Drilling head

- Diamant Boart Craelius AB

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Description

FIG. 1 is a bottom, right side and rear perspective view of a drilling head showing our new design;

FIG. 2 is a top, left side and front perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a bottom perspective view thereof; and,

FIG. 7 is a top plan view thereof.

Referenced Cited
U.S. Patent Documents
418903 January 1890 Weiss
4558975 December 17, 1985 Hale
4950108 August 21, 1990 Roos
Patent History
Patent number: D334016
Type: Grant
Filed: Oct 22, 1990
Date of Patent: Mar 16, 1993
Assignee: Diamant Boart Craelius AB (Marsta)
Inventors: Gunnar Jonsson (Taby), Leo Holmsten (Knivsta)
Primary Examiner: Alan P. Douglas
Assistant Examiner: Antoine D. Davis
Law Firm: Barnes & Thornburg
Application Number: 7/601,326
Classifications