Load equalizing, dual wheels for grain cart

Apparatus for mounting a pair of side wheels on a grain cart, wherein the pair of side wheels includes an outer wheel with a first tire and an inner wheel with a second tire in contact with the soil, said apparatus comprising:

• a longitudinal frame member disposed on a lateral portion of the grain cart;
• first and second support members disposed on opposed sides of said frame member and rotationally coupled to an outer and an inner wheel, respectively;
• first lower link means pivotally coupled to said longitudinal frame members as well as to said first and second support members for vertically displacing said wheels in opposite directions as the cart traverses an uneven soil surface and the relative height of said wheels changes;
• and
• second upper link means shorter in length than said first lower link means and pivotally coupled to said longitudinal frame member as well as to said first and second support members for maintaining lateral spacing between contact points of said outer and inner wheels with the soil essentially unchanged as the relative height of said inner and outer wheels changes.

A dual wheel arrangement including inner and outer wheels each with a respective tire mounted thereto for supporting a grain cart having a side frame member, said arrangement comprising:

• first and second support members rotationally coupled to said inner and outer wheels, respectively, and disposed in facing relation on opposed sides of the cart's side frame member;
• first lower linkage means for pivotally coupling said first and second support members to the side frame member wherein upward or downward generally vertical displacement of said first support member causes a complementary downward or upward displacement of said second support member as the tires traverse an uneven surface and the relative height of said inner and outer wheels changes;
• and
• second upper linkage means for pivotally coupling said first and second support members to the side frame member and for changing tire camber from positive camber when the tires are in contact with a level surface to negative camber when the tires are in contact with an uneven surface and are at different heights to maintain lateral spacing between contact points of the tires with the surface essentially constant over a range of tire height differences and eliminate tire scrubbing, or spillage, as the grain cart traverses an uneven surface.