Folding cart

Abstract

A frame unit on the left side and the right side of a folding frame of the folding cart comprises a front arm and a rear arm which are hinged to each other, a movable seat on the rear arm is further provided with an up-down movable position locking device, a connecting rod is hinged between the movable seat and the front arm, a fixed seat is arranged on the rear arm, and a first connecting rod is hinged between the fixed seat on the left side and the movable seat on the right side. A second connecting rod is hinged between the fixing base on the right side and the fixing base on the left side, and the first connecting rod and the second connecting rod are hinged in the middle. A linkage folding structure is arranged between a left frame unit and a right frame unit in a folding frame, when a movable seat moves up and down, a front arm can be rotatably folded (unfolded or folded) relative to a rear arm, the left frame unit and the right frame unit can also be mutually closed up or separated, and the front arm and the rear arm are supported by a connecting rod in a matched mode when the front arm is unfolded in place. The left and right frame units are cooperatively supported by a first connecting rod and a second connecting rod; linkage folding can be achieved, folding operation is convenient, unfolding and folding are convenient, and the supporting structure is stable after unfolding.

Description

Technical Field

[0001] The utility model relates to a cart. Background Art

[0002] There are many types of strollers, among which folding strollers are particularly convenient and easy to use, as they can be folded for transport and storage. However, these strollers have complex folding structures and are cumbersome to fold. With such complex folding structures and cumbersome operation, the strollers' functions are relatively simple, and their use scenarios are limited, lacking in variety. Utility Model Content

[0003] In view of the technical problems existing in the background technology, the present invention aims to provide a folding cart with a linked folding structure that is easy to operate.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a folding cart, comprising a folding frame, the folding frame comprising a left-side and a right-side frame unit, the frame unit comprising a forearm and a rear arm, characterized in that: the forearm is hinged to the rear arm, a movable seat is provided on the rear arm, the movable seat is also equipped with an upper and lower movable position locking device, a connecting rod is hinged between the movable seat and the forearm, a fixed seat is also provided on the rear arm, a first connecting rod is hinged between the fixed seat on the left and the movable seat on the right, a second connecting rod is hinged between the fixed seat on the right and the movable seat on the left, and the first connecting rod and the second connecting rod are hinged in the middle.

[0005] The following various optimizations or supplementary explanations can be made on the above technical solutions respectively.

[0006] The movable seat is movably sleeved on the rear arm, the rear arm has a straight portion, and the movable seat is slidably sleeved outside the straight portion.

[0007] Both the forearm and the hind arm adopt a hollow rod structure.

[0008] The front wheel device is provided at the lower end of the front arm, the rear wheel device is provided at the lower end of the rear arm, a brake component for braking the rear wheel device is provided on the rear arm, and a handle is provided on the front arm; a brake handle is provided on the handle, and the brake handle is connected to the brake component.

[0009] It can also be optimized, where the handle is provided on the telescopic rod, the handle is located at the upper end of the telescopic rod, the telescopic rod is connected to the forearm sleeve, and the telescopic rod is also equipped with a telescopic position adjustment locking device.

[0010] Further optimization, the rear arm is also connected to a support avoidance rod, the braking component is arranged on the support avoidance rod, the upper end of the support avoidance rod is connected to the front arm, the lower end of the support avoidance rod is connected to the front arm, and the movable seat and the fixed seat are located on the rear arm between the upper end and the lower end of the support avoidance rod.

[0011] In addition, it can be designed that a detachable deployment limit support rod is provided between the left and right frame units, the left and right ends of the deployment limit support rod are respectively provided with a limit support part, and the front arm or rear arm of the frame unit is provided with a mounting part for detachable connection of the end of the deployment limit support rod.

[0012] For example, the mounting portion includes a receiving interface for the end portion of the unfolded limit support rod to be placed downwardly, a limit annular groove is provided on the limit support portion, and a limit protrusion is also provided in the receiving interface, and the limit protrusion corresponds to the limit annular groove.

[0013] Furthermore, the mounting portion is located on the forearm, and a storage component is suspended from the deployment limit support rod, located in front of the first and second connecting rods. There's even a detachable crossbar between the left and right mounting brackets. A seat component is mounted on the crossbar and the deployment limit support rod, and a backrest component is located in front of the seat component, which is connected to the frame unit.

