Stroller frame and child stroller

Abstract

The invention belongs to the technical field of stroller, and discloses a stroller frame and a stroller. The stroller frame comprises two side supports oppositely arranged in the first direction, a cross brace and a joint. The transverse support is supported between the two side supports. The joint comprises a first joint seat, a second joint seat and a first locking piece, the second joint seat is fixed to the side support, the first joint seat is fixed to the cross brace, and the first joint seat is rotationally connected with the second joint seat; the first joint seat is provided with a first groove section, the second joint seat is provided with a second groove section, the first groove section and the second groove section can be communicated to form a first locking groove, the first locking piece comprises a first locking part, and the first locking part is arranged in the first locking groove in a sliding mode in the first direction; and in the first direction, the area of at least part of the cross section of the first locking part and / or the first locking groove is gradually reduced, so that the gap of the joint is eliminated, and the shaking amount of the joint is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of child strollers, and in particular to a stroller frame and a child stroller. Background Art

[0002] Usually, people use strollers to take children to outdoor activities to provide children with travel convenience. With the development of technology, there are higher requirements for the stability and ease of operation of strollers. A stroller generally includes a stroller frame and a seat assembly, and the seat assembly is arranged on the stroller frame. In order to facilitate storage and carrying, the stroller frame is generally arranged in a foldable structure, resulting in a large number of joints in the stroller frame, and the joints need to be locked when the stroller frame is in an unfolded state.

[0003] Most of the existing joints have joint teeth, and a tooth groove ring is provided in the joint seat. When the joint teeth are meshed with the tooth groove rings of the two joint seats, locking is achieved. In order to ensure that the joint can be unlocked smoothly, there needs to be a certain gap between the teeth on the joint teeth and the tooth grooves on the tooth groove ring to ensure that the teeth can be smoothly withdrawn from the tooth grooves, which leads to some shaking gaps in the joints. When there are many joints in the cart frame, the stability of the cart frame is poor.

[0004] Therefore, there is an urgent need for a stroller frame and a child stroller to solve the above problems existing in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a stroller frame and a child stroller, which can eliminate the gap between joints, reduce the shaking amount of joints, and improve the stability when the joints are locked, thereby improving the stability of the stroller frame and the child stroller.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A cart frame, comprising:

[0008] Two side brackets arranged opposite to each other along a first direction;

[0009] A cross brace supported between the two side brackets;

[0010] The joint comprises a first joint seat, a second joint seat and a first locking member, wherein the second joint seat is fixed to the side bracket, the first joint seat is fixed to the cross brace, and the first joint seat is rotatably connected to the second joint seat;

[0011] The first joint seat is provided with a first groove section, the second joint seat is provided with a second groove section, the first groove section and the second groove section can be connected to form a first locking groove, the first locking member includes a first locking portion, and the first locking portion is slidably disposed in the first locking groove along a first direction;

[0012] Along the first direction, at least a portion of the cross-sectional area of ​​the first locking portion and / or the first locking groove gradually decreases.

[0013] As an optional solution for the above-mentioned cart frame, the cart frame also includes a seat supporting mechanism movably arranged on the cross brace, so that the seat supporting mechanism can switch between a use position and a non-use position. When the seat supporting mechanism moves to the use position, the seat supporting mechanism engages with the first locking member and pushes the first locking member to move toward the first locking groove to lock the second joint seat and the first joint seat.

[0014] As an optional solution of the above-mentioned stroller frame, the first locking member also includes a first locking body, the first locking portion is fixedly arranged on the first locking body, the first locking body is movably arranged on a side of the first joint seat facing the seat supporting mechanism, the first locking portion penetrates the first joint seat and extends in the first groove section, and when the seat supporting mechanism moves to the use position, it abuts against the first locking body and pushes the first locking body to move in a direction close to the first joint seat;

[0015] The cart frame also includes a first reset member, which is arranged between the first locking body and the first joint seat. Under the action of external force, the first locking body moves toward the direction close to the first joint seat, and the first reset member is deformed to accumulate rebound force; after the external force is removed, the first reset member drives the first locking body to reset and move to drive the first locking part to move away from the first locking groove.

[0016] As an optional solution of the above-mentioned cart frame, along the direction from the first joint seat to the second joint seat, the cross-sectional area of ​​the first locking groove gradually decreases, and the shape of the first locking portion is adapted to the shape of the first locking groove;

[0017] Or, along the direction from the first joint seat to the second joint seat, the cross-sectional area of ​​at least one of the first locking portion and the first slot segment gradually decreases, and the cross-sectional area of ​​at least one of the first locking portion and the second slot segment gradually decreases.

[0018] As an optional solution of the above-mentioned cart frame, a first joint cavity is formed between the first joint seat and the second joint seat, and a first tooth groove is provided on the inner wall of the first joint cavity, and the first tooth groove extends to the first joint seat and the second joint seat at both ends along the first direction;

[0019] A second locking piece is slidably disposed in the first joint cavity along the first direction. The second locking piece includes a second locking portion. The second locking portion slidably cooperates with the first tooth groove to lock or unlock the second joint seat and the first joint seat.

[0020] As an optional solution of the above-mentioned cart frame, the second locking portion is matched with the first tooth groove clearance along the circumference of the first joint cavity;

[0021] And / or, when the first joint seat and the second joint seat are locked, the first locking grooves and the first tooth grooves are alternately arranged along the circumference of the first joint cavity.

[0022] As an optional solution of the above-mentioned cart frame, the joint further includes a second reset member, the second reset member is connected to or abuts against the second locking member, and the second reset member is used to drive the second locking member to slide in the direction of locking the second joint seat and the first joint seat; the elastic force of the second reset member is directed from the second joint seat to the first joint seat along the first direction;

[0023] And / or, a plurality of second locking portions are provided, and the plurality of second locking portions are arranged at intervals along the circumference of the first joint cavity to form a fool-proof structure so that the first joint seat and the second joint seat are locked at a unique angle.

[0024] As an optional solution of the above-mentioned cart frame, the side bracket includes a front wheel bracket and a rear wheel bracket;

[0025] The joint also includes:

[0026] A third joint seat, wherein the third joint seat and the first joint seat are respectively located at opposite sides of the second joint seat, the third joint seat and the second joint seat are rotatably connected, and one of the third joint seat and the second joint seat is fixedly connected to the front wheel bracket, and the other is fixedly connected to the rear wheel bracket, so that the side bracket has an unfolded state and a folded state, the second joint seat and the third joint seat enclose a second joint cavity, the inner wall of the second joint cavity is provided with a second locking groove, and the second locking groove extends to the third joint seat and the second joint seat at both ends along the first direction;

[0027] The third locking member is arranged in the second joint cavity, and the third locking member includes a third locking portion, and the third locking portion is slidably arranged in the second locking groove to lock or unlock the second joint seat and the third joint seat.

[0028] As an optional solution of the above-mentioned cart frame, the joint further includes a third reset member, one end of the third reset member is connected to or abuts against the third locking member, and the other end is connected to or abuts against the inner wall of the second joint cavity, and the third reset member is used to drive the third locking member to slide in the direction of locking the second joint seat and the third joint seat;

[0029] The elastic force of the third resetting member is directed from the third joint seat to the second joint seat along a first direction.

[0030] As an optional solution of the above-mentioned cart frame, the second locking member further includes a linkage portion, the linkage portion is slidably arranged in the second joint seat, and the linkage portion is connected to or can abut against the third locking member;

[0031] When the joint switches from a locked state to an unlocked state, the second locking member moves toward the second joint seat and drives the third locking member to slide toward the direction away from the second joint seat through the linkage portion.

[0032] As an optional solution of the above-mentioned stroller frame, the seat supporting mechanism includes:

[0033] A support, used for mounting the seat assembly, the support being rotatably disposed on the cross brace, and the rotation axis being perpendicular to the first direction, so as to switch the orientation of the seat assembly;

[0034] A linkage mechanism is provided between the support and the first locking member, and the linkage mechanism can push the first locking member to slide after the support is rotated to a working state or after the support is rotated to a working state, so that the first locking member locks the first joint seat and the second joint seat;

[0035] A push handle, movably disposed on the support, so that the push handle has an unfolded state and a folded state;

[0036] When the push handle is in the unfolded state, the push handle triggers the linkage mechanism so that the linkage mechanism pushes the first locking member;

[0037] When the push handle is in the folded state, the push handle is disengaged from the linkage mechanism, the linkage mechanism is reset, and the first locking member is disengaged from the second joint seat.

