Folding cart

Abstract

The utility model relates to a folding push which comprises a first leg assembly, a second leg assembly, a joint assembly, a first rotating block, a second rotating block and a locking piece, wherein the first rotating block and the second rotating block are connected in a pivoted mode, and the locking piece is movably arranged between the first rotating block and the second rotating block. The locking piece is used for limiting or unlocking relative rotation of the first rotating block and the second rotating block; the seat assembly comprises an unlocking structure, a backrest and a seat plate, the backrest / seat plate is connected to the joint assembly in a pivoted mode, the unlocking structure is arranged between the backrest and the joint assembly, and when the backrest is folded towards the seat plate, the unlocking structure is arranged between the backrest and the joint assembly. And the unlocking structure drives the locking piece to slide so as to unlock the first rotating block and the second rotating block, so that the first rotating block and the second rotating block can rotate relatively. The unlocking structure is arranged between the backrest and the joint assembly, in the folding operation, folding of the seat plate and unlocking of the two leg assemblies are completed at the same time, the folding steps are reduced, and the user experience is improved. And the structure of the folding cart is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of child strollers, in particular to a folding stroller. Background Art

[0002] Strollers meet the rigid needs of parent-child travel. When used outside, the stroller can be folded so that it can be easily placed in the trunk or the narrow aisle of public transportation.

[0003] Existing child strollers require at least three operations during the folding process, namely folding the backrest and seat, unlocking the front legs and rear legs, and folding the front legs and rear legs. These three operations need to be completed separately to fold the stroller. The folding operation is not smooth and inconvenient to use. Utility Model Content

[0004] Therefore, it is necessary to provide a foldable stroller to solve the problem that the folding operation of existing child strollers is complicated.

[0005] To achieve the above objectives, the inventor provides a foldable stroller having an unfolded state and a folded state, comprising:

[0006] The first leg assembly has a first wheel at the bottom.

[0007] The second leg assembly has a second wheel at the bottom.

[0008] The joint assembly includes a first rotating block and a second rotating block that are pivotally connected, and a locking member movably disposed between the first rotating block and the second rotating block, the locking member being used to restrict or unlock relative rotation of the first rotating block and the second rotating block; the first rotating block is connected to the first leg assembly, and the second rotating block is connected to the second leg assembly, and when the first rotating block and the second rotating block rotate relative to each other, the first leg assembly and the second leg assembly are relatively moved closer or apart;

[0009] And a seat assembly, including an unlocking structure, a backrest and a seat plate, the backrest and the seat plate are able to be folded or unfolded by relative rotation, the seat assembly is connected to the joint assembly, the unlocking structure is arranged between the backrest and the joint assembly, when the backrest is folded toward the seat plate, the unlocking structure drives the locking member to slide to unlock the first rotating block and the second rotating block, so that the two can rotate relative to each other.

[0010] Furthermore, the locking member slides along the pivot center axis direction of the first rotating block and the second rotating block.

[0011] Furthermore, the locking piece is circumferentially provided with a locking portion, and the first rotating block is provided with a first locking groove adapted to the locking portion on a side facing the locking portion, and the second rotating block is provided with a second locking groove adapted to the locking portion on a side facing the locking portion. When the locking portion is adapted to the first locking groove and the second locking groove at the same time, the rotation between the first rotating block and the second rotating block is restricted.

[0012] Furthermore, the locking member is circumferentially provided with a plurality of locking portions, and a locking member through hole is provided at the center of the locking member, and the locking member is pivotally connected to the first rotating block and / or the second rotating block through the locking member through the locking member through hole.

[0013] Furthermore, the backrest is provided with a first guide portion, the first rotating block is provided between the second rotating block and the seat assembly, the unlocking structure is provided through the first rotating block, and the unlocking structure is provided with a second guide portion, and the first guide portion cooperates with the second guide portion, so that when the backrest and the seat plate are relatively rotated and folded, the unlocking structure is driven to move along the pivot center axis and push the locking member to achieve sliding, thereby unlocking the first rotating block and the second rotating block;

[0014] The joint assembly further includes a first elastic member, both ends of which are connected between the locking member and the second rotating block, so that the locking member can slide and reset to limit the rotation of the first rotating block and the second rotating block.

[0015] Furthermore, the joint assembly also includes a second elastic member, the seat plate is arranged between the backrest and the first rotating block, and both ends of the second elastic member are connected between the unlocking structure and the seat plate, so that the unlocking structure fits the backrest.

[0016] Furthermore, the joint assembly further includes a pushing member, one end of which is connected to the locking member, and the other end of which abuts against the unlocking structure, and the unlocking structure achieves sliding by the pushing member pushing the locking member.

