Adjustable dumbbell

Abstract

An adjustable dumbbell includes a handle assembly and weight assemblies. The weight assemblies connect ends of the handle assembly. Each weight assembly includes an outer shell assembly, a counterweight element, and a locking assembly. The outer shell assembly includes a housing, the housing is connected to the handle assembly. A receiving cavity is defined in the housing. An opening communicated with the receiving cavity is defined at a side of the housing facing the handle assembly. The counterweight element is detachably received in the receiving cavity. The counterweight is fixed with the outer shell assembly by the locking element. The adjustable dumbbell of the disclosure hides the counterweight element, locking element, and two ends of the handle assembly in the outer shell element, prevents the counterweight element from shaking and making abnormal noise due to collision, and raising appearance beauty of the adjustable dumbbell.

What is claimed is: 
     
         1 . A adjustable dumbbell comprising:
 a handle assembly;   weight assemblies connected to the handle assembly; wherein each of the weight assemblies comprise:   an outer shell assembly comprising a housing, wherein the housing is connected to the handle assembly, a receiving groove is defined in the housing, an opening is defined at a side of the housing facing the handle assembly, the opening is communicated with the receiving cavity; the receiving cavity is configured to receive a counterweight element; and   a locking element, the locking element is connected to the housing, and the locking element fixes the counterweight element to the outer shell assembly.   
     
     
         2 . The adjustable dumbbell of  claim 1 , wherein at least one connecting hole is defined on the housing, at least one first through hole is defined on the counterweight element, the at least one first through hole is correspondingly positioned relative to the at least one connecting hole, the locking element penetrates the connecting hole and the first through hole and locks with the housing. 
     
     
         3 . The adjustable dumbbell of  claim 2 , wherein the housing, counterweight element, and the handle assembly are positioned co-axial, two connecting holes are defined at a diagonal position of the housing, and two of the at least one first through holes which correspond to two of the at least one connecting holes are defined at a diagonal position of the counterweight element. 
     
     
         4 . The adjustable dumbbell of  claim 2 , wherein the locking element is threaded with the connecting hole. 
     
     
         5 . The adjustable dumbbell of  claim 2 , wherein the counterweight element comprises several weight pieces, the several weight pieces are stacked and detachably received in the receiving cavity, the first through hole penetrates the several weight pieces. 
     
     
         6 . The adjustable dumbbell of  claim 5 , wherein each of the several weight pieces has a sheet structure. 
     
     
         7 . The adjustable dumbbell of  claim 6 , wherein each of the weight pieces has same shape. 
     
     
         8 . The adjustable dumbbell of  claim 1 , wherein two of the weight assemblies are symmetrically connected at two ends of the handle assembly. 
     
     
         9 . The adjustable dumbbell of  claim 1 , wherein a second through hole is defined on the housing, and an axis of the second through hole is coaxial with an axis of the handle assembly, the handle assembly is connected with the housing by the second through hole. 
     
     
         10 . The adjustable dumbbell of  claim 9 , wherein handle assembly comprise a central handle, two connecting portions, and two nuts, the two connecting portions are respectively arranged at two ends of the central handle, a diameter of the connecting portion is smaller than a diameter of the central handle, each of the connecting portions penetrates a corresponding one of the second through holes, each of the two nuts abuts against the housing and connects to a corresponding one of the two connecting portions. 
     
     
         11 . The adjustable dumbbell of  claim 10 , wherein each of the connecting portions is provided with a thread and a smooth surface, the thread is arranged on a radial surface of an end of the connecting portion away from the central handle, the smooth surface is arranged on the radial surface of an end of the connecting portion near the central handle, the housing is sleeved on the connecting portion, the smooth surface of the connecting portion is fitted with the second through hole, and the thread of the connecting portion is threaded with the nut. 
     
     
         12 . The adjustable dumbbell of  claim 1 , wherein the outer shell assembly comprises:
 a first cover positioned at the opening of the housing, a third through hole defined on the first cover, wherein the handle assembly penetrates the third through hole to connect the housing and to fix the first cover to the housing.   
     
     
         13 . The adjustable dumbbell of  claim 1 , wherein the outer shell assembly comprise:
 an elastic ring sleeved on a first surface of the housing, the first surface is a surface of the housing parallel to an axis of the handle assembly;   a second cover positioned at a second surface of the housing, the second surface is an outer surface of the housing perpendicular to the axis of the handle assembly.   
     
     
         14 . The adjustable dumbbell of  claim 13 , wherein the housing comprises a clamping portion, the clamping portion is positioned on the first surface of the housing, a clamping groove is defined on an inner side of the elastic ring, the clamping portion is positioned in the clamping groove to fix the elastic ring and the housing. 
     
     
         15 . The adjustable dumbbell of  claim 14 , wherein a head of the clamping portion is provided with a reverse buckle structure, the reverse buckle structure forms an interference fit between the head of the clamping portion and the clamping groove.