Title:
DRILL BIT
Document Type and Number:
WIPO Patent Application WO/2011/146955
Kind Code:
A3
Abstract:
In a drill bit (1), in particular a percussion drill bit or rotary percussion drill bit, the face (3) of which has detachment tools (5) or drill pins made of hard material for detaching and/or comminuting material to be removed, the detachment tools (5) or drill pins are substantially hemispherical (15) or conical (16), and the detachment tools (5) are fastened to the face (3) of a drill head (2).
Inventors:
KARPELLUS WALTER (AT)
BOEHM KARL (AT)
BOEHM KARL (AT)
Application Number:
PCT/AT2011/000240
Publication Date:
May 03, 2012
Filing Date:
May 25, 2011
Export Citation:
Assignee:
DYWIDAG SYSTEMS INT GMBH (AT)
KARPELLUS WALTER (AT)
BOEHM KARL (AT)
KARPELLUS WALTER (AT)
BOEHM KARL (AT)
International Classes:
E21B10/56; B22F1/00; E21B10/36
Foreign References:
| EP0052584A1 | 1982-05-26 | |||
| US20090184564A1 | 2009-07-23 | |||
| DE102006060776A1 | 2008-06-26 | |||
| US20080087473A1 | 2008-04-17 |
Attorney, Agent or Firm:
CUNOW, Gerda (Teschnergasse 33/1/3, Wien, AT)
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