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:
Aug. 01, 2017
Filed:
Nov. 07, 2014
Drebo Werkzeugfabrik Gmbh, Athshausen, DE;
Martin Stumpp, Ravensburg, DE;
Alexander Zurn, Altshausen, DE;
Peter Kehrle, Biberach, DE;
Tobias Berg, Pfullendorf, DE;
DreBo Werkzeugfabrik GmbH, Athshausen, DE;
Abstract
A drill with a drill flute () includes symmetrical fluted lands () helically extend around a core, wherein grooves () remain between the fluted lands, said grooves having a width () that exceeds the spine thickness or width () of the fluted lands (), and wherein the grooves () comprise a convex core reinforcement () at the groove bottom thereof. The width () of the fluted lands () at the drill head side end () is smaller than at the shank side end () of the drill helix (), and at least increases in certain areas. The core reinforcement () at the drill head side end () is more convex than at the shank side end (), thus has larger radii ().