A vehicle-mounted folding pull-out ladder

Abstract

This utility model relates to a vehicle-mounted folding pull-out ladder, including a slide frame, a pull-out ladder body, and a limiting mechanism. The slide frame includes a rear crossbeam and two oppositely arranged transverse slide grooves, with the rear crossbeam connecting the two transverse slide grooves. The pull-out ladder body is disposed between the two transverse slide grooves and slidably connected to them. The pull-out ladder body includes an upper platform, with limiting protrusions on both sides of the upper platform, the limiting protrusions being positioned within the transverse slide grooves. By setting a limiting mechanism, this utility model effectively restricts the lateral and longitudinal movement of the pull-out ladder body, preventing swaying and displacement of the pull-out ladder during vehicle operation, greatly improving safety and stability during use.

Description

Technical Field

[0001] This utility model relates to the field of vehicle auxiliary equipment technology, specifically to a vehicle folding pull-out ladder. Background Technology

[0002] During vehicle use, especially for large vehicles such as trucks and construction vehicles, it is often necessary to perform operations such as maintenance and loading / unloading of goods on the top or higher parts of the vehicle. In such cases, auxiliary tools such as ladders are required.

[0003] Currently, most commonly used vehicle ladders are freestanding, requiring them to be carried separately and placed in a suitable location when needed. This type of freestanding ladder presents several inconveniences. Firstly, it takes up considerable space during transport and is prone to wobbling, affecting vehicle safety. Secondly, it requires manual handling and placement, which is cumbersome and can waste valuable time, especially in emergencies.

[0004] While existing vehicle-mounted ladders can connect to vehicles, they have some shortcomings in their structural design. During vehicle operation, the pull-out ladder is prone to shaking, which not only causes significant friction with the slide rails, damaging the ladder, making it inconvenient to pull out, and shortening its lifespan, but also generates considerable noise from the vehicle, affecting the driving environment and the surrounding environment. Utility Model Content

[0005] In view of the above problems, this utility model provides a vehicle-mounted folding pull-out ladder to solve the problem of the pull-out ladder shaking during vehicle operation.

[0006] To achieve the above objectives, the applicant provides a vehicle-mounted folding pull-out ladder, comprising a slide frame, a pull-out ladder body, and a limiting mechanism. The slide frame includes a rear crossbeam and two opposing transverse slide grooves, the rear crossbeam connecting the two transverse slide grooves. The pull-out ladder body is disposed between the two transverse slide grooves and slidably connected to them. The pull-out ladder body includes an upper platform, with limiting protrusions on both sides of the upper platform, the limiting protrusions being positioned within the transverse slide grooves. The limiting mechanism includes a transverse limiting component and a longitudinal limiting structure. The transverse limiting component is disposed on the slide frame and abuts against the limiting protrusions to restrict the lateral movement of the pull-out ladder body. The longitudinal limiting structure is disposed inside the transverse slide grooves and abuts against the upper surface of the upper platform to restrict the longitudinal movement of the pull-out ladder body.

[0007] Preferably, the lateral limiting assembly includes a bumper spring, a limiting block, a fixing block, and a limiting spring. The bumper spring is disposed on the side of the rear crossbeam opposite to the pull-out ladder body and abuts against the pull-out ladder body. The limiting block extends into the lateral slide groove and abuts against the limiting protrusion. The fixing block is fixedly disposed on the outside of the lateral slide groove. The two ends of the limiting spring are respectively connected to the fixing block and the limiting block.

[0008] Preferably, the lateral limiting component further includes an unlocking handle, which is horizontally positioned and rotatably connected to the limiting block.

[0009] Preferably, the end of the unlocking handle away from the rear crossbeam has an arc-shaped hook.

[0010] Preferably, the longitudinal limiting structure is a wedge-shaped spring sheet.

[0011] Preferably, it also includes a positioning detection unit, which includes a travel sensor and a travel switch. The travel sensor is disposed on the upper platform, and the travel switch is disposed on the outside of the transverse slide. The travel sensor pushes the travel switch, and the travel switch transmits a signal to the driver's cab.

