Handle Positions and Angles in a Dynamic Lifting Task.
Proceedings of the Human Factors Society, 28th Annual Meeting, 1984, :600-604
The effects of different handle positions and angles on a manual lifting task were evaluated with regard to materials handling injury reduction. Thirty industrial workers participated in the study (15 males, 15 females, average age 24 years). The lifting task was performed using plywood containers weighing 11 kilograms, with handhold cutouts at four different positions and angled at either 70 or 35 degrees to the horizontal. Three different lift heights were used from floor to waist, waist to shoulder and floor to shoulder. Each subject did eight lifts for each combination of lift height, handle position and handle angle while side view movie films were taken. Angles of body segments were digitized at five heights between floor, waist, and shoulder; box angle, wrist deviation angle, slippage angle and elbow angle were measured. While the four tested handle positions and two handle angles did not differ in their effects on heart rate and perceived exertion, handle positions with horizontal and vertical stability gave better biomechanical results. A set of handle positions with handles placed in the middle of the front edge of the box at 60 degrees and in the middle of the lower edge at 50 degrees to the horizontal was recommended to minimize wrist deviation and slippage.
NIOSH-Publication; Biomechanics; Materials-handling; Work-analysis; Industrial-factory-workers; Equipment-design; Ergonomics; Physical-reactions; Accident-prevention;
Proceedings of the Human Factors Society, 28th Annual Meeting, 1984