Trolley

Abstract

The utility model belongs to the technical field of children products, and particularly discloses a cart. According to the cart, the push rod assembly is used for a user to push the cart, the first linkage piece is arranged between the first wheel assembly and the second wheel assembly, and the second linkage piece is arranged between the push rod assembly and one of the first wheel assembly and the second wheel assembly. One of the first wheel assembly and the second wheel assembly can be driven to steer through the second linkage piece, the first linkage piece is driven to enable the other one of the first wheel assembly and the second wheel assembly to steer synchronously, synchronous rotation of the first wheel assembly and the second wheel assembly is achieved, and the cart is smoother in the steering process; and after one wheel assembly is steered, additional force is not needed to enable the other wheel assembly to steer, so that the experience feeling of a user is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to children's articles technical field especially relates to a cart. BACKGROUND

[0002] The children's cart provides great convenience for adults to carry smaller children to go outdoor activities, so the children's cart gradually becomes a necessity for adults to carry children to go outdoor activities. The children's cart usually has a frame, a front wheel assembly, a rear wheel assembly, a seat and a push rod on the frame, the child sits on the seat, and the parent controls the cart to walk by pushing the push rod. In the process of pushing the cart, if the parent needs to adjust the walking direction of the cart, the direction of the front wheel assembly needs to be adjusted. In the prior art, the direction of the front wheel assembly can be adjusted by rotating the push rod, but the rear wheel assembly cannot be turned synchronously with the front wheel assembly, and there is a jam in the process of turning the cart, which causes the problem of unsmooth turning of the cart, and the turning of the cart is inconvenient. SUMMARY

[0003] The utility model discloses a cart, solve the prior art in the process of pushing the cart turning, there is a jam, cause the problem of unsmooth turning of the cart.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] A cart, including frame, the frame is movably provided with push rod assembly, one end of the frame is provided with first wheel assembly, the other end is provided with second wheel assembly, first connecting piece is arranged between the first wheel assembly and the second wheel assembly, second connecting piece is arranged between the push rod assembly and one of the first wheel assembly and the second wheel assembly, when the push rod assembly moves, one of the first wheel assembly and the second wheel assembly can be driven to turn by the second connecting piece, the first connecting piece is driven to make the other of the first wheel assembly and the second wheel assembly turn synchronously.

[0006] As an optional technical scheme of the above-mentioned cart, the second connecting piece includes a support, the first end of the support is in transmission connection with the first wheel assembly or the second wheel assembly, and the second end of the support is connected with the push rod assembly.

[0007] As an optional technical scheme of the above-mentioned cart, a gear shaft is rotatably arranged on the first wheel assembly or the second wheel assembly, the first end of the support is movably connected with the gear shaft, the gear shaft is connected with a gear, the gear is in transmission connection with the first wheel assembly or the second wheel assembly, and when the push rod assembly moves, the first wheel assembly or the second wheel assembly is driven to turn by the support.

[0008] As an optional technical scheme of the above-mentioned stroller, the first end of the support member is in transmission connection with the first wheel assembly;

[0009] The first wheel assembly comprises two first wheels, a first linkage rod is arranged between the two first wheels, two ends of the first linkage rod are respectively in rotational connection with the two first wheels, transmission teeth are arranged on the first linkage rod along the extending direction of the first linkage rod, the gear is in meshing connection with the transmission teeth, and the first linkage member is connected with the first linkage rod or the gear; and / or,

[0010] The first end of the support member is in transmission connection with the first wheel assembly at one end of the frame and extends towards the other end of the frame, and the second end of the support member is connected with the push rod assembly at the other end of the frame.

[0011] As an optional technical scheme of the above-mentioned stroller, the support member can swing in the first direction relative to the frame to drive the first wheel assembly or the second wheel assembly to steer;

[0012] A support sleeve is arranged on the frame, the first wheel assembly or the second wheel assembly, the first end of the support member passes through the support sleeve and is in movable connection with the gear shaft, and the support member can swing in the first direction relative to the support sleeve.

