Patent ID: 7547078
Filing Date: 2009-06-16
Classification: A61G,B62D,B62K,B62M

Abstract:
1. A traction system for a vehicle, comprising: a support frame defining a substantially circular track belt support that is revolvable about an axis at the center of the support frame, said axis being in a fixed position with respect to a chassis of the vehicle; a flexible track belt; and a track belt stretching assembly comprising one or more track belt stretching rollers; said system having one traction configuration in which the flexible traction belt is held on said support track forming a substantially circular, wheel-like traction surface, said belt stretching assembly can change to a belt stretching state in which said rollers engage said belt and stretch said belt out from said belt's relatively relaxed state in said one traction configuration, to a stretched state to define one or more other traction configurations of the system.