发明名称 |
INTERNALLY DAMPENED PERCUSSION ROCK DRILL |
摘要 |
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. |
申请公布号 |
EP2257684(A4) |
申请公布日期 |
2011.08.31 |
申请号 |
EP20090716546 |
申请日期 |
2009.03.06 |
申请人 |
PATTERSON, WILLIAM N.;PATTERSON, GLENN |
发明人 |
PATTERSON, WILLIAM N.;PATTERSON, GLENN |
分类号 |
E21B4/14;B23B47/00;B25D9/00;B25D17/24 |
主分类号 |
E21B4/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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