Mark B Roth

US Patent:

58399976, Nov 24, 1998

Filed:

Jan 22, 1998

Appl. No.:

/010863

Inventors:

Mark R. Roth - Holly MI
Jon D. Schiff - St. Joseph MI
Thomas M. Truran - St. Joseph MI

Assignee:

Premise Group LLC - St. Joseph MI

International Classification:

A63B 21075

US Classification:

482107

Abstract:

A weight-lifting apparatus includes a plurality of weights each having a central hole and a slot extending from the central hole to a perimeter of the associated weight, the slot having a width less than the diameter of the central hole. The apparatus further includes a shaft having opposing ends defining a diameter about equal to the central holes, and a sleeve positioned on the shaft. The shaft is shaped to rotatably engage the central holes and is rotatable to different positions. The shaft further has a plurality of recessed surfaces on the opposing ends corresponding to the different positions that extend different longitudinal lengths, the recessed surfaces defining with other surfaces on the shaft a reduced dimension about equal to the width of the slot. Further, the shaft and the weights are configured so that by rotating the shaft, the recessed surfaces are selectively positioned to allow the shaft to slide along one or more of the slots, thus selectively releasing the weights. A person using the weight-lifting apparatus can easily rotate the shaft to select a desired number of weights without interrupting their exercise routine.