Evaluation of Handles in a Maximum Screwdriving Torque Task

Details

• Personal Author:
  Kong, Yong-Ku ; Lee SJ ; Lowe, Brian D.
• Description:
  The effects of screwdriver handle shapes (longitudinal cross-sectional shapes: circular, hexagonal, triangular; lateral cross-sectional shapes: cylindrical, double frustum, reversed double frustum, cone), surfaces (rubber, plastic), and orientations of work piece (vertical, horizontal) on torque performance, finger force and subjective discomfort were tested in a maximum screw tightening exertion. The average of finger force contributions to the total torque force were 28.1%, 39.3%, 26.5%, 6.2% in order from index to little fingers; the average of phalangeal force contributions were 47.3%, 14.0%, 20.5% and 18.1% for distal, middle, proximal and metacarpal phalanges, respectively. The plastic surface handles exhibited higher discomfort and 15% lesser torque output than the rubber coated surface handles. Analysis of handle shapes indicated that screwdrivers designed with circular or hexagonal longitudinal cross-sectional shape result in less discomfort, as well as greater torque outputs, with less finger force. In the lateral cross-sectional shapes, reversed double frustum handles were associated with the greatest reported discomfort and less torque output than the double frustum and cone handles. In conclusion, screwdriver handles designed with combinations of circular and hexagonal lateral cross-sectional shapes with double frustum and cone longitudinal cross-sectional shapes appear to be optimal in this study. [Description provided by NIOSH]
• Subjects:
  Ergonomics Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Hand Tools Equipment Design Equipment Testing Extremities Force Hand Ergonomics Hand Tools Statistical Analysis Task Performance Tools
• ISBN:
  9780080450551
• Publisher:
  International Ergonomics Association
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-5
• NIOSHTIC Number:
  nn:20050354
• Citation:
  Proceedings of the 16th World Congress on Ergonomics (IEA2006), July 10-14, 2006, Maastricht, The Netherlands. Pikaar RN, Koningsveld EAP, Settels PJM, eds. Madison, WI: International Ergonomics Association, 2006 Jul; :1-5
• Editor(s):
  Pikaar RN; Koningsveld EAP; Settels PJM
• Federal Fiscal Year:
  2006
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the 16th World Congress on Ergonomics (IEA2006), July 10-14, 2006, Maastricht, The Netherlands
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:785cf5c327c1e6bbc2ca9c4e309ae2f21d4b8491bcd27f48d58c17741a21c08c78e3aa20c89b9415c24fe827aa43b7bfa0508ae24d794e795a033a68b88d9d3e
• Download URL:
  https://stacks.cdc.gov/view/cdc/210735/cdc_210735_DS1.pdf
• File Type:
  [PDF - 192.35 KB ]