Weight adjustable dumbbell

Abstract

An adjustable dumbbell, comprises a primary section including a plurality of end structures, a handle and a weight selection structure configured to be advanced from the primary section and having a weight selection mark showing the amount of weight selected; and a plurality of nested weights each constructed from a pair of corresponding attached plates arranged in a longitudinal stack and each plate having a corresponding structure configured to accept the weight selection structure. In one embodiment, the weight selection structure includes a gear attached to the primary section for rotation by a user and a toothed rod coupled to the gear which is displaced into the nested weights a distance corresponding to the mark showing the amount of weight selected.

1 . An adjustable dumbbell, comprising: 
 a primary section including a plurality of end structures, a handle and a weight selection structure configured to be advanced from the primary section and having a weight selection mark showing the amount of weight selected; and    a plurality of nested weights each constructed from a pair of corresponding attached plates arranged in a longitudinal stack and each plate having a corresponding structure configured to accept the weight selection structure.    
     
     
         2 . The adjustable dumbbell of  claim 1 , wherein: 
 the weight selection structure includes a gear attached to the primary section for rotation by a user and a toothed rod coupled to the gear which is displaced into the nested weights a distance corresponding to the mark showing the amount of weight selected.    
     
     
         3 . The adjustable dumbbell of  claim 1 , wherein: 
 the corresponding structure of each plate that is configured to accept the weight selection structure is a hole.    
     
     
         4 . The adjustable dumbbell of  claim 2 , wherein: 
 the corresponding structure of each plate that is configured to accept the weight selection structure is a hole.    
     
     
         5 . The adjustable dumbbell of  claim 1 , wherein: 
 the primary section includes a plurality of cross members configured to support the end structures.    
     
     
         6 . The adjustable dumbbell of  claim 2 , wherein: 
 the primary section includes a plurality of cross members configured to support the end structures.    
     
     
         7 . The adjustable dumbbell of  claim 5 , wherein: 
 the weight selection structure includes a first weight selector disposed within a first cross member for coupling plates adjacent to a first end structure of the primary section, and a second weight selector disposed within a second cross member for coupling plates adjacent to a second end structure of the primary section.    
     
     
         8 . The adjustable dumbbell of  claim 7 , wherein: 
 the first weight selector includes a first gear attached to the primary section for rotation by a user and a first toothed rod coupled to the first gear which is displaced into a first side of the nested weights a distance corresponding to the mark showing the amount of weight selected; and    the second weight selector includes a second gear attached to the primary section for rotation by the user and a second toothed rod coupled to the second gear which is displaced into a second side of the nested weights a distance corresponding to the mark showing the amount of weight selected.    
     
     
         9 . The adjustable dumbbell of  claim 8 , wherein: 
 the corresponding structure of each plate that is configured to accept the weight selection structure is a hole.    
     
     
         10 . The adjustable dumbbell of  claim 1 , wherein: 
 the plates are marked showing the amount of weight corresponding to the respective plate when coupled to the primary section.    
     
     
         11 . The adjustable dumbbell of  claim 2 , wherein: 
 the plates are marked showing the amount of weight corresponding to the respective plate when coupled to the primary section.    
     
     
         12 . The adjustable dumbbell of  claim 7 , wherein: 
 the plates are marked showing the amount of weight corresponding to the respective plate when coupled to the primary section.    
     
     
         13 . The adjustable dumbbell of  claim 8 , wherein: 
 the plates are marked showing the amount of weight corresponding to the respective plate when coupled to the primary section.    
     
     
         14 . The adjustable dumbbell of  claim 5 , wherein: 
 selected cross members include a cushion while other cross members do not include a cushion.    
     
     
         15 . The adjustable dumbbell of  claim 7 , wherein: 
 selected cross members include a cushion while other cross members do not include a cushion.    
     
     
         16 . The adjustable dumbbell of  claim 8 , wherein: 
 selected cross members include a cushion while other cross members do not include a cushion.