[0013] As an optional technical scheme of the above-mentioned stroller, the frame can be folded, one end of the frame is rotationally connected to the first wheel assembly or the second wheel assembly about a first shaft, and when the frame is folded, the frame rotates about the first shaft to approach the support member.

[0014] As an optional technical scheme of the above-mentioned stroller, a first support sleeve is fixedly arranged on the first wheel assembly, the first end of the support member passes through the first support sleeve and is in transmission connection with the first wheel assembly, and when the frame is folded, the frame moves upwards about the first shaft to approach the support member;

[0015] The frame comprises a base frame and a connecting assembly, one end of the base frame is rotationally connected to the first wheel assembly about a first shaft, the connecting assembly is connected to the other end of the base frame, the connecting assembly can be folded, and when the connecting assembly is folded, the base frame is driven to rotate about the first shaft to approach the support member;

[0016] A second support sleeve that rotates about a second shaft is arranged on the connecting assembly, the second end of the support member passes through the second support sleeve and is connected with the push rod assembly, and when the frame is folded, the connecting assembly is folded and rotates about the second shaft relative to the support member, thereby driving the frame to move upwards about the first shaft to approach the support member.

[0017] As an optional technical scheme of the above-mentioned stroller, the connecting assembly comprises a connecting rod and a damping assembly, one end of the damping assembly is rotationally connected with the chassis, the other end is rotationally connected with the connecting rod, the second support sleeve is rotationally connected with the connecting rod, and the connecting rod and the damping assembly are close to each other when the connecting assembly is folded.

[0018] The opposite sides of the chassis are respectively provided with holding members, one end of each holding member is rotationally connected with the chassis, a cross bar is arranged between each holding member and the corresponding connecting rod, one end of the cross bar is rotationally connected with the corresponding holding member, and the other end of the cross bar, the connecting rod and the damping assembly are rotationally connected at a point, and the holding members and the cross bars are close to each other when the stroller is folded.

[0019] The push rod assembly is movably connected with the support member, and the push rod assembly can be folded relative to the support member.

[0020] As an optional technical scheme of the above-mentioned stroller, the second wheel assembly comprises two second wheels, the first linkage member comprises a second linkage rod arranged between the two second wheels, both ends of the second linkage rod are rotationally connected with the two second wheels, respectively, a third linkage rod is arranged between the second linkage rod and the first linkage rod, and both ends of the third linkage rod are rotationally connected with the first linkage rod and the second linkage rod, respectively.

[0021] As an optional technical scheme of the above-mentioned stroller, the stroller further comprises a seat frame arranged on the support member.

[0022] The seat frame comprises a seat plate and a backrest, and the backrest is arranged at an angle with the seat plate.

[0023] The support member extends obliquely from one end of the frame to the upper rear of the other end of the frame.

[0024] The support member comprises a first support part, a second support part and a third support part connected in sequence, the first support part is in transmission connection with the first wheel assembly, the second support part is in L-shaped structure, the third support part is connected with the push rod assembly, the horizontal part of the second support part supports the seat plate, and the vertical part of the second support part supports the backrest.

[0025] The utility model discloses the beneficial effects of:

[0026] The trolley provided by the utility model, the push rod assembly is used for pushing the trolley by the user, the first linkage is arranged between the first wheel assembly and the second wheel assembly, the second linkage is arranged between the push rod assembly and one of the first wheel assembly and the second wheel assembly, when the push rod assembly moves, one of the first wheel assembly and the second wheel assembly can be driven to turn by the second linkage, the first linkage is driven to make the other one of the first wheel assembly and the second wheel assembly turn synchronously, the synchronous rotation of the first wheel assembly and the second wheel assembly is realized, the process of turning the trolley is smoother, without the need of additionally applying force to make the other wheel assembly turn after one of the wheel assemblies turns, the first wheel assembly and the second wheel assembly turn at the same time, the turning radius of the trolley is reduced, the turning is more flexible, and the experience of the user is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the first shaft side view of the trolley provided by the utility model embodiment;

[0028] Figure 2 is the second shaft side view of the trolley provided by the utility model embodiment;

[0029] Figure 3 is the bottom view of the trolley provided by the utility model embodiment;

[0030] Figure 4 is the left view of the trolley provided by the utility model embodiment;

[0031] Figure 5 is the schematic view of the trolley after being folded provided by the utility model embodiment;

[0032] Figure 6 is the right view of the trolley provided by the utility model embodiment.

