Folding cart

Abstract

The invention relates to a folding cart 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 present invention relates to the technical field of child strollers, and in particular to a foldable 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] The existing child stroller needs at least three operations to be performed during the folding process, namely, folding the backrest and the seat, unlocking the front legs and the rear legs, and folding the front legs and the rear legs. These three operations need to be completed separately to fold the stroller. The folding operation is not smooth and inconvenient to use. Summary of the invention

[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 object, the inventor provides a foldable stroller having an unfolded state and a folded state, comprising:

[0006] First leg assembly,

[0007] Second leg assembly,

[0008] A joint assembly, comprising a first rotating block and a second rotating block which are pivotally connected, and a locking member movably arranged between the first rotating block and the second rotating block, wherein the locking member is used to limit or unlock the relative rotation of the first rotating block and the second rotating block; the first rotating block is connected to a first leg assembly, and the second rotating block is connected to a 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 brought together or opened apart;

[0009] And a seat assembly, including an unlocking structure, a backrest and a seat plate, the backrest and the seat plate are capable of being 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 direction of the pivoting center axis of the first rotating block and the second rotating block.

[0011] Furthermore, the locking piece is circumferentially provided with a locking portion, a first locking groove adapted to the locking portion is provided on a side of the first rotating block facing the locking portion, and a second locking groove adapted to the locking portion is provided on a side of the second rotating block facing the locking portion, and 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] Further, the locking member is provided with a plurality of locking parts in the circumference thereof, and a locking member through hole is provided in the center of the locking member, and the locking member is pivotally connected to the first rotating block and / or the second rotating block via the locking member through hole.

[0013] Further, 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 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 direction of the pivot center axis and push the locking member to achieve sliding, so as to unlock the first rotating block and the second rotating block;

[0014] The joint assembly further includes a first elastic member, two ends of which are connected between the locking member and the second rotating block, so that the locking member can be slidably 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 comprises a pushing member, one end of which is connected to the locking member, and the other end of which is in abutment with the unlocking structure, and the unlocking structure achieves sliding movement by the pushing member pushing the locking member.

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

[0018] A push member mounting hole for inserting the push member is provided on one side of the locking member facing the first rotating block, and a third elastic member is arranged between the push member and the push member mounting hole, so that the push 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 one 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 where the two parallel portions are located are perpendicular to the direction of the pivot center axis 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 is used to connect a handle, the handle base block is pivotally connected to the second rotating block / the first rotating block, the handle has 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. Furthermore,

[0023] Different from the prior art, 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, so that the first leg assembly and the second leg assembly can be brought together or opened. During the folding operation of the folding cart, the folding of the seat plate and the unlocking of the two leg assemblies are completed at the same time, which reduces the folding steps and improves the user experience. In addition, the present invention combines the unlocking structure between the backrest and the joint assembly, and there is no need to set up a complex unlocking structure outside the joint assembly, which simplifies the structure of the folding cart and helps 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 without a seat assembly installed in this embodiment;

[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 a first rotating member of this embodiment;

[0030] Figure 7 is a schematic diagram of a 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] Fig. 9 is a schematic diagram of the backrest of this embodiment;

[0033] Fig.10 A schematic diagram of the unlocking structure of this embodiment;

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

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

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

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

[0038] Description of reference numerals:

[0039] X, direction of pivot center axis;

[0040] 1. The first leg assembly;

[0041] 2. Second leg assembly;

[0042] 3. Joint components;

[0043] 31. The first rotating block;

[0044] 311, first locking groove;

[0045] 312, stop part;

[0046] 313, slot;

[0047] 32. The second rotating block;

[0048] 321, second locking groove;

[0049] 322, pivot center axis;

[0050] 33. Locking piece;

[0051] 331, locking part;

[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. a first elastic member;

[0059] 38. a 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 schemes that can be implemented, and the purposes and effects that can be achieved, 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 the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0073] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0074] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document 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 an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0076] In the present 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 relationship of quantity, priority or sequence between these entities or operations.

