Slow descending structure of extension ladder
By setting up a slow-down structure in the telescopic ladder and controlling the descent speed of the ladder frame with air flow, the problem of the telescopic ladder falling too quickly is solved and safety is improved.
Patent Information
- Application Number
- CN202422242732.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-12
AI Technical Summary
The existing telescopic ladder descends too fast, which can easily lead to user pinched fingers or smashed injuries, and it needs to be improved to slow down the ladder.
A slow-down structure is designed, including the cavity and slow-down block in the ladder frame. The descent speed of the ladder frame is controlled through air flow, and the air flow aperture is moved under the action of air pressure to adjust the air flow aperture to achieve the slow-down function.
Effectively slow down the speed of the ladder frame, improve the safety performance of the telescopic ladder, avoid finger pinch or smash accidents, and improve the safety of use.
Smart Images
Figure CN223062348U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of telescopic ladders, in particular to a telescopic ladder slow-down structure. Background Art
[0002] The telescopic ladder can be stretched and shortened like a fishing rod. This product is very convenient to carry and store, and can be placed in the closet, study, under the bed at home or in the trunk of a car; its ultra-light weight, ultra-short height, super strong safety, user-friendly design and beautiful appearance make this product sell well all over the world. It is an ideal ladder for high-altitude operations in departments such as families, hotels, shopping malls, enterprises, electric power and telecommunications, urban construction, public security and fire protection, heating and gas supply, and gardening. For the cylinder telescopic ladder, both sides are composed of telescopic cylinders and cylinders. After pulling the telescopic cylinder, under the action of the cylinder, the telescopic cylinder is kept in a telescopic state to achieve the purpose of stretching.
[0003] In the existing telescopic ladder, after the push button is unlocked, the ladder descends and folds up by its own weight. Since the resistance received during the descent of the ladder is very small, each part of the ladder will quickly descend and fold up. If the user's hands are not properly supported and the fingers are exactly between the two cross bars, it is easy to cause a safety accident where the cross bar of the telescopic ladder pinches or injures the user's fingers. The rapid descent of the ladder makes the situation of pinching the fingers more serious. Therefore, this structure needs to be further improved to slow down the descent speed of the ladder. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a telescopic ladder slow-down structure, which solves the problem of too fast descent speed of the ladder through a slow-down block.
[0005] The purpose of the utility model is realized as follows: A telescopic ladder slow-down structure includes a first ladder frame and a second ladder frame that can be telescopically arranged inside its inner circumference. A cavity one is formed inside the first ladder frame, and a cavity two is formed inside the second ladder frame. A cover is installed at the lower end opening of the second ladder frame. An air passing hole is opened in the cover. The cavity one is connected to the cavity two through the air passing hole. An installation seat is arranged at the end face of the air passing hole. A slow-down block that can move up and down is arranged inside the installation seat. A number of through holes one are opened in the slow-down block. A number of through holes two are opened on the side surface of the installation seat. An opening is formed at the lower end of the installation seat.
[0006] Preferably, a limiting ring is installed at the opening of the installation seat, and an annular table surface for the slow-down block to abut against is formed on the inner circumference of the limiting ring.
[0007] Preferably, a buckle part is formed at the lower end of the installation seat, and a buckle hole for the buckle part to be inserted into is opened on the limiting ring.
[0008] Preferably, a connecting portion is formed on the outer periphery of the cover, an elastic clamping portion is formed inside the connecting portion, a clamping block is arranged on the side surface of the elastic clamping portion, and a clamping hole for the clamping block to be inserted into is formed in the second ladder frame.
[0009] Preferably, an annular groove is formed on the outer periphery of the cover, and a sealing ring is arranged in the annular groove.
[0010] Preferably, the aperture of the air passing hole is smaller than the inner diameter of the opening.
[0011] Preferably, the shape of the descending block matches the shape of the inner cavity of the mounting seat, and the descending block is made of filter cotton.
