Patent ID: 6371501
Filing Date: 2002-04-16
Classification: B62M

Abstract:
A tread wheel frame system for a human-powered cycle comprising:an adjustable axle; a tread wheel rotatably mounted on said adjustable axle; controlling means, including fittings connected to the ends of said adjustable axle, to control said tread wheel; rear frame members having upper portions connected respectively to said controlling means; substantially vertical frame members having upper portions connected respectively to upper ends of said rear frame members; a saddle tube connected to the upper ends of said substantially vertical frame members; lower frame members having the rear portions connected respectively to the lower ends of said rear frame members, and having the middle portions connected respectively to the lower ends of said substantially vertical frame members; a drive wheel disposed substantially below, and being controlled by, said tread wheel; a drive wheel axle connected to the rear portions of said lower frame members; a hub assembly connected to the middle portions of said lower frame members; driving means including pedals, crank arms, crank axle, and drive pulley rotatably connected to said hub assembly, to utilize the power of a pedaling motion; power transmission means, including a drive belt connected to said drive pulley, to convey power; a speed ratio mechanism, including a pulley cluster, rotatably mounted on said adjustable axle, driven by said power transmission means; shifting means, including a derailleur mounted on the middle portion of said rear frame member, to operate said speed ratio mechanism; transmitting means, including a ratchet integral with said speed ratio mechanism, to convey power to said tread wheel; a power unit device connected to the middle portion of said saddle tube, in combination with said tread wheel for driving, including braking, said drive wheel; whereby power transmitted to said drive wheel controls the motion of said cycle.