Technical Briefs

Mechanism Synthesis of a Foldable Stair

[+] Author and Article Information
Jing-Shan Zhao1

Department of Precision Instruments and Mechanology,  Tsinghua University, Beijing 100084, P. R. Chinajingshanzhao@mail.tsinghua.edu.cn

Jian-Yi Wang, Fulei Chu, Zhi-Jing Feng

Department of Precision Instruments and Mechanology,  Tsinghua University, Beijing 100084, P. R. China

Jian S. Dai

Centre for Advanced Mechanisms and Robotics, Tianjin University, Tianjin 300072, P. R. China; King’s College London,  University of London, London WC2R 2LS, UK


Corresponding author.

J. Mechanisms Robotics 4(1), 014502 (Feb 03, 2012) (6 pages) doi:10.1115/1.4005332 History: Received May 03, 2010; Revised August 08, 2011; Published February 03, 2012; Online February 03, 2012

This paper proposes a foldable stair that is easily deployed for use and folded for storage. It consists of a number of identical deployable scissor-like elements which form the staircases when expanded. In addition to use, the folded stair can be used for hanging clothes and acting as a decoration. The mechanism of the stair is first synthesized in line with the common stairs between two horizontal levels. The actuating mechanism is then synthesized in accordance with two extreme positions of the stair, folded, and unfolded. Because the stair can be folded after use, it is convenient in use and will witness a wide application both indoors and outdoors where there is no enough space for a fixed stair. In addition, this deployable stair is also particularly useful in evacuating people from a building when the disasters such as earthquakes occur.

Copyright © 2012 by American Society of Mechanical Engineers
Topics: Stairs , Mechanisms
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Figure 1

A scissor-like element

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Figure 2

A planar four-bar linkage

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Figure 3

The deployment geometry of a six-bar mechanism

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Figure 4

A foldable stair mechanism

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Figure 5

Synthesis of an actuating mechanism

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Figure 6

The unfolded stair mechanism

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Figure 8

The folded and deployed stair model




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