A sliding A-frame ladder

Abstract

This utility model discloses a sliding A-frame ladder, including a first ladder frame and a second ladder frame hinged at their top. The lower section of the longitudinal rods of the first and second ladder frames is hollow and has an inner sleeve rod. The bottom end of the inner sleeve rod extends out and connects to a pulley assembly. A transverse extension is fixed on the outer wall of the bottom end of the longitudinal rod, and a support foot is fixed at one end of the transverse extension rod. A first connector and a through hole for the first connector to pass through are provided on the inner side of the top end of the inner sleeve rod. The two first connectors are connected by a first crossbar. A second connector is provided on the inner side of the longitudinal rod below the first connector. A tension spring connects the first connector and the second connector. When the A-frame ladder is unfolded or unfolded, a person steps on the first crossbar / second crossbar, the pulley assembly contacts the ground, the tension spring pulls the first ladder frame / second ladder frame upward and the support foot is suspended in the air. When a person steps on the transverse rod of the first ladder frame / second ladder frame, the support foot and the pulley simultaneously touch the ground. The person can work stably on the ladder and can slide and turn.

Description

Technical Field

[0001] This utility model belongs to the technical field of A-frame ladders, specifically relating to a sliding A-frame ladder. Background Technology

[0002] Typically, when a person stands on a traditional A-frame ladder, the ladder cannot be moved or turned, limiting their work to a limited area. Changing work surfaces requires folding the ladder, carrying it by hand, and then unfolding it again – laborious and inefficient. Installing pulleys directly at the bottom of the ladder for movement increases instability and danger. While some engineers can move the ladder using a stilt-like motion, this is strenuous, extremely dangerous, and can damage the ground. Some traditional A-frame ladders now feature two pulleys, but these are only suitable for dragging when folded; they cannot be unfolded, or, when unfolded, can be used for sliding or turning while standing on the ladder. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems by providing a sliding A-frame ladder, thus resolving the issue that the ladder cannot slide or turn when unfolded or when a person is standing on it. Furthermore, when the pulleys are controllable motor-driven wheels, or when someone nearby pushes the ladder, or when workers on the ladder use other tools (such as support poles) or anchors within easy reach of the ladder's edge for support, it is possible for a person to move from the A-frame ladder to the next work surface.

[0004] This utility model is achieved through the following technical solution: a sliding A-frame ladder, comprising a first ladder frame and a second ladder frame hinged together at their top ends. The lower sections of the longitudinal bars of the first and second ladder frames are hollow and each has an inner sleeve bar. The bottom ends of the inner sleeve bars protrude from the bottom ends of the longitudinal bars and are respectively connected to pulley assemblies. A transverse extension is fixed to the outer wall of the bottom end of the longitudinal bars of the first and second ladder frames, and a support leg is fixed to the end of the transverse extension that is away from the pulley assembly. The inner sides of the top ends of the inner sleeve bars in the first and second ladder frames are respectively connected to the first connecting members that can protrude from the inner sides of the longitudinal bars. The longitudinal rods of the frame are provided with through holes for the first connecting member to pass through and move up and down; the first connecting members of the two inner sleeve rods of the first ladder frame are connected by a first crossbar, and the first connecting members of the two inner sleeve rods of the second ladder frame are connected by a second crossbar; a second connecting member is also provided on the inner side of the longitudinal rods of the first and second ladder frames respectively, the second connecting member is located below the first connecting member, and a tension spring is connected between the first and second connecting members; when no one steps on the A-frame ladder to apply force, the pulley assembly contacts the ground, and the tension spring pulls the first / second ladder frame upward through the second connecting member, and the legs are suspended in the air.

[0005] Furthermore, the top of the first ladder is axially connected to a flipping bracket, which flips upward and is in the same plane as the first ladder.

[0006] Furthermore, a safety connector for limiting the maximum unfolding angle is provided between the middle of the first ladder and the second ladder. The safety connector is a safety rope or a safety hinge.

[0007] Furthermore, the bottom end of the support leg is provided with an anti-slip pad.