[0012] The outstanding and beneficial technical effects of the utility model compared with the prior art are as follows:
[0013] Through the design of the descending block, the utility model can slow down the descending speed of the ladder frame and improve the safety performance of the telescopic ladder. When the ladder frame is descending, the volume of the first cavity gradually becomes smaller. Therefore, the air inside it will enter the second cavity through the air passing hole. Under the action of air pressure, the descending block will be pushed to move simultaneously, so that it abuts against the end surface of the air passing hole, thereby enabling the air to only slowly enter the second cavity through the through hole with a small aperture in the descending block, so as to slow down the descending speed of the ladder frame and realize the descending function. Description of the Drawings
[0014] Figure 1 It is a three-dimensional structural schematic diagram of a telescopic ladder.
[0015] Figure 2 It is a structural schematic diagram of a ladder frame Figure 1 .
[0016] Figure 3 It is Figure 2 a structural sectional view at A-A in
[0017] Figure 4 It is a structural schematic diagram of a ladder frame Figure 2 .
[0018] Figure 5 It is Figure 4 a structural sectional view at B-B in
[0019] Figure 6 It is a structural schematic diagram when the ladder frame and the cover are combined.
[0020] Figure 7 It is a structural schematic diagram when the ladder frame and the cover are separated.
[0021] Reference numerals: 1 - the first ladder frame; 2 - the second ladder frame; 3 - the first cavity; 4 - the second cavity; 5 - the cover;
[0022] 6 - Air vent hole; 7 - Mounting seat; 8 - Descent - slowing block; 9 - First through - hole; 10 - Second through - hole; 11 - Opening; 12 - Limiting ring; 13 - Annular table surface; 14 - Buckling part; 15 - Buckling hole; 16 - Connecting part; 17 - Elastic buckling part; 18 - Block; 19 - Hole; 20 - Annular groove; 21 - Sealing ring. Specific embodiments
[0023] The following further elaborates on the specific embodiments of the present utility model in conjunction with the accompanying drawings.
[0024] Specifically, Figure 1 , a telescopic ladder descent - slowing structure is composed of multiple telescopic ladder frames sleeved together. Combining Figures 2 - 7 , it includes a first ladder frame 1 and a second ladder frame 2 telescopically arranged inside its inner circumference. A cavity one 3 is formed inside the first ladder frame 1, and a cavity two 4 is formed inside the second ladder frame 2. A cover 5 is installed at the lower - end opening 11 of the second ladder frame 2. An air vent hole 6 is opened inside the cover 5. The cavity one 3 is connected to the cavity two 4 through the air vent hole 6. An end face of the air vent hole 6 is provided with a mounting seat 7. A descent - slowing block 8 that can move up and down is arranged inside the mounting seat 7. A plurality of first through - holes 9 are opened inside the descent - slowing block 8. A plurality of second through - holes 10 are opened on the side surface of the mounting seat 7. An opening 11 is formed at the lower end of the mounting seat 7.
[0025] Through the design of the descent - slowing block, the present utility model can slow down the descending speed of the ladder frame and improve the safety performance of the telescopic ladder. When the ladder frame is descending, the volume of the cavity one 3 gradually becomes smaller. Therefore, the air inside it will enter the cavity two 4 through the air vent hole 6. Under the action of air pressure, combining Figure 5 , it will simultaneously push the descent - slowing block 9 to move, making it abut against the end face of the air vent hole 6. Thus, air can only slowly enter the cavity two 4 through the small - aperture first through - holes 9 inside the descent - slowing block 9, thereby slowing down the descending speed of the ladder frame and realizing the descent - slowing function.
[0026] Combining Figure 3 , when the ladder frame is unfolding, the volume of the cavity two 4 gradually becomes larger. Therefore, the air inside it will enter the cavity one 3 through the air intake hole 6. Under the action of air pressure, it will simultaneously push the descent - slowing block 9 to move, making it away from the air vent hole 6. Thus, air can quickly enter the cavity two 4 through the large - aperture second through - holes 10 and the air vent hole 6, thereby increasing the unfolding speed of the ladder frame.
[0027] A limiting ring 12 is installed at the opening 11 of the mounting seat 7. An annular table surface 13 for the descent - slowing block 8 to abut against is formed on the inner circumference of the limiting ring 12, so as to keep the descent - slowing block 8 moving inside the mounting seat 7.