[0012] Preferably, the pull-out ladder body further includes a support frame and multiple steps, the support frame being rotatably connected to the upper platform, and the multiple steps being evenly arranged on the support frame.

[0013] Preferably, both the upper platform and the pedal are provided with multiple through holes.

[0014] Preferably, pulleys are provided on both sides of the upper platform and the support frame.

[0015] The advantages of the above technical solution compared to existing technologies are as follows: By setting a limiting mechanism, this utility model effectively restricts the horizontal and vertical movement of the pull-out ladder body, avoiding swaying and displacement of the pull-out ladder during vehicle operation, thus greatly improving the safety and stability of use; the setting of a positioning detection unit allows operators to know whether the pull-out ladder body has been retracted into place without getting off the vehicle to check, saving operation time and improving work efficiency.

[0016] The above description of the utility model is merely an overview of the technical solution of this utility model. In order to enable those skilled in the art to better understand the technical solution of this utility model and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this utility model easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this utility model. Attached Figure Description

[0017] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the present invention and other related contents, and should not be considered as limitations on the present invention.

[0018] In the accompanying drawings of the instruction manual:

[0019] Figure 1 This is a schematic diagram of the vehicle-mounted folding pull-out ladder described in this example;

[0020] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0021] Figure 3 for Figure 1 Cross-sectional view in the middle BB direction;

[0022] Figure 4 for Figure 3 Enlarged view of part B in the middle;

[0023] Figure 5 This is a schematic diagram of the pull-out ladder body in a lateral limiting state as described in this embodiment;

[0024] Figure 6 This is a schematic diagram illustrating the release of the lateral limit state of the pull-out ladder body in this embodiment;

[0025] Figure 7 This is a schematic diagram of the positioning detection unit described in this embodiment;

[0026] Figure 8 This is a schematic diagram of the limiting block abutting against the limiting protrusion in this embodiment.

[0027] The reference numerals used in the above figures are explained as follows:

[0028] 1. Slide frame; 11. Rear crossbeam; 12. Transverse slide groove; 2. Pull-out ladder body; 21. Upper platform; 211. Limiting protrusion; 22. Support frame; 23. Step; 24. Pulley; 3. Limiting mechanism; 31. Transverse limiting component; 311. Collision spring; 312. Limiting block; 3121. Moving part; 3122. Fixed part; 3123. Front limiting block; 313. Fixed block; 314. Limiting spring; 315. Unlocking handle; 32. Longitudinal limiting structure; 4. Position detection unit; 41. Travel sensor; 42. Limit switch. Detailed Implementation

[0029] To illustrate in detail the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this utility model, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this utility model and are therefore intended to limit the scope of protection of this utility model.

[0030] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0031] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0032] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0033] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0034] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0035] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0036] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0037] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0038] Please see Figures 1 to 8, this embodiment provides a vehicle folding and retractable ladder, which includes a slideway frame 1, a retractable ladder body 2 and a limiting mechanism 3. The slideway frame 1 includes a rear cross beam 11 and two relatively arranged transverse chutes 12. The rear cross beam 11 connects the two transverse chutes 12. The retractable ladder body 2 is arranged between the two transverse chutes 12 and is slidably connected to the transverse chutes 12. The retractable ladder body 2 includes an upper platform 21, and limiting protrusions 211 are arranged on both sides of the upper platform 21. The limiting protrusions 211 are placed in the transverse chutes 12. The limiting mechanism 3 includes a transverse limiting component 31 and a longitudinal limiting structure 32. The transverse limiting component 31 is arranged on the slideway frame 1, and the transverse limiting component 31 abuts against the limiting protrusions 211 to limit the retractable ladder body 2 from moving horizontally. The longitudinal limiting structure 32 is arranged on the inner side of the transverse chute 12, and the longitudinal limiting structure 32 abuts against the upper surface of the upper platform 21 to limit the retractable ladder body 2 from moving longitudinally.

