| Effect of elliptic handle shape on grasping strategies, grip force distribution, and twisting ability. | |
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MedLine Citation:
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PMID: 21973007 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A generic torque model for various handle shapes has been developed and evaluated using experimental data. Twelve subjects performed maximum isometric torques using circular and elliptic cylinders in medium and large sizes (circular: r = 25.4, 38.1 mm; elliptic: semi-major/minor axes = 30.9/19.3, 47.1/27.8 mm) finished with aluminium and rubber, in two opposite directions. Torque, grip force distribution, and finger position were recorded. Maximum torques were 25%, 7%, and 31% greater for the elliptic, large-size, and rubber-finished cylinders than for the circular, medium-size, and aluminium-finished cylinders, respectively. Greater torque for the elliptic cylinders was associated with 58% greater normal force that the subjects could generate for the elliptic than circular cylinders. The model suggests that greater torques for the large-size and rubber cylinders are related to long moment arms and greater frictional coupling at the hand-cylinder interface, respectively. Subjects positioned their hands differently depending on torque direction to maximise their normal force and torque generation. Statement of Relevance: Desirable handle features for torque generation may be different from those for grip only. Design of handles per advantageous handle features (e.g., shape, size, and surface) may help increase people's torque strength and contribute to increased physical capacity of people. |
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Authors:
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N J Seo; T J Armstrong |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Ergonomics Volume: 54 ISSN: 1366-5847 ISO Abbreviation: Ergonomics Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-06 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0373220 Medline TA: Ergonomics Country: England |
Other Details:
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Languages: eng Pagination: 961-70 Citation Subset: IM; S |
Affiliation:
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a Department of Industrial Engineering , University of Wisconsin-Milwaukee , 3200 N. Cramer St. , Milwaukee , WI , 53211 , USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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