[0038] As an optional solution of the above-mentioned cart frame, the linkage mechanism includes:

[0039] A slider is slidably arranged on the support, and a limiting groove is arranged on the slider;

[0040] A rotating member, the middle portion of which is rotatably connected to the support, one end of the rotating member extends into the limiting groove, and the other end of the rotating member is used to abut against the first locking member;

[0041] The push handle includes a blocking portion. When the push handle is in an unfolded state, the blocking portion pushes the slider to slide, so as to drive the rotating member to abut against the first locking member. When the push handle is in a folded state, the blocking portion and the slider are staggered.

[0042] A fourth elastic member, one end of which is connected to or abuts against the support, and the other end of which is connected to or abuts against the slider, and the direction of the elastic force of the fourth elastic member is opposite to the force of the blocking portion on the slider.

[0043] A child stroller comprises a seat assembly and the above-mentioned stroller frame, wherein the seat assembly is mounted on the stroller frame.

[0044] Beneficial effects of the present invention:

[0045] In the cart frame provided by the present invention, along the first direction, at least part of the cross-sectional area of ​​the first locking portion and / or the first locking groove gradually decreases, so that when the first locking portion extends into the first locking groove to lock the first joint seat and the second joint seat, there is a gap-free fit between the first locking portion and the first locking groove, thereby eliminating the gap between the first joint seat and the second joint seat after locking and reducing the amount of shaking.

[0046] The unlocking of the first joint seat and the second joint seat is achieved by the elastic force of the first reset piece, and the locking force of the first joint seat and the second joint seat is provided by the seat supporting mechanism. The locking force is stable, which is beneficial to improving the stability of the first joint seat and the second joint seat when locked.

[0047] The child stroller provided by the present invention adopts the above-mentioned stroller frame, which can eliminate the gap between the joints, reduce the shaking amount, and make the locking force of the joints more stable, thereby improving the stability of the child stroller. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is an exploded view of the cart frame provided by the present invention;

[0049] Figure 2 is an exploded view of a joint provided by the present invention;

[0050] Figure 3 is a structural schematic diagram of a first joint seat provided by the present invention;

[0051] Figure 4 This is a schematic diagram of the structure of the second joint seat provided by the present invention. Figure 1 ;

[0052] Figure 5 This is a schematic diagram of the structure of the second joint seat provided by the present invention. Figure 2 ;

[0053] Figure 6 is a front view of the first joint seat provided by the present invention;

[0054] Figure 7 is a front view of the second joint seat provided by the present invention;

[0055] Figure 8 is a cross-sectional view of a joint provided by the present invention in a locked state;

[0056] Fig. 9 is a schematic structural diagram of a first locking member provided by the present invention;

[0057] Fig.10 is a cross-sectional view of the stroller frame provided by the present invention when the joints are in a locked state;

[0058] Fig.11 is a cross-sectional view of the stroller frame provided by the present invention when the joints are in an unlocked state;

[0059] Fig.12 It is a structural schematic diagram of the first locking member and the pushing portion provided by the present invention;

[0060] Fig.13 It is a structural schematic diagram of the cart frame provided by the present invention when it is in an unfolded state;

[0061] Fig.14 It is a schematic structural diagram of the cart frame provided by the present invention when it is in a folded state.

[0062] In the figure:

[0063] 100. Cart frame;

[0064] 10. Joint; 101. First locking groove; 102. Second locking groove; 103. First tooth groove; 11. First joint seat; 111. Rotating shaft; 112. First groove section; 113. Fifth groove section; 12. Second joint seat; 121. Second groove section; 122. Third groove section; 123. Connecting hole; 124. Sixth groove section; 13. Third joint seat; 14. First locking member; 141. First locking body; 1411. Positioning hole; 1412. Positioning groove; 142. First locking part; 15. Third locking member; 151. Third locking part; 16. Second locking member; 161. Second locking part; 162. Linkage part; 17. First reset member; 18. Third reset member; 19. Second reset member;

[0065] 20. Side bracket; 21. Front wheel bracket; 22. Rear wheel bracket;

[0066] 30. Horizontal support; 31. Horizontal support body; 32. Upper cover; 33. Lower cover; 34. Horizontal support shaft;

[0067] 40. Support;

[0068] 50. Seat plate;

[0069] 61. trigger assembly; 611. slider; 612. rotating member; 613. fourth elastic member; 62. pushing member; 621. connecting portion; 622. force-bearing portion;

[0070] 70. Push handle; 71. Blocking part. DETAILED DESCRIPTION

[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0072] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0074] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0075] Embodiment 1

[0076] like Figure 1As shown, this embodiment provides a child stroller, including a seat assembly and a stroller frame 100, wherein the seat assembly is mounted on the stroller frame 100. When in use, the infant sits or lies in the seat assembly, and the adult who takes care of the infant supports the stroller frame 100 to carry the infant out through the child stroller.

[0077] In this embodiment, the cart frame 100 includes two side brackets 20 arranged opposite to each other and a cross brace 30 supported between the two side brackets 20 . The cross brace 30 connects the two side brackets 20 into one body, thereby improving the overall stability and strength of the cart frame 100 .

[0078] Among them, the cart frame 100 also includes a joint 10, and the side bracket 20 includes a front wheel bracket 21 and a rear wheel bracket 22. The joint 10 connects the front wheel bracket 21, the rear wheel bracket 22 and the cross brace 30, so that the front wheel bracket 21, the rear wheel bracket 22 and the cross brace 30 can rotate relative to each other in pairs, or be fixed relative to each other in pairs, so that the side bracket 20 can be folded or unfolded as needed.

[0079] Specifically, the joint 10 includes a first joint seat 11, a second joint seat 12, and a third joint seat 13 that are sequentially connected and rotated in a first direction, the first joint seat 11 is arranged on the cross brace 30, the second joint seat 12 is arranged on the top of the rear wheel bracket 22, and the third joint seat 13 is arranged on the top of the front wheel bracket 21. In some embodiments, the second joint seat 12 can be arranged on the top of the front wheel bracket 21, and correspondingly, the third joint seat 13 is arranged on the top of the rear wheel bracket 22.

[0080] To achieve the locking of the joint 10, in some embodiments, a first joint cavity is formed between the first joint seat 11 and the second joint seat 12, and a second locking member 16 is slidably disposed in the first direction in the first joint cavity, and the second locking member 16 can lock or unlock the second joint seat 12 and the first joint seat 11. A second joint cavity is formed between the second joint seat 12 and the third joint seat 13, and a third locking member 15 is slidably disposed in the second joint cavity along the first direction, and the third locking member 15 can lock or unlock the second joint seat 12 and the third joint seat 13.

[0081] In order to enable the joint 10 to smoothly switch between the unlocked state and the locked state, a certain gap needs to be reserved between the second locking member 16 and the first joint cavity when they cooperate with each other. Similarly, a certain gap needs to be reserved between the third locking member 15 and the second joint cavity when they cooperate with each other to ensure that the second locking member 16 and the third locking member 15 can slide smoothly along the first direction. This results in some shaking gaps in the joint 10, affecting the stability of the cart frame 100.

[0082] To solve the above problems, Figure 2-Figure 5As shown, the first joint seat 11 is provided with a first slot section 112, and the second joint seat 12 is provided with a second slot section 121. The first slot section 112 and the second slot section 121 can be connected to form a first locking groove 101. The joint 10 also includes a first locking member 14, which is slidably matched with the first joint seat 11 along the first direction. The first locking member 14 includes a first locking portion 142, and the first locking portion 142 is slidably arranged in the first locking groove 101 along the first direction, so that the first locking portion 142 can be matched with the first slot section 112 and the second slot section 121 at the same time. Along the first direction, at least part of the cross-sectional area of ​​the first locking portion 142 and / or the first locking groove 101 gradually decreases.

[0083] When the first locking portion 142 cooperates with the first groove section 112 and the second groove section 121 at the same time, since at least part of the cross-sectional area of ​​the first locking portion 142 and / or the first locking groove 101 gradually decreases, at least part of the cooperation position of the first locking portion 142 and the first locking groove 101 is a cooperation without shaking clearance, thereby eliminating the clearance between the first joint seat 11 and the second joint seat 12 after locking, reducing the amount of shaking, and thus improving the stability of the cart frame 100.

[0084] In this embodiment, the first joint seat 11 and the second joint seat 12 cooperate to form a first locking groove 101, and the first locking groove 101 extends along the first direction. When the first locking portion 142 slides along the first direction, it can switch between a state of cooperating with only one of the first groove section 112 and the second groove section 121 and a state of cooperating with both the first groove section 112 and the second groove section 121. When the first locking portion 142 cooperates with the first groove section 112 and the second groove section 121 at the same time, the first locking portion 142 restricts the second joint seat 12 from rotating relative to the first joint seat 11, so that the first joint seat 11 and the second joint seat 12 are in a locked state, and the first locking member 14 cooperates with the second locking member 16 to further improve the stability of the locked state.