[0039] The slideway frame 1 is the basic support structure of the folding and retractable ladder. It is made of high-strength metal materials and is fixedly connected to the bottom of the vehicle superstructure to facilitate the storage of the retractable ladder. The transverse chute 12 is a long strip structure. The cross-sectional shape of the transverse chute 12 is in the shape of a "匚", with an opening on one side, and the openings of the two transverse chutes 12 are arranged opposite to each other. The two transverse chutes 12 are connected by the rear cross beam 11. The rear cross beam 11 is horizontally arranged, and the rear cross beam 11 is fixed to one end of the two transverse chutes 12 by welding or threaded connection.

[0040] The retractable ladder body 2 is made of metal materials. The retractable ladder body 2 can be pulled and retracted along the length direction of the transverse chute 12. Both sides of the retractable ladder body 2 are located in the transverse chute 12 and abut against the inner wall of the transverse chute 12, so that the transverse chute 12 can limit the retractable ladder body 2 horizontally (that is, in the horizontal direction perpendicular to the pulling direction). The limiting protrusions 211 arranged on the upper platform 21 are block structures, which are used to cooperate with the limiting mechanism 3 to limit the retractable ladder body 2 from moving horizontally (that is, in the horizontal direction parallel to the pulling direction).

[0041] The limiting mechanism 3 is used to limit the retractable ladder body 2 from moving horizontally and longitudinally, ensuring that the retractable ladder body 2 does not shake during vehicle driving. The transverse limiting component 31 is arranged on the slideway frame 1 and abuts against the limiting protrusions 211 on the upper platform 21 to limit the retractable ladder body 2 from moving horizontally (that is, in the horizontal direction parallel to the pulling direction); the longitudinal limiting structure 32 is arranged on the upper surface of the inner side of the transverse chute 12 and abuts against the upper surface of the upper platform 21, so as to give a downward pressure to the upper platform 21 to limit the retractable ladder body 2 from moving longitudinally.

[0042] Specifically, there are multiple lateral limiting components 31, and these components are symmetrically distributed. Each lateral limiting component 31 applies two opposing forces to the pull-out ladder body 2, thereby ensuring the pull-out ladder body 2 remains stable in the lateral direction and prevents movement. The combined action of multiple lateral limiting components 31 makes the lateral limiting of the pull-out ladder body 2 even more secure.

[0043] In this embodiment, there are two longitudinal limiting structures 32, which are respectively installed on the two transverse sliding grooves 12 and located at one end near the rear crossbeam 11. When the pull-out ladder body 2 is pushed into the rear crossbeam 11, the longitudinal limiting structure 32 abuts against the upper platform 21, and the longitudinal limiting structure 32 applies a downward force to the upper platform 21 to keep the pull-out ladder body 2 stable in the longitudinal direction and prevent shaking.

[0044] Specifically, the rear crossbeam 11 connects the two transverse sliding grooves 12 into a whole, providing a stable sliding track for the pull-out ladder body 2. The transverse limiting component 31 abuts against the limiting protrusion 211 of the upper platform 21 of the pull-out ladder body 2, restricting the movement of the pull-out ladder body 2 in the transverse direction (i.e., the horizontal direction parallel to the pulling direction) through the force between the two; the longitudinal limiting structure 32 abuts against the upper surface of the upper platform 21, using the abutment force to restrict the movement of the pull-out ladder body 2 in the longitudinal direction (i.e., the vertical direction). Through the dual limiting of the transverse and longitudinal directions, it is ensured that the pull-out ladder body 2 will not undergo unnecessary displacement during vehicle travel, reducing damage to the pull-out ladder and improving its service life.

[0045] Compared with the prior art, this embodiment effectively restricts the movement of the pull-out ladder body 2 in the horizontal and vertical directions by setting a limiting mechanism 3, avoiding swaying and displacement of the pull-out ladder during vehicle operation, and greatly improving the safety and stability of use.

[0046] Please see Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 8 In this embodiment, the lateral limiting component 31 includes a bump spring 311, a limiting block 312, a fixing block 313, and a limiting spring 314. The bump spring 311 is disposed on one side of the rear crossbeam 11 opposite to the pull-out ladder body 2, and the bump spring 311 abuts against the pull-out ladder body 2. The limiting block 312 extends into the lateral slide groove 12 and abuts against the limiting protrusion 211. The fixing block 313 is fixedly disposed on the outside of the lateral slide groove 12. The two ends of the limiting spring 314 are respectively connected to the fixing block 313 and the limiting block 312.

