Abstract
A common setup for industrial machines is to install a pair of actuator buttons a safe distance from the point of operation. Safety codes specify that minimum distance by assuming a constant hand speed of 1.6 m/s. To examine the adequacy of that value, a simulated power press with a moving ram was set up for measuring actual hand speed for three placements of the buttons. For each placement, a randomized complete block experiment with nine students provided after-reach hand speed data. Results indicated that after-reach hand speed is not a constant because it varies both with placement of the buttons and distance within placement.
The first author conducted the experiment as part of his Ph.D. Dissertation entitled Safe Hand-button Distance for Mechanical Power Presses, West Virginia University, 1989. The second author chaired the dissertation committee. Neither the experiment nor results have been reported in the open literature prior to this paper.
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Acknowledgments
This experiment was conducted in facilities of the National Institute for Occupational Safety and Health (NIOSH), Morgantown, WV. The time spent writing this report was partially supported by Training Project Grant Number T03/CCT810449 from the U.S. Centers for Disease Prevention and Control, National Institute for Occupational Safety and Health. The contents are solely the responsibility of the authors and not represent the official views of the National Institute for Occupational Safety and Health.
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Jensen, R., Stobbe, T. (2016). Safe Distance for Machinery Actuators: Is After-Reach Speed a Constant?. In: Arezes, P. (eds) Advances in Safety Management and Human Factors. Advances in Intelligent Systems and Computing, vol 491. Springer, Cham. https://doi.org/10.1007/978-3-319-41929-9_30
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DOI: https://doi.org/10.1007/978-3-319-41929-9_30
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