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Investigation of the after-reach hazard in two-hand controlled power press operations.

Authors
Pizatella-TJ; Etherton-JR; Jensen-RC; Oppold-JA
Source
Scand J Work, Environ & Health 1983 Apr; 9(2):194-200
NIOSHTIC No.
00185063
Abstract
The hand injury hazard to power press operators when reaching into the press die area after the downward motion of the press ram started (called after reach) was studied. One safeguard designed to prevent the after reach hazard was to incorporate a two hand actuator control that required pressure from both hands to maintain the motion of the press ram. In this study, a model power press was used to simulate the operation of a power press. The subjects performed simulated work cycles, including a random after reach condition in which subjects were to reach from the actuator controls into the press die area to reposition a work blank. The work blank was dislodged at random intervals by an air valve controlled by an observer who could not be seen by the subject. The after reach time was then measured, and average hand speed calculated. The experiments were performed with the actuator controls in two different positions, an upper and a lower location. The overall mean hand speed was 13.2 meters/second for the upper control position and 0.94 meters/second for the lower position. The authors conclude that the location of the actuator controls has a significant effect on average hand reach speed. More research is needed to define and characterize the additional factors involved in after reach conditions.
Keywords
NIOSH-Author; Industrial-hazards; Machine-operation; Hand-injuries; Machine-operators; Simulation-methods; Safety-engineering; Author Keywords: actuator location; after-reach time; hand-reach speed; point of operation; simulated press; two-hand actuator
CODEN
SWEHDO
Publication Date
19830401
Document Type
Journal Article
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
0355-3140
NIOSH Division
DSR
Source Name
Scandinavian Journal of Work, Environment and Health
State
WV
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