(BE1004971-A6)      A rotary element, mounted on a frame (11) turns freely on a horizontal axis (18) and is mechanically coupled to an inertia flywheel (15). A strap (16) is tightened around the flywheel and has its ends fixed to a pin (17) and a spring (18).    A microprocessor (20) stores information on torques for theoretical runs and, in response to the actual torque, generates a signal to change the torque by means of an adjustable tension device (19) joined to the spring. The rotating element may be coupled to a chain wheel (2) of a bicycle or the frame.    ADVANTAGE -   Gives sensation of motion similar to real journey, improves user motivation.    (EP539543-A1)      A rotary element, mounted on a frame (11) turns freely on a horizontal axis (18) and is mechanically coupled to an inertia flywheel (15). A strap (16) is tightened around the flywheel and has its ends fixed to a pin (17) and a spring (18).    A microprocessor (20) stores information on torques for theoretical runs and, in response to the actual torque, generates a signal to change the torque by means of an adjustable tension device (19) joined to the spring. The rotating element may be coupled to a chain wheel (2) of a bicycle or the frame.    ADVANTAGE -   Gives sensation of motion similar to real journey, improves user motivation.    (US5292293-A)      The training machine has a frame on which is mounted an element freely rotating about a horizontal axis, and an inertial flywheel coupled to the rotating element. A strap is tightened about the flywheel. The rotating element is mechanically coupled to the flywheel and a microprocessor is mounted on the frame to provide a control signal for the adjustable traction device.    The control signal corresponds to an adjustable and predefined simulated difficulty to be encountered. The microprocessor is designed to store the torques theoretically needed for several predefined simulated runs and, in response to a signal corresp. to the actual torque, to generate a second signal corresp. to the variation in the torque required to attain the torque theoretically needed for the corresp. simulated run. The second signal controls the adjustable traction device.    USE -   For allowing individual to undertake physical exercise and training with aid of pedal drive mechanism.    (EP539543-B1)      A physical exercise apparatus comprising a stand on which are mounted a rotary member mounted so as to be able to turn freely about a horizontal pin, an inertia flywheel (15) coupled to the rotary member, and s trap (16) clamped around part of the perimeter of the inertia flywheel, and attached at one end to a pin (17) fixed to the stand and attached at its opposite end to the end of a spring (18), the other end of the spring (18) being connected to an adjustable traction device (19) mounted on the stand in such a way as to exert a predetermined tensile force on the spring (18) and strap (16), characterized in that the inertia flywheel (15) is coupled mechanically to a device (21) for measuring the change in the drive torque relative to the braking force exerted by the inertia flywheel and for producing an electrical signal representing the said change, the aforementioned measuring device comprising a drive pinion (23) designed to be driven by a pedal drive mechanism (2) and a pulley (24) coupled mechanically to the inertia flywheel (15), said pulley being also coupled to the drive pinion (23) by means of a number of compressed springs (31), each spring being held between a first ball (33) fixed to the drive pinion (23) and a second ball (34) fixed to the pulley (24), a number of first annular segments (25) fixed to the perimeter of the pulley (24) and a number of second annular segments (28) fixed to the perimeter of the pinion (23), the said first and second annular segments being arranged in such a way that the mutually confronting ends of each first annular segment (25) and the consecutive second annular segment (28) are separated, forming a slot (35) which is proportional to the braking force, and a device (37) for measuring the length of said slots (35) and for producing electrical signals representing the change in length of said slots (35) and accordingly the change in drive torque.