally connected to the left and right sides of the rear of the main support 2, and a first connecting member 32 with its left and right ends respectively connected to the left and right rear legs; the rear linkage device includes a first linkage member 4, the front side of the first linkage member 4 is pivotally connected to the main support 2, and the rear side is pivotally connected to the first connecting member 32, that is, the front side of the first linkage member 4 is pivotally connected to the main support 2 rotatably around the rotating shaft two 201. Thus, when the main support 2 rotates forward and downward around the rotating shaft one 20, it will pull the front side of the first linkage member 4 to rotate upward and move, so that the first connecting member 32 will be pulled by the rear side of the first linkage member 4 to rotate forward and upward, and then the entire rear support 3 is pulled to rotate forward and upward. When the vehicle frame 100 is in the unfolded state, the first connecting member 32 is located behind the bottom support 1.

[0052] 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 pivotally connected to the left and right sides of the main support 2, and the rear sides are both pivotally connected to the first connecting member 32.

[0053] The rear wheels 30 are connected to the sides of the left and right rear legs 31 away from the bottom support 1.

[0054] The baby stroller further includes a front support 5 pivotally connected to the front side of the main support 2, and a front wheel 50 is connected to the front support 5; a front linkage device is provided between the front supports 5 and the rear support 3, the front side of the front linkage device is cooperatively connected to the front support 5, and the rear side is cooperatively connected to the rear support 3; when the rear support 3 rotates forward, the front linkage device is driven to drive the front support 5 to rotate forward and upward.

[0055] In this embodiment, the front side of the front linkage device is pivotally connected to the front support 5, and the rear side is pivotally connected to the rear support 3. Specifically, the front linkage device includes two left and right second linkage members 61 and two left and right third linkage members 62; the two left and right second linkage members 61 are respectively connected to the two rear legs 31 and can rotate together with the rear legs 31, the rear sides of the two left and right third linkage members 62 are respectively pivotally connected to the two second linkage members 61, and the front sides are both pivotally connected to the front support 5; when the vehicle frame 100 is in the unfolded state, the pivotal connection position of the third linkage member 62 and the second linkage member 61 on the same side is located behind the connection position of the rear leg 31 and the second linkage member 61. With such a setting, when the rear leg 31 rotates forward, the second linkage member 61 rotates forward together therewith, thus driving the third linkage member 62 to also rotate forward and move, and then the third linkage member 62 can drive the front support 5 to rotate relative to the bottom support 1.

[0056] The bottom bracket 1 includes a top wall 11 and a side wall 12 extending downward from the outer edge of the top wall 11, and the two rear legs 31 are respectively pivoted to the outer sides of the side walls 12 on the corresponding sides. Specifically, the side of the rear leg 31 facing the side wall 12 is connected with a pivot 311 that can rotate therewith, and the end of the pivot 311 away from the rear leg 31 can be relatively rotatably penetrated from the outside to the inside of the side wall 12; the second linkage 61 is located on the inner side of the side wall 12 and is relatively fixedly connected to the pivot 311, and the third linkage 62 is also located on the inner side of the side wall 12. And the second linkage 61 is located between the third linkage 62 and the side wall 12, so as to facilitate the assembly of the second linkage 61 and the third linkage 62.

[0057] The second linkage member 61 includes a connecting section 611 connected to the pivot 311, and a pivoting section 612 extending from the connecting section 611 to the rear side, and the rear side of the third linkage member 62 is pivotally connected to the pivoting section 612. In this embodiment, a receiving groove 120 is provided on the inner side of the side wall 12, and the connecting section 611 is relatively fixedly sleeved on the outside of the pivot 311, and the connecting section 611 is at least partially rotatably placed in the receiving groove 120, and the connecting member is located outside the receiving groove 120. A first positioning member 13 has a middle portion spanning the lower side of the connecting section 611, and both ends of the first positioning member 13 are connected to the bottom wall of the side wall of the receiving groove 120. In this way, the connecting section 611 can only rotate within the space defined by the accommodating groove 120 and the first positioning member 13, thereby not only ensuring the stability of the pivot connection between the rear foot 31 and the connecting section 611, but also ensuring the stability of the function of the second linkage member 61 to drive the third linkage member 62 when rotating, thereby ensuring the stability of the linked rotation function of the front bracket 5.

