Folding apparatus for stroller and stroller

Abstract

A folding apparatus for a stroller and a stroller, the stroller comprising a push handle set (110), a front leg set (120), and a rear leg set (130), and the folding apparatus (140) comprising a first connecting member (141), a second connecting member (142), and a third connecting member (143). The first connecting member (141) is oppositely fixedly connected to the push handle set (110) and is rotatably connected to the front leg set (120); the second connecting member (142) is rotatably connected to the first connecting member (141) and is oppositely fixedly connected to the rear leg set (130); and the third connecting member (143) is rotatably connected to the second connecting member (142) and is slidably connected to the front leg set (120). The first connecting member (141), the second connecting member (142), and the third connecting member (143) form a connecting rod and slider mechanism.

Description

Folding device of cart and cart

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 7, 2024, with application number 202410173099.9 and application name “Folding device for cart and cart”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of carts, and in particular to a folding device for a cart and a cart. Background Art

[0004] Baby strollers are an important tool for assisting with childcare in daily life. They allow babies to lie down, lie half-lying, sit up, and other positions, making them convenient for taking babies out for play. As people's demands for baby stroller functionality continue to increase, existing baby strollers with mealtime convenience functions include a frame and a meal tray assembly. Front and rear foot assemblies are mounted on the front and rear bottoms of the frame, respectively, and a push handle assembly is provided on the rear side of the frame. A connecting rod is typically provided between the front and rear foot assemblies, and a support rod is provided between the rear foot assembly and the push handle assembly. This complex linkage and numerous rods can easily cause the stroller to become stuck or malfunction during unfolding and folding. Furthermore, the rods themselves are relatively long and heavy, making the stroller less portable overall. Summary of the Invention

[0005] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, one purpose of the present application is to propose a folding device for a cart. By constructing a connecting rod slider mechanism, the rotational movement of the handle group and the front leg group is converted into the sliding movement of the connecting part when the cart is folded. The linkage relationship is simple, and the cart is not prone to getting stuck during the unfolding and folding process; by simplifying the connecting rods and support rods between the front leg group, the rear leg group and the handle group into smaller connecting parts, the overall structure of the cart is simpler, the production cost is low, and the cart has a small volume and light weight after folding.

[0007] According to the folding device of the cart in the embodiment of the present application, the cart includes a handle group, a front leg group and a rear leg group, and the folding device includes a first connecting member, a second connecting member and a third connecting member, the first connecting member is used to relatively fixedly connect the handle group and rotatably connect the front leg group; the second connecting member is rotatably connected to the first connecting member, and is used to relatively fixedly connect the rear leg group; the third connecting member is rotatably connected to the second connecting member, and is used to slidably connect the front leg group, wherein the first connecting member, the second connecting member and the third connecting member constitute a connecting rod slider mechanism.

[0008] According to the folding device of the cart in the embodiment of the present application, a connecting rod slider mechanism is constructed by constructing the first connecting member, the second connecting member and the third connecting member, so that the rotational movement of the handle group and the front leg group when the cart is folded is converted into the sliding movement of the third connecting member. The linkage relationship is simple, and the cart is not prone to getting stuck during the unfolding and folding process; by simplifying the connecting rods and support rods between the front leg group, the rear leg group and the handle group into smaller connecting members, the overall structure of the cart is simpler, the production cost is low, and the cart has a small volume and light weight after folding.

[0009] In addition, the folding device of the cart according to the above embodiment of the present application may also have the following additional technical features:

[0010] Optionally, the first connecting member has a first main body, a first end and a second end, the first main body is connected between the first end and the second end, the first main body is rotatably connected to the second connecting member, the first end is used to connect the push handle group, and the second end is used to rotatably connect the front foot group.

[0011] Optionally, the first end portion extends along a first predetermined direction, and the second end portion is configured to extend along the first predetermined direction and be in an arc shape inclined toward the second connecting member in a direction away from the first main body portion.

[0012] Optionally, the second connecting member includes a second main body and a first branch, one end of the second main body is rotatably connected to the first connecting member, and the other end is used to connect to the rear foot group, the first branch is connected to the second main body and extends obliquely in a direction away from the second main body toward the direction away from the one end of the second main body, and the first branch is rotatably connected to the third connecting member.

[0013] Optionally, the third connecting member includes a third main body and a second branch, the third main body is used to slideably connect the front foot group, the second branch is connected to the third main body, and extends obliquely in a direction away from the third main body toward a direction close to the second connecting member, and the second branch is rotatably connected to the second connecting member.

