Nut and retainer with severable sleeve portion

Claim 1

IN A FASTENING DEVICE COMPRISING A SUBSTANTIALLY FLAT METAL BODY PORTION HAVING AN APERTURE THERETHROUGH, A SLEEVE PORTION PROJECTING OUTWARDLY FROM ONE SIDE OF SAID BODY PORTION AND BEING FORMED FROM THE MATERIAL OF SAID BODY PORTION AT SAID APERTURE, SAID SLEEVE PORTION COMPRISING AN INTEGRAL BASE SECTION HAVING MEANS THEREON WHICH OVERLAPS THE PERIPHERY OF SAID APERTURE, SAID BASE SECTION BEING INTEGRALLY CONNECTED TO SAID BODY PORTION ALONG A WEAKENED LINE OF CONNECTION ENCOMPASSING THE PERIPHERY OF SAID APERTURE IN JUXTAPOSED RELATION THERETO, A NUT MOUNTED IN SAID APERTURE, SAID NUT HAVING A SHANK, A BASE ON ONE END OF SAID SHANK EXTENDING TRANSVERSELY THEREOF, SAID BASE INCLUDING A RAISED SHOULDER FACING IN THE DIRECTION OF PROJECTION OF SAID SHANK, SAID SHANK BEING RECEIVED IN SAID SLEEVE PORTION WITH SAID SHOULDER BEING RECEIVED IN SAID APERTURE, SAID SLEEVE PORTION BEING ADAPTED TO BE SEVERED FROM SAID BODY PORTION ALONG SAID WEAKENED LINE OF CONNECTION UPON ON APPLICATION OF A PREDETERMINED PRESSURE BY SAID SHOULDER ON SAID NUT TO THE INTERIOR OF SAID SLEEVE PORTION APPLIED BY SAID NUT FROM THE OTHER SIDE OF SAID BODY PORTION, SAID OVERLAPPING MEANS BEING ADAPTED TO LIMIT AXIAL MOVEMENT OF THE SEVERED SLEEVE PORTION AND ASSOCIATED NUT FROM SAID ONE SIDE OF SAID BODY PORTION THROUGH SAID APERTURE TOWARD SAID OTHER SIDE OF SAID BODY PORTION, SAID BASE BEING ADAPTED TO LIMIT AXIAL MOVEMENT OF SAID NUT IN THE OTHER AXIAL DIRECTION AND MEANS ON SAID BODY PORTION AND ON SAID NUT FOR LIMITING RELATIVE ROTATIVE MOVEMENT BETWEEN SAID NUT AND SAID BODY PORTION.