[0017] Furthermore, the seat assembly further includes a first disassembly key, which slides through the seat plate or the backrest from the outside to the inside, and the unlocking structure is provided with a third guide portion, and the first disassembly key is provided with a fourth guide portion, and the third guide portion cooperates with the fourth guide portion, so that the first disassembly key slides to push the unlocking structure and squeeze the pushing member away from the seat assembly along the pivot center axis direction of the first rotating block and the second rotating block, so as to separate the seat assembly from the joint assembly;

[0018] A pushing member mounting hole for inserting the pushing member is provided on one side of the locking member facing the first rotating block, and a third elastic member is provided between the pushing member and the pushing member mounting hole, so that the pushing member can slide and reset along the direction of the pivot center axis.

[0019] Furthermore, the seat assembly also includes a second disassembly key, and a stop portion is provided on the side of the joint assembly facing the seat assembly. The second disassembly key is slidably connected to the seat plate through a fourth elastic member and abuts against the bottom of the stop portion.

[0020] Furthermore, the backrest is further provided with a first parallel portion, the first parallel portion is connected to the first guide portion, and the unlocking structure is provided with a second parallel portion, the second parallel portion is connected to the second guide portion;

[0021] The first parallel portion is parallel to the second parallel portion, and the planes on which the two parallel portions are located are perpendicular to the pivot center axis direction of the first rotating block and the second rotating block, so that when the first parallel portion is adapted to the second parallel portion, the unlocking structure will not move in the direction of the pivot center axis.

[0022] Furthermore, the folding cart further comprises a handle base block, the handle base block being used to connect a handle, the handle base block being pivotally connected to the second rotating block / the first rotating block, the handle having a working position away from the first leg assembly and the first leg assembly, and a folding position close to the first leg assembly / the first leg assembly.

[0023] Different from the existing technology, the above technical solution has the following advantages: In the folding cart, the unlocking structure is arranged between the backrest and the joint assembly. When the backrest is folded toward the seat plate, the unlocking structure drives the locking member to slide, thereby unlocking the relative rotation between the first rotating block and the second rotating block, allowing the first leg assembly and the second leg assembly to be brought together or opened. During the folding operation, the folding of the seat plate and the unlocking of the two leg assemblies are completed simultaneously, reducing the folding steps and improving the user experience. In addition, the utility model combines the unlocking structure between the backrest and the joint assembly, eliminating the need for a complex unlocking structure outside the joint assembly, simplifying the structure of the folding cart and helping to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional diagram of a folding cart according to the present embodiment;

[0025] Figure 2 This is a schematic diagram of a folding stroller according to this embodiment without a seat assembly installed;

[0026] Figure 3 This is a schematic diagram of the seat assembly of this embodiment;

[0027] Figure 4 is a schematic diagram of the locking member of this embodiment;

[0028] Figure 5 is another schematic diagram of the locking member of this embodiment;

[0029] Figure 6 is a schematic diagram of the first rotating member of this embodiment;

[0030] Figure 7 is a schematic diagram of the second rotating member of this embodiment;

[0031] Figure 8 This is a schematic diagram of the connection between the unlocking structure and the backrest of this embodiment;

[0032] Figure 9 is a schematic diagram of the backrest of this embodiment;

[0033] Figure 10 This is a schematic diagram of the unlocking structure of this embodiment;

[0034] Figure 11 This is another schematic diagram of the unlocking structure of this embodiment;

[0035] Figure 12 This is a schematic diagram of the connection between the unlocking structure, the first disassembly key and the pushing member of this embodiment;

[0036] Figure 13 is a cross-sectional view of the joint assembly of this embodiment;

[0037] Figure 14 This is another cross-sectional view of the joint assembly of this embodiment.

[0038] Description of reference numerals:

[0039] X, direction of pivot axis;

[0040] 1. First leg assembly;

[0041] 2. Second leg assembly;

[0042] 3. Joint components;

[0043] 31. First rotating block;

[0044] 311, first locking groove;

[0045] 312, stop part;

[0046] 313, slot;

[0047] 32. Second rotating block;

[0048] 321, second locking groove;

[0049] 322, pivot axis;

[0050] 33. Locking piece;

[0051] 331, locking portion;

[0052] 332, locking member through hole;

[0053] 333, push piece mounting hole;

[0054] 34. Push piece;

[0055] 35. First disassembly key;

[0056] 351, fourth guide portion;

[0057] 36. Second disassembly key;

[0058] 37. First elastic member;

[0059] 38. second elastic member;

[0060] 4. Seat assembly;

[0061] 41. Backrest;

[0062] 411, first guide portion;

[0063] 412, first parallel section;

[0064] 42. Seat plate;

[0065] 43. Unlock structure;

[0066] 431, second guide portion;

[0067] 432, third guide portion;

[0068] 433, second parallel section;

[0069] 434, second elastic member mounting slot;

[0070] 51. Handle base block;

