Adjustable dumbbell

Abstract

A dumbbell may include a handle, a first weighted portion and a second weighted portion, wherein the first weighted portion and the second weighted portion are located at two opposite ends of the handle. In one embodiment, the first weighted portion has a cover and a receiving space, and the receiving space has a center receiving hole and a plurality of surrounding receiving holes, each of which is configured to receive an elongated center weighted unit and one or more surrounding weighted units. Likewise, the second weighted portion has a cover and a receiving space having a center receiving hole and a plurality of surrounding receiving holes that can be used to receive each of the center and surrounding elongated weighted units. In one embodiment, the cover can be threadedly engaged with the outer peripheries of the first and second weighted portions.

What is claimed is: 
     
         1 . A dumbbell comprising a handle, a first weighted portion and a second weighted portion, and the first weighted portion and the second weighted portion are located at two opposite ends of the handle,
 wherein the first weighted portion has a cover and a receiving space, and the receiving space has a center receiving hole and a plurality of surrounding receiving holes; said center receiving hole is configured to receive an elongated center weighted unit and the surrounding receiving holes are configured to receive one or more surrounding weighted units;   wherein the second weighted portion has a cover and a receiving space, and the receiving space has a center receiving hole and a plurality of surrounding receiving holes; said center receiving hole is configured to receive an elongated center weighted unit and the surrounding receiving holes are configured to receive one or more surrounding weighted units, and the weight of the dumbbell can be adjusted by adding or removing the weighted units.   
     
     
         2 . The dumbbell of  claim 1 , wherein the cover is threadedly engaged with an outer peripheries of each of the first and second weighted portions. 
     
     
         3 . The dumbbell of  claim 1 , wherein the center weighted unit is heavier than the surrounding weighted units. 
     
     
         4 . The dumbbell of  claim 1 , wherein each of the surrounding weighted units may have different weights. 
     
     
         5 . The dumbbell of  claim 1 , wherein one end of the center weighted unit is removably received in a center receiving hole in the receiving space, and the other end thereof is removably received in a cover receiving space to further secure the center weighted unit. 
     
     
         6 . The dumbbell of  claim 1 , wherein the surrounding weighted units are arranged in a circular manner surrounding the center weighted unit, corresponding to the arrangement of the center receiving hole and surrounding receiving holes. 
     
     
         7 . The dumbbell of  claim 1 , wherein one end of each of the surrounding weighted units is removably received in the receiving hole, and the other end thereof is removably received in a circular receiving area in the cover. 
     
     
         8 . The dumbbell of  claim 6 , wherein one end of each of the surrounding weighted units is removably received in the receiving hole, and the other end thereof is removably received in a circular receiving area in the cover.