Sliding pressure control valve for pneumatic hammer drill
US8006776B1 · kind B1 · utility
3Cited by
12References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 3, 2009 |
| Grant date | Aug 30, 2011 |
| Priority date | — |
| Expiry date | Sep 25, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pneumatic device control apparatus and method comprising a ported valve slidably fitted over a feed tube of the pneumatic device, and using a compliant biasing device to constrain motion of the valve to provide asymmetric timing for extended pressurization of a power chamber and reduced pressurization of a return chamber of the pneumatic device. The pneumatic device can be a pneumatic hammer drill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.