Torque wrench
US4403530A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1981 |
| Grant date | Sep 13, 1983 |
| Priority date | — |
| Expiry date | Jan 12, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/1427
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A torque wrench comprising a driving head, an operating arm and an adjustable torque limit signalling means characterized by: PA1 a first arm drivingly connected with the driving head, PA1 a second arm pivotally coupled to the driving head, PA1 a torque limit signalling assembly slidably adjustable in position along one of the arms for selecting a torque limit, PA1 the assembly including a non-linear spring means arranged to transmit force between the arms and to signal the occurrence of an abrupt change in spring force in accordance with the selected limit. Preferably the non-linear spring is constituted by a disc washer, and one of the arms is calibrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.