Patent ID: 7021639
Filing Date: 2006-04-04
Classification: B62M

Abstract:
1. A bicycle of the type driven by operation of a handle, comprising a front wheel and a rear wheel, which are installed at front and rear sides of a frame, a shaft rod to which the handle is connected, the shaft rod being integrally coupled at an upper certain position thereof to the frame at a right angle and connected at a lower end thereof to a center shaft of the front wheel, a sprocket provided at a lower portion of the frame near the rear wheel, the sprocket being formed with a pedal, a chain for transmitting a driving force of the pedal formed at the sprocket to the rear wheel, and a saddle installed at an upper portion of the frame, further comprising: a hinge installed at the shaft rod so as to enable the handle to rotate forward or backward by means of the hinge, the handle being bent by a constant angle on the basis of the hinge, thereby being divided into both upper and lower portions; an elongated guide bore formed at the lower portion of the handle; a roller inserted inside the guide bore so as to move upward and downward along the guide bore; a rod connected at an upper end thereof to the roller so as to move upward and downward in a rectilinear course according to pulling and pushing operations of the handle; a rotating cam associated with a lower end of the rod by means of a connection link; a driving gear installed at one side of the cam so as to rotate along with the cam; a ratchet provided at an internal portion of the driving gear so as to rotate in only one direction due to a stopper; an auxiliary sprocket installed around an outer periphery of the driving gear so as to rotate along with the driving gear; and a center shaft gear integrally installed to the center shaft of the front wheel so as to be associated with the auxiliary sprocket through a chain.