An exercise bicycle comprising:
- a frame assembly including a base frame, a driven 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 foot operated drive assembly including a driving shaft journalled on said seat frame, a rear driving sprocket sleeved rigidly on an intermediate portion of said driving shaft, two crank arms respectively secured to two ends of said driving shaft, and two pedals secured to said respective crank arms;
- a hand operated drive assembly including a wheel axle journalled on said wheel frame, a front driving sprocket sleeved rigidly on said wheel axle, two swing arms secured to two opposite end portions of said wheel axle, and two hand operated swing levers mounted pivotally at their lower ends on said base frame, each of said levers having a guide-way along a longitudinal axis thereof, each of said swing arms having a crank pin member which is connected slidably to said corresponding lever, so that said crank pin member can slide along said guide-way of said corresponding lever;
- a driven sprocket assembly including a driven shaft journalled on said base frame between said driving shaft and said wheel axle, a foot driven sprocket sleeved rotatably on said driven shaft, clutch means for locking said foot driven sprocket on said driven shaft when said foot driven sprocket rotates in a predetermined direction, a foot driven chain trained on said rear driving sprocket wheel and said foot driven sprocket, a hand driven sprocket sleeved rotatably on said driven shaft, clutch means for locking said hand driven sprocket on said driven shaft when said hand driven sprocket rotates in a predetermined direction, a hand driven chain trined on said front driving sprocket and said hand driven sprocket, and a wheel driving sprocket sleeved rigidly on said driven shaft;
- and
- a wheel assembly including a wheel hub sleeved rotatably on said wheel axle, a wheel sleeved rigidly on said wheel hub, a hub sprocket sleeved rigidly on said wheel hub, and a wheel driving chain trained on said wheel driving sprocket and said hub sprocket;
- whereby, when said pedals are rotated in said predetermined direction, said driving shaft, rear driving sprocket, foot driven chain, foot driven sprocket, driven shaft, wheel driving sprocket, wheel driving chain, hub sprocket, hub, and wheel are in turn rotated in said pedetermined direction;
- when said levers are swung, said wheel axle, front driving sprocket, hand driven chain, hand driven sprocket, driven shaft, wheel driving sprocket, wheel driving chain, hub sprocket, hub, and wheel are in turn rotated in said predetermined direction;
- and
- when a first torque is applied to said driven shaft through said foot driven sprocket by rotating said pedals in said predetermined direction, and when a second torque is applied to said driven shaft through said hand driven sprocket by swinging said levers, the sum of said first and second torques are output through said wheel driving sprocket.