Abstract
This paper is concerned with a compliant-hinge mechanism that can provide a wide range of torque-angle profiles. The mechanism consists of thin-walled open-section shells that are subjected to combined twisting and bending. A pair of open-section shells is so arranged as to get a large rotation about a virtual axis with high stiffness along other axes. A replaceable cam-like guideway regulates the bending of the open-section shells as they twist, thereby generating the desired torque profile. An energy-based, graphical, and computational design method is formulated to obtain the guideway profile for a specified torque profile. A physical prototype is constructed for an assistive chair for the elderly to demonstrate the variable-torque output and the efficacy of the hinge.
Issue Section:
Research Papers
References
1.
Radaelli
, G.
, and Herder
, J. L.
, 2017
, “Gravity Balanced Compliant Shell Mechanisms
,” Int. J. Solids Struct.
, 118–119
, pp. 78
–88
. 10.1016/j.ijsolstr.2017.04.0212.
Hou
, C. W.
, and Lan
, C. C.
, 2013
, “Functional Joint Mechanisms With Constant-Torque Outputs
,” Mech. Mach. Theory
, 62
, pp. 166
–181
. 10.1016/j.mechmachtheory.2012.12.0023.
Hampali
, S.
, Pai
, A. S.
, and Ananthasuresh
, G. K.
, 2018
, “An Open-Section Shell Designed for Customized Bending and Twisting to Ease Sitting and Rising in a Chair,” Machines, Mechanism and Robotics. Lecture Notes in Mechanical Engineering
, Springer
, Singapore
, pp. 427
–439
.4.
Kuo
, P. H.
, and Deshpande
, A. D.
, 2018
, “Novel Design of a Passive Variable Stiffness Joint Mechanism: Inspiration From Biomechanics of Hand Joint
,” Proceedings of the ASME 2013 Dynamic Systems and Control Conference
, Palo Alto, CA
, Oct. 21–23
.5.
Accto
, D.
, Tagliamonte
, N. L.
, Carpino
, G.
, Sergi
, F.
, Di Palo
, M.
, and Guglielmelli
, E.
, 2011
, “Design of a Rotary Passive Viscoelastic Joint for Wearable Robots
,” IEEE International Conference on Rehabilitation Robotics
, Zurich, Switzerland
, June 29–July 1
.6.
Wolf
, S.
, Eiberger
, O.
, and Hirzinger
, G.
, 2011
, “The DLR FSJ: Energy Based Design of a Variable Stiffness Joint
,” 2011 IEEE International Conference on Robotics and Automation
, Shanghai, China
, May 9–13
, pp. 5082
–5089
.7.
Accoto
, D.
, Tagliamonte
, N. L.
, Carpino
, G.
, Sergi
, F.
, Di Palo
, M.
, and Guglielmelli
, E.
, 2012
, “PVEJ: A Modular Passive Viscoelastic Joint for Assistive Wearable Robots
,” Proceedings—IEEE International Conference on Robotics and Automation
, St. Paul, MN
, May 14–18
, pp. 3361
–3366
.8.
Eugene
, W. N.
, Ambler
, D. A.
, and Lowry
, W.
, 1991
, “Bistable Hinge Mechanism
,” U.S. Patent No. 6,141,831. 10.1016/j.(73)
.9.
Waynick
, W. A.
, 1991
, “Detent Mechanism For A Vehicle Door
,” U.S. Patent No. 6,108,866. 10.1016/j.(73)
.10.
Sanders
, M. D.
, 1988
, “Elastomeric Hinge Spring
,” U.S. Patent No. 4.794,6769. 10.1057/9780230607156
.11.
Nair Prakashah
, H.
, and Zhou
, H.
, 2016
, “Synthesis of Constant Torque Compliant Mechanisms
,” ASME J. Mech. Rob.
, 8
(6
), p. 064503
. 10.1115/1.403488512.
Guest
, S.
