Importance

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Abstract

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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First Claim