Three-point coupling device

Details Three-point coupling device Three-point coupling device

1989-04-06

1990-07-31

Reese, Randolph A.

Earth working

With drive means for tool or cleaner

With specific relationship of mast-type hitch to implement

172272, 172439, A01B 5906

Patent

active

049443542

ABSTRACT:
The invention relates to an three-point coupling device (3) for connecting a tractor to an implement (4). Two lower hitch arms (5, 5a) have been provided with catching hooks (7, 7a). An upper hitch arm (8) has also been provided with a catching hook (11). The lower hitch arms (5, 5a) may be raised or lowered by a power drive via lifting bars (10, 10a) and lifting arms (9, 9a). The upper hitch arm (8) is suspended from a holding device (20, 20a) which is associated with the lifting bars (10, 10a). As a result, the upper hitch arm (8) may be moved jointly with the lower hitch arms (5, 5a) upon actuation of the power drive which moves the lifting arms (9, 9a) and the lifting bar (10, 10a). It is no longer necessary for the tractor driver to hold the upper hitch arm (8) himself and place it on the upper coupling point (14) of the implement (4).

REFERENCES:
patent: 3299979 (1967-01-01), Reestall
patent: 3722915 (1973-03-01), Gail
patent: 3791456 (1974-02-01), Koch
patent: 3871463 (1975-03-01), Geisthoff
patent: 3977698 (1976-08-01), von Allworden
patent: 4071105 (1978-01-01), von Allworden
patent: 4146246 (1979-03-01), Geisthoff
patent: 4149736 (1979-04-01), von Allworden
patent: 4176727 (1979-12-01), Perin

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