Fastener insert with improved anti-rotation and pull-out charact

Details Fastener insert with improved anti-rotation and pull-out charact Fastener insert with improved anti-rotation and pull-out charact

1975-02-13

1977-02-15

Frazier, Roy D.

85 75, F16B 1310

Patent

active

040076598

ABSTRACT:
A blind fastener system comprising a ductile sleeve having an expansion portion of small inner diameter in a thin workpiece and having a bulbing portion of larger inner diameter extending on the blind side of the workpiece, and a threaded expander member having an expander portion for expanding the sleeve expansion portion and a head portion for bulbously deforming the sleeve bulbing portion, both actions occurring on axially pulling the expander member. The expander portion has a tapered, radiused leading end followed by a configured (splined, knurled, etc.) portion for the remainder of the active length. The protrusions of the configured portion leave a void volume between them and between the minor and major diameters of the protrusions, and the volume of the sleeve expansion portion between the small inner diameter and the projection of the large inner diameter is approximately 0.5 to 0.8 of the void volume of the configured portion. The protrusions have blunt outer surfaces. The expander member may be a nut, in which case the minor diameter of the protrusion is at least 1.23 times the major diameter of the internal threads of the expander member, which threads are inwardly of at least a portion of said protrusions. The length of the bulbing portion is approximately one-half the outer diameter thereof, while the large inner diameter is approximately nine-tenths of the outer diameter of the sleeve bulbing portion. The axial length of the sleeve expansion portion is at least equal to the thickness of the workpiece, and the expansion section of the expander member is at least equal to the axial length of the expansion portion of the sleeve.
The expander member may have internal threads, to serve as a nut, or may have a stem with external threads, to serve as a bolt or stud. The stud may receive an electrical connector, the fastener system being of suitable electrically conductive materials.

REFERENCES:
patent: 2409352 (1946-10-01), Gill
patent: 2803984 (1957-08-01), Swenson
patent: 3007364 (1961-11-01), Dickie
patent: 3110212 (1963-11-01), Wing et al.
patent: 3271058 (1966-09-01), Anderson
patent: 3292482 (1966-12-01), Fry et al.
patent: 3412639 (1968-11-01), Sauter
patent: 3477335 (1969-11-01), Gold et al.
patent: 3515419 (1970-06-01), Baugh
patent: 3683740 (1972-08-01), Martin

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