[0085] In some embodiments, when the first locking member 14 moves along the first direction from the first joint seat 11 to the second joint seat 12 , the first locking portion 142 cooperates with the first slot section 112 and the second slot section 121 simultaneously to eliminate the gap between the joints 10 .

[0086] In order to achieve the cooperation between the first locking portion 142 and the first locking groove 101, at least part of the cross-sectional area of ​​the first locking portion 142 and / or the first locking groove 101 is gradually reduced along the direction from the first joint seat 11 to the second joint seat 12. With this arrangement, when the first locking portion 142 slides in the first locking groove 101 and gradually disengages from the second groove section 121, there is a gap between the first locking portion 142 and the first locking groove 101, and the gap will gradually increase, thereby ensuring that the first locking portion 142 can be smoothly disengaged from the second groove section 121.

[0087] like Figure 6-Figure 8 As shown, along the direction from the first joint seat 11 to the second joint seat 12, the cross-sectional area of ​​the first locking groove 101 gradually decreases, and the shape of the first locking portion 142 is adapted to the shape of the first locking groove 101. Both the first locking groove 101 and the first locking portion 142 have a taper, which improves the locking effect of the first locking portion 142 on the first joint seat 11 and the second joint seat 12, thereby reducing the shaking amount of the joint 10.

[0088] That is to say, along the direction from the first joint seat 11 to the second joint seat 12, the cross-sectional shape of the first locking portion 142 gradually decreases, the cross-sectional areas of the first slot segment 112 and the second slot segment 121 gradually decrease, and the minimum cross-sectional area of ​​the first slot segment 112 is equal to the maximum cross-sectional area of ​​the second slot segment 121, so that the cross-sectional area of ​​the first locking slot 101 changes continuously.

[0089] Specifically, the shape of the first locking portion 142 is roughly a prism, and correspondingly, the circumferential inner wall of the first locking groove 101 is roughly a prism surface, so as to ensure a gap-free fit between the first locking portion 142 and the first locking groove 101. It should be noted here that each side surface of the first locking portion 142 can be a plane or a curved surface.

[0090] In other embodiments, the shape of the first locking portion 142 may be a pyramid, a frustum, or a cone, so that the cross-sectional area of ​​the first locking portion 142 meets the requirement of a clearance-free fit.

[0091] In some embodiments, along the direction from the first joint seat 11 to the second joint seat 12, the first locking portion 142 may include a fixed section with a fixed cross-sectional area and a gradual section with a gradually decreasing cross-sectional area. Correspondingly, the first locking groove 101 includes a fixed groove section that cooperates with the fixed section and a gradual groove section that cooperates with the gradual section to ensure a gap-free fit. Exemplarily, the fixed section may be a prism section and the gradual section may be a pyramid section.

[0092] In some embodiments, along the direction pointing from the first joint seat 11 to the second joint seat 12, only the cross-sectional area of ​​at least part of the first locking portion 142 or at least part of the first locking groove 101 can be gradually reduced, which can also reduce or eliminate the fitting clearance, thereby reducing the amount of shaking of the joint 10.

[0093] In some embodiments, along the direction from the first joint seat 11 to the second joint seat 12, the cross-sectional area of ​​one of the first locking portion 142 and the first slot section 112 gradually decreases to prevent the first locking member 14 and the first joint seat 11 from shaking relative to each other. Exemplarily, when the first joint seat 11 and the second joint seat 12 are in a locked state, the cross-sectional area of ​​the first locking portion 142 that matches the first slot section 112 gradually decreases along the direction from the first joint seat 11 to the second joint seat 12, and the cross-sectional area of ​​the first slot section 112 may remain unchanged; or, along the direction from the first joint seat 11 to the second joint seat 12, the cross-sectional area of ​​the first slot section 112 gradually decreases, and when the first joint seat 11 and the second joint seat 12 are in a locked state, the cross-sectional surface of the first locking portion 142 that matches the first slot section 112 may remain unchanged.

[0094] In some embodiments, along the direction from the first joint seat 11 to the second joint seat 12, the cross-sectional area of ​​one of the first locking portion 142 and the second slot section 121 gradually decreases to prevent the first locking member 14 from shaking relative to the second joint seat 12. Exemplarily, when the first joint seat 11 and the second joint seat 12 are in a locked state, the cross-sectional area of ​​the first locking portion 142 that matches the second slot section 121 gradually decreases along the direction from the first joint seat 11 to the second joint seat 12, and the cross-sectional area of ​​the second slot section 121 may remain unchanged; or, along the direction from the first joint seat 11 to the second joint seat 12, the cross-sectional area of ​​the second slot section 121 gradually decreases, and when the first joint seat 11 and the second joint seat 12 are in a locked state, the cross-sectional surface of the first locking portion 142 that matches the second slot section 121 may remain unchanged.

[0095] In order to realize the unlocking and locking of the second joint seat 12 and the third joint seat 13 by the third locking member 15, in some embodiments, the second joint seat 12 is provided with a third slot section 122, and the third joint seat 13 is provided with a fourth slot section, and the third slot section 122 and the fourth slot section can be connected to form a second locking slot 102. The third locking member 15 is slidably matched with the third joint seat 13 along the first direction, and the third locking member 15 includes a third locking portion 151, and the third locking portion 151 is slidably arranged in the second locking slot 102 to lock or unlock the second joint seat 12 and the third joint seat 13. When the third locking portion 151 is matched with the third slot section 122 and the fourth slot section at the same time, the second joint seat 12 and the third joint seat 13 are locked; when the third locking portion 151 is matched with only one of the third slot section 122 and the fourth slot section, the second joint seat 12 and the third joint seat 13 are unlocked.

[0096] In some embodiments, the third locking portion 151 can slide along the first direction to disengage from the third slot section 122, so as to only cooperate with the fourth slot section. At this time, the second joint seat 12 and the third joint seat 13 are unlocked and can rotate relative to each other. The third locking portion 151 can slide along the first direction into the third slot section 122, so as to cooperate with the fourth slot section and the third slot section 122 at the same time. At this time, the third locking portion 151 limits the relative rotation of the third joint seat 13 and the second joint seat 12, so that the third joint seat 13 and the second joint seat 12 are in a locked state.

[0097] In some embodiments, the third locking member 15 can slide along the first direction to disengage from the fourth slot section, so that the third locking portion 151 can only cooperate with the third slot section 122, and the third joint seat 13 and the second joint seat 12 can also be in an unlocked state.

[0098] In some embodiments, when the joint 10 switches from the locked state to the unlocked state, the first locking member 14 and the third locking member 15 move in opposite directions to be respectively disengaged from the second joint seat 12. When the joint 10 switches from the locked state to the unlocked state, the first locking member 14 and the third locking member 15 move in opposite directions to disengage the first locking portion 142 from the second slot section 121, and the third locking portion 151 from the third slot section 122. That is to say, when the joint 10 is in the unlocked state, the first locking portion 142 is located in the first joint seat 11, and the third locking portion 151 is located in the third joint seat 13, so that the size of the second joint seat 12 along the first direction can be relatively small, and it only needs to be able to cooperate with the first locking portion 142 and the third locking portion 151 respectively when the joint 10 is in the locked state, which is conducive to making the structure of the joint 10 more compact and reducing the size of the joint 10 along the first direction.

[0099] In some embodiments, the third locking member 15 is a joint tooth, and the third locking portion 151 is arranged on the circumferential outer wall of the joint tooth. There are multiple third locking portions 151 and they are arranged at intervals along the circumference to improve the locking effect of the second joint seat 12 and the third joint seat 13.

[0100] Combination Figure 2 As shown, the joint 10 also includes a third reset member 18, one end of the third reset member 18 is connected to or abuts the third locking member 15, and the other end is connected to or abuts the third joint seat 13. The third reset member 18 is used to drive the third locking member 15 to slide toward the second joint seat 12 so that the second joint seat 12 and the third joint seat 13 are in a locked state.

[0101] Optionally, the third resetting member 18 may be a spring, and the spring may be a compression spring, which is always in a compressed state to drive the third locking member 15 to move toward the second joint seat 12 .

[0102] In some embodiments, the other end of the third reset member 18 can be connected to the second joint seat 12 . At this time, the spring can be a tension spring, and the spring is always in a tension state so as to drive the third locking member 15 to move toward the second joint seat 12 .

[0103] In this embodiment, the third locking member 15 and the second locking groove 102 form a matching gap when the second joint seat 12 and the third joint seat 13 are locked, so that the second joint seat 12 and the third joint seat 13 have a certain amount of movement in the locked state.

