High-stability extension ladder

Abstract

The utility model discloses a high-stability extension ladder which comprises an inner pipe and an outer pipe movably matched with the inner pipe, a coating piece is arranged on the outer wall of the inner pipe; a limiting piece matched with the wrapping piece is fixedly arranged on the outer pipe, and when the wrapping piece abuts against the limiting piece, the inner pipe is limited; the utility model provides the inner pipe wrapping piece which can be quickly mounted and dismounted, the extension ladder is limited during extension through a limiting structure between the inner pipe wrapping piece and the outer pipe, meanwhile, the sliding damping between the outer pipe wrapping piece and the outer pipe can be reduced through the wrapping piece, and meanwhile, a sliding gap is eliminated, so that the extension ladder is more stable in use after the outer pipe and the inner pipe of the extension ladder extend.

Description

Technical Field

[0001] The utility model relates to the technical field of ladders, in particular to a high-stability telescopic ladder. Background Art

[0002] A telescopic ladder is a ladder that can be extended for use and shortened for storage through the relative extension and contraction of an inner tube and an outer tube. It has been widely used in real life because of its high convenience and is used in both industrial production and daily life.

[0003] Existing telescopic ladders are usually made of metal. In the design of the telescopic structure, a convex portion is provided on the inner tube and a limiting step is provided on the outer tube so that the inner tube is restricted from sliding after being extended to a certain extent relative to the outer tube. However, this arrangement still has the following disadvantages:

[0004] 1. When the restriction parts are set on the inner tube and the outer tube, the molding process is complicated, the production cost is high, and the efficiency is also low during mass production;

[0005] 2. There is a sliding gap between the inner tube and the outer tube, and the resistance between the metal pipes is large when they slide relative to each other, which is not conducive to the relative telescopic sliding between the inner tube and the outer tube. Utility Model Content

[0006] The utility model aims at the deficiencies in the prior art and provides a telescopic ladder with high stability.

[0007] In order to solve the above technical problems, the utility model solves them through the following technical solutions: a high-stability telescopic ladder comprises an inner tube and an outer tube movably matched with the inner tube.

[0008] In the above solution, preferably, a covering member is provided on the outer wall of the inner tube;

[0009] The outer tube is fixedly provided with a limiting piece matched with the covering piece, and when the covering piece abuts against the limiting piece, the inner tube is limited.

[0010] In the above solution, preferably, the thickness of the covering member is adapted to the gap between the inner tube and the outer tube to prevent shaking of the two after assembly.

[0011] In the above solution, preferably, the covering member is provided with one or more mounting parts, and the inner tube is provided with mounting holes matched with the mounting parts.

[0012] In the above scheme, preferably, the covering member is an annular member, which is circumferentially arranged on the outer wall of the inner tube and includes a separation groove that causes it to deform under force.

[0013] In the above solution, preferably, the covering member is made of a plastic material having elastic deformation and restoring capabilities.

[0014] In the above solution, preferably, the limiting member includes a fixing sleeve matched with the outer tube, and the fixing sleeve is provided with a convex ring for limiting the sliding of the covering member.

[0015] In the above scheme, preferably, the fixing sleeve is provided with a plurality of fixing blocks protruding toward the wall of the outer tube, and the outer tube is provided with fixing holes matched with the fixing blocks.

[0016] In the above scheme, preferably, the limiting member includes a locking portion, a locking pin is slidably provided in the locking portion, and the inner tube is provided with a pin hole penetrated by the locking pin after sliding.

[0017] In the above solution, preferably, the covering member is provided with an opening matched with the pin hole.

[0018] In the above scheme, preferably, one end of the inner tube slides through the outer tube, and the other end is fixed with a support sleeve, a plurality of positioning holes are provided on the wall of the inner tube, and a positioning block matching the positioning holes is provided on the support sleeve.

[0019] The beneficial effects of the utility model are as follows: the utility model provides an inner tube covering component that can be quickly installed and disassembled, and the telescopic ladder is limited when being extended or retracted through the limiting structure between the inner tube and the inner tube, and the sliding damping between the inner tube and the outer tube can be reduced by the covering component, and the sliding gap can be eliminated, so that the outer tube and the inner tube of the telescopic ladder are more stable when used after being extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the utility model.

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0022] Figure 3 It is a partial enlarged structural schematic diagram of point A of the utility model.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the inner tube of the utility model.

[0024] Figure 5 It is a schematic diagram of the explosion structure of the utility model.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the covering member of the utility model. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figure 1-Figure 6 A high-stability telescopic ladder comprises an inner tube 1 and an outer tube 2 slidably matched therewith, wherein one end of the inner tube 1 is penetrated by the outer tube 2.