[0077] Without further limitations, in this application, the words "include", "comprises", "has" 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 limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0078] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, 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 way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0079] In the description of the embodiments of the present application, 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 referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot 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 such as "install", "connect", "connect", "fix", "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 it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, 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 legs and rear legs of a child stroller will be locked after being opened to prevent the front legs and rear legs from being folded by mistake when the child is sitting on the stroller, causing harm to the child. In the process of folding the child stroller, the locking structure of the front legs and rear legs needs to be unlocked first. The existing unlocking structure of a child stroller usually has an unlocking button set in the middle of the stroller handle, and the unlocking button needs to be triggered separately to complete the unlocking operation; or a bendable structure is set on the handle, and the unlocking operation is completed by operating the bendable structure. These unlocking structures not only require a separate unlocking operation, but also require an unlocking structure to be set on the handle, and a lifting steel wire runs through the stroller handle, which has a relatively complex structure.

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

[0083] First leg assembly 1,

[0084] Second leg assembly 2,

[0085] The joint assembly 3 comprises a first rotating block 31 and a second rotating block 32 which are pivotally connected, and a locking member 33 which is movably arranged between the first rotating block 31 and the second rotating block 32, wherein 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, and 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 are relatively brought together or opened;

[0086] And a seat assembly 4, including an unlocking structure 43, a backrest 41 and a seat plate 42, the backrest 41 and the seat plate 42 are able to be folded or unfolded by relative rotation, 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 around the pivot center axis 322 therebetween. The pivot center axis 322 can be a connecting axis arranged on the first rotating block 31, or a connecting axis arranged on the second rotating block 32, or two connecting axes arranged on the first rotating block 31 and the second rotating block 32, or a connecting axis arranged 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. Both the first rotating block 31 and the second rotating block 32 can rotate around the pivot center axis 322. The direction of the pivot center axis 322 refers to the direction of the central axis of the pivot center axis 322. Of course, the pivot center axis 322 can also be virtual. After the first rotating block 31 and the second rotating block 32 are buckled, they can rotate relative to each other. Then the rotation axis between the two is the direction of the pivot center 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, the seat plate 42 will be driven 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 cart is folded, the pivot center axis 322 of the first leg assembly 1 and the second leg assembly 2 may be coaxial with the pivot center axis 322 of the first rotating block 31 and the second rotating block 32, or parallel to the pivot center 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, the first leg assembly 1 and the second leg assembly 2 may be driven to move closer to or apart from each other respectively; for another example, the second leg assembly 2 may be connected to the first rotating block 31 / the second rotating block 32 through a connecting rod slider structure, and during the relative rotation of the first rotating block 31 and the second rotating block 32, the second leg assembly 2 may be driven to rotate closer to the first leg assembly 1, or driven to move apart from the first leg assembly 1 through the connecting rod slider structure. That is, 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 may be driven to move closer to or apart from each other.

[0090] When the folding cart is folded, when the backrest 41 is folded toward the seat plate 42, the relative rotation between the first rotating block 31 and the second rotating block 32 can be unlocked, so that the first leg assembly 1 and the second leg assembly 2 can be brought together or opened. The unlocking structure 43 is set between the backrest 41 and the joint assembly 3. During the folding operation, the folding of the seat plate 42 and the unlocking of the two leg assemblies are completed at the same time, which reduces the folding steps and improves the user experience; and the unlocking structure 43 is combined between the backrest 41 and the joint assembly 3, so there is no need to set a complex unlocking structure 43 outside the joint assembly 3, which simplifies the structure of the folding cart and helps reduce production costs.

[0091] like Fig.13 , Fig.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 the two cannot rotate relative to each other. When the locking member 33 completely disengages from the first rotating block 31 and enters into the second rotating block 32, the locking 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 into the first rotating block 31, so that the locking 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 center 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 circumferentially provided with a locking portion 331. 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, the second rotating block 32 is provided with a second locking groove 321 adapted to the locking portion 331 on one side thereof facing the locking portion 331. When the locking portion 331 is adapted to the first locking groove 311 and the second locking groove 321 at the same time, the first rotating block 31 and the second rotating block 32 are restricted from rotating. In this embodiment, the locking member 33 is a disc-shaped structure, and the locking portion 331 is a block-shaped structure protruding on its circumference. The thickness of the locking portion 331 can be uniformly set to the thickness of other positions of the locking piece 33, the first locking groove 311 and the second locking groove 321 are set to be groove-shaped structures that are adapted to the overall shape of the locking piece 33, and the locking piece 33 as a whole is adapted to the first locking groove 311 and the second locking groove 321; or the thickness of the locking portion 331 is set to be greater than the thickness of other positions of the locking piece 33, the shape of the second locking groove 321 can be set to be adapted to the locking piece 33 as a whole, the shape of the first locking groove 311 is only adapted to the locking portion 331, and when the locking portion 331 is stuck in the first locking groove 311, the relative rotation between the first rotating block 31 and the second rotating block 32 can be limited. Of course, the shape of the first locking groove 311 can also be set to be adapted to the overall locking piece 33, the shape of the second locking groove 321 is only adapted to the locking portion 331, and when the locking portion 331 is stuck in the second locking groove 321, the relative rotation between the first rotating block 31 and the second rotating block 32 can be limited. The disc-shaped locking piece 33 is sleeved 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 through a connecting shaft to prevent the locking piece 33 from shaking in the joint assembly 3 and generating abnormal noise when the folding cart is on a bumpy road.

