Importance

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Abstract

A wrist exerciser includes a spherical hollow casing having a top opening and a bottom opening. A ring is received within the casing and substantially coincident with a great circle of the casing and concentric with and rotatable about a first axis of the casing. A rotor is received within the ring and rotatably supported on the ring, having a central bore coaxial with and rotatable about a second axis of the casing that is substantially normal to the first axis. The rotor has a circumferential groove formed on the outer surface thereof with light emitting diodes (LEDs) equally spaced therein. A magnet is also disposed in the groove. The central bore of the rotor is partitioned into chambers which cause sound during the rotation of the rotor. A generator includes a ring magnet fixed to the ring and coaxial with the second axis and two coils fixed to the rotor and corresponding to the ring magnet for generating electrical current to power the LEDs during the rotation of the rotor by cutting through magnetic line of force of the ring magnet. A counter is attached to the bottom opening of the casing, including a proximity detector actuateable by the magnet in the groove and a photo sensor actuateable by the light of the LEDs which respectively detect the rotations of the rotor at different speed ranges. A rope is windable around the groove via the top opening of the casing for driving the rotor to rotate.

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First Claim