Electronic torque wrench

Details Electronic torque wrench Electronic torque wrench

1988-05-27

1989-09-12

Ruehl, Charles A.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

7386226, G01L 2500, B25B 23142

Patent

active

048648418

ABSTRACT:
An electronic torque wrench equipped with at least two strain gages placed on both sides of a crosswise plane on a part forming a sensor and each supplying an output voltage, C.sub.1 and C.sub.2 respectively, which, depending on torque C applied by the wrench to an actuation point A, reacts on an electronic circuit indicating this torque. The wrench comprises a first electronic circuit for determining and storing a constant factor k during a calibration measurement for which torque C is applied at actuation point A is made zero by a parasitic force F' applied in the opposite direction of actuation force F and at a point E of the wrench other than point B of application of the latter force F, the constant factor k being used during each use of the wrench by the electronic circuit to determine, with second circuit and by application of the formula C=C.sub.1 +k(C.sub.1 -C.sub.2), the value of torque C applied to actuation point A as a function of torques C.sub.1 and C.sub.2 actually measured respectively by the at least two strain gages.

REFERENCES:
patent: 3970155 (1976-07-01), Otto
patent: 3995477 (1976-12-01), Almond
patent: 4006629 (1977-02-01), Barrett et al.
The Strain Gage Primer-McGraw-Hill Book Co., 2nd Ed., Perry & Lissiner, pp. 230-232.

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