Abstract: A power generation system includes a base, a loading driving unit, and an adjusting unit. The base includes a sidewall. The load driving unit includes a platform, a first gear, a second gear, a roller, a motor, a first connection member and a second connection member. One end of the platform of the load driving unit is pivotally connected with the sidewall of the base. A heavy load is disposed on the platform. The loading driving unit applies a force on the first gear and then generates a moment of force to the second gear. A kinetic energy output from the motor is transferred from the first gear to the second gear. Due to the kinetic energy and the moment of force, the second gear has an output power greater than the input power that is transferred from the motor.

Abstract: An angle adjustment device for a vehicle rear view mirror is capable of improving the angle-adjustment capability of the movable board while preventing shaking of the movable board with respect to the fixing seat assembly, thus improving safe driving. The angle adjustment device comprises: a fixing seat assembly, a movable board, two arc-shaped racks and two driving units. The movable board and the arc-shaped racks are designed to be movable along the circle path around the center of the pivot connecting portion of the movable board, so that the angle-adjustment capability of the movable board can be improved.

Abstract: A gravitational electric power generating device includes a driving shaft, at least a spinning wheel, and two mount assemblies, in which each of the spinning wheels includes a first spoke rim, a second spoke rim, a wheel hub, and at least a tread-wheel. The two mount assemblies are erected at the two ends of the driving shaft, respectively, and can support both the driving shaft and the spinning wheel on the driving shaft. Using a moving object to move in the tread-wheel, and making use of the gravitational effect of the moving object, the spinning wheel is able to drive the driving shaft to rotate. The mount assemblies have a power conversion module, which is connected to an electric generator. The rotational inertia of the driving shaft is transmitted to the electric generator to generate the electric power using the power conversion module.