[0014] Optionally, the folding device also includes a locking structure, which includes a plurality of first teeth, a plurality of second teeth, a third tooth and a driving unit, wherein the plurality of first teeth are spaced apart around the rotation axis of the first connecting member and the second connecting member, and the plurality of second teeth are around the rotation axis, one of the plurality of first teeth and the plurality of second teeth is provided on the first connecting member, and the other is provided on the second connecting member; the third tooth is engaged with the second tooth and is movable along the rotation axis, and the third tooth has a first position and a second position, in the first position the third tooth is engaged with the second tooth, and in the second position the third tooth is out of engagement with the second tooth; the driving unit is used to drive the third tooth.

[0015] Another object of the present application is to provide a stroller comprising the aforementioned stroller folding device.

[0016] According to the cart in the embodiment of the present application, the cart includes the folding device, handle group, front leg group and rear leg group described in any one of the above items; the first connecting member is relatively fixedly connected to the handle group and rotatably connected to the front leg group; the second connecting member is relatively fixedly connected to the rear leg group; and the third connecting member is slidably connected to the front leg group.

[0017] According to the cart in the embodiment of the present application, by applying the aforementioned cart folding device, rotatable connections are formed between the handle group and the front leg group, between the handle group and the rear leg group, and between the rear leg group and the front leg group, so that the cart can be quickly folded or unfolded by pressing or lifting the handle group.

[0018] Optionally, the push handle group includes a first connecting rod, the rear foot group includes a second connecting rod, and the front foot group includes a third connecting rod. One end of the first connecting rod is plugged into the first connecting member, the second connecting rod is plugged into the second connecting member, one end of the third connecting rod is rotatably connected to the first connecting member, and the third connecting member is sleeved and slidably connected to the third connecting rod.

[0019] Optionally, the cart further comprises a tray assembly, the tray assembly comprising a tray and a buckle, the tray having a positioning slot; the buckle is rotatably connected to the tray and has a locked state and an unlocked state, wherein in the locked state the buckle extends from the side wall of the positioning slot, and in the unlocked state the buckle exits the positioning slot; wherein the folding device further comprises a mounting seat, the mounting seat being provided in the positioning slot and being able to slide out along the extension direction of the positioning slot, the buckle being used to unlock and lock the mounting seat.

[0020] Optionally, a positioning slot is provided on the mounting seat, and the buckle is embedded in the positioning slot in the locked state and exits the positioning slot in the unlocked state.

[0021] Optionally, one end of the positioning slot has an opening for the mounting seat to slide in and out, and the side of the buckle close to the opening in the locked state is constructed as a wedge-shaped slope, which is used to push the buckle to the unlocked state when the mounting seat slides into the positioning slot.

[0022] Optionally, the tray assembly further includes a reset member having an elastic force for driving the buckle to the unlocked state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a cart in some embodiments of the present application.

[0024] FIG2 is a schematic structural diagram of a folding device of a cart in some embodiments of the present application.

[0025] FIG3 is a schematic structural diagram of a locking structure of a folding device in some embodiments of the present application.

[0026] FIG4 is a partial enlarged view of area B in FIG3 of the present application.

[0027] FIG5 is a schematic structural diagram of a tray of a cart in some embodiments of the present application.

[0028] FIG6 is a cross-sectional view of a tray assembly and a mounting base of a cart in some embodiments of the present application.

[0029] FIG7 is a partial enlarged view of area C in FIG6 of the present application.

[0030] FIG8 is a schematic diagram of the structure of the cart after folding in some embodiments of the present application.

[0031] Figure numerals: cart 100, handle assembly 110, front leg assembly 120, rear leg assembly 130, folding device 140, first connecting member 141, second connecting member 142, third connecting member 143, first rotation point 144, second rotation point 145, third rotation point 146, first main body 141a, first end 141b, second end 141c, second main body 142a, first branch 142b, third main body 143a, second branch 143b, locking structure 150, first tooth 151, second tooth 152, third tooth 153, driving part 154, first connecting rod 111, second connecting rod 131, third connecting rod 121, tray assembly 160, tray 161, buckle 162, positioning slide groove 163, mounting seat 164, positioning slot 165, reset member 166, canopy assembly 170. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0036] This application provides a folding device 140 for a stroller 100 and a stroller 100, which are described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own focus. For details not described in one embodiment, please refer to the relevant descriptions of other embodiments.

