Patent ID: 6277058
Filing Date: 2001-08-21
Classification: A63B

Abstract:
A weight stack for an exercise machine comprising:a single stack of a plurality of weight plates extending vertically from a lowermost weight plate to an uppermost weight plate, each weight plate between the uppermost weight plate and the lowermost weight plate in contact with a pair of adjacent weight plates;a lift shaft having a plurality of spaced apertures, at least two of the apertures having different dimensions;at least two selector pins, each selector pin having a dimension corresponding to one of the at least two dimensions of the apertures of the lift shaft;each weight plate including a central bore to receive the lift shaft;each weight plate further including an opening having a size corresponding to one of the at least two dimensions of the apertures of the lift shaft such that a correspondingly dimensioned selector pin is selectively inserted into the opening to engage with the correspondingly dimensioned aperture of the lift shaft so that all weight plates above a selected weight plate are lifted when the lift shaft is lifted; andthe dimensions of the apertures and size of the openings are progressively dimensioned such that a selector pin corresponding to the opening of the uppermost weight plate and its corresponding aperture in the lift shaft is physically restricted from insertion into the opening of the lowermost weight plate and its corresponding aperture in the lift shaft, so that a user is restricted in the amount of weight resistance available dependent upon the selector pin in the user's possession.