Power plants – Pressure fluid source and motor – Having a signal – indicator or inspection means
Patent
1985-06-20
1987-04-07
Look, Edward K.
Power plants
Pressure fluid source and motor
Having a signal, indicator or inspection means
60433, 60445, 60459, 91445, 91459, 417218, F16D 3100
Patent
active
046550399
ABSTRACT:
A hydraulic lifting and lowering system for battery-powered lift trucks includes an electronic control system which reduces or limits operator selected lifting commands in accordance with the current being drawn by an electric motor connected to drive a variable-displacement pump, and in accordance with the state-of-charge of the vehicle battery, to control a proportional valve which meters fluid flow to a lift cylinder.
REFERENCES:
patent: 3372544 (1968-03-01), Kirkwood
patent: 3385169 (1968-05-01), Hale et al.
patent: 3387453 (1968-06-01), Suggs
patent: 4074529 (1978-02-01), Budzich
patent: 4099378 (1978-07-01), Shaffer
patent: 4205592 (1980-06-01), Haussler
patent: 4375747 (1983-03-01), Friedrich
McCabe Paul P.
Woolston James
Look Edward K.
Stephens Richard G.
The Raymond Corporation
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