Flat car

By designing a pedal structure in the flatbed car, users can lift the front of the flatbed car through the pedal part, solving the problem of easy damage to the handle bar in the prior art, and improving the strength and user experience of the cargo plate.

CN222793523UActive Publication Date: 2025-04-25ZHONGSHAN FUMEISEN DAILY PROD CO LTD
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Patent Information

Application Number
CN202421352834.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-14
Publication Date
2025-04-25
Estimated Expiration
2034-06-14

AI Technical Summary

Technical Problem

When existing flatbed cars encounter thresholds or obstacles, they need to press down the car by acting on the handle bar to lift the other end, resulting in the handle bar being easily deformed and damaged, which makes the user experience poor.

Method used

A flatbed truck including a cargo plate and a pedal structure is designed. The lower part of the cargo plate is equipped with an installation groove structure. The pedal structure consists of a support part and a pedal part. The support part extends into the installation groove structure. The pedal part can be used by the user and lifts the front part of the flatbed truck through the pedal part.

Benefits of technology

Through the design of the pedal structure, the excessive use of the handle bar is avoided, the risk of damage to the handle bar is reduced, the user experience is improved, and the strength of the cargo plate is improved through the strengthening effect of the support part.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a flat car. The flat car comprises a cargo carrying plate, the cargo carrying plate comprises a plate body and a mounting groove structure arranged on the lower portion of the plate body, and the mounting groove structure is formed in the front-back direction of the plate body; and the treading structure comprises a supporting part and a treading part which are connected with each other, the supporting part extends into the mounting groove structure, and the treading part extends out of the rear side of the cargo carrying plate. According to the flat car provided by the utility model, on one hand, the treading part can serve as a pedal for a user to use, and the user can step down the treading part so as to lift up the front part of the flat car; and on the other hand, the supporting parts located in the mounting groove structures can play a role in reinforcing the plate body, and the strength of the cargo carrying plate is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of freight carts, in particular to a flatbed cart. Background Art

[0002] As a small freight trolley, a flatbed trolley is used in many occasions. During use, the flatbed trolley is prone to encounter obstacles such as thresholds. At this time, the user needs to press down one end of the flatbed trolley first to lift the other end of the flatbed trolley, so that the front wheel passes the obstacle first, and then lift the rear wheel, so that the flatbed trolley as a whole passes the obstacle. The user generally presses down the flatbed trolley by acting on the handle bar, which will cause the handle bar to deform easily over time, causing damage, and this method is not conducive to the user's strength, and the user's experience is poor.

[0003] Therefore, a flatbed vehicle is needed to solve the above problems. Utility Model Content

[0004] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a flatbed truck. On the one hand, the pedal portion can be used as a pedal for the user, and the user can lift the front of the flatbed truck by stepping down the pedal portion; on the other hand, the support portion located in the mounting groove structure can strengthen the board body and improve the strength of the cargo board.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A flatbed vehicle, comprising:

[0007] A cargo board, comprising a board body and a mounting groove structure arranged at the lower part of the board body, wherein the mounting groove structure is opened along the front-rear direction of the board body;

[0008] The pedal structure comprises a supporting portion and a pedal portion which are connected to each other, wherein the supporting portion extends into the mounting groove structure, and the pedal portion extends out from the rear side of the cargo board.

[0009] Optionally, the support portion can slide along the mounting slot structure so that the tread portion can move between a retracted position close to the rear side of the board body and an extended position away from the rear side of the board body.

[0010] Optionally, when the pedal portion is located in the extended position, the pedal portion is located behind the board body and has a first gap with the board body; when the pedal portion is located in the contracted position, the pedal portion is located behind the board body and has a second gap with the board body, and the first gap is larger than the second gap.

[0011] Optionally, the support portion extends from a front end of the plate body to a rear end of the plate body.

[0012] Optionally, the mounting groove structure includes a first slide groove and a second slide groove which are relatively arranged on the left and right sides of the plate body and are parallel to each other, the support part includes a first support part and a second support part which are spaced apart and parallel to each other, one end of the treading part is connected to the rear end of the first support part, and the other end of the treading part is connected to the rear end of the second support part, the first support part extends into the first slide groove and can slide along the first slide groove, and the second support part extends into the second slide groove and can slide along the second slide groove.

