Patent ID: 7448934
Filing Date: 2008-11-11
Classification: A63H

Abstract:
1. A yo-yo comprising: first and second side portions secured together in a spaced-apart relation by an axle structure; a tether operatively connected to said axle structure; wherein said first side portion comprises a body member, a plurality of permanent magnets fixedly secured to said body member, and a board member, wherein said permanent magnets are spaced apart from each other; wherein said board member is rotatably secured to said yo-yo in a manner whereby said board member is freely rotatable relative to said body member, wherein a sensor capable of detecting a magnetic field is secured to a first portion of said board member, wherein an electromagnet is secured to a second portion of said board member, and wherein an electrical power source is operatively connected to said sensor and to said electromagnet in a manner whereby it can provide electrical power to said sensor and to said electromagnet; and wherein when said first side portion is spinning and there is relative movement between said body member and said board member, whenever a first one of said permanent magnets passes by said sensor, said sensor will cause said electromagnet to become temporarily energized whereby said electromagnet will apply a force to another of said permanent magnets in a manner whereby said force tries to at least maintain a rotational momentum of said first side portion.