Down-the-hole drill hammer |
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| 申请号 | EP88303089.2 | 申请日 | 1988-04-07 | 公开(公告)号 | EP0288180A3 | 公开(公告)日 | 1989-11-23 |
| 申请人 | Seismic Supply International Pty Ltd; | 发明人 | Seismic Supply International Pty Ltd; | ||||
| 摘要 | A valveless-type down-the-hole hammer drill which has an inner tube (115) extending from the upper end of the hammer body (111) into a central opening in a cutter bit (113) reciprocably mounted in a chuck (112) on the opposite end of the hammer body. High pressure fluid is supplied to the interior of the inner tube (115) and a piston (125) surrounding the inner tube (115) has internal surfaces controlling connection of a port (115 a ) to chambers (126, 127) above and below the piston. The external surface of the piston controls connection of these chambers to an exhaust port (112 b ). A valve sleeve (112 c ) on the chuck (112) coacts with the piston in this respect. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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