Retorque measuring apparatus
US4244213A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1979 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | Mar 15, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L5/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
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. A positive peak detector senses the maximum positive output of the transducer before the signal begins to decrease. A negative peak detector senses the minimum negative output of the transducer before the signal again increases. The negative peak detector is energized by a switching network upon detection of a negatively sloped signal from the transducer. A display coupled to the output of the negative peak detector provides a visual indication of the valley torque which is closely associated with the amount of torque originally applied to the fastener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.