| 摘要 |
A concentric, isokinetic exercise apparatus providing accommodating resistance to the exercising user, while maintaining constant speed. The user exercises on a wheel, crank, lever or similar device. The power exerted by the user is applied directly or coupled by means of gears or chains to a rotating brake assembly comprising a braking rotor and a threaded hub. The threaded hub meshes with a threaded axle, turned by a reference motor at a selected speed. When hub and axle rotate at the same speed, the hub does not change its axial position. Any difference of rotational speed between axle and hub results in axial movement of the hub. Whichever of the two speeds is the larger determines the direction of axial movement. If the speed of the hub exceeds that of the axle, the hub with its attached brake rotor is moved towards the brake stator, thereby causing braking action. Conversely, if the hub speed is lower than that of the axle, the brakes disengage and eventually, a switch will interrupt the power to the reference motor.
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