Abstract: A scooter structure having both decorative and toy performance that is comprised of a scooter body and a gyration force gear unit fastened to the lower end of the body. The body has a lateral retaining edge extending downward from each of the two sides of its bottom end and, furthermore, an access opening is formed in the lateral retaining edge to accommodate the insertion and positioning of the gyration force gear unit. A mortise is formed in each of the two sides of the holding section of a carrier mount such that a corresponding tenon formed on each of the two sides of the gyration force mount can be inserted and positioned. Turning wheels at the two sides of the gyration force mount are positionally fixed over the holding section and, furthermore, a space is left between each turning wheel and lateral end of the holding section that prevents the lock-up of the gyration force mount and the carrier mount during the execution of turns that would adversely affect the coasting of the toy scooter.

Abstract: An improved rear hub structure for bicycles includes a rear hub housing and a driving device. The driving device has a securing seat, multiple spring elements, multiple stop elements and a gear seat. The securing seat has a stem projecting from one end thereof. An iron washer with an embossed surface is disposed between the stem of the securing seat and a threaded slot of a through hole defined in the rear hub housing. The embossed surface of the iron washer contacts the threaded slot to prevent relative rotation. The stem of the securing seat has inner threads for engaging outer threads of a threaded rod. The threaded rod and the securing seat are locked together to prevent the securing seat from moving further toward the threaded slot of the through hole when the rear hub housing rotates forwardly. The iron washer prevents the stem of the securing seat from directly pressing against the rear hub housing and thus prevents it from deforming.