Abstract: A socket is constructed in such a way that six pieces of segments which are made of electric conductive bar and having a regular hexagonal cross section are assembled by a centripetal force of a spring band to provide a regular hexagonal plug inserting hole in its center, and the six pieces of the segments make an independent operation without restricting other segments mutually and having the contact pressure and make a positive corresponding operation against the center offset and the error of the inserting angle of the plug when the plug is inserted and each segment applies the contact pressure simultaneously against the plug to maintain the complete contact with the plug.

Abstract: A button for clothes is composed of a button body and a reverse button having a needle member as a set. The button body is formed on its base plate center with an axial hole for insertion of the needle member of the reverse button. The inside of the button body is provided with an engaging means for firm engagement of the needle member of the reverse button inserted into the inside through the axial hole and a detaching means for release of engagement of the needle member that is engaged with the button body. The engaging means is formed by an engaging member provided with a ring portion to be retained between the base plate and an ornament member by means of a thin plate member. The ring portion is formed integrally with two pawl pieces which extend diametrically from the ring portion toward the center. Each of the pawl pieces is formed with a semi-circular notch at its respective ends whereby the notches form a circular hole that coincides with the axial hole of the base plate.