Muscle responses to simulated torque reactions of hand-held power tools

Article Abstract:

Small hand-held power screwdrivers are used repetitively by workers in many industries to secure threaded fasteners. A study was conducted to select the tools to be used for a particular application that would minimize operators' muscle-tendon loads. The study also aimed to examine muscle responses to torque loads akin to those produced by small powered hand tools and to study the effect of torque build-up and decay times on muscle responses preceding, during and following the application of torque and on workers' ability to maintain a constant tool position. results are discussed.

Usage, Occupational health and safety, Occupational safety and health, Tool use in animals, Animal tool use, Rotational motion (Rigid dynamics)

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The influence of target torque and torque build-up time on physical stress in right angle nutrunner operation

Article Abstract:

A research to determine the effects of various power hand tools and process parameters on muscular activity, perceived exertion and handle stability was conducted. Three male and three female participants were subjected to each experimental condition, of which 10 replications were made. The findings show that 150 and 300 ms build-up times result to greater displacement of the handle and power against the operator. It was also found that handle instability occurs most with a build-up time of 150 ms.

Stress (Psychology)

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An indirect method for measuring the torque applied to friction-loaded cycle ergometers

Article Abstract:

A series of tests were conducted on a group of twenty subjects pedalling on a cycle ergometer to compare the results obtained against those generated by computer analysis. Results showed that torque profiles obtained from both methods were very similar, and that net torque applied to pedals can be computed by measuring flywheel acceleration.

Measurement

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