Apparatus and method of determining torque, presenting digital torque readout and automatic cycling and termination of wrench operation
US4864903A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1988 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Jun 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D17/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatus and a method are presented for determining the torque load applied to a fastening element by a fluid powered wrench, and displaying a digital readout of the torque. The operating pressure of the wrench, after compensation for the temperature of the pressure transducer, is converted to a torque measurement by a programmed microprocessor and the torque value is displayed on a digital readout. The system is useable with and adjusts for wrenches of several sizes by an input selector switch connected to the microprocessor. Apparatus and method are also presented for automatic cycling of a ratcheting hydraulic powered wrench and automatic termination of the tightening process when a predetermined torque has been delivered to the fastening element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.