Width-adjustable flat car

Abstract

The utility model discloses a width-adjustable flat car in the technical field of transportation devices. The width-adjustable flat car comprises a middle plate, the two adjusting plates cover the left side and the right side of the middle plate; the two supporting assemblies are arranged in parallel and located on the front side and the rear side of the middle plate. The supporting assembly comprises a supporting pipe arranged on the bottom face of the middle plate, two adjusting pipes located on the left side and the right side of the middle plate, two locking pieces installed at the two ends of the supporting pipe and two walking wheels rotationally installed at the ends, away from the supporting pipe, of the adjusting pipes in a one-to-one correspondence mode, wherein one ends of the two adjusting pipes are slidably connected into the supporting pipe in a sleeved mode, and the other ends of the two adjusting pipes are connected with the adjacent adjusting plates. Through the supporting assemblies on the front side and the rear side, the stable supporting effect is achieved, stress concentration is reduced, the structural strength is guaranteed, through cooperation of the supporting pipes and the adjusting pipes, the limiting and guiding effects are achieved, the adjusting plates and the middle plates can be guided to be overlapped or unfolded, then the width is adjusted, the project universality is high, and the application range is wide. The use limitation is small, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of transportation devices, in particular to a flatbed vehicle with adjustable width. Background Art

[0002] Three-dimensional poultry cage farming is a modern poultry farming method, usually used for the breeding of poultry such as chickens and ducks. It uses multi-layer or three-dimensional cages to save space and increase stocking density. In addition, a flatbed truck is arranged between two sets of adjacent cages. The flatbed truck can be used to load cleaning equipment, transport feed and water, and collect poultry products.

[0003] In addition, the flatbed truck also provides a convenient working platform, allowing breeders to step on the flatbed truck to observe and inspect the feeding conditions of poultry, thereby helping breeders to manage poultry more efficiently and keep the feeding environment clean and hygienic.

[0004] However, since the cage arrangement widths of each project are different, flatbed trucks of different specifications are required, which causes waste in production management, poor project versatility, and great limitations in use. Utility Model Content

[0005] The utility model aims to provide a flatbed truck with adjustable width, which solves the technical problems of poor versatility and great use limitations of the flatbed trucks in the prior art.

[0006] The utility model discloses a flatbed vehicle with adjustable width, comprising:

[0007] Middle plate;

[0008] Two adjustment plates, covering the left and right sides of the middle plate;

[0009] Two support assemblies are arranged in parallel and located at the front and rear sides of the middle plate;

[0010] The support assembly comprises:

[0011] A support pipe is provided on the bottom surface of the middle plate,

[0012] Two adjustment tubes are located on the left and right sides of the middle plate, and one end of the adjustment tubes is slidably sleeved in the support tube, and the other end is connected to the adjacent adjustment plate.

[0013] Two locking pieces are installed at both ends of the support tube to lock and fix the adjustment tube and the support tube.

[0014] Two walking wheels are rotatably mounted on one end of the adjusting tube away from the supporting tube in a one-to-one correspondence.

[0015] This application uses the support components on the front and rear sides to provide stable support, reduce stress concentration, and ensure structural strength. It also uses the cooperation of the support tube and the adjustment tube to play a limiting and guiding role, thereby guiding the adjustment plate and the middle plate to overlap or expand, and then adjust the width. The project has high versatility, few usage limitations, and is easy to operate.

[0016] On the basis of the above technical solution, the solution of this application can also be improved as follows:

[0017] Preferably, a socket is provided on the outer periphery of the end of the support tube, and a plurality of positioning holes arranged at intervals are provided on the adjustment tube along the axial direction; the locking piece is a latch that can pass through the socket and be inserted into any of the positioning holes; by adopting this solution, the locking and fixation between the support tube and the adjustment tube can be completed quickly and conveniently, and the operation is simple, the efficiency is high, and the structure is stable, thereby ensuring the use effect.

[0018] Preferably, the support assembly further comprises:

[0019] Two support sleeves, fixedly sleeved one by one on one end of the adjusting tube away from the supporting tube and connected to the adjacent adjusting plate;

[0020] Two supporting shafts are coaxially arranged one by one at one end of the supporting sleeve away from the adjusting tube, and the movable sleeve is provided with the walking wheel;

[0021] Two limit plates are installed one by one at the end of the support shaft away from the support sleeve; the adoption of this solution improves the structural stability, ensures the overall structural strength, facilitates manufacturing and assembly, and improves production efficiency.

