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. 13, 2002
Filed:
Sep. 07, 2000
Werner Kleine, Achim, DE;
Hans-Werner Bongers-Ambrosius, Munich, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A drill including a stem ( ) having at least two discharge grooves ( ) for discharging drilling dust and helically circumscribing the stem ( ), a drill head ( ) provided at an of the stem ( ) opposite the end provided with the shank and having a plurality of bits ( ), which are formed of hard metal and project radially beyond the drill head ( ), with the drill head having a plurality of drilling dust grooves ( ) which separate the bits and number of which exceeds a number of the discharge grooves ( ), with at least one pair of the drilling dust grooves ( ) passing into a common discharge groove ( ), and with the drill further having a helical groove section ( ) forming a common transitional region between the at least one pair of the drilling dust grooves ( ) and the common discharge groove and the passing cross-section of which is smaller than the passing cross-section of the common discharge groove.