Patent ID: 7261678

Claim:
An adjustable dumbbell system, comprising: (a) a dumbbell comprising: (i) a handle; (ii) an inner support mounted on the handle and substantially fixed relative to the handle; (iii) an inner disc rotatably mounted on the handle; (iv) a plurality of intercoupled collars each including at least one flange, the plurality of intercoupled collars being further intercoupled with the inner disc; (v) a rotational interference device for coupling the inner disc to the inner support; (vi) a selector device intercoupled with the plurality of intercoupled collars and the inner disc; and (b) a base support comprising: (i) a plurality of weights, each weight having a tab; (ii) a plurality of positioning walls for supporting the weights; and (iii) an actuator for releasing the rotational interference device, whereby some combination of the plurality of weights are selected by engaging the at least one flange of at least one of the collars with the tab of the weight.