Instrument for adjusting and calibrating torque wrenches
US4976133A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Dec 1, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/1425
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The electric circuit of the torque indicator in a torque wrench is automatically adjusted by the electric circuit of a detachable adjusting and calibrating instrument which is separably connectable to the wrench so that its torsion bar is deformable by the torque applicator wrench. Each circuit includes a microprocessor with means for displaying the measured torque, and interfaces are provided to separably connect the microprocessors to each other preparatory to an adjusting or calibrating operation. Each circuit further comprises one or more bridge circuits with strain gages, amplifiers for signals at the outputs of the bridge circuits, and analog-digital converters for transmission of signals from amplifiers to the respective microprocessor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.