[0047] The contact spring 311 is an elastic component located on one side of the rear crossbeam 11 opposite to the pull-out ladder body 2. In this embodiment, there are two contact springs 311, symmetrically arranged at both ends of the rear crossbeam 11, to enhance the force applied to the pull-out ladder body 2 and ensure that the pull-out ladder body 2 is evenly stressed. When the pull-out ladder body 2 is retracted or in a specific position, the two contact springs 311 abut against the upper platform 21 on the pull-out ladder body 2, generating elastic force through their own elastic deformation, and continuously exerting a force on the upper platform 21 in the pulling direction of the pull-out ladder body 2.

[0048] The limiting block 312 is a block-shaped structure, including a fixed part 3122 and a movable part 3121. The fixed part 3122 is fixed to the outside of the transverse slide 12, and the movable part 3121 is hinged to the fixed part 3122. One end of the movable part 3121 is hook-shaped, and the hook shape faces away from the limiting protrusion 211. An opening is provided at a corresponding position in the transverse slide 12. The hook-shaped end of the movable part 3121 extends into the transverse slide 12 through the opening and can abut against the limiting protrusion 211 of the upper platform 21 of the pull-out ladder body 2.

[0049] The fixing block 313 is a component that is fixedly installed on the outside of the transverse slide groove 12, providing a fixed support point for the limit spring 314 and ensuring that the limit spring 314 can function stably.

[0050] The limiting spring 314 is an elastic element with its two ends connected to the movable part 3121 of the fixed block 313 and the limiting block 312, respectively. It generates elastic force through its own expansion and contraction, applying a pulling force to the movable part 3121 in the pulling direction of the pull-out ladder body 2. Since the movable part 3121 is hinged to the fixed part 3122, when subjected to the pulling force of the limiting spring 314, the movable part 3121 will rotate, thereby applying a force to the abutting limiting protrusion 211 in the pushing direction of the pull-out ladder body 2.

[0051] Specifically, when the pull-out ladder body 2 is in the retracted state or a specific working position, the bumper spring 311 on the rear crossbeam 11 abuts against the pull-out ladder body 2. Due to the elasticity of the spring, it generates a reverse thrust on the pull-out ladder body 2. The limiting block 312 extends into the transverse slide groove 12 and abuts against the limiting protrusion 211. The fixing block 313 is fixed to the outside of the transverse slide groove 12. The limiting spring 314 connects the fixing block 313 and the limiting block 312. When the pull-out ladder body 2 tends to be pulled out, the limiting block 312 stretches the limiting spring 314. The force generated by the limiting spring 314 is transmitted to the limiting protrusion 211 through the limiting block 312, thereby balancing the force applied to the pull-out ladder body 2 by the bumper spring 311. The contact spring 311 and the limit spring 314 continuously apply force to the pull-out ladder body 2, ensuring that the pull-out ladder body 2 will not be displaced in the lateral direction (i.e., in the horizontal direction parallel to the pulling direction) after it is retracted, so as to achieve the effect of limiting the pull-out ladder body 2.

[0052] The head spring 311 is designed to cushion the pull-out ladder body 2 when it retracts, preventing a hard collision between the pull-out ladder body 2 and the rear crossbeam 11, reducing wear on components and extending service life.

[0053] In this example, the lateral limiting assembly 31 also includes a front limiting block 3123, a front fixing block 313, and a front limiting spring 314, which are also disposed on the ends of the two lateral slides 12 away from the rear crossbeam 11. Specifically, when the pull-out ladder body 2 is pulled out for use, the front limiting block 3123 abuts against the limiting protrusion 211 on the upper platform 21, applying a force to the upper platform 21 in the direction of pulling out the pull-out ladder body 2, so as to ensure that the pull-out ladder body 2 will not retract towards the rear crossbeam 11 during use, thus ensuring the safety of personnel climbing the ladder.

[0054] Please see Figure 1 , Figure 5 and Figure 6 In this embodiment, the lateral limiting component 31 further includes an unlocking handle 315, which is horizontally positioned and rotatably connected to the limiting block 312.

