Abstract: The present invention teaches an environmentally friendly and convenient way of electricity generation. The electricity generation device contains a rotational arm, a weight, and a moving mechanism. The rotational arm is rotatably joined to an electricity generation mechanism and configured with a track element along its length. The weight is movably configured in the track element. The moving mechanism applies a first moving force to move the weight from a first end side of the rotational arm along the track element's length to a second end side opposite to the first end side. A torque is thereby produced to turn the rotational arm and electricity is generated from the electricity generation mechanism.

Abstract: A steering safety mechanism is provided for a bicycle and includes a frame, a steering stem, at least one first fastener, at least one second fastener, and a damping element. The frame includes a head tube portion. An end of the steering stem is received through the head tube portion. The first fastener is attached to the frame, and the second fastener is attached to the steering stem. The damping element has a first end attached to the first fastener and a second end attached to the second fastener.

Abstract: A structure of an automatic speed change device for bicycle gearbox is disclosed in this present invention. The above-mentioned design can be applied to a bicycle with a rear wheel speed change device. According to this invention, the automatic speed change device is able to control the allotting device of the rear wheel speed change device to transfer the chain into suitable gear by the treading rat of the user. This design can simplify the manual gear shifting process in the prior art for controlling the rear wheel speed change device. Therefore, this invention can make riding bicycle more easily and widely for all age.

Abstract: A structure of an automatic speed change device for bicycle gearbox is disclosed in this present invention. The above-mentioned design can be applied to a bicycle with a rear wheel speed change device. According to this invention, the automatic speed change device is able to control the allotting device of the rear wheel speed change device to transfer the chain into suitable gear by the treading rat of the user. This design can simplify the manual gear shifting process in the prior art for controlling the rear wheel speed change device. Therefore, this invention can make riding bicycle more easily and widely for all age.