Among Bricard's overconstrained 6R linkages, the third type has two collapsed configurations, where all joint axes are coplanar. This paper presents a one-degree-of-freedom network of such linkages. Using the two coplanar states of the constituent Bricard units, the network is able to cover a large surface with a specific outline when deployed and can be folded compactly into a stack of much smaller planar shapes. Five geometric parameters describing each type III Bricard mechanism are introduced. Their influence on the outline of one collapsed configuration is discussed and inverse calculation to obtain the parameter values yielding a desired planar shape is performed. The network is built by linking the units, either using scissor linkage elements, if the thickness of the panels can be ignored, or with hinged parallelograms, for a thicker material. Two case studies, in which the Bricard network deploys as a rectangle and a regular hexagon, respectively, are presented, validating the analysis and design methods.
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February 2019
Research-Article
A Network of Type III Bricard Linkages
Simon D. Guest
Simon D. Guest
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Shengnan Lu
Dimiter Zlatanov
Xilun Ding
Matteo Zoppi
Simon D. Guest
Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANISMS AND ROBOTICS. Manuscript received April 21, 2018; final manuscript received September 26, 2018; published online December 10, 2018. Assoc. Editor: Raffaele Di Gregorio.
J. Mechanisms Robotics. Feb 2019, 11(1): 011013 (9 pages)
Published Online: December 10, 2018
Article history
Received:
April 21, 2018
Revised:
September 26, 2018
Citation
Lu, S., Zlatanov, D., Ding, X., Zoppi, M., and Guest, S. D. (December 10, 2018). "A Network of Type III Bricard Linkages." ASME. J. Mechanisms Robotics. February 2019; 11(1): 011013. https://doi.org/10.1115/1.4041641
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