[0058] Furthermore, one side of the axial direction of the pivot 311 is set as a straight surface 3110, and correspondingly, one side of the axial direction of the inner hole of the connecting section 611 is also set as a straight surface, so that when the connecting section 611 is sleeved outside the pivot 311, it is straight against the straight surface, so that when the pivot 311 rotates with the rear foot 31, the second linkage member 61 will rotate together. In addition, the pivot 311 and the second linkage member 61 can be connected by screws or rivets, so that the connection between the two is more stable, ensuring that when the rear foot 31 rotates, it can definitely drive the second linkage member 61 to rotate, and then the front bracket 5 can be driven to rotate through the second linkage member 61 and the third linkage member 62.

[0059] The side wall 12 at the rear side of the bottom bracket 1 has a slot 122 opening downward at a position corresponding to the first linkage member 4, and the front side of the first linkage member 4 extends into the side wall 12 through the slot 122 and is pivotally connected to the main bracket 2. Because the slot 122 opens downward, the rotation movement of the first linkage member 4 will not be hindered when folding.

[0060] The front support 5 includes two left and right front legs 51 . The two front legs 51 are both pivotally connected to the bottom support 1 . Each front leg 51 is connected to the front wheel 50 .

[0061] In this embodiment, the front bracket 5 further includes a connecting portion 52, the left and right ends of which are respectively connected to the left and right front legs 51 and can rotate together with the two front legs 51, and the front ends of the two third linkage members 62 are both pivotally connected to the connecting portion 52. In this way, the rotation of the two front legs 51 relative to the bottom bracket 1 can be made more synchronous.

[0062] The opposite ends of the left and right front feet 51 (i.e., the right end of the left front foot 51 and the left end of the right front foot 51) are fixedly connected to the left and right ends of the connecting portion 52. The fixed connection can be an integrally formed manner, i.e., the two front feet 51 and the connecting portion 52 are integrally formed, or a fixed connection manner via a fixing member (such as a screw, etc.), as long as the connecting portion 52 can rotate together with the two front feet 51.

[0063] In other embodiments, the connecting portion 52 may not be provided, and the front ends of the two third linkage members 62 are directly pivotally connected to one of the front legs 51 respectively.

[0064] In this embodiment, each of the front legs 51 is provided with a pivoting portion 511, and correspondingly, the left and right sides of the front side of the bottom bracket 1 are respectively provided with pivoting grooves 15, and the pivoting portion 511 on the same side is at least partially rotatable in the pivoting groove 15. During assembly, one side of the pivoting portion 511 is placed in the pivoting groove 15, and the middle part of a second positioning member 14 spans the side of the pivoting portion 511 away from the bottom bracket 1, and the two ends of the second positioning member 14 are fixedly connected to the main bracket 2. In this way, the pivoting portion 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 pivoting groove 15 with the opening facing downward, and the middle part of the second positioning member 14 spans the lower side of the pivoting portion 511, and the two ends of the second positioning member 14 are fixedly connected to the lower side of the main bracket 2.

[0065] Preferably, the center lines of the pivoting parts 511 of the left and right front legs 51 are on the same straight line or parallel to each other, and correspondingly, the center lines of the pivoting slots 15 of the left and right front legs 5 are also on the same straight line or parallel to each other. That is to say, if one of the front legs 51 is pivoted to the main support 2 around the rotation axis 4, and the other front leg 51 is pivoted to the main support 2 around the rotation axis 5, then the center lines of the rotation axis 4 and the rotation axis 5 are on the same straight line or parallel to each other. In this way, the problem that the two front legs 51 cannot rotate relative to the main support 2 at the same time can be avoided. In this embodiment, the center lines of the pivoting parts 511 of the left and right front legs 51 are on the same straight line.

[0066] Preferably, the left and right third linkage members 62 are also fixedly connected to the left and right sides of at least one second connecting member 63. In this embodiment, there are two second connecting members 63 arranged front and back, and the left and right ends of each second connecting member 63 are respectively connected to the two third linkage members 62. With such an arrangement, the synchronous rotation and movement of the two third linkage members 62 are further ensured, and the uniformity of the driving force received by the front bracket 5 is also ensured, thereby further ensuring the synchronism of the rotation of the two front feet 51. Preferably, the two second connecting members 63 are arranged parallel to each other front and back, and the fixed connection method between the second connecting member 63 and the third linkage member 62 can be any known and feasible structure.

