Weight adjustable dumbbell
 A weight adjustable dumbbell including two spherical shells joined by a short bar, each spherical shell comprising two equal parts connected by a respective lock bolt, with circular cushion plates retained therebetween to hold any of a variety of counter weights, wherein the circular cushion plates have a center hole, through which the respective lock screw bolt is inserted, a plurality of projections spaced around a peripheral edge thereof at equal intervals extending out of the respective spherical shell for protecting the spherical shells against impact, and two annular grooves on two opposite sides around the border into which the peripheral edge of either semi-spherical shell of the respective spherical shell fits respectively. 
A A
A63B A63B
additional inventional
Ching-Yi
Chang