Hard rock percussion drill bit with paraboloid PCD inserts

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Description

FIG. 1 is a greatly enlarged side elevational view of a hard rock percussion drill bit embodying the invention.

FIG. 2 is a top plan view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is a side elevation thereof, as rotated 90° from the FIG. 1 position, and partially fragmented and broken away to illustrate the interiorly threaded bore at the bottom end; and,

FIG. 5 is a perspective view of thereof.

Claims

The ornamental design for a hard rock percussion drill bit with paraboloid PCD inserts, as shown and described.

Referenced Cited
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Other references
  • Brunner & Ray Drilling Accessories, catalog, 1997, pp. 1-13, No. 97 DRC, US.
Patent History
Patent number: D574403
Type: Grant
Filed: Mar 9, 2007
Date of Patent: Aug 5, 2008
Assignee: The William J. Brady Loving Trust (Creve Coeur, MO)
Inventor: William J. Brady (Creve Coeur, MO)
Primary Examiner: Sandra Snapp
Assistant Examiner: Patricia Palasik
Attorney: Senniger Powers LLP
Application Number: 29/277,766
Classifications
Current U.S. Class: Cutting Tool, E.g., Drill Bit, Etc. (D15/139)