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:
Jul. 08, 1986
Filed:
Sep. 14, 1984
Applicant:
Inventors:
Assignee:
Santrade Limited, Lucerne, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
175410 ; 175413 ; 175415 ;
Abstract
A rock drill bit of the impact type comprising a boring head, a shaft having ridges, a front surface and a number of peripherally spaced holes receiving inserts, said holes extending forwardly and outwardly at an acute angle .phi. with respect to the center line of the drill bit. The guiding surface of the insert mainly coincides with the jacket surface of the bit body when the insert has been fixed in the hole which emerges into both the jacket surface and the front surface of the bit body. This means that the guiding surface partly extends on both sides of the plane of the front surface.