Collapsible self-anchoring device

Claim 1

A SELF-ANCHORING FASTENING DEVICE FABRICATED OF A SUBSTANTIALLY RESILIENT PLASTIC MATERIAL COMPRISING: (A) A SUBSTANTIALLY ANNULAR HEAD PORTION HAVING AN AXIALLY EXTENDING BORE THERETHROUGH; (B) A SUBSTANTIALLY ANNULAR BODY PORTION HAVING AN AXIALLY EXTENDING BORE THERETHROUGH; SAID BORE BEING IN ALIGNMENT WITH THE BORE OF SAID HEAD PORTION AND GENERALLY NARROWER THAN THE BORE THROUGH SAID HEAD PORTION; (C) A PAIR OF OUTER RIB MEMBERS INTEGRALLY FORMED WITH SAID HEAD PORTION AT ONE END THEREOF AND WITH SAID BODY PORTION AT THE OTHER END THEREOF; (D) A PAIR OF INNER RIB MEMBERS INTEGRALLY FORMED WITH SAID HEAD PORTION AT ONE END THEREOF AND WITH SAID BODY PORTION AT THE OTHER END THEREOF, SAID OUTER AND INNER RIB MEMBER BEING IN OVERLYING SPACED JUXTAPOSED RELATIONSHIP; (E) A PROTUBERANCE ON EACH OF SAID INNER RIB MEMBERS ALONG THE INNER SURFACE THEREOF; (F) SAID INNER RIB MEMBERS EXTENDING FROM SAID HEAD PORTION AT THE FORWARD END THEREOF TO SAID BODY PORTION MEDIALLY THEREALONG TO FORM A SHANK PORTION IN SAID BODY PORTION, SAID SHANK PORTION BEING DIMENSIONED IN RELATION TO AND IN COOPERATION WITH SAID PROTUBERANCES TO BE SEATED UPON AND LOCKED AGAINST SAID HEAD PORTION; AND (G) A CENTRAL ORIFICE FORM BETWEEN SAID HEAD PORTION AND SAID BODY PORTION WHEREBY SAID SHANK PORTION IS SEATED UPON THE FORWARD END OF SAID HEAD PORTION AND SAID INNER AND OUTER RIBS ARE OUTWARDLY FLARED UPON THE APPLICATION OF COMPRESSION UPON SAID FASTENING DEVICE.