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Frontiers of Mechanical Engineering >> 2016, Volume 11, Issue 2 doi: 10.1007/s11465-016-0398-6

Eversible duoprism mechanism

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

Accepted: 2016-06-20 Available online: 2016-06-29

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Abstract

In this study, a novel duoprism mechanism that demonstrates a fascinating eversion motion is developed. The mechanism comprises three scalable platforms and nine retractable limbs and is constructed by inserting prismatic and revolute joints into the edges and vertices of the duoprism, respectively. According to mobility and kinematic analyses, the mechanism has five degrees of freedom. Six inputs, including a redundant one, are required to overcome singularity and achieve an eversion motion. In the eversion motion, three platforms expand/contract synchronously, and the mechanism continuously turns inside out. The detailed gaits of eversion motion along an ellipse and a circle after a cycle are illustrated with two examples. A kinematic simulation is conducted, and a manual prototype is fabricated to verify the feasibility of the eversible duoprism mechanism.

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