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:
Jan. 30, 1996
Filed:
Nov. 14, 1994
Josef Obermeier, Peiting, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
An axially elongated rock drill has a chucking shank section (1) at one end and a drilling tip (2) at the opposite end, helically arranged first grooves (3, 4) are located in the outside surface of the drill and extend from adjacent the drilling tip towards the chucking shank section. Helically arranged lands (R) are located between the first grooves and form the outside surface of the drill. The lands have helically arranged auxiliary second grooves located between helically arranged guidance regions (7, 8, 9, 10). Accordingly, the second grooves are spaced from the first grooves by the guidance regions. The width (BH) of the first grooves (3, 4) is approximately twice the total width (BG) of the lands, that is, the width of the two guidance regions and one second groove.