Patent attributes
A dumbbell has a grip rod and multiple counterweight blocks. The grip rod has two connection segments each having multiple baffles to define multiple connection recesses between the baffles. The counterweight blocks are engaged respectively with the connection recesses. Each counterweight block has a body and a buckle. The body has an engaging channel extending from a center to an edge of the body and being expandable. The engaging channel has an opening and two protrusions to form an engaging space for being mounted around one of the connection segments. The buckle has a first end and a second end. The first end is connected pivotally to the body and at a position on one of two sides of the engaging channel. The second end is connected detachably with the body at a position on the other one of the two sides of the engaging channel.
