Patent ID: 7285078
Filing Date: 2007-10-23
Classification: A63B,Y10S

Abstract:
1. An adjustable dumbbell comprising: a plurality of weights, each of which has an edge and a central hole and a slot extending through the central hole; a weight-lifting shaft; and a holder; wherein: the holder cooperates with the weight-lifting shaft to form a self-locking mechanism; the weight-lifting shaft comprises a grip handle, a rotatable spindle extending through the grip handle, several cam plates assembled through both ends of the rotatable spindle, and adjustment knobs assembled on both sides of the weight-lifting shaft; the outer diameters of the cam plates fit the central hole of the weights; and the holder comprises grooves and protrusion blocks; the grooves fit the weights and the protrusion blocks cooperate with the pins on the weight-lifting shaft to form a self-locking means.