Interconnecting or Stackable Dumbbells

Abstract

Dumbbells that interconnect or stack upon each other without the need for a storage rack. The dumbbells include a top engagement member and a bottom engagement member, where the top engagement member is configured and shaped to accommodate and mate with the bottom engagement member. The top engagement member is preferably a protrusion having a generally flat face and a sloping sidewall, and the bottom engagement member is preferably a recess having a generally flat base and a sloping sidewall. The dumbbells may interconnect or stack flush with one another to form a column.

1 . A dumbbell comprising:
 two enlarged weight members at either end of a handle, where each of the weight members comprises a top surface with a first engagement member and a bottom surface with a complementary second engagement member, and where the first engagement member accommodates and mates with a second engagement member of a second dumbbell.   
   
   
       2 . The dumbbell of  claim 1 , where the top surface and the bottom surface each have a generally elliptical shape, and each of the first engagement members is a protrusion located at an approximate center of the top surface and each of the second engagement members is a recess located at an approximate center of the bottom surface. 
   
   
       3 . The dumbbell of  claim 2 , where each of the first engagement members is a generally elliptical protrusion and each of the second engagement members is a generally elliptical recess. 
   
   
       4 . The dumbbell of  claim 2 , where each of the first engagement members is a generally circular protrusion and each of the second engagement members is a generally circular recess. 
   
   
       5 . The dumbbell of  claim 2 , where the protrusion comprises a generally flat face and the recess comprises a generally flat base. 
   
   
       6 . The dumbbell of  claim 2 , where the protrusion comprises a generally convex face and the recess comprises a generally concave base. 
   
   
       7 . The dumbbell of  claim 1 , where the top surface and the bottom surface each have a generally elliptical shape, and where each of the first engagement members is a generally elliptical protrusion comprising a generally flat face and are located at an approximate center of the top surface, and each of the second engagement members is a generally elliptical recess comprising a generally flat base and located at an approximate center of the bottom surface. 
   
   
       8 . The dumbbell of  claim 1 , where the top surface and the bottom surface each have a generally circular shape, and where each of the first engagement members is a generally circular protrusion comprising a generally flat face and are located at an approximate center of the top surface, and each of the second engagement members is a generally circular recess comprising a generally flat base and located at an approximate center of the bottom surface. 
   
   
       9 . The dumbbell of  claim 1 , where the top surface and the bottom surface each have a generally elliptical shape, and where each of the first engagement members is a generally elliptical protrusion comprising a generally convex face and are located at an approximate center of the top surface, and each of the second engagement members is a generally elliptical recess comprising a generally concave base and located at an approximate center of the bottom surface. 
   
   
       10 . The dumbbell of  claim 1 , where the top surface and the bottom surface each have a generally circular shape, and where each of the first engagement members is a generally circular protrusion comprising a generally convex face and are located at an approximate center of the top surface, and each of the second engagement members is a generally circular recess comprising a generally concave base and located at an approximate center of the bottom surface. 
   
   
       11 . The dumbbell of  claim 1 , where each of the first engagement members comprises a generally flat face and a generally vertical sidewall between the face and the top surface, and where each of the second engagement members comprises a generally flat base and a generally vertical sidewall between the base and bottom surface. 
   
   
       12 . The dumbbell of  claim 1 , where each of the first engagement members comprises a generally convex face and a generally vertical sidewall between the face and the top surface, and where each of the second engagement members comprises a generally concave base and a generally vertical sidewall between the base and bottom surface. 
   
   
       13 . A pair of dumbbells, each dumbbell comprising:
 two enlarged weight members at either end of a handle, where each of the weight members comprises a top surface with a first engagement member and a bottom surface with a complementary second engagement member;   where the first engagement member of the first dumbbell accommodates and mates with the second engagement member of the second dumbbell, such that the first dumbbell is capable of stacking horizontally upon the second dumbbell.   
   
   
       14 . The pair of dumbbells of  claim 12 , where each of the top surfaces and each of the bottom surfaces have a generally elliptical shape, and where each of the first engagement members is a protrusion located at an approximate center of the top surface and each of the second engagement members is a recess located at an approximate center of the bottom surface. 
   
   
       15 . The pair of dumbbells of  claim 13 , where each of the first engagement members has a generally elliptical shape and each of the second engagement members has a generally elliptical shape. 
   
   
       16 . The pair of dumbbells of  claim 12 , where each of the top surfaces and each of the bottom surfaces have a generally elliptical shape, and where each of the first engagement members is a generally elliptical protrusion having a generally flat face located at an approximate center of the top surface and each of the second engagement members is a generally elliptical recess having a generally flat base located at an approximate center of the bottom surface. 
   
   
       17 . The pair of dumbbells of  claim 12 , where each of the top surfaces and each of the bottom surfaces have a generally elliptical shape, and where each of the first engagement members is a generally elliptical protrusion having a generally convex face located at an approximate center of the top surface and each of the second engagement members is a generally elliptical recess having a generally concave base located at an approximate center of the bottom surface. 
   
   
       18 . A dumbbell comprising:
 two generally cylindrical weight members at either end of a handle, where each of the weight members comprises   a generally elliptical top surface with a generally elliptical first protrusion having a face and a sidewall located between the top surface and the face, the first protrusion located at an approximate center of the top surface, and   a generally elliptical bottom surface with a complementary generally elliptical second protrusion having a base and a sidewall located between the bottom surface and the base, the second protrusion located at an approximate center of the bottom surface, and   where the first protrusion accommodates and mates with a second protrusion of a second dumbbell.   
   
   
       19 . The dumbbell of  claim 17 , where the first protrusion has a generally convex face and the second protrusion has a generally concave base. 
   
   
       20 . The dumbbell of  claim 17 , where the first protrusion has a generally flat face and the second protrusion has a generally flat base.