[0037] An embodiment of the present application is described in detail below. As shown in Figure 1, according to the folding device 140 of the cart 100 in the embodiment of the present application, the cart 100 includes a handle group 110, a front leg group 120 and a rear leg group 130. The folding device 140 includes a first connecting member 141, a second connecting member 142 and a third connecting member 143. The first connecting member 141 is used to relatively fixedly connect the handle group 110 and rotatably connect the front leg group 120; the second connecting member 142 is rotatably connected to the first connecting member 141 and is used to relatively fixedly connect the rear leg group 130; the third connecting member 143 is rotatably connected to the second connecting member 142 and is used to slidably connect the front leg group 120, wherein the first connecting member 141, the second connecting member 142 and the third connecting member 143 construct a connecting rod slider mechanism.

[0038] Specifically, referring to FIG. 1 , the cart 100 may include a handle assembly 110, a front leg assembly 120, and a rear leg assembly 130. The handle assembly 110 may be the handle portion of the cart 100, which can be conveniently grasped or directly touched by the user to push or pull the cart 100, thereby controlling the direction and speed of movement of the cart 100. The front leg assembly 120 may be the front support structure of the cart 100, supporting the front weight of the cart 100 and helping the front wheels steer on the ground. The rear leg assembly 130 may be the rear support structure of the cart 100, supporting the rear weight of the cart 100 and maintaining the stability of the cart 100. The cooperation between the front leg assembly 120 and the rear leg assembly 130 can maintain the balance of the cart 100, preventing it from tipping or sliding when parked, and maintaining stability during movement. The folding device 140 of the cart 100 enables the cart 100 to fold and unfold. The folding device 140 may include a first connecting member 141, a second connecting member 142, and a third connecting member 143. The first connecting member 141 is used to relatively fixedly connect the handle assembly 110 and rotatably connect the front leg assembly 120. Through the first connecting member 141, a rotatable connection is established between the handle assembly 110 and the front leg assembly 120, and the rotational connection point between the handle assembly 110 and the front leg assembly 120 is a first rotation point 144. The second connecting member 142 is rotationally connected to the first connecting member 141 and is used to relatively fixedly connect the rear leg assembly 130. Through the rotational connection between the second connecting member 142 and the first connecting member 141, a rotatable connection is formed between the rear leg assembly 130 and the handle assembly 110, and the rotational connection point between the rear leg assembly 130 and the handle assembly 110 is a second rotation point 145. The third connecting member 143 is rotationally connected to the second connecting member 142 and is used to slidably connect to the front leg assembly 120. The rotational connection between the third connecting member 143 and the second connecting member 142 forms a rotatable connection between the rear leg assembly 130 and the front leg assembly 120. The third connecting member 143 can slide relative to the front leg assembly 120, and the rotational connection point between the rear leg assembly 130 and the front leg assembly 120 is a third rotation point 146. The first connecting member 141, the second connecting member 142, and the third connecting member 143 form a connecting rod and slider mechanism. The third connecting member 143 is a sliding sleeve or slider that can slide within a certain range under the drive of the connecting rod to achieve connection and transmission between the handle assembly 110, the front leg assembly 120, and the rear leg assembly 130, allowing the stroller 100 to be quickly folded or unfolded when needed.

[0039] 1 and 2 , when folding the stroller 100, the handle assembly 110 is pressed toward the rear leg assembly 130, causing the handle assembly 110 to rotate clockwise about the second rotation point 145 and move closer to the rear leg assembly 130, while simultaneously driving the front leg assembly 120 to rotate counterclockwise about the first rotation point 144. The third connecting member 143 slides downward along the front leg assembly 120 while simultaneously rotating counterclockwise about the third rotation point 146 and moving closer to the rear leg assembly 130. When unfolding the stroller 100, the handle assembly 110 is lifted away from the rear leg assembly 130. The handle assembly 110 rotates counterclockwise about the second rotation point 145 and away from the rear leg assembly 130, while simultaneously driving the front leg assembly 120 to rotate clockwise about the first rotation point 144. The third connecting member 143 slides upward along the front leg assembly 120 while simultaneously rotating clockwise about the third rotation point 146 and moving away from the rear leg assembly 130.

[0040] According to the folding device 140 of the cart 100 in the embodiment of the present application, a connecting rod slider mechanism is constructed by the first connecting member 141, the second connecting member 142 and the third connecting member 143, so that the rotational movement of the handle group 110 and the front leg group 120 is converted into the sliding movement of the third connecting member 143 when the cart 100 is folded. The linkage relationship is simple, and the cart 100 is not prone to getting stuck during the unfolding and folding process; by simplifying the connecting rods and support rods between the front leg group 120, the rear leg group 130 and the handle group 110 into smaller connecting members, the overall structure of the cart 100 is simpler, the production cost is low, and the cart 100 has a small volume and light weight after folding.

