An Open-Section Shell Designed for Customized Bending and Twisting to Ease Sitting and Rising in a Chair

Hampali, Shamanth and Anoosha, Pai S and Ananthasuresh, GK (2019) An Open-Section Shell Designed for Customized Bending and Twisting to Ease Sitting and Rising in a Chair. [Book Chapter]

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Abstract

This paper is concerned with a compliant-hinge mechanism in an assistive chair that does not use external power in aiding the elderly and arthritics in stand-to-sit and sit-to-stand manoeuvres. The mechanism, attached to the seat of the chair, acts like a nonlinear torsion spring that is effectively pivoted to the frame. A pair of semi-circular open-section shells that are rigidly connected to each other and fastened to the chair frame comprise the spring. A cam profile on a guide plate enables the shells to deform transversely even as they twist to provide customized torque-angle characteristic as per the weight of the occupant. The formulation of the design specification based on biomechanical considerations, kinetics of sitting and rising in a chair, kinetoelastic modelling of open-section shells, a new energy mapping method of designing the guideway for the shells, and simulation of the entire unitized compliant spring mechanism are presented.

Item Type:	Book Chapter
Publication:	Notes in Mechanical Engineering
Series.:	Machines, Mechanism and Robotics. Lecture Notes in Mechanical Engineering
Publisher:	SPRINGER-VERLAG BERLIN
Additional Information:	Copyright for this article belongs to SPRINGER-VERLAG BERLIN
Keywords:	Adjustable stiffness; Assistive chair; Compliant-hinge mechanism; Elastic centre; Geriatrics
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	30 May 2019 10:54
Last Modified:	31 May 2019 05:33
URI:	http://eprints.iisc.ac.in/id/eprint/62446

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