Hydraulic unit for driving a tool

Details Hydraulic unit for driving a tool Hydraulic unit for driving a tool

1990-09-26

1992-04-21

Look, Edward K.

Power plants

Pressure fluid source and motor

Pump means moves motive fluid from one chamber to an...

91444, 91465, 91428, F16D 3102, F15B 1100

Patent

active

051056224

ABSTRACT:
A hydraulic cylinder has a piston in it with a rod projecting out of the cylinder and connectable with a tool which is operable by movement of the piston rod. A high pressure space is defined in the cylinder at one side of the piston and a low pressure space is defined at the other side of the piston. A partition defines the other end of the low pressure space. A diaphragm on the other side of the partition defines an equalizing space between the diaphragm and the partition. A low pressure line is in communication with the low pressure space and with the equalizing space. A change over valve in the lines to both the high pressure space and the low pressure space enables connection of high pressure from a pump either to one space or to the other space in the cylinder while always permitting communication from the low pressure line to the equalizing space, the connection to the equalizing space is in the low pressure line between the change over valve and a non-return valve at the pump.

REFERENCES:
patent: 2372393 (1945-03-01), Ray
patent: 3875850 (1975-04-01), Reynolds et al.
patent: 4149450 (1979-04-01), Schleicher
patent: 4343228 (1982-08-01), Wallis
patent: 4513979 (1985-04-01), Silverman

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