[0067] Each of the front feet 51 is further provided with a front wheel connecting portion 512, and each front wheel connecting portion 512 is connected to a front wheel seat 54, and the front wheel 50 is connected to the front wheel seat 54. The connection method between the front wheel seat 54 and the front wheel 50 is a well-known technology, so it will not be elaborated here.

[0068] The main bracket 2 includes a support tube 21 pivotally connected to the lower end of the main bracket 2, and a push handle tube 22 movably connected up and down relative to the lower side within the support tube 21. The front side of the rear linkage device is pivotally connected to the support tube 21. In this embodiment, the lower end of the support tube 21 is fixedly connected to a connection seat 23, and the connection seat 23 is pivotally connected to the bottom bracket 1, that is, the connection seat 23 is pivotally connected to the bottom bracket 1 by rotating around the first rotating shaft 20. The front sides of the two first linkage members 4 are pivotally connected to the connection seat 23, that is, the front sides of the two first linkage members 4 are respectively pivotally connected to the left and right sides of the connection seat 23. The front side of the connection seat 23 is pivotally connected to the bottom bracket 1, and a receiving hole 231 is provided at the rear side. The lower side of the support tube 21 is placed within the receiving hole 231.

[0069] The rear side of the bottom bracket 1 is provided with a receiving cavity 16 with an upward opening. The connection seat 23 is placed within the receiving cavity 16, and the front side of the connection seat 23 is pivotally connected to the left and right side walls 12 of the front side of the receiving cavity 16 through the first rotating shaft 20. The side walls 161 on the left and right sides of the receiving cavity 16 are each provided with a notch 162 with an upward opening. The front sides of the two first linkage members 4 are respectively located outside the left and right side walls 12 of the receiving cavity 16 and are pivotally connected to the connection seat 23 at the notch position. Thus, when the connection seat 23 rotates around the first rotating shaft 20, the front sides of the first linkage members 4 can be driven to rotate and move upward without being blocked.

[0070] The side walls 161 on the left and right sides of the receiving cavity 16 are spaced from the corresponding side walls 12 of the bottom bracket 1. The corresponding first linkage members 4, third linkage members 62, and second linkage members 61 are sequentially arranged between the side wall of the receiving cavity 16 and the side wall 12 of the bottom bracket 1, so that the overall structure is more compact and the layout is more reasonable.

[0071] The rear side wall of the accommodation cavity 16 may be spaced from the rear side wall of the bottom bracket 1 and located on the front side of the rear side wall of the bottom bracket 1; alternatively, the rear side wall of the accommodation cavity 16 may be integral with the rear side wall of the bottom bracket 1.

[0072] Combined with Figure 10 、 11 As shown, a first locking device for restricting relative rotation between the support tube 21 and the bottom bracket 1 is provided therebetween. The lower end of the support tube 21 is connected to a first driving member 71, and the first locking device and the first driving member 71 are configured such that the first driving member 71 moving downward along with the push handle tube 22 can unlock the first locking device.

[0073] The first locking device includes a first locking member 72 rotatably connected to the connecting seat 23 in a seesaw manner up and down, a first elastic member 73 disposed between the first locking member 72 and the connecting seat 23, and a locking protrusion 161 protruding from the corresponding side wall 12 of the accommodation cavity 16. A through hole (not shown in the figure) is provided on the tube wall of the support tube 21 at a position corresponding to the first locking member 72, and a through hole 232 is also provided in the receiving hole 231 at a position corresponding to the first locking member 72; under the action of the first elastic member 73, the upper side of the first locking member 72 rotates towards the support tube 21 and extends into the support tube 21 through the through hole, and the lower side rotates towards the direction where the locking protrusion 161 is located and extends out of the connecting seat 23 through the through hole 232 and buckles under the lower side of the locking protrusion 161, and the first locking device is in a locked state. Thus, the locking protrusion 161 will block the upward rotation of the first locking member 72, so that the main bracket 2 cannot rotate forward and downward. The first locking member 72 is rotatably connected to the rear side of the connecting seat 23 around a rotating shaft three 721.