[0022] Preferably, strips are provided on the front and rear sides of the adjustment plate, and the strips are arranged at an angle and cover the support sleeve and the support tube. This solution plays a guiding role, which is used to guide the top surface debris to slide to the side of the flatbed truck to avoid falling into the adjustment tube through the positioning hole, thereby improving the use effect of the device.

[0023] Preferably, a first crossbeam is provided on the bottom surface of one side of the adjustment plate away from the middle plate, and two ends of the first crossbeam are engaged and connected with the adjacent support sleeves;

[0024] A second cross beam is provided on the bottom surfaces of the left and right sides of the middle plate, and the two ends of the second cross beam are engaged and connected with the adjacent support tubes. By adopting this solution, the middle plate and the adjustment plate can be supported longitudinally, thereby improving the structural strength, enhancing the bearing capacity, reducing the concentration of local stress, and thus improving the stability and durability of the structure.

[0025] Preferably, the cross-sections of the first crossbeam and the second crossbeam are both L-shaped structures; by adopting this solution, pressure can be effectively withstood, and the bottom provides additional support area, which helps to evenly distribute the load and reduce stress concentration in the structure, and less material can be used under the same load conditions, thereby reducing costs and reducing the deadweight of the structure.

[0026] Preferably, limiting rings are fixed on both ends of the outer circumference of the walking wheels; with this solution, an annular groove is formed, so that the walking wheels on the left and right sides can engage with the outer edge of the trough, so that the flatbed cart is supported on the two troughs and will not come off due to shaking left and right, thereby ensuring the stability of the support.

[0027] Preferably, it also includes:

[0028] Two foot brake assemblies are symmetrically installed on the top surface of the adjustment plate to automatically limit the rotation of the walking wheels. By adopting this solution, the rotation of the front and rear walking wheels can be limited, thereby fully eliminating the risk of automatic movement during use, ensuring stability when stopping, avoiding people from falling and getting injured, and improving the safety of equipment use.

[0029] Preferably, a plurality of evenly distributed limiting slots are provided on the outer circumference of the limiting ring; and the foot brake assembly comprises:

[0030] A bracket, mounted on the top surface of the adjustment plate;

[0031] A pedal, the middle of the bottom of which is hinged to the bracket;

[0032] A card plate is provided at one end of the pedal close to the running wheel and extends transversely to the top of the running wheel;

[0033] The spring has one end connected to the card plate and the other end connected to the bracket; the present invention can stably complete the automatic locking operation, and has a simple structure, convenient operation, low production and assembly difficulty, and is convenient for actual production and application.

[0034] Through the above technical solution, the utility model achieves the following beneficial effects:

[0035] 1. The present application plays a role of stable support through the support components on the front and rear sides, reduces stress concentration, and ensures structural strength. It also plays a role of limiting guidance through the cooperation of the support tube and the adjustment tube, so as to guide the adjustment plate and the middle plate to overlap or expand, thereby adjusting the width. It has high project versatility, small usage limitations, and easy operation;

[0036] 2. The present application can limit the rotation of the front and rear walking wheels by stepping on the foot brake assembly separately, thereby fully eliminating the risk of automatic movement during use, ensuring stability when stopping, avoiding people from falling and getting injured, and improving the safety of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a structural schematic diagram of a width-adjustable flatbed truck according to a specific embodiment of the utility model;

[0039] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0040] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0041] Figure 4 for Figure 1 A schematic diagram of the structure of the width-adjustable flatbed truck shown in another perspective;

[0042] Figure 5 for Figure 1 A schematic diagram of the use of a flatbed truck with adjustable width is shown;

[0043] Description of reference numerals:

[0044] 1. Middle plate; 2. Adjustment plate; 3. Support assembly; 4. Foot brake assembly;

[0045] 11. Second crossbeam; 21. Strip; 22. First crossbeam; 31. Support tube; 32. Adjustment tube; 33. Locking piece; 34. Travel wheel; 35. Support sleeve; 36. Support shaft; 37. Limiting plate; 41. Bracket; 42. Pedal; 43. Card plate; 44. Spring;

[0046] 311, jack; 321, positioning hole; 341, limiting ring;

[0047] 3411, limit slot. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0049] First of all, it should be noted that in the following description, some directional words involved in order to clearly illustrate the technical solution of the utility model, such as "top surface", "bottom surface", etc., all have the meaning by analogy with the normal orientation of the parts in the width-adjustable flatbed truck. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the utility model.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0052] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0053] Example:

[0054] like Figure 1 As shown, an embodiment of the present application discloses a width-adjustable flatbed cart for providing a convenient working platform in three-dimensional poultry cages, and its specific structure includes: a middle plate 1, two adjustment plates 2 and two support assemblies 3.

