| 摘要 |
A dumbbell and incremental weight plate for same are disclosed herein comprising a bar that extends generally axially between opposing end regions, a weight plate mass mounted about the bar at each end region, and at least one incremental weight plate mountable on said weigh plate mass. One of the weight plate mass and incremental weight plate has at least a pair of such regions with a north magnetic pole and a south magnetic pole. The other of the weight plate mass and incremental weight plate has at least one magnetic region constituting a magnetic pole. The respective magnetic regions are positioned so that the incremental weight plate is magnetically secured to the weight plate mass through the magnetic coupling between their respective magnetic regions when the incremental weight plate is in a first position with respect to the weight plate mass, and is magnetically repelled from the weight plate mass through the magnetic interaction of their respective magnetic regions when the incremental weight plate is in a second position with respect to the weight plate mass.
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