[0027] A limiting member 4 is fixedly provided at one end of the outer tube 2, and the limiting member 4 includes a fixing sleeve 401 and a locking portion 5. The fixing sleeve 401 and the locking portion 5 are integrally formed. The fixing sleeve 401 is fixedly sleeved at the end of the outer tube 2, and a convex ring 402 which converges toward the center of the outer tube 2 is provided on the fixing sleeve 401. After passing through the outer tube 2, one end of the inner tube 1 can pass through the inner hole of the convex ring 402 and then pass out.

[0028] A plurality of fixing blocks 403 protruding toward the wall of the outer tube 2 are provided on the inner side of the fixing sleeve 401, and a plurality of fixing holes 404 cooperating with the fixing blocks 403 and penetrating the wall are provided on the wall of the outer tube 2, that is, the fixing sleeve 401 is clamped in the fixing hole 404 through the fixing blocks 403, thereby achieving fixation between the fixing sleeve 401 and the locking portion 5 and the end of the outer tube 2.

[0029] In this embodiment, in order to achieve the locking of the inner tube 1 and the outer tube 2 after extension, a slidable locking pin 501 is provided in the locking portion 5. Figure 3 When the locking pin 501 is slidably mounted on the locking portion 5, the locking pin 501 is inserted into the fixing sleeve 401 and the outer tube 2, and the other end of the locking pin 501 is pressed against the locking portion 5 by a spring 504. The wall of the inner tube 1 is provided with a pin hole 502 which can cooperate with the locking pin 501 after sliding. That is, when the inner tube 1 slides upward after passing through the outer tube 2, the end of the locking pin 501 presses against the outer wall of the inner tube 1. When the locking pin 501 slides to the corresponding position with the pin hole 502, the end of the locking pin 501 can be inserted into the pin hole 502 by the elastic force of the spring 504, so that the locking portion 5 and the inner tube 1 are relatively locked. A limiting plate is provided on the pin rod of the locking pin 501, and the limiting plate presses against the wall of the locking portion 5 after the locking pin 501 is inserted into the pin hole 502. In addition, the locking pin 501 can be manually pushed after a push block is installed on the rod body, so as to realize the locking and unlocking between the locking pin 501 and the pin hole 502 after the locking pin 501 slides horizontally.

[0030] In this embodiment, in order to prevent the inner tube 1 from slipping off the outer tube 2 during the stretching process after passing through the outer tube 2, a covering member 3 is provided on the outer tube wall of the inner tube 1. Figure 6 As shown, the covering member 3 is an annular component, which is circumferentially arranged on the outer wall of the inner tube 1, and the outer wall of the covering member 3 is slidably matched with the inner wall of the outer tube 2, so that the sliding gap between the inner wall of the outer tube 2 and the outer wall of the inner tube 1 is reduced, thereby improving the sliding stability of the inner tube 1 and the stability of the ladder when in use.

[0031] The covering member 3 is arranged on the tube wall at the pin hole 502. When the inner tube 1 passes through the convex ring 402 of the fixing sleeve 401 and continues to slide, the end surface of the covering member 3 close to the convex ring 402 can be pressed against the convex ring 402, thereby limiting the continuous sliding of the inner tube 1 relative to the outer tube 2.

[0032] like Figure 5-6As shown, the covering member 3 is arranged to cover the outer wall of the inner tube 1, and when the covering member 3 abuts against the limiting member 4, the inner tube 1 is limited; the thickness of the covering member 3 is adapted to the gap between the inner tube 1 and the outer tube 2 to prevent the two from shaking after assembly; specifically, the inner hole of the covering member 3 fits the outer wall of the inner tube 1, and one or more mounting portions 301 protruding toward the center of the inner tube 1 are provided on the wall of the inner hole, and mounting holes 302 that are adapted to the number and orientation of the mounting portions 301 are penetrated on the tube wall of the inner tube 1, so that the mounting portions 301 are clamped in the mounting holes 302, thereby realizing axial and circumferential fixation of the covering member 3.

[0033] The covering member 3 is made of a plastic material with elastic deformation and reset capabilities, such as elastic ABS material, which can improve the wear resistance of the covering member 3, and the outer wall of the covering member 3 is a smooth surface, thereby reducing the sliding damping between the covering member 3 and the inner wall of the outer tube 2. In order to facilitate the disassembly and assembly of the covering member 3, a separation groove 303 is provided on the covering member 3, and the groove width of the separation groove 303 is preferably set to be more than 0.5 mm, that is, the covering member 3 is cut, and after the covering member 3 is separated to both sides through the separation groove 303, the covering member 3 is elastically deformed, and at the same time the mounting portion 301 is disengaged from the mounting hole 302, and the entire covering member 3 is separated from the outer wall of the inner tube 1, and then after the separation force disappears, the covering member 3 relies on its own elastic reset ability to recover to Figure 6 Status shown.