[0014] As an additional optimization, the backrest utilizes a belt. The left end of the backrest is connected to the left forearm, and the right end is connected to the right forearm. To achieve a more compact design, a hinged seat is provided at the upper end of the forearm, and a hinge shaft is provided at the rear of the seat. The forearm and rear arm are connected via the hinge shaft. A connecting rod is located below the hinge shaft. The front side of the hinged seat is connected to the backrest. The hinged seat has a through hole, and the forearm is connected to the telescopic rod with a handle through the through hole of the hinged seat. The hinged seat is also provided with a connection portion for the belt to connect.

[0015] Alternatively, a deployment limiter drawstring may be provided between the left and right frame units.

[0016] The beneficial effects of the present invention are as follows: in the folding stroller, the left and right frame units in the folding frame thereof are in a linkage folding structure; when the movable seat moves up and down relatively on the rear arm, the front arm can be rotated and folded relative to the rear arm (can be unfolded or folded); the left and right frame units can also be brought closer to or separated from each other (can be unfolded or folded); and in the unfolded state (wherein the movable seat is in a locked and fixed state), the front arm and the rear arm are supported by a connecting rod, and the left and right frame units are supported by a first connecting rod and a second connecting rod; in the entire folding frame structure, the movable seat is in a linkage state during operation and can be folded in a linkage manner; the folding operation is convenient, the unfolding and folding are convenient, and the supporting structure is stable after unfolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following describes the relevant details and working principles of the implementation methods and embodiments of the present invention in conjunction with the accompanying drawings.

[0018] Figure 1 Schematic diagram of the three-dimensional structure of the folding frame of the folding cart in the embodiment, in the unfolded state.

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the folding cart from the perspective.

[0020] Figure 3 for Figure 1 Schematic diagram of the structure from another angle.

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the folding cart from the perspective.

[0022] Figure 5 for Figure 3 Schematic diagram after assembling the support avoidance rod and cross bar.

[0023] Figure 6 for Figure 1 Folded and collapsed state diagram.

[0024] Figure 7 for Figure 6 Schematic diagram of the structure from another angle.

[0025] In the picture:

[0026] 1. Folding frame; 10. Frame unit; 11. Front arm; 12. Rear arm; 13. Movable seat; 14. Connecting rod; 15. First connecting rod; 16. Second connecting rod; 17. Fixed seat;

[0027] 111. Telescopic rod;

[0028] 121. Support avoidance rod;

[0029] 171, place the mouth;

[0030] 131. Up and down movable position locking device; 1111. Telescopic position adjustment locking device;

[0031] 2. Handle; 20. Brake handle; 21. Braking parts;

[0032] 3. Expand the limit support rod; 30. Limit annular groove;

[0033] 4. Mounting portion; 40. Socket interface; 41. Limiting protrusion;

[0034] 5. Storage components;

[0035] 6. horizontal bar;

[0036] 7. Seat components;

[0037] 8. Backrest components;

[0038] 9. Articulated seat; 90. Articulated shaft. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the implementation of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] Referring to the accompanying drawings, a folding stroller in an embodiment of the present embodiment includes a folding frame 1, which includes a left frame unit 10 and a right frame unit 10. That is, the folding structure of the folding frame 1 is mainly composed of the left frame unit 10 and the right frame unit 10.

[0041] The frame unit 10 includes a front arm 11 and a rear arm 12. In the frame unit 10, the front arm 11 and the rear arm 12 are hinged and can be relatively rotated and folded. A movable seat 13 is provided on the rear arm 12. The movable seat 13 is also provided with an up and down movable position locking device 131. The up and down movable position locking device 131 locks the position of the movable seat 13. After locking, the position of the movable seat 13 on the rear arm 12 is in a locked and fixed state. After unlocking, the movable seat 13 can move up and down on the rear arm 12. A connecting rod 14 is hinged between the movable seat 13 and the front arm 11. When the movable seat 13 moves up and down on the rear arm 12, the connecting rod 14 is linked to make the front arm 11 rotate and fold relative to the rear arm 12 (can be unfolded or retracted), and when it is unfolded in place (wherein the movable seat 13 is in a locked and fixed state), it is supported by the connecting rod 14 on the front arm 11 and the rear arm. 12, the connecting rod 14 forms a stable structure (triangular structure) with the hinged position of the front arm 11 and the rear arm 12; in addition, a fixed seat 17 is also provided on the rear arm 12, wherein a first connecting rod 15 is hinged between the fixed seat 17 on the left and the movable seat 13 on the right, and a second connecting rod 16 is hinged between the fixed seat 17 on the right and the movable seat 13 on the left. The first connecting rod 15 and the second connecting rod 16 are hinged in the middle to form a left and right folding structure. When the movable seat 13 moves up and down on the rear arm 12, the first connecting rod 15 and the first connecting rod 15 are linked to make the left and right frame units 10 move closer to or apart from each other (can be unfolded or folded), and when in the unfolded state (wherein the movable seat 13 is in a locked and fixed state), it is supported between the left and right frame units 10 by the cross-arranged first connecting rod 15 and the second connecting rod 16.

