Self-contained blind bolt

Claim 1

A BLIND BOLT FOR CLAMPING TOGETHER TWO OR MORE STRUCTURAL PANELS HAVING CONCENTRIC OPENINGS THERETHROUGH, IRRESPECTIVE OF THE ACCESSIBILITY OF THE OPENING IN THE INNERMOST PANEL, THE BOLT BEING INSERTABLE AS A UNIT INTO SAID OPENINGS AND REMOVABLE AS A UNIT THEREFROM, AND COMPRISING: A SLEEVE COMPONENT EXTENDING THROUGH SAID OPENINGS AND CONSTITUTING A CENTERING SLEEVE FOR THE BOLT, SAID SLEEVE HAVING A FLANGED OUTER HEAD PORTION ENGAGEABLE WITH A SURFACE OF THE OUTERMOST PANEL, AND HAVING AN INWARDLY TAPERED SKIRT PORTION EXTENDING BEYOND THE INNERMOST SURFACE OF THE INNERMOST PANEL, AT ITS INNER END PORTION; SAID HEAD PORTION HAVING AN ANNULAR SOCKET THEREIN AND HAVING CIRCUMFERENTIALLY SPACED RECESSES IN ITS MARGIN FOR RECEIVING A HOLDING TOOL, AND THE BORE OF SAID SLEEVE BEING SCREW THREADED FROM SAID SOCKET INWARDLY THEREOF; A CENTER COMPONENT RECEIVABLE IN THE BORE OF SAID SLEEVE AND HAVING A FLANGED HEAD RECEIVABLE IN THE SLEEVE SOCKET AND A CYLINDRICAL SHANK PORTION, THE INNER PORTION OF SAID SHANK BEING SCREW THREADED, AND SAID HEAD HAVING CIRCUMFERENTIALLY SPACED RECESSES IN ITS MARGIN FOR RECEIVING A TORQUING TOOL; THE ANNULAR SOCKET OF SAID SLEEVE AND THE UNDERSIDE OF THE HEAD OF THE CENTER COMPONENT HAVING MUTUALLY ENGAGEABLE SERRATIONS FOR RESTRAINING LOOSENING OF THE BOLT UNDER VIBRATION WHEN IT IS TORQUED TO CLAMPING POSITION; A LIFTING COLLAR SLIDABLE OVER SAID SHANK PORTION AND KEYED THERETO AGAINST RELATIVE ROTATION THEREON, AT THE OUTER PORTION OF SAID SHANK FROM SAID HEAD PORTION INWARDLY, THE EXTERIOR OF THE COLLAR HAVING SCREW THREADS MATING WITH THE SCREW THREADS IN THE BORE OF SAID SLEEVE; AND A NUT COMPONENT HAVING A TUBULAR BODY SLIDABLE LONGITUDINALLY WITHIN THE INNER AND SKIRT PORTIONS OF SAID SLEEVE AND KEYED THERETO AGAINST RELATIVE ROTATION THEREIN, THE OUTER PORTION OF THE BORE OF SAID BODY HAVING SCREW THREADS MATING WITH THE SCREW THREADS OF SAID SHANK PORTION; SAID NUT COMPONENT HAVING AN EXTERIOR ANNULAR SOCKET AND A PAIR OF CONCENTRIC CLAMPING RINGS DISPOSED IN SAID SOCKET, EACH OF SAID RINGS HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED, UPSTANDING SPRING FINGERS, AND SAID RINGS BEING KEYED TOGETHER AGAINST RELATIVE ROTATION, WHEREBY THE FINGERS OF ONE RING ARE MAINTAINED IN STAGGERED RELATION TO THE FINGERS OF THE OTHER RING, SAID FINGERS BEING ADAPTED TO SLIDE OVER AND BE FLARED OUTWARDLY BY THE TAPERED SKIRT PORTION OF SAID SLEEVE AND TO ENGAGE THE INNERMOST PANEL, WHEN THE NUT COMPONENT IS MOVED TO CLAMPING POSITION BY ROTATION OF THE CENTER COMPONENT THEREIN.