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CISDOC database

Document ID (ISN)30731
CIS number 79-270
ISBN(s) 91-7464-023-2
Year 1978
Convention or series no.
Author(s) Carlsöö S., Hansson J.E., Uppsäll M.
Title Optimum working range in the operation of levers
Original title Optimala arbetsområden vid manövrering av handreglage [in Swedish]
Bibliographic information Arbete och hälsa - Vetenskaplig skriftserie 1978:12, Arbetarskyddsverket, Stockholm, Sweden, 1978. 38p. 15 ref.
Abstract In this study, 20 seated subjects themselves determined the best location for 2 types of lever at 3 different work heights. The load on the shoulder muscles was measured electromyographically in 6 subjects. The optimum range was quite small, and usually had the shape of an ellipse. Lever locations providing an elbow angle of about 105° when the arm was parallel to the trunk were the most comfortable. Use of an arm support increased the load on the shoulder in forward-backward movements, and reduced it in lateral movements. Optimum locations for levers are recommended: levers used more than 2-3h/day should be adjustable.
Descriptors (primary) control levers; reach distance; design of equipment; optimization; layout of controls
Descriptors (secondary) sitting posture; forearm supports; ergonomic evaluation; electromyography; measurement of load on muscles
Document type E - Books, reports, proceedings
Subject(s) Ergonomics and work organization
Broad subject area(s)
Browse category(ies) Anthropometry
Ergonomics