Trolley

Abstract

The utility model discloses a cart which comprises a cart frame with an unfolded state and a folded state, the cart frame comprises a seat, a front support and a rear support, and the front support and the rear support are respectively matched with the seat in a rotating mode. The front support is arranged on the seat in a sliding mode in the direction close to or away from the rear support, and in the folding state, the front support slides to be close to the rear support, and the front support is located between the seat and the rear support; or the rear support is arranged on the seat in a sliding mode in the direction close to or away from the front support, and in the folding state, the rear support slides to be close to the front support, and the rear support is located between the seat and the front support. The cart is compact in structure, small in size and convenient to carry and store after being folded.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of trolleys. BACKGROUND

[0002] In prior art, the trolley frame of most trolleys can be folded. The trolley frame is generally composed of multiple components connected by rotation and / or sliding. When the connecting mode of the rod and the rod of the trolley frame is different, the folding mode of the trolley frame is also different, and the size of the trolley as a whole after folding is also different. Some trolleys in prior art have the problems of inconvenient folding operation, large structure size after folding, and inconvenient carrying and storage. SUMMARY

[0003] The utility model aims at the deficiency in prior art, and provides a trolley which is convenient to fold and has compact structure and small size after folding.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0005] A trolley includes a trolley frame having an unfolded state and a folded state, the trolley frame includes a seat, a front support and a rear support respectively rotationally matched with the seat;

[0006] The front support is slidingly arranged on the seat along the direction of approaching or moving away from the rear support. In the folded state, the front support is slidingly arranged to approach the rear support, and the front support is located between the seat and the rear support.

[0007] Or the rear support is slidingly arranged on the seat along the direction of approaching or moving away from the front support. In the folded state, the rear support is slidingly arranged to approach the front support, and the rear support is located between the seat and the front support.

[0008] Preferably, the trolley frame further includes a backrest and a linkage mechanism, two of the upper part of the rear support, the rear part of the seat and the lower part of the backrest are rotationally connected, the third is rotationally connected with any one of the two, or the three are coaxially rotationally connected.

[0009] The linkage mechanism is movably connected with the backrest and the front support respectively, so that when the backrest approaches the seat, the linkage mechanism drives the front support to slide in the direction of approaching the rear support and rotate to approach the seat.

[0010] Further, the linkage mechanism includes a support rod rotationally connected to the seat and a linkage rod. In the unfolded state, the support rod has a first support rod extension part extending above the seat and a second support rod extension part extending below the seat.

[0011] The first strut extension and / or the second strut extension is / are rotationally or slidably connected with the seat, the second strut extension is rotationally or slidably connected with the front support, the first strut extension is rotationally or slidably connected with the linkage, and the linkage is rotationally or slidably connected with the backrest.

[0012] Further, the strut is rotationally connected with the seat along a first axis, rotationally connected with the front support along a second axis, rotationally connected with the linkage along a third axis, and the linkage is rotationally connected with the backrest along a fourth axis.

[0013] The first axis is arranged opposite to the fifth axis at a position close to the front end of the seat, and in the front-rear direction, the first axis is located in front of the fifth axis.

[0014] Further, in the unfolded state, the linkage is located above the seat, and the linkage is arranged as a whole in the horizontal direction to serve as a handrail of the stroller.

[0015] Further, the linkage is arranged on the left and right sides of the backrest respectively, or the linkage comprises side rods arranged on the left and right sides, each of the side rods extends in the front-rear direction, and the linkage further comprises a cross rod extending in the left-right direction, two ends of the cross rod are fixedly connected or integrally arranged with front end portions of the side rods on the left and right sides respectively.

[0016] Further, the stroller frame further comprises a sliding member slidably arranged on the seat in the front-rear direction, and an upper portion of the front support is rotationally connected with the sliding member.