[0034] In this embodiment, in order to facilitate the plug-in cooperation between the pin hole 502 and the locking pin 501, an opening 503 matched with the pin hole 502 is provided on the covering member 3, that is, after the covering member 3 covers the inner tube 1, an opening which passes through the pin hole 502 is provided thereon to facilitate the plug-in of the locking pin 501. At the same time, a hole body for the locking pin 501 to pass through is provided on the fixing sleeve 401 and the outer tube 2, so as to realize the smooth sliding of the locking pin 501.

[0035] In this embodiment, in order to make the inner tube 1 slide more smoothly and stably in the outer tube 2, a support sleeve 6 is provided on the inner tube 1. Specifically, one end of the inner tube 1 passes through the inner holes of the outer tube 2 and the convex ring 402, and the other end is fixed with a support sleeve 6. A plurality of positioning holes 601 are provided on the tube wall of the end of the inner tube 1, and a positioning block 602 matched with the positioning hole 601 is provided on the support sleeve 6. The positioning block 602 protrudes toward the tube wall of the inner tube 1 and is embedded in the positioning hole 602 to fix the support sleeve 6.

[0036] The outer wall of the support sleeve 6 is slidably fitted with the inner wall of the outer tube 2, and the gap therebetween is set to be the same or similar to the gap between the covering member 3 and the inner wall of the outer tube 2, so that when the inner tube 1 and the outer tube 2 are slidably fitted, sliding support is obtained at two places, namely, the covering member 3 and the support sleeve 6, thereby improving the sliding stability of the inner tube 1 and the outer tube 2 and the support stability of the inner tube 1 after extension (i.e., after the ladder is extended).

[0037] A method for using a high-stability telescopic ladder as described above: one end of the inner tube 1 is passed through the convex ring 402 of the outer tube 2 and then slid upward, at which time the covering member 3 on the tube body of the inner tube 1 slides relatively and fits with the inner wall of the outer tube 2, and when the covering member 3 slides to the convex ring 402 and abuts against it, the inner tube 1 is restricted from sliding, and the locking pin 501 slides transversely and is inserted into the pin hole 502 under the action of the spring, so that the inner tube 1 and the outer tube 2 are relatively fixed, and in addition, the outer wall of the supporting sleeve 6 of the inner tube 1 is placed in the outer tube 2, so that the inner tube 1 and the outer tube 2 are more stable after relative extension;

[0038] When unlocking, the lock pin 501 is manually pushed to compress the spring 504 and then the end of the spring 504 slides out of the pin hole 502, thereby shortening the inner tube 1 relative to the outer tube 2, thereby realizing the extension and retraction of the ladder.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high stability telescopic ladder, characterized by: It comprises an inner tube (1) and an outer tube (2) movably matched therewith; A covering member (3) is provided on the outer wall of the inner tube (1); The outer tube (2) is fixedly provided with a limiting piece (4) that matches the covering piece (3); when the covering piece (3) abuts against the limiting piece (4), the inner tube (1) is limited.

2. A high stability telescopic ladder according to claim 1, characterized in that: The thickness of the covering member (3) is adapted to the gap between the inner tube (1) and the outer tube (2) to prevent the two from shaking after being assembled.

3. The high stability telescopic ladder according to claim 1, characterized in that: The covering member (3) is provided with one or more mounting portions (301), and the inner tube (1) is provided with mounting holes (302) that are compatible with the mounting portions (301).

4. The high stability telescopic ladder according to claim 1, characterized in that: The covering member (3) is an annular member, which is arranged circumferentially on the outer wall of the inner tube (1) and includes a separation groove (303) that causes it to deform under force.

5. A high stability telescopic ladder according to claim 4, characterized in that: The covering component (3) is made of a plastic material having elastic deformation and restoring capabilities.

6. The high stability telescopic ladder according to claim 1, characterized in that: The limiting member (4) comprises a fixing sleeve (401) matched with the outer tube (2), and the fixing sleeve (401) is provided with a convex ring (402) for limiting the sliding of the covering member (3).

7. A high stability telescopic ladder according to claim 6, characterized in that: The fixing sleeve (401) is provided with a plurality of fixing blocks (403) protruding toward the wall of the outer tube (2), and the outer tube (2) is provided with fixing holes (404) matching the fixing blocks (403).

8. The high stability telescopic ladder according to claim 1, characterized in that: The position-limiting member (4) comprises a locking portion (5), a locking pin (501) being slidably disposed inside the locking portion (5), and a pin hole (502) through which the locking pin (501) penetrates after sliding is provided on the inner tube (1).

9. A high stability telescopic ladder according to claim 8, characterized in that: The covering piece (3) is provided with an opening (503) matching the pin hole (502).

10. The high stability telescopic ladder according to claim 1, characterized in that: One end of the inner tube (1) is slidably inserted into the outer tube (2), and the other end is fixedly provided with a support sleeve (6). A plurality of positioning holes (601) are provided on the wall of the inner tube (1), and a positioning block (602) matching the positioning holes (601) is provided on the support sleeve (6).

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