Torque sensing, automatic shut-off and reset clutch for screwdrivers, nutsetters and the like
US4880064A · kind A · utility
32Cited by
18References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1987 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Nov 5, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/141
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improved torque control and fluid shut-off mechanism for a fluid operated tool includes a bit holder and driving clutch member which are connected for uniform cojoint axial movement and independent rotary movement. Spring biased ball bearings provides for cojoint rotary movement which is overcome when the spring biasing force associated with the driving clutch member exceeds a threshold level. A locking sleeve fitted over the driving clutch member cooperates with a control rod for the fluid inlet to the rotary vane air motor to control initiation of operation, termination of operation, and resetting of the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.