Electronic torque wrench

Details Electronic torque wrench Electronic torque wrench

1985-07-22

1987-06-02

Ruehl, Charles A.

Measuring and testing

Digital readout

81477, B25B 23142

Patent

active

046693190

ABSTRACT:
A torque wrench according to the invention has a rigid elongated body having a tool end adapted to be rotationally fixed to a part to which a predetermined desired torque is to be applied and an opposite handle end. Transducers including strain gauges connected between the tool end and the body generate an actual-value output corresponding to the actual torque being applied by the wrench to the part rotationally coupled to the tool end. A display connected to the transducers reads out torque and an input device generates a desired-value output corresponding to the desired torque to be applied by the wrench to the part rotationally coupled to the tool end. A first comparator connected to the transducer and input device compares the actual-value and desired-value signals and generates an alarm signal when the actual torque is substantially the same as the desired torque. In accordance with this invention a second comparator compared the actual torque with a relatively low threshold torque. A switch circuit connected between the display on one side and the transducer and second comparators on the other side feeds the desired-value signal to the display when the actual torque lies below the relatively low threshold torque and alternately feeds the actual-value signal to the display when the actual torque exceeds the threshold torque.

REFERENCES:
patent: 4558601 (1985-12-01), Stasiek et al.
patent: 4562746 (1986-01-01), Petit

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