[0094] In some other embodiments, the locking member 33 is a block 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, the relative rotation of the first rotating block 31 and the second rotating block 32 can be limited.

[0095] like Figure 4 , Figure 5As shown, in some more preferred embodiments, the locking member 33 is provided with a plurality of locking portions 331 in the circumferential direction, and a locking member through hole 332 is provided in the center of the locking member 33, and the locking member 33 is pivotally connected with the first rotating block 31 and / or the second rotating block 32 through the locking member through hole 332. After the plurality of locking portions 331 are provided in the circumferential direction on the locking member 33, a centrally symmetrical locking member 33 is formed, and the use of the locking member 33 can improve the overall stability of the joint assembly 3 and further optimize the anti-seismic performance of the locking member 33. Specifically, a connecting shaft is provided in the center of the second rotating block 32, and a connecting hole of the first rotating block 31 is provided in the center of the first rotating block 31. The locking member through hole 332 and the connecting hole of the first rotating block 31 are both sleeved on the connecting shaft, and the first rotating block 31 can rotate around the connecting shaft, and the locking member 33 can move along the connecting shaft. A convex block that can fit into the gap between the locking portions 331 is also provided in the second locking groove 321, so as to further improve the compactness of the structure and avoid shaking and abnormal noise.

[0096] like Figure 8 , Fig. 9 , Fig.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, and 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 be slidably 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 away from the first guide portion 411, that is, the rotation of the backrest 41 pushes the unlocking structure 43 to move 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 leg assembly 1 and the second leg assembly 2 are opened, the backrest 41 is unfolded, and the first guide portion 411 no longer presses 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 rotating block 31 and the second rotating block 32 to limit the relative rotation of the two. At the same time, the unlocking structure 43 returns to abut against the backrest 41 to prepare for the next unlocking action. In order to facilitate the fixing of the first elastic member 37, a first elastic member 37 installation groove 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 installation groove and extends outward to abut against the inner wall of the second rotating block 32.

[0099] The above-mentioned 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 Fig.14As shown, in some preferred embodiments, the joint assembly 3 further includes a second elastic member 38, the seat plate 42 is arranged between the backrest 41 and the first rotating block 31, and the two ends of the second elastic member 38 are connected between the unlocking structure 43 and the seat plate 42, so that the unlocking structure 43 fits the backrest 41. During the folding process of the backrest 41, when the unlocking structure 43 is squeezed by the first guide portion 411, the second elastic member 38 is compressed and stored. When the backrest 41 is unfolded, under the elastic force of the second elastic member 38, the unlocking structure 43 is quickly reset to maintain its fit state with the backrest 41, thereby improving the compactness of the structure. In order to facilitate the fixing of the second elastic member 38, a second elastic member installation groove 434 is provided on the side of the unlocking structure 43 facing the seat plate 42, and the second elastic member 38 is inserted into the second elastic member installation groove 434 and extends outward to abut against the inner wall of the seat plate 42. Of course, like the first elastic member 37, the second elastic member 38 can also be set as a tensile elastic member, and the setting principle is the same, which will not be repeated here.

[0101] like Fig.12 , Fig.13 As shown, in some embodiments, the joint assembly 3 further includes a push member 34, one end of which is connected to the locking member 33, and the other end of which is in contact with the unlocking structure 43. The unlocking structure 43 pushes the locking member 33 to achieve sliding movement by the push member 34. The lengths of the unlocking structure 43 and the push member 34 are both extended along the pivot center axis direction X, and the two are arranged in the same direction. The push force of the unlocking structure 43 acts on the locking member 33 through the push member 34. In order to fix the push member 34, a push member 34 installation groove can be provided on the side of the locking member 33 facing the unlocking structure 43. The push member 34 is inserted into the push member 34 installation groove and extends outward to abut against the unlocking structure 43. The push member 34 provides length compensation for the unlocking structure 43, and the unlocking structure 43 and the push member 34 can be arranged to be relatively short, so as to facilitate installation in the seat assembly 4 and the joint assembly 3.