[0017] One of the seat and the sliding member is provided with a first sliding groove, and the other is provided with a protrusion matched with the first sliding groove, the protrusion is located in the first sliding groove and is slidably arranged in the first sliding groove in the length direction of the first sliding groove.

[0018] When the stroller frame is in the unfolded state, the sliding member is located at the front end portion of the seat, and when the stroller frame is in the folded state, the sliding member is located at the rear end portion of the seat.

[0019] Further, the stroller frame further comprises a first connecting rod and a second connecting rod, one end portion of the first connecting rod is rotationally connected with one end portion of the second connecting rod, the other end portion of the first connecting rod is rotationally connected with the backrest, the other end portion of the second connecting rod is rotationally connected with the rear support, and the rotation axis of the first connecting rod and the second connecting rod is also slidably arranged on the seat in the front-rear direction.

[0020] Further, a second sliding groove extending in the front-rear direction is arranged on the seat, and the rotation shaft of the first connecting rod and the second connecting rod is arranged in the second sliding groove and is arranged to be slidable along the length direction of the second sliding groove.

[0021] When the stroller frame is in the unfolded state, the rotation shaft of the first connecting rod and the second connecting rod is arranged at the rear end of the second sliding groove, and when the stroller frame is in the folded state, the rotation shaft of the first connecting rod and the second connecting rod is arranged at the front end of the second sliding groove.

[0022] Further, the seat comprises a seat plate and a connecting portion extending downward from the side of the seat plate, the stroller frame further comprises a sliding member rotatably connected with the upper portion of the front support, the sliding member is arranged on the inner side of the connecting portion to be slidable in the front-rear direction, and the rotation shaft of the first connecting rod and the second connecting rod is arranged on the outer side of the connecting portion to be slidable in the front-rear direction; when the stroller is folded and unfolded, the sliding directions of the rotation shaft of the first connecting rod and the second connecting rod and the sliding member are opposite.

[0023] Further, the stroller further comprises an electric driving mechanism for automatically folding and unfolding the stroller frame, the electric driving mechanism comprises a transmission mechanism connected with the backrest and the rear support respectively and a motor arranged on the rear support or the backrest for driving the transmission mechanism to act.

[0024] Further, the stroller frame further comprises a push rod rotatably connected with the seat, the push rod has a first working position and a second working position, when the push rod is in the first working position, the push rod is close to the backrest, and the stroller is in a forward use state; when the push rod is in the second working position, the push rod is away from the backrest, and the stroller is in a reverse use state.

[0025] Thanks to the use of the above technical scheme, the stroller of the present application has the following advantages compared with the prior art: when the stroller is folded, one of the front support and the rear support is arranged to be slidable relative to the seat and to be rotatable, so as to be folded between the other one and the seat, so that the folded stroller has a compact structure and a small volume, and is convenient to carry and store. BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is a perspective view of the stroller of the present application in the unfolded state (with the push rod); Figure 1 FIG. 2 is a perspective view of the stroller of the present application in the folded state (with the push rod); FIG. 3 is a side view of the stroller of the present application in the unfolded state (with the push rod);

[0027] FIG. 4 is a side view of the stroller of the present application in the folded state (with the push rod); Figure 2 FIG. 5 is a perspective view of the stroller of the present application in the unfolded state (without the push rod); FIG. 6 is a perspective view of the stroller of the present application in the folded state (without the push rod);

[0028] FIG. 7 is a side view of the stroller of the present application in the unfolded state (without the push rod); Figure 3Exploded view of the stroller of Example 1 (without push bar);

