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:
Nov. 04, 2003
Filed:
Apr. 11, 2002
Erich Wisser, Bregenz, AT;
Marcel John, Mels, CH;
Bernhard Sander, Feldkirch, AT;
Hanspeter Schad, Grabs, CH;
Cord-Henrik Surberg, Feldkirch, AT;
Charles Coffin, Chur, CH;
Joachim Vedder, Hergensweiler, DE;
Reinhard Lins, Sevelen, CH;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A percussion bores for forming borer in a stone material and including a chisel stem ( ) having a prismatic cross-section and provided with a chiseling head ( ) and at least one radial opening ( ), a twist drill ( ) extending through the cylindrical through-bore ( ) of the chisel stem and projecting beyond the chiseling head ( ), a drilling head ( ) with cutting elements ( ) provided at the projecting end of the twist drill and a shank ( ) provided at another end of the twist drill, and a stop ( ) provided between the shank ( ) and the chisel stem ( ), with a drill stem being offset radially inwardly with respect to an outer diameter of the shank in the region of the stop.