Hydraulic control system

Details Hydraulic control system Hydraulic control system

1978-09-22

1980-08-05

Geoghegan, Edgar W.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

91530, 414621, 414660, 60484, F15B 1116

Patent

active

042156220

ABSTRACT:
A hydraulic control circuit especially for use with multi-function hydraulic devices, such as for industrial lift truck attachments, in which a combination of valve means are adapted to operate two or more hydraulic systems, the valve system being designed such that a minimum number of hydraulic conduits are required to connect the main hydraulic system to the hydraulic devices, as from a lift truck to an attachment supporting carriage on a lift truck upright, and no electric lines are required to be connected to switching devices between the hydraulic devices, such as to solenoid operated valves.

REFERENCES:
patent: 2754018 (1956-07-01), Schroeder
patent: 2870553 (1959-01-01), Temple
patent: 3462028 (1969-08-01), Pi
patent: 3491905 (1970-01-01), Pi
patent: 3692198 (1972-09-01), Lake
patent: 3709252 (1973-01-01), Bishop
patent: 3837515 (1974-09-01), Ohta
patent: 3865013 (1975-02-01), Mastaj

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