[0029] Figure 1 Figure 4 Figure 2

[0030] Figure 3 Figure 5 Figure 4

[0031] Figure 5 Figure 6 Figure 6

[0032] Figure 7 Figure 7 Figure 8

[0033] Figure 9 Figure 8 Figure 10

[0034] Figure 11 Figure 9 Figure 12

[0035] Figure 13 Figure 10 Figure 14

[0036] Figure 15 Figure 11 Figure 16

[0037] Figure 17 Figure 12 Figure 18

[0038] Figure 19 Figure 13 Figure 20

[0039] Figure 21 Figure 14 Figure 22

[0040] Figure 23 Figure 15 Figure 24

[0041] Figure 25 Figure 16 Figure 26

[0042] Figure 27 Figure 17 Figure 28

[0043] Appendix Figure 18 This is a three-dimensional schematic diagram of the trolley in the folded state of Embodiment 1;

[0044] Appendix Figure 19 This is a side view of the trolley in the folded state of Embodiment 1.

[0045] The components are as follows: 11. Front support; 12. Rear support; 13. Seat; 131. Seat plate; 132. Connecting part; 132a. Protrusion; 132b. Second slide groove; 14. Backrest; 141. Backrest plate; 142. Side wing; 15. Linkage rod; 16. Support rod; 17. Sliding part; 171. First slide groove; 18. First connecting rod; 19. Second connecting rod; 2. Front wheel assembly; 3. Rear wheel assembly; 41. First axle; 42. Second axle; 43. Third axle; 44. Fourth axle; 45. Fifth axle; 46. Sixth axle; 47. Seventh axle; 48. Eighth axle; 49. Ninth axle; 5. Footrest; 6. Push rod. Detailed Implementation

[0046] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] In the following description, the directions "front," "back," "left," "right," "up," and "down" all refer to... Figure 2 In the figure, the left direction is "front", the right direction is "back", the top direction is "up", and the bottom direction is "down". The directions perpendicular to the paper are "left" and "right". The above definitions of directions are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Example 1

[0049] like Figures 1-19 As shown, the trolley of this utility model includes a trolley frame having an unfolded state and a folded state, a front wheel assembly 2 disposed at the bottom front of the trolley frame, and a rear wheel assembly 3 disposed at the bottom rear of the trolley frame.

[0050] The stroller frame includes a front support 11, a rear support 12, and a seat 13.

[0051] The front wheel assembly 2 is located at the lower part of the front support 11, and the rear wheel assembly 3 is located at the lower part of the rear support 12. The front support 11 and the rear support 12 are rotatably connected to the seat 13, and one of the front support 11 and the rear support 12 can also slide on the seat 13 in a direction closer to or further away from the other. Thus, when the trolley is folded, the front support 11 or the rear support 12 can slide relative to the seat 13 to bring the front support 11 and the rear support 12 closer together. At the same time, the front support 11 and the rear support 12 can also rotate relative to the seat 13 to bring them closer together, so that when the trolley is folded, the front support 11 or the rear support 12 slides until they are close together, and one of the front support 11 and the rear support 12 folds down between the seat 13 and the other.

[0052] In this embodiment, the front support 11 is slidably mounted on the seat 13 in the front-back direction. When the trolley is folded, the front support 11 slides backward relative to the seat 13 and moves closer to the rear support 12.

[0053] The stroller frame also includes a backrest 14 and a linkage mechanism. Two of the upper part of the rear support 12, the rear part of the seat 13, and the lower part of the backrest 14 are rotatably connected, and the third part is rotatably connected to either of the aforementioned two parts, or the three parts are coaxially rotatably connected. In this embodiment, it is preferable that the upper part of the rear support 12, the rear part of the seat 13, and the lower part of the backrest 14 are coaxially rotatably connected.

[0054] The linkage mechanism is connected to the backrest 14, the seat 13 and the front support 11 respectively, so that when the backrest 14 rotates relative to the seat 13, it can link the front support 11, causing the front support 11 to rotate and slide relative to the seat 13, thereby bringing the front support 11 closer to the seat 13 or away from the seat 13.

