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. 27, 1994
Filed:
Oct. 22, 1992
Applicant:
Inventors:
Kent Peay, Bristol, TN (US);
Jan Akerman, Stockholm, SE;
Assignee:
Sandvik Rock Tools, Inc., Bristol, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
1754201 ; 175426 ;
Abstract
An insert for use in a roof bit for drilling bolt holes in a mine roof includes a pair of cutting edges interconnected by a chisel edge. Each cutting edge is formed by an intersection of front and side faces of the insert. Each side face further includes at least one chamfer intersecting the respective cutting edge and the chisel edge to divide that cutting edge into inner and outer sections, each of which being sharper than the chisel edge.