Multi-stage drawing type crawling ladder

Abstract

The utility model provides a multi-stage drawing type crawling ladder. The multi-stage drawing type crawling ladder comprises a first-stage assembly unit, a second-stage assembly unit and a third-stage assembly unit, the first-stage assembly unit comprises a pair of first-stage rails, and the bottoms of the tail ends of the first-stage rails are connected with first-stage limiting baffles. The second-stage assembly unit comprises a pair of second-stage rails arranged in the first-stage rail in a sliding mode, fasteners are arranged on the outer sides of the top ends of the second-stage rails, closed grooves with openings in the inner sides are formed in the tails of the second-stage rails, and a pair of second-stage limiting check blocks are arranged at the front ends of the closed grooves; the third-level assembly unit comprises a pair of third-level longitudinal stand supports arranged in the second-level track in a sliding mode, abrasion-resistant blocks matched with the closed grooves in a sliding mode are arranged on the two sides of the top ends of the third-level longitudinal stand supports, a plurality of third-level pedals are arranged between the third-level longitudinal stand supports, and handles are arranged at the tails of the third-level longitudinal stand supports through torsional springs. According to the multi-stage drawing type crawling ladder, the direction of the crawling ladder can be changed, multi-angle assembly of the crawling ladder is achieved, the application range is widened, and folding storage and self-locking are achieved.

Description

Technical Field

[0001] The utility model relates to the field of ladders, and more specifically, to a multi-stage pull-out ladder. Background Art

[0002] At present, with the continuous progress of the domestic commercial vehicle field, various types of vehicles, whether it is fire trucks, dump trucks, semi-trailer special vehicles, etc., are developing more towards specialization and refinement. As the only device for personnel to get on and off the vehicle, the current structures of vehicle ladders are mostly simple frame-type welded or welded ones, and there are also articulated flip-up or pull-out structures. However, most of the existing ladders have problems such as inconvenient actual use, inconvenient storage, occupying the vehicle body size, or affecting the overall appearance of the vehicle.

[0003] The invention patent application with the publication number of CN117549837A discloses a portable hydraulic foldable ladder, which includes an upper folding ladder and a lower folding ladder connected by hinges. The upper folding ladder is hinged to the vehicle frame through a hinge connecting member. There is a first driving structure between the bottom of the upper folding ladder and the vehicle frame that can make the upper folding ladder rotate around the hinge connecting member as the axis. There is a second driving structure between the upper folding ladder and the lower folding ladder that can make the lower folding ladder rotate around the hinge as the axis. The first driving structure and the second driving structure are connected with a control component. The unfolding and folding actions of the overall folding ladder are controlled by an electric switch, and the folding state of the overall folding ladder can be controlled quickly and flexibly; the overall folding ladder has a simple structure, a small volume and a light weight after folding; the walking pedal is flat after the overall folding ladder is unfolded and landed, which is convenient for walking and has a hydraulic self-locking function, and has a large load-bearing capacity. However, this portable hydraulic foldable ladder cannot change the direction of the ladder. Content of the Utility Model

[0004] In order to be able to change the direction of the ladder, realize multi-angle assembly of the ladder, expand the use range, and realize folding storage and self-locking, the technical solution adopted by the utility model is: a multi-stage pull-out ladder, which includes a first-stage component unit, a second-stage component unit and a third-stage component unit;

[0005] The first-stage component unit includes a pair of first-stage tracks. At the top of the pair of first-stage tracks, there is an installation bracket connected, and at the bottom of the tail ends of the pair of first-stage tracks, there is a first-stage limit baffle connected;

[0006] The second-stage component unit includes a pair of second-stage tracks slidably arranged in the first-stage tracks. On the outer side of the top of the second-stage tracks, there are fasteners for holding the top ends of the first-stage tracks. The tail of the second-stage tracks forms a closed groove with an inner opening. At the front end of the closed groove, there are a pair of second-stage limit blocks for blocking the top end of the third-stage component unit. Between the lower sides of the pair of closed grooves, there is a second-stage limit column for supporting the third-stage component unit;

[0007] The three - level component unit includes a pair of three - level longitudinal vertical supports slidably arranged in the second - level track. Wear - resistant blocks that are slidably engaged with the closed groove are arranged on both sides of the top of the three - level longitudinal vertical supports. A plurality of three - level pedals are arranged between the three - level longitudinal vertical supports. A handle for clamping the first - level limit baffle is arranged at the tail of the three - level longitudinal vertical support through a torsion spring.

[0008] Based on the above, the length value of the three - level longitudinal vertical support is greater than the length value of the first - level track, and the length value of the second - level track is greater than the length value of the three - level longitudinal vertical support.

[0009] Based on the above, in order to increase the structural stability, a positioning round steel for installing the wear - resistant block is arranged at the top of the three - level longitudinal vertical support.