[0055] The middle plate 1 is in a rectangular structure, which improves the structural regularity.

[0056] Two adjustment plates 2 cover the left and right sides of the middle plate 1; the adjustment plates 2 are rectangular in structure, and the length is consistent with that of the middle plate 1, so that the front and rear sides of the two are aligned, thereby improving the structural regularity.

[0057] The two support assemblies 3 are arranged in parallel and are located at the front and rear sides of the middle plate 1 .

[0058] Specifically, Figure 1 and Figure 2 As shown, each support assembly 3 includes: a support tube 31 , two adjustment tubes 32 , two locking pieces 33 and two travel wheels 34 .

[0059] The support tube 31 is disposed on the bottom surface of the middle plate 1 ; the support tube 31 is specifically located at the bottom edge of the middle plate 1 , so that it is convenient for the operator to adjust the locking piece 33 , thereby improving the use effect.

[0060] The two adjustment tubes 32 are located on the left and right sides of the middle plate 1, and one end is slidably sleeved in the support tube 31, and the other end is connected to the adjacent adjustment plate 2; the adjustment tube 32 is specifically connected to the side of the adjustment plate 2 away from the middle plate 1, thereby increasing the width adjustment range and ensuring the use effect.

[0061] Two locking pieces 33 are installed at both ends of the support tube 31 to lock and fix the adjustment tube 32 and the support tube 31; the locking piece 33 can be a fastening bolt, a clamp or a pin, but is not limited to this. As long as the support tube 31 and the adjustment tube 32 can be locked and fixed, no specific limitation is made.

[0062] The two running wheels 34 are rotatably mounted on one end of the adjusting tube 32 away from the supporting tube 31 in a one-to-one correspondence; the rotating shaft of the running wheel 34 is coaxially arranged with the adjusting tube 32, thereby improving the movement stability.

[0063] When adjusting the width, the adjustment plate 2 can be driven to move left and right, so that in the front and rear support components 3, the adjustment tube 32 can be extended and retracted in the support tube 31; when the width is adjusted to a suitable size, the support tube 31 and the adjustment tube 32 are locked and fixed by the locking piece 33 to keep the device structurally stable.

[0064] The utility model plays a role of stable support through the support components 3 on the front and rear sides, reduces stress concentration, and ensures structural strength. It also plays a role of limiting guidance through the cooperation of the support tube 31 and the adjustment tube 32, so as to guide the adjustment plate 2 and the middle plate 1 to overlap or expand, thereby adjusting the width. The utility model has high project versatility, small usage limitations, and easy operation.

[0065] In some embodiments, Figure 2 As shown, a plug hole 311 is provided on the outer periphery of the end of the support tube 31 , and a plurality of positioning holes 321 arranged at intervals are provided on the adjustment tube 32 along the axial direction; the locking member 33 is a latch pin that can pass through the plug hole 311 and be inserted into any positioning hole 321 .

[0066] Preferably, the insertion hole 311 and the positioning hole 321 are specifically provided on the outside of the support tube 31 and the adjustment tube 32 , so that the locking piece 33 can be inserted horizontally, which is convenient for user operation and use.

[0067] When locking, the support tube 31 and the adjustment tube 32 are adjusted so that the insertion hole 311 is aligned with a positioning hole 321, and then the locking piece 33 is passed through the insertion hole 311 and inserted into the corresponding positioning hole 321; thus, the support tube 31 and the adjustment tube 32 are axially limited and can no longer be telescopically adjusted.

[0068] Through the above arrangement, the locking and fixing between the support tube 31 and the adjustment tube 32 can be completed quickly and conveniently, and the operation is simple, the efficiency is high, and the structure is stable, thereby ensuring the use effect.

[0069] In some embodiments, Figure 3 and Figure 4 As shown, the support assembly 3 also includes:

[0070] Two support sleeves 35 are fixedly sleeved on one end of the adjustment tube 32 away from the support tube 31 in a one-to-one correspondence, and are connected to the adjacent adjustment plate 2; the support sleeves 35 are cylindrical, which improves the structural regularity.

[0071] Two support shafts 36 are coaxially arranged one by one at one end of the support sleeve 35 away from the adjustment tube 32, and the movable sleeve is provided with a running wheel 34; the end of the support shaft 36 is provided with a threaded hole for installing and fixing the limit plate 37.