[0042] In the folding stroller, the left and right frame units 10 in the folding frame 1 are in a linked folding structure. When the movable seat 13 moves up and down relatively on the rear arm 12, the front arm 11 can be rotated and folded relative to the rear arm 12 (can be unfolded or folded), and the left and right frame units 10 can also move closer to or apart from each other (can be unfolded or folded). In the unfolded state (wherein the movable seat 13 is in a locked and fixed state), the front arm 11 and the rear arm 12 are supported by the connecting rod 14, and the left and right frame units 10 are supported by the first connecting rod 15 and the second connecting rod 16. In the entire folding frame 1 structure, the movable seat 13 is in a linked state during operation, the folding operation is convenient, the unfolding and folding are convenient, and the support structure is stable after unfolding.

[0043] The following optimization or further explanation may be performed based on the above embodiments.

[0044] For example, the movable seat 13 is movably mounted on the rear arm 12. The movable seat 13 is mounted on the rear arm 12 for operation. The rear arm 12 has a straight portion, and the movable seat 13 is slidably mounted outside the straight portion, ensuring stable operation. Both the front arm 11 and the rear arm 12 can be hollow rod-shaped structures for portability. On the rear arm 12, the movable seat 13 is located below the fixed seat 17.

[0045] Among them, the lower end of the front arm 11 is provided with a front wheel device, and the lower end of the rear arm 12 is provided with a rear wheel device. The structures of the front wheel device and the rear wheel device are numerous and mature. For example, the structure in equipment such as wheelchairs can be adopted, and universal wheels or fixed wheels or a combination thereof can be adopted; in addition, a braking component 21 (such as containing brake blocks) for braking the rear wheel device is provided on the rear arm 12, and a handle 2 is also provided on the forearm 11 so that the user can hold and push the cart to move; a brake handle 20 is provided on the handle 2, and the brake handle 20 is connected to the brake component 21 and can be connected by a cable or the like. The brake handle 20 can cooperate to control the operation of the brake component 21, which is a mature technology. For example, the brake structure in equipment such as wheelchairs and bicycles (including the brake handle 20, the brake component 21 and their matching connection, etc.) can be adopted.

[0046] In addition, a telescopic rod 111 is provided on the forearm 11, and a handle 2 is mounted on the telescopic rod 111. The telescopic rod 111 can be extended and retracted on the forearm 11, and the height of the handle 2 can be adjusted for ease of use or folding. The handle 2 is located at the upper end of the telescopic rod 111. The telescopic rod 111 is telescopically connected to the forearm 11 to form a telescopic structure. The telescopic rod 111 is also equipped with a telescopic position adjustment locking device 1111, which locks the telescopic rod 111 in its adjusted position.

[0047] The vertically movable position locking device 131 has a variety of structural options and is relatively mature; for example, it uses a fastener locking structure or a pinned locking structure, such as a spring-return pull-ring indexing pin or knob plunger installed on the movable seat 13, and a position pin hole 23 is provided on the rear arm 12. Similarly, the telescopic position adjustment locking device 1111 has a variety of structural options and is relatively mature; for example, it also uses a fastener locking structure or a pinned locking structure, such as a button-type pin structure that is pinned to the pin hole 22 on the telescopic rod 111.

[0048] In addition, a support avoidance rod 121 is also connected to the rear arm 12, and the brake component 21 can be set on the support avoidance rod 121 connected to the rear arm 12, the upper end of the support avoidance rod 121 is connected to the front arm 11, and the lower end of the support avoidance rod 121 is connected to the front arm 11. The movable seat 13 and the fixed seat 17 are located on the rear arm 12 between the upper and lower ends of the support avoidance rod 121. The upper and lower ends of the support avoidance rod 121 can be bent and connected to the rear arm 12, which helps to maximize folding (making the volume relatively smaller after folding and folding), so that the movable seat 13 can be fully moved into place on the rear arm 12 when the folding frame 1 is folded and folded, avoiding the brake component 21 interfering with its movement, and the support avoidance rod 121 can additionally support the rear arm 12, which has better strength and makes the entire folding frame 1 structure more solid.

