Hitch device for attaching farm implements to a tractor

Details Hitch device for attaching farm implements to a tractor Hitch device for attaching farm implements to a tractor

2005-07-26

2005-07-26

Novosad, Christopher J. (Department: 3671)

Earth working

Mast type hitch

Reexamination Certificate

active

06920940

ABSTRACT:
A farm implement of a tractor is hitched to two lift arms, each of which is moved by a respective actuating cylinder having two chambers connected to a feed circuit supplying a pressurized fluid; the feed circuit having, for each chamber, two feed lines for feeding the fluid to and from the chamber respectively, and four independent valves, each located along one of the feed lines and movable between a closed position and at least one open position respectively closing and opening the relative feed line.

REFERENCES:
patent: 3684056 (1972-08-01), Penso
patent: 3731745 (1973-05-01), Koch
patent: 3795415 (1974-03-01), Koch et al.
patent: 4702489 (1987-10-01), Erickson
patent: 5401086 (1995-03-01), Nishikimi et al.
patent: 5634779 (1997-06-01), Eysymontt
patent: 5880957 (1999-03-01), Aardema et al.
patent: 6218737 (2001-04-01), Adamek et al.
patent: 2001/0007399 (2001-07-01), Jung et al.
patent: 1 403 102 (2004-03-01), None

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