[0055] Specifically, such as Figures 1-19 As shown, the linkage mechanism includes a linkage rod 15 and a support rod 16. The support rod 16 includes a first support rod extension and a second support rod extension, which are integrally formed or fixedly connected. When the trolley is in the unfolded state, the first support rod extension extends above the seat 13, and the second support rod extension extends below the seat 13. The first support rod extension and / or the second support rod extension are rotatably or slidably engaged with the seat 13, the second support rod extension is rotatably or slidably engaged with the front support 11, the first support rod extension is rotatably or slidably engaged with the linkage rod 15, and the linkage rod 15 is rotatably or slidably engaged with the backrest 14.

[0056] Specifically in this embodiment, the rear part of the linkage rod 15 is rotatably connected to the backrest 14, one end of the first support rod extension and one end of the second support rod extension intersect, and the intersection is rotatably connected to the seat 13, the front part of the linkage rod 15 is rotatably connected to the other end of the first support rod extension, and the other end of the second support rod extension is rotatably connected to the front bracket 11.

[0057] The stroller frame further comprises a sliding member 17 which is slidably arranged on the seat 13 in the front-rear direction, and the upper portion of the front support 11 is rotationally connected with the sliding member 17.

[0058] In this way, a four-bar linkage mechanism is formed among the seat 13, the backrest 14, the linkage rod 15 and the brace rod 16, and a slider-crank mechanism is formed among the brace rod 16, the front support 11, the sliding member 17 and the seat 13. When one of the components of the stroller frame is actuated, the remaining components can be simultaneously actuated through the four-bar linkage mechanism and the slider-crank mechanism, so that the folding and unfolding operations of the stroller are very convenient.

[0059] In the present embodiment, the intersection of the first brace rod extension and the second brace rod extension is rotationally connected with the seat 13 along a first axis 41, the second brace rod extension is rotationally connected with the front support 11 along a second axis 42, the first brace rod extension is rotationally connected with the linkage rod 15 along a third axis 43, the linkage rod 15 is rotationally connected with the backrest 14 along a fourth axis 44, the front support 11 is rotationally connected with the sliding member 17 along a fifth axis 45, and the upper portion of the rear support 12, the rear portion of the seat 13 and the lower portion of the backrest 14 are coaxially rotationally connected along a sixth axis 46.

[0060] As shown in Figures 1-19 , the stroller frame can further comprise a first connecting rod 18 and a second connecting rod 19. One end of the first connecting rod 18 is rotationally connected with one end of the second connecting rod 19 through a seventh axis 47, the other end of the first connecting rod 18 is rotationally connected with the backrest 14 through an eighth axis 48, the other end of the second connecting rod 19 is rotationally connected with the rear support 12 through a ninth axis 49, and the seventh axis 47 is slidably arranged on the seat 13 in the front-rear direction. In this way, when the backrest 14 is rotated relative to the seat 13, the rear support 12 can be simultaneously rotated relative to the seat 13 through the linkage of the first connecting rod 18 and the second connecting rod 19, so that the folding operation of the stroller is more convenient.

[0061] As shown in Figures 1-19 , in the present embodiment, the seat 13 comprises a seat plate 131 and connecting portions 132 which extend downward from the left and right sides of the seat plate 131.

[0062] As shown in Figure 3 , one of the connecting portions 132 and the sliding member 17 is provided with a first sliding groove 171, and the other is provided with a protrusion 132a which is adapted to the first sliding groove 171. The protrusion 132a is located in the first sliding groove 171 and can slide along the length extension direction of the first sliding groove 171. In the present embodiment, the first sliding groove 171 is arranged on the sliding member 17, and the protrusion 132a is arranged on the connecting portion 132, and the protrusion 132a extends in the front-rear direction.

[0063] As shown in Figures 1-19 , the connecting part 132 is further provided with a second sliding groove 132b extending along the front-rear direction, and the seventh shaft 47 is located in the second sliding groove 132b and can slide along the length direction of the second sliding groove 132b.