[0074] One side surface of the lower side of the first driving member 71 facing the first locking member 72 is provided as an inclined surface or an arc surface 710. The first driving member 71 moving downward along with the push handle tube 22 pushes the upper side of the first locking member 72 to rotate in the reverse direction through this inclined surface or arc surface. Thus, the lower side of the first locking member 72 will rotate and move towards the side where the support tube 21 is located and disengage from the hook of the locking protrusion 161 (as Figure 20 、 21As shown, the first locking device is unlocked, 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 set as an inclined surface or an arc surface, so that the first driving member 71 can drive the first locking member 72 more smoothly. Specifically, when the first driving member 71 moves downward with the push handle tube 22 until its inclined surface or arc surface contacts the upper side of the first locking member 72, when the first driving member 71 continues to move downward, it will push the upper side of the first locking member 72 to rotate reversely.

[0075] In this embodiment, the first locking member 72 is rotatably connected to the rear side of the connecting seat 23. Therefore, under the action of the first elastic member 73, the upper side of the first locking member 72 rotates forward, and the lower side rotates backward and buckles under the lower side of the locking protrusion 161. When driven by the first driving member 71, the upper side of the first locking member 72 rotates backward, and the lower side rotates forward and disengages from the locking protrusion 161.

[0076] As Figures 13 to 19 shown, a second locking device for restricting the relative up and down movement between the push handle tube 22 and the support tube 21 is provided. The push handle tube 22 can only be moved downward after the second locking device is unlocked.

[0077] The second locking device includes a second locking member 81 movably connected to the push handle tube 22, a second elastic member 82 disposed between the second locking member 81 and the push handle tube 22, and a matching portion disposed on the support tube 21. Under the action of the second elastic member 82, the second locking member 81 cooperates with the matching portion, and the second locking device is in a locked state, and the push handle tube 22 cannot move up and down relative to the support tube 21.

[0078] The second locking member 81 includes a main body 811 and a locking member 812 disposed on one side of the main body 811. In this embodiment, the locking member 812 includes an upper locking portion 8121 and a lower locking portion 8122 spaced up and down on one side of the main body 811; the locking portion 812 includes a locking hole 211 provided on the tube wall of the support tube 21 and the upper end wall of the support tube 21, and corresponding upper and lower through holes are provided on the tube wall of the push handle tube 22; under the action of the second elastic member 82, the second locking member 81 moves toward the direction where the first locking hole 211 is located. The upper locking portion 8121 passes through the upper through hole and is located at the upper end of the support tube 21, and the lower locking portion 8122 passes through the lower through hole and is stuck in the locking hole 211. The second locking device is in a locked state, so that the second locking member 81 cannot move up and down, and further the push handle cannot move up and down relative to the support tube 21.

[0079] In other embodiments, it may also be that the mating part includes two locking holes 211 provided on the wall of the upper and lower support tubes 21, and the upper locking part 8121 and the lower locking part 8122 of the second locking member 81 are respectively snapped into the two upper and lower locking holes 211; alternatively, only one locking hole 211 is provided on the wall of the support tube 21, and only one locking part 812 is provided, and this one locking part 812 is snapped into this one locking hole 211. In this way, the second locking member 81 cannot move up and down either. So that the push handle cannot move up and down relative to the support tube 21.

[0080] The upper side of the first driving member 71 is fixedly connected to the inner side of the lower side of the push handle tube 22, and an installation cavity 712 is provided inside the upper side of the first driving member 71. Upper limit parts 713 and lower limit parts 714 are arranged at intervals on the inner wall of the installation cavity 712. The second locking member 81 is movably disposed between the upper limit part 713 and the lower limit part 714; corresponding to the locking part 812 of the second locking member 81, through holes 715 for the locking part 812 to pass through are provided on both the cavity wall of the installation cavity 712 and the wall of the push handle tube 22.

