손잡이가 휜 Plier의 작업 수행도, 손목 동작과 만족도 평가

Abstract

This study aims to investigate the effect of handle angles of pliers on performance, wrist motion and subjective rating of satisfaction. An experiment was conducted, in which handle angle of pliers was used as independent variable and 14 subjects participated. Based on the literature survey, plier handles angled at 0°, 10°, 20°, 30° and 40° were adopted in the experiment. The subjects were instructed to bend iron plates by 90° and to cut wires as soon as possible. The results revealed that 1) handle angles of pliers have significant effect on wrist motion and satisfaction(p<0.0001); 2) handle angles of pliers did not affect performance of completing tasks irrespective of types of tasks done in the study; 3) in the initial stage of windup, plier with handle angled at 20° produced the least wrist motion of deviation in task of bending iron plates, while plier with handle angled at 40° did in task of cutting wires; 4) degree of satisfaction was maximized when handle of pliers was bent by 20° in both tasks. On the basis of the results, it is recommended that handle of pliers be bent by 20~30°