Retorque measuring apparatus

Details Retorque measuring apparatus Retorque measuring apparatus

1980-12-17

1982-03-16

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73761, B25B 23142, G01L 524

Patent

active

043194940

ABSTRACT:
Apparatus for measuring the amount of previously applied torque to a fastener. A transducer is utilized to sense the amount of a subsequently applied torque to the fastener and provides an output signal representative of the applied torque. The torque is applied until further motion or breakaway of the fastener is obtained. Typically, the signal from the transducer increases until breakaway of the fastener is obtained and then the signal decreases momentarily to a valley before it again increases with further applied torque. In those instances where the particular fastener does not exhibit a well-defined valley torque signal, provision is made for detecting the value of the transducer torque signal upon breakaway. Preferably, circuitry is provided for artificially creating the valley when there is a change of slope in the torque signal above a given threshold level. This artificially created valley is detected by a negative peak detector whose output is generally closely associated with the amount of torque originally applied to the fastener.

REFERENCES:
patent: 2888825 (1959-06-01), Krafft
patent: 3995477 (1976-12-01), Almond
patent: 4074772 (1978-02-01), Jonsson
patent: 4244213 (1981-01-01), Marcinkiewicz

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