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:
Jul. 06, 2004
Filed:
Jul. 29, 2002
Applicant:
Inventors:
Martin Richter, Freising, DE;
Konrad Artmann, Wörthsee, DE;
Hans-Werner Bongers-Ambrosius, Munich, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 4/04 ;
U.S. Cl.
CPC ...
E21B 4/04 ;
Abstract
A percussion electrical tool including an electrical motor ( ) located in a firedamp-protected housing ( ), control electronics ( ) for controlling operation of the electric motor ( ); an inverted rectifier ( ) connecting the control electronics ( ) with the electric motor ( ); an electronic module ( ) located in the housing ( ); an intermediate wall ( ) for separating the electronic module ( ) from a portion of a housing volume in which the electric motor ( ) is located, connected with the inverted rectifier in a heat-conductive manner, and having a fluid-cooled cooling medium conduit.