Earth working – Rolling – rotating or orbitally moving tool – Plural disks with individual mount or axis
Patent
1992-06-15
1993-11-09
Reese, Randolph A.
Earth working
Rolling, rotating or orbitally moving tool
Plural disks with individual mount or axis
172603, 172569, 172574, A01B 500, A01B 2306
Patent
active
052594602
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for working the ground comprising a frame with a plurality of standing shafts mounted pivotally thereon, each of which is provided on a free end with a lying shaft whereon a disc-shaped body is rotatably mounted, wherein each disc-shaped body has a concave and a convex side. Such a device is known from the U.S. Pat. No. 3,675,725.
Such a device (normally known as a disc harrow) is used in agriculture for further working of ploughed earth, for ploughing under seed and manure and/or for weed control. It is of great importance in these workings to keep the working depth, i.e. the depth to which the discs work the ground, substantially unchanged. A disc harrow is generally fixed for this purpose to a so-called three-point lifting device that forms part of a tractor and with which the position of the harrow relative to the tractor, and therewith the working depth is controlled.
SUMMARY OF THE INVENTION
The device according to the present invention differs from conventional disc harrows wherein the discs are jointly fixed to one continuous shaft in that each disc is arranged on the end of a separate, pivotable standing shaft. This has the great advantage that the angle between the rotating shaft of the discs and the direction of movement of the tractor (the setting angle) can be varied without a continuous shaft having to be swivelled for this purpose through the desired setting angle. Thus prevented is that the discs on one of the outer ends of the harrow are moved far behind the tractor and that their working depth can no longer be properly controlled by the lifting device. In the device according to the present invention the setting angle of the discs can be varied without the distance between the discs and the tractor changing, whereby, using the lifting device, a virtually constant working depth can be simply maintained.
The disc harrow known from U.S. Pat. No. 3,675,725 has the great drawback, however, that the standing pivot shafts ar placed on the convex side of the discs connected thereto. This results in the danger of earth thrown up by an adjacent disc collecting and clogging between the standing pivot shaft and the disc, whereby the discs can jam.
The present invention therefore has for its object to provide a ground working device of the above described type wherein the above stated drawback does not occur. This is achieved according to the invention in that each standing pivot shaft is placed on the concave side of its associated disc-shaped body. Thus obtained is a reliable and robust disc harrow with separately pivotable discs which is suitable for use in a large number of ground types.
In preference the convex side is substantially smooth. This prevents earth possibly clogging on the convex side whereby bearings that may run through the disc-shaped bodies to the convex side could become jammed.
A very good working of the ground is obtained when during working each rotating shaft runs in inclined position relative to the ground. Each disc thereby as it were "digs" the ground whereby this is well loosened.
The disc is shaped in order to prevent earth that may be carried onto the concave side of a disc being able to collect between the disc and its pivot shaft, whereby the disc could become jammed.
The soil working device can be further provided with means arranged at the rear of the frame for attaching a height-adjustable cultivator. Because the cultivator tends to dig itself into the ground the working depth of the discs is kept constant to an event greater extent.
BRIEF DESCRIPTION OF THE DRAWINGS
Mentioned and other features of the device according to the present invention will be elucidated on the basis of an embodiment, wherein reference is made to the annexed drawing in which corresponding reference numerals designate corresponding components, and wherein:
FIG. 1 shows a perspective view of a first embodiment of the device according to the invention;
FIG. 2 is a partially sectional view of a detail of the setting me
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Evers Research B.V.
Reese Randolph A.
Warwick Spencer
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