Pneumatically powered hand tool with speed-control governor
US4057113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1976 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Aug 3, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/108
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pneumatic hand tool comprises a housing having a compressed-gas inlet and provided with a pneumatically powered motor which carries on one side a tool holder such as a chuck and on the other side a governor. A speed-control valve is operated by the governor and can close a first air passage between the inlet and the motor to maintain the motor speed below a predetermined limit. Another passage is provided which bypasses the governor-controlled speed-control valve and a valve is provided in this bypass conduit which is openable in order to allow the hand tool to operate at a speed substantially above the governor-established speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.