Patent ID: 6672418
Filing Date: 2004-01-06
Classification: B62M

Abstract:
A power assisted, manually powered vehicle having at least one driving wheel, an operator driven driving member to which an operator applies a force manually, a first transmission coupling said operator driven driving member to said driving wheel for operator powered driving of said vehicle, said first transmission including a lost motion connection between said operator driven driving member and driving wheel, an assist motor for exerting a driving force to said vehicle through a second transmission, a differential transmission connected between said operator driven driving member and said driving wheel for providing a signal indicative of change in phase between said operator driven driving member and said driving wheel, said wheel being driven by a sprocket forming a portion of said first transmission and said lost motion connection is formed by said sprocket and an adjacent disk shaped member and juxtaposed to said sprocket and driven by said first transmission, said lost motion connection being resiliently biased to resist relative rotation.