Patent ID: 7597161
Filing Date: 2009-10-06
Classification: B62D

Abstract:
1. An endless track assembly comprising: a) a frame including a sprocket; b) first and second and third and fourth suspension arms mounted to pivot from said frame and each supporting an axle; c) a plurality of idler wheels, wherein first and second idler wheels are mounted to the axles of said first and second suspension arms and third and fourth idler wheels are mounted to the axles of said third and fourth suspension arms, wherein a first linkage arm is coupled between said first and second suspension arms and a second linkage arm is coupled between said third and fourth suspension arms, and wherein first and second resilient members bias movement of said first and second linkage arms, such that a pivotal movement of any of said first and second and third and fourth suspension arms is resiliently opposed or assisted by said first and second resilient members as the other of said first and second and third and fourth suspension arms attempts to follow; d) a support member coupled to said frame via a third resilient member and coupled to said second and third suspension arms via third and fourth linkage arms; and e) an endless track trained around said drive sprocket and said plurality of idler wheels, whereby undulations in the terrain are followed by pivotal rotation of said first, second, third and fourth suspension arms to vary a longitudinal profile of said track to complement the undulations.