Fork lift hydraulic servo control valve

Details Fork lift hydraulic servo control valve Fork lift hydraulic servo control valve

1978-09-11

1980-01-08

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60468, 60477, 91392, F15B 1522

Patent

active

041821262

ABSTRACT:
A servo controlled, proportional valve is connected in parallel with a forklift truck control valve to regulate the speed at which the fork is raised or lowered by shunting the forklift pump output to the hydraulic fluid reservoir during the raising of the fork and by restricting the return flow of fluid from the lift jack during lowering of the fork with the setting of the proportional control valve being servo controlled in response to a fork height sensor.

REFERENCES:
patent: 453980 (1891-06-01), Matthews
patent: 817691 (1906-04-01), Brandt
patent: 959786 (1910-05-01), Neal
patent: 2359112 (1944-09-01), Hymans
patent: 3570243 (1971-03-01), Comer et al.
patent: 4062269 (1977-12-01), Chichester

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