Analysis of the Handle Cross-section Design of Cordless Drill Screwdriver
Authors: Hao Jhe Li, Johan Chang
Abstract: The "cordless drill screwdriver" is a widely utilized and versatile tool in the field of power tools. However, power tools generate a certain amount of torque force transmitted to the hands during operation. While the human wrist joint can absorb a certain degree of torque force, the torque generated by power tools during handheld operation is significant, leading to deviations in wrist posture and forearm rotation, which also impose muscular load. Previous studies have proposed diameter recommendations for cylindrical handle designs to enhance performance and reduce the risk of muscle load. It has been suggested in past research that the diameter of a circular handle affects grip strength, and recent studies have used hand handles scanned with magnetic resonance imaging to increase the contact area between the hand and the handle, improving grip contact force and comfort. It is evident that the size and form of the handle significantly impact the operator's grip strength, efficiency, and subjective perception. Building upon this, this study aims to explore the drill-driver configurations that reduce reverse torque. We will collect and compile various handle cross-sectional designs of cordless drill screwdrivers available on the market, using an affinity diagram to categorize the existing handle cross-sectional designs. The results reveal a total of six major handle cross-sectional designs in the market. Furthermore, the grip postures corresponding to these six-handle cross-sectional designs will be discussed, and future experiments can be conducted to investigate the impact of these six-handle cross-sectional designs on grip strength.
Keywords: Grip, Grip strength, Cordless Drill Screwdriver
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