[0013] Optionally, the pedal structure further includes two arc-shaped connecting parts, one end of the pedal part is connected to the rear end of the first support part through one of the arc-shaped connecting parts, and the other end of the pedal part is connected to the rear end of the second support part through another of the arc-shaped connecting parts.

[0014] The cam body has a first end for receiving the first and second end portions of the second cam body, the second end for receiving the first and second cam body being provided with a plurality of roller structures installed on the lower side of the plate body, the roller structure comprising a mounting plate and a roller body installed on the mounting plate, the lower side of the plate body being provided with a first slide slot plate and a second slide slot plate arranged in parallel with each other, the first slide slot plate and the second slide slot plate being spaced apart to form a first groove, the mounting plate of at least one roller structure being mounted on the plate body and located at the lower side of the first groove, the plate body, the mounting plate, the first slide slot plate and the second slide slot plate being spaced apart to form the first slide slot, the lower side of the plate body being provided with a third slide slot plate and a fourth slide slot plate being spaced apart to form a second groove, the mounting plate, the plate body, the third slide slot plate and the fourth slide slot plate being spaced apart to form the second slide slot.

[0015] Optionally, a first slide groove reinforcement plate and a second slide groove reinforcement plate are further provided at the left portion of the lower side of the plate body, the first slide groove reinforcement plate is located at the rear end of the first groove and is connected to the lower side of the first slide groove plate and the lower side of the second slide groove plate, the second slide groove reinforcement plate is located at the front end of the first groove and is connected to the lower side of the first slide groove plate and the lower side of the second slide groove plate; and or

[0016] A third slide groove reinforcement plate and a fourth slide groove reinforcement plate are also provided on the right part of the lower side of the plate body. The third slide groove reinforcement plate is located at the rear end of the second groove and is connected to the lower side of the third slide groove plate and the lower side of the fourth slide groove plate. The fourth slide groove reinforcement plate is located at the front end of the second groove and is connected to the lower side of the third slide groove plate and the lower side of the fourth slide groove plate.

[0017] Optionally, a connecting column hole is provided on the lower side of the plate body, the left and right sides of the first groove and the left and right sides of the second groove are provided with the connecting column holes, and the mounting plate is mounted on the connecting column holes.

[0018] Optionally, a limiting structure is provided between the mounting slot structure and the supporting portion, and the limiting structure is used to limit a sliding range of the supporting portion relative to the mounting slot structure.

[0019] Optionally, the limiting structure includes a limiting hole opened on the mounting slot structure, a first limiting spring sheet and a second limiting spring sheet installed in the supporting part, the first limiting spring sheet includes a first spring sheet body and a first limiting protrusion corresponding to the limiting hole, the first limiting protrusion is arranged on the first spring sheet body and extends out of the supporting part, when the pedal part is in the extended position, the first limiting protrusion falls into the limiting hole, the second limiting spring sheet includes a second spring sheet body and a second limiting protrusion corresponding to the limiting hole, the second limiting protrusion is arranged on the second spring sheet body and extends out of the supporting part, when the pedal part is in the retracted position, the second limiting protrusion falls into the limiting hole.

[0020] Compared with the prior art, the utility model has at least the following beneficial effects:

[0021] The flatbed truck provided by the utility model includes a cargo board and a pedal structure. The cargo board includes a board body and a mounting groove structure arranged at the lower part of the board body, and the mounting groove structure is opened along the front-to-back direction of the board body. The pedal structure includes a supporting portion and a pedal portion that are connected to each other, the supporting portion extends into the mounting groove structure, and the pedal portion extends out of the rear side of the cargo board. The pedal portion can be used as a pedal for the user, and the user can lift the front part of the flatbed truck by stepping down the pedal portion to cross obstacles or objects such as thresholds to facilitate the movement of the flatbed truck. Compared with the prior art method of lifting the front part of the flatbed truck by acting on the handrail rod installed at the rear end of the cargo board, the problem of damage to the handrail rod due to excessive force can be avoided. On the other hand, the supporting portion located in the mounting groove structure can play a role in reinforcing the board body and improving the strength of the cargo board. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is one of the three-dimensional structural schematic diagrams of the flatbed vehicle provided in the first specific embodiment of the utility model (the pedal part is in the extended position);

