Effects of torque ezposure, pace, and work:rest ratio on grip force in repetitive powered hand tool operations
Repetitive use of hand-held power tools, due to their potential to generate forces greater than an operator capacity, are associated with work-related upper extremity musculoskeletal disorders. This laboratory study investigated the effects of power tool-induced torque reaction and work:rest pattern on grip force exertion in repetitive nutrunner operations. Twenty men completed eight fastener-driving sessions that consisted of two different work:rest patterns of 360 repetitive tasks both at slow and fast pace using a pneumatic nutrunner, which was equipped with an instrumented tool handle. A custom-designed force gauge measured grip force in real time, on a torque reaction assembly joint and a control joint. The mean grip force exerted by participants during sessions with no torque buildup was 33％ of their maximum voluntary contraction whereas during sessions with torque buildup it was of 57％ maximum voluntary contraction. Additionally, throughout a session the grip force decreased more with the latter (-0.007 and -0.022 N/drive, respectively) suggesting considerable effort during torque buildup by the participants.
Jia-Hua Lin Raymond McGorry Rammohan Maikala. Christopher Brunette
Liberty Mutual Research Institute for Safety71 Frankland Road, Hopkinton, MA, USA Liberty Mutual Research Institute for Safety 71 Frankland Road, Hopkinton, MA, USA
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-4
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）