초록 ▼

First and second pairs of wheels are mounted to respective sides of a grain cart in a manner which avoids tire “scrubbing,”such as when a tire is forced sideways over a support surface without rotation, as the cart is displaced in a turning manner over uneven soil. Each pair of wheels includes an in

First and second pairs of wheels are mounted to respective sides of a grain cart in a manner which avoids tire “scrubbing,”such as when a tire is forced sideways over a support surface without rotation, as the cart is displaced in a turning manner over uneven soil. Each pair of wheels includes an inner and an outer wheel coupled together by pivoting linkage which allows each wheel to move either upward or downward over uneven soil while vertically displacing the other wheel in the opposite direction. On level ground, the linkage provides a positive camber for a pair of inner and outer wheels, with lower portions of adjacent wheels in contact with the soil more closely spaced than upper portions of the wheels. As the relative elevation of the wheels changes as the cart traverses uneven soil, wheel camber changes from positive to negative, wherein upper portions of adjacent wheels are more closely spaced than lower portions of the wheels. This inward tilting of adjacent inner and outer wheels with differences in individual wheel elevation maintains lateral spacing between the contact points of adjacent wheels with the soil essentially constant over the full range of wheel elevation differences and prevents tire scrubbing as the cart traverses uneven soil.

대표청구항 ▼

An agricultural cart for hauling material by means of a tractor, said grain cart comprising: a frame including a tongue; hitch means for securing said tongue to said tractor; a hopper mounted to said frame; and first and second dual wheel assemblies mounted respectively to the left and right sides o

An agricultural cart for hauling material by means of a tractor, said grain cart comprising: a frame including a tongue; hitch means for securing said tongue to said tractor; a hopper mounted to said frame; and first and second dual wheel assemblies mounted respectively to the left and right sides of said frame for supporting said frame and said hopper, each assembly including first and second wheels and first and second wheel supports for supporting said first and second wheels, respectively, and characterized in that all four wheels are aligned along a common axis of rotation when said wheels are on level ground, each dual wheel assembly further comprising pivot link means pivotally mounted at an intermediate location to said frame for vertical pivotal motion, the outboard ends of said pivot link means being pivotally connected to said first and second wheel supports, respectively, whereby as one of the wheels of an assembly is moved vertically, the complementary wheel moves in the opposite vertical direction to accommodate variation in ground contour, and camber link means interconnecting said first and second wheel supports such that the ground contact points of said first and second wheels maintain a substantially constant lateral displacement as said wheels adjust vertically to variations in ground contour.