[0081] An unlocking device for unlocking the second locking device is provided on the push handle tube 22. In combination Figure 10 、 12 As shown, in this embodiment, the unlocking device includes a second driving member 91 movably connected to the upper side of the push handle and a third driving member 93 movably connected up and down inside the push handle tube 22. The upper side of the third driving member 93 is cooperatively arranged with the second driving member 91, and the lower side is cooperatively arranged with the locking member. The second driving member 91 is driven 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 away from the locking part 812, thereby unlocking the second locking device.

[0082] 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. One end face of the side of the second driving member 91 located inside the push handle tube 22 is provided as an inclined surface 911, or / and, one side of the upper side of the third driving member 93 facing the second driving member 91 is also provided as an inclined surface 931. In this embodiment, preferably, inclined surfaces are provided on both the second driving member 91 and the third driving member 93 for cooperation.

[0083] The lower end of the third driving member 93 is provided with a main body 930 which can be relatively moved up and down and is located in the installation cavity 712. The main body 930 is in a square frame shape, including a top plate 931, a bottom plate 932, and two side plates 933 respectively connected to the top plate 931 and the bottom plate 932. The upper limit portion 713 and the lower limit portion 714 extend between the top wall 11 and the bottom wall; that is, the top plate 931 of the square frame-shaped main body 930 is located between the upper limit portion 713 and the top wall 11 of the installation cavity, and the bottom plate 932 is located between the lower limit portion 714 and the bottom wall of the installation cavity 712. A third elastic member 94 is provided between the upper limit portion 713 and the top plate 931. Under the action of the third elastic member 94, the third driving member 93 maintains a tendency to move upward. In order to better assemble the second locking member 81, the third driving member main body 930 and the first driving member 71, the installation cavity 712 of the first driving member is opened to the side away from the locking hole. After the main body 930 and the second locking member 81 are installed in the installation cavity 712, a side cover 70 is used to connect to the open side of the installation cavity 712.

[0084] The inner sides of the two side plates 933 are both protruding with a first driving portion 934 , the lower side of the first driving portion 934 is set as a driving inclined surface 9341 , or / and, the upper end surfaces on both sides of the second locking member body 811 are both set as driven inclined surfaces 8111 .

[0085] In this embodiment, the middle of both sides of the second locking member 81 is provided with a notch 813, so that both sides of the body 811 are divided into an upper section 814 and a lower section 815, and the upper end surfaces of both 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 as a driven inclined surface 8151, and correspondingly, the inner side of the two side plates 933 is also provided with a second driving part 935, the second driving part 935 extends into the notch 813, and the lower side of the second driving part 935 is also provided as a driving inclined surface 9351.

[0086] The specific operation of folding the stroller of the present invention is as follows:

[0087] Press the second driving member 91 into the push handle tube 22. Through the interaction of the corresponding inclined surfaces on the second driving member 91 and the third driving member 93, the third driving member 93 is driven to move downward; when the third driving member 93 moves downward, through the interaction of the driving inclined surface and the driven inclined surface, the second locking member 81 moves into the push handle tube 22. As a result, the upper locking portion 8121 of the second locking member 81 is no longer located at the upper end of the support tube 21, and the lower locking portion 8122 also disengages 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, move the push handle tube 22 downward, and the first driving member 71, the third driving member 93, and the second locking member 81 move together until the lower side surface of the third driving member 93 pushes the first unlocking member to rotate and unlock the first locking device; at this time, rotate the push handle tube 22 forward and downward, so that the entire main bracket 2 rotates around the first rotating shaft 20. In this way, the rear side of the connecting seat 23 rotates upward, thereby driving the front side of the first linkage 4 to also rotate upward; the first connecting member 32 is pulled by the rear side of the first linkage 4 and rotates forward and upward, and then the entire rear bracket 3 is pulled to rotate forward and upward; when the rear bracket 3 rotates forward and upward, the second linkage 61 rotates together, that is, the rear side of the second linkage rotates forward, thereby driving the third linkage 62 to rotate forward. The front side of the third linkage 62 that rotates forward will drive the connecting portion 52 to rotate. And because the connecting portion 52 is located below the bottom bracket 1, the connecting portion 52 will be driven to rotate downward at this time, so that the front foot 51 rotates forward and upward (as Figure 22 shown); until the push handle tube 22 can no longer rotate downward, the vehicle frame 100 is in the folded state (as Figures 23 to 25 shown). When the vehicle frame 100 is in the folded state, the main bracket 2 and the bottom bracket 1 are relatively close to each other. Because the rear bracket 3 rotates forward and upward and the first connecting member 32 is located below the bottom bracket 1, the overall height of the rear bracket 3, the rear wheel 30, and the main bracket 2 is greatly reduced compared to the unfolded state, so that the vertical height of the vehicle frame 100 after folding can be reduced, and then the overall volume of the vehicle frame 100 after folding can be reduced; moreover, the front wheel 50 also rotates forward and upward with the front bracket 5, so that the overall height of the front bracket 5, the front wheel 50, and the main bracket 2 is also greatly reduced compared to the unfolded state; thus, the vertical height of the vehicle frame 100 after folding is further reduced, and the overall volume of the vehicle frame 100 after folding is further reduced, which is convenient for handling, carrying, and storing.