[0055] The unlocking handle 315 is a rod-shaped structure, hinged to the movable part 3121 of the limiting block 312. The operator can push the unlocking handle 315 to rotate the movable part 3121 of the limiting block 312 relative to the fixed part 3122, thereby moving the hook-shaped end of the movable part 3121 away from the limiting protrusion 211 on the upper platform 21, thus realizing the unlocking operation of the lateral limiting of the pull-out ladder body 2.

[0056] Specifically, the unlocking handle 315 is rotatably connected to the limiting block 312. When the operator needs to pull the pull-out ladder body 2 out of the transverse slide 12, they push the unlocking handle 315. Since the unlocking handle 315 is horizontally set and rotatably connected to the limiting block 312, the unlocking handle 315 drives the limiting block 312 to overcome the tension of the limiting spring 314 and rotate towards the rear crossbeam 11, causing the limiting block 312 to separate from the limiting protrusion 211, releasing the abutment relationship between the two, thereby releasing the transverse limitation on the pull-out ladder body 2. At this time, the pull-out ladder body 2 can slide freely along the transverse slide 12.

[0057] The design of the unlocking handle 315 makes the unlocking operation of the lateral limit of the pull-out ladder body 2 simple and convenient. The operator only needs to push the unlocking handle 315 to release the limit, which reduces the difficulty of operation and improves the efficiency of operation. The unlocking handle 315 is a long bar-shaped structure, which allows the operator to complete the unlocking operation from a position away from the rear crossbeam 11, improving the convenience of use.

[0058] Meanwhile, the other end of the unlocking handle 315 is hinged to the front limit block 3123, so that the front limit block 3123 can release the restriction on the pull-out ladder body 2 when it is retracted without the need for additional unlocking components. The limit block 312 and the front limit block 3123 share the same unlocking handle 315, which reduces production costs.

[0059] Please see Figure 3 In this embodiment, the end of the unlocking handle 315 furthest from the rear crossbeam 11 has an arc-shaped hook. The arc-shaped hook is similar in shape to a hook, making it easy for the operator to grip and push the unlocking handle 315. Specifically, when the operator needs to pull or push the unlocking handle 315, their fingers can naturally rest on the arc-shaped hook, increasing the contact area and friction between the fingers and the unlocking handle 315. This allows the operator to apply force to the limiting block 312 and the front limiting block 3123 more effortlessly and stably, preventing slippage during pulling and ensuring smooth rotation of the limiting block 312 to achieve the unlocking operation.

[0060] Please see Figure 4 In this embodiment, the longitudinal limiting structure 32 is a wedge-shaped spring sheet. A wedge-shaped spring sheet is an elastic sheet structure with a wedge shape, which has a certain elasticity, can deform under pressure, and generate an elastic force to restore its original shape.

[0061] An opening is provided on the upper surface of the transverse slide groove 12, and the wedge-shaped spring sheet is welded or riveted to the opening. The middle part of the wedge-shaped spring sheet is located inside the transverse slide groove 12, and the two ends extend out of the opening.

[0062] Specifically, when the upper platform 21 of the pull-out ladder body 2 slides within the transverse slide groove 12, the upper surface of the upper platform 21 comes into contact with the wedge-shaped spring plate. Because the wedge-shaped spring plate is elastic, it is compressed by the upper platform 21 and deforms, generating a downward elastic force that acts on the upper surface of the upper platform 21. This downward elastic force creates pressure between the upper platform 21 and the inner bottom wall of the transverse slide groove 12, increasing the friction between them and thus restricting the longitudinal (vertical) movement of the pull-out ladder body 2. Simultaneously, the wedge shape ensures a tighter contact between the spring plate and the upper platform 21. As the upper platform 21 moves, the wedge-shaped spring plate continuously applies pressure, ensuring the stability of the longitudinal limit.

[0063] The wedge-shaped spring plate has a simple structure and is easy to install. It can effectively limit the longitudinal movement of the pull-out ladder body 2, ensuring that the pull-out ladder body 2 will not sway up and down during vehicle movement, thus improving stability. At the same time, the spring plate has good elasticity and can adapt to the displacement of the upper platform 21. While playing a limiting role, it will not cause excessive resistance to the pulling operation of the pull-out ladder body 2, ensuring smooth operation.

