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. 12, 2000
Filed:
Feb. 18, 1999
Werner Kleine, Achim, DE;
Udo Hauptmann, Munich, DE;
Harald Geiger, Kaufering, DE;
Anton Knoller, Landsberg, DE;
Josef Starkmann, Horlach, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A drill including a shank (1) for connecting the drill with a drive tool, a stem (2) adjoining the shank (1) and having at most two helical discharge grooves (6, 7) opening toward a stem circumference, a head (3) provided at an end of the stem (2) remote from the shank (1) and having a diameter substantially corresponding to the stem diameter, with the head (3) having three radially extending recesses (8) provided in its free end surface and opening toward a head circumference, with the recesses being provided with at least one hard metal bit (9) provided with cutting portions (9a) extending from a central portion (9b) to the head circumference, and with the head (3), having three grooves (10, 11, 12) arranged between the three recesses (8), opening toward the head circumference, and connected with the discharge grooves.