[0033] In the drawing:

[0034] 1, frame; 2, push rod assembly; 3, first wheel assembly; 4, second wheel assembly; 5, first linkage; 6, second linkage; 8, seat frame;

[0035] 11, first support sleeve; 12, base frame; 13, second support sleeve; 14, connecting assembly; 141, connecting rod; 142, damping assembly; 143, holding piece; 144, cross bar;

[0036] 31, first wheel; 32, first linkage rod; 33, transmission tooth; 34, gear shaft; 35, gear; 36, first wheel shaft; 37, first connecting rod; 38, connecting frame;

[0037] 41, second wheel; 42, second wheel shaft; 43, second connecting rod;

[0038] 51, second linkage rod; 52, third linkage rod;

[0039] 61, support; 611, first support portion; 612, second support portion; 613, third support portion;

[0040] 81, seat plate; 82, backrest;

[0041] a, first axis; b, second axis. DETAILED DESCRIPTION

[0042] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0043] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0044] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0046] As Figure 1 and Figure 2As shown, the embodiment provides a cart, which comprises a frame 1, a push rod assembly 2 movably arranged on the frame 1, a first wheel assembly 3 arranged at one end of the frame 1, a second wheel assembly 4 arranged at the other end of the frame 1, a first linkage 5 arranged between the first wheel assembly 3 and the second wheel assembly 4, and a second linkage 6 arranged between the push rod assembly 2 and one of the first wheel assembly 3 and the second wheel assembly 4. When the push rod assembly 2 moves, one of the first wheel assembly 3 and the second wheel assembly 4 can be driven to turn by the second linkage 6, and the first linkage 5 is driven to turn synchronously with the other one of the first wheel assembly 3 and the second wheel assembly 4.

[0047] The cart provided by the embodiment can drive one of the first wheel assembly 3 and the second wheel assembly 4 to turn by the second linkage 6 when the push rod assembly 2 moves, and drive the first linkage 5 to turn synchronously with the other one of the first wheel assembly 3 and the second wheel assembly 4, so that the synchronous turning of the first wheel assembly 3 and the second wheel assembly 4 is realized, the turning process of the cart is smoother, and the other wheel assembly does not need to be additionally driven to turn after one of the wheel assemblies turns. The first wheel assembly 3 and the second wheel assembly 4 turn at the same time, the turning radius of the cart is reduced, the turning is more flexible, and the user experience is improved.

[0048] The second linkage 6 comprises a support member 61, which can be a support rod or a support pipe, and is not specifically limited here. The first end of the support member 61 is in transmission connection with the first wheel assembly 3 or the second wheel assembly 4, and the second end of the support member 61 is connected with the push rod assembly 2. The movement of the push rod assembly 2 can drive the support member 61 to move, and the force of the movement of the support member 61 is transmitted to the first wheel assembly 3 or the second wheel assembly 4 through a transmission structure to control the turning direction of the first wheel assembly 3 or the second wheel assembly 4. Alternatively, the support member 61 is in rotational connection with the push rod assembly 2, and the push rod assembly 2 can rotate relative to the support member 61 to fold the push rod assembly 2, so that the cart saves the occupied space when it is in an unused state.

[0049] The support member 61 can swing in the first direction relative to the frame 1 to drive the first wheel assembly 3 or the second wheel assembly 4 to turn.