[0104] In order to achieve unlocking and locking of the second joint seat 12 and the first joint seat 11 through the second locking member 16, in some embodiments, a first tooth groove 103 is provided on the inner wall of the first joint cavity, and the first tooth groove 103 extends to the first joint seat 11 and the second joint seat 12 at both ends along the first direction, that is, the first tooth groove 103 is formed by splicing the first joint seat 11 and the second joint seat 12. The second locking member 16 includes a second locking portion 161, and the second locking portion 161 is slidably matched with the first tooth groove 103, so that the second locking portion 161 can switch between the state of only matching with one of the first joint seat 11 and the second joint seat 12, and matching with the first joint seat 11 and the second joint seat 12 at the same time, so as to achieve locking and unlocking of the first joint seat 11 and the second joint seat 12.

[0105] Since the first locking member 14 can achieve a gapless fit with the first joint seat 11 and the second joint seat 12, thereby eliminating the shaking of the joint 10, in this embodiment, an assembly gap is formed between the second locking portion 161 and the first tooth groove 103, which reduces the machining accuracy requirements while ensuring that the second locking portion 161 slides smoothly in the first tooth groove 103, which is conducive to reducing costs. It should be noted here that the assembly gap formed between the second locking portion 161 and the first tooth groove 103 means that there is a gap between the second locking portion 161 and the groove wall of the first tooth groove 103 along the circumference of the first joint cavity.

[0106] In this embodiment, the cross-sectional areas of the second locking portion 161 and the first tooth groove 103 can be fixed along the first direction, which reduces the processing difficulty of the second locking member 16 and the first tooth groove 103 and facilitates the assembly of the second locking member 16 and the first joint cavity.

[0107] like Figure 2 As shown, the second locking member 16 can be a joint tooth, including a first gear body and a second locking portion 161, and the second locking portion 161 is convexly arranged on the circumferential outer wall of the first gear body. In order to improve the locking effect of the second locking member 16 on the first joint seat 11 and the second joint seat 12, the number of the second locking portions 161 is provided, and the plurality of second locking portions 161 are arranged at intervals along the circumference of the first gear body.

[0108] In order to prevent the second locking piece 16 from interfering with the movement of the first locking piece 14, when the first joint seat 11 and the second joint seat 12 are in a locked state, the first locking groove 101 and the first tooth groove 103 are alternately arranged along the circumference of the first joint cavity, so that the first locking portion 142 and the second locking portion 161 are alternately staggered to prevent the first locking portion 142 and the second locking portion 161 from interfering with each other.

[0109] Specifically, Figure 3 and Figure 4 As shown, a fifth slot section 113 is provided on one side of the first joint seat 11 facing the second joint seat 12, and a sixth slot section 124 is provided on one side of the second joint seat 12 facing the first joint seat 11. The fifth slot section 113 and the sixth slot section 124 are connected and enclose the first tooth groove 103. The fifth slot section 113 and the first slot section 112 are arranged at intervals along the circumference of the first joint seat 11, and the first locking portion 142 can pass through the gap between two adjacent second locking portions 161, thereby cooperating with the second slot section 121.

[0110] When the first groove section 112 in the first joint seat 11 and the second groove section 121 in the second joint seat 12 are not aligned, if the first locking piece 14 slides toward the second joint seat 12, the first locking piece 14 will be in rigid contact with the second joint seat 12, resulting in a large impact, which may easily cause wear of the first locking portion 142, thereby affecting the effect of eliminating the shaking gap of the joint 10.

[0111] To solve the above problems, combined with Figure 2 As shown, the joint 10 also includes a second reset member 19, which is connected to or abuts against the second locking member 16 to apply an elastic force to the second locking member 16, and the elastic force is used to drive the second locking member 16 to move along the first direction to lock the first joint seat 11 and the second joint seat 12, so that when the first joint seat 11 and the second joint seat 12 are rotated to align the first groove section 112 and the second groove section 121, the first joint seat 11 and the second joint seat 12 are automatically locked, so that the first locking portion 142 in the first locking member 14 can cooperate smoothly with the second groove section 121 when it is necessary to eliminate the joint gap.

[0112] Specifically, one end of the second reset member 19 is connected to or abuts the second locking member 16, and the other end is connected to or abuts the second joint seat 12. The elastic force of the second reset member 19 can push the second locking member 16 to slide toward the first joint seat 11, so that the first joint seat 11 and the second joint seat 12 are in a locked state.

[0113] Optionally, the second reset member 19 may be a spring, and the spring may be a compression spring, which is always in a compressed state to drive the second locking member 16 to move toward the second joint seat 12 .

[0114] In some embodiments, the other end of the second reset member 19 can be connected to the first joint seat 11 . In this case, the spring can be a tension spring, which is always in a tensioned state so as to drive the second locking member 16 to move toward the second joint seat 12 .

[0115] To facilitate the rotational connection among the first joint seat 11, the second joint seat 12 and the third joint seat 13, a rotating shaft 111 is provided on the side of the first joint seat 11 facing the second joint seat 12. The rotating shaft 111 passes through the second locking piece 16 and the second joint seat 12 in sequence and is rotationally connected to the second joint seat 12. The end of the rotating shaft 111 is rotationally connected to the third joint seat 13.

[0116] In this embodiment, the third locking member 15 and the second locking member 16 have the same direction of movement from the unlocked position to the locked position, which is from the second joint seat 12 to the first joint seat 11 along the first direction. In order to simplify the unlocking structure of the joint 10, the second locking member 16 also includes a linkage portion 162, which is slidably arranged in the second joint seat 12, and the linkage portion 162 is connected to or can abut against the third locking member 15. When the joint 10 switches from the locked state to the unlocked state, the second locking member 16 moves along the first direction close to the second joint seat 12, and drives the third locking member 15 to slide away from the second joint seat 12 through the linkage portion 162. In other words, the linkage portion 162 realizes the linkage between the second locking member 16 and the third locking member 15 during the unlocking process, and there is no need to set up structures separately to drive the second locking member 16 and the third locking member 15 to move separately, which is conducive to reducing the number of parts and simplifying the structure.

[0117] like Figure 4 and Figure 5 As shown, a communication hole 123 is provided on the second joint seat 12 , and the linkage portion 162 can pass through the communication hole 123 to abut or connect with the third locking member 15 .

[0118] Optionally, two linkage parts 162 are provided, and the two linkage parts 162 are symmetrically arranged relative to the rotating shaft 111, so that the force between the linkage part 162 and the third locking member 15 is more uniform.

[0119] Optionally, the cart frame 100 further includes a first unlocking component, which can contact the second locking member 16 to push the second locking member 16 to move toward the second joint seat 12, so that the second locking member 16 is disengaged from the first joint seat 11, thereby enabling the first joint seat 11 and the second joint seat 12 to be unlocked. During the process of the second locking member 16 disengaging from the first joint seat 11, the linkage portion 162 pushes the third locking member 15 to move away from the second joint seat 12, thereby enabling the second joint seat 12 and the third joint seat 13 to be unlocked.

[0120] Optionally, the first unlocking assembly may include a first unlocking rod, and the first unlocking rod can slide along the first direction to push the second locking member 16 .

[0121] In order to enable the first locking member 14 to automatically move to a position that eliminates the gap between the first joint seat 11 and the second joint seat 12, in the present embodiment, the cart frame 100 also includes a seat supporting mechanism, which is movably arranged on the cross brace 30 so that the seat supporting mechanism can switch between the use position and the non-use position; when the seat supporting mechanism moves to the use position, the seat supporting mechanism engages with the first locking member 14 and pushes the first locking member 14 to move within the first locking groove 101, so as to cooperate with the first groove section 112 and the second groove section 121 at the same time to eliminate the joint gap between the first joint seat 11 and the second joint seat 12.

[0122] In some embodiments, the first locking member 14 also includes a first locking body 141, and the first locking portion 142 is fixedly disposed on the first locking body 141. When the seat support mechanism moves to the use position, it abuts against the first locking body 141 and pushes the first locking body 141 to move, so that the first locking portion 142 simultaneously cooperates with the first slot section 112 and the second slot section 121 to eliminate the gap of the joint 10.

[0123] The joint 10 further includes a first reset member 17, which abuts or connects to the first locking member 14 to apply an elastic force to the first locking member 14. The elastic force is used to push the first locking member 14 to move in a first direction away from the second joint seat 12.

[0124] That is, the locking force of the first joint seat 11 and the second joint seat 12 is the external force applied by the seat support mechanism, and the unlocking force is the elastic force, so that the locking force is more stable. It can be understood that when the seat support mechanism is in the use position, the stroller frame 100 is in the unfolded state. At this time, the first locking member 14 is driven by the seat support mechanism to move and lock the first joint seat 11 and the second joint seat 12, which is conducive to improving the stability of the stroller frame 100, thereby improving the riding safety of infants and young children.

