Non-removable structural fastener assembly

A fastener assembly permanently securing together a pair of mating panels having aligned apertures therethrough wherein one of said panels has a countersunk opening leading into the aperture therein comprising:

• a bolt extending through said aligned apertures having an enlarged head at one end disposed in said countersunk opening, a threaded shaft portion at the other end and an integral main body portion interconnecting the head and the shaft portion;
• a split ring bushing encircling said integral main body portion of said bolt disposed in the aperture in the other of said panels;
• a first nut having a main body portion with a threaded throughbore threadably mounted on said threaded shaft portion of said bolt, said first nut having thread deforming means associated with said nut disposed adjacent the threads of said threaded shaft portion, said first nut also being threaded on the exterior of the main body portion thereof;
• a second nut having a main body portion with a threaded throughbore threadably mounted on said threaded exterior of said first nut, said second nut having thread deforming means associated with said second nut disposed adjacent the threads of said threaded exterior of said first nut when said second nut is threadably mounted on the threaded exterior of said first nut;
• and
• cooperating means on said first nut and said bushing for expanding said bushing radially outwardly away from said shaft portion thereby filling the aperture in said panel on which said bushing is disposed when said first nut is threaded on said shaft portion.

A fastener assembly for permanently securing together a pair of mating panels having aligned apertures therethrough comprising:

• a bolt having an enlarged head at one end, a threaded shaft portion at the other end and an integral main body portion interconnecting the head and the shaft portion;
• a split ring bushing encircling said integral main body portion of said bolt;
• a first nut having a main body portion with a threaded throughbore threadably mounted on said threaded shaft portion of said bolt;
• a second nut having a main body portion and an integral extension portion, said main body portion of said second nut being mounted in the interior of said first nut with said extension portion extending outwardly from said first nut toward said bushing when said main body portion of said second nut is mounted in the interior of said first nut, said second nut being keyed to said first nut for rotation therewith and break away means associated with said first and second nut for breaking away said second nut from said first nut when a predetermined torque is placed thereon;
• and
• cooperating means on said first nut and said bushing for expanding said bushing radially outwardly away from said shaft portion thereby filling the aperture in said panel on which said bushing is disposed when said first nut is threaded on said shaft portion.

A fastener assembly for permanently securing together a pair of mating panels having aligned apertures therethrough wherein one of said panels has a countersunk opening leading into the aperture therein comprising:

• a bolt extending through said aligned aperture having an enlarged head at one end disposed in said countersunk opening, a threaded shaft portion at the other end and an integral main body portion interconnecting the head and the shaft portion;
• a split ring bushing encircling said integral main body portion of said bolt disposed in the aperture in the other of said panels;
• a first nut having a main body portion with a threaded throughbore threadably mounted on said threaded shaft portion of said bolt;
• a second nut having a main body portion and an integral extension portion, said main body portion of said second nut being mounted in the interior of said first nut with said extension portion extending outwardly from said first nut toward said bushing when said main body portion of said second nut is mounted in the interior of said first nut, said second nut being keyed to said first nut for rotation therewith and break away means associated with said first and second nut for breaking away said second nut from said first nut when a predetermined torque is placed thereon;
• and
• cooperating means on said second nut and said bushing for expanding said bushing radially outwardly away from said shaft portion thereby filling the aperture in said panel on which said bushing is disposed when said second nut is threaded on said shaft portion.