[0023] Figure 2 This is the second three-dimensional structural schematic diagram of the flatbed vehicle provided in the first specific embodiment of the utility model (the pedal part is located in the retracted position);

[0024] Figure 3 This is the third three-dimensional structural schematic diagram of the flatbed vehicle provided in the first specific embodiment of the utility model (the pedal part is in the extended position);

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the pedal structure of the flatbed vehicle provided in the first specific embodiment of the utility model;

[0026] Figure 5 It is a three-dimensional structural schematic diagram of a cargo plate of a flatbed truck provided in a specific embodiment 1 of the utility model;

[0027] Figure 6 It is a schematic diagram of the assembly of the cargo board and the pedal structure of the flatbed truck provided in the first specific embodiment of the utility model (the pedal part is in the extended position);

[0028] Figure 7 yes Figure 6 Sectional view at AA in the middle;

[0029] Figure 8 It is a three-dimensional structural schematic diagram of a flatbed vehicle provided in the second specific embodiment of the present utility model.

[0030] In the figure:

[0031] 1. Cargo board; 11. Board body; 121. First slide plate; 122. Second slide plate; 123. Third slide plate; 124. Fourth slide plate; 131. First slide reinforcement plate; 132. Second slide reinforcement plate; 133. Third slide reinforcement plate; 134. Fourth slide reinforcement plate; 14. Connecting column hole;

[0032] 2. pedal structure; 21. support portion; 211. first support portion; 212. second support portion; 22. pedal portion; 23. arc-shaped connecting portion;

[0033] 3. Roller structure; 31. Mounting plate; 32. Roller body;

[0034] 4. Handrails;

[0035] 5. First limiting spring piece; 51. First spring piece body; 52. First limiting protrusion;

[0036] 6. Second limiting spring piece; 61. Second spring piece body; 62. Second limiting protrusion;

[0037] 100, limiting hole; 101, first groove; 102, second groove; 201, first gap; 202, second gap. DETAILED DESCRIPTION

[0038] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0039] Embodiment 1

[0040] Please refer to Figure 1 The utility model provides a flatbed truck, including a cargo board 1 and a stepping structure 2. The cargo board 1 includes a board body 11 and a mounting groove structure arranged at the lower part of the board body 11, and the mounting groove structure is opened along the front-rear direction of the board body 11. The stepping structure 2 includes a supporting portion 21 and a stepping portion 22 connected to each other, the supporting portion 21 extends into the mounting groove structure, and the stepping portion 22 extends out of the rear side of the cargo board 1. When the stepping portion 22 is extended, it can be used as a pedal for the user. The user can lift the front of the flatbed truck by stepping on the stepping portion 22 to cross obstacles or objects such as thresholds, so as to facilitate the movement of the flatbed truck. Compared with the prior art method of lifting the front of the flatbed truck by acting on the handrail 4 installed at the rear end of the cargo board 1, the problem of damage to the handrail 4 due to excessive force can be avoided. On the other hand, the supporting portion 21 located in the mounting groove structure can play a reinforcing role on the board body 11 and improve the strength of the cargo board 1.

[0041] Optionally, the support portion 21 extends from the front end of the board body 11 to the rear end of the board body 11 to further enhance the reinforcement effect of the cargo board 1 .

[0042] Optionally, the support portion can slide along the mounting groove structure so that the pedal portion 22 can move between a retracted position close to the rear side of the board body 11 and an extended position away from the rear side of the board body 11, so as to achieve a telescopic effect of the pedal relative to the board body 11. Since the pedal structure 2 provided by the utility model can be telescopic, the pedal structure 2 can be pulled out when needed to achieve the pedal function and also extend the length of the board body 11, so as to transport longer objects. When not in use, at least a portion of the pedal structure 2 can be pushed into the lower side of the board body 11 to avoid the pedal structure 2 being extended to prevent the user from using the flatbed cart (for example, when the flatbed cart is being pulled, the extended pedal portion 22 is likely to press the user's heel, affecting the user's use).

[0043] Optionally, when the pedal portion 22 is in the extended position, the pedal portion 22 is located behind the board body 11 and has a first gap 201 between it and the board body 11; when the pedal portion 22 is in the contracted position, the pedal portion 22 is located behind the board body 11 and has a second gap 202 between it and the board body 11, and the first gap 201 is larger than the second gap 202. By setting the second gap 202, the user can pull out the pedal structure 2 by inserting the toes or heels into the second gap 202.

