ALEXANDRIA, Va., June 9 -- United States Patent no. 12,285,974, issued on April 29, was assigned to KYUPLA Co. Ltd. (Kagoshima, Japan).
"Wheel unit and wheel-type mobile body" was invented by Toshiro Niihara (Kagoshima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wheel unit 1 is composed of a stopper portion 70 installed in a main body portion 20 and a stopped portion 14 installed in a wheel and tire assembly portion 10. The stopper portion 70 is an electromagnet. When a voltage is applied to the stopper portion 70 at the time of turning a power source on with an electrode terminal portion 50 nested in a main shaft portion 40 as a contact, the electromagnet generates a magnetic field and is magnet...