| 摘要 |
The present invention relates to a bicycle which has multiple upgraded bicycle functions, and in which a rear-wheel gear-shifting device is installed at a front wheel in order to assist the bicycle in slow hill-climbing using less effort. To this end, a primary gear crank device is installed at one side of a bicycle body, two or more gears are installed at the gear crank device, and each gear has a chain mounted thereon so as to transmit the kinetic energy produced by the vertical movement of a handle connected to a piston to a secondary gear-shifting device and to a pedal gear crank device. In addition, the saddle of the bicycle of the present invention is movable in the upward and downward directions and in the left and right directions, and a detachable accelerating auxiliary device, which operates by means of the force of the shoulder of a rider and the weight of the upper half of the body of the rider, is installed on the bicycle to increase power. The multiple upgraded bicycle functions of the bicycle of the present invention are characterized as including the above-described steps. |
