Self-locking positioning structure of herringbone ladder

Abstract

The utility model discloses a kind of self-locking positioning structure of herringbone ladder, it is related to herringbone ladder technical field, including I-shaped fixed frame, I-shaped fixed frame left and right two sides symmetrical fixed installation have sliding rod, two sliding rods side wall are slidably connected with sliding sleeve, two sliding sleeve side wall are fixedly installed with rotating connecting block one to back end, left and right two rotating connecting block one inside rotationally connected with rotating rod, personnel can be rotated by rotating handle drive screw, the rotation of screw drives thread sleeve and two sliding blocks to slide up and down in cross type sliding slot, to be rotated under the action of rotating rod simultaneously with two sides rotating ladder frame, make two sides rotating ladder frame simultaneously unfold or simultaneously retract, and the rotation angle of two sides rotating ladder frame is fixed by the self-locking between screw and thread sleeve, to realize the locking of the rotation angle of two rotating ladder frames of herringbone ladder, improve the safety when herringbone ladder is used.

Description

Technical Field

[0001] This utility model relates to the field of A-frame ladder technology, and in particular to a self-locking positioning structure for an A-frame ladder. Background Technology

[0002] A-frame ladders are a common tool for climbing, mainly used for renovation, repair, or cleaning work in spaces above a flat surface (such as roofs, ceilings, etc.). When using an A-frame ladder, simply unfold it and fix it in one position to find a stable point without needing to lean against a wall or other object. A-frame ladders are also lightweight, making them very convenient to move. An A-frame ladder generally consists of a top plate and two ladder frames that are rotatably connected to the top plate.

[0003] Currently, A-frame ladders typically use nylon straps attached to the two ladder frames to limit the rotation angle between them. However, this connection method cannot securely link the two ladder frames, resulting in poor stability and affecting the safety of the ladder during use. Furthermore, it only allows the ladder to open to a fixed angle and cannot adjust the angle between the two ladder frames.

[0004] Therefore, it is necessary to improve the existing technology to solve the above-mentioned technical problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a self-locking positioning structure for an A-frame ladder, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a self-locking positioning structure for an A-frame ladder, including an I-shaped fixing frame, with sliding rods symmetrically fixedly installed on the left and right sides of the I-shaped fixing frame, and sliding sleeves slidably connected to the side walls of the two sliding rods, with rotating connecting blocks I fixedly installed at the back ends of the side walls of the two sliding sleeves, rotating rods rotatably connected inside the two rotating connecting blocks I, and rotating connecting blocks II rotatably connected to the upper ends of the outer walls of the two rotating rods.

[0007] As a further technical solution of this utility model, the I-shaped fixing frame has a cross-shaped sliding groove in the middle. A screw is rotatably connected between the upper and lower sides of the inner wall of the cross-shaped sliding groove. A threaded sleeve is threadedly connected to the side wall of the screw. A sliding block that slides through the cross-shaped sliding groove is fixedly installed between the threaded sleeve and the two sliding sleeves.

[0008] As a further technical solution of this utility model, a handle is rotatably connected to the lower end of the outer wall of the I-shaped fixing frame, and the upper end of the outer wall of the handle rotatably penetrates the inner wall of the I-shaped fixing frame and is fixedly connected to the screw.

[0009] As a further technical solution of this utility model, a lifting rod is fixedly installed at the front end of the outer wall of the threaded sleeve, a pointer block is fixedly connected to the front end of the outer wall of the lifting rod, and a scale is fixedly installed on the front side of the outer wall of the I-shaped fixing frame.

[0010] As a further technical solution of this utility model, a connecting plate is fixedly connected to the upper end of the outer wall of the I-shaped fixing frame. A threaded mounting hole is provided on the connecting plate. The outer walls of the two rotating connecting blocks on the left and right sides are fixedly connected to connecting plates on the opposite side. Threaded mounting holes are provided on the connecting plates.