[0008] Furthermore, a foldable pedal is provided between the upper parts of the first and second ladder frames. The foldable pedal includes a pedal body, a first mounting shaft, a second mounting shaft, and a swing connecting rod. The first mounting shaft is fixed to the upper end of the first ladder frame, and the second mounting shaft is fixed to the second ladder frame at a position symmetrical to the first mounting shaft. One end of the pedal body is pivotally connected to the first mounting shaft, and the other end has a slot for cooperating with the second mounting shaft. The middle side of the pedal body is pivotally connected to the end of the swing connecting rod, and the end of the swing connecting rod that is relatively away from the first mounting shaft is pivotally connected to the second mounting shaft. The length of the swing connecting rod is equal to half the length of the pedal body.

[0009] Furthermore, the bottom end of the inner sleeve rod is provided with a limiting baffle. The lower surface of the limiting baffle is fixedly connected to the top end of the pulley assembly, and the center of the upper surface of the limiting baffle is fixedly connected to the bottom end of the inner sleeve rod. There is always a movable gap between the upper surface of the limiting baffle and the edge of the opening at the bottom end of the longitudinal rod of the first ladder / second ladder.

[0010] Furthermore, the pulley assembly consists of a one-way wheel and a swivel wheel.

[0011] Furthermore, the first and second ladder frames are fixed with side steps located above the first and second crossbars, and the length of the side steps is less than half the length of the first and second crossbars.

[0012] When the A-frame ladder of this utility model is unfolded or when a person steps on the first / second horizontal bar after unfolding, the pulley assembly contacts the ground, and the tension spring pulls the first / second ladder frame upward while the support legs are suspended in the air. When a person steps on the horizontal bar of the first / second ladder frame, the support legs and pulleys simultaneously touch the ground, ensuring the stability of the person working on the ladder while realizing the functions of sliding and turning. The movement is labor-saving and flexible, and the workers do not need to return to the ground to move the A-frame ladder to the next work surface before climbing the ladder to work again. It also takes into account the safety of people working on the A-frame ladder. Attached Figure Description

[0013] Figure 1 This is a side view of the A-frame ladder of this utility model in its fully unfolded state; Figure 2This is a front structural diagram of the first ladder frame of this utility model in a movable state; Figure 3 This is a front structural diagram of the first ladder frame of this utility model in an immovable state; Figure 4 This is a front structural diagram of the first crossbar, inner sleeve bar, and pulley assembly of this utility model in their combined state; Figure 5 This is a schematic diagram of the side structure of the A-frame ladder in its folded-up state.

[0014] The attached figures are labeled as follows: 11. First ladder frame; 111. Flip-over bracket; 12. Second ladder frame; 122. Second connector; 123. Tension spring; 124. Safety connector; 125. Side pedal; 13. Lateral extension; 14. Support leg; 141. Anti-slip mat; 21. First crossbar; 22. Second crossbar; 221. Inner sleeve rod; 223. Pulley assembly; 2231. One-way wheel; 2232. Universal wheel; 224. First connector; 225. Limiting baffle; 3. Foldable pedal; 31. Pedal body; 311. Slot; 32. First mounting shaft; 33. Second mounting shaft; 34. Swing connecting rod. Detailed Implementation

[0015] The present invention will be further illustrated below with reference to specific examples and accompanying drawings.

[0016] like Figures 1-5As shown, this utility model describes a sliding A-frame ladder, including a first ladder frame 11 and a second ladder frame 12 hinged at their top ends. The lower sections of the longitudinal bars of the first ladder frame 11 and the second ladder frame 12 are hollow and each has an inner sleeve rod 221. The bottom ends of the inner sleeve rods 221 extend through the bottom ends of the longitudinal bars and are respectively connected to pulley assemblies 223. A transverse extension member 13 is fixed to the outer wall of the bottom end of the longitudinal bars of the first ladder frame 11 and the second ladder frame 12. A support leg 14 is fixed to the end of the transverse extension member 13 that is away from the pulley assembly 223. The inner sides of the top ends of the inner sleeve rods 221 in the first ladder frame 11 and the second ladder frame 12 are respectively connected to the inner sides of the longitudinal bars, and the inner sides of the longitudinal bars of the first ladder frame 11 and the second ladder frame 12 are provided with... There is a through hole through which the first connecting member 224 passes and moves up and down; and the first connecting members 224 of the two inner sleeve rods 221 of the first ladder frame 11 are connected by a first crossbar 21, and the first connecting members 224 of the two inner sleeve rods 221 of the second ladder frame 12 are connected by a second crossbar 22; a second connecting member 122 is also provided on the inner side of the longitudinal rods of the first ladder frame and the second ladder frame respectively. The second connecting member is located below the first connecting member 224, and a tension spring 123 is connected between the first connecting member 224 and the second connecting member 122. When no one steps on the A-frame ladder to apply force, the pulley assembly 223 contacts the ground, and the tension spring 123 pulls the first ladder frame 11 / second ladder frame 12 upward through the second connecting member 122, and the support leg 14 is in a suspended state.

