Hydraulic system for electric lift trucks

Details Hydraulic system for electric lift trucks Hydraulic system for electric lift trucks

1976-03-31

1977-02-22

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60468, 60486, 60DIG2, F15B 1309

Patent

active

040085716

ABSTRACT:
An energy conserving hydraulic system for a lift truck or the like including a hydraulic tilt cylinder and a hydraulic lift cylinder subject to varying load requirements, manually operable valves for controlling the cylinders, a first, high volume hydraulic pump, a second, low volume hydraulic pump, a reversible, bidirectional DC motor for simultaneously driving both the pumps, and a piping system connecting the pumps to the valves such that for one direction of drive of the motor, the first pump will deliver a high volume of hydraulic fluid to the valve for operation of the lift cylinder, and for the other direction of drive of the motor, the first pump will be unloaded. A conduit is also arranged such that for the other direction of drive, the second pump will deliver a low volume of hydraulic fluid to the valve for directing the same to the tilt cylinder. An electrical direction control for controlling the direction of drive is responsive to the valves.

REFERENCES:
patent: 2780918 (1957-02-01), Rohrscheib
patent: 3864911 (1975-02-01), Gellatly et al.

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