Patent ID: 7819786

Claim:
Dumbbell assembly, comprising: a. a handle having two opposing ends with a stub portion near each of the two opposing ends; b. a flange formed at each junction of the handle and the stubs, with a plurality of through holes evenly made through each of the flanges; and, c. two weight-heads, each containing a center hole for snugly receiving the stub and corresponding holes for the through holes of the flanges whereby screws are selectively tightened from the through hole into the corresponding holes on the weight-heads; wherein the stubs of said handle are machined to have regular threadlines, and the center hole of said weight-heads is machined to contain matching threadlines, so that the weight-heads are screwed into to the stubs of the handle, before the screws are used to attach said flanges to weight-heads by the through holes on the flanges.