[0072] Two limit plates 37 are installed one by one at the end of the support shaft 36 away from the support sleeve 35; the limit plate 37 is used to limit the walking wheel 34 from separating from the support shaft 36, has a disc-shaped structure, and is provided with a through hole, so that the bolt can pass through the through hole and be threadedly connected with the threaded hole, so that the limit plate 37 is installed on the end of the support sleeve 35, which is easy to disassemble and assemble, and the connection is firm, and the actual application effect is good.

[0073] Through the above arrangement, the structural stability is improved, the overall structural strength is guaranteed, the manufacturing and assembly are facilitated, and the production efficiency is improved.

[0074] Based on the above embodiments, Figure 2 As shown, strips 21 are provided on the front and rear sides of the adjustment plate 2 . The strips 21 are arranged obliquely and cover the support sleeve 35 and the support tube 31 .

[0075] Specifically, the strip plate 21 plays a guiding role, and is used to guide the debris on the top surface to slide to the side of the flatbed truck, so as to avoid falling into the adjustment tube 32 through the positioning hole 321, thereby improving the use effect of the device.

[0076] Based on the above embodiments, Figure 4As shown, a first cross beam 22 is provided on the bottom surface of the adjustment plate 2 away from the middle plate 1, and both ends of the first cross beam 22 are snap-connected with the adjacent support sleeve 35; second cross beams 11 are provided on the left and right bottom surfaces of the middle plate 1, and both ends of the second cross beam 11 are snap-connected with the adjacent support tube 31.

[0077] Exemplarily, both ends of the first crossbeam 22 and the second crossbeam 11 are provided with slots to achieve snap connection with the support tube 31 and the support sleeve 35, and the connection area is welded to ensure a stable connection.

[0078] By setting the second cross beam 11 and the first cross beam 22 as mentioned above, the middle plate 1 and the adjustment plate 2 can be supported longitudinally, thereby improving the structural strength, enhancing the bearing capacity, reducing the concentration of local stress, and thus improving the stability and durability of the structure.

[0079] Preferably, if Figure 4 As shown, the cross-sections of the first crossbeam 22 and the second crossbeam 11 are both L-shaped structures; the two sides of the L-shaped structure can effectively withstand pressure, and the bottom provides additional support area, which helps to evenly distribute the load and reduce stress concentration in the structure; and less material can be used under the same load conditions, thereby reducing costs and reducing the deadweight of the structure.

[0080] In some embodiments, Figure 1 and Figure 5 As shown, the two ends of the outer periphery of the travel wheel 34 are fixedly sleeved with limit rings 341; an annular groove is formed between the two limit rings 341, such as Figure 5 As shown, the running wheels 34 on the left and right sides can engage with the outer edge of the trough, so that the flatbed cart is supported on the two troughs and will not come off due to shaking left and right, thereby ensuring the stability of the support.

[0081] Based on the above embodiments, Figure 1 As shown, it also includes: two foot brake assemblies 4, which are symmetrically installed on the top surface of an adjustment plate 2 and are used to automatically limit the rotation of the walking wheel 34.

[0082] During inspection, the breeder steps on the foot brake assembly 4 with both feet, so that the breeder can move in parallel. When the breeder moves to a suitable position, both feet leave the foot brake assembly 4, so that the foot brake assembly 4 automatically limits the rotation of the walking wheel 34, thereby achieving automatic locking and ensuring the safety of the breeder.

[0083] Through the above arrangement, the rotation of the front and rear wheels 34 can be limited, thereby fully eliminating the risk of automatic movement during use, ensuring stability when stopped, avoiding people from falling and getting injured, and improving the safety of equipment use.

[0084] Specifically, Figure 3As shown, a plurality of evenly distributed limiting grooves 3411 are provided on the outer periphery of the limiting ring 341 ; the foot brake assembly 4 includes: a bracket 41 , a pedal 42 , a clamping plate 43 and a spring 44 .

[0085] The bracket 41 is mounted on the top surface of the adjustment plate 2; the bottom middle of the pedal 42 is hinged to the bracket 41; the clamping plate 43 is arranged at one end of the pedal 42 close to the running wheel 34, and extends horizontally to the top of the running wheel 34; one end of the spring 44 is connected to the clamping plate 43, and the other end is connected to the bracket 41;

[0086] Specifically, the bracket 41 has a concave structure with high structural stability and good supporting strength; the pedal 42 is hinged by a pin shaft and has high connection strength; the card plate 43 has an L-shaped structure with high structural strength, and is integrally formed with the pedal 42 for easy production and manufacturing; hook holes are provided on the card plate 43 and the bracket 41 to facilitate the installation and fixation of the spring 44.

