Combination key slot and retainer for blind bolt connections

Claim 1

A COMBINATION BOLT AND KEY SLOT APERTURE AND RETAINER FOR BLIND BOLT CONNECTIONS COMPRISING SHEET MATERIAL HAVING A FIRST ENLARGED APERTURE THEREIN, SAID APERTURE BEING OF GREATER WIDTH THAN LENGTH AND HAVING A SMALLER TAPERED APERTURE EXTENDING FROM THE CENTER OF SAID LENGTH OUTWARDLY THEREFROM, THE SIDES OF SAID TAPERED APERTURE FORMING A KEY SLOT FOR THE SQUARE SHANK OF SAID BOLT, THE MOUTH OF SAID APERTURE BEING WIDER THAN SAID SQUARE SHANK AND TAPERING TO A WIDTH LESS THAN THAT OF SAID SQUARE SHANK SO THAT SAID SQUARE SHANK IS EASILY RECEIVED AND WEDGED INTO POSITION BY SAID TAPERED APERTURE, A TONGUE OF SHEET MATERIAL EXTENDING DOWNWARDLY WITH A PORTION OF SAME IN SUBSTANTIAL PARALLEL ALIGNMENT WITH AND INTERGAL WITH AND DEPENDING FROM ONE SIDE OF SAID SHEET MATERIAL, SAID TONGUE POSITIONED BELOW SAID TAPERED APERTURE PROVIDING A RETAINER FOR SAID BOLT, SAID TONGUE OF METAL PROVIDING A SLOPED APERTURE IN SAID SHEET MATERIAL WHEREBY SAID BOLT MAY BE INSERTED IN SAID ENLARGED APERTURE WITH THE HEAD OF THE BOLT UNDERNEATH THE SIDES OF THE TAPERED APERTURE SO THAT THE SQUARE SHANK OF THE BOLT MAY CONTACT THE TAPERED SIDES OF THE LATTER APERTURE OF SAID KEY-HOLE SLOT WHEREBY IMPROVED RETAINING POWER IS PROVIDED BY SAID KEY-HOLE SLOT AND RETAINER.