[0125] In order to facilitate the seat support mechanism to drive the first locking member 14 to move along the first direction, the seat support mechanism Figure 2 and Fig. 9As shown, the first locking body 141 is movably arranged on the side of the first joint seat 11 facing the seat support mechanism, that is, the first locking body 141 is arranged on the side of the first joint seat 11 away from the second joint seat 12, and the first locking portion 142 is arranged on the side of the first locking body 141 facing the first joint seat 11, and the first locking portion 142 penetrates the first joint seat 11 and extends in the first groove section 112. By arranging the first locking body 141 on the side of the first joint seat 11 away from the second joint seat 12, on the one hand, the distance between the first locking body 141 and the seat support mechanism on the cross brace 30 can be shortened to facilitate the cooperation between the two; on the other hand, the space between the first joint seat 11 and the second joint seat 12 can be reduced, so that the cooperation between the first joint seat 11 and the second joint seat 12 is more compact, thereby reducing the size of the joint 10 and avoiding the joint 10 from being bloated and affecting flexibility.

[0126] In addition, the first locking portion 142 is disposed through the first joint seat 11 , and the first locking portion 142 only needs to move a small distance to engage with or disengage from the second slot section 121 in the second joint seat 12 , and the unlocking and locking responses are fast.

[0127] Specifically, the direction of the external force provided by the seat supporting mechanism to the first locking member 14 is along the first direction from the first joint seat 11 to the second joint seat 12. Under the action of the external force, the first locking body 141 moves in a direction close to the first joint seat 11 so that the first locking portion 142 can slide into the second groove section 121, and the first reset member 17 is deformed to accumulate resilience. Correspondingly, the direction of the elastic force provided by the first reset member 17 is along the first direction from the second joint seat 12 to the first joint seat 11; after the external force applied by the seat supporting mechanism is cancelled, the first reset member 17 drives the first locking body 141 to reset and move, so as to drive the first locking portion 142 to move in a direction away from the first locking groove 101, so that the first locking portion 142 can disengage from the second groove section 121 and only cooperate with the first groove section 112.

[0128] Optionally, the first restoring member 17 may be a spring, which is located between the first joint seat 11 and the first locking body 141 . The spring is always in a compressed state to drive the first locking member 14 to move away from the second joint seat 12 .

[0129] In some embodiments, a positioning groove 1412 is provided on the first locking body 141 , and one end of the first restoring member 17 extends into the positioning groove 1412 to achieve positioning of the first restoring member 17 .

[0130] In some embodiments, the first locking body 141 is provided with a positioning hole 1411, which cooperates with the cross brace 30 to achieve the positioning of the first locking member 14. Optionally, the cross brace 30 may be provided with a positioning column, which cooperates with the positioning hole 1411.

[0131] It can be understood that when the first locking member 14 is located in the first joint cavity, the other end of the first resetting member 17 abuts against or connects to the first joint seat 11 or the second joint seat 12 .

[0132] Optionally, there are multiple first locking portions 142 , and the multiple first locking portions 142 are arranged at intervals in the circumferential direction around the first locking body 141 to improve the locking effect of the first joint seat 11 and the second joint seat 12 .

[0133] In this embodiment, the first locking body 141 may be a plate-like structure to reduce the space occupied by the first locking body 141 , making the first locking member 14 and the first joint seat 11 fit more compactly, thereby reducing the size of the joint 10 .

[0134] In other embodiments, a first joint cavity is formed between the first joint seat 11 and the second joint seat 12, and the first locking piece 14 is arranged in the first joint cavity. The first joint seat 11 and the second joint seat 12 can also be locked and unlocked by sliding the first locking piece 14, and the amount of shaking of the joint in the locked state can be reduced.

[0135] Since the cross-sectional areas of the first locking portion 142 and the first locking groove 101 are variable, interference will occur when the first locking member 14 is directly assembled with the first joint seat 11 and the second joint seat 12 respectively. In order to facilitate the assembly of the first locking member 14 with the first joint seat 11 and the second joint seat 12 respectively, the first joint seat 11 includes a first joint outer ring and a first end cover that can be detachably connected, the first groove section 112 is arranged on the inner wall of the first joint outer ring, and the first end cover is arranged on the side of the first joint outer ring away from the second joint seat 12. When assembling, the first joint outer ring can be assembled with the second joint seat 12 to form the first locking groove 101, and then the first locking member 14 can be installed in the first locking groove 101 along the direction from the first joint seat 11 to the second joint seat 12, and finally the first end cover is fixed to the first joint outer ring to complete the assembly of the first joint seat 11, the second joint seat 12 and the first locking member 14.

[0136] Optionally, the first joint outer ring and the first end cover may be fixed by snap connection or screws to facilitate disassembly.

[0137] Combination Figure 1 and Fig.10As shown, the seat support mechanism includes a support 40 and a linkage mechanism. The support 40 is used to install the seat assembly, and the support 40 is rotatably set on the cross brace 30 to switch the orientation of the seat assembly. Specifically, the rotation axis of the support 40 extends approximately vertically, so that the support 40 can drive the seat assembly to rotate, so that the seat assembly can be set forward or backward, thereby adjusting the orientation of the infant on the seat assembly. When the seat support mechanism is in a working state, the support 40 rotates into place so that the seat assembly thereon is set forward or backward. The linkage mechanism is arranged between the support 40 and the first locking member 14, and the linkage mechanism can drive the first locking member 14 to slide after the support 40 rotates into place, so that the first locking member 14 locks the first joint seat 11 and the second joint seat 12.

[0138] In this embodiment, the state of the joint 10 is linked to the adjustment of the seat assembly. During the adjustment of the seat assembly, the first locking member 14 is in an unlocked state; when the seat assembly is adjusted to face forward or backward, the first locking member 14 can automatically lock the first joint seat 11 and the second joint seat 12 under the action of the linkage mechanism, eliminating the shaking between the joints 10 to improve the stability of the cart frame 100.

[0139] It should be noted that after the seat assembly is adjusted into place, the first joint seat 11 and the second joint seat 12 are locked under the action of the first locking member 14, and there is no shaking gap, and the stability is good. When the seat assembly is in the process of adjustment, the first locking member 14 is in a state of unlocking the first joint seat 11 and the second joint seat 12, but the second locking member 16 can be in a state of locking or unlocking the first joint seat 11 and the second joint seat 12.

[0140] Specifically, the linkage assembly includes a trigger assembly 61, which is arranged on the support 40 and can rotate with the support 40. When the support 40 is rotated into place, the trigger assembly 61 is arranged corresponding to the first locking member 14. The trigger assembly 61 can apply a pushing force to the first locking member 14, thereby locking the first joint seat 11 and the second joint seat 12.

[0141] Optionally, the linkage mechanism also includes a pushing member 62, which is slidably arranged on the cross brace 30 along the first direction, one end of the pushing member 62 is connected or abutted with the first locking member 14, and the other end of the pushing member 62 can cooperate with the trigger assembly 61 to transmit the driving force, so that the trigger assembly 61 pushes the first locking member 14 through the pushing member 62.

[0142] In this embodiment, the seat support mechanism further includes a push handle 70, which is movably arranged on the support 40 so that the push handle 70 has a folded state and an unfolded state; when the push handle 70 is in the unfolded state, the push handle 70 abuts against the linkage mechanism to trigger the linkage mechanism to move, so that the linkage mechanism can push the first locking member 14; when the push handle 70 is in the folded state, the push handle 70 is disengaged from the linkage mechanism, the linkage mechanism is reset, and the first locking member 14 is disengaged from the second joint seat 12. This arrangement automatically locks the joint 10 when the push handle 70 is in the unfolded state, improves the stability of the stroller frame 100, and ensures the safety of infants and young children; when the push handle 70 is in the folded state, the linkage mechanism is not triggered and can be reset to the initial position, so that the joint 10 is in the unlocked state, which facilitates the adjustment of the posture of the stroller frame 100.

[0143] It should be noted that when the seat support mechanism is in the working state, the support 40 is rotated into place and the push handle 70 is in the unfolded state. The unfolded state of the push handle 70 is the state in which the stroller frame 100 is used when carrying an infant. Fig.13 As shown, the push handle 70 is roughly parallel to the front wheel bracket 21 when in the unfolded state, and the cart frame 100 is in a stable unfolded use state as a whole. The folded state of the push handle 70 refers to the push handle 70 being located at any position of the non-expanded state, which can be the position of the cart frame 100 being in a fully folded state, or any position during the folding process.

