Self-ejecting fastener stud

Claim 1

In a self-locking quick acting fastener of the type having a receptacle and a stud interengageable therewith upon relative rotation, the improved self-ejecting fastener assembly comprising: a stud element having an enlarged head portion and a shank portion extending therefrom and having coupling means near its opposite end for locking interengagement with the receptacle, said head portion having a dependent peripheral flange forming an annular recess in the undersurface of the head; a collar member positioned on and slidable along the shank portion of the stud element and having a central opening through which the shank portion of the stud element extends and which has a configuration generally similar to but smaller than the combined cross-section of the shank portion and coupling means, said collar portion being made of resilient material so that distention of the material permits insertion of the coupling means and shank portion of the stud through the central opening but providing a frictional fit that will prevent accidental removal of the collar member therefrom, said collar member having an upstanding flange of the same diameter as the flange on the head portion of the stud element and in alignment therewith forming a recessed upper surface on the collar member; and a spring member surrounding the shank of the stud member and extending between the undersurface of the head portion and the collar member, to normally hold them in spaced relationship, but so as to permit the shank portion to be projected through the collar member so that the coupling means can be interengaged with the receptacle upon rotation of the stud member and so that the flange of the head portion of the stud element engages the flange of the collar member forming an enclosed recess with the spring being encased therein.