Patent ID: 6568110
Filing Date: 2003-05-27
Classification: B60R,G09F

Abstract:
A nonrotating billboard of a rotation body, comprising:a housing attached to a center of a rotation body and rotated together with the rotation body; a billboard member which has a surface on which a billboard is formed and includes a weight member below the weight center and is installed in the housing based on a relative rotation method and maintains an upright state by the weight of the weight member; a cover which covers the billboard member in such a manner that a billboard is exposed to the outside and is contacted with the housing and protects the billboard member; and a friction prevention means for maintaining a free state of the billboard member from the housing in a nonrotating state by preventing the billboard member from being contacted with the housing, the friction prevention means including a plurality of magnetic strips which are attached to each surrounding portion of the housing, billboard member, and cover in such a manner that the same poles of the magnetic strips are opposite to each other for thereby generating a repulsive force with respect to each other, so that the billboard member does not contact the housing and cover.