Abstract: Disclosed is a core for a current transformer, which forms an upper core in a round shape, and is disposed at a position lower than the center of a power line having both ends of the upper core received, thereby minimizing the stress of a magnetic path, and increases the permeability, thereby enhancing the magnetic induction efficiency. The disclosed core for the current transformer includes an upper core curved in a semi-circular shape to have a receiving groove formed therein, and having both ends extended downwards to be disposed to be spaced apart from each other and a lower core disposed on the lower portion of the upper core, and having both ends extended upwards to be disposed to face both ends of the upper core.

Abstract: The present invention relates to a foldable kick board in which a footboard can be folded in two stages and the length of a handle shaft can be freely adjusted such that the size of the full-folded kick board can be reduced to be same as the length of the footboard.

Abstract: The present invention relates to a foldable kick board in which a footboard can be folded in two stages and the length of a handle shaft can be freely adjusted such that the size of the full-folded kick board can be reduced to be same as the length of the footboard.

Abstract: A slider is provided which can travel ahead by placing a user's foot on a board and stamping the ground with the other foot like a known kick board or which can exercise a user by causing shafts each having a rear board fixed thereto to sufficiently extend backward and moving the shafts at symmetric angles relative to each other and can spontaneously travel ahead by means of waveform-like actions using rear casters attached to the bottoms of the rear boards.