Torque control and fluid shutoff mechanism for a fluid operated tool
US4576270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1983 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Feb 28, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/145
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improved torque control and fluid shutoff mechanism for a fluid operated tool includes an output shaft with an axially slidable cam sleeve mounted on the shaft. The cam sleeve is coupled with a driven tool bit holder to provide a clutch connection. The cam sleeve is biased for engagement with a cam surface on the tool bit holder whereby during normal operation of the tool, the tool bit holder remains fixed relative to the cam sleeve. When a threshold torque acts on the tool bit holder, the tool bit holder rotates relative to the cam sleeve axially driving the cam sleeve to release a biased kickout sleeve from retaining a radially displaceable member. The radially displaceable member engages a throttle rod and a thrust pin. The throttle rod extends to a fluid control valve which controls inlet fluid. Release of the radially displaceable member from being retained by the kickout sleeve permits axial translation of the throttle rod to terminate fluid flow to the motor of the tool. The throttle rod is also responsive through the thrust pin to the position of a tool bit mounted in the tool bit holder to open the fluid flow to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.