Adjustable ladder stand
The hinged inner and outer support rods and locking plate structure enable multi-position adjustment of the ladder angle, solving the instability problem of existing ladders when the cabin height changes, and improving safety and practicality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-14
AI Technical Summary
The existing ladder's steps and vertical bars are not movable, causing instability and preventing it from leveling when the cabin height changes, posing a safety hazard.
Design an adjustable ladder that allows for angle adjustment between the steps and the support rods through a hinged inner and outer support rod and locking plate structure, and achieves multiple angle locking positions by fixing with bolts and nuts.
The ladder can be adjusted at an angle to ensure the steps are level, improving safety and practicality and preventing falls.
Smart Images
Figure CN224120181U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of ladder technology, specifically to an adjustable ladder. Background Technology
[0002] A wind turbine consists of several main modules: a rotor (comprised of blades and a hub connecting the blades and the main shaft), a nacelle (with the transmission structure installed inside), and a tower (supported on the ground). The rotor is installed at the front of the nacelle, capturing wind energy and converting it into rotational mechanical energy.
[0003] To access the nacelle for installation, inspection, or maintenance, workers use ladders placed between the nacelle and the ground. Existing ladders consist of a frame made of footboards and vertical bars, which are fixed in place. The footboards are horizontal, and the vertical bars have a fixed angle. If the nacelle's height changes, the angle of the vertical bars may not meet design requirements, making the footboards unstable and unsafe for workers. Therefore, existing ladders are impractical. Summary of the Invention
[0004] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide an adjustable ladder with multiple adjustable angles, so that the ladder can reach the required height and is safer and more practical.
[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:
[0006] An adjustable ladder includes a set of steps arranged in a plurality of them; the inner side of each step is hinged to an inner support rod by a first bolt, and the outer side of each step is hinged to an outer support rod by a second bolt, and the inner support rod and the outer support rod can move relative to each other.
[0007] A locking plate is fitted onto the second bolt. One end of the locking plate has a first through hole. The second bolt passes through the first through hole and is screwed on with a nut for fixation. The other end of the locking plate has several toothed first adjustment holes. The first bolt passes through the first adjustment hole and is screwed on with a manual nut for fixation.
[0008] Based on the above scheme and as a preferred embodiment of the above scheme: a footboard at the top is equipped with two hooks, the top of the hooks is bent into a hook shape; angle steel is welded to the bottom of the hooks, and screws pass through the footboard and angle steel and are screwed on with nuts to fix them.
[0009] Based on the above scheme and as a preferred option, a reinforcing plate is welded between the hook and the angle steel.
[0010] Based on the above scheme and as a preferred embodiment of the above scheme: the head of the hook is hinged to the slide plate; the slide plate is curved in an arc shape, and a first rotating hole and a second rotating hole are opened on the slide plate, with the two ends of the first rotating hole protruding outward; two screws pass through the first rotating hole and the second rotating hole respectively and are connected and fixed to the hook; the slide plate can rotate relative to the hook to reduce the opening of the hook.
[0011] Based on the above scheme and as a preferred embodiment of the above scheme: it also includes a pad block, the cross-section of which is U-shaped; the bottom of the inner support rod and the bottom of the outer support rod are respectively inserted into the pad block, and the bolt passes through the side wall of the pad block to achieve a hinged connection and fixation with the inner support rod and the outer support rod.
[0012] Based on the above scheme and as a preferred embodiment of the above scheme: a handle is welded to the outer surface of the pad.
[0013] Based on the above scheme and as a preferred embodiment, the following further includes a handrail frame; the handrail frame includes horizontal and vertical tubes, bolts pass through the horizontal and vertical tubes and are screwed on nuts for fixation, and the top of the handrail frame is spliced into a rectangle; the bottom surface of the vertical tube has two opposing first slots facing upwards; it also includes a first connecting plate, a first bolt and a second bolt respectively pass through both ends of the first connecting plate for fixation, a columnar first limiting sleeve is welded to the outer surface of the first connecting plate, a first limiting rod is provided inside the bottom of the first limiting sleeve, and a first positioning block is fixed to the top outer surface of the first limiting sleeve; the vertical tube is inserted into the first limiting sleeve, the first limiting rod is embedded in the first slot for fixation, and the bolt is screwed into the first positioning block to abut against the vertical tube for fixation.
