| 摘要 |
A gyroscopic wrist exerciser having a rotor on a shaft having two shaft ends; a guide ring accepting shaft ends in diametrically spaced notches formed within the inner periphery of the rotor, a housing made of a plastic upper shell and a plastic lower shell. The upper shell has an upper stepped joint engagable with a lower stepped joint of a lower shell to form a stepped joint union that forms an internal circumferential groove upon the internal periphery of the housing and an external circumferential groove upon the external equatorial periphery of the housing. The internal circumferential groove receives a guide ring. A rubber annular grip has an inner protrusion that is smaller than the external circumferential groove to allow a clearance. The rubber annular grip protects a stepped joint union located along the internal circumferential groove and the external circumferential groove from external impact. The rubber annular grip protects a user's hand.
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