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Agricultural tractors and other vehicles

  • US 4,311,203 A
  • Filed: 01/19/1979
  • Issued: 01/19/1982
  • Est. Priority Date: 06/25/1974
  • Status: Expired due to Term
First Claim
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1. An agricultural tractor which comprises:

  • a frame comprising forward and aft frame portions which are turnable relative to each other about a fore and aft axis;

    power producing means supported by said frame;

    at least three pairs of ground wheels of substantially the same diameter mounted on said frame whereby a forward pair of said wheels is located forwardly thereon, a rear pair of said wheels is located rearwardly thereon and a further pair of said wheels is located between said forward and said rear pairs of wheels, control means for the tractor'"'"'s operator whereby each of said further pair of wheels is selectively and independently displaceable upwardly above ground level and downwardly at least to ground level relative to the other wheels, a lifting device for implements or the like mounted at the rear of said aft frame portion, said rear wheels including pneumatic tires and being mounted on said aft frame portion and said forward wheels also including pneumatic tires and being mounted on said forward frame portion, each said pair of wheels including separate means for rotating same;

    means for separately controlling the rotation of each said wheel;

    separate power transmission means connecting each said rotating means with said power producing means whereby each said pair of wheels is energized substantially independently of the other said pairs of wheels;

    steering means connected to the forward of said pairs of wheels whereby said forward wheels are steerable with respect to said rear pair of wheels;

    said wheels located between said forward and said rear pairs of wheels having a tread width greater than the tread width of said forward and rear wheels and having a dentated form as seen from the side.

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