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. 29, 2011
Filed:
Jul. 31, 2007
Wolfgang Rieger, Weingarten, DE;
Helmut Duscha, Ravensburg, DE;
Wolfgang Rieger, Weingarten, DE;
Helmut Duscha, Ravensburg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a rock drill () for rotational and percussive action, comprising a drill head (), a conveying helix (), a clamping shank and a longitudinal drill axis (L), wherein the drill head () has at least one secondary cutting element () with a front and a rear side face () and wherein the secondary cutting element () has a center of mass (M) and a cutting edge (), the center of mass (M) and the cutting edge () defining a first plane (E), the front side face () of the secondary cutting element () defining a second plane (E) and the rear side face () of the secondary cutting element () defining a third plane (E). In this arrangement, the longitudinal drill axis (L) intersects the first plane (E) at a first point of intersection (S), the longitudinal drill axis (L) intersects the second plane (E) and/or the third plane (E) at a second and/or third point of intersection (S, S), the longitudinal drill axis (L) and the first plane (E) form a first acute angle () in the direction of advancement (x) of the rock drill () and the longitudinal drill axis (L) and the second and/or third plane (E, E) form a second and/or third acute angle () in the direction of advancement (x) of the rock drill ().