Patent ID: 6119796
Filing Date: 2000-09-19
Classification: B25D

Abstract:
A pneumatic spring percussion mechanism, havingan axially movable driving piston (11);a percussion piston (13) which is axially movable in the driving piston;a front pneumatic spring (15) which is formed between the driving piston and a front side of the percussion piston; and havinga rear pneumatic spring (18) which is formed between the driving piston and a piston rear side (17) which is opposite the front side;the front pneumatic spring being supplied with air via a ventilation aperture (20) leading from the front pneumatic spring to atmosphere,wherein the rear pneumatic spring (18) is supplied with air via a charging aperture (19) which connects the rear pneumatic spring to the front pneumatic spring (15), the ventilation aperture and the charging aperture being alternately opened and closed by the percussion piston (13) during movement of the percussion piston.