| 摘要 |
An improved rosette for securing a disc having a central aperture includes a raised cylindrical hub projecting upward from a planar base, the hub being formed of first and second upstanding annular sections having substantially cylindrical side walls1, the first annular section comprising at least 180 DEG of the circumferential extent of the circular hub. Each of the annular sections includes at least one radially extending rim projecting outwardly beyond the cylindrical side walls. The second annular section cylindrical wall is positioned radially outwardly of the cylindrical wall of the first annular section and is supported on the base for allowing radially inward and downward pivoting of its cylindrical wall. An arm cantilevered from the cylindrical wall of the second annular section above the base extends radially inwardly toward the central axis of the hub such that downward finger pressure applied to the free end of the arm causes the cylindrical wall of the second annular section to pivot radially inwardly and downwardly to allow the central aperture of a disc mounted on the rosette to be released from engagement with the radially extending rims for one-handed removal of the disc from the rosette. Optionally, the rosette may include resilient ejection means to support a disc above the base when the disc is mounted on the rosette and to urge the disc off of the rosette when the disc is released from engagement with the radially extending rims. |