[0041] In some embodiments, the first connecting member 141 includes a first main body 141a, a first end 141b, and a second end 141c. The first main body 141a is connected between the first end 141b and the second end 141c. The first main body 141a is rotatably connected to the second connecting member 142. The first end 141b is used to connect to the handle assembly 110, and the second end 141c is used to rotatably connect to the front leg assembly 120. Specifically, referring to FIG. 2 , the first connecting member 141 includes the first main body 141a, the first end 141b, and the second end 141c. The first main body 141a is the main supporting portion of the first connecting member 141. The first main body 141a is connected between the first end 141b and the second end 141c, providing structural strength and stability for the first connecting member 141, while also receiving and transmitting rotational force between the handle assembly 110 and the front leg assembly 120. The first main body 141a is rotatably connected to the second connecting member 142. The first main body 141a and the second connecting member 142 can rotate relative to each other. In combination with the aforementioned embodiment, the connection point between the first main body 141a and the second connecting member 142 is the second rotation point 145. The first end 141b is connected to the push handle assembly 110. A corresponding connection point or interface can be provided on the first end 141b to secure the push handle assembly 110 to the first end 141b. The second end 141c is rotatably connected to the front foot assembly 120. The front foot assembly 120 is rotatable relative to the second end 141c. The connection point between the second end 141c and the front foot assembly 120 is the first rotation point 144. By fixing the push handle group 110 with the first end 141b and rotatingly connecting the front leg group 120 with the second end 141c, the rotation of the push handle group 110 can be transmitted to the front leg group 120, thereby enabling the front leg group 120 to be folded and unfolded relative to the rear leg group 130 and the push handle group 110; by rotatingly connecting the first main body 141a to the second connecting part, the push handle group 110 can be folded and unfolded relative to the rear leg group 130.

[0042] In some embodiments, the first end portion 141b extends along a first predetermined direction, and the second end portion 141c is configured to extend along the first predetermined direction and be inclined toward the second connecting member 142 in a direction away from the first main body portion 141a. Specifically, referring to FIG2 , the central axis direction of the first end portion 141b in FIG2 is the first predetermined direction. The first end portion 141b extends along the first predetermined direction and is fixedly connected to the push handle assembly 110. The second end portion 141c extends along the first predetermined direction on a side close to the first main body portion 141a, and is inclined toward the second connecting member 142 on a side away from the first main body portion 141a. The second end portion 141c is generally arc-shaped, which can provide a larger rotation range for the rotational connection between the second end portion 141c and the forefoot assembly 120, and can also disperse stress between the connection points, avoid stress concentration in specific locations, reduce pressure on the connection points, and extend the service life of the connection parts. In addition, the arc-shaped structure allows for a larger gap between the second end portion 141 c and the second connecting member 142 , facilitating the rotation between the second connecting member 142 and the third connecting member 143 , providing better rotation performance and avoiding friction interference.

[0043] In some embodiments, the second connecting member 142 includes a second main body 142a and a first branch 142b. One end of the second main body 142a is rotatably connected to the first connecting member 141, and the other end is used to connect to the rear leg assembly 130. The first branch 142b is connected to the second main body 142a and extends obliquely away from the second main body 142a and away from the one end of the second main body 142a. The first branch 142b is rotatably connected to the third connecting member 143. Specifically, referring to FIG. 2 , the second connecting member 142 includes a second main body 142a and a first branch 142b. The second main body 142a is used to connect the first connecting member 141 and the rear leg assembly 130. The connection point between the second main body 142a and the first connecting member 141 is a second rotation point 145. Through the rotational connection, the push handle assembly 110 can rotate relative to the rear leg assembly 130 about the second rotation point 145. The first branch 142b is disposed on a side of the second main body 142a near the front leg assembly 120. One end of the first branch 142b is fixedly connected to the second main body 142a, and the other end is pivotally connected to the third connecting member 143. The first branch 142b extends obliquely away from the second main body 142a and toward one end of the second main body 142a. The first branch 142b enables a rotational connection between the second connecting member 142 and the third connecting member 143, thereby driving a rotational connection between the rear leg assembly 130 and the front leg assembly 120.