[0028] A buckle member 14 is formed at the lower end of the mounting base 7, and a buckle hole 15 for inserting the buckle member 14 is formed on the limiting ring 12. The limiting ring 12 is fixed at the opening of the mounting base 7 by buckling. This connection structure is simple and convenient to assemble.
[0029] A connecting portion 16 is formed on the outer periphery of the cover 5. An elastic clamping portion 17 is formed inside the connecting portion 16. A clamping block 18 is arranged on the side surface of the elastic clamping portion 17. A clamping hole 19 for the clamping block 18 to be clamped into is formed in the ladder two 2. Through the cooperation of the clamping block 18 and the clamping hole 19, the cover 5 is installed at the lower end opening of the ladder. This structure is simple and convenient to assemble, improving the assembly efficiency.
[0030] An annular groove 20 is formed on the outer periphery of the cover 5, and a sealing ring 21 is arranged in the annular groove 20. Under the action of the sealing ring, the sealing performance is improved, so that most of the air passes through the air passing hole 6 instead of passing through the gap between the cover 5 and the ladder.
[0031] The aperture of the air passing hole 6 is smaller than the inner diameter of the opening 11. When the ladder descends, the volume of the first cavity 3 gradually becomes smaller. The air inside it will first pass through the opening 11 and the second through hole 10 into the mounting base 7, thereby pushing the slow descent block 9 to abut against the end surface of the air passing hole 6, and then passing through the first through hole 9 and the air passing hole 6 into the second cavity 4.
[0032] The shape of the slow descent block 8 matches the inner cavity shape of the mounting base 7. The slow descent block 8 is made of filter cotton, and a number of small holes are distributed in the filter cotton, which can effectively slow down the flow of air, thereby achieving the slow descent effect.
[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
Claims
1. A telescopic ladder descent structure, characterized in that, It includes a ladder frame one (1) and a ladder frame two (2) that is telescopically arranged inside its inner circumference. A cavity one (3) is formed inside the ladder frame one (1), and a cavity two (4) is formed inside the ladder frame two (2). A cover (5) is installed at the lower end opening (11) of the ladder frame two (2). An air passing hole (6) is formed inside the cover (5). The cavity one (3) is communicated with the cavity two (4) through the air passing hole (6). An installation seat (7) is arranged at the end face of the air passing hole (6). A descending speed reducing block (8) that can move up and down is arranged inside the installation seat (7). A plurality of through holes one (9) are formed inside the descending speed reducing block (8). A plurality of through holes two (10) are formed in the side face of the installation seat (7). An opening (11) is formed at the lower end of the installation seat (7).
2. The telescopic ladder descent structure according to claim 1, characterized in that: A limiting ring (12) is installed at the opening (11) of the installation seat (7). An annular table surface (13) for the descending speed reducing block (8) to abut against is formed on the inner circumference of the limiting ring (12).
3. The telescopic ladder descending structure according to claim 2, wherein: A clamping component (14) is formed at the lower end of the installation seat (7). A clamping hole (15) for the clamping component (14) to be inserted into is formed on the limiting ring (12).
4. The telescopic ladder descending structure according to claim 1, wherein: A connecting part (16) is formed on the outer circumference of the cover (5). An elastic clamping part (17) is formed inside the connecting part (16). A clamping block (18) is arranged on the side face of the elastic clamping part (17). A clamping hole (19) for the clamping block (18) to be clamped into is formed inside the ladder frame two (2).
5. The telescopic ladder descent structure according to claim 1 or 4, characterized in that: An annular groove (20) is formed on the outer circumference of the cover (5). A sealing ring (21) is arranged inside the annular groove (20).
6. The telescopic ladder descent structure according to claim 1, wherein: The aperture of the air passing hole (6) is smaller than the inner diameter of the opening (11).
7. The telescopic ladder descending structure according to claim 1, characterized in that: The shape of the descending speed reducing block (8) matches the shape of the inner cavity of the installation seat (7). The descending speed reducing block (8) is made of filter cotton.