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Design Innovation Paper

A Lamina-Emergent Frustum Using a Bistable Collapsible Compliant Mechanism (BCCM)

[+] Author and Article Information
Rami Alfattani

Department of Mechanical Engineering, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620
rami1@mail.usf.edu

Craig Lusk

Department of Mechanical Engineering, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620
clusk2@usf.edu

1Corresponding author.

ASME doi:10.1115/1.4037621 History: Received October 17, 2016; Revised August 04, 2017

Abstract

This paper presents a new Bistable Collapsible Compliant Mechanism (BCCM) that is utilized in a Lamina- Emergent Frustum. The mechanism is based on transforming a polygon spiral into spatial frustum shape using a mechanism composed of compliant links and joints that exhibits bistable behavior. A number of mechanism types (graphs) were considered to implement the shape-morphing spiral, including 4-bar, 6-bar, and 8-bar chains. Our design requirements permitted the selection of a particular 8-bar chain as the basis for the BCCM. Bistable behavior was added to the mechanism by introducing snap-through bistability as the mechanism morphs. Parametric CAD was used to perform the dimensional synthesis. The design was successfully prototyped. We anticipate that the mechanism may be useful in commercial small animal enclosures or as a frame for a solar still.

Copyright (c) 2017 by ASME
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