Bifunctional roller skate has two wheel axles comprised of rods each engaged with roller that is abutted to knob before rod is inserted into through hole and attached with another roller on exposed end

摘要

The two wheel axles (40) are comprised of rods (41) sized to match the respective width of the front and rear end portions of a shoe (10). Each rod is provided on one end with a knob (43) and on the other end with an internally threaded hole (43). A roller (60) is engaged to each rod and abutted to the knob. The rod is guided into a through hole (11) and another roller is attached to the rod's exposed end.