Tool driving or impacting – Impacting devices – Hammer head driven by pulsating fluid pressure
Reexamination Certificate
2005-09-06
2005-09-06
Huynh, Louis K. (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head driven by pulsating fluid pressure
C173S109000, C173S117000, C173S118000, C173S200000, C173S202000, C173S209000
Reexamination Certificate
active
06938704
ABSTRACT:
The invention relates to a pneumatic percussive tool for a paving breaker and/or a hammer drill comprising a drive piston which is displaceable both backwards and forwards by a crankshaft and arranged in a percussion piston which is displaceable both backwards and forwards. A hollow chamber is connected to a compensating chamber by an idling air channel and embodied between the drive piston and the percussion piston in order to receive a pneumatic spring. A valve is arranged in the idling air channel, the opening and closing position thereof depending on the rotational speed of the crankshaft. If the rotational speed of the crankshaft falls below a predetermined value, the valve opens the connection between the hollow chamber and the compensating chamber so that a pneumatic spring can no longer be to embodied in the hollow chamber and the pneumatic percussion tool is placed in a idling position.
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Berger Rudolf
Lysek Mirko
Schmid Wolfgang
Boyle Fredrickson Newholm Stein & Gratz S.C.
Chukwurah Nathaniel
Huynh Louis K.
Wacker Construction Equipment AG
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