Patent ID: 7497453
Filing Date: 2009-03-03
Classification: B62K,B62M

Abstract:
1. A reciprocal upward and downward pedaling bicycle structure, comprising a frame, a front wheel, a single rear wheel, a handle, a chain wheel, a rear wheel shaft of a free wheel, a main driving belt, and a pair of pedals, characterized in that said structure further comprises: a footrest, disposed separately on both sides of the bottom of said frame; a chain wheel shaft, installed at said frame for positioning said chain wheel and having a main shaft of a free wheel respectively corresponding to each of said pedals; a driving body, pivotally coupled to a position corresponding to said frame for each said main shaft of a free wheel for independent free rotation, and having a crank and a support rod for installing a corresponding one of said pedals; and a driving belt, wound around each said main shaft of a free wheel and having an end installed at said support rod of each said driving body and another end coupled to said frame through a resilient element, such that each said support rod of each said driving body and each said crank can independently provide a lift and an upward swing anytime for each respective pedal; thereby, if a user places a foot to step downward on one of said pedals, said respective support body of said driving body will pull said driving belt and drive said main shaft of a free wheel and said coaxial chain wheel to rotate synchronously, and said chain wheel will drive said rear wheel shaft of a free wheel and said single rear wheel through said main driving belt; and if the user removes the foot from said one pedal, said driving belt will pull said support body of said driving body by a restoring action of said resilient element and an idle rotation of said main shaft of a free wheel to drive said crank and said one pedal to swing upward and prepare for a next pedaling motion.