A transmitting device for exercise appliances includes a first, a second and a third shaft all fixed on a bike frame in parallel. The first shaft has a first transmitting wheel and a first transmitting wheel, the second shaft has a second transmitting gear with a one-way bearing and a second transmitting gear, and the third shaft has a third transmitting wheel with a one-way bearing, a fourth transmitting wheel and a fifth transmitting wheel. The first transmitting gear engages with the second transmitting gear, the first transmitting wheel is connected with the third transmitting wheel by a first connecting member, the second transmitting wheel is connected with the fifth transmitting wheel by an endless belt. The fourth transmitting wheel always rotates in an ordinary or forward direction, whether the first shaft is rotated in the ordinary or in the reverse direction.

A transmission assembly comprising an overrunning clutch assembly comprising a race having an inner annular contact surface, a plurality of sprags provided along the inner annular contact surface of the race, and defining a drive space, means for retaining the plurality of sprags along the inner annular contact surface of the race, a shaft having a drive portion with a drive diameter sufficient to cause rotation of the shaft in response to a rotation of the race when the drive portion is positioned at least partially within the drive space and means for moving the drive portion of the shaft at least partially into and out of the drive space.

The transmission system of an exercise bicycle includes a first drive shaft mounted rotatably on the rear end portion of a frame and provided with foot pedal cranks on two ends thereof, second and third drive shafts mounted rotatably on the frame, a one-way clutch secured on the second drive shaft, a first sprocket mounted securely on the first drive shaft, second and third sprockets mounted securely on the second drive shaft, a fourth sprocket mounted securely on the third drive shaft, a fifth sprocket mounted securely on an axle of a resistance wheel that is mounted rotatably on a front end portion of the frame, a first drive chain trained between the first sprocket and the one-way clutch, a second drive chain trained between the second and fifth sprockets, and a third drive chain trained between the third and fourth sprockets. The exercise bicycle has a reciprocating arm assembly which includes a pair of reciprocating arm levers mounted pivotally on the front end portion of the frame and a pair of crank arms, each of which having a first end connected pivotally to a lower end of a respective one of the arm levers and a second end connected eccentrically to a respective end of the third drive shaft.

An exercise apparatus includes left and right arm driven members pivotally mounted on a frame. In a first mode of operation, the arm driven members are free to move in opposite directions relative to one another. In a second mode of operation, the arm driven members are constrained to move in a common direction relative to the frame. Leg driven members may be movably mounted on the frame and linked to the arm driven members.

A recuperating machine includes a bottom base and a machine body. The machine body has a frame in the interior, and a pair of grips and a pair of pedals combined on the frame in such way that the grips can be rotated manually and the pedals not moving only for the feet of a user to step on or the pedals possible to be rotated but the grips not moving only for holding by means of a one-way bearing. So a user can select two modes of exercising by moving the hands only or by moving the feet only. Depending on the body condition of the user. Further the frame is pivotally connected with the front end of the bottom base for adjusting its inclining angles to suit to the height of a user sitting on a chair or a wheelchair.