Earth working – Rolling – rotating or orbitally moving tool – With spring means other than for detent
Patent
1989-04-19
1990-03-06
Reese, Randolph A.
Earth working
Rolling, rotating or orbitally moving tool
With spring means other than for detent
172537, 267292, 280716, A01B 2900
Patent
active
049057715
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an agricultural roller comprising at least two sections with a frame member mounting a set of rotatable rollers composed of a shaft carrying a plurality of roller rings and suspension units one being provided at either end of each roller set in order that the ends of the set be permitted a large but limited movement in a direction A perpendicular to the ground working or travelling direction, the suspension units being independent from one another so as to adapt each roller set to ground irregularities, whereas the movement of the roller set ends in directions perpendicular to the said direction A is restricted. Such an agricultural roller is known from DE-C-28 11 906.
Known suspension units comprise a plurality of parts, which often have a complicated shape or are expensive to manufacture. Such drawbacks are avoided by the invention, which provides an elastic unit in a very simple and cheap manner, and is achieved by the distinguishing features disclosed in the accompanying claims.
The invention will now be described in more detail and with reference to the accompanying drawing, where FIG. 1 illustrates the unit from one side and FIG. 2 is a perspective view seen from one side.
In the Figures the numeral 1 denotes a roller, 2 the frame of the roller and 3 an attachment on an outer housing 4. The numeral 5 denotes an inner mounting carrying the outer end of the shaft (10) of the roller set. The numeral 6 denotes two elastic rubber abutments connecting the housing 4 to the inner mounting 5 such that the inner mounting can move inside the outer housing 4 when the roller is in operation. Openings 7 and 8 are made respectively on the upper sides and under sides of the abutments 6. In this way the stiffness of the unit will be less vertically than horizontally.
The roller set can then adapt to ground irregularities without any great movement taking place in the travelling direction.
It has been found that the best result is obtained if the abutments are given an axial extension attaining to 40 to 50% of the diameter of the outer housing.
To mitigate shock forces occurring when rolling over stones or other hard irregularities in the ground, a ridge can be formed at the upper side of the inner mounting 5, this ridge coming into contact with the inner surface of the outer housing 4 after a given movement of the inner mounting 5. This ridge can to advantage be made cuneiform to obtain progressive force.
By placing the inner mounting 5 eccentrically and below the centre of the outer housing 4, the elastic material may be allowed to form a thicker layer between the inner mounting 5 and the ridge 9. There is thus obtained a larger elastic volume between the inner mounting and the ridge so that larger shock energy can be taken up in the movement of the inner mounting 5 towards the housing 4.
Where there are rollers having several sections, where outer sections are folded upwards during transport to reduce the transport width, it is advantageous for the abutments 6 to extend along the entire length of the roller set, since in the folded up position of the sections the entire weight of the roller set, which can attain to several hundred kilograms, is then carried solely by the elastic portions 6 of the suspension unit.
One skilled in the art is capable of implementing a suspension unit in accordance with the invention in several ways within the scope of the claims, depending on the function desired. For example, the opening 7 may be given a V-shape with the apex directed downwards. In such a case there is obtained more elastic material for absorbing shocks and in this connection the ridge 9 can be dispensed with. Other modifications are also possible, the abutments may have shape of two or more pairs having openings in between the pairs.
1. An agricultural roller comprising a frame member (2) mounting a rotatable roller comprised of a shaft (10) carrying at least one roller ring and suspension unit, the suspension unit being constructed so that the ends of the shaft are permitted a large
REFERENCES:
patent: 1190257 (1916-07-01), Henderson
patent: 2796712 (1957-06-01), Miller et al.
patent: 4223742 (1980-09-01), Stark
patent: 4471935 (1984-09-01), Chiba et al.
patent: 4700934 (1987-10-01), Andra et al.
Reese Randolph A.
Thompson Jeffrey L.
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