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Stretchable ladder

A telescopic ladder and ladder frame technology, which is applied to ladders, buildings, building structures, etc., can solve problems such as telescopic ladders cannot be automatically locked, and achieve the effects of safe and reliable device structure, improved efficiency, and time saving

Inactive Publication Date: 2016-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to improve the problem that the existing telescopic ladder cannot be automatically locked and realize rapid expansion and contraction

Method used

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 with image 3 As shown, the present invention nests a plurality of ladder units with the same structure and gradually changing sizes in the telescopic ladder along the length direction. The ladder frame of each ladder unit is mainly composed of two ladder legs and the cross brace between the two ladder legs. In any two adjacent ladder units, a locking device is provided between the legs on both sides of the connection between the lower ladder frame 1 and the upper ladder frame 2, and the ladder legs of the upper ladder frame 2 are socketed In the ladder legs of the lower ladder frame 1, they are detachably connected by a locking device with the same structure.

[0025] Such as figure 2 with Figure 4 As shown, the locking device is installed near the bottom of the cross brace. The locking device includes a locking pin 3, a l...

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Abstract

The invention discloses a stretchable ladder. A plurality of same-structure ladder units with gradually-changed sizes are sequentially nested in the length direction of the stretchable ladder. In every two adjacent ladder units, ladder legs of an upper ladder frame are sleeved with ladder legs of a lower ladder frame, and then the ladder legs of the upper ladder frame and the ladder legs of the lower ladder frame are detachably connected through locking devices of the same structures; the locking devices comprise locking pins, locking springs, locking pin sleeves, switch buttons, switch springs and switch boxes; the two ends of the locking springs are connected with the two locking pins respectively, the locking pins horizontally and sequentially penetrate through pin holes in the side walls of the upper ladder frames and the side walls of the lower ladder frames and extend out, the switch springs are installed in the switch boxes, and one ends of the switch springs are connected to the outer side walls of the lower ladder frames and arranged on extending parts of the locking pins in a sleeving mode. By means of the stretchable ladder, automatic locking and automatic unlocking can be achieved, and the structure is stable and reliable.

Description

technical field [0001] The invention relates to a telescopic ladder, and in particular provides a telescopic ladder with automatic locking and unlocking and safe and reliable structure. Background technique [0002] At present, most telescopic ladders at home and abroad are composed of ladder elements with the same structure and decreasing size, and the locking device between adjacent ladder elements is composed of springs and fixed pins. When stretching and contracting the ladder, the staff needs to manually operate each level of locking device, which greatly increases the use time and reduces work efficiency. Contents of the invention [0003] The purpose of the present invention is to improve the problem that the existing telescopic ladder cannot be automatically locked and realize rapid expansion and contraction. The invention particularly provides a telescopic ladder, which can be automatically locked, has a safe and reliable structure, can realize rapid expansion an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E06C1/12E06C7/06
CPCE06C1/12E06C7/06
Inventor 邱清盈娄元静冯培恩杨超
Owner ZHEJIANG UNIV
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