Yo=yo (TRM) for performing tricks during play

摘要

The yo-yo (TRM) consists of two shell discs (1,2) with hubs (17,18) which are screwed onto the ends of a shaft (5). The hubs have large threaded blind holes (6,7) into which inserts (3,4) are screwed. The inserts are fitted over the shaft and have protruding rims with which they clamp the inner ring (28) of a ball bearing which is mounted on the shaft. The gap between the discs can be adjusted by altering the depth by which the inserts are screwed into the hubs. The string used for operating the yo-yo fits on or over the outer ring (29) of the ball bearing.