Title:
DRILL HEAD
Document Type and Number:
Japanese Patent JP2011058194
Kind Code:
A
Abstract:
To provide a drill head improved in drilling efficiency without a possibility of loosening in screw joining between the drill head and a cleaning swivel even if an drill rod is separated or additionally joined.
In the drill head, a shank rod, a rotation drive device for rotating the shank rod, and a hammering device for hammering the shank rod are embedded in a transmission housing. A joint adaptor rotatable with the shank rod is integrally connected to the lower end of the shank rod. The section of the joint adaptor is covered with a seal case continuously provided for the transmission housing to form the cleaning swivel.
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Inventors:
HAGA KAZUO
Application Number:
JP2009206733A
Publication Date:
March 24, 2011
Filing Date:
September 08, 2009
Export Citation:
Assignee:
YAMAMOTO ROCK MACHINE CO LTD
International Classes:
E21B6/02; E21B17/02; E21B17/05
Domestic Patent References:
JPH1037645A | 1998-02-10 | |||
JPH0477689A | 1992-03-11 | |||
JP2001173358A | 2001-06-26 |
Attorney, Agent or Firm:
Sadanobu Shimizu