[0044] In some embodiments, the third connecting member 143 includes a third main portion 143a and a second branch 143b. The third main portion 143a is configured to be slidably connected to the forefoot assembly 120. The second branch 143b is connected to the third main portion 143a and extends obliquely away from the third main portion 143a toward the second connecting member 142. The second branch 143b is rotatably connected to the second connecting member 142. Specifically, referring to FIG. 2 , the third connecting member 143 includes a third main portion 143a and a second branch 143b. The third main portion 143a is sleeved onto the connecting rod of the forefoot assembly 120 and can slide on the connecting rod of the forefoot assembly 120 relative to the forefoot assembly 120. One end of the second branch 143b is fixedly connected to the third main portion 143a and the other end is rotatably connected to the second connecting member 142. The second branch 143b extends obliquely away from the third main portion 143a toward the second connecting member 142. The rotational connection between the second branch portion 143 b and the second connecting member 142 can drive the third main body portion 143 a to slide on the front leg assembly 120 .

[0045] In some embodiments, the folding device 140 also includes a locking structure 150, which includes a plurality of first teeth 151, a plurality of second teeth 152, a third tooth 153 and a driving unit 154. The plurality of first teeth 151 are spaced apart around the rotation axis of the first connecting member 141 and the second connecting member 142, and the plurality of second teeth 152 are arranged around the rotation axis. One of the plurality of first teeth 151 and the plurality of second teeth 152 is provided on the first connecting member 141, and the other is provided on the second connecting member 142; the third tooth 153 is engaged with the second tooth 152 and is movable along the rotation axis. The third tooth 153 has a first position and a second position. In the first position, the third tooth 153 is engaged with the second tooth 152, and in the second position, the third tooth 153 is disengaged from the second tooth 152; the driving unit 154 is used to drive the third tooth 153. Specifically, referring to FIG. 4 , the folding device 140 includes a locking structure 150 , which is provided at the hinged connection between a first connecting member 141 and a second connecting member 142 . One of the first connecting member 141 and the second connecting member 142 is provided with a plurality of first teeth 151 surrounding a rotation axis, while the other is provided with a plurality of second teeth 152 surrounding the rotation axis. A third tooth 153 is driven by a driving unit 154 to move along the rotation axis. The third tooth 153 is divided into a first position and a second position according to the movement position of the third tooth 153 on the rotation axis. In the first position, the third tooth 153 engages with the second tooth 152, forming a locked state; in the second position, the third tooth 153 disengages from the second tooth 152, releasing the locked state. The driving unit 154 can be manually operated, spring-driven, or electrically driven. The plurality of first teeth 151, the plurality of second teeth 152, the third tooth 153, and the driving unit 154 achieve the locking and unlocking functions of the folding device 140 by rotating the axis and engaging and disengaging. The position and state of the third teeth 153 can be controlled by the driving unit 154 , thereby achieving the folding and unfolding operations of the cart 100 .

[0046] Another object of the present application is to provide a stroller 100 , which includes the aforementioned folding device 140 of the stroller 100 .

[0047] According to the stroller 100 in the embodiment of the present application, the stroller 100 includes any of the aforementioned folding devices 140, a handle assembly 110, a front leg assembly 120, and a rear leg assembly 130. A first connecting member 141 is relatively fixedly connected to the handle assembly 110 and rotatably connected to the front leg assembly 120. A second connecting member 142 is relatively fixedly connected to the rear leg assembly 130. A third connecting member 143 is slidably connected to the front leg assembly 120. Specifically, referring to FIG1 , the handle assembly 110 is used to push, fold, and unfold the stroller 100, and the front leg assembly 120 and the rear leg assembly 130 jointly support and stabilize the stroller 100. The handle assembly 110 is relatively fixedly connected to the first connecting member 141, which is rotatably connected to the front leg assembly 120. It is understood that the handle assembly 110 and the front leg assembly 120 can be rotatably connected via the first connecting member 141. When the handle assembly 110 is rotated, the rotational force is transmitted to the front leg assembly 120 via the first connecting member 141, and the front leg assembly 120 also rotates with the handle assembly 110. The rear leg assembly 130 is relatively fixedly connected to the second connecting member 142. The second connecting member 142 is rotatably connected to the first connecting member 141 and the third connecting member 143, respectively. It is understood that the handle assembly 110 and the rear leg assembly 130 can be rotatably connected via the second connecting member 142, and the front leg assembly 120 and the rear leg assembly 130 can be rotatably connected via the third connecting member 143. The third connecting member 143 is slidingly connected to the front leg group 120. When the cart 100 is folded or opened, as the front leg group 120 gradually approaches or moves away from the rear leg group 130 driven by the push handle group 110, the distance between the front leg group 120 and the rear leg group 130 gradually decreases or increases, and the distance between the third connecting member 143 and the second connecting member 142 also gradually decreases or increases. The second connecting member 142 gradually generates a reverse thrust or pull on the third connecting member 143. Under the action of the reverse thrust or pull, the third connecting member 143 slides along the front leg group 120 to smoothly complete the folding or opening of the cart 100.