[0017] Under normal conditions, the A-frame ladder can be folded and stored or unfolded through the hinge at the top of the first ladder frame 11 and the second ladder frame 12. When no one is stepping on the ladder, the pulley assembly 223 remains grounded, while the support leg 14 remains suspended and does not contact the ground under the action of the tension spring 123. Therefore, the A-frame ladder can be easily moved by the pulley assembly 223 after folding or unfolding. Before use, the first ladder frame 11 and the second ladder frame 12 are separated and unfolded. When the operator steps on the first ladder frame 11 or the second ladder frame 12, the tension spring 123 is deformed and stretched by the operator's own weight, causing the support leg 14 to move downwards until it touches the ground. Therefore, when the operator steps on the first ladder frame 11 or the second ladder frame 12, the support leg 14 remains grounded and is stably grounded under the pressure of the operator's weight and the support of the unfolded first ladder frame 11 and the second ladder frame 12, thus limiting the pulley assembly 223. The A-frame ladder can be moved so that it can automatically switch its mobility according to the usage status. When the operator steps up onto the first crossbar 21 or the second crossbar 22 (the force applied to the tension spring 123 is equivalent to coming down from the A-frame ladder), the downward pulling force on the tension spring 123 disappears, and the elastic potential energy of the tension spring 123 is converted into kinetic potential energy, which drives the support leg 14 to pull up and return to the initial suspended position. The operator can switch to the movable mode without getting off the ladder, which is convenient for moving during use. Compared with the existing A-frame ladders, which are inconvenient because the operator can only get off the ladder and then fold it up and move it through the pulley, the A-frame ladder of this utility model can slide when it is unfolded or when a person stands on the first crossbar 21 and the second crossbar 22. The movement is labor-saving and flexible. The operator does not need to return to the ground to move the A-frame ladder to the next work surface and then climb the ladder to work. It also takes into account the safety of the operator when working on the A-frame ladder.

[0018] Based on this, when the pulley is a controllable motor-driven wheel, or when someone pushes the A-frame ladder from the side, or when workers on the ladder use other tools (such as support poles) or anchors within reach of the ladder to pull it up, it is possible for a person to stand on the A-frame ladder and move to the next work surface.

[0019] like Figure 1 As shown, in order to provide support for workers when changing positions on the A-frame ladder, a flip bracket 111 is connected to the top of the first ladder frame 11. After the flip bracket 111 flips upward, it is on the same plane as the first ladder frame 11. It can be used for support and gripping or for hanging toolboxes for easy access to tools, ensuring safety and convenience during use.

[0020] In this embodiment of the present invention, a safety connector 124 for limiting the maximum unfolding angle is provided between the middle of the first ladder 11 and the second ladder 12. The safety connector 124 is a safety rope or a safety hinge. When the first ladder 11 and the second ladder 12 are unfolded, the safety connector 124 pulls the two sides together, thereby enhancing the stability and safety when unfolded and used.

[0021] Furthermore, to prevent the support leg 14 from slipping on a smooth surface and affecting its stability, the bottom of the support leg 14 is provided with an anti-slip pad 141.

[0022] In this embodiment of the present invention, a foldable step 3 is provided between the upper parts of the first ladder 11 and the second ladder 12. The foldable step 3 includes a step body 31, a first mounting shaft 32, a second mounting shaft 33, and a swing connecting rod 34 (please refer to...). Figure 5 The first mounting shaft 32 is fixed to the upper end of the first ladder frame 11, and the second mounting shaft 33 is fixed to the second ladder frame 12 at a position symmetrical to the first mounting shaft 32. One end of the step body 31 is pivotally connected to the first mounting shaft 32, and the other end has a slot 311 for use with the second mounting shaft 33. The end of the swing connecting rod 34 is pivotally connected to the middle of the side of the step body 31. The end of the swing connecting rod 34, which is relatively away from the first mounting shaft 32, is pivotally connected to the second mounting shaft 33. The length of the swing connecting rod 34 is equal to half the length of the step body 31. When the A-frame ladder is unfolded... In use, one end of the swing connecting rod 34 moves away from the first ladder 11 along with the second ladder 12. The pedal body 31 rotates along the first mounting shaft 32 under the pull of the swing connecting rod 34 until the swing connecting rod 34 and the pedal body 31 are parallel to each other. At this time, the slot 311 on the pedal body 31 automatically engages with the second mounting shaft 33. Since the first mounting shaft 32 and the second mounting shaft 33 are symmetrically arranged, the pedal body 31 is placed horizontally after being fully unfolded, so that the operator can step on or straddle the pedal body 31 to maintain stability, and it is also convenient to place tools so that they are not easy to roll off.

