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:
Apr. 13, 2004
Filed:
Feb. 06, 2002
Hans-Werner Bongers-Ambrosius, Munich, DE;
Tim Pröls, München, DE;
Hilti Aktiengesellschaft, Schann, LI;
Abstract
A suction drill unit for the installation of a drill dowel ( ) into rock, concrete, masonry and similar materials has an insertion end ( ) for insertion into an at least partially rotary and percussive acting hand tool drilling device, with a reduced diameter shank ( ) having an open suction passageway ( ) extending axially through the shank ( ) towards a bit head ( ) and a rearward radial communication passage ( ) connected thereto for suction-tight communication with a non-rotary suction head ( ), wherein the drill bit head ( ) is formed with an eccentrically arranged bit head tip ( ) for boring of a hole ( ) having a diameter (D) greater than that of the drill bit head diameter (B).