[0071] 52. Handle. DETAILED DESCRIPTION

[0072] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0073] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0074] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0075] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0076] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0077] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0078] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0079] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0080] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication 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 those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0081] The front and rear legs of a stroller lock after being opened to prevent accidental folding of the legs while a child is seated, potentially causing injury. To fold the stroller, the locking mechanisms for the front and rear legs must first be unlocked. Existing unlocking mechanisms for strollers typically employ an unlocking button located in the middle of the handle, which must be triggered separately to unlock the stroller. Alternatively, a flexible structure is incorporated into the handle to unlock the stroller. These unlocking mechanisms not only require a separate unlocking operation but also require the handle to be equipped with an unlocking mechanism, with a steel wire running through the handle, resulting in a complex structure.

[0082] See also Figures 1 to 4 as well as Figures 13 and 14 As shown, this embodiment provides a foldable stroller having an unfolded state and a folded state, including:

[0083] The first leg assembly 1 has a first wheel at the bottom.

[0084] The second leg assembly 2 has a second wheel at the bottom.

[0085] The joint assembly 3 includes a first rotating block 31 and a second rotating block 32 that are pivotally connected, and a locking member 33 movably disposed between the first rotating block 31 and the second rotating block 32. The locking member 33 is used to limit or unlock the relative rotation of the first rotating block 31 and the second rotating block 32. The first rotating block 31 is connected to the first leg assembly 1, and the second rotating block 32 is connected to the second leg assembly 2. When the first rotating block 31 and the second rotating block 32 rotate relative to each other, the first leg assembly 1 and the second leg assembly 2 move closer to or apart from each other.

[0086] And the seat assembly 4 includes an unlocking structure 43, a backrest 41 and a seat plate 42, the backrest 41 and the seat plate 42 rotate relative to each other and can be folded or unfolded, the seat assembly 4 is connected to the joint assembly 3, the unlocking structure 43 is arranged between the backrest 41 and the joint assembly 3, when the backrest 41 is folded toward the seat plate 42, the unlocking structure 43 drives the locking member 33 to slide to unlock the first rotating block 31 and the second rotating block 32, so that the two can rotate relative to each other.

[0087] The first rotating block 31 and the second rotating block 32 are coaxially arranged and can rotate about the pivot axis 322 therebetween. The pivot axis 322 can be a connecting axis provided on the first rotating block 31, or a connecting axis provided on the second rotating block 32, or two connecting axes provided on the first rotating block 31 and the second rotating block 32, or a connecting axis provided independently of the first rotating block 31 and the second rotating block 32. The connecting axis fixes the first rotating block 31 and the second rotating block 32, and both the first rotating block 31 and the second rotating block 32 can rotate about the pivot axis 322. The direction of the pivot axis 322 refers to the direction of the central axis of the pivot axis 322. Of course, the pivot axis 322 can also be virtual. After the first rotating block 31 and the second rotating block 32 are engaged, they can rotate relative to each other. In this case, the rotation axis between them is the direction of the pivot axis 322.

[0088] The seat assembly is connected to the joint assembly. Specifically, the seat plate is arranged between the backrest 41 and the first rotating block 31. After the seat plate 42 is inserted into the first rotating block 31, the seat plate 42 and the first rotating block 31 form a whole. When the first rotating block 31 rotates, it will drive the seat plate 42 to rotate synchronously, and the backrest rotates on the seat plate around the pivot center axis 322 to achieve folding or unfolding.

[0089] When the stroller is folded, the pivot axis 322 of the first leg assembly 1 and the second leg assembly 2 can be coaxial with, or parallel to, the pivot axis 322 of the first rotating block 31 and the second rotating block 32. For example, when the first rotating block 31 and the second rotating block 32 rotate relative to each other, they can respectively drive the first leg assembly 1 and the second leg assembly 2 to move closer to or apart from each other. For another example, the second leg assembly 2 can be connected to the first rotating block 31 / the second rotating block 32 via a connecting rod and slider structure. During the relative rotation of the first rotating block 31 and the second rotating block 32, the connecting rod and slider structure can drive the second leg assembly 2 to rotate closer to the first leg assembly 1, or drive the second leg assembly 2 to move away from the first leg assembly 1. In other words, when the first rotating block 31 and the second rotating block 32 rotate relative to each other, they can drive the first leg assembly 1 and the second leg assembly 2 to move closer to or apart from each other.

[0090] When folding the folding stroller, folding the backrest 41 toward the seat plate 42 unlocks the relative rotation between the first and second rotating blocks 31, 32, allowing the first and second leg assemblies 1, 2 to move closer or open. The unlocking structure 43 is positioned between the backrest 41 and the joint assembly 3. During the folding operation, the seat plate 42 is folded and the two leg assemblies are unlocked simultaneously, reducing the number of folding steps and improving the user experience. Furthermore, the unlocking structure 43 is integrated between the backrest 41 and the joint assembly 3, eliminating the need for a complex unlocking structure 43 outside the joint assembly 3. This simplifies the structure of the folding stroller and helps reduce production costs.