[0050] Alternatively, a gear shaft 34 is rotatably arranged on the first wheel assembly 3 or the second wheel assembly 4, the first end of the support member 61 is movably connected with the gear shaft 34, the gear shaft 34 is connected with a gear 35, the gear 35 is in transmission connection with the first wheel assembly 3 or the second wheel assembly 4, and the first wheel assembly 3 or the second wheel assembly 4 is driven to turn by the support member 61 when the push rod assembly 2 moves, so that the transmission connection between the support member 61 and the first wheel assembly 3 or the second wheel assembly 4 is realized, and the structure is simple.

[0051] Optionally, a support sleeve is arranged on the frame 1 or the first wheel assembly 3 or the second wheel assembly 4, the first end of the support member 61 penetrates the support sleeve and is movably connected with the gear shaft 34, and the support member 61 can swing in the first direction relative to the support sleeve. The support sleeve provides support for the installation of the support member 61.

[0052] In some embodiments, as shown in Figure 1 and Figure 3 the first end of the support member 61 is drivingly connected with the first wheel assembly 3. Optionally, the first end of the support member 61 is arranged at one end of the frame 1 and is drivingly connected with the first wheel assembly 3, and extends towards the other end of the frame 1.

[0053] Specifically, the first wheel assembly 3 includes two first wheels 31, a first linkage rod 32 is arranged between the two first wheels 31, the two ends of the first linkage rod 32 are respectively rotatably connected with the two first wheels 31, a transmission tooth 33 is arranged on the first linkage rod 32 along the extending direction of the first linkage rod 32, the first end of the support member 61 is movably connected with a gear shaft 34, the gear shaft 34 is connected with a gear 35, the gear shaft 34 is rotatably connected with the first wheel assembly 3, the gear 35 is engaged with the transmission tooth 33, and the first linkage member 5 is connected with the first linkage rod 32 or the gear 35. The movement of the support member 61 drives the gear shaft 34 to rotate, the rotation of the gear shaft 34 drives the gear 35 to rotate around its own axis, thereby driving the first linkage rod 32 to move in the extending direction of the first linkage rod 32, the translation of the first linkage rod 32 drives the two first wheels 31 to synchronously and towards the same direction, thereby realizing the linkage of the two first wheels 31. The driving connection between the support member 61 and the first wheel assembly 3 is realized through the gear structure, which is labor-saving during operation. In addition, the transmission tooth 33 is machined on the first linkage rod 32, which reduces the number of components. The gear 35 can be a sector gear, which meets the maximum angle of rotation of the first wheel 31 and does not occupy space. Optionally, the first end of the support member 61 is connected with the gear shaft 34 in a universal manner.

[0054] The second end of the support member 61 is arranged at the other end of the frame 1 and is connected with the push rod assembly 2. When the push rod assembly 2 moves, it drives the support member 61 to drive the first wheel assembly 3 to turn, and then drives the second wheel assembly 4 to turn synchronously through the first linkage member 5. Optionally, in the direction in which the stroller advances, the first wheel assembly 3 is arranged at the front end of the frame 1, the second wheel assembly 4 is arranged at the rear end of the frame 1, and the push rod assembly 2 is arranged at the rear end of the frame 1.

[0055] In some embodiments, the first support sleeve 11 is arranged on one end of the frame 1, the first end of the support member 61 passes through the first support sleeve 11 and is movably connected with the gear shaft 34, and the support member 61 can swing in the first direction relative to the first support sleeve 11. The first support sleeve 11 supports the first end of the support member 61, so as to avoid the support member 61 from rotating in the up-down direction relative to the gear shaft 34. The first end of the support member 61 is movably connected with the gear shaft 34, the support member 61 swings in the first direction relative to the first support sleeve 11, drives the gear shaft 34 to rotate, and then drives the gear 35 to rotate, the gear 35 drives the first linkage rod 32 to move in the direction in which the first linkage rod 32 extends, and the first linkage rod 32 drives the two first wheels 31 to rotate synchronously, and the two first wheels 31 rotate in the same direction.

