A novel theory: ellipse of grip force.
Dong-RG; Welcome-DE; Warren-C; Dong-CL; McDowell-TW; Wu-JZ
Proceedings of the First American Conference on Human Vibration, June 5-7, 2006, Morgantown, West Virginia. Dong R, Krajnak K, Wirth O, Wu J, eds., Morgantown, WV: National Institute for Occupational Safety and Health, 2006 Jun; :142-143
Hand forces are important factors for risk assessment of hand-arm vibration syndrome (HAVS). Grip force is one of the most important force components in the operation of powered hand tools. A considerable number of studies on grip force have been reported. It is well known that the grip force applied on a cylindrical handle is not uniformly distributed on each axis across the center of the handle cross-section? Therefore, maximum and minimum orientations of grip force exist around the handle. Such orientations have not been clearly identified. In a recently proposed international standard (ISO/CD 15230, 2005), it is stated that "the direction of the main gripping force is generally parallel to the z-axis defined in ISO 8727." This assertion is questionable, and further examinations are required. The objective of this study was to establish a fundamental theory on the distribution of the grip force around cylindrical handles.
Biodynamics; Biomechanics; Biomechanical-modeling; Vibration-exposure; Vibration; Power-tools; Ergonomics
Dong-R; Krajnak-K; Wirth-O; Wu-J
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Proceedings of the First American Conference on Human Vibration, June 5-7, 2006