[0091] like Figure 13 、 Figure 14 As shown, in some embodiments, the locking member 33 slides along the pivot center axis direction X of the first rotating block 31 and the second rotating block 32. When the locking member 33 is simultaneously arranged between the first rotating block 31 and the second rotating block 32, the first rotating block 31 and the second rotating block 32 are restricted by the locking member 33 and cannot rotate relative to each other. When the locking member 33 completely disengages from the first rotating block 31 and enters the second rotating block 32, the lock between the first rotating block 31 and the second rotating block 32 is removed, and the first rotating block 31 and the second rotating block 32 can rotate. Of course, the locking member 33 can also be set to completely disengage from the second rotating block 32 and enter the first rotating block 31, so that the lock between the first rotating block 31 and the second rotating block 32 is removed, and the first rotating block 31 and the second rotating block 32 can rotate.

[0092] In some other embodiments, the locking member 33 may also move along a direction perpendicular to the pivot axis 322 of the first rotating block 31 and the second rotating block 32 to unlock the relative rotation of the first rotating block 31 and the second rotating block 32 .

[0093] like Figure 4 、 Figure 5 As shown in some preferred embodiments, the locking member 33 is provided with a locking portion 331 in the circumferential direction. Figure 6 As shown, a first locking groove 311 adapted to the locking portion 331 is provided on one side of the first rotating block 31 facing the locking portion 331. Figure 7 As shown, a second locking groove 321 is provided on the side of the second rotating block 32 facing the locking portion 331, which is adapted to the locking portion 331. When the locking portion 331 is adapted to both the first locking groove 311 and the second locking groove 321, rotation between the first rotating block 31 and the second rotating block 32 is restricted. In this embodiment, the locking member 33 is a disc-shaped structure, and the locking portion 331 is a block-shaped structure protruding from its circumference. When the cam 331 is in the unlock state, the cam 331 is locked and the unlocking mechanism 331 is unlocked. The disc-shaped locking member 33 is disposed between the first rotating block 31 and the second rotating block 32 and is coaxially arranged with the first rotating block 31 and the second rotating block 32. It can be connected to the first rotating block 31 or the second rotating block 32 via a connecting shaft to prevent the locking member 33 from shaking in the joint assembly 3 and generating abnormal noise when the folding stroller is on bumpy roads.

[0094] In some other embodiments, the locking member 33 is a block-shaped structure eccentrically arranged relative to the pivot center axis 322 of the first rotating block 31 and the second rotating block 32, and one end of the locking member 33 is always adapted in the first locking groove 311 or the second locking groove 321 for fixation. When the locking member 33 is adapted in the first locking groove 311 and the second locking groove 321 at the same time, it can limit the relative rotation of the first rotating block 31 and the second rotating block 32.

[0095] like Figure 4 、 Figure 5As shown, in certain more preferred embodiments, the locking member 33 is circumferentially provided with multiple locking portions 331, and a locking member through-hole 332 is centrally provided on the locking member 33. The locking member 33 is pivotally connected to the first rotating block 31 and / or the second rotating block 32 via the locking member through-hole 332. The circumferential provision of multiple locking portions 331 on the locking member 33 forms a centrally symmetrical locking member 33. Using this locking member 33 can improve the overall stability of the joint assembly 3 and further optimize the seismic performance of the locking member 33. Specifically, a connecting shaft is centrally provided on the second rotating block 32, and a connecting hole for the first rotating block 31 is centrally provided on the first rotating block 31. Both the locking member through-hole 332 and the connecting hole for the first rotating block 31 are sleeved on the connecting shaft, allowing the first rotating block 31 to rotate about the connecting shaft, and the locking member 33 to move along the connecting shaft. The second locking groove 321 is also provided with a protrusion that fits into the gaps between the locking portions 331, further improving the compactness of the structure and preventing shaking and abnormal noise.

[0096] like Figure 8 、 Figure 9 、 Figure 14 As shown, in some embodiments, a first guide portion 411 is provided on the backrest 41, the first rotating block 31 is arranged between the second rotating block 32 and the seat assembly 4, the unlocking structure 43 is arranged through the first rotating block 31, and a second guide portion 431 is provided on the unlocking structure 43. The first guide portion 411 cooperates with the second guide portion 431, so that when the backrest 41 and the seat plate 42 are relatively rotated and folded, the unlocking structure 43 is driven to move along the pivot center axis direction X and push the locking member 33 to achieve sliding, so as to unlock the first rotating block 31 and the second rotating block 32.

