Abstract: Molded plastic yo-yo halves are connectible to each other by an axial having threaded ends that are adapted to threadably engage threaded inserts press fitted into a specially designed socket. The inserts are polygonal as are the sockets with the insertion end of the socket being provided with a shallow registration socket adapted to orient the threaded insert with respect to the socket. The yo-yo halves are molded separately and the inserts are press fitted into the sockets into a subsequent operation, resulting in manufacturing efficiencies as well as a strong properly aligned yo-yo construction.

Abstract: A yo-yo incorporates a construction that enables the gap between the yo-yo halves to be adjusted simply and quickly. The halves of the yo-yo are threadably mounted on the ends of the yo-yo axle. The yo-yo halves are biased apart axially to maintain firm frictional contact between the yo-yo halves and the axial. The gap may be adjusted simply by rotating the yo-yo halves with respect to each other. The inwardly facing surfaces of the yo-yo halves also incorporate angular relationships to facilitate yo-yo play.

Abstract: A metal yo-yo embodies a construction in which each of the halves of the yo-yo body is formed from a disc and a hub that are made separately and secured to each other in an integral structure. The discs can be die cut from sheet material and may be deformed about the peripheral margin to define a dished configuration. The hub is inserted into the center hole of the disc and the two are assembled together in a swaging operation that constricts the metal of the disc about a portion of the hub. A pair of such yo-yo halves are connected together by an axle assembly that includes a bearing to facilitate extended spin time for the yo-yo. The yo-yo construction and method of fabrication provides substantial economies in the manufacture of metal yo-yos. In another aspect of the disclosure, the inwardly facing surfaces of the yo-yo halves may be formed to define an annular recess that cooperates with the yo-yo string in a manner that affects retrieval of the yo-yo.