つまみに関する人間工学的研究 : つまみの大きさおよび形状がつまみひねり力におよぼす影響について

概要

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The purpose of this study was to determine the effects of torsional strength to knob size and shapes. The torsional strength was determined, by torsional strength transducer provided with straingauge method. The used of knob size and shapes were as follows ; as to knob diameter, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, and as to knob shapes, triangle type, square type, pentagon type, heptagon type, circle type, and total kinds were forty. The torque exerted for an instant was torqued for abduction with right hand. Simultaneously, the angle of finger joints were measured by photographic method and electro-myograms were recorded by surface electolode on M. ext. carpi rad. and M. ext. dig. comm. The following results were obtained; 1) From 10 mm to 50 mm in knob diameter, there was a steady increase of torsional strength with increase in knob diameter. And from 50mm to 80mm, there was no difference on torsional strength. 2) From the standpoint of human factors and the amplitude of EMG (μV), optimum knob diameter was 50 mm. And the torsional strength in 50 mm knob was 8.0 kg. 3) The torsional strength of the more polygonal knob shapes were superior to that of the less polygonal knob shapes. 4) These tendencies have relation to the angle of finger joints and sliding friction between finger and knob.
大同工業大学の論文