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:
Jan. 26, 2016
Filed:
Mar. 07, 2013
Applicants:
Jimmy Carlsson, Fagersta, SE;
Goran Stenberg, Fagersta, SE;
Mattias Rehnstrom, Fagersta, SE;
Inventors:
Assignee:
Atlas Copco Secoroc AB, Fagersta, SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 10/42 (2006.01); B24B 31/02 (2006.01); B24B 31/06 (2006.01); B24B 31/00 (2006.01); C21D 7/04 (2006.01); C21D 9/22 (2006.01); C22C 29/02 (2006.01); E21B 10/56 (2006.01);
U.S. Cl.
CPC ...
B24B 31/00 (2013.01); B24B 31/02 (2013.01); B24B 31/06 (2013.01); C21D 7/04 (2013.01); C21D 9/22 (2013.01); C22C 29/02 (2013.01); E21B 10/56 (2013.01);
Abstract
Drill bit () for a rock drilling tool (), and a method of increasing the toughness of the drill bit, which drill bit () has a drilling surface () that contacts rock during drilling. A longitudinal cross section () of the drill bit () through the drilling surface () exhibits certain relationships of Ltot(depth)/Ltot(5.0) and H(depth)/H(5.0) at the specified depths, along the drill bit's longitudinal axial center line (C) if the drill bit has a length (L) of 10 mm or greater, and Ltot(depth)/Ltot(3.5) and H(depth)/H(3.5) at the specified depths, if the drill bit has a length (L) of 10 mm or less.