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US 5,667,022 AGranted
Hydraulic impact device with continuously controllable impact rate and impact force
AssigneeDeilman-Haniel GmbH
InventorDieter Gude
Life of this patent
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AssigneeDeilman-Haniel GmbH
InventorDieter Gude
Estimating the term…
An impact device 1 that is continuously controllable in terms of impact rate and impact force contains a percussion piston 25 that can move back and forth in the inner boring of the cylinder 3, and that is controlled via a rotary valve 15 having as rotary engine 16. The rotary valve 15 and the rotary engine 16 are positioned separately from the percussion piston 25, either on or in the cylinder 3, and are linked only via portings 20, 22, 24 to the pump connection 21 and the tank connection 23, or to the double-sided piston areas A1, A2, so that the valve can be used with practically any type of impact device, without requiring substantial alteration of its structural dimensions. In addition, an advantageous continuous control of impact rate and impact force with a constant power output is ensured.
Hydraulic impact device comprising a housing having a cylinder, a tubing having an end connected to the cylinder, a turning gear connected to the tubing, a percussion piston connected to the cylinder and movably positioned in an inner boring, said piston acting upon the tubing while moving back and forth in the inner boring, a control system for controlling the movement of the piston, a rotary valve provided in the control system, a first rotary engine connected to the rotary valve for driving the rotary valve, wherein the rotary valve and the first rotary engine are mounted separately from the percussion piston on the housing and removable therefrom, a pump and a tank connected to the system, plural portings connecting the first rotary engine to the pump and the tank and to the piston.
The device of 1, further comprising plural tap holes connected to the portings and to an outer wall of the cylinder.
Dependencies are inferred from the claim text.