Suspension for a mowing unit

Harvesters – Motorized harvester – Including motorized vehicle causing transit of harvester

Reexamination Certificate

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Details

C056S014900, C056S208000

Reexamination Certificate

active

06250055

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention pertains to a suspension attaching a mower-conditioner header or platform on a mobile frame by means of at least one lower link and one upper link, each of which is vertically pivoting.
U.S. Pat. No. 3,780,506, granted to Tashiro on Dec. 25, 1973, discloses a mower-conditioner having a cutter bar incorporated in a header or platform which is suspended on a frame, in a vertically pivoting manner, by means of one lower link and two upper links. The upper links are each moved up and down by means of a hydraulic cylinder and are each biased upward by means of a spring. If, during operation, the cutter bar slides along the ground and hits an obstacle, it raises and tilts forward, since the hydraulic cylinders are then not pressurized so that the header is free to float.
A mower-conditioner disclosed in U.S. Pat. No. 4,182,099, granted to Davis et al. on Jan. 08, 1980, has a cutter bar incorporated in a header which is mounted to a mobile frame by means of pairs of nearly parallel upper and lower links. Upon hitting an obstacle, the cutter bar may yield upward only under certain conditions and, otherwise, fully receives the impact.
The underlying problem of the invention is found in the fact that the known suspensions are hardly suitable to protect the cutter bar from sharp impact when hitting an obstacle.
SUMMARY OF THE INVENTION
According to the present invention there is provided an improved suspension for crop harvester headers, and, more specifically there is provided suspensions for minimizing the forces imparted to the cutter bar of such headers when hitting an obstacle.
An object of the invention is to provide a suspension for a crop harvesting header which allows the header to pivot upward about a front pivot axis established by a lower suspension link when the cutter bar hits an obstacle on the ground during cutting operation.
A more specific object of the invention is to provide a suspension, as defined in the immediately preceding object, wherein an upper suspension link incorporates a spring which resists the upward pivotal movement of the header.
Yet another object of the invention is to provide an upper suspension link, as set forth in the immediately preceding object, which may be adjusted in length without disturbing the spring.
These and other objects of the invention will become apparent from a reading of the ensuing description together with the appended drawing.


REFERENCES:
patent: 2701940 (1955-02-01), Carr
patent: 2816410 (1957-12-01), Nobles
patent: 3474601 (1969-10-01), Burrough et al.
patent: 3589115 (1971-06-01), Taylor et al.
patent: 3780506 (1973-12-01), Tashiro
patent: 4177625 (1979-12-01), Knight et al.
patent: 4182099 (1980-01-01), Davis et al.
patent: 4187664 (1980-02-01), Meek et al.
patent: 4206582 (1980-06-01), Molzahn et al.
patent: 4286423 (1981-09-01), Caldwell et al.
patent: 4724661 (1988-02-01), Blakeslee et al.
patent: 5427184 (1995-06-01), Peck
patent: 5566535 (1996-10-01), Pruitt
patent: 6116007 (2000-09-01), Eggena et al.
patent: OS 1923 454 (1970-11-01), None
patent: 26 07 364 B2 (1977-09-01), None
patent: 31 06929 C2 (1985-12-01), None
patent: 000429381 (1991-05-01), None
patent: 0 634 092 A1 (1995-01-01), None

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