Patent ID: 6942601
Filing Date: 2005-09-13
Classification: A63B

Abstract:
1. In a wrist exercise comprising a casing defining an interior space rotatably receiving a rotor, the casing comprising: an upper casing member having a first mating edge on which first mating means is formed; a lower casing member having a second mating edge on which second mating means is formed to mate the first mating means for attaching the lower casing member to the upper casing member whereby a circumferential groove is defined between the first and second mating edges, the first mating means including a flange extending along the first mating edge and having an outward-facing surface on which a first threading is formed, the second mating means including a flange extending along the second mating edge and having an inward-facing surface on which a second threading is formed, the first and second threading engaging each other to secure the upper and lower casing member together; and a first retention ring at least partially fit over the upper and lower casing member, the first retention ring having an inwardly-projecting portion fit into the groove.