Weight lifting apparatus with weight disks

Abstract

An adjustable weight lifting apparatus includes a weight lifting device to which a desired amount of weight is attached by attaching a desired number of weight disks and/or auxiliary weights to the weight lifting device. Weight disks are attached to or detached from to the weight lifting device by intermittently advancing pins from or retracting pins into the weight lifting device. Auxiliary weights in differing amounts can be provided to facilitate adjustment of the amount of weight attached to the weight lifting device in smaller amounts than is achieved by attaching or detaching individual weight disks. The weight disks can be prevented from moving radially relative to each other by protrusions and mating recesses on the weight disks. The protrusions can be removably attached to the weight disks.

What is claimed is: 
     
         1 . An adjustable weight lifting apparatus, comprising:
 a weight lifting device comprising first and second axially outer surfaces;   a plurality of weight disks removably attachable to the first and second axially outer surfaces of the weight lifting device and to each other; and   each weight disk comprising a main body portion, a protrusion removably attachable to the main body portion, and a recess, the protrusion of a first one of the plurality of weight disks being adapted to be removably received in the recess of a second one of the plurality of weight disks, the first and second ones of the plurality of weight disks being radially movable but not axially movable relative to each other when the protrusion of the first one of the plurality of weight disks is received in the recess of the second one of the plurality of weight disks.   
     
     
         2 . The adjustable weight lifting apparatus as set forth in  claim 1 , wherein the protrusion of the second one of the plurality of weight disks is adapted to be removably received in the recess of the first one of the plurality of weight disks when the protrusion of the first one of the plurality of weight disks is removably received in the recess of the second one of the plurality of weight disks. 
     
     
         3 . The adjustable weight lifting apparatus as set forth in  claim 1 , wherein the first and second axially outer surfaces of the weight lifting device each include an axially outer surface protrusion and an axially outer surface recess, the axially outer surface protrusions of the first and second axially outer surfaces being adapted to be removably received in the recess of corresponding weight disks of the plurality of weight disks, the weight lifting device and the corresponding weight disks being radially movable but not axially movable relative to one another when the axially outer surface protrusions of the first and second axially outer surfaces are received in the recesses of the corresponding weight disks. 
     
     
         4 . The adjustable weight lifting apparatus as set forth in  claim 3 , wherein the axially outer surface protrusions of the first and second axially outer surfaces are removably attachable to the first and second axially outer surfaces of the weight lifting device. 
     
     
         5 . The adjustable weight lifting apparatus as set forth in  claim 1 , wherein the protrusion on each weight disk comprises a knob having a narrowest end closest to the main body portion and a wider end furthest from the main body portion. 
     
     
         6 . The adjustable weight lifting apparatus as set forth in  claim 5 , wherein the recess includes a narrowest end closest to an outer surface of the main body portion and a widest end axially inward of the outer surface of the main body. 
     
     
         7 . The adjustable weight lifting apparatus as set forth in  claim 5 , wherein the protrusion on each weight disk is removably attachable to the main body portion by a bolt. 
     
     
         8 . The adjustable weight lifting apparatus as set forth in  claim 1 , wherein the recess on each weight disk is provided in a component removably attachable to the main body portion. 
     
     
         9 . The adjustable weight lifting apparatus as set forth in  claim 8 , wherein the recess includes a narrowest end closest to an outer surface of the main body portion and a widest end axially inward of the outer surface of the main body. 
     
     
         10 . A weight disk for an adjustable weight lifting apparatus, the adjustable weight lifting apparatus comprising a plurality of weight disks removably attachable to each other, the weight disk comprising a main body portion, a protrusion removably attachable to the main body portion, and a recess, the protrusion of the weight disk being adapted to be removably received in the recess of another one of the plurality of weight disks, the weight disk and the other one of the plurality of weight disks being radially movable but not axially movable relative to each other when the protrusion of the weight disk is received in the recess of the other one of the plurality of weight disks. 
     
     
         11 . The weight disk as set forth in  claim 10 , wherein the protrusion of the other one of the plurality of weight disks is adapted to be removably received in the recess of the weight disks when the protrusion of the weight disk is removably received in the recess of the other one of the plurality of weight disks. 
     
     
         12 . The weight disk as set forth in  claim 10 , wherein the protrusion on the weight disk comprises a knob having a narrowest end closest to the main body portion and a wider end furthest from the main body portion. 
     
     
         13 . The weight disk as set forth in  claim 12 , wherein the recess includes a narrowest end closest to an outer surface of the main body portion and a widest end axially inward of the outer surface of the main body. 
     
     
         14 . The weight disk as set forth in  claim 12 , wherein the protrusion on the weight disk is removably attachable to the main body portion by a bolt. 
     
     
         15 . The weight disk as set forth in  claim 10 , wherein the recess on each weight disk is provided in a component removably attachable to the main body portion. 
     
     
         16 . The weight disk as set forth in  claim 12 , wherein the recess includes a narrowest end closest to an outer surface of the main body portion and a widest end axially inward of the outer surface of the main body.