[0049] The folding cart has a folding frame 1 and can be further optimized. When the left frame unit 10 and the right frame unit 10 are separately unfolded, an unfolding limit structure can be provided to ensure that the structure is in a stable state when it is unfolded into place. For example, a deployment limit rope (not shown in the figure) is provided between the left and right frame units 10, and the deployment limit rope is pulled to limit the distance that the frame units 10 are deployed to the left and right sides. For another example, a detachable deployment limit support rod 3 is provided between the left and right frame units 10, and the left and right ends of the deployment limit support rod 3 are respectively provided with a limit support part, and the front arm 11 or the rear arm 12 of the frame unit 10 is provided with a mounting part 4 for detachable connection of the end part of the deployment limit support rod 3. After the left and right frame units 10 are separated from each other and deployed into place, the deployment limit support rod 3 is installed, wherein the limit support parts at the left and right ends of the deployment limit support rod 3 are respectively installed in the mounting part 4 of the frame unit 10 (the front arm 11 or the rear arm 12), so that the structure is in a stable limited state when it is deployed into place, and is not easy to shake or loosen, and the load-bearing capacity of the folding frame 1 is better. For example, the mounting portion 4 includes a receiving interface 40 for the end portion of the expansion limit support rod 3 to be inserted downwardly, and the receiving interface 40 is opened upward to facilitate the end portion of the expansion limit support rod 3 to be inserted downwardly therein for assembly; for another example, a limiting annular groove 30 is provided on the limiting support portion, and a limiting protrusion 41 is also provided in the receiving interface 40, and the limiting protrusion 41 corresponds to the limiting annular groove 30. When the end portion of the expansion limit support rod 3 is assembled into the receiving interface 40 of the mounting portion 4, the limiting protrusion 41 and the limiting annular groove 30 can correspond to the limiting cooperation (insertion limiting cooperation). When the left and right frame units 10 are expanded into place, the structure is in a stable limited state. Moreover, the expansion limit support rod 3 in this structure is easy to assemble and disassemble. When it is expanded into place, it only needs to be inserted downward into the receiving interface 40 to complete the assembly. When disassembling, the expansion limit support rod 3 can be taken out upward.

[0050] In addition, the mounting portion 4 can be set on the forearm 11, and a storage component 5 (such as a storage bag, a storage box, a shopping bag, etc.) is hung on the unfolding limit support rod 3. The storage component 5 is located in front of the first connecting rod 15 and the second connecting rod 16. The structural layout is reasonable and fully utilizes the space when folding and unfolding; in addition, a detachable cross bar 6 is provided between the fixed seats 17 on the left and right sides, and a seat component 7 (such as a seat plate, etc.) is provided on the cross bar 6 and the unfolding limit support rod 3. The cross bar 6 can not only enhance the structural strength of the folding frame 1 after unfolding, but also can be used to cooperate with the support seat component 7 for sitting and resting. The stroller can be used for walking assistance or as a place to sit and rest. The crossbar 6 and the fixed seat 17 can be connected and disassembled using fasteners. Alternatively, the fixed seat 17 can be provided with a placement opening 171, so that the end of the crossbar 6 can be inserted from the top down into the installation opening and supported by the fixed seat 17. It can then be removed by moving it upwards, making assembly and disassembly relatively convenient. Furthermore, a backrest 8 is provided on the front side of the seat 7, and the rear side is where the handle 2 is located, which is used for manually pushing the vehicle. When sitting down, one can directly sit on the seat 7 from the rear side of the vehicle and lean against the backrest 8, without even having to move to the front side of the vehicle. The backrest 8 is connected to the frame unit 10, and the seat 7 can even be connected to the crossbar 6 and the expansion limit support rod 3 together for disassembly and assembly on the folding frame 1. The backrest component 8 is constructed with a support belt, which facilitates expansion and contraction during the folding of the left and right frame units 10, without requiring disassembly of the backrest component 8. The left end of the backrest component 8 is connected to the left forearm 11, and the right end of the backrest component 8 is connected to the right forearm 11. A hinge seat 9 (which can be made of plastic for integral molding and to facilitate smooth sliding and mating of a telescopic rod 111) can be provided at the upper end of the forearm 11. A hinge shaft 90 is provided at the rear side of the hinge seat 9. The forearm 11 and the rear arm 12 are connected via the hinge shaft 90. A connecting rod 14 is located below the hinge shaft 90. The front side of the hinge seat 9 is connected to the backrest component 8. The hinge seat 9 has a through hole, and the forearm 11 is mated to the telescopic rod 111 with the handle 2 through the through hole in the hinge seat 9. The hinge seat 9 is provided with a connecting portion for connecting the support belt, so that the support belt and the hinge seat 9 can be connected, such as by fastening or plugging. The hinge seat 9 has multiple functions and a compact structure.

