PMID: 15359673Sep 14, 2004Paper

Productivity and ergonomic investigation of bent-handle pliers

Human Factors
Kelly DukeCarolyn M Sommerich

Abstract

Awkward wrist posture is generally considered an occupational risk factor for hand/wrist disorders, leading to the ergonomic design principle of "bend the tool, not the wrist." Sixteen participants performed a computer jumper installation task and a simple assembly task while productivity, wrist posture, and shoulder posture were measured. The work surface orientation (vertical and 45 degrees) and the level of constraint placed on the user (constrained grip and unconstrained grip) were also varied. The results indicate that the beneficial effects of the bent-handle pliers are task dependent. In the computer jumper task the bent-handle pliers resulted in 5.3% faster task performance, whereas in the assembly task performance was 4.9% faster with the straight-handle pliers. The bent-handle pliers reduced shoulder deviations by 50% in the jumper installation task, and ulnar deviation was reduced by 12% and 22% for the jumper installation task and the assembly task, respectively (all significant at p < .05). However, allowing participants to hold the pliers in a grip configuration of their choosing (unconstrained technique) often reduced these postural benefits. In applying these results to workplace design activities, one should re...Continue Reading

References

Feb 1, 1982·American Industrial Hygiene Association Journal·T J ArmstrongS A Goldstein
Apr 1, 1993·Ergonomics·W S Marras, R W Schoenmarklin
Jul 10, 1999·Journal of Biomechanics·J J FarawayD B Chaffin
Jan 18, 2003·AIHA Journal : a Journal for the Science of Occupational and Environmental Health and Safety·Patrick G DempseyNiall O'Brien

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Citations

Dec 19, 2006·Journal of Occupational and Environmental Hygiene·Dan AntonJonathan Reynolds
Apr 2, 2008·Applied Ergonomics·Gary A MirkaJeff Hoyle
Aug 23, 2017·Work : a Journal of Prevention, Assessment, and Rehabilitation·Iman DianatMoein Nedaei
Mar 7, 2020·International Journal of Environmental Research and Public Health·Malene Jagd SvendsenAndreas Holtermann

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