[0056] In some embodiments, the first support sleeve 11 is arranged on one end of the frame 1, the first end of the support member 61 passes through the first support sleeve 11 and is movably connected with the gear shaft 34, and the support member 61 can swing in the first direction relative to the first support sleeve 11. The first support sleeve 11 supports the first end of the support member 61, so as to avoid the support member 61 from rotating in the up-down direction relative to the gear shaft 34. The first end of the support member 61 is movably connected with the gear shaft 34, the support member 61 swings in the first direction relative to the first support sleeve 11, drives the gear shaft 34 to rotate, and then drives the gear 35 to rotate, the gear 35 drives the first linkage rod 32 to move in the direction in which the first linkage rod 32 extends, and the first linkage rod 32 drives the two first wheels 31 to rotate synchronously, and the two first wheels 31 rotate in the same direction.

[0057] The frame 1 can be folded, one end of the frame 1 is rotatably connected with the first wheel assembly 3 or the second wheel assembly 4 around the first shaft a, and the frame 1 is folded around the first shaft a to approach the support member 61 when the frame 1 is folded. When the stroller is not used, the frame 1 can be folded to save space.

[0058] In some embodiments, the first wheel assembly 3 further comprises a connecting frame 38, one end of the frame 1 is rotatably connected with the connecting frame 38 around the first shaft a, the two first wheels 31 are rotatably connected with the connecting frame 38 through the first wheel shaft 36 corresponding to each first wheel 31, the first linkage rod 37 is arranged on each first wheel shaft 36, one end of the first linkage rod 37 is fixedly connected with the first wheel shaft 36, and the other end of the first linkage rod 37 is rotatably connected with the end of the first linkage rod 32. The first linkage rod 37 is arranged to facilitate the connection between the first linkage rod 32 and the first wheel 31. The gear shaft 34 is rotatably connected with the connecting frame 38. The first support sleeve 11 is arranged on the connecting frame 38.

[0059] The frame 1 comprises a chassis 12 and a connecting assembly 14, one end of the chassis 12 is rotatably connected to the first wheel assembly 3 around the first shaft a, specifically, one end of the chassis 12 is rotatably connected to the connecting frame 38 around the first shaft a. The connecting assembly 14 is connected to the other end of the frame 1, the connecting assembly 14 is foldable, when the connecting assembly 14 is folded, the chassis 12 is driven to rotate around the first shaft a and close to the support 61, realizing the folding of the stroller in the height direction. The second support sleeve 13 rotatable around the second shaft b is arranged on the connecting assembly 14, the second end of the support 61 passes through the second support sleeve 13 and is connected with the push rod assembly 2. The support 61 can oscillate in the first direction relative to the second support sleeve 13, and can drive the first wheel assembly 3 to turn, and the second support sleeve 13 supports the second end of the support 61. When the frame 1 is folded, the connecting assembly 14 is folded and rotates around the second shaft b relative to the support 61, driving the frame 1 to move upwards around the first shaft a and close to the support 61.

[0060] Further, the second support sleeve 13 and the first support sleeve 11 are used in cooperation to support both ends of the support 61, so that the support 61 oscillates in the first direction to control the turning of the first wheel assembly 3.

[0061] Alternatively, the connecting assembly 14 comprises a connecting rod 141 and a damping assembly 142, one end of the damping assembly 142 is rotatably connected with the chassis 12, the other end is rotatably connected with the connecting rod 141, the second support sleeve 13 is rotatably connected with the connecting rod 141, and the connecting rod 141 and the damping assembly 142 close to each other when the connecting assembly 14 is folded. The connecting rod 141 is connected with the chassis 12 through the damping assembly 142, and the damping assembly 142 is arranged close to the second wheel assembly 4. During the process of pushing the stroller, the damping assembly 142 plays a damping role for the whole stroller, improving the comfort of the child riding. The structure of the damping assembly 142 is the prior art, which will not be described in detail here.

