Design Options Considerations for Retrofit ROPS.
Etherton-JR; Hause-MG; Hsiao-H; Bobick-TG
1991 International Winter Meeting of the American Society of Agricultural Engineers, Chicago, Illinois, December 17-20 1991 Dec:10 pages
An assessment is reported of biomechanical performance factors that may be important if retrofit rollover protective structures (ROPS) are developed which can be moved out of the way of the farmer when there is no rollover hazard. Current adjustable ROPS were observed at tractor dealer sales locations on new tractors. Two types of lift were considered, one for each type of adjustable ROPS. Videotaped lifting postures and force gauge load measurements were taken during field observations of two people using one folding type ROPS and one telescoping type ROPS. Shoulder strength testing suggested that if engineering controls were used to reduce the load on the shoulder, structures weighing 311 newtons should be within biomechanically predicted static lifting capabilities of more 95 percentile females. The authors note that conclusions that may be drawn from this biomechanical evaluation are restricted by previously described assumptions inherent to the 2D Static Strength Model. A dynamic method of analysis would be more realistic, but the models for evaluating dynamic movement were not widely available, or fully tested. The authors caution that this kind of approach to making biomechanical predictions for risk of injury to the various body links may underestimate the real risk.
Safety-equipment; Equipment-design; Manual-lifting; Agricultural-machinery; Farmers; Muscle-function; Human-factors-engineering; Agricultural-workers;
1991 International Winter Meeting of the American Society of Agricultural Engineers, Chicago, Illinois, December 17-20, 1991, 10 pages, 12 references