Patent ID: 6467555
Filing Date: 2002-10-22
Classification: B25D

Abstract:
A percussion mechanism for an electrical hand-held power tool, comprising a guide tube (2); a percussion piston (4) axially displaceable in the guide tube (2); and anvil (5) for impacting a working tool and axially displaceable together with the percussion piston (4); a gas spring (1) provided on an axial side of the percussion piston (4) remote from the anvil (5); an air channel (9) for aeration of the gas spring (1) and extending between an axial region of the gas spring (1) and an axial region of the anvil (5) outwardly of an inner surface of the guide tube (2); and a ventilation opening (8) for communicating the air channel (9) with a surrounding environment, the ventilation opening (8) being closed by the anvil (5) in an operational position of the anvil (5).