[0044] Optionally, the mounting groove structure includes a first slide groove and a second slide groove which are relatively arranged on the left and right sides of the board body 11 and are arranged parallel to each other, the support portion 21 includes a first support portion 211 and a second support portion 212 which are arranged at intervals and in parallel, one end of the treading portion 22 is connected to the rear end of the first support portion 211, and the other end of the treading portion 22 is connected to the rear end of the second support portion 212, the first support portion 211 extends into the first slide groove and can slide along the first slide groove, and the second support portion 212 extends into the second slide groove and can slide along the second slide groove. By providing the first slide groove, the second slide groove, and the first support portion 211 corresponding to the first slide groove and the second support portion 212 corresponding to the second slide groove, on the one hand, the structural strength of the telescopic treading portion 22 is improved, and on the other hand, the strength of the cargo board 1 can be further improved.

[0045] Optionally, the pedal structure 2 further includes two arc-shaped connecting parts 23, one end of the pedal part 22 is connected to the rear end of the first support part 211 through one arc-shaped connecting part 23, and the other end of the pedal part 22 is connected to the rear end of the second support part 212 through another arc-shaped connecting part 23. By providing the arc-shaped connecting part 23, a right angle corner is avoided at the connection between the pedal part 22 and the first support part 211 and the second support part 212, thereby avoiding the right angle corner from injuring the user or damaging other objects.

[0046] Optionally, it also includes multiple roller structures 3 installed on the lower side of the plate body 11, the roller structure 3 includes a mounting plate 31 and a roller body 32 installed on the mounting plate 31, and the right part of the lower side of the plate body 11 is provided with a first slide plate 121 and a second slide plate 122 arranged in parallel with each other, and the first slide plate 121 and the second slide plate 122 are spaced apart to form a first groove 101, and at least one mounting plate 31 of the roller structure 3 is installed on the plate body 11 and is located on the lower side of the first groove 101, and the plate body 11, the mounting plate 31, the first slide plate 121 and the second slide plate 122 are enclosed to form a first slide groove, and the mounting plate 31 of the roller structure 3 is used to cooperate with the plate body 11, the first slide groove plate 121 and the second slide groove plate 122 to form the first slide groove, and the structure is simple. A third slide plate 123 and a fourth slide plate 124 are arranged parallel to each other on the left portion of the lower side of the plate body 11, and a second groove 102 is formed between the third slide plate 123 and the fourth slide plate 124. At least one mounting plate 31 of a roller structure 3 is mounted on the plate body 11 and is located on the lower side of the second groove 102. The mounting plate 31, the plate body 11, the third slide plate 123 and the fourth slide plate 124 are combined to form a second slide groove. The second slide groove is formed by cooperating with the plate body 11, the third slide plate 123 and the fourth slide plate 124 of the roller structure 3, and the structure is simple.

[0047] Optionally, a first slide groove reinforcement plate 131 and a second slide groove reinforcement plate 132 are further provided at the left portion of the lower side of the plate body 11. The first slide groove reinforcement plate 131 is located at the rear end of the first groove 101 and is connected to the lower side of the first slide groove plate 121 and the lower side of the second slide groove plate 122. The second slide groove reinforcement plate 132 is located at the front end of the first groove 101 and is connected to the lower side of the first slide groove plate 121 and the lower side of the second slide groove plate 122. The first slide groove reinforcement plate 131 and the second slide groove reinforcement plate 132 are provided to improve the strength of the first slide groove and the supporting effect on the first support portion 211. The right part of the lower side of the plate body 11 is also provided with a third slide groove reinforcement plate 133 and a fourth slide groove reinforcement plate 134. The third slide groove reinforcement plate 133 is located at the rear end of the second groove 102 and is connected to the lower side of the third slide groove plate 123 and the lower side of the fourth slide groove plate 124. The fourth slide groove reinforcement plate 134 is located at the front end of the second groove 102 and is connected to the lower side of the third slide groove plate 123 and the lower side of the fourth slide groove plate 124. The third slide groove reinforcement plate 133 and the fourth slide groove reinforcement plate 134 are provided to improve the strength of the second slide groove and the supporting effect on the second support portion 212.

