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An exercise bicycle includes a frame, a crank shaft journalled on the rear portion of the frame, and a wheel axle journalled on the front portion of the frame. Two crank arms are secured to two ends of the crank shaft and carry two pedals. Two swing wheels are secured to two ends of the wheel axle a

An exercise bicycle includes a frame, a crank shaft journalled on the rear portion of the frame, and a wheel axle journalled on the front portion of the frame. Two crank arms are secured to two ends of the crank shaft and carry two pedals. Two swing wheels are secured to two ends of the wheel axle and carry two crank pins on which two sheaves are sleeved rotatably. Two swing levers are mounted pivotally on the front portion of the frame at the lower ends thereof and have lengthwise extending slide slots in which the sheaves are received slidably. A rear driving pulley and a rear driven pulley are sleeved rigidly on a sleeve which is sleeved rotatably on the crank shaft. A mechanism is provided between the crank shaft and the sleeve so as to interlock them when the pedals rotate in a predetermined direction. A front driving pulley is sleeved rigidly on the wheel axle. A front driven pulley and a wheel are sleeved rigidly on a wheel hub which is sleeved rotatably on the wheel axle. The front and rear driven pulleys are rotated by the rear and front driving pulleys through belts. The swinging movement of the swing levers and/or the rotation of the pedals can be converted into the rotation of the wheel.

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An exercise bicycle comprising: a frame assembly including a base frame, a wheel frame fixed on a front portion of said base frame, and a seat frame fixed on a rear portion of said base frame; a crank assembly including a crank shaft journalled on said seat frame, two crank arms respectively secured

An exercise bicycle comprising: a frame assembly including a base frame, a wheel frame fixed on a front portion of said base frame, and a seat frame fixed on a rear portion of said base frame; a crank assembly including a crank shaft journalled on said seat frame, two crank arms respectively secured to two ends of said crank shaft, two pedals secured to said crank arms respectively, a sleeve mounted rotatably on said crank shaft, and clutch means for locking said sleeve on said crank shaft when said crank shaft rotates in a predetermined direction, said sleeve including a rear driving pulley sleeved rigidly thereon, and a rear driven pulley sleeved rigidly on said sleeve; a wheel axle assembly including a wheel axle journalled on said wheel frame, a front driving pulley sleeved rigidly on said wheel axle, two swing wheels 20, secured to two ends of said wheel axle at their centers, two crank pins secured eccentrically to outer surfaces of said swing wheels respectively, and two sheaves sleeved rotatably on said crank pins respectively; a pair of hand operated swing levers mounted pivotally at their lower ends on said base frame, each of said levers having a lengthwise extending slide slot formed therethrough in which said sheave is received slidably in such a manner that said sleeve cannot disengage from said slide slot when said swing lever is swung, swinging movement of said swing levers causing the corresponding said swing wheel to rotate in said predetermined direction; a wheel assembly including a wheel hub sleeved rotatably on said wheel axle, a wheel sleeved rigidly on said wheel hub, and a front driven pulley sleeved rigidly on said wheel hub; and a belt assembly including a first endless belt trained on said front driving pulley and said rear driven pulley, and a second endless belt trained on said rear driving pulley and said front driven pulley; whereby, when said pedals are rotated in said predetermined direction, said crank shaft, sleeve, rear driving pulley, second endless belt, front driven pulley, hub and wheel are in turn rotated in said predetermined direction; when said levers are swung, said swing wheels, front driving pulley, first endless belt, rear driven pulley, sleeve, rear driving pulley, second endless belt, front driven pulley, hub and wheel are in turn rotated in said predetermined direction; and when a first torque is applied to said sleeve by rotating said pedals in said predetermined direction, and when a second torque is applied to said sleeve by swinging said levers, the sum of said first and second torques is output from said rear driving pulley.