Mining or in situ disintegration of hard material – Hard material disintegrating machines – Percussive-type cutter
Reexamination Certificate
2005-11-01
2005-11-01
Kreck, John (Department: 3673)
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Percussive-type cutter
C173S206000
Reexamination Certificate
active
06959967
ABSTRACT:
A fluid-powered impact vibrator (5), in particular a hydraulic hammer, comprising a fluid-powered percussion hammer (8) with a percussion piston (18) that is moved back and forth under the effect of a control means (10) and comprising a guide unit (7) on which the percussion hammer is supported, wherein the impact vibrator is additionally provided with a control valve, designed as a pressure monitor, for adaptation to the supplied input power. The control valve preferably is a pressure shut-off valve or a pressure-limiting valve (25) that is connected to the input pressure line (3) provided with the operating pressure, and automatically stops the percussion hammer (8) if the operating pressure resulting from the input power exceeds a specified maximum value. To stop the percussion hammer (8), either the pressure line (3) is blocked or the control means (10) is held in one of its end positions, i.e., the operating stroke or the return stroke positions. Moreover, the pressure shut-off valve or the pressure-limiting valve (25) preferably is a component of the guide unit, consisting of a support frame (7), or the percussion hammer (8) itself.
REFERENCES:
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Geimer Marcus
Prokop Heinz-Jürgen
Kinberg Robert
Kreck John
Krupp Berco Bautechnik GmbH
Venable LLP
Voorhees Catherine M.
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