Patent ID: 6604589
Filing Date: 2003-08-12
Classification: B60G,B62D

Abstract:
A drive for a vehicle intended to traverse rough terrain, wherein the vehicle has a drive shaft, said drive comprising:a) a first drive unit; b) a second drive unit; c) a first pair of tires; d) a second pair of tires; and e) a secondary drive shaft; wherein said first drive unit is for operatively connecting to the drive shaft of the vehicle; wherein said second drive unit is operatively connected to said first drive unit; wherein said first pair of tires are operatively connected to said first drive unit; wherein said first pair of tires are shaped for traversing the rough terrain; wherein said second pair of tires are operatively connected to said second drive unit; wherein said second pair of tires are shaped for traverse the rough terrain; wherein each tire of said first pair of tires and said second pair of tires are identical to each other; wherein each tire of said first pair of tires and said second pair of tires has a rotational center; wherein each tire of said first pair of tires and said second pair of tires has a periphery; wherein said periphery of each tire of said first pair of tires and said second pair of tires is divided into a first segment and a second segment; wherein said first segment of said periphery of each tire of said first pair of tires and said second pair of tires is a first arc of a circle; wherein said first arc of a circle of said first segment of said periphery of each tire of said first pair of tires and said second pair of tires has a first radius of curvature; wherein said first arc of a circle of said first segment of said periphery of each tire of said first pair of tires and said second pair of tires has a first center; wherein said first radius of curvature extends from said first center of said first arc of a circle of said first segment of said periphery of each tire of said first pair of tires and said second pair of tires; wherein said first center of said first arc of a circle of said first segment of said periphery of each tire of said first pair of tires and said second pair of tires is said rotational center of an associated tire of each tire of said first pair of tires and said second pair of tires so as to allow said first arc of a circle of said first segment of said periphery of each tire of said first pair of tires and said second pair of tires to roll when in contact with the rough terrain; wherein said first arc of a circle of said first segment of said periphery of each tire of said first pair of tires and said second pair of tires extends 240Â° from an originating point thereof to a terminating point thereof; wherein said second segment of said periphery of each tire of said first pair of tires and said second pair of tires is a second arc of a circle; wherein said second arc of a circle of said second segment of said periphery of each tire of said first pair of tires and said second pair of tires extends 120Â° from said originating point of said first arc of a circle of said first segment of an associated tire of each tire of said first pair of tires and said second pair of tires to said terminating point of said first arc of a circle of said first segment of said associated tire of each tire of said first pair of tires and said second pair of tires so as to close said first arc of a circle of said first segment of said associated tire of each tire of said first pair of tires and said second pair of tires; wherein said second arc of a circle of said second segment of said periphery of each tire of said first pair of tires and said second pair of tires has a second center; and wherein said second center of said second arc of a circle of said second segment of said periphery of each tire of said first pair of tires and said second pair of tires is not said rotational center of an associated tire of each tire of said first pair of tires and said second pair of tires.