[0102] like Fig.11 , Fig.12 , Fig.13 As shown, in some embodiments, the seat assembly 4 further includes a first disassembly key 35, the first disassembly key 35 slides through the seat plate 42 or the backrest 41 from the outside to the inside, 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 to 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, and 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 both ends of the unlocking structure 43, the first guide portion 411 is provided at one end of the unlocking structure 43 facing the backrest 41, and the third guide portion 432 is provided at one end away from the backrest 41. In order to make the assembly relationship between the unlocking structure 43 and the first disassembly key 35 more stable, two third guide portions 432 can be symmetrically provided on the unlocking structure 43, and similarly, two fourth guide portions 351 are also provided on the first disassembly key 35, and the fourth guide portions 351 are adapted one by one to the third guide portions 432.

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

[0106] The length extension direction of the first disassembly key 35 is perpendicular to the pivot center axis direction X. A disassembly hole is provided on the side of the seat assembly 4 facing the joint assembly 3, and the push piece 34 protrudes from the surface of the joint assembly 3 along the pivot center axis direction X. When the seat assembly 4 is assembled to the joint assembly 3, the protruding part of the push piece 34 extends into the disassembly hole to fix the seat assembly 4. When the seat assembly 4 needs to be disassembled, the protruding part of the push piece 34 is pressed into the joint assembly 3 through the first disassembly key 35, so that the seat assembly 4 can be separated 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, which are conventional designs in the field and will not be repeated 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 key 35 is pressed into the joint assembly 3, the third guide portion 432 moves to abut against the fourth guide portion 351. The first disassembly key 35 continuously applies force to the unlocking structure 43, and the pushing member 34 pushes the locking member 33 to move away from the unlocking structure 43. The pushing member 34 is squeezed to complete the separation of the seat assembly 4 and the joint assembly 3. During the separation process, the locking member 33 can be kept locked between the first rotating block 31 and the second rotating block 32, so that the first leg assembly 1 and the second leg assembly 2 maintain a stable unfolding structure.

[0108] During the squeezing of the push member 34, the third elastic member is compressed and deformed, and the push member 34 moves into the push member installation 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 is restored to its initial position under the elastic force of the third elastic member, and can pass through the disassembly hole and protrude on the surface of the joint assembly 3. The push member installation hole 333 not only provides a mounting position for the third elastic member, but also provides a guide for the movement of the push member 34.

[0109] like Figure 2 , Figure 3 As shown, in some other embodiments, the seat assembly 4 further includes a second disassembly key 36, and a stopper 312 is provided on the side of the joint assembly 3 facing the seat assembly 4. The second disassembly key 36 is slidably connected to the seat plate 42 through a fourth elastic member, and abuts against the bottom of the stopper 312. Specifically, the stopper 312 of the joint assembly 3 can be specifically on the end surface of the first rotating block 31 facing the seat assembly 4, and 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, and the slot 313 and the stopper 312 can be an integrally formed design. The stopper 312 can be specifically a step-shaped structure or a groove-shaped structure, which can be adapted to stop with the second disassembly key 36. When the seat assembly 4 is installed in the joint assembly 3, the fourth elastic member is squeezed. When the seat assembly 4 is installed in place, the fourth elastic member pushes the second disassembly key 36 toward the stopper 312 under the action of elastic force, and snaps into the bottom of the stopper 312. The two ends of the fourth elastic member are stopped between the seat plate 42 and the second disassembly key 36. In this embodiment, the second disassembly key 36 is usually arranged parallel or nearly parallel to the seat plate 42. The second disassembly key 36 can also be arranged below the seat plate 42. When in use, the seat plate 42 will cover the second disassembly key 36, which improves the aesthetics of the cart and can also prevent the second disassembly key 36 from being accidentally touched. In addition, the second disassembly key 36 is arranged below the seat plate 42, which saves the installation space in the joint assembly 3 and can reduce the thickness of the joint assembly 3 in the direction X of the pivot center axis.

