Measuring and testing – Muscular force
Patent
1982-01-05
1985-02-26
Ruehl, Charles A.
Measuring and testing
Muscular force
7386253, 7386267, G01L 502, G01L 118
Patent
active
045011486
ABSTRACT:
A portable manual muscle tester has an external actuator, a case capable of being held in one hand and a digital display indicating peak force applied to the actuator. Strain gages connected in a bridge circuit are located on a flexure contacted by the actuator. The flexure is a cantilever beam shaped to fit the small case and to prevent reflected or mounting stresses being registered in the force display. The circuit from the strain gage bridge to the display includes an instrumentation amplifier followed by a peak freeze circuit that includes operational amplifiers and a peak freeze capacitor. The peak freeze capacitor provides a voltage that is read by a digital volt meter. A further operational amplifier connected as an integrator feeds back from the peak freeze circuit to an input of the instrumentation amplifier to reset the meter to zero after the displayed force reading has been noted.
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Literature of Ametak for "Accuforce" digital force gauge, undated.
Literature of Abbey Medical for "Duratech Force Monitor", undated.
Krukowski Richard
Nicholas James A.
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