Dual-disk fertilizer spreader

Details Dual-disk fertilizer spreader Dual-disk fertilizer spreader

1986-08-13

1988-02-16

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Container for non-fluid material, and scattering means

Rotating scatterer

198642, 239687, 416185, A01C 1700

Patent

active

047250054

DESCRIPTION:

BRIEF SUMMARY
The invention concerns a dual-disk fertilizer spreader in accordance with the precharacterizing clause of the principal claim Dual-disk fertilizer spreaders are known per se, for example from the French Offenlegungsschrift* No. 23 82 172. Dual-disk fertilizer spreaders belong to the so-called centrifugal spreaders that currently usually display two disks that are driven with a circumferential speed of 12 to 16 m per second and carry four followers. Almost without exception, we are dealing here with flat disks that throw off the fertilizer in the horizontal plane. Although in the case of modern fertilizer spreaders it is possible to achieve, in contrast to centrifugal fertilizer spreaders driven on the ground, a constant circumferential speed for the spreader disks via the power takeoff drive, continually recurring are irregularities in the scatter pattern over the entire scatter width, in particular when differnet types of fertilizers are used. This leads to overspreadings or bald spots that cause irregular plant start. (specification) examined only as to obvious defects but not as to patentability
For the purpose of smoothing the scatter pattern and the throw width, known from the German Offenlegungsschrift No. 29 08 949 is how to construct the floor surface of the spreader disks, i.e. concavely, and how to use followers that are embodied in a certain manner.
A species-forming fertilizer spreader is described in the German Offenlegungsschrift No. 29 13 738.
In general, in the case of dual-disk centrifugal fertilizer spreaders, the problem consists of achieving an optimal overlapping of the scatter pattern, both toward the outside and in the middle (behind the tractor). The scatter pattern becomes more uniform if one travels with greater overlapping, i.e. with a higher circumferential speed. Then, however, posing a disadvantage is too strong overlapping in the center, behind the tractor. Then, it is no longer possible to spread half-sidedly with the spreader without additional parts, because one centrifugal disk spreads too far into the other half. By reducing the circumferential speed, the flanks of the scatter pattern become very steep outwardly and underfertilizing results in the center next to the tractor.
The task underlying the invention is to obtain a centrifugal fertilizer, i.e. a dual-disk fertilizer spreader with which it is possible to achieve a uniform scatter pattern over the entire scatter width and, actually, to do this also in the case of different types of fertilizers, i.e. therefore different grain weights and different grain sizes.
Compared to the known arrangement, the invention proposes that the deflecting means be constructed such that they separate (divide) the stream of fertilizer, completely or partially, into flight paths that lie in the plane of the disks, i.e. no rising of the flight paths is effected, but the flight paths of the deflected streams of granulate lie in the plane of the disks and are directed differently only within this plane.
This arrangement differs basically from the method of operation proposed in the German Offenlegungsschrift No. 29 13 738 and, in surprising fashion, achieves the effect that, for one thing, there results a smoothing of the outer areas of the scatter width in the direction of a flattening of the distribution curve and, for another thing, when spreading different types of fertilizers in the overlapping zones of the two spreader disks, i.e. in the area of the center of the path of travel, overlapping can be maintained small whereby one-sided spreading at the boundaries of the field is possible without expensive auxiliary arrangements.
Achieved in astonishing fashion by the arrangement in accordance with the invention is that the special embodiment of the followers enables a uniform scatter pattern over the entire scatter width, i.e. no overfertilizing and no bald spots, whereby with the device constructed in accordance with the invention, it is also possible to discharge different types of fertilizers and it is possible to achieve the same unif

REFERENCES:
patent: 1655780 (1928-01-01), Bruninger et al.
patent: 2085171 (1937-06-01), Sheard
patent: 3966124 (1976-06-01), Sukup
patent: 4300725 (1981-11-01), Noherek

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