[0014] The outstanding and beneficial technical effects of this utility model compared to the prior art are:
[0015] Compared with the prior art, the adjustable ladder of this utility model has an inner support rod and an outer support rod hinged to both sides of the step. They can be rotated relative to each other as needed. After reaching the required angle, the first and second bolts are tightened to keep it fixed. At the same time, the locking plate is put on the first and second bolts and tightened respectively. The ladder can be locked by manually tightening the nut, thus achieving the angle locking effect.
[0016] The ladder of this invention allows for multiple adjustable height levels by adjusting the angle A with the ground.
[0017] The highest step is equipped with hooks that can be hung on a fixed column to prevent the ladder from falling. Additionally, sliding plates are located on the sides of the hooks for a closed, secure hold. All joints in the horizontal and vertical sections are connected with bolts and nuts for quick assembly and disassembly, and the handrails remain parallel to the ladder at all times. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model.
[0020] Figure 3 This is a schematic diagram of the overall exploded structure of this utility model.
[0021] Figure 4 This is a partial structural schematic diagram of the present invention.
[0022] Figure 5 This is a schematic diagram of the locking plate structure of this utility model.
[0023] Figure 6 This is a schematic diagram of the hook structure of this utility model.
[0024] Figure 7 This is a schematic diagram of the hook structure of this utility model.
[0025] Figure 8 This is a schematic diagram of the pad structure of this utility model.
[0026] Reference numerals: pedal 01; first bolt 02; inner support rod 03; second bolt 04; outer support rod 05; locking plate 06; first through hole 060; first adjusting hole 061; hook 07; angle steel 08; reinforcing plate 080; sliding plate 09; first rotating hole 090; second rotating hole 091; pad 10; handle 100; handrail frame 11; horizontal tube 110; vertical tube 111; first slot 1110; first connecting plate 12; first limiting sleeve 120; first limiting rod 121; first positioning block 122. Detailed Implementation
[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments;
[0028] This embodiment provides an adjustable ladder, including pedals 01, with a plurality of pedals 01 arranged in a row; the pedals 01 are made of metal plates bent and welded into cuboids, which can withstand long-term stepping and have a long service life.
[0029] The inner side of each pedal 01 is hinged to the inner support rod 03 by the first bolt 02; loosen the first bolt 02 and nut, the pedal 01 and the inner support rod 03 can rotate relative to each other, and then lock the included angle.
[0030] The outer side of each pedal 01 is hinged to the outer support rod 05 by the second bolt 04. Similar to the inner support rod 03, by loosening the second bolt 04 and nut, the pedal 01 and the outer support rod 05 can move relative to each other; the inner support rod 03 and the outer support rod 05 can also move relative to each other; thus achieving the effect of adjusting the angle and adapting to different height requirements.
[0031] A locking plate 06 is fitted onto the second bolt 04. One end of the locking plate 06 has a first through hole 060. The second bolt 04 passes through the first through hole 060 and is screwed on with a nut for fixation. The other end of the locking plate 06 has a first adjustment hole 061 with several teeth. The first bolt 02 passes through the first adjustment hole and is screwed on with a manual nut for fixation.
[0032] like Figure 5 As shown, the locking plate 06 is a long metal plate. The first through hole 060 is opened on one end of the locking plate 06 for the second bolt 04 or the first bolt 02 to pass through and be screwed on to fix the nut. The first adjustment hole 061 is opened on the other end of the locking plate 06 for the first bolt 02 or the second bolt 04 to pass through and be screwed on to fix the manual nut. The first adjustment hole 061 is a series of adjacent round holes that match the outer diameter of the bolts. The installation position of the first through hole 060 is higher than that of the first adjustment hole 061, which makes it convenient for the operator to swing the locking plate 06. After the inner support rod 03 and the outer support rod 05 are rotated and adjusted, they are locked in place by the locking plate 06 to achieve the angle locking effect. The manual nut is a wing nut or a lug nut, which can be tightened by hand.
