Load lifting and lowering control system

Details Load lifting and lowering control system Load lifting and lowering control system

1976-08-23

1978-01-03

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60461, 60468, 91444, F16H 3946

Patent

active

040659224

ABSTRACT:
A hydraulic control arrangement for the lifting and lowering of loads is disclosed. The system is illustrated in an industrial truck and includes a multiple element control valve with timing circuitry to eliminate unwanted transient pressure surges during valve actuation. Series-parallel oil flow paths are provided for directing and controlling oil from the load lifting cylinder to the oil reservoir when the load is being lowered.

REFERENCES:
patent: 1972462 (1934-09-01), Schafer
patent: 2608824 (1952-09-01), Kirkham
patent: 3878679 (1975-04-01), Sievenpiper

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