[0144] refer to Fig.10 and Fig.11 As shown, in the linkage mechanism, the push member 62 is slidably arranged on the cross brace 30 along the first direction, so that the sliding direction of the push member 62 is parallel to the sliding direction of the first locking member 14, so that the push member 62 can push the first locking member 14 to move. The trigger assembly 61 includes a slider 611 and a rotating member 612. The slider 611 is slidably arranged on the support 40, and a limiting groove is arranged on the slider 611; the middle part of the rotating member 612 is rotatably connected to the support 40, one end of the rotating member 612 extends into the limiting groove, and the other end of the rotating member 612 is used to abut against the push member 62. When the slider 611 slides, the inner wall of the limiting groove is released from the rotating member 612, and the rotating member 612 is pushed to rotate, so that the other end of the rotating member 612 can abut or disengage from the push member 62.

[0145] When the slider 611 moves in the positive direction, Fig.10 As shown, the rotating member 612 abuts against the pushing member 62, and as the rotating member 612 continues to rotate, the rotating member 612 will push the pushing member 62 close to the first locking member 14, thereby pushing the first locking member 14 close to the second joint seat 12, thereby locking the first joint seat 11 and the second joint seat 12; when the slider 611 moves in the reverse direction, as shown in FIG. Fig.11As shown, the slider 611 drives the rotating member 612 to rotate in the direction away from the first locking member 14. The pushing force of the rotating member 612 on the first locking member 14 is small. The first locking member 14 will move in the direction away from the second joint seat 12 under the action of the first reset member 17, and the first locking member 14 will disengage from the second joint seat 12, thereby realizing the unlocking of the first joint seat 11 and the second joint seat 12.

[0146] In this embodiment, the slider 611 is located above the rotating member 612, and the bottom end of the slider 611 is concave to form a limiting groove, so that the top end of the rotating member 612 can be inserted into the limiting groove. The positive movement of the slider 611 means that the slider 611 moves away from the first locking member 14 along the first direction, and the reverse movement of the slider 611 means that the slider 611 moves toward the first locking member 14 along the first direction.

[0147] In this embodiment, the size of the slot opening of the limiting slot along the first direction is larger than the size of its slot bottom along the first direction, so that the opening size of the limiting slot is large, which facilitates the rotation member 612 to extend into the limiting slot and provides avoidance space for the rotation of the rotating member 612.

[0148] Specifically, an avoidance slope is set in the limiting groove, and the avoidance slope is set at an angle to the first direction. Along the direction in which the rotating member 612 is inserted into the limiting groove, the distance between the avoidance slope and the rotating member 612 gradually decreases along the first direction, thereby increasing the size of the slot.

[0149] Optionally, the rotating member 612 is located between the avoidance slope and the first locking member 14. When the slider 611 abuts against the rotating member 612 to push the first locking member 14 close to the second joint seat 12, the inner wall on the side of the limiting groove that contacts the rotating member 612 is the opposite side of the avoidance slope, and the rotating member 612 does not contact the avoidance slope, thereby preventing the rotating member 612 from slipping out of the limiting groove.

[0150] In order to improve the resetting effect of the trigger assembly 61, the trigger assembly 61 also includes a fourth elastic member 613, which elastically connects the slider 611 and the support 40. The fourth elastic member 613 is used to drive the slider 611 to slide in the opposite direction to reset, so as to reduce the abutment force applied by the rotating member 612 to the first locking member 14.

[0151] like Fig.12 As shown, the pushing member 62 includes a connecting portion 621 and a force-bearing portion 622 . The connecting portion 621 extends substantially along the first direction, and the force-bearing portion 622 extends substantially vertically so as to cooperate and abut with the upper rotating member 612 .

[0152] In this embodiment, the two side brackets 20 are connected to the cross brace 30 through the joints 10, and the two joints 10 are arranged approximately 180 degrees apart, and each joint 10 is correspondingly provided with a linkage mechanism and a push handle 70. Therefore, every time the support 40 rotates 180 degrees, the rotating members 612 in the two linkage mechanisms can cooperate with the corresponding force-bearing parts 622, so as to push the first locking member 14 to move.

[0153] like Fig.13 As shown, the push handle 70 includes a blocking portion 71. When the push handle 70 is in the unfolded state, the blocking portion 71 pushes the slider 611 to slide, so as to drive the rotating member 612 to abut against the pushing member 62, thereby pushing the first locking member 14 to slide in the direction close to the second joint seat 12; when the push handle 70 is in the folded state, as shown in FIG. Fig.14 As shown, the blocking portion 71 and the slider 611 are staggered, the first locking member 14 will be reset under the action of the first reset member 17, pushing the pushing member 62 and the rotating member 612 to reset, and the slider 611 will be reset under the action of the rotating member 612 and the fourth elastic member 613.

[0154] In some embodiments, the linkage mechanism may not be provided with the pushing member 62 , and the rotating member 612 may directly abut against the first locking member 14 to push the first locking member 14 to slide.

[0155] In some embodiments, when the support 40 is rotated into place, regardless of whether the push handle 70 is in the unfolded state, the linkage mechanism can drive the first locking member 14 to slide to lock the first joint seat 11 and the second joint seat 12. Exemplarily, the linkage mechanism includes a rotating member 612 and a fourth elastic member 613, the fourth elastic member 613 is connected to or abuts the rotating member 612, and the fourth elastic member 613 is used to drive the rotating member 612 to rotate in the direction of pushing the first locking member 14. When the support 40 is rotated into place, the rotating member 612 pushes the first locking member 14 under the action of the fourth elastic member 613 to lock the first joint seat 11 and the second joint seat 12. When the support 40 rotates relative to the cross brace 30, the rotating member 612 is staggered from the first locking member 14, and the first locking member 14 is reset under the action of the first reset member 17 to unlock the first joint seat 11 and the second joint seat 12.

[0156] In this embodiment, Fig.14 As shown, when the stroller is in a folded state, the front wheel bracket 21 and the rear wheel bracket 22 in the side bracket 20 are brought close to each other, the cross brace 30 is rotated relative to the side bracket 20, so that the support 40 on the cross brace 30 is rotated to the front side, and the push handle 70 is rotated relative to the support 40 to move closer to the side bracket 20.

[0157] Combination Figure 1As shown, the cross brace 30 includes a cross brace body 31, an upper cover 32, a lower cover 33 and a cross brace shaft 34. The cross brace shaft 34 is disposed on the cross brace body 31. The upper cover 32 and the lower cover 33 are disposed on the upper and lower sides of the cross brace body 31, respectively, and are covered outside the cross brace body 31 to protect the cross brace body 31. The cross brace shaft 34 extends out of the upper cover 32 to be rotatably connected to the support 40.

[0158] In some embodiments, the seat supporting mechanism further includes a seat plate 50, which is disposed on the support 40 to place the seat assembly.

[0159] The process of switching the stroller from the folded state to the unfolded state is as follows:

[0160] Unfold the side bracket 20. Rotate the front wheel bracket 21 or the rear wheel bracket 22 to gradually increase the angle between the front wheel bracket 21 and the rear wheel bracket 22; during the opening of the front wheel bracket 21 and the rear wheel bracket 22, the first joint seat 11 rotates relative to the second joint seat 12, and the first joint seat 11 drives the cross brace 30 to rotate, so that the support 40 on the cross brace 30 is located above the cross brace 30. During the rotation of the first joint seat 11 relative to the second joint seat 12, when the fifth groove section 113 in the first joint seat 11 is aligned with the sixth groove section 124 in the second joint seat 12 to form the first tooth groove 103, the second locking member 16 slides along the first direction toward the first joint seat 11 under the action of the second reset member 19, so that the first locking portion 142 slides into the sixth groove section 124, thereby locking the first joint seat 11 and the second joint seat 12.

[0161] When the third groove section 122 in the second joint seat 12 and the fourth groove section in the third joint seat 13 are aligned to form the second locking groove 102, and the first locking member 14 slides in the direction of locking the first joint seat 11 and the second joint seat 12, the force of the linkage part 162 on the third locking member 15 is reduced, and the third locking member 15 will slide along the first direction toward the second joint seat 12 under the action of the third reset member 18, so that the third locking part 151 slides into the third groove section 122, thereby locking the second joint seat 12 and the third joint seat 13, realizing joint locking, thereby realizing the locking of the side bracket 20, and the locking of the side bracket 20 and the cross brace 30.

[0162] The rotating support 40 adjusts the orientation of the seat assembly so that the seat assembly faces forward or backward. When the support 40 is rotated into place, the rotating member 612 and the pushing member 62 are arranged relative to each other.

[0163] The push handle 70 is unfolded. The push handle 70 is rotated, and the blocking portion 71 on the push handle 70 is rotated to abut against the slider 611, pushing the slider 611 to slide into the support 40, thereby pushing the rotating member 612 to rotate, and the rotating member 612 pushes the pushing member 62, driving the first locking member 14 to approach the second joint seat 12 along the first direction, so that the first locking portion 142 cooperates with the second groove section 121, and the shaking gap between the first joint seat 11 and the second joint seat 12 is eliminated.

