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Simulation of the After-Reach Hazard on Dual Palm Button Workstations.

Pizatella-TJ; Moll-MB
Proceedings of the Human Factors Society, 29th Annual Meeting, 1985, :824-828
The after reach hazard to industrial operators was studied using power press simulators and operator hand reaching capabilities were measured. A power press simulator was designed to imitate an industrial power press without exposing operators to risks. The experimental task simulated a routine stamping operation. The simulator included two dual palm button actuators, one at waist level and the other at shoulder level. The after reach hazard was simulated by using a rounded plunger in the center of the lower die to displace the workpiece from its proper position; the subject released the actuators and reached into the point of operation to try to reposition the piece before the press ram completed its descent. Timing of the various hand actions were measured using a photooptical sensing plane. Sixty industrial workers took part in the study, 31 males (mean age 36.7 years) and 29 females (mean age 41.7 years). Four random after reach events were created by the session monitor for analysis and comparison with normal reaching movements. There were at least three variables which affected estimates of operator hand speed including worker age, gender and palm button location; workers reached faster from shoulder level palm button locations than from waist level, and young male workers, having the fastest hand speed, were at the greatest risk of sustaining after reach associated injury.
Equipment-design; Work-operations; Simulation-methods; Accident-potential; Industrial-factory-workers; Occupational-hazards; Industrial-safety; Safety-research;
Document Type
Conference/Symposia Proceedings;
NTIS Accession No.
NTIS Price
Source Name
Proceedings of the Human Factors Society, 29th Annual Meeting, 1985