DefinePK

Abstract

Studies concluded that clockwise torque directions secure and improve grip force compared to counter-clockwise torque directions. However, it appears that there is no study on the design and development of an ergonomic screwdriver to address the difficulty of manually unfastening screws. In this study, a screwdriver concept was developed with clockwise directional input and ergonomic features. Previous studies found that the ergonomic design recommendations involved in designing the handles of hand tools were diameter, shape and material. The planetary gear system was proposed in the design concept as a solution to change the screwdriver input direction inwards for unfastening tasks. Ergonomics design factors such as handle diameter, shape and surface material were also taken into consideration for a more secure grip. With lower force requirements and ergonomic features, this screwdriver can potentially benefit manual workers towards decreasing risks of sustaining CTDs and accidents, and eventually improve efficiency in precision tasks.