Planting – Broadcasting – Main and auxiliary frame machines
Reexamination Certificate
1998-06-24
2001-05-15
Batson, Victor (Department: 3671)
Planting
Broadcasting
Main and auxiliary frame machines
C111S063000, C111S174000, C172S518000, C172S445100, C172S449000, C172S810000
Reexamination Certificate
active
06230636
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an agricultural machine, in particular a soil cultivating machine, such as a seed drill whether or not combined with a cultivator, which is provided with a supporting implement for coupling to the front lifting hitch of a tractor, the implement, for the purpose of being supported on the ground being provided with a roller that is connected with a frame.
BACKGROUND OF THE INVENTION
Such machines are generally known, They are intended for further crumbling soil which has been previously worked, usually by plowing, at least in the upper part of the worked soil layer. As primary cultivation has particularly for its object to turn the upper soil layer, the latter is usually broken up roughly and contact with the soil layer which has not been touched is considerably reduced. Known machines are intended to press the primarily cultivated soil, prior to crumbling, in such a manner that the contact between soil which has been turned and soil which has not been touched is established at least to some extent. This contact is required for the growth of plants in view of the capillary supply of water from relatively deep soil layers. During pressing, considerable forces may occur in the frame of the machine or in the connection thereof with the tractor. This often leads to a relatively heavy construction of the frame. The present invention has for its object to provide a construction in which such forces are avoided or act on the frame construction to a lesser degree.
SUMMARY OP THE INVENTION
In accordance with the invention, the above objective is achieved when suitable supporting means and are provided between the frame and the roller for a mutual pivoting movement about an imaginary or real axis which is orientated in the direction of travel. With such a construction it is usually possible for the roller to follow unevenness in the field without torsion forces occurring between the tractor and the frame or in the frame itself. The construction also facilitates the movement of the tractor during operation. Moreover, by avoiding to a significant extent torsion forces occurring in the implement, a relatively lighter and consequently cheaper construction of the frame is possible.
In a favorable embodiment, the supporting means comprise a real pivotal axis, at the ends of which roller bearings are provided, which roller bearings are included in the frame with little clearance between an upper and a lower horizontal guide face. In an alternative embodiment, the frame is supported on the roller via at least two spring elements, such as compression springs or shock absorbers, whether or not hydraulic ones, each disposed on a lateral side outside the transverse center of the roller.
According to a further aspect of the invention, the pushing forces of the tractor are transferred to the roller via the frame of the implement by means of arms arranged between the frame and the roller construction, which arms, at connecting points, are provided with ball-and-socket joints. In accordance with the invention, in view of the forward movement of the roller, the arms may be included in the machine both in a pushing and in a pulling position.
A further particular aspect of the invention relates to an implement in which such arms extend for the greater part above the roller, substantially horizontally, and from the frame towards the roller while having a downward directional component. Such a machine is compact in height in the direction of travel, so that maneuvering the machine is facilitated and the center of gravity is located close to the tractor.
The present invention is particularly advantageous when the agricultural machine is constituted by a combination of a cultivator and a sowing or broadcasting machine having a hopper which is supported on the frame of the implement. With such an agricultural machine, by means of the construction according to the present invention, an advantage is obtained that in case of a local unevenness or a local slope in the soil surface, the frame and hopper are able to maintain their position relative to the lifting hitch of the tractor. In particular, when the hopper is completely filled, this has the advantage that no additional forces as a result of tilting of the hopper will occur in the construction.
The invention furthermore comprises a construction in which a centrifugal air pump is arranged in the immediate vicinity of the trestle of the implement, the drive shaft thereof being orientated in the direction of travel and the shaft of the centrifugal air pump, via transmission means, being in driving connection with a drive shaft which is located in the transverse center of the implement. Such a construction is very compact and advantageous because of the possibility of a relatively short and simple transmission via a universal joint shaft which is connected to the front power take-off shaft of a tractor.
The invention further comprises an agricultural machine including a metering device, the discharge opening of which is released by means of a sliding device, e.g. for testing purposes.
REFERENCES:
patent: 3810434 (1974-05-01), Van Der Lely et al.
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patent: 4058068 (1977-11-01), Van Der Lely et al.
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patent: 4193710 (1980-03-01), Pietrowski
patent: 4302129 (1981-11-01), Arenz
patent: 4533000 (1985-08-01), Van Der Lely
patent: 5494375 (1996-02-01), Yates
Bom Cornelis Johannes Gerardus
Brabander Adrianus Petrus Maria
Batson Victor
Maasland N.V.
Penrose Lucas Albright
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