Exercise bicycle

An exercise bicycle including a frame with a front end portion and a rear end portion, a seat mounted on said frame, a foot pedal assembly including a pair of foot pedal cranks, a resistance wheel having an axle mounted rotatably on said front end portion of said frame, a transmission system to link said foot pedal assembly to said resistance wheel, and a reciprocating arm assembly including a pair of reciprocating arm levers mounted pivotally on said front end portion of said frame, wherein the improvement comprises:

• said transmission system including:
• a first drive shaft mounted rotatably on said rear end portion of said frame, said foot pedal cranks being mounted on two ends of said first drive shaft;
• a second drive shaft mounted rotatably on said frame between said front and rear end portions;
• a one-way clutch including an inner wheel with an inner periphery and an outer periphery, said inner wheel being secured on said second drive shaft, an outer wheel with an inner periphery and an outer periphery formed with sprocket teeth, and a ratchet-and-pawl unit formed on said outer periphery of said inner wheel and said inner periphery of said outer wheel;
• a third drive shaft mounted rotatably on said frame between said front and rear end portions of said frame;
• a first sprocket mounted securely on said first drive shaft;
• second and third sprockets mounted securely on said second drive shaft;
• a fourth sprocket mounted securely on said third drive shaft;
• a fifth sprocket mounted securely on said axle of said resistance wheel;
• a first drive chain trained between said first sprocket and said outer wheel of said one-way clutch;
• a second drive chain trained between said second and fifth sprockets;
• and a third drive chain trained between said third and fourth sprockets;
• and
• said reciprocating arm assembly further including a pair of crank arms, each of which having a first end connected pivotally to a lower end of a respective one of said arm levers and a second end connected eccentrically to a respective end of said third drive shaft.