Beaded fastener device

Claim 1

A BEADED FASTENING DEVICE FOR SECURING THE EDGE PORTIONS OF A SHEET OF THIN FLEXIBLE MATERIAL ABOUT A SURFACE AREA, COMPRISING: AN ELONGATED BEADED STRIP OF SUBSTANTIALLY RIGID MATERIAL HAVING A FOOT PORTION THEREALONG ADAPTED TO BE SECURED ALONG THE OUTSIDE EDGE OF THE AREA, THE STRIP HAVING A BEAD PORTION OF GENERALLY SPIRAL EXTERNAL CONFIGURATION OVERLYING THE INNER SIDE OF THE FOOT PORTION, THE BEAD PORTION BEING ADAPTED TO HAVE THE EDGE PORTION OF THE SHEET MATERIAL WRAPPED THEREAROUND SO AS TO EXTEND SUBSTANTIALLY TANGENTIALLY THEREFROM, AND THE STRIP PORTION HAVING A NECK PORTION CONNECTING THE BEAD AND FOOT PORTIONS, AND AN ELONGATED SEMI-TUBULAR RETAINER OF RESILIENT MATERIAL NORMALLY CONFORMING INTERIORLY TO THE EXTERIOR CROSS-SECTIONAL SHAPE OF THE BEAD PORTION, THE RETAINER BEING ADAPTED TO BE SNAPPED OVER THE BEAD PORTION AND THEREBY CLAMPING THE EDGE PORTION OF THE SHEET MATERIAL AGAINST THE BEAD PORTION, THE RETAINER EXTENDING MORE THAN 180* AROUND THE BEAD PORTION.