[0033] As described above, based on the height of the cabin, the angles of the inner support rod 03 and the outer support rod 05 relative to the pedal 01 are rotated to make the pedal 01 horizontal; at the same time, the second bolt 04 passes through the first through hole 060 of the locking plate 06 and is screwed on with a nut to fix it, and the first bolt 02 passes through the first adjustment hole 061 of the locking plate 06 and is screwed on with a manual nut to fix it, thereby achieving angle locking; after adjusting to the required position, the nut can be manually tightened to lock the ladder; the angle between the ladder and the ground can be adjusted, making it more practical.
[0034] Furthermore, the top step 01 is equipped with two hooks 07, the top of which is bent into a hook shape; the hooks 07 can be hung on a fixed columnar object to prevent the ladder from falling off. Angle steel 08 is welded to the bottom of the hooks 07, and screws pass through the step 01 and the angle steel 08 and are screwed on with nuts to secure them.
[0035] As described above, screws are used to fix the highest-level pedal 01 through the angle iron 08, so that the hook 07 can be detached and removed when not needed.
[0036] Furthermore, a reinforcing plate 080 is welded between the hook 07 and the angle steel 08.
[0037] As described above, the reinforcing plate 080 is welded at the splicing position to form a triangular structure, which strengthens the firmness and stability of the hook 07 and prevents it from bending or deforming.
[0038] Furthermore, a slide plate 09 is hinged to the outer side of the head of the hook 07; the slide plate 09 is a metal plate; the slide plate 09 is curved in an arc shape, and a first rotating hole 090 and a second rotating hole 091 are provided on the slide plate 09. The two ends of the first rotating hole 090 are raised outward; the two ends of the first rotating hole 090 are used to rotate to the two end positions to achieve a stop and limit.
[0039] Two screws pass through the first rotating hole 090 and the second rotating hole 091 respectively and are connected and fixed to the hook 07; the slide plate 09 can rotate relative to the hook 07 to reduce the opening of the hook 07.
[0040] As described above, a sliding plate 09 is provided on the side of the hook 07. After the hook 07 is hung on the column, the sliding plate 09 is slid outward to narrow the opening and achieve a "closed" fixation, making it difficult for the hook 07 to come off.
[0041] Furthermore, it also includes a pad 10, the cross-section of which is U-shaped; the bottom of the inner support rod 03 and the bottom of the outer support rod 05 are respectively inserted into the pad 10, and the bolts pass through the side wall of the pad 10 to achieve hinged connection and fixation with the inner support rod 03 and the outer support rod 05.
[0042] As described above, the pad 10 connects the bottoms of the inner support rod 03 and the outer support rod 05 together, increasing the contact friction surface with the ground, making it less prone to slippage and more stable and safe.
[0043] Furthermore, a handle 100 is welded to the outer surface of the pad 10.
[0044] As described above, the pad 10 is formed by bending a metal plate, and the welded handle 100 facilitates handling and movement.
[0045] Furthermore, it also includes a handrail frame 11; the handrail frame 11 includes a horizontal tube 110 and a vertical tube 111, bolts are passed through the horizontal tube 110 and the vertical tube 111 and nuts are screwed on to fix them, and the top of the handrail frame 11 is spliced into a rectangle; the horizontal tube 110 and the vertical tube 111 are round tubes, and bolts are used to connect them according to the required size, and the two can be rotated relative to each other to obtain a suitable rhomboid shape, and the nuts are tightened to lock them in place;
[0046] The bottom surface of the vertical tube 111 has two opposing first slots 1110.