[0062] The connecting rod 141 is in U-shaped structure, the two ends of the connecting rod 141 are respectively connected with the damping assembly 142, the second support sleeve 13 is connected with the middle part of the connecting rod 141, and the push rod assembly 2 is arranged on the connecting rod 141, improving the height of the arrangement of the push rod assembly 2, and facilitating the user to push the stroller through the push rod assembly 2.

[0063] In combination with Figure 1 , Figure 4 and Figure 5As shown, in some possible implementation, the damping assembly 142 is rotationally connected with the chassis 12, the second support sleeve 13 is rotationally connected with the connecting rod 141, the chassis 12 is provided with a holding piece 143 on each of the opposite sides, one end of the holding piece 143 is rotationally connected with the chassis 12, a cross bar 144 is arranged between the holding piece 143 and the corresponding connecting rod 141, one end of the cross bar 144 is rotationally connected with the corresponding holding piece 143, the other end of the cross bar 144, the connecting rod 141 and the damping assembly 142 are rotationally connected at one point, when the frame 1 is folded, the holding piece 143 and the cross bar 144 are close to each other. Rotate the holding piece 143 downward, the cross bar 144 drives the damping assembly 142 to rotate downward, the holding piece 143 and the damping assembly 142 are both rotated toward the front end of the stroller, the connecting rod 141 is rotated relative to the damping assembly 142 and toward the rear end of the stroller, the holding piece 143 and the cross bar 144 are close to each other, thereby driving the chassis 12 to close to the support 61 around the first axis a, thereby realizing the folding of the stroller in the height direction, without occupying space. Further, the push rod assembly 2 is folded downward relative to the support 61, further reducing the height of the stroller.

[0064] In some possible implementation, the second wheel assembly 4 includes two second wheels 41, the first linkage 5 includes a second linkage rod 51 arranged between the two second wheels 41, both ends of the second linkage rod 51 are rotationally connected with the two second wheels 41, respectively, and the second linkage rod 51 is provided with a third linkage rod 52 between the first linkage rod 32, both ends of the third linkage rod 52 are rotationally connected with the first linkage rod 32 and the second linkage rod 51, respectively. When the first linkage rod 32 moves, the second linkage rod 51 is driven to move along the extension direction of the second linkage rod 51 by the third linkage rod 52, thereby driving the two second wheels 41 to turn synchronously, so as to realize the simultaneous turning of the first wheel assembly 3 and the second wheel assembly 4.

[0065] Optionally, the second wheel 41 is rotationally connected with the frame 1 through a second wheel shaft 42, and each second wheel shaft 42 is respectively provided with a second connecting rod 43 correspondingly, one end of the second connecting rod 43 is fixedly connected with the second wheel shaft 42, and the other end of the second connecting rod 43 is rotationally connected with the end of the second linkage rod 51. The second connecting rod 43 is arranged to facilitate the connection of the second linkage rod 51 and the second wheel 41.

[0066] The first linkage rod 32 and the second linkage rod 51 are both U-shaped structure rods.

[0067] Referring to Figure 1 and Figure 6As shown, in some embodiments, the stroller further comprises a seat frame 8, which is arranged on the support 61 and supported thereby, reducing the number of components. Further, the holding members 143 are arranged on opposite sides of the seat frame 8, and the height of the holding members 143 when unfolded is suitable for a child to hold onto the seat frame 8. The holding members 143 can be L-shaped structural members, with the horizontal portions arranged on opposite sides of the seat frame 8, facilitating holding by the child and also serving to shield the child from falling off the sides of the seat frame 8.

