Abstract: An improved structure of a foldable bike includes a turntable containing an upper bearing and a lower bearing provided between a crossbar and a head tube; a pair of recesses being provided in symmetry in the turntable to be fixed by a locking mechanism provided below the crossbar; a folding structure and an absorber being provided to a seat pole of the bike with the absorber being locked to a chain stay; the bike being ready for riding when the locking mechanism and the absorber being fixed in position; and when the locking mechanism and absorber being released, the bike being folded up with the seat pole as a support to facilitate handling or storage.

Abstract: A folding structure of a children tricycle is disclosed. The folding structure has a pivotal seat connected to a front and rear wheel rod. The fixing rods of the front and rear wheel allows the pivotal seat to rotate, wherein the rear wheel fixing rod is connected to a substantially “C”-shaped fixing seat and the through hole near to the top edge of the two wheel rods is pivotally connected to the fixing seat. The top of the wheel rod is provided with a resilient fastener such that the wheel rod can make use of the through hole as fulcrum to provide extending and folding. The fastener can engage at different fastening holes so that when in use, the wheel rod can be extended and when not in use, the wheel rod can be folded. Thus, the folding structure allows the tricycle to be retracted for storage and transportation.

Abstract: An improved structure of a bicycle for children is disclosed. The bicycle comprises a front and a rear frame and a flexural mechanism is used to connect the front and the rear frame such that the tricycle can be folded. The upper section of the front frame is extended with a foldable handle and the front frame is provided with a rotating shaft. The rotating shaft is connected to a control shaft disposed at the rear frame by means of a cable such that the tricycle can be control the front wheel to move left or right by controlling the left and right movement of the control shaft.