Height control system with multiple control valves

Details Height control system with multiple control valves Height control system with multiple control valves

1987-09-28

1989-03-07

Weiss, John

Harvesters

Motorized harvester

With condition-responsive operation

56 28, A01D 4608

Patent

active

048094870

ABSTRACT:
Height sensing structure utilizing a pair of height sensing valves connected to height sensing shoes on two row harvesting units. The row harvesting units are transversely adjustable on support structure to accommodate different row spacings and to open up space between the units for service and inspection. The height control valves are connected by flexible conduit and a shuttle check valve to a lift cylinder, and interconnecting linkages between the height sensing shoes on adjacent units are eliminated so that the units may be freely adjusted. The shuttle valve assures that the height control valve sensing the highest ground condition controls the lift cylinder to prevent "digging in".

REFERENCES:
patent: 3196599 (1965-07-01), Meiners
patent: 3417553 (1968-12-01), Hubbard
patent: 4229931 (1980-10-01), Schlueter et al.
patent: 4327540 (1982-05-01), Swanson et al.
patent: 4335561 (1982-06-01), Swanson et al.

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