[0097] The joint assembly 3 further includes a first elastic member 37 , both ends of which are connected between the locking member 33 and the second rotating block 32 , so that the locking member 33 can slide and reset to limit the rotation of the first rotating block 31 and the second rotating block 32 .

[0098] The first guide portion 411 and the second guide portion 431 are inclined surfaces with the same inclination direction. When the backrest 41 is rotated and folded, the first guide portion 411 moves to abut against the second guide portion 431, and the backrest 41 applies force to the unlocking structure 43. The backrest 41 continues to rotate and fold, and the backrest 41 continues to apply force to the unlocking structure 43. Since the backrest 41 can only rotate around the joint assembly 3, the second guide portion 431 is pushed by the first guide portion 411 to move in the direction away from the first guide portion 411, that is, the rotation of the backrest 41 pushes the unlocking structure 43 away from the backrest 41, thereby pushing the locking member 33 to compress the first elastic member 37 and disengage from the first rotating block 31, so that the first rotating block 31 and the second rotating block 32 can rotate relative to each other to fold the first leg assembly 1 and the second leg assembly 2. After the first and second leg assemblies 1 and 2 are opened, the backrest 41 is unfolded. The first guide portion 411 no longer compresses the second guide portion 431. Under the elastic force of the first elastic member 37, the locking member 33 is pushed back between the first and second rotating blocks 31 and 32, restricting their relative rotation. Simultaneously, the unlocking structure 43 returns to its original position against the backrest 41, preparing for the next unlocking action. To facilitate the securing of the first elastic member 37, a first elastic member 37 mounting slot is provided on the side of the locking member 33 facing the second rotating block 32. The first elastic member 37 is inserted into the first elastic member 37 mounting slot and extends outward to abut the inner wall of the second rotating block 32.

[0099] The above embodiment provides a compressed first elastic member 37. Of course, the first elastic member 37 can also be set between the first rotating block 31 and the locking member 33. When the locking member 33 unlocks the first rotating block 31 and the second rotating block 32, the first elastic member 37 is in a stretched state, and the elastic force of the first elastic member 37 can pull the locking member 33 back between the first rotating block 31 and the second rotating block 32.

[0100] like Figure 14As shown, in certain preferred embodiments, the joint assembly 3 further includes a second elastic member 38. The seat plate 42 is disposed between the backrest 41 and the first rotating block 31. The two ends of the second elastic member 38 are connected between the unlocking structure 43 and the seat plate 42, allowing the unlocking structure 43 to engage with the backrest 41. When the backrest 41 is folded, the unlocking structure 43 is compressed by the first guide portion 411, and the second elastic member 38 is compressed and accumulates force. When the backrest 41 is unfolded, the elastic force of the second elastic member 38 quickly returns the unlocking structure 43 to its original position, maintaining its engagement with the backrest 41 and improving the compactness of the structure. To facilitate securing the second elastic member 38, a second elastic member mounting groove 434 is provided on the side of the unlocking structure 43 facing the seat plate 42. The second elastic member 38 is inserted into the second elastic member mounting groove 434 and extends outward to abut the inner wall of the seat plate 42. Of course, similar to the first elastic member 37, the second elastic member 38 can also be configured as a tensile elastic member. The configuration principle is the same and will not be further described here.

[0101] like Figure 12 、 Figure 13 As shown, in some embodiments, the joint assembly 3 further includes a pusher 34, one end of which is connected to the locking member 33 and the other end of which abuts the unlocking structure 43. The unlocking structure 43 slides by pushing against the locking member 33 via the pusher 34. The unlocking structure 43 and the pusher 34 both extend along the pivot axis direction X and are arranged in the same direction. The pushing force of the unlocking structure 43 is applied to the locking member 33 via the pusher 34. To secure the pusher 34, a mounting slot for the pusher 34 can be provided on the side of the locking member 33 facing the unlocking structure 43. The pusher 34 is inserted into the mounting slot and extends outward to abut the unlocking structure 43. The pusher 34 provides length compensation for the unlocking structure 43, allowing both the unlocking structure 43 and the pusher 34 to be relatively short for easier installation within the seat assembly 4 and the joint assembly 3.

[0102] like Figure 11 、 Figure 12 、 Figure 13 As shown, in some embodiments, the seat assembly 4 further includes a first disassembly key 35, which slides from the outside to the inside through the seat plate 42 or the backrest 41, and the unlocking structure 43 is provided with a third guide portion 432. The first disassembly key 35 is provided with a fourth guide portion 351. The third guide portion 432 cooperates with the fourth guide portion 351, so that the first disassembly key 35 slides to push the unlocking structure 43 and squeeze the pushing member 34 away from the seat assembly 4 along the pivot center axis direction X of the first rotating block 31 and the second rotating block 32, so as to separate the seat assembly 4 from the joint assembly 3;

[0103] The locking member 33 is provided with a pushing member mounting hole 333 for inserting the pushing member 34 on one side facing the first rotating block 31. A third elastic member is provided between the pushing member 34 and the pushing member mounting hole 333 so that the pushing member 34 can slide and reset along the pivot center axis direction X.

