GB2083332A

GB2083332A - Seed depositing share

Info

Publication number: GB2083332A
Application number: GB8126087A
Authority: GB
Original assignee: Weiste & Co Accord Landmasch; Accord Landmaschinen Heinrich Weiste and Co GmbH
Current assignee: Weiste & Co Accord Landmasch; Accord Landmaschinen Heinrich Weiste and Co GmbH
Priority date: 1980-09-12
Filing date: 1981-08-26
Publication date: 1982-03-24
Also published as: DE3034410C1; GB2083332B; FR2490064A1; FR2490064B1

Abstract

A share designed to spread seed sideways as it deposits it in the ground has a generally flat top plate 2 and a generally flat bottom plate 5 onto which seed falls from conduit 1. The side edges 3, 4 of the top plate 2 may be folded downwards and the side edges 6, 7 of the bottom plate 5 may be folded upwards, so that the seed does not become jammed in between the two plates or between the top plate and the earth at the sides of the seed distributing space. <IMAGE>

Description

SPECIFICATION Seed depositing share The invention relates to a seed share of the type which is intended to distribute seed in a band rather than in a line. Shares of this type may have a feed tube for the seeds, which opens out under a guideplate defining a downwardly open space and an impact plate, which seen in the direction of travel-nor- mally ends at a distance before the end of the guideplate and is located underneath the aperture of the feed tube.

Seed shares of this type are known. The guideplate is normally triangular as seen from above. The guideplate usually forms the back (i.e. top) of the share.

In known seed shares of this type, the earth is moved sideways as it slides over the back of the share. This sideward movement depends on the cutting width, and the greater the angle of inclination of the back and the cutting width, the more earth is conveyed to the side, resulting in furrows. These furrows prevent the seed in the ground from being covered evenly with earth and, moreover, they adversely affect the uniform depth guidance of the share, so that it becomes necessary, in the known shares, to restrict the share width in view of these detrimental phenomena.

Furthermore, with known shares, having share backs inclined to the side and forwards, seeds sometimes become jammed between the impact plate and the underside of the share back (guideplate) or else between the ground and the share back. As a result, the seeds are not properly distributed over the full width covered by the share.

The present invention seeks to achieve as uniform a distribution of the seeds as possible over the width covered by the seed share, while ensuring that the seeds are deposited at a uniform depth and that they are covered evenly over the width of the seed share.

According to the invention, the guideplate is substantially planar, preferably with marginal regions folded downwards.

In such shares the seeds tend to slide freely between the impact plate and the underside of the share back, particularly if the share is adapted to the particular seed to be cast, by ensuring that the edge height somewhat exceeds the maximum size of the individual grains so that the grains can slide and move freely even in the marginal region. Different heights of the marginal edges can be adopted for different seeds by an appropriate choice of the share so that if very small seed grains are to be used the share can have an appropriately thin construction.

The plane design of the guideplate ensures that the seed broadcasting share moves through the ground in a flat and streamlined manner, so that it almost floats through the loose crumb layer of a seed bed and the upper and lower earth layers are separated from one another (by e.g.) only 6-12 mm to create a space in which the seeds can be deposited. The cover of earth closes up behind the share almost unchanged and there is no substantial displacement of earth to the side.

The downward folding of the marginal regions of the guideplate increases the resistance to movement through the ground. However, this is largely compensated for by the fact that, in contrast to the known shares, the share back is not set obliquely in the direction of travel, but is made plane, so that the resistance due to that is reduced.

The design of the impact plate can allow the feed tube on the share body to be set relatively far to the rear and the impact plate tends to prevent turbulence, which can lead to a heavier covering of the ground with seed, from arising in the front region of the share body. By means of the present invention, the region of ground covered by the share may be large while maintaining a substantially uniform deposition of the seeds.

If a bow-like shaped piece is located at the tip of the share and forms a connection between the feed tube and the guideplate, this has the advantage that the seed share drives deeply in a well prepared seed bed, even without supporting wheels, since as the depth of penetration increases this bow-like shaped piece provides a larger cross-sectional area, so that an equilibrium is established between the share load and the penetration resistance. In this way, very good depth guidance on prepared ground is made possible.

An exemplary embodiment of the invention is explained below with reference to the accompanying drawings in which: Figure 1 shows a share embodying the invention from the side in cross-section; Figure 2 shows a cross-section plan view: and Figure 3 shows a cross-section rear view.

In the drawings, 1 denotes the seed feed tube which carries a guideplate 2 at its lower end. This guideplate 2 tapers towards the front in the form of a wing and has a folded marginal region on each side, this folded marginal region bearing the reference numerals 3 and 4. A cavity is provided in this way.

Located in this cavity is an impact plate 5 which is fixed to the lower side of the guideplate 2 by means of raised marginal edges 6 and 7 and thereby defines a space open only to the rear. As is clearly evident at 8, the rear edge of the impact plate 5 ends at a distance from the rearward edge of the guideplate, so that the seed is properly deposited.

The marginal edges 6 and 7 form an angle ss which is different from the angle a between the folded marginal regions 3, 4 of the guideplate 2 that is to say, the angle ss is preferably greater than the angle a. This ensures good guidance of the seed share through the ground, and, on the other hand, the necessary broad space for depositing the grain is provided, but dead regions in which seed grains can collect are, at the same time, avoided.

The seed is supplied pneumatically.

A bow-like shaped piece 9 is provided in front of the feed tube 1, extending down to the lower edge of the folded marginal region.

Such pieces are known in share technology and can be designed as castings. The function of this shaped piece is to provide a streamlined transition between the feed tube 1 and the guideplate 2, and at the same time to regulate the depth of penetration of the share in the ground.

As may be seen from Fig. 1, the impact plate 5 is inclined slightly downwards and backwards, resulting in a certain compacting of the earth by the underside.

In conclusion, therefore, it may be noted that by means of the seed share according to the invention a uniform covering of the ground behind the seed is achieved as a result of the special shaping of the seed share. The angle between the straight line pointing in the direction of travel and the inclination of the folded marginal region can be, for example, 30 . This angle as 3 in Fig. 2.

Claims

1. A seed share for depositing seed in the ground having a feed conduit for seed which opens beneath a first plate and over a second plate so that seed passing down the conduit will impact on the second plate on leaving the conduit and will pass between the two plates and out of the rear of the share as it travels through the ground, the major part of the first plate being substantially planar.

2. A share according to claim 1 in which the side edge portions of the first plate are turned downwards beyond the second plate.

3. A share according to claim 1 or claim 2 in which the rear end of the second plate is further than the rear end of the first plate.

4. A share according to any one of the preceding claims in which the second plate has an upturned edge portion or portions which abuts the undersurface of its first plate.

5. A share according to any of the preceding claims in which the sides of the plates diverge to the rear of the share, the included angle between the sides of the first plate being less than the included angle between the sides of the second plate.

6. A share according to claim 5 in which both plates are substantially triangular.

7. A share according to any one of the preceding claims in which the second plate is angled downwardly and backwardly.

8. A share according to any one of the preceding claims in which a bow shaped member extends in front of the feed conduit down to the bottom of the share.

9. A seed share for depositing seed in the ground substantially as herein described with reference to and as illustrated in the accompa nying drawings.