Patent ID: 8424174

Claim:
A fastener for ornament comprising: a housing including an upper housing member having a pin passing hole for entry and exit of a pin in an ornament, and lower housing member having an opening portion provided at a position directly opposite to the pin passing hole; a guide of frustoconical shape having a small diameter portion and a large diameter portion, the guide being entirely housed in the upper housing member and supported on an end of the lower housing member; a movable operating body having a cylindrical inner member including a pin introducing passage, through which the pin is introduced via a pin introducing hole facing the pin passing hole, and a small ball holder portion of frustoconical shape having an outer peripheral surface contacting an inner peripheral surface of the guide and including a small diameter portion and a large diameter portion, and outer pipe member fixed to an outer side of the cylindrical inner member and including a cylindrical column portion fixed to the cylindrical inner member and a grip member continuous to the cylindrical column portion; a coil spring pressingly urging the movable operating body in a direction of the pin passing hole, the coil spring being arranged on a circumferential side of the outer pipe member of the movable operating body, the coil spring having a frustoconical shape having a small diameter portion at the pin passing hole side and having a large diameter portion at the opening portion side; the guide having a small diameter portion side of the frustoconical shape positioned at the pin passing hole side; the cylindrical inner member of the movable operating body having the small diameter portion of the frustoconical shape of the small ball holder portion positioned at the pin passing hole side; the outer pipe member of the movable operating body having one end side of the cylindrical column portion latched to the opening portion of the lower housing member and having the grip member disposed so as to protrude from the lower housing member to an exterior of a case; a frustoconical inner peripheral surface of the guide and a frustoconical outer peripheral surface of the small ball holder portion being in contact while having a same taper angle in a range of 10 to 20 degrees with respect to a central axis of the guide and a central axis of the small ball holder portion; the small ball holder portion is being arranged from three small balls disposed in positional relationship of opposing each other, and an embracing portion housing the three small balls; and the respective small balls being housed in the embracing portion in a manner such that the small balls, which are pushed in toward an axial center when one side spherical surfaces of the respective small balls positioned at the outer peripheral surface side of the small ball holder portion pressure contact the inner peripheral surface of the guide, clamp the pin as a whole by pressure contact by other side spherical surfaces of the respective small balls at positions of directly facing the pin.