[0048] According to the cart 100 in the embodiment of the present application, by applying the aforementioned folding device 140 of the cart 100, rotatable connections are formed between the handle group 110 and the front leg group 120, between the handle group 110 and the rear leg group 130, and between the rear leg group 130 and the front leg group 120, so that the cart 100 can be quickly folded or unfolded by pressing or lifting the handle group 110.

[0049] In some embodiments, the handle assembly 110 includes a first connecting rod 111, the rear leg assembly 130 includes a second connecting rod 131, and the front leg assembly 120 includes a third connecting rod 121. One end of the first connecting rod 111 is plugged into the first connecting member 141, the second connecting rod 131 is plugged into the second connecting member 142, one end of the third connecting rod 121 is rotatably connected to the first connecting member 141, and the third connecting member 143 is sleeved and slidably connected to the third connecting rod 121. Specifically, referring to FIG3 , the handle assembly 110, the rear leg assembly 130, and the front leg assembly 120 are respectively connected to the folding device 140 via connecting rods. The handle assembly 110 includes a first connecting rod 111, one end of which is plugged into the first connecting member 141 and the other end is connected to the handle. The first connecting rod 111 can be used to transmit thrust. When the user applies thrust to the handle, the first connecting rod 111 transmits the thrust to the vehicle body. The rear leg assembly 130 includes a second link 131, one end of which is also plugged into the second connector 142 and the other end is connected to the rear wheel, facilitating the securing of the rear wheel and maintaining the structural stability of the stroller 100. The front leg assembly 120 includes a third link 121, one end of which is pivotally connected to the first connector 141 and the other end is connected to the front wheel. A third connector 143 is sleeved onto the third link 121. Of course, the first and second links 111, 131, and 142, respectively, can also be connected using other connection methods, such as threaded connections, pin connections, or welded connections. The first, second, and third links 111, 131, and 121 work together throughout the stroller 100 system to achieve propulsion, support, and stability, while also transmitting force and motion.

[0050] In some embodiments, the stroller 100 can stand when folded. As shown in FIG8 , when the stroller 100 is folded, the front leg assembly 120 and the rear leg assembly 130 can support themselves on the ground. The first rotation point 144, the wheels of the front leg assembly 120, and the wheels of the rear leg assembly 130 can form an acute triangle. The center of gravity of the stroller 100 is located within this acute triangle, making the stroller 100 more stable and allowing it to stand supported by the front leg assembly 120 and the rear leg assembly 130. Furthermore, the acute triangle formed by the first rotation point 144, the wheels of the front leg assembly 120, and the wheels of the rear leg assembly 130 can more evenly distribute the weight of the stroller 100, preventing instability caused by excessive weight concentration at one point.

[0051] In some embodiments, the cart 100 also includes a tray assembly 160, which includes a tray 161 and a buckle 162. The tray 161 has a positioning slot 163; the buckle 162 is rotatably connected to the tray 161 and has a locked state and an unlocked state. In the locked state, the buckle 162 extends from the side wall of the positioning slot 163, and in the unlocked state, the buckle 162 exits the positioning slot 163; wherein, the folding device 140 also includes a mounting seat 164, which is provided in the positioning slot 163 and can slide out along the extension direction of the positioning slot 163, and the buckle 162 is used to unlock and lock the mounting seat 164. Specifically, referring to Figures 5 to 7 , the cart 100 may be provided with a tray assembly 160, which can be used as a dining tray, a storage tray, and the like. The tray assembly 160 includes a tray 161 and a buckle 162. The tray 161 is the main body of the tray assembly 160, and positioning grooves 163 are provided on both sides of the tray 161. The positioning grooves 163 are used to position and install the tray 161. The buckle 162 is rotatably connected to the tray 161 and can be divided into a locked state and an unlocked state according to the position of the buckle 162 after rotation. When the buckle 162 is in the locked state, the buckle 162 extends into the side wall of the positioning groove 163; when the buckle 162 is in the unlocked state, the buckle 162 exits the positioning groove 163. The folding device 140 includes a mounting seat 164, which is adapted to the positioning slot 163 of the tray 161. The mounting seat 164 can be installed in the positioning slot 163 and can slide out along the extension direction of the positioning slot 163. When the buckle 162 is buckled into the positioning slot 163, the buckle 162 locks the mounting seat 164 to ensure a stable connection between the mounting seat 164 and the tray 161; when the buckle 162 exits the positioning slot 163, the buckle 162 unlocks the mounting seat 164, so that the tray 161 can be freely moved or disassembled.

