(FR2713841-A1)      The braking device comprises a rotating housing (1), a magnetic conductor ring (2), a shaft member (3), and a positioning device including a sliding stator (5) carrying permanent magnets (50) housing and a drive motor (61). The shaft member includes a threaded section (31) which engages gears (62) driven from motor (61) which causes stator housing to slide usually along the support rails (41) of frame assembly (41,42,43). The effective coupling area between the permanent magnetic conductor ring (2) can be adjusted to provide variable braking torque (load) of a sporting device.    A flexible plate is disposed on one side of a decoder and is driven by a worm gear (62') by the contact of the flexible plate to the decoder circuit.    ADVANTAGE -   Has a compact size for easily applying in different sporting equipment. The braking value can be set previously and then the braking device can control the couple area between the magnetic and magnetic conductor ring to adjust the braking resistance continuously.    (US5437353-A)      he magnetic adjustable braking device, comprises a rotating housing having a flywheel which connects with a belt being integrated at the outer wall of the rotating housing, with a bearing being disposed inside the flywheel. A magnetic conductor ring is disposed at the inner periphery of the rotating housing. A shaft member is disposed inside the bearing of the flywheel, and has a worm gear portion at a middle portion of the shaft member. A positioning device has a supporting post, inner guiding plate and an outer guiding plate and is connected to the shaft member by a hole. A sliding housing has a lubricated bearing slidably received by the supporting post, and a permanent magnet disposed at inner ring portion of the sliding housing.    A driving device is disposed inside the sliding housing, and includes a driving motor supported by a bracket, a pinion disposed at the output shaft of the motor, a and pair of rod members which pass through the bracket. The rod members are connected via a pair of gears disposed respectively at the rod members. The gears are meshed and driven by the pinion, accordingly, and the rod members are rotated in different directions. The middle portion of each of the rod members are provided with a further worm gear which is meshed with the worm gear portion of the shaft member. A decoder ia disposed at one side of the driving device, and a flexible plate is disposed on one side of the decoder and driven by the worm gear, by the contact of the flexible plate to the circuit of the decoder. The rotational position of the worm gear can be supplied to a control panel by a socket.    ADVANTAGE -   Has compact configuration, stable performance and excellent durability.