Abstract: An improved central speed control mechanism for remote control cars primarily comprises a housing and a cover, which are connectable to each other and are respectively provided with a pivot for connecting to the remote control car at one end and mounting helical gears at the other end. Inside of the housing is provided with a gear set, which comprises a positioning block, a plurality of bevel gears and axles. Axle holes are equally provided on the periphery of the positioning block, whereas a central hole with a cone surface is provided in the bevel gears for matching with the cone surface of the axle which is provided with a positioning pillar at the front end and a cone surface in the middle section. After the axle passes the end of the bevel gear provided with a O-ring through to the axle hole, and a washer is further provided at the rear of the axle to complete the assembly of the whole housing, the plurality of bevel gears of the gear set will engage with the helical gears of the two pivots.

Abstract: A tire-rimming device for a toy car is disclosed. The device comprises a base seat within a housing and a pressing frame, characterized in that the base seat is provided with a support frame, a rotating plate, a fastening seat and a switch, the center of the rotating plate is provided with a positioning shaft which is connected to a speed-reduction motor within the housing. The axle of the speed-reduction motor is engaged with that of the rotating plate, thereby when the tire is placed on the rotating plate, the pressing frame will press down and lock the tire in position. The protruded lug on the bottom edge of the pressing frame can separate the rim from the tire, so that when the power is on, the speed-reduction motor will be actuated to drive the rotating plate, and therefore ease applying the adhesive to the tire.

Abstract: An improvement of a reversing device for a remote-controlled vehicle is disclosed.