[0047] It also includes a first connecting plate 12, with a first bolt 02 and a second bolt 04 passing through both ends of the first connecting plate 12 for fixation; the first connecting plate 12 is a metal plate connected to the outside of the inner support rod 03 and the outer support rod 05; a columnar first limiting sleeve 120 is welded to the outer surface of the first connecting plate 12, a first limiting rod 121 is provided inside the bottom of the first limiting sleeve 120, and a first positioning block 122 is fixed to the top outer surface of the first limiting sleeve 120; the first limiting sleeve 120 is a columnar shell formed by bending a metal sheet, with a hole opened at the bottom of the first limiting sleeve 120, into which the metal first limiting rod 121 is inserted and welded for fixation; the hole of the first positioning block 122 is a metal block, which is welded to the surface of the first limiting sleeve 120, and a threaded hole is opened on the first positioning block 122;
[0048] The vertical tube 111 is inserted into the first limiting sleeve 120, the first limiting rod 121 is embedded in the first slot 1110 for fixation, and the bolt is screwed into the first positioning block 122 to abut against the vertical tube 111 for fixation.
[0049] As described above, the first limiting sleeve 120 wraps around the vertical tube 111, instructing the first limiting rod 121 to provide support for the first slot 1110, and the bolt abuts against the vertical tube 111 to keep it stationary and stable when held by hand.
[0050] In another embodiment, the vertical tube 111 is inserted into the first limiting sleeve 120 and welded in place.
[0051] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this utility model, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection.
[0053] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.
Claims
1. An adjustable ladder, characterized in that: Includes pedals, with several pedals arranged in an arrangement; the inner side of each pedal is hinged to an inner support rod via a first bolt, and the outer side of each pedal is hinged to an outer support rod via a second bolt, allowing the inner and outer support rods to move relative to each other; A locking plate is fitted onto the second bolt. One end of the locking plate has a first through hole. The second bolt passes through the first through hole and is screwed on with a nut for fixation. The other end of the locking plate has several toothed first adjustment holes. The first bolt passes through the first adjustment hole and is screwed on with a manual nut for fixation.
2. The adjustable ladder according to claim 1, characterized in that: The top pedal is equipped with two hooks, the top of which is bent into a hook shape; the bottom of the hook is welded with angle steel, and screws pass through the pedal and angle steel and are screwed on with nuts to secure them.
3. The adjustable ladder according to claim 2, characterized in that: A reinforcing plate is welded between the hook and the angle steel.
4. The adjustable ladder according to claim 2, characterized in that: The hook head is hinged to a slide plate; the slide plate is curved in an arc shape, and a first rotating hole and a second rotating hole are provided on the slide plate, with the two ends of the first rotating hole curving outwards; Two screws are respectively passed through the first and second pivot holes and connected to the hook for fixation; The skateboard can rotate relative to the hook to reduce the opening of the hook.
5. The adjustable ladder according to claim 1, characterized in that: It also includes a pad block with a U-shaped cross-section; the bottom of the inner support rod and the bottom of the outer support rod are respectively inserted into the pad block, and the bolt passes through the side wall of the pad block to achieve a hinged connection and fixation with the inner support rod and the outer support rod.
6. The adjustable ladder according to claim 5, characterized in that: A handle is welded to the outer surface of the pad.
7. The adjustable ladder according to claim 1, characterized in that: It also includes a handrail frame; the handrail frame consists of horizontal and vertical tubes, bolts are passed through the horizontal and vertical tubes and nuts are screwed on to fix them, and the top of the handrail frame is spliced into a rectangle; The bottom surface of the vertical tube has two opposing first slots facing upwards; It also includes a first connecting plate, a first bolt and a second bolt respectively passing through both ends of the first connecting plate for fixation, a columnar first limiting sleeve welded to the outer surface of the first connecting plate, a first limiting rod provided inside the bottom of the first limiting sleeve, and a first positioning block fixed to the top outer surface of the first limiting sleeve. The vertical tube is inserted into the first limiting sleeve, the first limiting rod is embedded in the first slot for fixation, and the bolt is screwed into the first positioning block to abut against the vertical tube for fixation.