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. 10, 1998
Filed:
Jan. 08, 1997
Maurice Jean Cabaret, Ponthierry, FR;
Christian Thierry Daude, Vaux Le Penil, FR;
Daniel Marcel Lavocat, Ballancourt, FR;
Jean Pierre Leboulanger, Chartrettes, FR;
Michel Lebrun, Machault, FR;
Francedilla.ois Masson, Evry, FR;
Gilles Rouge, Dourdan, FR;
Bernard Gilbert Roy, Volgre, FR;
Abstract
The cutting end or head of a helically grooved drill bit is of generally hemispherical shape and has four cutting lips, two of which are disposed in end-to-end relationship at the point S of the bit. The cutting angle of the edge of each lip is evolutive, varying from 0.degree. at the point S to a value, determined experimentally in accordance with the material to be machined, at a position P at the intersection of the cutting edge with the end of the outer diameter d of the bit.