发明名称 |
VALVELESS PNEUMATIC HAMMER |
摘要 |
<p>of the disclosure The specification describes a valveless pneumatic hammer of the type which is generally used in well drilling. The hammer includes a hollow casing with a backhead assembly at one end and a bit assembly at the other. A piston is adapted to reciprocate between two positions in response to fluid supply admitted thereto.</p> |
申请公布号 |
CA1266208(A) |
申请公布日期 |
1990.02.27 |
申请号 |
CA19860508775 |
申请日期 |
1986.05.09 |
申请人 |
GIEN, ABRAHAM;GIEN, BERNARD L. |
发明人 |
GIEN, ABRAHAM;GIEN, BERNARD L. |
分类号 |
E21B1/30;E21B4/14;(IPC1-7):E21C3/24 |
主分类号 |
E21B1/30 |
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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