Hydraulic systems for two speed lifting

Details Hydraulic systems for two speed lifting Hydraulic systems for two speed lifting

1975-08-20

1977-05-17

Blunk, Evon C.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

91411B, 91412, 187 17, B66B 920, F15B 1116

Patent

active

040236501

ABSTRACT:
Hydraulic systems particularly adaptable for use in industrial lift trucks utilizing two or more hydraulic cylinders to lift a load. The cylinders are positively connected to the load, and valve means are provided for directing pressurized fluid to the working chambers of all cylinders when heavily loaded and to fewer cylinders when lightly loaded. Other valve means are provided for directing fluid to the working chambers of the unpressurized cylinders.

REFERENCES:
patent: 1944351 (1934-01-01), Landry
patent: 2456320 (1948-12-01), Repke
patent: 2588285 (1952-03-01), Pelouch
patent: 3186309 (1965-06-01), Killebrew
patent: 3541928 (1970-11-01), Conwell et al.
patent: 3584536 (1971-06-01), Hillberry
patent: 3608434 (1971-09-01), Hillberry
patent: 3734464 (1973-05-01), Bushnell

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