[0023] like Figure 2-4As shown, in this embodiment of the present invention, a limiting baffle 225 is provided at the bottom end of the inner sleeve rod 221. The lower surface of the limiting baffle 225 is fixedly connected to the top end of the pulley assembly 223, and the center of the upper surface of the limiting baffle 225 is fixedly connected to the bottom end of the inner sleeve rod 221. There is always a movable gap between the upper surface of the limiting baffle 225 and the edge of the opening at the bottom end of the longitudinal rod of the first ladder 11 / second ladder 12. When the pulley assembly 223 is grounded and the support leg 14 is suspended, the lower end of the inner sleeve rod 221 extends downwards out of the opening at the bottom end of the first ladder 11 / second ladder 12. The upper surface of the limiting baffle 225 is fixedly connected to the edge of the opening at the bottom end of the longitudinal rod of the first ladder 11 / second ladder 12. The movement gap at the bottom opening edge of the rod is relatively large. When the support leg 14 moves down and touches the ground, the lower end of the inner sleeve rod 221 retracts relatively. The gap between the upper surface of the limiting component and the bottom opening edge of the longitudinal rod of the first ladder 11 / second ladder 12 gradually decreases. If the ground level of the four support legs 14 is different, the movement gap corresponding to the different support legs 14 will also change accordingly. It can effectively adapt to different usage environments and maintain good support stability. The interval of the limiting baffle 225 can also prevent the bottom end of the longitudinal rod from putting pressure on the connection between the pulley assembly 223 and the inner sleeve rod 221, which would cause the pulley assembly 223 to loosen and affect its service life.

[0024] In this utility model, the pulley assembly 223 consists of a one-way wheel 2231 and a universal wheel 2232. In some specific embodiments, such as... Figure 1 As shown, the pulley assembly 223 at the bottom of the inner sleeve rod 221 connected to the first crossbar 21 can be set as a one-way wheel 2231, and the pulley assembly 223 at the bottom of the inner sleeve rod 221 connected to the second crossbar 22 can be set as a universal wheel 2232. In use, the operator usually steps onto the A-frame ladder from the first ladder frame 11. As the side that applies force first, the one-way wheel 2231 has relatively little movement and is more stable when the operator first steps on it. After the operator has fully climbed the A-frame ladder, the stability of the support leg 14 is released by stepping on the first crossbar 21 / second crossbar 22. The universal wheel 2232 at the bottom of the inner sleeve rod 221 connected to the second crossbar 22, in conjunction with the one-way wheel 2231, can realize the turning movement. It is convenient to operate and highly practical.

[0025] When the worker steps on the first crossbar 21 and the second crossbar 22 while climbing the ladder, the worker's weight is mainly distributed by the pulley assembly 22, resulting in poor overall stability of the A-frame ladder and potential safety hazards. Therefore, in this embodiment of the invention, a side step 125 is fixed on the first ladder frame 11 and the second ladder frame 12, located above the first crossbar 21 and the second crossbar 22. The length of the side step 125 is less than half the length of the first crossbar 21 / second crossbar 22. The side step 125 is fixed above the first connecting member 224 and will not affect the relative movement of the first connecting member 224 in the through hole. At this height, the worker can continuously apply pressure to the tension spring 123 by stepping on the side step 125 to maintain the stability of the A-frame ladder, which is convenient for working at higher positions while ensuring stability. In addition, the length of the side step 125 is less than half the length of the first crossbar 21 / second crossbar 22 to prevent the middle of the first crossbar 21 / second crossbar 22 from being blocked and inaccessible.

