Internally dampened percussion rock drill
US7681664B2 · kind B2 · utility
Inventors
Key dates
| Filing date | May 1, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | May 1, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D17/245
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A percussion drill, and methods of using the same, including a shank in mechanical alignment with a piston-hammer and a valve in fluid communication with the piston-hammer. The percussion drill further includes an internal hydraulic dampening system for reducing the velocity of the piston-hammer when the shank is forward of a power position relative to the velocity of the piston-hammer when the shank is in a power position. Preferably, the internal hydraulic dampening system includes mechanical alignment of a portion of the piston-hammer with a port in fluid communication with the valve, operable to reduce fluid flow into an area surrounding the valve when the piston-hammer is forward of its position relative to its normal operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.