[0010] Based on the above, in order to facilitate personnel to stand, second - level pedals are also arranged on the upper sides of the tails of a pair of the second - level tracks.

[0011] Based on the above, end closing plates are also connected to the tops of a pair of the second - level tracks.

[0012] Based on the above, limit holes are formed in the three - level pedals corresponding to the positions of the handles.

[0013] Based on the above, in order to facilitate support, the cross - section of the second - level limit stop post is an isosceles trapezoid.

[0014] The utility model has substantial features and progress compared with the prior art. Specifically, the multi - level pull - out ladder provided by the utility model realizes the modular design of the ladder unit, the assembled connection of the ladder itself, and the assembled connection of the ladder and the vehicle body. The assembly form of the ladder itself and the vehicle body can achieve various installation methods such as horizontal placement and vertical placement through the structural adjustment of the first - level components. The ladder extremely conveniently realizes the problems of unfolding and retracting through the torsion spring and the handle, and can meet the usage requirements in different scenarios, such as for special vehicles, fire trucks, or camping caravans and other vehicle types. At the same time, various layout methods can be realized by adjusting the position of the mounting bracket, and various assembly angles can be realized by adjusting the shape of the second - level baffle to meet the usage requirements in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the multi - level pull - out ladder provided by the utility model in the unfolded state.

[0016] Figure 2 is a schematic diagram of the split structure of the multi - level pull - out ladder provided by the utility model.

[0017] Figure 3 and Figure 4 is a schematic structural diagram of the multi - level pull - out ladder provided by the utility model in the stored state.

[0018] In the figure: 1. Primary component unit; 2. Fastener; 3. End cover plate; 4. Secondary component unit; 5. Mounting bracket; 6. Secondary track; 7. Secondary limit stop; 8. Primary track; 9. Primary limit baffle; 10. Secondary pedal; 11. Secondary limit stop post; 12. Wear-resistant block; 13. Tertiary longitudinal brace; 14. Tertiary pedal; 15. Positioning round steel; 16. Handle; 17. Limit hole; 18. Enclosed groove; 19. Mounting head; 20. Tertiary component unit. Detailed implementation mode

[0019] The technical solution of the present utility model will be further described in detail below through specific implementation modes.

[0020] Embodiment 1

[0021] This embodiment provides a multi-stage pull-out ladder, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , including a primary component unit 1, a secondary component unit 4 and a tertiary component unit 20.

[0022] The primary component unit 1 includes a pair of primary tracks 8. A mounting bracket 5 is connected to the top of the pair of primary tracks 8, and a primary limit baffle 9 is connected to the bottom of the tail ends of the pair of primary tracks 8.

[0023] The secondary component unit 4 includes a pair of secondary tracks 6 slidably disposed within the primary tracks 8. A fastener 2 for gripping the top end of the primary track 8 in the deployed state is provided on the outer side of the top end of the secondary track 6. The fastener can be a bolt, and the stud part extends out of the primary track.

[0024] The tail of the secondary track 6 forms an enclosed groove 18 with an inner opening. A pair of secondary limit stops 7 for blocking the top end of the tertiary component unit 20 in the retracted and folded state are provided at the front end of the enclosed groove 18. A secondary limit stop post 11 for supporting the tertiary component unit 20 in the deployed state is connected between the lower sides of the pair of enclosed grooves 18.

[0025] The tertiary component unit 20 includes a pair of tertiary longitudinal braces 13 slidably disposed within the secondary tracks 6. A positioning round steel 15 is provided at the top end of the tertiary longitudinal brace 13, and both sides of the positioning round steel 15 extend out of the tertiary longitudinal brace to form a mounting head 19, and a wear-resistant block 12 slidably engaged with the enclosed groove 18 is provided on the mounting head 19. The wear-resistant block 12 can be a rubber block.

[0026] A plurality of third - level pedals 14 are arranged between the third - level vertical braces 13. A handle 16 for clamping the first - level limit baffle 9 is arranged at the tail of the third - level vertical brace 13 through a torsion spring. The handle can be an L - shaped handle.

[0027] Specifically, in this embodiment, the length value of the third - level vertical brace is greater than the length value of the first - level track, and the length value of the second - level track is greater than the length value of the third - level vertical brace. To increase the structural stability, a positioning round steel for installing the wear - resistant block is arranged at the top of the third - level vertical brace.

[0028] Embodiment 2

[0029] This embodiment provides a multi - stage pull - out ladder. The main difference from Embodiment 1 is that in this embodiment: To facilitate personnel standing, a second - level pedal 10 is further arranged on the upper side of the tail ends of a pair of the second - level tracks 6. An end sealing plate 3 is further connected to the tops of a pair of the second - level tracks 6. A limit hole 17 is opened at the position corresponding to the handle 16 on the third - level pedal 14. To facilitate support, the cross - section of the second - level limit post is an isosceles trapezoid.