Claims

1. A folding stroller, comprising a folding frame (1), the folding frame (1) comprising a left frame unit and a right frame unit (10), the frame unit (10) comprising a front arm (11) and a rear arm (12), characterized in that: The front arm (11) is hinged to the rear arm (12). A movable seat (13) is provided on the rear arm (12), and the movable seat (13) is also provided with an upper and lower movable position locking device (131). A connecting rod (14) is hinged between the movable seat (13) and the forearm (11). A fixing seat (17) is also provided on the rear arm (12). A first connecting rod (15) is hinged between the fixed seat (17) on the left and the movable seat (13) on the right. A second connecting rod (16) is hinged between the fixed seat (17) on the right and the movable seat (13) on the left. The first connecting rod (15) and the second connecting rod (16) are hinged at the middle.

2. A folding stroller according to claim 1, characterized in that: The movable seat (13) is movably sleeved on the rear arm (12), the rear arm (12) has a straight portion, and the movable seat (13) is slidably sleeved outside the straight portion; The front arm (11) and the rear arm (12) both adopt a hollow rod structure; on the rear arm (12), the movable seat (13) is located below the fixed seat (17).

3. A folding stroller according to claim 1, characterized in that: The lower end of the front arm (11) is provided with a front wheel device, and the lower end of the rear arm (12) is provided with a rear wheel device; A brake component (21) for braking the rear wheel device is provided on the rear arm (12), and a handle (2) is also provided on the front arm (11); a brake handle (20) is provided on the handle (2), and the brake handle (20) is cooperatively connected to the brake component (21).

4. A folding stroller according to claim 3, characterized in that: A telescopic rod (111) is provided on the forearm (11), a handle (2) is provided on the telescopic rod (111), the handle (2) is located at the upper end of the telescopic rod (111), the telescopic rod (111) is sleeve-connected to the forearm (11), and the telescopic rod (111) is also provided with a telescopic position adjustment locking device (1111).

5. A folding stroller according to claim 3, characterized in that: The rear arm (12) is also connected to a support avoidance rod (121), a brake component (21) is arranged on the support avoidance rod (121), an upper end of the support avoidance rod (121) is connected to the front arm (11), and a lower end of the support avoidance rod (121) is connected to the front arm (11), and a movable seat (13) and a fixed seat (17) are located on the rear arm (12) between the upper end and the lower end of the support avoidance rod (121).

6. The folding stroller according to claim 1, wherein: A detachable expansion limit support rod (3) is provided between the left and right frame units (10), and a limit support portion is provided at the left and right ends of the expansion limit support rod (3), respectively. A mounting portion (4) for detachably connecting the end of the expansion limit support rod (3) is provided on the front arm (11) or the rear arm (12) of the frame unit (10).

7. A folding stroller according to claim 6, characterized in that: The mounting portion (4) includes a receiving interface (40) for the end portion of the expansion limit support rod (3) to be inserted downwardly into, a limit annular groove (30) is provided on the limit support portion, and a limit protrusion (41) is further provided in the receiving interface (40), and the limit protrusion (41) corresponds to and matches the limit annular groove (30).

8. The foldable stroller according to claim 6, wherein: The mounting portion (4) is arranged on the forearm (11), and a storage component (5) is also suspended on the expansion limit support rod (3), and the storage component (5) is located in front of the first connecting rod (15) and the second connecting rod (16); A detachable crossbar (6) is provided between the left and right fixing seats (17). A seat component (7) is provided on the cross bar (6) and the expansion limit support rod (3), a backrest component (8) is provided on the front side of the seat component (7), and the backrest component (8) is connected to the frame unit (10).

9. A folding stroller according to claim 8, characterized in that: The backrest component (8) adopts a backrest belt, the left end of the backrest component (8) is connected to the left forearm (11), and the right end of the backrest component (8) is connected to the right forearm (11); The upper end of the forearm (11) is provided with a hinge seat (9), the rear side of the hinge seat (9) is provided with a hinge shaft (90), the forearm (11) and the rear arm (12) are connected through the hinge shaft (90), the connecting rod (14) is located below the hinge shaft (90), the front side of the hinge seat (9) is connected to the backrest component (8), the hinge seat (9) has a through hole, the forearm (11) is matched with the telescopic rod (111) with the handle (2) through the through hole on the hinge seat (9), and the hinge seat (9) is provided with a connecting portion for connecting the backrest belt.

10. The folding stroller according to claim 1, wherein: A deployment limit rope is provided between the left and right frame units (10).

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