Abstract: The invention relates to a method and device for generating electric power by use of wave force.According to the invention, it is possiblke to obtain the required power using the floatation bladders rising and falling repeatedly with waves as a power using the floatation bladders rising and falling repeatedly with waves as a power source and the rotation force of gears connected to the floatation bladders through ropes. The invention has advantages in that the construction of the power generating means and its supporting means are simple, execution of work is easy, a kinetic energy is convertable into an electric energy using the floatation bladders regardless of the magnitude of waves, and even in the deep sea, the base frame is not installed on the sea bed, but in a fixed depth under the mean sea level, and thereby the maintenance and repair of device is carried out without any difficulty.

Abstract: This invention pertains to a roller skate with a bottom plate for supporting a shoe. The skate has two upper frames extending in the longitudinal direction under the bottom plate. The upper frames are parallel to each other and each house three bearing boxes that carry clamping pads for mounting three roller shafts.