| 摘要 |
<p>A wrist exerciser includes an upper casing member and a lower casing member that are mounted to each other to enclose a rotor therebetween. The upper casing member has a top opening, which exposes a portion of the rotor. The rotor has opposite sides on which two opposite axles are mounted respectively. The axles are rotatably coupled to an outer ring. The outer ring comprises a resiliency device. The side of the rotor that faces the resiliency device is provided with a movable catching mechanism that is releasably, selectively, and operatively coupled to the resiliency device. Thus, when the rotor is initially rotated or is towed to take a linear movement by being put in contact with a fixture surface, the resiliency device builds up compression spring force, which, when the rotor is released, causes the roto r to rotate in a reversed direction and gaining auxiliary starting power and initial rotation speed. Further, the movable catching mechanism is disengageable from the resiliency device by a centrifugal force acting thereon induced by high speed rotation of the rotor so as to allow for regular operation of the wris t exerciser.</p> |
