Transducer for indicating torque

Details Transducer for indicating torque Transducer for indicating torque

1975-10-06

1981-08-04

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

7386231, 173 12, B25B 23145

Patent

active

042815380

ABSTRACT:
A pneumatic power tool having a torque sensing control system is disclosed which is capable of consistently applying a precise torque to a fastener so that uniform tightening of any number of fasteners can be obtained. A torsional strain responsive transducer is mounted internally in the tool body and includes a strain gauge network mounted on a torsionally resilient portion of one of the gear cases of the drive train of the tool, the gear case being subject to a reaction component of the torque being transmitted through the drive train. The strain gauge network provides a control signal which effects energization of a solenoid-actuated air shut-off valve in the handle of the tool to automatically terminate the operation of the tool when a predetermined torque is obtained at the output spindle. The control system permits adjustment of the torque output of the tool and provides a visual readout of such output.

REFERENCES:
patent: 3385136 (1968-05-01), Berry et al.
patent: 3710874 (1973-01-01), Seccombe et al.
patent: 3800591 (1974-04-01), Tveter
patent: 3834467 (1974-09-01), Fuchs
patent: 3858444 (1975-01-01), Wallace

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