[0030] Specifically, in the first - level component unit, the mounting bracket serves as the assembly point of the whole ladder and the vehicle frame and plays an installation role. The first - level limit baffle plays a role in blocking the outward sliding of the handle when the whole ladder is in the retracted state, so that the ladder remains in the retracted state and improves safety.

[0031] The second - level track in the second - level component unit is of a groove - type structure and serves as the track for the third - level component unit. The end sealing plate plays a role in connecting and strengthening the left and right second - level tracks at the tail. The fastener is installed after the second - level component unit and the first - level component unit are assembled, and plays a role in limiting to prevent the two from separating from the rear end. The second - level limit block is installed at the storage position after the third - level component unit and the second - level component unit are assembled, and plays a role in restricting the rearward movement of the third - level component. The second - level pedal serves as a platform for personnel to wait on the ladder for a long time to stand. Various materials or structures that can play an anti - slip role, such as porous anti - slip plates and patterned plates, can be used. The second - level limit post forms a certain angle with the self - support when the third - level component unit is unfolded, meeting the needs of personnel to board the ladder more conveniently;

[0032] The third - level vertical brace in the third - level component unit plays a supporting role for the main body of the third - level component and cooperates with the second - level limit block to realize the appropriate angle of the third - level component when unfolded. The wear - resistant block plays a wear - resistant role when sliding between the second - level component and the third - level component. Materials such as wear - resistant hard plastics can be used, and at the same time, the self - weight of the ladder can be reduced.

[0033] Meanwhile, when the three - level component is in the unfolded state, the wear - resistant block plays a role in supporting and buffering between the positioning round steel and the secondary track. The positioning round steel cooperates with the secondary track through the wear - resistant block to achieve the assembly of the secondary and three - level components. Here, the length of the positioning round steel is designed to be greater than the internal control dimension of the secondary component, so that during initial assembly and manufacturing, the three - level ladder must be tilted vertically at a certain angle and rotated to be placed into the slideway of the secondary component. In this way, it is impossible to disassemble them horizontally during normal use, which is safer.

[0034] When disassembly and repair are required, first remove the secondary limit block, then fully retract the three - level component into the secondary track, and then operate in the reverse direction to rotate and take out the three - level component, thereby improving the overall safety of the ladder. The three - level pedal serves as the pedal for personnel to climb the ladder, and a porous anti - slip plate or a patterned plate and other structures can be used;

[0035] Under the action of the torsion spring, when a person pulls up the handle, the multi - level unfolding of the ladder can be realized. When the handle is put down, the handle rotates downward, and the convex platform on the lower edge of the handle catches on the first - level limit baffle, combined with the secondary limit block, thus ensuring that the secondary component and the three - level component cannot slide backward.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications can still be made to the specific implementation manners of the present invention or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A multi-stage telescopic ladder, characterized in that: It includes a first-level component unit, a second-level component unit and a third-level component unit; The first-level component unit includes a pair of first-level tracks. An installation bracket is connected to the top of the pair of first-level tracks, and a first-level limit baffle is connected to the bottom of the tail ends of the pair of first-level tracks; The second-level component unit includes a pair of second-level tracks slidably arranged in the first-level tracks. Fasteners for gripping the top ends of the first-level tracks are arranged on the outer sides of the top ends of the second-level tracks. A closed groove with an inner opening is formed at the tail of the second-level tracks. A pair of second-level limit blocks for blocking the top ends of the third-level component unit are arranged at the front ends of the closed groove. A second-level limit column for supporting the third-level component unit is connected between the lower sides of the pair of closed grooves; The third-level component unit includes a pair of third-level longitudinal struts slidably arranged in the second-level tracks. Wear-resistant blocks slidably matched with the closed groove are arranged on both sides of the top ends of the third-level longitudinal struts. A plurality of third-level pedals are arranged between the third-level longitudinal struts. Handles for clamping the first-level limit baffle are arranged at the tails of the third-level longitudinal struts through torsion springs.

2. The multi-stage pull-out ladder according to claim 1, characterized in that: The length value of the third-level longitudinal struts is greater than the length value of the first-level tracks, and the length value of the second-level tracks is greater than the length value of the third-level longitudinal struts.

3. The multi-stage pull-out ladder according to claim 1 or 2, characterized in that: Positioning round steel for installing the wear-resistant blocks is arranged at the top ends of the third-level longitudinal struts.

4. The multi-stage pull-out ladder according to claim 3, characterized in that: Second-level pedals are further arranged on the upper sides of the tail ends of the pair of second-level tracks.

5. The multi-stage pull-out ladder according to claim 4, characterized in that: End plates are further connected to the top ends of the pair of second-level tracks.

6. The multi-stage pull-out ladder according to claim 5, characterized in that: Limit holes are formed in the third-level pedals corresponding to the positions of the handles.

7. The multi-stage pull-out ladder according to claim 6, wherein: The cross section of the second-level limit column is an isosceles trapezoid.

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