发明名称 |
DOWN-THE-HOLE ROCK DRILL |
摘要 |
The present down-the-hole rock drill is characterized in a combination of features where the first feature is that the lower portion (18a; 18'a) of the shank (18; 18') of the drill bit (19)/guide device (19') is given a cross-sectional shape that is a multi-lobed figure that is continuously non-concave and the second feature is that the upper portion (18b; 18'b) of the shank (18; 18') of the drill bit (19)/guide device (19') is provided with a shoulder means (21; 21') on said second portion (18b; 18'b) of the shank (18; 18'). |
申请公布号 |
WO9315299(A1) |
申请公布日期 |
1993.08.05 |
申请号 |
WO1993SE00019 |
申请日期 |
1993.01.18 |
申请人 |
SANDVIK AB |
发明人 |
HEDLUND, JAN-GUNNAR;HEDSTROEM, LEIF |
分类号 |
E21B17/046;E21B4/06;E21B4/12;E21B10/38;E21B17/07 |
主分类号 |
E21B17/046 |
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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