Safety telescopic ladder capable of being automatically gathered in slow descending mode under action of air resistance

Abstract

The invention discloses a safety telescopic ladder capable of being automatically gathered in a slow descending mode under the action of air resistance. The safety telescopic ladder is characterized by being formed by serially stacking a plurality of sub-ladders (1) from the bottom to top, and the telescopic ladder comprises the sub-ladders (1), pin locking devices (2), piston plugs (3), O-shaped seal rings (4), top sleeves (5), foot pads (6) and a bottom sub-ladder (7). In the adopted technical scheme of the invention, the piston plugs of which the peripheries are equipped with the O-shaped seal rings are fixedly arranged on the bottoms of telescopic columns of the sub-ladders above the bottom sub-ladder of the telescopic ladder, the closed foot pads are arranged on the lower end of the bottom sub-ladder, and the descending and gathering speed of each sub-ladder is reduced by means of the air resistance action generated by the cylinder effect of the O-shaped seal rings and the piston plugs when the telescopic columns of the sub-ladders move downwards. Thus, the invention overcomes the problem and defect that fingers of a user are easily injured in the prior art; and meanwhile, the telescopic ladder can be safely gathered in a slow descending mode under the action of air damping, thereby achieving the purposes of preventing the fingers of the user from being injured and eliminating the potential safety hazard.

Description

technical field [0001] The present invention relates to a telescopic ladder, specifically refers to a safety telescopic ladder which is equipped with a slow-down air-resistance device, can be stretched when in use, and can be retracted and stored when not in use. . Background technique [0002] The telescopic ladder is a kind of ladder that can be opened and extended when in use, and can be folded and shortened for storage when not in use; the telescopic ladder is composed of several ladders that are nested together from bottom to top. The sub-ladders together can respectively pull up the effective climbing height of the extension telescopic ladder, and the sub-ladders at the bottom level of the telescopic ladder are called bottom-level sub-ladders. [0003] The telescopic ladders in the prior art are divided into two structures: manual unlocking and touch unlocking. Among them, the telescopic ladder of the manual unlocking structure is provided with a manual unlocking butt...

AI Technical Summary

Problems solved by technology

[0005] The aforementioned telescopic ladders in the prior art, regardless of the manual unlocking or touch unlocking structure, because of the fast falling and folding speed by virtue of their own weight, if the user's hands are not properly supported, it is easy to pinch or smash the safety of the user's fingers on the telescopic ladder rungs. Accident; Therefore, there is the problem and the deficiency of the potential safety hazard of smashing user's finger in prior art telescopic ladder structure

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