[0064] When the stroller is folded from the unfolded state, the sliding part 17 slides backward relative to the connecting part 132, and the seventh shaft 47 slides forward along the second sliding groove 132b. The sliding part 17 is slidably connected to the inner side of the connecting part 132, and the seventh shaft 47 is slidably connected to the outer side of the connecting part 132, so that interference between the sliding part 17 and the seventh shaft 47 during folding of the stroller can be avoided, thereby affecting the folding operation of the stroller, and the stroller cannot be folded to the minimum structure size.

[0065] As shown in Figures 1-11 , the backrest 14 can be in the form of a backrest plate 141, and the backrest 14 can further include side wings 142 extending forward from the left and right sides of the backrest plate 141. The upper part of the rear support 12, the rear part of the connecting part 132, and the lower part of the side wing 142 are coaxially rotatably connected by the first shaft 41, and the strut 16 is rotatably connected to the front part of the connecting part 132 by the sixth shaft 46.

[0066] In other embodiments, the backrest 14 can also be in the form of a backrest rod, and the backrest 14 can further include a cloth cover (not shown in the figure) arranged on the backrest rod, as shown in Figures 12-19 .

[0067] When the stroller is in the unfolded state, the linkage rod 15 is located above the seat 13, and the linkage rod 15 is arranged to extend in the horizontal direction as a handrail of the stroller.

[0068] As shown in Figures 1-11 , the linkage rod 15 can be arranged on the left and right sides of the stroller frame, respectively, i.e. the front part of the stroller seating space is not blocked, and at this time the stroller is an old people's stroller, which is convenient for old people to get in and out of the seating space.

[0069] In other embodiments, as shown in Figures 12-19 , the linkage rod 15 includes side rods 151 located on the left and right sides, and each side rod 151 extends in the front-rear direction. The linkage rod 15 further includes a cross rod 152 extending in the left-right direction, and the two ends of the cross rod 152 are fixedly connected or integrally arranged with the front end parts of the side rods 151 on the left and right sides, respectively, i.e. the linkage rod 15 as a whole has a U-shaped structure with the opening facing backward. At this time, the stroller is a child stroller, and the cross rod 152 of the linkage rod 15 blocks the front of the stroller seating space, which can protect the child and prevent the child from falling from the front.

[0070] As shown in Figures 1-19As shown, the front support 11, the rear support 12, the support rod 16, the sliding member 17, the first connecting rod 18, and the second connecting rod 19 are respectively set on the left and right sides of the trolley frame.

[0071] The stroller frame also includes a footrest 5, which extends in the left and right direction, and the left and right ends of the footrest 5 are respectively connected to the lower part of the front bracket 11 on the left and right sides.

[0072] like Figures 12-19 As shown, the trolley frame may also include a push rod 6, which is rotatably connected to the seat 13. Rotation of the push rod 6 relative to the seat 13 allows the push rod 6 to have a first working position and a second working position.

[0073] When push rod 6 is in the first working position, push rod 6 is close to backrest 14, preferably the plane of push rod 6 coincides with the plane of backrest 14, at which time the trolley is in the forward use state, such as... Figure 12 and Figure 13 As shown.

[0074] When push rod 6 is in the second working position, push rod 6 moves away from backrest 14 and rotates to a position in front of backrest 14. At this time, the trolley is in reverse use mode, such as... Figure 14 and Figure 15 As shown.

[0075] When the trolley is in the unfolded state, on the front support 11, the fifth axle 45 is located above the second axle 42. On the rear support 12, the sixth axle 46 is located above the ninth axle 49. On the seat 13, the first axle 41, the fifth axle 45, the seventh axle 47, and the sixth axle 46 are arranged sequentially from front to back. On the backrest 14, the fourth axle 44, the eighth axle 48, and the sixth axle 46 are arranged sequentially from top to bottom. On the support rod 16, the third axle 43, the first axle 41, and the second axle 42 are arranged sequentially from top to bottom. The slider 17 is located at the front end of the connecting part 132, and the seventh axle 47 is located at the rear end of the second slide groove 132b. Figure 1 , Figure 2 , Figures 12-15 As shown.