[0087] During inspection, the breeder steps on the pedal 42, causing one end of the clamping plate 43 to rise up to overcome the force of the spring 44, so that the clamping plate 43 does not engage with the limiting clamping groove 3411, so that the walking wheel 34 can rotate freely, allowing the flatbed car to move parallel.

[0088] When stopping, the breeder no longer steps on the pedal 42, so under the pulling force of the spring 44, one end with the clamping plate 43 falls down, so that when the running wheel 34 rotates to the point where the limit clamping groove 3411 is aligned with the clamping plate 43, the two can be engaged, so that the running wheel 34 is locked and can no longer rotate.

[0089] Through the above arrangement, the automatic locking operation can be stably completed, and the structure is simple, the operation is convenient, the production and assembly difficulty is small, and it is convenient for actual production application.

[0090] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A flatbed truck with adjustable width, characterized in that: include: Middle plate (1); Two adjustment plates (2) covering the left and right sides of the middle plate (1); Two support assemblies (3) are arranged in parallel and are located on the front and rear sides of the middle plate (1); The support assembly (3) comprises: A support tube (31) is provided on the bottom surface of the middle plate (1). Two adjustment tubes (32) are located on the left and right sides of the middle plate (1), and one end of the two adjustment tubes is slidably sleeved in the support tube (31), and the other end is connected to the adjacent adjustment plate (2). Two locking pieces (33) are installed at both ends of the support tube (31) and are used to lock and fix the adjustment tube (32) and the support tube (31). The two walking wheels (34) are rotatably mounted on one end of the adjusting tube (32) away from the supporting tube (31) in a one-to-one correspondence.

2. The width-adjustable flatbed vehicle according to claim 1, characterized in that: An insertion hole (311) is provided on the outer periphery of the end of the support tube (31), and a plurality of positioning holes (321) arranged at intervals are provided on the adjustment tube (32) along the axial direction; the locking element (33) is a latch pin capable of passing through the insertion hole (311) and being inserted into any of the positioning holes (321).

3. The width-adjustable flatbed vehicle according to claim 1, characterized in that: The support assembly (3) further comprises: Two support sleeves (35), which are fixedly sleeved one by one on one end of the adjustment tube (32) away from the support tube (31) and connected to the adjacent adjustment plate (2); Two support shafts (36) are coaxially arranged one by one at one end of the support sleeve (35) away from the adjustment tube (32), and the movable sleeve is provided with the walking wheel (34); Two limit plates (37) are mounted in a one-to-one correspondence on one end of the support shaft (36) away from the support sleeve (35).

4. The width-adjustable flatbed vehicle according to claim 3, characterized in that: Strip plates (21) are provided on both the front and rear sides of the adjustment plate (2); the strip plates (21) are arranged at an angle and cover the support sleeve (35) and the support tube (31).

5. The width-adjustable flatbed vehicle according to claim 3, characterized in that: A first crossbeam (22) is provided on the bottom surface of one side of the adjustment plate (2) away from the middle plate (1), and two ends of the first crossbeam (22) are snap-fitted and connected to the adjacent support sleeve (35); Second cross beams (11) are provided on the bottom surfaces of the left and right sides of the middle plate (1), and both ends of the second cross beam (11) are snap-fitted and connected to the adjacent support tubes (31).

6. The width-adjustable flatbed vehicle according to claim 5, characterized in that: The cross-sections of the first cross-beam (22) and the second cross-beam (11) are both L-shaped structures.

7. The width-adjustable flatbed vehicle according to claim 1, characterized in that: Limiting rings (341) are fixedly sleeved at both ends of the outer circumference of the traveling wheel (34).

8. The width-adjustable flatbed vehicle according to claim 7, characterized in that: Also includes: Two foot brake assemblies (4) are symmetrically mounted on the top surface of one of the adjustment plates (2) and are used to automatically limit the rotation of the walking wheels (34).

9. The width-adjustable flatbed vehicle according to claim 8, characterized in that: The outer circumference of the limiting ring (341) is provided with a plurality of evenly distributed limiting grooves (3411); The foot brake assembly (4) comprises: A bracket (41) mounted on the top surface of the adjustment plate (2); A pedal (42) hingedly connected to the bracket (41) at the middle of the bottom; A clamping plate (43) is arranged at one end of the pedal (42) close to the running wheel (34) and extends transversely to above the running wheel (34); A spring (44) has one end connected to the clamping plate (43) and the other end connected to the bracket (41).

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