[0068] Optionally, the seat frame 8 comprises a seat plate 81 and a backrest 82, which are arranged at an angle. The seat plate 81 is for the child to sit on, and the backrest 82 is for the child to lean against. The support 61 extends obliquely from one end of the frame 1 towards the upper rear of the other end of the frame 1. The support 61 comprises a first support portion 611, a second support portion 612, and a third support portion 613 connected in sequence, the first support portion 611 is in transmission connection with the first wheel assembly 3, the second support portion 612 is L-shaped, and the third support portion 613 is connected with the push rod assembly 2. The horizontal portion of the second support portion 612 supports the seat plate 81, and the vertical portion of the second support portion 612 supports the backrest 82. The first support portion 611 is arranged lower than the third support portion 613. The second support portion 612 of the support 61 is arranged in adaptation to the structure of the seat frame 8, to stably support the seat frame 8.

[0069] Optionally, the support 61 is a support rod or a support tube, and the first support portion 611 and the horizontal portion of the second support portion 612 are arranged at an obtuse angle. The first support portion 611 extends obliquely downward relative to the second support portion 612, to facilitate transmission connection with the first wheel assembly 3. The third support portion 613 and the vertical portion of the second support portion 612 are arranged at an obtuse angle. The third support portion 613 extends obliquely upward relative to the second support portion 612, to facilitate connection with the push rod assembly 2.

[0070] In other embodiments, the first end of the support is in transmission connection with the second wheel assembly 4, and the second end of the support is connected with the push rod assembly 2. The first support sleeve is arranged on the second wheel assembly 4, and the second support sleeve is arranged on the connecting assembly 14. The first end of the support passes through the first support sleeve, and the second end of the support passes through the second support sleeve. The support can swing in the first direction relative to the first support sleeve and the second support sleeve, to transmit power to the second wheel assembly 4, to make the second wheel assembly 4 turn, to drive the first linkage to make the first wheel assembly 3 turn synchronously.

[0071] Optionally, the second wheel assembly 4 comprises two second wheels 41, a second linkage rod is arranged between the two second wheels 41, two ends of the second linkage rod are rotatably connected with the two second wheels 41 respectively, a transmission gear is arranged on the second linkage rod along the extending direction of the second linkage rod, the first end of the support member is movably connected with a gear shaft, the gear shaft is connected with a gear, the gear shaft is rotatably connected with the second wheel assembly 4, and the gear is meshed with the transmission gear. The support member drives the gear shaft to rotate, the gear shaft drives the gear to rotate around the axis of the gear shaft, thereby driving the second linkage rod to move in the extending direction of the second linkage rod, the second linkage rod drives the two second wheels 41 to synchronously rotate towards the same direction, thereby realizing linkage of the two second wheels 41.

[0072] The first wheel assembly 3 comprises two first wheels 31, a first linkage rod is arranged between the two first wheels 31, two ends of the first linkage rod are rotatably connected with the two first wheels 31 respectively, a third linkage rod is arranged between the first linkage rod and the second linkage rod or the gear, one end of the third linkage rod is rotatably connected with the first linkage rod, and the other end of the third linkage rod is rotatably connected with the second linkage rod or the gear.

[0073] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A cart, characterized in that, The application relates to a stroller, which comprises a frame, a push rod assembly movably arranged on the frame, a first wheel assembly arranged at one end of the frame, a second wheel assembly arranged at the other end of the frame, a first linkage arranged between the first wheel assembly and the second wheel assembly, and a second linkage arranged between the push rod assembly and one of the first wheel assembly and the second wheel assembly; when the push rod assembly moves, one of the first wheel assembly and the second wheel assembly can be driven to turn by the second linkage, and the first linkage can drive the other of the first wheel assembly and the second wheel assembly to turn synchronously.

2. The cart of claim 1, wherein, The second linkage comprises a support, the first end of the support is in transmission connection with the first wheel assembly or the second wheel assembly, and the second end of the support is connected with the push rod assembly.

3. The cart of claim 2, wherein, A gear shaft is arranged on the first wheel assembly or the second wheel assembly to rotate, the first end of the support is movably connected with the gear shaft, the gear shaft is connected with a gear, the gear is in transmission connection with the first wheel assembly or the second wheel assembly, and when the push rod assembly moves, the first wheel assembly or the second wheel assembly can be driven to turn by the support.

