Pneumatic system for combine header height control

Details Pneumatic system for combine header height control Pneumatic system for combine header height control

1985-02-19

1986-06-17

Hirsch, Paul J.

Harvesters

Motorized harvester

With selective control of drive means

56208, A01D 4106, A01D 7518

Patent

active

045948402

ABSTRACT:
A pneumatic system for automatically controlling the height of a crop harvesting header on a combine is disclosed wherein the pneumatic system includes a cylinder which receives compressed air through pneumatic directional valves mounted on the crop harvesting header and actuated through ground sensors positioned under the header. The flow of compressed air from the directional valves operates a pneumatic cylinder, which in turn drives a hydraulic valve controlling the hydraulic header lift mechanism to move the header relative to the frame of the combine to maintain the relative position of the header to the ground. The pneumatic cylinder is also actuated to effect a raising of the crop harvesting header by another pneumatic directional valve connected to a control lever for shifting the primary drive of the combine to a reverse direction, thereby automatically raising the header when the combine is moved in a reverse direction.

REFERENCES:
patent: 3698164 (1972-10-01), Boone et al.
patent: 3722193 (1973-03-01), Strubbe
patent: 3728851 (1973-04-01), Van Antwerp
patent: 3805497 (1974-04-01), Ross
patent: 3886718 (1975-06-01), Talbot
patent: 3908345 (1975-09-01), Oni et al.
patent: 3953959 (1976-05-01), Decruxenaere
patent: 4261161 (1981-04-01), Colgrove et al.
patent: 4335561 (1982-06-01), Swanson et al.
patent: 4337611 (1982-07-01), Maclander et al.
patent: 4470243 (1984-09-01), Rayfield

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