| 摘要 |
An internally threaded fastener comprising a stud having internal threads, a stud hold-out ring, a grommet having a cylindrical surface of a first diameter, external slots formed in the surface and a retaining ring having inwardly extending projections adapted to slide within the grommet slots. An internal groove is formed in the grommet and a slotted snap ring is embedded in the groove. A receptacle having an externally threaded screw mounted therein is affixed to the substrucutre, or lower panel. The stud is mounted in the grommet and the assembly is then inserted through an aperture formed in the upper panel in a manner such that the receptacle screw engages the internal threads of the stud. The stud has two grooves formed thereon, the snap ring being forced into the first groove when the stud is threaded into the receptacle. The first groove includes an angled portion such that when the stud is being unscrewed, the snap ring is forced over the angled portion onto the smooth shank portion of the stud, the grommet being ejected from the substructure aperture. As the stud is unscrewed further, the snap ring moves along the shank portion until it snaps into the second groove, preventing disengagement of the stud from the grommet and maintaining the stud in the hold-out position.
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