[0048] Optionally, a connecting column hole 14 is provided on the lower side of the plate body 11 , and connecting column holes 14 are provided on both the left and right sides of the first groove 101 and the left and right sides of the second groove 102 . The mounting plate 31 is mounted on the connecting column holes 14 , and the structure is simple.

[0049] Optionally, a limiting structure is provided between the mounting slot structure and the support portion 21 , and the limiting structure is used to limit the sliding range of the support portion 21 relative to the mounting slot structure to prevent the support portion 21 from sliding out of the mounting slot structure.

[0050] Optionally, the limiting structure includes a limiting hole 100 opened on the mounting slot structure, a first limiting spring sheet and a second limiting spring sheet installed in the support portion 21, the first limiting spring sheet 5 includes a first limiting spring sheet body 51 and a first limiting protrusion 52 corresponding to the limiting hole 100, the first limiting protrusion 52 is arranged on the first limiting spring sheet body 51 and extends out of the support portion 21, when the pedal portion 22 is in the extended position, the first limiting protrusion 52 falls into the limiting hole 100 under the action of the elastic force of the first limiting spring sheet body 51, and the user presses the first limiting spring sheet to make the first limiting spring sheet fall out of the limiting hole 100, and then the pedal structure 2 can be retracted. The second limiting spring piece includes a second limiting spring piece body 61 and a second limiting protrusion 62 corresponding to the limiting hole 100. The second limiting protrusion 62 is arranged on the second limiting spring piece body 61 and extends out of the outside of the supporting portion 21. When the pedal portion 22 is in the retracted position, the second limiting protrusion 62 falls into the limiting hole 100 under the action of the elastic force of the second limiting spring piece body 61. The user presses the second limiting spring piece to make the second limiting spring piece fall out of the limiting hole 100, and then the pedal structure 2 can be pulled out.

[0051] Furthermore, a limiting structure is disposed in both the first supporting portion 211 and the second supporting portion 212 to ensure the positioning stability of the left and right sides of the pedal structure 2 .

[0052] Optionally, the limiting holes 100 are provided on the first slide groove reinforcement plate 131 and the third slide groove reinforcement plate 133 , so as to facilitate the user to press the first limiting protrusion 52 and the second limiting protrusion 62 .

[0053] Embodiment 2

[0054] Please refer to Figure 8 The difference between the second embodiment and the first embodiment is that the pedal structure 2 in the second embodiment is not provided with an arc-shaped connecting portion 23, so that the structure of the pedal structure 2 is simpler.

[0055] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A flatbed vehicle, characterized in that: include: A cargo board (1) comprises a board body (11) and a mounting groove structure arranged at the lower part of the board body (11), wherein the mounting groove structure is opened along the front-rear direction of the board body (11); The pedal structure (2) comprises a supporting portion (21) and a pedal portion (22) which are connected to each other, wherein the supporting portion (21) extends into the mounting groove structure, and the pedal portion (22) extends out from the rear side of the cargo board (1).

2. The flatbed vehicle according to claim 1, characterized in that: The support portion (21) can slide along the mounting groove structure so that the tread portion (22) can move between a retracted position close to the rear side of the board body (11) and an extended position away from the rear side of the board body (11).

3. The flatbed vehicle according to claim 2, characterized in that: When the pedal portion (22) is located in the extended position, the pedal portion (22) is located behind the board body (11) and has a first gap (201) with the board body (11); when the pedal portion (22) is located in the retracted position, the pedal portion (22) is located behind the board body (11) and has a second gap (202) with the board body (11), and the first gap (201) is larger than the second gap (202).

4. The flatbed vehicle according to claim 1, characterized in that: The support portion (21) extends from the front end of the plate body (11) to the rear end of the plate body (11).

5. The flatbed vehicle according to claim 2, characterized in that: The mounting groove structure comprises a first slide groove and a second slide groove which are arranged on the left and right sides of the plate body (11) and are arranged parallel to each other. The support portion (21) comprises a first support portion (211) and a second support portion (212) which are arranged at intervals and in parallel. One end of the treading portion (22) is connected to the rear end of the first support portion (211), and the other end of the treading portion (22) is connected to the rear end of the second support portion (212). The first support portion (211) extends into the first slide groove and can slide along the first slide groove. The second support portion (212) extends into the second slide groove and can slide along the second slide groove.