[0064] Please see Figure 1 and Figure 7 In this embodiment, a positioning detection unit 4 is also included. The positioning detection unit 4 includes a travel sensor 41 and a travel switch 42. The travel sensor 41 is disposed on the upper platform 21, and the travel switch 42 is disposed on the outside of the transverse slide 12. The travel sensor 41 pushes the travel switch 42, and the travel switch 42 transmits a signal to the driver's cab.

[0065] The positioning detection unit 4 is used to detect whether the pull-out ladder body 2 has been properly retracted after use. The travel sensor 41 is a tubular structure that moves with the upper platform 21. When the pull-out ladder body 2 reaches a specific position, it contacts and pushes the travel switch 42. The travel switch 42 is an electrical switch located on the outside of the transverse slide 12. When pushed by the travel sensor 41, it changes its on / off state, thereby transmitting a signal.

[0066] Specifically, when the pull-out ladder body 2 retracts inward along the transverse slide 12, the travel sensor 41 on the upper platform 21 also moves accordingly. When the pull-out ladder body 2 reaches the preset position, the travel sensor 41 pushes the push rod on the limit switch 42. After the push rod moves, the contacts inside the limit switch 42 will activate, changing the on / off state of the circuit and generating an electrical signal. This electrical signal is transmitted through wires to the control panel or display device in the operator's cab, allowing the operator to know in a timely manner whether the pull-out ladder body 2 has been retracted into place (i.e., the limit mechanism 3 has successfully limited the pull-out ladder body 2).

[0067] The placement detection unit 4 improves the convenience and accuracy of operation. Operators can know whether the pull-out ladder body 2 has been retracted into place without getting off the vehicle to check, saving operation time and improving work efficiency.

[0068] Please see Figure 1 In this embodiment, the pull-out ladder body 2 further includes a support frame 22 and multiple steps 23. The support frame 22 is rotatably connected to the upper platform 21, and the multiple steps 23 are evenly arranged on the support frame 22. The support frame 22 is the supporting structure of the pull-out ladder body 2, with one end rotatably connected to the upper platform 21, allowing it to rotate relative to the upper platform 21. The steps 23 are components for operators to step on, and the multiple steps 23 are evenly arranged on the support frame 22, providing support points for operators to go up and down the pull-out ladder.

[0069] Specifically, the pedal 23 is movably connected to the support frame 22 by bolts. Alternatively, the pedal 23 can be fixedly connected to the support frame 22 by welding.

[0070] The support frame 22 is rotatably connected to the upper platform 21, allowing it to rotate around the connection point. When the pull-out ladder body 2 is in use, the support frame 22 is rotated downwards and unfolded, forming an angle with the upper platform 21. At this time, multiple steps 23 evenly arranged on the support frame 22 are horizontal, allowing operators to ascend and descend the pull-out ladder by stepping on the steps 23. When the pull-out ladder body 2 is not in use, the support frame 22 is rotated upwards until it is flush with the upper platform 21, and then pushed back to retract the pull-out ladder into the horizontal slide groove 12 for storage.

[0071] Multiple evenly spaced footboards 23 provide stable footholds for operators, ensuring their safety and convenience when going up and down the pull-out ladder, and improving boarding efficiency.

[0072] Please see Figure 1 In this embodiment, both the upper platform 21 and the pedal 23 are provided with multiple through holes. The through holes are multiple holes opened on the upper platform 21 and the pedal 23. The shape of the holes can be a regular shape such as a circle or a square, or an irregular shape, and they can be evenly or randomly distributed on the upper platform 21 and the pedal 23.

[0073] In rainy or other humid environments, the through holes can drain water from the upper platform 21 and the steps 23 in a timely manner, preventing operators from slipping due to water accumulation and ensuring safety when climbing the ladder. The through holes can reduce the weight of the upper platform 21 and the steps 23, thereby reducing the weight of the entire pull-out ladder body 2 and making the pull-out operation more effortless. When rinsing the pull-out ladder body 2, wastewater can flow away quickly through the through holes, improving cleaning efficiency.

