Apparatus and method for determining torque, presenting digital torque readout and automatic cycling and termination of wrench operation in a torque wrench system
US4791838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1986 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Nov 12, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D17/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.