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US 4,585,084 AGranted
Agricultural tractor
OwnerCornelis van der Lelyinventor
Life of this patent
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OwnerCornelis van der Lelyinventor
Estimating the term…
The tractor has four front wheels and four rear wheels. The wheels are arranged so that they all run in different tracks during the tractor's straight-ahead travel. The wheels are provided with low-pressure, low-profile tires. The front wheels are drivable by the tractor's engine and steerable about king pins mounted from the change-speed gear box. They can be turned in an arc of 150.degree.. The rear wheels are undriven and rotate by ground contact. The tractor is relatively light (about 3500 kilograms or less) and the design minimizes soil compaction. The engine is mounted under the cabin at one side between the front and rear wheels with the change-speed gear box located centrally and primarily above the front wheels. The fuel tank is under the cabin disposed opposite the tractor's longitudinal centerline from the engine. Lifting devices extend to the rear between the central rear wheels and forward of the forward central wheels. Two PTO's are provided both forward and the rear. One PTO, both forward and to the rear, has an rpm proportional to the engine's speed. Another PTO both forward and to the rear has an rpm proportional to the tractor' s travel speed. The tractor's width is about three meters and it is adapted to receive a plurality of agricultural implements both fore and aft. Its cabin is mounted on an H-shaped frame disposed on the front part of the tractor placing the operator about midway between the front and rear wheels.
An agricultural tractor comprising at least one power take-off shaft, at least four front ground wheels and at least four rear ground wheels, each of said ground wheels including a low-pressure, low profile tire, each said ground wheel having a diameter of approximately 1.3 meters and providing a relatively large area in continuous contact with the ground, and an engine of at least fifty kilowatts of available power for driving at least four of said ground wheels, the tracks followed by said four wheels being substantially non-coinciding during the tractor's straight-ahead travel, the tracks followed by two of said front wheels being substantially contiguous and substantially non-overlapping with the tracks followed by two of said front wheels so that the soil structure underlying said tracks remains intact without adverse effects on subsequent plant growth.
An agricultural tractor comprising a frame, an engine carried by said frame, at least two ground driven wheels at one end of the tractor and at least two wheels drivable by said engine at the other end, and steering means which is so constructed and arranged that said latter two wheels are pivotable about a king pin through about 150.degree., the tracks of said ground wheels when the tractor is driven straight ahead being substantially contiguous and substantially not over-lapping, the weight of the tractor borne by said wheels distributed substantially uniformly over the total width of said tracks.
An agricultural tractor comprising a frame, a driving engine mounted on said frame, four forward wheels, and two king pins having respective axes of rotation which are each fixed with respect to said engine, said plurality of wheels being steerable about said king pins, and the distance between said engine and at least one of said king pins being substantially equal to the diameter of one of said wheels which is a front wheel.
An agricultural tractor comprising an engine, ground engaging wheels, means mounting a plurality of soil cultivating implements and power take-off shafts driving said soil cultivating implements, at least one of said shafts rotating at a speed proportional to said engine's rpm and at least a further said shaft rotating at a speed proportional to the tractor's forward speed, and low-pressure low-profile tires mounted on all of said wheels, at least one of said cultivating implements having rotating members driven by said further shaft, said rotating members having ground engaging parts which are rotated by said further shaft at a peripheral speed of at least about that of said wheels and in the same direction to exert tractive force on the tractor.
Dependencies are inferred from the claim text.