[0026] The above embodiments are merely preferred embodiments of the present utility model and are only used to explain the present utility model, not to limit the present utility model. Any changes, substitutions, combinations, simplifications, modifications, etc., made by those skilled in the art without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A sliding A-frame ladder, characterized in that: The system includes a first ladder (11) and a second ladder (12) hinged at their top ends. The lower sections of the longitudinal rods of the first ladder (11) and the second ladder (12) are hollow and each has an inner sleeve rod (221). The bottom ends of the inner sleeve rods (221) extend through the bottom ends of the longitudinal rods and are connected to pulley assemblies (223). A transverse extension (13) is fixed to the outer wall of the bottom ends of the longitudinal rods of the first ladder (11) and the second ladder (12). A support leg (14) is fixed to the end of the transverse extension (13) that is away from the pulley assembly (223). The inner sides of the top ends of the inner sleeve rods (221) in the first ladder (11) and the second ladder (12) are respectively connected to a first connector (224) that can extend through the inner side of the longitudinal rod. The inner sides of the longitudinal rods of the first ladder (11) and the second ladder (12) are provided for the first connector (224). A through hole that extends and moves up and down; and the first connecting parts (224) of the two inner sleeve rods (221) of the first ladder frame (11) are connected by the first crossbar (21), and the first connecting parts (224) of the two inner sleeve rods (221) of the second ladder frame (12) are connected by the second crossbar (22); a second connecting part (122) is also provided on the inner side of the longitudinal rod of the first ladder frame and the second ladder frame respectively. The second connecting part is located below the first connecting part (224), and a tension spring (123) is connected between the first connecting part (224) and the second connecting part (122). When no one steps on the A-frame ladder to apply force, the pulley assembly (223) contacts the ground, and the tension spring (123) pulls the first ladder frame (11) / second ladder frame (12) up through the second connecting part (122) and the support leg (14) is in a suspended state.

2. The sliding A-frame ladder according to claim 1, characterized in that: The top of the first ladder (11) is axially connected to a flipping bracket (111), which flips upward and is in the same plane as the first ladder (11).

3. The sliding A-frame ladder according to claim 1, characterized in that: A safety connector (124) for limiting the maximum unfolding angle is provided between the middle of the first ladder (11) and the second ladder (12). The safety connector (124) is a safety rope or a safety hinge.

4. A sliding A-frame ladder according to claim 1, characterized in that: The bottom end of the support leg (14) is provided with an anti-slip pad (141).

5. A sliding A-frame ladder according to claim 1, characterized in that: A foldable pedal (3) is provided between the upper parts of the first ladder (11) and the second ladder (12). The foldable pedal (3) includes a pedal body (31), a first mounting shaft (32), a second mounting shaft (33), and a swing connecting rod (34). The first mounting shaft (32) is fixed at the upper end of the first ladder (11), and the second mounting shaft (33) is fixed at a position on the second ladder (12) that is symmetrical to the first mounting shaft (32). One end of the pedal body (31) is shafted to the first mounting shaft (32), and the other end is provided with a slot (311) for use with the second mounting shaft (33). The middle side of the pedal body (31) is shafted to the end of the swing connecting rod (34). The end of the swing connecting rod (34) that is relatively far away from the first mounting shaft (32) is shafted to the second mounting shaft (33). The length of the swing connecting rod (34) is equal to half the length of the pedal body (31).

6. A sliding A-frame ladder according to claim 1, characterized in that: The bottom end of the inner sleeve rod (221) is provided with a limiting baffle (225). The lower surface of the limiting baffle (225) is fixedly connected to the top end of the pulley assembly (223). The center of the upper surface of the limiting baffle (225) is fixedly connected to the bottom end of the inner sleeve rod (221). There is always a movable gap between the upper surface of the limiting baffle (225) and the edge of the opening at the bottom end of the longitudinal rod of the first ladder (11) / second ladder (12).

7. A sliding A-frame ladder according to claim 1, characterized in that: The pulley assembly (223) consists of a one-way wheel (2231) and a universal wheel (2232).

8. A sliding A-frame ladder according to claim 1, characterized in that: Side steps (125) are fixed on the first ladder (11) and the second ladder (12) above the first crossbar (21) and the second crossbar (22), and the length of the side steps (125) is less than half the length of the first crossbar (21) / the second crossbar (22).

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