[0104] In the embodiment in which the third guide portion 432 is provided, the first guide portion 411 and the third guide portion 432 are respectively provided at opposite ends of the unlocking structure 43. The first guide portion 411 is provided at the end of the unlocking structure 43 facing the backrest 41, and the third guide portion 432 is provided at the end facing away from the backrest 41. To further secure the assembly between the unlocking structure 43 and the first release key 35, two third guide portions 432 may be symmetrically provided on the unlocking structure 43. Similarly, the first release key 35 is also provided with two fourth guide portions 351, which mate one-to-one with the third guide portions 432.

[0105] The first disassembly key 35 is selectively provided on the seat plate 42 or the backrest 41 to achieve a detachable connection between the seat assembly 4 and the joint assembly 3. In this embodiment, the first disassembly key 35 is usually provided on the seat plate 42, and when the folding stroller is in the unfolded state of use, the first disassembly key 35 extends vertically upward. Specifically, if the seat plate 42 is provided between the backrest 41 and the first rotating block 31, the first disassembly key 35 can be provided on the seat plate 42, so that the first disassembly key 35 is closer to the push member 34, and the disassembly structure is simpler. The seat assembly 4 can be removed as a whole through the first disassembly key 35. If the backrest 41 is provided between the seat plate 42 and the first rotating block 31, the first disassembly key 35 can be provided on the backrest 41 to achieve the same effect.

[0106] The length of the first disassembly key 35 extends perpendicularly to the pivot axis direction X. A disassembly hole is defined on the side of the seat assembly 4 facing the joint assembly 3. A push member 34 protrudes from the surface of the joint assembly 3 along the pivot axis direction X. When the seat assembly 4 is assembled to the joint assembly 3, the protruding portion of the push member 34 extends into the disassembly hole to secure the seat assembly 4. To disassemble the seat assembly 4, the protruding portion of the push member 34 is pressed into the joint assembly 3 using the first disassembly key 35, thereby separating the seat assembly 4 from the joint assembly 3. Of course, the load-bearing capacity of the seat assembly 4 also depends on the connection structure between the seat assembly 4 and other parts. These are conventional designs in the art and will not be discussed further here.

[0107] The third guide portion 432 and the fourth guide portion 351 are inclined surfaces with the same inclination direction. When the first disassembly button 35 is pressed into the joint assembly 3, the third guide portion 432 moves until it contacts the fourth guide portion 351. The first disassembly button 35 then continuously applies force to the unlocking structure 43, causing the pushing member 34 to push the locking member 33 away from the unlocking structure 43. This compresses the pushing member 34, thereby completing the separation of the seat assembly 4 from the joint assembly 3. During this separation process, the locking member 33 maintains the lock between the first rotating block 31 and the second rotating block 32, maintaining the first leg assembly 1 and the second leg assembly 2 in a stable deployed configuration.

[0108] During the squeezing of the push member 34, the third elastic member is compressed and deformed, causing the push member 34 to move into the push member mounting hole 333 until it is separated from the seat assembly 4. When the squeezing force of the first disassembly key 35 is removed, the push member 34, under the elastic force of the third elastic member, returns to its original position and is able to protrude through the disassembly hole onto the surface of the joint assembly 3. The push member mounting hole 333 not only provides a mounting position for the third elastic member, but also serves as a guide for the movement of the push member 34.

[0109] like Figure 2 、 Figure 3 As shown, in certain other embodiments, the seat assembly 4 further includes a second removal key 36. A stopper 312 is provided on the side of the joint assembly 3 facing the seat assembly 4. The second removal key 36 is slidably connected to the seat plate 42 via a fourth elastic member and abuts against the underside of the stopper 312. Specifically, the stopper 312 of the joint assembly 3 can be located on the end surface of the first rotating block 31 facing the seat assembly 4. A slot 313 for inserting the seat assembly 4 is also provided on the end surface of the first rotating block 31 facing the seat assembly 4. The slot 313 and the stopper 312 can be integrally formed. The stopper 312 can be a stepped or groove-like structure that fits snugly against the second removal key 36. When the seat assembly 4 is installed in the joint assembly 3, the fourth elastic member is compressed. Once the seat assembly 4 is fully installed, the elastic force of the fourth elastic member pushes the second removal key 36 toward the stopper 312, where it snaps into place. The ends of the fourth elastic member abut between the seat plate 42 and the second release button 36. In this embodiment, the second release button 36 is typically arranged parallel or nearly parallel to the seat plate 42. Alternatively, the second release button 36 can be arranged below the seat plate 42. During use, the seat plate 42 will shield the second release button 36, enhancing the stroller's aesthetics and preventing accidental activation of the second release button 36. Furthermore, placing the second release button 36 below the seat plate 42 saves installation space within the joint assembly 3 and reduces the thickness of the joint assembly 3 in the direction of the pivot axis X.