[0052] In some embodiments, the mounting base 164 is provided with a positioning slot 165. The buckle 162 engages in the positioning slot 165 when locked and exits the positioning slot 165 when unlocked. Specifically, referring to FIG7 , the mounting base 164 is provided with a positioning slot 165 on a sidewall near the buckle 162 to facilitate insertion and removal of the buckle 162. When the buckle 162 is engaged with the positioning slot 165, the buckle 162 and the mounting base 164 are locked and fixed in the positioning slot 165. The buckle 162 and the mounting base 164 maintain a stable connection, and the tray 161 is mounted on the folding device 140 of the cart 100. When the buckle 162 exits the positioning slot 165, the buckle 162 and the mounting base 164 are unlocked, and the buckle 162 can be freely moved, rotated, or removed, allowing the tray 161 to be removed from the cart 100.

[0053] In some embodiments, one end of the positioning slot 163 has an opening for the mounting seat 164 to slide in and out. When locked, the side of the latch 162 near the opening is configured as a wedge-shaped slope, which is used to push the latch 162 to the unlocked state when the mounting seat 164 slides into the positioning slot 163. Specifically, one end of the positioning slot 163 has an opening that serves as a passageway for the mounting seat 164, along which the mounting seat 164 can slide into and out of the positioning slot 163. When the latch 162 is in the locked state, the side near the opening is configured as a wedge-shaped slope. When the mounting seat 164 slides into the positioning slot 163, the wedge-shaped slope pushes the latch 162 outward, causing it to enter the unlocked state, facilitating the installation of the mounting seat 164 with the tray 161.

[0054] In some embodiments, the tray assembly 160 further includes a reset member 166, which has an elastic force that drives the buckle 162 to an unlocked state. Specifically, referring to FIG7 , the tray assembly 160 further includes a reset member 166, one end of which abuts the tray 161 and the other end of which abuts the buckle 162. The reset member 166 is typically made of an elastic material, such as a spring or rubber. When a certain pressing force is applied to the buckle 162, the buckle 162 transmits the pressure to the reset member 166, which is compressed and drives the buckle 162 out of the positioning slot 165. At this time, the buckle 162 and the mounting base 164 are in an unlocked state, thereby enabling the tray assembly 160 to be disassembled or moved.

[0055] In some embodiments, stroller 100 further includes a canopy assembly 170, which is removably mounted on stroller 100. Referring to Figures 3 and 6 , canopy assembly 170 can be used to provide sunshade, rain protection, and other functions. By removing or attaching canopy assembly 170, the user can choose whether to use the canopy when using stroller 100, depending on the environment and needs, thereby increasing the adaptability and functionality of stroller 100. For example, in strong sunlight, the user can install canopy assembly 170 to provide sun protection; on rainy days or when protecting infants and young children from inclement weather, the user can install canopy assembly 170 to provide rain protection and other protective functions.

[0056] In some embodiments, the cart 100 also includes a cola holder that is removably mounted on the cart 100. The cola holder can securely hold a beverage cup, water bottle, or other beverage container. With the cola holder, users can conveniently place their beverages in the holder while using the cart 100, allowing them to enjoy their drinks at any time without the need for additional handholds or other surfaces. This arrangement increases the convenience and practicality of the cart 100, allowing users to conveniently enjoy their beverages while pushing the cart.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0058] The above description is merely a specific embodiment of the present application. It should be understood that the above embodiments are illustrative and should not be construed as limiting the present application. The scope of protection of the present application is not limited thereto. Any equivalent structural transformation or replacement made using the contents of the present application specification and drawings, or direct or indirect application in other related technical fields, within the scope of the present application, is included in the scope of patent protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A folding device (140) for a cart (100), wherein the cart (100) comprises a handle assembly (110), a front leg assembly (120), and a rear leg assembly (130), characterized in that: The folding device (140) comprises: A first connecting member (141), the first connecting member (141) is used to relatively fixedly connect to the push handle assembly (110) and rotatably connect to the front foot assembly (120); a second connecting member (142), the second connecting member (142) being rotatably connected to the first connecting member (141) and used for relatively fixedly connecting the rear leg group (130); A third connecting member (143) is rotatably connected to the second connecting member (142) and is used for sliding connection to the front foot group (120), wherein the first connecting member (141), the second connecting member (142) and the third connecting member (143) constitute a connecting rod slider mechanism.

