Bolt with self-contained multi-part nut and centering sleeve

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 IN SAID OPENINGS AND REMOVABLE THEREFROM, AND COMPRISING: A RIGID CENTERING SLEEVE EXTENDING THROUGH SAID OPENINGS AND HAVING A FLANGED HEAD PORTION ENGAGEABLE WITH A SURFACE OF THE OUTERMOST PANEL, AND A CONTINOUS, CYLINDRICAL INTERIOR WALL PORTION PROVIDING A BEARING SURFACE; AN EXPANDABLE NUT COMPONENT ASSEMBLY COMPRISING AT LEAST THREE SEPARATE AND SEPARABLE COMPLEMENTAL SEGMENTS ROCKABLE ANGULARLY WITH RESPECT TO EACH OTHER IN PLANES RADIAL TO THE AXIS OF SAID SLEEVE, FROM MUTUALLY CONTRACTED, UNLOCKING POSITION TO MUTUALLY EXPANDED, LOCKING POSITION; AND RESILIENT MEANS ENCIRCLING SAID SEGMENTS, INTERMEDIATE THE ENDS THEREOF, FOR HOLDING THE SEGMENTS IN COOPERATIVE, MUTUALLY ABUTING RELATION AND FOR YIELDINGLY RESTRAINING ROCKING MOVEMENT THEREOF; EACH NUT SEGMENT HAVING A RIGID SHANK PORTION OF SUBSTANTIALLY ARCUATE CROSS-SECTION PROVIDED WITH A CURVED, SCREW-THREADED INNER SURFACE, AND AN OUTWARDLY PROJECTING CLAMPING HEAD PORTION ENGAGEABLE FLATWISE WITH A SURFACE OF THE INNERMOST PANEL WHEN