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1. A skateboard capable of providing a self-propulsive force, the skateboard comprising:
a board main body on which a user stands with his or her feet, wherein an installation recess having a certain depth is formed in a center portion, and guide holes are formed, with the installation recess being interposed between the guide holes; a center rotation portion which allows the user of the skateboard to change a direction of the skateboard with one foot put thereon, the center rotation portion including:
a rotation plate which is installed in the installation recess of the board main body;a support member in which thrust bearings are installed on upper and lower sides of a center portion thereof, and hollow wing portions are integrally formed in both left and right end portions thereof; anda bolt member which passes through the rotation plate and the support member and is fastened to a nut member; a first footrest portion which is provided on one side of the board main body with respect to the center portion and moves the board main body through a left and right reciprocating movement of the footrest, the first footrest portion including:
a footrest which is installed in the guide hole on one side of the board main body;a support member in which thrust bearings are installed in upper and lower side of a center portion thereof, and hollow wing portions are integrally formed in both left and right end portions thereof;a bolt member which passes through the footrest and the support member and is fastened to a nut member; anda wheel assembly in which a horizontal extension portion in an upper portion is fastened to a lower surface of the support member and wheels are pivotally provided in both left and right end portions of the main body integrally formed with the horizontal extension portion; a second footrest portion which is provided on the other side of the board main body with respect to the center portion and moves the board main body through a left/right reciprocating movement of the footrest, the second footrest portion including:
a footrest which is installed in the guide hole on the other side of the board main body;a support member in which thrust bearings are installed in upper and lower sides of a center portion thereof and hollow wing portions are integrally formed in both left and right end portions thereof;a bolt member which passes through the footrest and the support member and is fastened to a nut member; anda wheel assembly in which a horizontal extension portion in an upper portion is fastened to a lower surface of the support member, and wheels are pivotally provided in both left and right end portions of the main body integrally formed with the horizontal extension portion; and an elastic guide portion which is provided between the board main body and the wheel assemblies and guides left/right reciprocating movements of the support members. |