[0011] This utility model provides a self-locking structure for an A-frame ladder, which has the following advantages compared with the prior art:

[0012] Beneficial effects:

[0013] 1. In use, this utility model allows the user to rotate the screw by turning the handle. The rotation of the screw causes the threaded sleeve and two sliding blocks to slide up and down in the cross-shaped groove. Under the action of the rotating rod, the two rotating ladder frames on both sides rotate simultaneously, allowing them to unfold or retract at the same time. The rotation angle of the two rotating ladder frames on both sides is fixed by the self-locking between the screw and the threaded sleeve, thereby locking the rotation angle of the two rotating ladder frames of the A-frame ladder and improving the safety of using the A-frame ladder.

[0014] 2. When this utility model is in use, when the threaded sleeve slides up and down, it can drive the lifting rod and the pointer block to slide up and down. The operator can know the accurate rotation angle of the rotating ladder frame according to the scale value pointed to by the pointer block, thereby realizing the precise adjustment of the rotation angle of the rotating ladder frame and improving the convenience of using the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a front view of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the threaded sleeve of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection between the rotating rod and the rotating connecting block 2 of this utility model;

[0019] Figure 5 This is a structural diagram of the connecting plate 1 and connecting plate 2 of this utility model when assembled into the A-frame ladder.

[0020] In the diagram: 1. Top plate; 2. Rotating ladder frame; 100. I-shaped fixing frame; 200. Sliding rod; 210. Sliding sleeve; 220. Rotating connecting block one; 300. Rotating rod; 400. Rotating connecting block two; 500. Cross-shaped slide groove; 510. Screw; 520. Threaded sleeve; 530. Sliding block; 540. Handle; 600. Scale; 610. Lifting rod; 620. Pointer block; 700. Connecting plate one; 710. Threaded mounting hole one; 720. Connecting plate two; 730. Threaded mounting hole two. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5This utility model provides a self-locking positioning structure for an A-frame ladder: it includes an I-shaped fixing frame 100, with a connecting plate 700 fixedly connected to the upper end of the outer wall of the I-shaped fixing frame 100. The connecting plate 700 has a threaded mounting hole 710. The outer walls of the left and right rotating connecting blocks 400 are fixedly connected to connecting plates 720 on the opposite side. The connecting plates 720 have threaded mounting holes 730. The device is connected to the bottom of the top plate 1 of the A-frame ladder through the connecting plate 700 and the threaded mounting hole 710, and is connected to the two rotating ladder frames 2 of the A-frame ladder through the connecting plate 720 and the threaded mounting hole 730. The I-shaped fixing frame 100 has sliding rods 200 symmetrically fixed on both sides. Sliding sleeves 210 are slidably connected to the side walls of the two sliding rods 200. Rotary connecting blocks 1 220 are fixedly installed on the back end of the side walls of the two sliding sleeves 210. Rotary rods 300 are rotatably connected inside the two rotating connecting blocks 1 220. Rotary connecting blocks 2 400 are rotatably connected to the upper end of the outer walls of the two rotating rods 300. The I-shaped fixing frame 100 has a cross-shaped groove 500 in the middle. A screw 510 is rotatably connected between the upper and lower sides of the inner wall of the cross-shaped groove 500. A threaded sleeve 520 is threadedly connected to the side wall of the screw 510. A sliding block 530 that slides through the cross-shaped groove 500 is fixedly installed between the threaded sleeve 520 and the two sliding sleeves 210. The device drives the threaded sleeve 520 and the two sliding blocks 530 to slide up and down in the cross-shaped groove 500 by rotating the screw 510. Thus, under the action of the rotating rod 300, the rotating ladder frames 2 on both sides rotate simultaneously, so that the rotating ladder frames 2 on both sides unfold or retract simultaneously. The rotation angle of the rotating ladder frames 2 on both sides is fixed by the self-locking between the screw 510 and the threaded sleeve 520. A handle 540 is rotatably connected to the lower end of the outer wall of the I-shaped fixing frame 100. The upper end of the outer wall of the handle 540 rotatably passes through the inner wall of the I-shaped fixing frame 100 and is fixedly connected to the screw 510. Personnel can rotate the screw 510 by rotating the handle 540.