6. The flatbed vehicle according to claim 5, characterized in that: The pedal structure (2) further comprises two arc-shaped connecting parts (23), one end of the pedal part (22) being connected to the rear end of the first supporting part (211) via one of the arc-shaped connecting parts (23), and the other end of the pedal part (22) being connected to the rear end of the second supporting part (212) via another of the arc-shaped connecting parts (23).

7. The flatbed vehicle according to claim 5, characterized in that: The invention also comprises a plurality of roller structures (3) mounted on the lower side of the plate body (11), wherein the roller structures (3) comprise a mounting plate (31) and a roller body (32) mounted on the mounting plate (31); a first slide groove plate (121) and a second slide groove plate (122) arranged in parallel with each other are arranged on the right part of the lower side of the plate body (11); a first groove plate (121) and a second groove plate (122) are arranged at intervals to form a first groove (101); the mounting plate (31) of at least one roller structure (3) is mounted on the plate body (11) and is located on the lower side of the first groove (101); the plate body (11) and the mounting plate (31) are arranged on the lower side of the plate body (11); , the first slide plate (121) and the second slide plate (122) are enclosed to form the first slide groove, a third slide plate (123) and a fourth slide plate (124) are arranged in parallel with each other on the left part of the lower side of the plate body (11), a second groove (102) is formed between the third slide plate (123) and the fourth slide plate (124), at least one mounting plate (31) of the roller structure (3) is mounted on the plate body (11) and is located at the lower side of the second groove (102), and the mounting plate (31), the plate body (11), the third slide plate (123) and the fourth slide plate (124) are enclosed to form the second slide groove.

8. The flatbed vehicle according to claim 7, characterized in that: A first slide groove reinforcement plate (131) and a second slide groove reinforcement plate (132) are also provided at the left portion of the lower side of the plate body (11), wherein the first slide groove reinforcement plate (131) is located at the rear end of the first groove (101) and is connected to the lower side of the first slide groove plate (121) and the lower side of the second slide groove plate (122), and the second slide groove reinforcement plate (132) is located at the front end of the first groove (101) and is connected to the lower side of the first slide groove plate (121) and the lower side of the second slide groove plate (122); and or A third slide groove reinforcement plate (133) and a fourth slide groove reinforcement plate (134) are also provided on the right portion of the lower side of the plate body (11); the third slide groove reinforcement plate (133) is located at the rear end of the second groove (102) and is connected to the lower side of the third slide groove plate (123) and the lower side of the fourth slide groove plate (124); the fourth slide groove reinforcement plate (134) is located at the front end of the second groove (102) and is connected to the lower side of the third slide groove plate (123) and the lower side of the fourth slide groove plate (124).

9. The flatbed vehicle according to claim 7, characterized in that: A connecting column hole (14) is provided on the lower side of the plate body (11), the left and right sides of the first groove (101) and the left and right sides of the second groove (102) are both provided with the connecting column holes (14), and the mounting plate (31) is mounted on the connecting column holes (14).

10. The flatbed vehicle according to any one of claims 1 to 9, characterized in that: A limiting structure is provided between the installation slot structure and the support portion (21), the limiting structure being used to limit the sliding range of the support portion (21) relative to the installation slot structure.

11. The flatbed vehicle according to claim 10, characterized in that: The limiting structure comprises a limiting hole (100) provided on the mounting slot structure, a first limiting spring piece (5) and a second limiting spring piece (6) installed in the support portion (21), the first limiting spring piece (5) comprising a first spring piece body (51) and a first limiting protrusion (52) corresponding to the limiting hole (100), the first limiting protrusion (52) being arranged on the first spring piece body (51) and extending out of the support portion (21), and when the stepping portion (22) is located in the extending position When the pedal portion (22) is in the expanded position, the first limiting protrusion (52) falls into the limiting hole (100), the second limiting spring piece (6) comprises a second spring piece body (61) and a second limiting protrusion (62) corresponding to the limiting hole (100), the second limiting protrusion (62) is arranged on the second spring piece body (61) and extends out of the support portion (21), and when the pedal portion (22) is in the retracted position, the second limiting protrusion (62) falls into the limiting hole (100).