Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Patent
1986-10-24
1988-04-05
Look, Edward K.
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
417443, 417510, 417511, B21J 1534, F16D 3102
Patent
active
047350482
ABSTRACT:
The hydraulic tool of this invention includes a pressure chamber into which a fluid is pumped. A pump chamber has an inlet port and outlet port at opposite ends thereof and a pump plunger extends into the chamber with an annular space around it. An annular shoulder is provided on either the chamber or the plunger and a seal ring or sleeve fits slidably on the other component to seal against the shoulder. A spring biases the seal ring against the shoulder, and when the pump is extended to force fluid out the outlet port, the pressure in the chamber augments the spring force. Then, when the rod is retracted to create a void, fluid in the reservoir forces the seal ring or sleeve away from the seat surface to enter the inlet port.
REFERENCES:
patent: 3867072 (1975-02-01), Brenneman
patent: 4102611 (1978-07-01), Broker
patent: 4263801 (1981-04-01), Gregory
patent: 4498293 (1985-02-01), Gregory
Look Edward K.
Stidham Melvin R.
The Gregory Company
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