Title:
ドリルブッシング
Document Type and Number:
Japanese Patent JP2008517779
Kind Code:
A
Abstract:
The invention relates to a drill bushing for engagement with a drilling steel, wherein said drill bushing ( 2 ) has contact surfaces ( 4 ) for contact with a drilling steel ( 1 ), said contact surfaces ( 4 ) having interior, inwards curved shapes, whereby edge abutment of a drilling steel ( 1 ) against said contact surfaces ( 4 ) is avoided. By way of the invention, a better wear picture is obtained for the shank of a drilling steel.
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Inventors:
Estlink, thomas
Application Number:
JP2007537844A
Publication Date:
May 29, 2008
Filing Date:
October 14, 2005
Export Citation:
Assignee:
Atlas Copco Rock Drills Activolag
International Classes:
B25D17/08; E21B1/02; E21B3/04; E21B6/00; E21B
Domestic Patent References:
| JPH01228781A | 1989-09-12 |
Attorney, Agent or Firm:
Takao Hamano
Morita Tetsuji
Teruichi Hirai
Morita Tetsuji
Teruichi Hirai