2. The folding device (140) according to claim 1, characterized in that The first connecting member (141) has a first main body (141a), a first end (141b) and a second end (141c), the first main body (141a) is connected between the first end (141b) and the second end (141c), the first main body (141a) is rotatably connected to the second connecting member (142), the first end (141b) is used to connect to the push handle group (110), and the second end (141c) is used to rotatably connect to the front foot group (120).

3. The folding device (140) according to claim 2, characterized in that The first end portion (141b) extends along a first predetermined direction, and the second end portion (141c) is configured to extend along the first predetermined direction and to be in an arc shape inclined toward the second connecting member (142) in a direction away from the first main body portion (141a).

4. The folding device (140) according to claim 1, characterized in that The second connecting member (142) includes a second main body (142a) and a first branch (142b), one end of the second main body (142a) is rotatably connected to the first connecting member (141), and the other end is used to connect to the rear foot group (130), the first branch (142b) is connected to the second main body (142a), and extends obliquely in a direction away from the second main body (142a) toward the direction away from the one end of the second main body (142a), and the first branch (142b) is rotatably connected to the third connecting member (143).

5. The folding device (140) according to claim 1 or 4, characterized in that: The third connecting member (143) includes a third main body (143a) and a second branch (143b), wherein the third main body (143a) is used for sliding connection with the front foot group (120), the second branch (143b) is connected to the third main body (143a) and extends obliquely from the direction away from the third main body (143a) toward the direction close to the first connecting member (141), and the second branch (143b) is rotatably connected to the second connecting member (142).

6. The folding device (140) according to any one of claims 1 to 4, characterized in that: The folding device (140) further includes a locking structure (150), wherein the locking structure (150) includes: a plurality of first teeth (151), the plurality of first teeth (151) being spaced and distributed around the rotation axis of the first connecting member (141) and the second connecting member (142); a plurality of second teeth (152), the plurality of second teeth (152) surrounding the rotation axis, one of the plurality of first teeth (151) and the plurality of second teeth (152) being provided on the first connecting member (141), and the other being provided on the second connecting member (142); a third tooth (153), the third tooth (153) being meshed with the second tooth (152) and movable along the rotation axis, the third tooth (153) having a first position and a second position, wherein the third tooth (153) is meshed with the second tooth (152) in the first position, and the third tooth (153) is out of meshing with the second tooth (152) in the second position; A driving portion (154) is used to drive the third tooth (153).

7. A cart (100), characterized in that: include: A push handle assembly (110), a front foot assembly (120), and a rear foot assembly (130); According to the folding device (140) described in any one of claims 1 to 6, the first connecting member (141) is relatively fixedly connected to the handle group (110) and rotatably connected to the front foot group (120); the second connecting member (142) is relatively fixedly connected to the rear foot group (130); and the third connecting member (143) is slidably connected to the front foot group (120).

8. The cart (100) according to claim 7, characterized in that The push handle group (110) includes a first connecting rod (111), the rear foot group (130) includes a second connecting rod (131), and the front foot group (120) includes a third connecting rod (121). One end of the first connecting rod (111) is plugged into the first connecting member (141), and the second connecting rod (131) is plugged into the second connecting member (142). One end of the third connecting rod (121) is rotatably connected to the first connecting member (141), and the third connecting member (143) is sleeved and slidably connected to the third connecting rod (121).

9. The cart (100) according to claim 7, characterized in that The cart (100) further includes a tray assembly (160), the tray assembly (160) including: A tray (161), wherein the tray (161) has a positioning slot (163); A buckle (162), the buckle (162) is rotatably connected to the tray (161) and has a locked state and an unlocked state. In the locked state, the buckle (162) extends from the side wall of the positioning slot (163), and in the unlocked state, the buckle (162) exits the positioning slot (163); The folding device (140) further comprises a mounting seat (164), wherein the mounting seat (164) is arranged in the positioning slide groove (163) and can slide out along the extension direction of the positioning slide groove (163), and the buckle (162) is used to unlock and lock the mounting seat (164).

10. The cart (100) according to claim 9, characterized in that A positioning slot (165) is provided on the mounting seat (164); the buckle (162) is embedded in the positioning slot (165) in the locked state and exits the positioning slot (165) in the unlocked state; Alternatively, one end of the positioning slot (163) has an opening for the mounting seat (164) to slide in and out, and the side of the buckle (162) close to the opening in the locked state is configured as a wedge-shaped inclined surface for pushing the buckle (162) to the unlocked state when the mounting seat (164) slides into the positioning slot (163); Alternatively, the tray assembly (160) further includes a reset member (166), and the reset member (166) has an elastic force that drives the buckle (162) to the unlocked state.

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