[0164] Embodiment 2

[0165] This embodiment provides a child stroller, which is further improved on the basis of the first embodiment to eliminate the shaking gap between the second joint seat 12 and the third joint seat 13 .

[0166] Specifically, along the direction from the third joint seat 13 to the second joint seat 12, at least part of the cross-sectional area of ​​the third locking portion 151 and the second locking groove 102 is gradually reduced, so that at least part of the matching position of the third locking portion 151 and the second locking groove 102 is a match without shaking clearance, thereby improving the stability of the second joint seat 12 and the third joint seat 13 after locking, and reducing the shaking of the joint 10. When the third locking portion 151 slides in the second locking groove 102 and gradually disengages from the second locking groove 102, there is a gap between the third locking portion 151 and the second locking groove 102, and the gap will gradually increase, thereby ensuring that the third locking portion 151 can be smoothly disengaged from the second locking groove 102.

[0167] Along the direction from the third joint seat 13 to the second joint seat 12, the cross-sectional area of ​​the second locking groove 102 gradually decreases, and the shape of the third locking portion 151 is adapted to the shape of the second locking groove 102. Both the second locking groove 102 and the third locking portion 151 have a taper, which improves the locking effect of the third locking portion 151 on the third joint seat 13 and the second joint seat 12, thereby reducing the shaking amount of the joint 10.

[0168] That is to say, along the direction from the third joint seat 13 to the second joint seat 12, the cross-sectional shape of the third locking portion 151 gradually decreases, the cross-sectional areas of the fourth slot segment and the third slot segment 122 gradually decrease, and the minimum cross-sectional area of ​​the fourth slot segment is equal to the maximum cross-sectional area of ​​the third slot segment 122, so that the cross-sectional area of ​​the second locking slot 102 changes continuously.

[0169] Specifically, the shape of the third locking portion 151 is roughly a prism, and correspondingly, the circumferential inner wall of the second locking groove 102 is roughly a prism surface, so as to ensure a gap-free fit between the third locking portion 151 and the second locking groove 102. It should be noted here that each side surface of the third locking portion 151 can be a plane or a curved surface.

[0170] In other embodiments, the shape of the third locking portion 151 may be a pyramid, a frustum, or a cone, so that the cross-sectional area of ​​the third locking portion 151 meets the requirement of a clearance-free fit.

[0171] In some embodiments, along the direction of the third joint seat 13 pointing to the second joint seat 12, the third locking portion 151 may include a fixed section with a fixed cross-sectional area and a gradual section with a gradually decreasing cross-sectional area. Correspondingly, the second locking groove 102 includes a fixed groove section that cooperates with the fixed section and a gradual groove section that cooperates with the gradual section to ensure a gap-free fit. Exemplarily, the fixed section may be a prism section and the gradual section may be a pyramid section.

[0172] In some embodiments, along the direction pointing from the third joint seat 13 to the second joint seat 12, only the cross-sectional area of ​​at least part of the third locking portion 151 or part of the second locking groove 102 can be gradually reduced, which can also reduce or eliminate the fitting clearance, thereby reducing the amount of shaking of the joint 10.

[0173] In some embodiments, along the direction from the third joint seat 13 to the second joint seat 12, the cross-sectional area of ​​one of the third locking portion 151 and the fourth slot segment gradually decreases to prevent the third locking member 15 and the third joint seat 13 from shaking relative to each other. Exemplarily, when the third joint seat 13 and the second joint seat 12 are in a locked state, the cross-sectional area of ​​the third locking portion 151 that matches the fourth slot segment gradually decreases along the direction from the third joint seat 13 to the second joint seat 12, and the cross-sectional area of ​​the fourth slot segment may remain unchanged; or, along the direction from the third joint seat 13 to the second joint seat 12, the cross-sectional area of ​​the fourth slot segment gradually decreases, and when the third joint seat 13 and the second joint seat 12 are in a locked state, the cross-sectional area of ​​the third locking portion 151 that matches the fourth slot segment may remain unchanged.

[0174] In some embodiments, along the direction from the third joint seat 13 to the second joint seat 12, the cross-sectional area of ​​one of the third locking portion 151 and the third slot section 122 gradually decreases to prevent the third locking member 15 from shaking relative to the second joint seat 12. Exemplarily, when the third joint seat 13 and the second joint seat 12 are in a locked state, the cross-sectional area of ​​the third locking portion 151 that matches the third slot section 122 gradually decreases along the direction from the third joint seat 13 to the second joint seat 12, and the cross-sectional area of ​​the third slot section 122 may remain unchanged; or, along the direction from the third joint seat 13 to the second joint seat 12, the cross-sectional area of ​​the third slot section 122 gradually decreases, and when the third joint seat 13 and the second joint seat 12 are in a locked state, the cross-sectional area of ​​the third locking portion 151 that matches the third slot section 122 may remain unchanged.

[0175] Optionally, the third locking member 15 includes a second locking body, the second locking body is arranged on a side of the third joint seat 13 away from the second joint seat 12, and the third locking portion 151 is slidably arranged in the fourth slot section.

[0176] By arranging the second locking body on the side of the third joint seat 13 away from the second joint seat 12, the space between the third joint seat 13 and the second joint seat 12 can be reduced, making the fit between the third joint seat 13 and the second joint seat 12 more compact, thereby reducing the size of the joint and avoiding bloated joints that affect flexibility.

[0177] In addition, the third locking portion 151 is disposed through the third joint seat 13 , and the third locking portion 151 only needs to move a small distance to engage with or disengage from the second slot section 121 in the second joint seat 12 , and the unlocking and locking responses are fast.

[0178] Optionally, there are multiple third locking portions 151 , and the multiple third locking portions 151 are arranged at intervals around the circumference of the second locking body to improve the locking effect of the third joint seat 13 and the second joint seat 12 .

[0179] In this embodiment, the second locking body may be a plate-like structure to reduce the space occupied by the second locking body, so that the third locking member 15 and the third joint seat 13 can be more compactly matched, thereby reducing the size of the joint.

[0180] Embodiment 3

[0181] This embodiment provides a child stroller, which is different from the second embodiment in that a second joint cavity is formed between the third joint seat 13 and the second joint seat 12, and the third locking piece 15 is arranged in the second joint cavity. The third joint seat 13 and the second joint seat 12 can also be locked and unlocked by sliding the third locking piece 15, and the shaking amount of the joint in the locked state can be reduced.

[0182] Since the cross-sectional areas of the third locking portion 151 and the second locking groove 102 are variable, interference will occur when the third locking member 15 is directly assembled with the third joint seat 13 and the second joint seat 12 respectively. In order to facilitate the assembly of the third locking member 15 with the third joint seat 13 and the second joint seat 12 respectively, the third joint seat 13 includes a second joint outer ring and a second end cover that can be detachably connected, the fourth groove section is arranged on the inner wall of the second joint outer ring, and the second end cover is arranged on the side of the second joint outer ring away from the second joint seat 12. When assembling, the second joint outer ring can be assembled with the second joint seat 12 first to form the second locking groove 102, and then the third locking member 15 can be installed in the second locking groove 102 along the direction from the third joint seat 13 to the second joint seat 12, and finally the second end cover is fixed with the second joint outer ring to complete the assembly of the third joint seat 13, the second joint seat 12 and the third locking member 15.

[0183] Optionally, the second joint outer ring and the second end cover may be fixed by snap connection or screws to facilitate disassembly.

[0184] Embodiment 4

[0185] This embodiment provides a child stroller, which is further improved on the basis of the second embodiment.

[0186] In order to improve the locking effect of the third joint seat 13 and the second joint seat 12, a fourth locking piece is slidably arranged in the second joint cavity along the first direction, and the fourth locking piece can lock or unlock the second joint seat 12 and the third joint seat 13. By adding the fourth locking piece, the third joint seat 13 and the second joint seat 12 can be double-locked in cooperation with the third locking piece 15 to ensure the reliability of the third joint seat 13 and the second joint seat 12 when they are in a locked state.

[0187] Specifically, a second tooth groove is provided on the inner wall of the second joint cavity, and the second tooth groove extends to the third joint seat 13 and the second joint seat 12 at both ends along the first direction, that is, the second tooth groove is formed by splicing the third joint seat 13 and the second joint seat 12. The fourth locking member includes a fourth locking portion, and the fourth locking portion is slidably matched with the second tooth groove, so that the fourth locking portion can switch between the state of only matching with the second joint seat 12 or matching with the third joint seat 13 and the second joint seat 12 at the same time, so as to realize the locking and unlocking of the third joint seat 13 and the second joint seat 12.

[0188] Since the third locking piece 15 can achieve a gap-free fit with the third joint seat 13 and the second joint seat 12, thereby eliminating the shaking of the joint 10, in this embodiment, an assembly gap is formed between the fourth locking part and the second tooth groove. On the basis of ensuring that the fourth locking part slides smoothly in the second tooth groove, the processing accuracy requirements are reduced, which is conducive to reducing costs.