[0076] When the trolley is in the unfolded state, it can be pushed in the forward direction or in the reverse direction.

[0077] When the stroller is folded from the unfolded state, the stroller is in the forward use state, the push rod 6 is rotated forward to close to the seat 13, the backrest 14 is rotated forward around the sixth shaft 46 to close to the seat 13, the support rod 16 is rotated downward around the fourth shaft 44 to close to the seat 13 through the linkage rod 15, and the sliding member 17 is slid backward along the convex portion 132a to rotate the front support 11 upward around the fifth shaft 45 to close to the seat 13. When the backrest 14 is rotated forward, the seventh shaft 47 is slid forward along the second sliding groove 132b through the first connecting rod 18, and the rear support 12 is pulled to rotate forward around the sixth shaft 46 to close to the seat 13 through the second connecting rod 19. The folding process is shown in Figures 4-9 、 Figure 16 and Figure 17 . Until all the components of the stroller frame are closely closed together, the final folding is shown in Figure 10 、 Figure 11 、 Figure 18 and Figure 19 . The folded stroller structure is compact and small in size, thereby facilitating the carrying and storage of the stroller.

[0078] Embodiment 2

[0079] In this embodiment, the stroller frame is not provided with the first connecting rod 18 and the second connecting rod 19, and the stroller frame is automatically folded and unfolded by the electric driving mechanism.

[0080] The electric driving mechanism includes a transmission mechanism and a motor, the transmission mechanism is connected with the backrest 14 and the rear support 12 respectively, and the motor is arranged on the rear support 12 or the backrest 14. The motor drives the transmission mechanism to act, and when the transmission mechanism acts, the relative rotation between the backrest 14 and the rear support 12 is realized, and when the backrest 14 rotates, the remaining components act, and the specific action process is the same as that of embodiment 1.

[0081] The transmission mechanism can adopt a gear transmission mechanism. Specifically, the transmission mechanism includes a first bevel gear arranged on the backrest 14 and a second bevel gear arranged on the rear support 12, and the first bevel gear is engaged with the second bevel gear. The motor has a motor shaft, and one of the first bevel gear and the second bevel gear is fixedly connected with the motor shaft in the same axis. When the motor starts, one of the first bevel gear and the second bevel gear is driven to rotate, so that the other one synchronously rotates, thereby realizing the relative rotation between the backrest 14 and the rear support 12.

[0082] The transmission mechanism can also adopt other transmission mechanisms, such as a worm gear transmission mechanism.

[0083] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A trolley, characterized in that: The trolley frame includes an unfolded state and a folded state, and the trolley frame includes a seat, a front support and a rear support that are rotatably engaged with the seat; The front support is slidably disposed on the seat in a direction that approaches or moves away from the rear support; in the folded state, the front support slides to be close to the rear support, and the front support is located between the seat and the rear support; Alternatively, the rear support may be slidably disposed on the seat in a direction close to or away from the front support. In the folded state, the rear support may slide to be close to the front support, and the rear support may be located between the seat and the front support.

2. The trolley according to claim 1, characterized in that: The trolley frame also includes a backrest and a linkage mechanism. Two of the three parts—the upper part of the rear support, the rear part of the seat, and the lower part of the backrest—are rotatably connected, and the third part is rotatably connected to either of the aforementioned two parts, or the three parts are rotatably connected coaxially. The linkage mechanism is movably connected to the backrest and the front support respectively, so that when the backrest moves closer to the seat, the linkage mechanism drives the front support to slide and rotate towards the rear support until it moves closer to the seat.

