Patent ID: 7182716

Claim:
A dumbbell which comprises: a handle tube having an interior surface; said interior surface having an interior thread extending from one end to the opposite end of the handle tube; a pair of stop plates; each said stop plate having an aperture centrally located in each stop plate, respectively; one of said stop plates mounted perpendicularly and concentrically on one end of said handle tube and another one of said stop plates mounted perpendicularly on an opposite end of said handle tube; said interior surface having a straight groove extending from one end to an opposite end of said handle tube; a pair of shafts, one shaft for each end of said handle tube; each shaft having a retainer plate mounted perpendicularly and concentrically on one end of said each shaft; each shaft having a linear partial thread mounted on a surface of said each shaft; said partial thread extending from one end to an opposite end of said shaft, respectively; one plurality of weight plates, each said weight plate having a centically located aperture to permit mounting said one plurality of weight plates on one said shaft by inserting said shaft through said apertures; and another plurality of weight plates, each said weight plate having a centically located aperture to permit mounting said another plurality of weight plates on another one of said pair of shafts by inserting said another one shaft through said apertures in said another plurality of weight plates; each said shaft having a diameter and said partial thread having a pitch and width and said interior thread having a pitch and said groove having a width all arranged in operable combination to permit aligning said partial thread with said groove then telescoping each said shaft into an interior at respective ends of said tube, then turning said shaft to engage said partial thread on said shaft with said partial thread whereby said shaft is detachably secured to said handle tube and said one and another plurality of weights are secured between said one and another retainer and stop plates, respectively.