[0110] like Figure 9-11As shown, in some embodiments, the backrest 41 is further provided with a first parallel portion 412, which is connected to the first guide portion 411, and the unlocking structure 43 is provided with a second parallel portion 433, which is connected to the second guide portion 431;

[0111] The first parallel portion 412 is parallel to the second parallel portion 433, and the planes on which the two parallel portions are located are both perpendicular to the pivot center axis direction X of the first rotating block 31 and the second rotating block 32, so that when the first parallel portion 412 and the second parallel portion 433 are adapted, the unlocking structure 43 will not move in the pivot center axis direction X.

[0112] The length of travel of the second parallel portion 433 along the first parallel portion 412 is greater than the length of travel of the second guide portion 431 along the first guide portion 411. With the first parallel portion 412 and the second parallel portion 433 in place, when the first parallel portion 412 and the second parallel portion 433 abut, the backrest 41 does not apply pressure to the unlocking structure 43, i.e., does not force the locking member 33 to move. The locking member 33 is only forced to move when the first guide portion 411 of the backrest 41 abuts the second guide portion 431 of the unlocking structure 43. This structural design shortens the effective folding distance between the backrest 41 and the seat panel 42 (the distance required to press the unlocking structure 43), facilitating a more compact unlocking structure 43. The first parallel portion 412 and the second parallel portion 433 can be designed at the last section of the folding stroke of the backrest 41 and the seat plate 42, that is, when the backrest 41 is just folded from the unfolded state to the seat plate 42, the first guide portion 411 and the second guide portion 431 directly abut against each other, driving the locking member 33 to move and unlock the first rotating block 31 and the second rotating block 32. After the stroke of the first guide portion 411 and the second guide portion 431 is completed, the transition is to the abutment between the first parallel portion 412 and the second parallel portion 433 to completely fold the backrest 41 and the seat plate 42. Of course, the first parallel portion 412 and the second parallel portion 433 can also be designed to be at the front end of the folding stroke of the backrest 41 and the seat plate 42, that is, when the backrest 41 is just folded from the unfolded state toward the seat plate 42, the first parallel portion 412 and the second parallel portion 433 are in contact with each other, and when the backrest 41 is close to the seat plate 42, the first guide portion 411 and the second guide portion 431 are directly in contact with each other to drive the locking member 33 to move.

[0113] like Figure 1 、 Figure 2As shown, in some embodiments, the folding stroller further includes a handle base 51, which is used to connect a handle 52. The handle base 51 is pivotally connected to the second rotating block 32 / the first rotating block 31. The handle 52 has a working position away from the first leg assembly 1 and the first leg assembly 1, and a folded position closer to the first leg assembly 1 / the first leg assembly 1. The handle 52 is sleeved onto the outside of the handle base 51. After the first leg assembly 1 and the second leg assembly 2 are unlocked, the handle 52 can be pulled (or the lifting rod at the bottom of the seat assembly 4 can be pulled) to lift the stroller as a whole upward, causing the first leg assembly 1 and the second leg assembly 2 to fold together under their own weight. In some usage scenarios, after the first leg assembly 1 and the second leg assembly 2 are folded, the handle 52 can be directly pulled to cause the wheels of the first leg assembly 1 or the second leg assembly 2 to roll forward on the ground, allowing the folding stroller to be moved without bearing the entire weight of the stroller. Of course, the handle base 51 is provided with an unlocking position and a locking position for the handle 52. A toggle button for unlocking and locking the positions is provided on the handle 52. By operating the toggle button, the handle base 51 and the first rotating block 31 / second rotating block 32 can be restricted or unlocked, allowing the handle 52 to move closer to or open relative to the first leg assembly 1 and the second leg assembly 2. The folding, unlocking, and locking structures of the handle 52 in the present invention can be referenced to the related art of folding strollers and will not be further described here.

[0114] Based on the above description, the folding cart of the present invention is provided with an unlocking structure 43 and a locking member 33. During the folding process of the backrest, the unlocking structure 43 can drive the locking member to move between the first rotating block 31 and the second rotating block 32 to complete the unlocking of the first rotating block and the second rotating block, and the subsequent folding operation of the first leg assembly 1 and the second leg assembly 2 can be carried out, which has higher portability and better user experience.