[0023] like Figure 1-3 and Figure 5 As shown, a lifting rod 610 is fixedly installed on the front end of the outer wall of the threaded sleeve 520, and a pointer block 620 is fixedly connected to the front end of the outer wall of the lifting rod 610. A scale 600 is fixedly installed on the front side of the outer wall of the I-shaped fixing frame 100. The scale value on the scale 600 corresponds to the rotation angle of the rotating ladder frame 2. When the threaded sleeve 520 slides up and down, it can drive the lifting rod 610 and the pointer block 620 to slide up and down. Personnel can know the accurate rotation angle of the rotating ladder frame 2 according to the scale value pointed to by the pointer block 620, thereby realizing the precise adjustment of the accurate rotation angle of the rotating ladder frame 2.

[0024] The working principle of this utility model is as follows: In use, the device is first connected to the bottom of the top plate 1 of the A-frame ladder through the connecting plate 700 and the threaded mounting hole 710, and is connected to the two rotating ladder frames 2 of the A-frame ladder through the connecting plate 720 and the threaded mounting hole 730. The user can rotate the screw 510 by rotating the handle 540. The device drives the threaded sleeve 520 and the two sliding blocks 530 to slide up and down in the cross-shaped slide groove 500 through the rotation of the screw 510. Thus, under the action of the rotating rod 300, the rotating ladder frames 2 on both sides rotate simultaneously, so that the rotating ladder frames 2 on both sides unfold or retract simultaneously. The rotation angle of the rotating ladder frames 2 on both sides is fixed by the self-locking between the screw 510 and the threaded sleeve 520. At the same time, when the threaded sleeve 520 slides up and down, it can drive the lifting rod 610 and the pointer block 620 to slide up and down. Personnel can know the accurate rotation angle of the rotating ladder 2 according to the scale value pointed to by the pointer block 620 on the scale 600, thereby realizing the precise adjustment of the rotation angle of the rotating ladder 2.

[0025] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A self-locking positioning structure for an A-frame ladder, comprising an I-shaped fixing frame (100), characterized in that: The I-shaped fixing frame (100) has sliding rods (200) symmetrically fixed on its left and right sides. The two sliding rods (200) are slidably connected to the side walls of each sliding sleeve (210). The two sliding sleeves (210) are fixedly installed with rotating connecting blocks (220) one at the back end of their side walls. The two rotating connecting blocks (220) one at the left and right sides are rotatably connected to rotating rods (300). The two rotating rods (300) one at the left and right sides are rotatably connected to rotating connecting blocks (400) two at the upper end of their outer walls.

2. The self-locking positioning structure of the A-frame ladder according to claim 1, characterized in that, The I-shaped fixing bracket (100) has a cross-shaped groove (500) in the middle. A screw (510) is rotatably connected between the upper and lower sides of the inner wall of the cross-shaped groove (500). A threaded sleeve (520) is threadedly connected to the side wall of the screw (510). A sliding block (530) that slides through the cross-shaped groove (500) is fixedly installed between the threaded sleeve (520) and the two sliding sleeves (210).

3. The self-locking positioning structure of the A-frame ladder according to claim 2, characterized in that, The lower end of the outer wall of the I-shaped fixing frame (100) is rotatably connected to a handle (540), and the upper end of the outer wall of the handle (540) rotatably passes through the inner wall of the I-shaped fixing frame (100) and is fixedly connected to the screw (510).

4. The self-locking positioning structure of the A-frame ladder according to claim 2, characterized in that, A lifting rod (610) is fixedly installed on the front end of the outer wall of the threaded sleeve (520), a pointer block (620) is fixedly connected to the front end of the outer wall of the lifting rod (610), and a scale (600) is fixedly installed on the front side of the outer wall of the I-shaped fixing bracket (100).

5. The self-locking positioning structure of the A-frame ladder according to claim 1, characterized in that, The upper end of the outer wall of the I-shaped fixing bracket (100) is fixedly connected to a connecting plate 1 (700), and the connecting plate 1 (700) is provided with a threaded mounting hole 1 (710). The outer walls of the two rotating connecting blocks 2 (400) on the left and right sides are fixedly connected to a connecting plate 2 (720), and the connecting plate 2 (720) is provided with a threaded mounting hole 2 (730).

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