| 摘要 |
A stud-like captive panel fastener which a rigid, continuous, retaining ring may be installed on or removed from without deformation of the ring and which will not accidentally become dislodged from the fastener under normal usage. The fastener is formed with an enlarged head, keyways extending intermediate the ends of the fastener, installation slots extending from the leading end of the fastener and parallel to the keyways, and cross-channels connecting the installation slots and the keyways. After the fastener is inserted through an opening in a panel, the fastener is captivated to the panel by a rigid, continuous retaining ring which is placed on the fastener by first entering the tabs of the ring in the installation slots and then rotating the ring in a bayonet manner within the cross-channels until the tabs enter the keyways. The retaining ring is prevented from backing off the fastener through retrograde movement by the cross-channels beng staggered relative to one another in one embodiment and/or a depressible wire spring member positioned in one of the installation slots in a second embodiment. The wire spring member also functions as a "hold out" for the fastener when the fastener is retracted.
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