Electronic torque wrench

Details Electronic torque wrench Electronic torque wrench

1975-07-11

1976-07-20

Ruehl, Charles A.

Measuring and testing

Brake testing

Single wheel rotating and resistance measuring means

B25B 2314

Patent

active

039701557

ABSTRACT:
An electronic torque wrench including a strain measuring bridge circuit disposed to measure the bending strain of the handle thereof, a NAND gate circuit connected to alternately excite the bridge according to the switching state thereof, a differential circuit connected to receive the bridge balance signal, an integrator connected to integrate a selected polarity output signal from said differential circuit, a clock-driven counter connected to be inhibited for a predetermined time interval following each time the integrating circuit output signal changes polarity providing selected binary level output signals to switch the NAND gate circuit according to the state thereof and a logical switching circuit connected to the selected binary level output signals of said counter for alternatively connecting either the output signal from the differential circuit or a fixed reference signal to the integrator.

REFERENCES:
patent: 3649826 (1972-03-01), Larsson et al.
patent: 3662845 (1972-05-01), Pratt
patent: 3713136 (1973-01-01), Nagy, Jr.
patent: 3812923 (1974-05-01), Rock
patent: 3828255 (1974-08-01), Schuon

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