[0088] As described above, when folding the stroller frame 100 of the present invention, the rear frame 3 and the front frame 5 can be rotated in conjunction with the main frame 2 by rotating downward, so that the folding operation is very simple; and the first locking device can be unlocked by moving the handlebar tube 22 downward, so that not only the overall length of the main frame 2 after folding is reduced, and thus the overall volume of the folded frame 100 is reduced, but also the folding operation is further simplified; pressing the second driving member 91 can unlock the second locking device so that the handlebar tube 22 can move downward, thereby further simplifying the folding operation.

[0089] Furthermore, because the overall structure of the frame 100 adopts the arrangement of a bottom bracket 1 + a support tube 21 + a handlebar tube 22 + the above-mentioned rear bracket 3 + the above-mentioned front bracket 5, the overall structure of the frame 100 of the child stroller of the present invention is simple, so that the volume thereof is small and light when unfolded, thereby being more convenient to use; and the manufacturing cost can also be reduced.

[0090] In this embodiment, preferably, the front wheel seat 54 is configured such that when the frame 100 is unfolded, the front wheel seat 54 is pivotally connected to the front wheel connecting portion 512 so as to be rotatable about a vertical axis. With such a configuration, after being folded, the front wheel seat 54 can be rotated 90 degrees relative to the front wheel connecting portion 512, so that the entire front wheel 50 is in a state substantially horizontal to the ground (e.g. Figure 3 and Figure 23 The front wheel 50 angle changes), so that the overall height of the frame 100 after folding can be further reduced, that is, the overall volume of the frame 100 after folding can be further reduced. The rotation connection and orientation of the front wheel seat 54 and the front wheel connecting part 512 can adopt any known and feasible technology, so it is not repeated here.

[0091] like Figure 26 As shown, the stroller of the present invention further comprises a seat 200 connected to the support tube 21, and a canopy 300 connected to the upper side of the handle tube 22. The structure of the seat 200 and its connection with the support tube 21, and the structure of the canopy 300 and its connection with the handle tube 22 can be any known and feasible technology, which is not the inventive point of the present invention and will not be described here.

[0092] The above-mentioned definitions of up, down, front, back, left, and right directions are based on normal usage conditions, that is, the direction of the front wheel 50 is the front, the direction of the rear wheel 30 is the rear, the direction of the handlebar is the top, and the direction of the front wheel 50 and the rear wheel 30 is the bottom.

[0093] Those skilled in the art should understand that the orientation or positional relationship indicated by the above terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. When the viewing vision changes, the above orientation or positional relationship will also change accordingly. Therefore, it should not be construed as a limitation to the present invention.

[0094] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiments of the present invention and cannot be considered as used to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A baby stroller, comprising a frame that can be switched between an unfolded state and a folded state, characterized in that: The frame includes a bottom bracket, a main bracket pivotally connected to the rear side of the bottom bracket at the lower side, and a rear bracket pivotally connected to the rear side of the bottom bracket at the front side. A rear wheel is connected to the rear bracket. The baby stroller further includes a rear linkage device, one side of the rear linkage device is cooperatively connected to the main bracket, and the other side is cooperatively 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.

2. The stroller for children according to claim 1, wherein: It further includes a front bracket pivotally connected to the front side of the main bracket. A front wheel is connected to the front bracket. A front linkage device is arranged between the front brackets and between the rear brackets. The front side of the front linkage device is cooperatively connected to the front bracket, and the rear side is cooperatively connected to the rear bracket. When the rear bracket rotates forward, the front linkage device is driven to drive the front bracket to rotate forward and upward.