[0110] like Figure 9-11As shown, in some embodiments, the backrest 41 is further provided with a first parallel portion 412, the first parallel portion 412 is connected to the first guide portion 411, and the unlocking structure 43 is provided with a second parallel portion 433, the second parallel portion 433 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 where the two parallel portions are located are 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 the travel of the second parallel portion 433 along the first parallel portion 412 is greater than the length of the travel of the second guide portion 431 along the first guide portion 411. After the first parallel portion 412 and the second parallel portion 433 are arranged, when the first parallel portion 412 and the second parallel portion 433 are in contact, the backrest 41 will not apply pressure to the unlocking structure 43, that is, will not squeeze the locking member 33 to move. Only when the first guide portion 411 of the backrest 41 and the second guide portion 431 of the unlocking structure 43 are in contact, will the locking member 33 be squeezed to move. Such a structural design shortens the effective folding travel (the squeezing travel on the unlocking structure 43) between the backrest 41 and the seat plate 42, which is conducive to making the unlocking structure 43 compact. 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 first parallel portion 412 and the second parallel portion 433 abutting against each other 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 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 to the seat plate 42, the first parallel portion 412 and the second parallel portion 433 are abutted against 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 abutted against each other to drive the locking member 33 to move.

[0113] like Figure 1 , Figure 2As shown, in some embodiments, the folding cart further comprises a handle base block 51, the handle base block 51 is used to connect a handle 52, the handle base block 51 is pivotally connected to the second rotating block 32 / the first rotating block 31, and the handle 52 has a working position away from the first leg assembly 1 and the first leg assembly 1, and a folding position close to the first leg assembly 1 / the first leg assembly 1. The handle 52 is sleeved on the outside of the handle base block 51. When the folding cart of the present invention is unlocked after the first leg assembly 1 and the second leg assembly 2, the handle 52 can be pulled (or the lifting rod at the bottom of the seat assembly 4 can be pulled) to pull the cart upward as a whole, and the first leg assembly 1 and the second leg assembly 2 are folded together under the action of their own weight. In some use scenarios, after the first leg assembly 1 and the second leg assembly 2 are folded, the handle 52 can be directly pulled to make the wheels of the first leg assembly 1 or the wheels of the second leg assembly 2 roll forward on the ground, and the folding cart can be moved without carrying the entire weight of the folding cart. Of course, the handle base block 51 is provided with an unlocking gear and a locking gear of the handle 52, and a switch key between the unlocking gear and the locking gear is provided on the handle 52. By operating the switch key, the handle base block 51 and the first rotating block 31 / the second rotating block 32 can be restricted or unlocked, so that the handle 52 can be moved closer to or opened relative to the first leg assembly 1 and the second leg assembly 2. The folding, unlocking and locking structure of the handle 52 in the present invention can refer to the related art of folding strollers, and will not be elaborated 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 then 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 concept 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 foldable stroller having an unfolded state and a folded state, characterized in that: include: First leg assembly, Second leg assembly, A joint assembly, comprising a first rotating block and a second rotating block which are pivotally connected, and a locking member movably arranged between the first rotating block and the second rotating block, wherein the locking member is used to limit or unlock the relative rotation of the first rotating block and the second rotating block; the first rotating block is connected to a first leg assembly, and the second rotating block is connected to a 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 brought together or opened apart; And a seat assembly, including an unlocking structure, a backrest and a seat plate, the backrest and the seat plate are capable of being 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 cart 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, a first locking groove adapted to the locking portion is provided on a side of the first rotating block facing the locking portion, and a second locking groove adapted to the locking portion is provided on a side of the second rotating block 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, characterized in that: The locking member is provided with a plurality of locking parts in the circumferential direction, and a locking member through hole is provided in the center of the locking member, and the locking member is pivotally connected with 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 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 direction and push the locking member to achieve sliding, so as to unlock the first rotating block and the second rotating block; The joint assembly further includes a first elastic member, two ends of which are connected between the locking member and the second rotating block, so that the locking member can be slidably 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, and two 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 is in contact with the unlocking structure. The unlocking structure achieves sliding movement by the pushing member pushing the locking member.

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

10. The folding cart 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 where the two parallel portions are located are perpendicular to the direction of the pivot center axis 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, characterized in that: The folding cart also includes a handle base block, which is used to connect a handle, and the handle base block is pivotally connected to the second rotating block / the first rotating block. The handle has 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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