1976-09-29
1977-09-20
Britts, Ramon S.
29446, 29523, 85 1R, F16B 1306
Patent
active
040488985
ABSTRACT:
A fastener, primarily of the precision type for aircraft use in holding together multiple metal stack-ups, makes use of a sleeve, a headed shaft and a nut. The shaft and sleeve as a subassembly is inserted in a hole in a stack-up of sheets, the nut is applied to the shaft and the shaft is drawn forceably into the passageway to expand the sleeve laterally into anchored engagement with the wall of the hole. The fastener is of special construction in that it is an installation formed fastener and sleeve assembly for fatigue critical aircraft structure where the combination of sheet, plate, forgings and other fastener assembly materials may vary in modulus of elasticity, hardness and other physical properties. The fastener assembly consists of a sleeve, a bolt, rivet or stud, and suitable means of retention such as a self locking nut or collar. The sleeve is partially formed and machined to final dimension while in place on the exact bolt which is ultimately used when completing the fastener assembly in place. A pre-designed and predictable assembly sizing and forming takes place by reason of elastic and plastic material flow between the fastener assembly and hole provided in the stack-up sheets of the aircraft structure, during final installation, to substantially eliminate any existing clearances. With the above described system it is possible to guarantee a specified degree of hole expansion within close limits when the bore diameter tolerance of the aircraft manufacture is known.
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Briles Paul R.
Britts Ramon S.
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