Earth working – Rolling – rotating or orbitally moving tool – Disks pivoted on vertical axes with interconnected means for...
Patent
1993-05-25
1995-10-17
Reese, Randolph A.
Earth working
Rolling, rotating or orbitally moving tool
Disks pivoted on vertical axes with interconnected means for...
172739, 172603, 172574, A01B 500
Patent
active
054582032
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, moveable setting means connected with the shafts for collectively pivoting the shafts, each standing shaft being 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, and adjacent disc-shaped bodies are arranged in parallel relationship. 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.
The device according to U.S. Pat. No. 3,675,725 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 U.S. Pat. No. 3,675,725 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 the U.S. Pat. No. 3,675,725 has the great drawback, however, that the standing pivot shafts are 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.
It should be noted that from the U.S. Pat. No. 2,768,864, a disc harrow is known having a plurality of discs arranged in parallel on a transverse bar, each disc having an associated shank extending downwardly and rearwardly from the transverse bar and being placed on the concave side of the disc. This patent, however, relates to disc harrows having their discs quite close together, whereas the disc harrow of the present invention has its discs relatively far apart, to accommodate their pivotal movement.
SUMMARY OF THE INVENTION
The present invention 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 pivotable standing 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 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 lying shaft runs in inclined position relative to the ground. Each disc thereby as it were "digs" the ground whereby this is well loosened.
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 distance between each pivot shaft and its associated disc-shaped body increases in the direct
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Evers Research B.V.
Reese Randolph A.
Warnick Spencer
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