The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1999
Filed:
Nov. 02, 1998
Applicant:
Inventors:
Kent Peay, Bristol, TN (US);
David Alexander McCloskey, New South Wales, AU;
Jan Magnus Andersson, Bristol, VA (US);
Assignee:
Sandvik Rock Tools, Inc., Bristol, VA (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
1754201 ; 175427 ;
Abstract
A rotary roof mine bit for drilling holes in the roof of a mine, comprises a bit body and an insert mounted in the bit body. The insert is formed of a hard material such as carbide or diamond. A top surface of the insert comprises two top sections which intersect a respective main surface of the insert to define first and second non-linear cutting edge. In one embodiment each cutting edge comprises a plurality of mutually angled segments. In another embodiment each cutting edge is continuously curved. Preferably an axial notch is disposed at a center of the top surface.