Land vehicles – Wheeled – Articulated vehicle
Reexamination Certificate
1999-09-09
2001-06-12
DePumpo, Daniel G. (Department: 3611)
Land vehicles
Wheeled
Articulated vehicle
C280S485000, C280S486000, C280S124111, C280S124169
Reexamination Certificate
active
06244613
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a self-propelled agricultural machine having a driven front axle and possibly also, a driveable rear axle, wherein the frames for the axles are coupled together by means of an articulated joint and the rear axle is pivotal horizontally by virtue of a thrust bearing extending along the steering axis.
A practical agricultural machine of this type is known. In this machine, the rear wheel axle is coupled in freely pivotal manner to the rear frame by means of a horizontal shaft spanning the longitudinal axis of the machine so as to adapt to rough terrain. In order to prevent the machine tipping over on such uneven terrain, especially when the steering lock is large (ca 45°),the wheel axle is additionally coupled to the rear frame by means of helical compression springs and the shock absorbers that may be associated therewith. The angle through which the wheel axle can pivot is limited by virtue of this arrangement, and adequate provision is made thereby for the necessary restoring moment. The arrangement functions satisfactorily but, against that, it is very expensive and requires a large amount of space as well as being costly and laborious to install and maintain.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome one or more of the deficiencies described above.
Another object is to produce a machine of the type described which meets the demands made thereon in a satisfactory manner especially in regard to robustness and simplicity of its implementation.
Still another object of this invention is to provide a machine having a driven front axle and a rear axle in which the frames for each are coupled together with articulated joint and the rear axle frame has two parts coupled together in such a manner that the angle of rotation is limited.
In accordance with the present invention there is provided a self-propelled agricultural machine including a front portion, a rear frame and an articulated joint connecting the front portion and the rear frame; driven front axle on the front portion; a rear axle on the rear frame; the rear frame having two upper and lower parts; and a longitudinally-extending axle-box coupling the upper and lower parts of the rear frame in such a manner that the angle of rotation is limited.
Hence the objects are achieved in that the frame for the rear axle is divided and the two parts of the frame are coupled by means of an axle-box in the form of a bearing which limits the angle of rotation. A bearing or elastic joint constructed in this manner replaces the additional compression springs and shock absorbers that were previously required in agricultural machines due to its ability to limit the angle of rotation.
The rear axle frame is divided in a constructionally simple manner with certain regions of the parts thereof being arranged one above the other and wherein at least one part of the axle frame is coupled to the axle of the axle-box by means of at least one resilient element which limits the angle of rotation.
REFERENCES:
patent: 2344072 (1944-03-01), Winkelmann
patent: 2543749 (1951-03-01), Walther
patent: 2712742 (1955-07-01), Neidhart
patent: 3366281 (1968-01-01), Wilder
patent: 3525539 (1970-08-01), Illar
patent: 3893712 (1975-07-01), Sallier
patent: 4111273 (1978-09-01), Blackburn et al.
patent: 4245714 (1981-01-01), Kersey
patent: 5356167 (1994-10-01), Hall et al.
patent: 6003888 (1999-12-01), Godbersoen
patent: 6070898 (2000-06-01), Dickie et al.
patent: PS 9 07 953 (1954-04-01), None
patent: 21 285 (1961-03-01), None
patent: AS 17 50 015 (1972-01-01), None
patent: 26 25 245 C2 (1985-08-01), None
patent: 25662 (1981-03-01), None
Claas Selbstfahrende Erntemaschinen GmbH
DePumpo Daniel G.
Husch & Eppenberger LLC
Kercher Kevin M.
Muir Robert E.
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