Hydraulic circuit for hydraulic cylinder

Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy

Reexamination Certificate

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Details

C060S469000, C092S109000

Reexamination Certificate

active

07047734

ABSTRACT:
A hydraulic circuit for a hydraulic cylinder capable of executing and adjusting a shock absorbing function at the time of stopping the operation of a cylinder piston rod and releasing the function, comprises a damping control valve (v1) having a first switching position (v11) which blocks the connection of the accumulation port (22) with outside and performs supply and discharge or discharge and supply of the operating oil with respect to the first cylinder chamber (3) and the second cylinder chamber (4), a second switching position (v12) connecting at least the accumulation port (22) and the second cylinder chamber (4), and a third switching position (v13) connecting at least the accumulation port (22) and the first cylinder chamber (3).

REFERENCES:
patent: 3563136 (1971-02-01), Valente
patent: 3779135 (1973-12-01), Sugimura
patent: 3869861 (1975-03-01), Case
patent: 4341149 (1982-07-01), Dezelan
patent: 1 236 384 (1971-06-01), None
patent: 1 306 609 (1973-02-01), None
patent: 2 000 227 (1979-01-01), None
patent: 2 016 980 (1979-10-01), None
patent: 49-104075 (1974-10-01), None
patent: 804792 (1981-02-01), None
patent: 876890 (1981-10-01), None

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