Torquing tool control circuit
US4074772A · kind A · utility
17Cited by
9References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Mar 4, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D17/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The control circuit receives a signal from a torque measuring device provided on the tool and determines the proper shut off point for the tool. The circuit controls not only the tool shut off but also the rate of application of torque by employing a pulsing circuit. The circuit is capable of detecting the onset of yield and can accurately and repeatedly set a fastener at a desired point in the plastic region. The onset of yield is detected by differentiating torque with respect to time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.