, Kebadze
, E.
, and Pellegrino
, S.
, 2011
, “A Zero-Stiffness Elastic Shell Structure
,” J. Mech. Mater. Struct.
, 6
(1–4
), pp. 203
–212
. 10.2140/jomms.2011.6.20313.
Jutte
, C. V.
, 2008
, “Generalised Synthesis Methodology of Nonlinear Springs for Prescribed Load-Displacement Functions
,” PhD thesis
, University of Michigan
, Ann Arbor, MI
.14.
Groothuis
, S.
, Carloni
, R.
, and Stramigioli
, S.
, 2014
, “A Novel Variable Stiffness Mechanism Capable of an Infinite Stiffness Range and Unlimited Decoupled Output Motion
,” Actuators
, 3
(2
), pp. 107
–123
. 10.3390/act302010715.
Robinson
, J. M.
, 2015
, “A Compliant Mechanism-Based Variable-Stiffness Joint
,” Master’s thesis
, Bringham Young University
, Provo, UT
.16.
Xie
, Z.
, Qiu
, L.
, and Yang
, D.
, 2018
, “Design and Analysis of a Variable Stiffness Inside-Deployed Lamina Emergent Joint
,” Mech. Mach. Theory
, 120
, pp. 166
–177
. 10.1016/j.mechmachtheory.2017.09.02317.
Cannon
, J. R.
, and Howell
, L. L.
, 2005
, “A Compliant Contact-Aided Revolute Joint
,” Mech. Mach. Theory
, 40
(11
), pp. 1273
–1293
. 10.1016/j.mechmachtheory.2005.01.01118.
Goldfarb
, M.
, and Speich
, J. E.
, 1999
, “A Well-Behaved Revolute Flexure Joint for Compliant Mechanism Design
,” ASME J. Mech.. Des.
, 121
(3
), pp. 424
–429
. 10.1115/1.282947819.
Bona
, F. D.
, and Zelenika
, S.
, 1997
, “A Generalized Elastical-Type Approach to the Analysis of Large Displacements of Spring-Strips
,” Proc. Inst. Mech. Eng., Part C
, 211
(7
), pp. 509
–517
. 10.1243/095440697152189020.
Smith
, S. T.
, 2000
, Flexures : Elements of Elastic Mechanisms
, CRC Press
, Boca Raton, FL
.21.
Trease
, B. P.
, Moon
, Y. M.
, and Kota
, S.
, 2005
, “Design of Large-Displacement Compliant Joints
,” ASME J. Mech. Des.
, 127
(4
), p. 788
. 10.1115/1.190014922.
Tummala
, Y.
, Frecker
, M. I.
, Wissa
, A. A.
, and Hubbard
, J. E.
, 2014
, “Design Optimization of a Twist Compliant Mechanism with Nonlinear Stiffness
,” Smart Mater. Struct.
, 23
(10
), p. 104010
.
10.1088/0964-1726/23/10/10401023.
Hull
, C. W.
, 1986
, “Seating Furniture With Lift Mechanism
,” U.S. Patent No. 7.455,360 B2
. DOI: 10.1145/634067.634234.24.
Poncy
, R. P.
, 1987
, “Chair With Lift Assistance Mechanism
,” U.S. Patent No. 4,690,457
.25.
Newman
, D.
, 1994
, “Seat Assist
,” U.S Patent No. 5,316,370
.26.
Gore
, I. G. E.
, Branch
, N.
, Roman
, T.
, Orange
, E.
, Wayne
, K.
, and Gore
, R. A.
, 1998
, “Seat Assist
,” U.S. Patent No. 5,31,370. DOI:US005485919A
.27.
Wright
, J. D.
, 1972
, “Seat Construction
,” U.S. Patent No. 3,659,897
.28.
Doerner
, J. T.
, 1969
, “Chair Control With Torsion Spring Tilting Seat and Chair Back
,” U.S Patent No. 83,603,640
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