[0074] Please see Figure 3 and Figure 4 In this embodiment, pulleys 24 are provided on both sides of the upper platform 21 and the support frame 22. The pulleys 24 are rolling components provided on both sides of the upper platform 21 and the support frame 22, and are composed of a wheel body and a wheel axle. The wheel body can rotate freely around the wheel axle, reducing the friction when the pull-out ladder body 2 slides in the transverse slide groove 12.

[0075] The pulleys 24 on both sides of the upper platform 21 and the support frame 22 are in contact with the inner wall of the transverse slide 12. When the pull-out ladder body 2 is pulled out along the transverse slide 12, the pulleys 24 roll in the transverse slide 12, which transforms the sliding friction between the pull-out ladder body 2 and the transverse slide 12 into rolling friction, greatly reducing the friction between the two, making the pull-out operation easier and smoother, reducing the labor intensity of the operator, and improving the operating efficiency.

[0076] Compared with the prior art, this utility model effectively restricts the lateral and longitudinal movement of the pull-out ladder body 2 by setting a limiting mechanism 3, avoiding swaying and displacement of the pull-out ladder during vehicle operation, and greatly improving the safety and stability of use; the setting of a positioning detection unit 4 allows the operator to know whether the pull-out ladder body 2 has been retracted into place without getting off the vehicle to check, saving operation time and improving work efficiency.

[0077] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this utility model, this should not limit the scope of patent protection of this utility model. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this utility model and utilizing the content described in the text and drawings of this utility model, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this utility model.

Claims

1. A folding draw ladder for vehicles, characterized in that, include: A slide frame, the slide frame including a rear crossbeam and two oppositely arranged transverse slide grooves, the rear crossbeam connecting the two transverse slide grooves; The pull-out ladder body is disposed between two horizontal slide grooves and slidably connected to the horizontal slide grooves. The pull-out ladder body includes an upper platform, and limit protrusions are provided on both sides of the upper platform. The limit protrusions are placed in the horizontal slide grooves. The limiting mechanism includes a lateral limiting component and a longitudinal limiting structure. The lateral limiting component is disposed on the slide frame and abuts against the limiting protrusion to restrict the lateral movement of the pull-out ladder body. The longitudinal limiting structure is disposed inside the lateral slide groove and abuts against the upper surface of the upper platform to restrict the longitudinal movement of the pull-out ladder body.

2. The folding draw ladder of claim 1, wherein, The lateral limiting assembly includes a stop spring, a limiting block, a fixing block, and a limiting spring. The stop spring is disposed on the side of the rear crossbeam opposite to the pull-out ladder body and abuts against the pull-out ladder body. The limiting block extends into the lateral slide groove and abuts against the limiting protrusion. The fixing block is fixedly disposed on the outside of the lateral slide groove. The two ends of the limiting spring are respectively connected to the fixing block and the limiting block.

3. The folding draw ladder of claim 2, wherein, The lateral limiting component also includes an unlocking handle, which is horizontally positioned and rotatably connected to the limiting block.

4. The folding draw ladder of claim 3 wherein, The end of the unlocking handle away from the rear crossbeam has an arc-shaped hook.

5. The folding draw ladder of claim 1 wherein, The longitudinal limiting structure is a wedge-shaped spring sheet.

6. The folding draw ladder of claim 1 wherein, It also includes a positioning detection unit, which includes a travel sensor and a travel switch. The travel sensor is located on the upper platform, and the travel switch is located on the outside of the transverse slide. The travel sensor pushes the travel switch, and the travel switch transmits a signal to the driver's cab.

7. The folding draw ladder of claim 1 wherein, The pull-out ladder body also includes a support frame and multiple steps. The support frame is rotatably connected to the upper platform, and the multiple steps are evenly arranged on the support frame.

8. The folding draw ladder of claim 7, wherein, Both the upper platform and the pedal are provided with multiple through holes.

9. A vehicle-mounted folding pull-out ladder according to claim 7, characterized in that, Both sides of the upper platform and the support frame are equipped with pulleys.

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