[0189] In this embodiment, the cross-sectional areas of the fourth locking portion and the second tooth groove can be fixed along the first direction, which reduces the difficulty of processing the fourth locking member and the second tooth groove and facilitates the assembly of the fourth locking member and the second joint cavity.

[0190] The fourth locking member may be a joint tooth, including a second gear body and a fourth locking portion, the fourth locking portion being convexly arranged on the circumferential outer wall of the second gear body. In order to improve the locking effect of the fourth locking member on the third joint seat 13 and the second joint seat 12, a plurality of fourth locking portions are provided, and the plurality of fourth locking portions are arranged at intervals along the circumference of the second gear body.

[0191] In order to avoid the fourth locking member interfering with the movement of the third locking member 15, when the third joint seat 13 and the second joint seat 12 are in a locked state, the first locking groove 101 and the second tooth groove are alternately arranged along the circumference of the second joint cavity, so that the first locking part 142 and the fourth locking part are alternately staggered to avoid interference between the first locking part 142 and the fourth locking part.

[0192] In this embodiment, the cooperation between the fourth locking member and the second tooth groove can refer to the cooperation between the third locking member 15 and the first tooth groove 103 in the first embodiment. The structure and principle are basically the same and will not be described in detail in this embodiment.

[0193] In some embodiments, only the first locking member 14 and / or at least a portion of the cross-sectional area of ​​the first locking groove 101 can be set to gradually decrease in the direction from the first joint seat 11 to the second joint seat 12, or only the third locking member 15 and / or at least a portion of the cross-sectional area of ​​the second locking groove 102 can be set to gradually decrease in the direction from the third joint seat 13 to the second joint seat 12.

[0194] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cart frame, characterized in that: include: Two side brackets arranged opposite to each other along a first direction; A cross brace supported between the two side brackets; The joint comprises a first joint seat, a second joint seat and a first locking member, wherein the second joint seat is fixed to the side bracket, the first joint seat is fixed to the cross brace, and the first joint seat is rotatably connected to the second joint seat; The first joint seat is provided with a first groove section, the second joint seat is provided with a second groove section, the first groove section and the second groove section can be connected to form a first locking groove, the first locking member includes a first locking portion, and the first locking portion is slidably disposed in the first locking groove along a first direction; Along the first direction, at least a portion of the cross-sectional area of ​​the first locking portion and / or the first locking groove gradually decreases.

2. The stroller frame according to claim 1, characterized in that: The cart frame also includes a seat supporting mechanism movably arranged on the cross brace so that the seat supporting mechanism can be switched between a use position and a non-use position. When the seat supporting mechanism moves to the use position, the seat supporting mechanism engages with the first locking member and pushes the first locking member to move toward the first locking groove.

3. The stroller frame according to claim 2, characterized in that: The first locking member further comprises a first locking body, the first locking portion is fixedly arranged on the first locking body, the first locking body is movably arranged on a side of the first joint seat facing the seat supporting mechanism, the first locking portion penetrates the first joint seat and is extended in the first slot section, and when the seat supporting mechanism moves to the use position, it abuts against the first locking body and pushes the first locking body to move in a direction close to the first joint seat; The cart frame also includes a first reset member, which is arranged between the first locking body and the first joint seat. Under the action of external force, the first locking body moves toward the direction close to the first joint seat, and the first reset member is deformed to accumulate rebound force; after the external force is removed, the first reset member drives the first locking body to reset and move to drive the first locking part to move away from the first locking groove.

4. The stroller frame according to claim 1, characterized in that: Along the direction from the first joint seat to the second joint seat, the cross-sectional area of ​​the first locking groove gradually decreases, and the shape of the first locking portion is adapted to the shape of the first locking groove; Or, along the direction from the first joint seat to the second joint seat, the cross-sectional area of ​​at least one of the first locking portion and the first slot segment gradually decreases, and the cross-sectional area of ​​at least one of the first locking portion and the second slot segment gradually decreases.

5. The stroller frame according to any one of claims 1 to 4, characterized in that: A first joint cavity is formed between the first joint seat and the second joint seat, a first tooth groove is provided on the inner wall of the first joint cavity, and the first tooth groove extends to the first joint seat and the second joint seat at both ends along the first direction; A second locking piece is slidably disposed in the first joint cavity along the first direction. The second locking piece includes a second locking portion. The second locking portion slidably cooperates with the first tooth groove to lock or unlock the second joint seat and the first joint seat.

6. The stroller frame according to claim 5, characterized in that: The second locking portion is matched with the first tooth groove gap along the circumference of the first joint cavity; And / or, when the first joint seat and the second joint seat are locked, the first locking grooves and the first tooth grooves are alternately arranged along the circumference of the first joint cavity.

7. The stroller frame according to claim 5, characterized in that: The joint further comprises a second reset member, the second reset member is connected to or abuts against the second locking member, and the second reset member is used to drive the second locking member to slide in a direction of locking the second joint seat and the first joint seat; the elastic force of the second reset member is directed from the second joint seat to the first joint seat along the first direction; And / or, a plurality of second locking portions are provided, and the plurality of second locking portions are arranged at intervals along the circumference of the first joint cavity to form a fool-proof structure so that the first joint seat and the second joint seat are locked at a unique angle.

8. The stroller frame according to claim 5, characterized in that: The side bracket includes a front wheel bracket and a rear wheel bracket; The joint also includes: A third joint seat, wherein the third joint seat and the first joint seat are respectively located at opposite sides of the second joint seat, the third joint seat and the second joint seat are rotatably connected, and one of the third joint seat and the second joint seat is fixedly connected to the front wheel bracket, and the other is fixedly connected to the rear wheel bracket, so that the side bracket has an unfolded state and a folded state, the second joint seat and the third joint seat enclose a second joint cavity, the inner wall of the second joint cavity is provided with a second locking groove, and the second locking groove extends to the third joint seat and the second joint seat at both ends along the first direction; The third locking member is arranged in the second joint cavity, and the third locking member includes a third locking portion, and the third locking portion is slidably arranged in the second locking groove to lock or unlock the second joint seat and the third joint seat.

9. The stroller frame according to claim 8, characterized in that: The joint further comprises a third resetting member, one end of which is connected to or abuts against the third locking member, and the other end of which is connected to or abuts against the inner wall of the second joint cavity, and the third resetting member is used to drive the third locking member to slide in a direction of locking the second joint seat and the third joint seat; The elastic force of the third resetting member is directed from the third joint seat to the second joint seat along a first direction.

10. The stroller frame according to claim 8, characterized in that: The second locking member further comprises a linkage portion, the linkage portion is slidably disposed in the second joint seat, and the linkage portion is connected to or can abut against the third locking member; When the joint switches from a locked state to an unlocked state, the second locking member moves toward the second joint seat and drives the third locking member to slide toward the direction away from the second joint seat through the linkage portion.

11. The stroller frame according to claim 2 or 3, characterized in that: The seat supporting mechanism comprises: A support, used for mounting the seat assembly, the support being rotatably disposed on the cross brace, and the rotation axis being perpendicular to the first direction, so as to switch the orientation of the seat assembly; A linkage mechanism is provided between the support and the first locking member, and the linkage mechanism can push the first locking member to slide after the support is rotated to a working state or after the support is rotated to a working state, so that the first locking member locks the first joint seat and the second joint seat; A push handle, movably disposed on the support, so that the push handle has an unfolded state and a folded state; When the push handle is in the unfolded state, the push handle triggers the linkage mechanism so that the linkage mechanism pushes the first locking member; When the push handle is in the folded state, the push handle is disengaged from the linkage mechanism, the linkage mechanism is reset, and the first locking member is disengaged from the second joint seat.

12. The stroller frame according to claim 11, characterized in that: The linkage mechanism comprises: A slider is slidably arranged on the support, and a limiting groove is arranged on the slider; A rotating member, the middle portion of which is rotatably connected to the support, one end of the rotating member extends into the limiting groove, and the other end of the rotating member is used to abut against the first locking member; The push handle includes a blocking portion. When the push handle is in an unfolded state, the blocking portion pushes the slider to slide, so as to drive the rotating member to abut against the first locking member. When the push handle is in a folded state, the blocking portion and the slider are staggered. A fourth elastic member, one end of which is connected to or abuts against the support, and the other end of which is connected to or abuts against the slider, and the direction of the elastic force of the fourth elastic member is opposite to the force of the blocking portion on the slider.

13. A child stroller, characterized in that: The invention comprises a seat assembly and a stroller frame according to any one of claims 1 to 12, wherein the seat assembly is mounted on the stroller frame.

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