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:
Mar. 15, 2016
Filed:
May. 24, 2013
Applicant:
Black & Decker Inc., Newark, DE (US);
Inventors:
Andreas Hammer, Tittling, DE;
Steve Brocket, Durham, GB;
Christoph Gastinger, Hutthum, DE;
Christian Bluemel, Waldkirchen, DE;
Assignee:
Black & Decker Inc., New Britain, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 10/44 (2006.01); B23B 51/02 (2006.01); B28D 1/14 (2006.01); E21B 10/58 (2006.01);
U.S. Cl.
CPC ...
E21B 10/44 (2013.01); B23B 51/02 (2013.01); B28D 1/146 (2013.01); E21B 10/58 (2013.01); B23B 2226/75 (2013.01); B23B 2251/18 (2013.01); B23B 2251/44 (2013.01);
Abstract
A cutting head for a drill bit comprises four substantially identically shaped cutting arms extending radially from a common central axial point, each cutting arm comprising a cutting edge extending, outwardly and axially backwards from the common central axial point. The cutting edges are equianguiarly spaced apart from each other about the central axis of the cutting head. Each cutting, arm further comprises a side chamfer extending between its radially outer face and its rotationally trailing side face.