Hydraulic height sensing system with cylinder by-pass

Details Hydraulic height sensing system with cylinder by-pass Hydraulic height sensing system with cylinder by-pass

1979-03-05

1980-10-28

Hirsch, Paul J.

Harvesters

Motorized harvester

With condition-responsive operation

56208, 56DIG15, A01D 7514, A01D 4500

Patent

active

042299314

ABSTRACT:
An agricultural harvesting machine having a plurality of independently supported row crop harvesting units is provided with a hydraulically operated vertical positioning mechanism for adjusting the height of the units in accordance with ground surface variations. Each unit is provided with a ground-engaging feeler mechanically coupled to a control valve which adjustably varies the hydraulic fluid flow to a single acting unit lift cylinder. The cylinder includes fluid bypass capabilities to permit continued hydraulic fluid flow upon full extension of the cylinder piston and thereby avoid a fluid system pressure and consequent temperature increase.

REFERENCES:
patent: 2913878 (1959-11-01), Rue
patent: 3417553 (1968-12-01), Hubbard
patent: 3509701 (1970-05-01), Clarke
patent: 3566587 (1971-03-01), Janssen
patent: 3568420 (1971-03-01), Hofer et al.
patent: 3643407 (1972-02-01), Hubbard et al.
patent: 3714767 (1973-02-01), Hubbard et al.
patent: 3953959 (1976-05-01), Decruyenaere

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