3. The trolley according to claim 2, characterized in that: The linkage mechanism includes a support rod and a linkage rod rotatably connected to the seat. In the unfolded state, the support rod has a first support rod extension extending above the seat and a second support rod extension extending below the seat. The first support rod extension and / or the second support rod extension are rotatably or slidably engaged with the seat, the second support rod extension is rotatably or slidably engaged with the front support, the first support rod extension is rotatably or slidably engaged with the linkage rod, and the linkage rod is rotatably or slidably engaged with the backrest.

4. The trolley according to claim 3, characterized in that: The support rod is rotatably connected to the seat along the first axis, the support rod is rotatably connected to the front support along the second axis, the support rod is rotatably connected to the linkage rod along the third axis, and the linkage rod is rotatably connected to the backrest along the fourth axis. The first axis is positioned near the front end of the seat, the front support is rotatably connected to the seat along the fifth axis, and in the front-rear direction, the first axis is located in front of the fifth axis.

5. The trolley according to claim 3, characterized in that: In the unfolded state, the linkage rod is located above the seat, and the linkage rod extends horizontally as a handrail of the trolley.

6. The trolley according to claim 5, characterized in that: The linkage rods are respectively arranged on the left and right sides of the backrest; or the linkage rods include side rods located on the left and right sides, each side rod extending in the front-back direction, and the linkage rods also include crossbars extending in the left-right direction, the two ends of the crossbars being fixedly connected to or integrally formed with the front ends of the side rods on the left and right sides respectively.

7. The trolley according to claim 3, characterized in that: The trolley frame also includes a sliding member that can be slidably mounted on the seat in the front-back direction, and the upper part of the front support is rotatably connected to the sliding member; One of the seat and the slider is provided with a first slide groove, and the other is provided with a protrusion adapted to the first slide groove. The protrusion is located in the first slide groove and is slidably disposed in the first slide groove along the length extension direction of the first slide groove. When the trolley frame is in the unfolded state, the slider is located at the front end of the seat; when the trolley frame is in the folded state, the slider is located at the rear end of the seat.

8. The trolley according to claim 3, characterized in that: The stroller frame also includes a first link and a second link. One end of the first link is rotatably connected to one end of the second link, the other end of the first link is rotatably connected to the backrest, and the other end of the second link is rotatably connected to the rear support. The pivot shaft connecting the first link and the second link can also be slidably mounted on the seat in the front-back direction.

9. The trolley according to claim 8, characterized in that: The seat is provided with a second slide groove extending in the front-to-back direction. The pivot shaft that is rotatably connected to the first link and the second link is located in the second slide groove and is slidably arranged along the length extension direction of the second slide groove. When the trolley frame is in the unfolded state, the pivot connecting the first link and the second link is located at the rear end of the second slide. When the trolley frame is in the folded state, the pivot connecting the first link and the second link is located at the front end of the second slide.

10. The trolley according to claim 8, characterized in that: The seat includes a seat plate and a connecting portion extending downward from the side of the seat plate. The trolley frame also includes a sliding member rotatably connected to the upper part of the front support. The sliding member is slidably disposed inside the connecting portion in a front-rear direction. A pivot shaft rotatably connected to the first link and the second link is slidably disposed outside the connecting portion in a front-rear direction. When the trolley is folded and unfolded, the sliding directions of the pivot shaft rotatably connected to the first link and the second link and the sliding member are opposite.

11. The trolley according to claim 3, characterized in that: The trolley also includes an electric drive mechanism for automatically folding and unfolding the trolley frame. The electric drive mechanism includes a transmission mechanism connected to the backrest and the rear support respectively, and a motor disposed on the rear support or the backrest for driving the transmission mechanism.

12. The trolley according to claim 3, characterized in that: The trolley frame also includes a push rod, which is rotatably connected to the seat. The push rod has a first working position and a second working position. When the push rod is in the first working position, it is close to the backrest, and the trolley is in a forward-facing use state. When the push rod is in the second working position, it is away from the backrest, and the trolley is in a reverse-facing use state.

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