3. The stroller for children according to claim 2, characterized in that: The lower side of the main bracket is pivotally connected to the bottom bracket by rotating around a first rotating shaft. The front side of the rear linkage device is pivotally connected to the main bracket by rotating around a second rotating shaft, and the rear side is pivotally connected to the rear bracket. When the frame is in the unfolded state, the first rotating shaft is located at the front side or / and the upper side of the second rotating shaft.

4. The stroller for children according to claim 2 or 3, characterized in that: The rear bracket includes left and right rear legs respectively pivotally connected to the left and right sides of the rear side of the main bracket, and a first connecting member with left and right ends respectively connected to the left and right rear legs. The rear linkage device includes left and right first linkage members. The front sides of the two first linkage members are respectively pivotally connected to the left and right sides of the main bracket, and the rear sides are both pivotally connected to the first connecting member.

5. The stroller for children according to claim 4, characterized in that: The front side of the front linkage device is pivotally connected to the front bracket, and the rear side is pivotally connected to the rear bracket. The front linkage device includes left and right second linkage members and left and right third linkage members. The left and right second linkage members are respectively connected to the two rear legs and can rotate together with the rear legs. The rear sides of the left and right third linkage members are respectively pivotally connected to the two second linkage members, and the front sides are both pivotally connected to the front bracket. When the frame is in the unfolded state, the pivotal connection position of the third linkage member and the second linkage member on the same side is located at the rear side of the connection position between the rear leg and the second linkage member.

6. The stroller for children according to claim 5, characterized in that: The front bracket includes left and right front legs. The two front legs are both pivotally connected to the bottom bracket, and the front ends of the two third linkage members are respectively pivotally connected to one of the front legs; or, the front bracket further includes a connecting portion, the left and right ends of the connecting portion are respectively connected to the left and right front legs and can rotate together with the two front legs, and the front ends of the two third linkage members are both pivotally connected to the connecting portion.

7. The stroller for children according to claim 5 or 6, characterized in that: The main bracket includes a support tube pivotally connected to the lower end of the main bracket, and a push handle tube connected to be relatively movable up and down inside the support tube at the lower side. The lower end of the support tube is fixedly connected to a connecting seat, and the connecting seat is pivotally connected to the bottom bracket.

8. The stroller for children according to claim 7, characterized in that: An accommodation cavity with an upward opening is arranged at the rear side of the bottom bracket. The connecting seat is placed in the accommodation cavity; an accommodation cavity with an upward opening is arranged at the rear side of the bottom bracket. The connecting seat is placed in the accommodation cavity; the side walls on the left and right sides of the accommodation cavity are spaced from the corresponding side walls of the bottom bracket, and the corresponding first linkage member, third linkage member, and second linkage member are sequentially arranged between the side wall of the accommodation cavity and the side wall of the bottom bracket.

9. The stroller for children according to claim 8, characterized in that: A first locking device for restricting relative rotation between the support tube and the bottom bracket is provided. A first driving member is connected to the lower end of the support tube, and the first locking device and the first driving member are configured such that the first driving member moving downward with the push handle tube can unlock the first locking device.

10. The stroller for children according to claim 9, characterized in that: The first locking device includes a first locking member rotatably connected to the connecting seat in a seesaw manner up and down, a first elastic member disposed between the first locking member and the connecting seat, and a locking protrusion protruding from the corresponding side wall of the accommodation cavity. Under the action of the first elastic member, the upper side of the first locking member rotates towards the support tube and extends into the support tube, and the lower side rotates towards the direction where the locking protrusion is located and buckles under the locking protrusion, and the first locking device is in a locked state. The lower side of the first driving member facing the first locking member is provided with an inclined surface or an arc surface. The first driving member moving downward with the push 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 and moves towards the side where the support tube is located and disengages from the buckling with the locking protrusion, thereby unlocking the first locking device.

11. The stroller for children according to any one of claims 1 to 3, 5 to 6, and 8 to 10, characterized in that: It further includes a seat connected to the support tube.

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