[0115] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A folding cart having an unfolded state and a folded state, characterized in that: include: The first leg assembly has a first wheel at the bottom. The second leg assembly has a second wheel at the bottom. The joint assembly includes a first rotating block and a second rotating block that are pivotally connected, and a locking member movably disposed between the first rotating block and the second rotating block, the locking member being used to restrict or unlock relative rotation of the first rotating block and the second rotating block; the first rotating block is connected to the first leg assembly, and the second rotating block is connected to the second leg assembly, and when the first rotating block and the second rotating block rotate relative to each other, the first leg assembly and the second leg assembly are relatively moved closer or apart; And a seat assembly, including an unlocking structure, a backrest and a seat plate, the backrest and the seat plate are able to be folded or unfolded by relative rotation, the seat assembly is connected to the joint assembly, the unlocking structure is arranged between the backrest and the joint assembly, when the backrest is folded toward the seat plate, the unlocking structure drives the locking member to slide to unlock the first rotating block and the second rotating block, so that the two can rotate relative to each other.

2. The folding stroller according to claim 1, characterized in that: The locking member slides along the pivot center axis direction of the first rotating block and the second rotating block.

3. The folding stroller according to claim 2, characterized in that: The locking piece is circumferentially provided with a locking portion, and the first rotating block is provided with a first locking groove adapted to the locking portion on a side facing the locking portion, and the second rotating block is provided with a second locking groove adapted to the locking portion on a side facing the locking portion. When the locking portion is adapted to the first locking groove and the second locking groove at the same time, the rotation between the first rotating block and the second rotating block is restricted.

4. The folding stroller according to claim 3, wherein: The locking member is provided with a plurality of locking portions in a circumferential direction, and a locking member through hole is provided in the center of the locking member. The locking member is pivotally connected to the first rotating block and / or the second rotating block through the locking member through the locking member through hole.

5. The folding stroller according to claim 2, characterized in that: The backrest is provided with a first guide portion, the first rotating block is provided between the second rotating block and the seat assembly, the unlocking structure is provided through the first rotating block, and the unlocking structure is provided with a second guide portion, the first guide portion and the second guide portion cooperate so that when the backrest and the seat plate are relatively rotated and folded, the unlocking structure is driven to move along the pivot center axis and push the locking member to achieve sliding, thereby unlocking the first rotating block and the second rotating block; The joint assembly further includes a first elastic member, both ends of which are connected between the locking member and the second rotating block, so that the locking member can slide and reset to limit the rotation of the first rotating block and the second rotating block.

6. The folding stroller according to claim 5, characterized in that: The joint assembly further includes a second elastic member. The seat plate is disposed between the backrest and the first rotating block. Both ends of the second elastic member are connected between the unlocking structure and the seat plate, so that the unlocking structure fits the backrest.

7. The folding stroller according to claim 5, characterized in that: The joint assembly further comprises a pushing member, one end of which is connected to the locking member, and the other end of which abuts against the unlocking structure. The unlocking structure achieves sliding movement by pushing the locking member through the pushing member.

8. The folding stroller according to claim 7, characterized in that: The seat assembly further includes a first disassembly key, which slides through the seat plate or the backrest from the outside to the inside, and the unlocking structure is provided with a third guide portion, and the first disassembly key is provided with a fourth guide portion, and the third guide portion cooperates with the fourth guide portion, so that the first disassembly key slides to push the unlocking structure and squeeze the pushing member away from the seat assembly along the pivot center axis direction of the first rotating block and the second rotating block, so as to separate the seat assembly from the joint assembly; A pushing member mounting hole for inserting the pushing member is provided on one side of the locking member facing the first rotating block, and a third elastic member is provided between the pushing member and the pushing member mounting hole, so that the pushing member can slide and reset along the direction of the pivot center axis.

9. The folding stroller according to claim 5, characterized in that: The seat assembly further includes a second disassembly key. A stop portion is provided on a side of the joint assembly facing the seat assembly. The second disassembly key is slidably connected to the seat plate via a fourth elastic member and abuts against the bottom of the stop portion.

10. The folding stroller according to any one of claims 5, 6, 8 or 9, characterized in that: The backrest is further provided with a first parallel portion, the first parallel portion is connected to the first guide portion, and the unlocking structure is provided with a second parallel portion, the second parallel portion is connected to the second guide portion; The first parallel portion is parallel to the second parallel portion, and the planes on which the two parallel portions are located are perpendicular to the pivot center axis direction of the first rotating block and the second rotating block, so that when the first parallel portion is adapted to the second parallel portion, the unlocking structure will not move in the direction of the pivot center axis.

11. The foldable stroller according to claim 1, wherein: The folding cart further includes a handle base block, the handle base block being used to connect a handle, the handle base block being pivotally connected to the second rotating block / the first rotating block, the handle having a working position away from the first leg assembly and the first leg assembly, and a folding position close to the first leg assembly / the first leg assembly.

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