4. The cart of claim 3, wherein, The first end of the support is in transmission connection with the first wheel assembly. The first wheel assembly comprises two first wheels, a first linkage rod is arranged between the two first wheels, the two ends of the first linkage rod are movably connected with the two first wheels respectively, a transmission gear is arranged on the first linkage rod along the extending direction of the first linkage rod, the gear is in mesh with the transmission gear, and the first linkage is connected with the first linkage rod or the gear. The first end of the support is in transmission connection with the first wheel assembly at one end of the frame and extends towards the other end of the frame, and the second end of the support is connected with the push rod assembly at the other end of the frame. The support can swing in the first direction relative to the frame to drive the first wheel assembly or the second wheel assembly to turn.

5. The cart of claim 3, wherein, A support sleeve is arranged on the frame, the first wheel assembly or the second wheel assembly, the first end of the support passes through the support sleeve and is movably connected with the gear shaft, and the support can swing in the first direction relative to the support sleeve.

6. The stroller according to claim 2, wherein The frame can be folded, one end of the frame is movably connected with the first wheel assembly or the second wheel assembly around a first shaft, and when the frame is folded, the frame moves upwards around the first shaft and approaches the support. A first support sleeve is fixedly arranged on the first wheel assembly, the first end of the support passes through the first support sleeve and is in transmission connection with the first wheel assembly, and when the frame is folded, the frame moves upwards around the first shaft and approaches the support.

7. The cart of claim 6, wherein, The frame comprises a bottom frame and a connecting assembly, one end of the bottom frame is movably connected with the first wheel assembly around a first shaft, the connecting assembly is connected with the other end of the bottom frame, the connecting assembly can be folded, and when the connecting assembly is folded, the bottom frame is driven to move around the first shaft and approach the support. ​ The connecting assembly is provided with a second support sleeve rotating around a second axis, the second end of the support member penetrates the second support sleeve and is connected with the push rod assembly, when the frame is folded, the connecting assembly is folded and rotates around the second axis relative to the support member, driving the frame to move around the first axis towards the support member.

8. The cart of claim 7, wherein, The connecting assembly comprises a connecting rod and a damping assembly, one end of the damping assembly is rotationally connected with the chassis, the other end is rotationally connected with the connecting rod, the second support sleeve is rotationally connected with the connecting rod, when the connecting assembly is folded, the connecting rod and the damping assembly are close to each other; The chassis is provided with a holding member on each of the opposite sides, one end of the holding member is rotationally connected with the chassis, a cross bar is arranged between the holding member and the corresponding connecting rod, one end of the cross bar is rotationally connected with the corresponding holding member, the other end of the cross bar, the connecting rod and the damping assembly are rotationally connected at a point, when the frame is folded, the holding member and the cross bar are close to each other; The push rod assembly is movably connected with the support member, and the push rod assembly can be folded relative to the support member.

9. The cart of claim 4, wherein, The second wheel assembly comprises two second wheels, the first linkage comprises a second linkage rod arranged between the two second wheels, the two ends of the second linkage rod are rotationally connected with the two second wheels respectively, and a third linkage rod is arranged between the second linkage rod and the first linkage rod, the two ends of the third linkage rod are rotationally connected with the first linkage rod and the second linkage rod respectively.

10. The cart of claim 3, wherein, The stroller further comprises a seat frame, and the seat frame is arranged on the support member; The seat frame comprises a seat plate and a backrest, and the backrest is arranged at an angle with the seat plate; The support member extends obliquely from one end of the frame to the upper rear of the other end of the frame; The support member comprises a first support portion, a second support portion and a third support portion connected in sequence, the first support portion is drivingly connected with the first wheel assembly, the second support portion has an L-shaped structure, the third support portion is connected with the push rod assembly, the horizontal portion of the second support portion supports the seat plate, and the vertical portion of the second support portion supports the backrest.

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