Blade lift float circuit for motor graders

Details Blade lift float circuit for motor graders Blade lift float circuit for motor graders

1975-03-20

1977-07-12

Cohen, Irwin C.

Earth working

Mounting for pushed tool at end of motor vehicle

Transversely mounted blade

91411B, 91437, 91438, E02F 376, F15B 1304, F15B 1308

Patent

active

040348156

ABSTRACT:
A construction vehicle, such as a motor grader, comprises a work tool mounted thereon and adapted to be selectively moved by at least one double-acting hydraulic cylinder. A fluid circuit comprises a pressurized fluid source adapted to communicate fluid to the cylinder via a first control valve. A normally closed second control valve is operatively connected between a storage tank of the fluid source and the rod and head ends of the cylinder for exhausting fluid therefrom to the tank directly upon actuation of an independent actuation means. Opening of the second control valve will thus place the cylinder in a "float" condition of operation.

REFERENCES:
patent: 2517164 (1950-08-01), Arps
patent: 2909342 (1959-10-01), Maltby
patent: 3381587 (1968-05-01), Parquet
patent: 3415057 (1968-12-01), Rosenberg
patent: 3472127 (1969-10-01), Scheidt
patent: 3543647 (1970-12-01), Hall et al.
patent: 3608431 (1971-09-01), Pease
patent: 3630121 (1971-12-01), Lund et al.
patent: 3709103 (1973-01-01), Dukhovny et al.
patent: 3730207 (1973-05-01), Christensen
patent: 3757646 (1973-09-01), Rohner
patent: 3872670 (1975-03-01), Dezelan et al.

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