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:
Sep. 16, 1986
Filed:
Apr. 15, 1985
Jan Siden, Skellefte.ang., SE;
Finsliparna AB, Skellefte.ang., SE;
Abstract
An abrasive wheel for grinding a drill bit of the kind having hard metal inserts set into a head includes two circular flange portions and a circumferential profile groove between the flange portions corresponding to the end profile intended for drill bit insert. The flange portions (7, 8) and interposed profile groove (10) are included in a first abrasive wheel body (3) having a covering coating of abrasive agent such as diamond, adapted to grind hard metal. At least one other abrasive wheel body (4), is nonrotatable and concentrically connected to one flange portion (7 or 8) of the first abrasive wheel body and, at a greater radial distance from the rotary shaft of the abrasive wheel than the adjacent flange portion of the first abrasive wheel body, has a circumferential end portion (15) having a substantially round cross-sectional form and a coating (16) of an abrasive agent, e.g. boron nitride, adapted to grind the material in the drill bit head.