Patent ID: 7219452

Claim:
In combination, a land vehicle and at least two trench wheels; said land vehicle having at least two wheel hubs for supporting said at least two trench wheels in axial alignment along an axis of forward travel, a first one and a second one of said at least two wheel hubs displaced from alignment with each other and aligned about an axis nonparallel to said axis of forward travel, said first one of said at least two wheel hubs supporting a first one of said at least two trench wheels and said second one of said at least two wheel hubs supporting a second one of said at least two trench wheels; said at least two trench wheels having identical construction to the other, each having a wheel axis of rotation, first and second side walls separated from each other by a distance which generally decreases with increasing radial distance from said wheel axis of rotation, and each also having a mounting offset from said axis of forward travel which has a first mounting face and a second mounting face opposed to said first mounting face; said first one of said at least two trench wheels mounted to said first one of said at least two wheel hubs with said first mounting face adjacent said first one of said at least two wheel hubs, said second one of said at least two trench wheels mounted to said second one of said at least two wheel hubs with said second mounting face adjacent said second one of said at least two wheel hubs.