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:
Oct. 22, 2002
Filed:
Jan. 23, 2002
Uto Plank, Freising, DE;
Martin Richter, Freising, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A percussion mechanism for an electrical hand-held power tool including a guide tube, a percussion piston ( ) axially displaceable in the guide tube ( ), an anvil ( ) for impacting a working tool and axially displaceable together with the percussion piston ( ), a gas spring ( ) provided on an axial side of the percussion piston ( ) remote from the anvil ( ), an air channel ( ) for aeration of the gas spring ( ) and extending between an axial region of the gas spring ( ) and an axial region of the anvil ( ) outwardly of the inner surface of the guide tube ( ), and a ventilation opening ( ) for communicating the air channel ( ) with a surrounding environment and which is closed by the anvil ( ) in its operational position.