Patent ID: 6497639
Filing Date: 2002-12-24
Classification: A63B

Abstract:
A stackable weight for an exercise machine weight stack, comprising:a plate of predetermined weight having front and rear edges, opposite side edges, upper and lower faces, and a selector stem aperture extending between the upper and lower faces; the upper face having a raised central rib extending from the front edge to the rear edge and the lower face having a central indent extending from the front edge to the rear edge and of shape and dimensions matching that of the central rib on the upper face, whereby plates can be stacked together with the central indent on the lower face of one plate in mating engagement with the central rib on the upper face of an underlying plate; the rib and indent each having a linear keyway of width less then the width of the rib and indent, each keyway bisecting the selector stem aperture whereby, when two plates are nested together, the keyway in the indent of one plate will be aligned with the keyway on the rib of the underlying plate; and the keyway in the indent extending from the front edge of the plate for allowing a selector pin to be inserted between the two plates along the keyways and through a hole in a selector stem, in order to chose the number of weight plates to be lifted in an exercise.