Blind bolt fastener for low bearing strength materials

Details Blind bolt fastener for low bearing strength materials Blind bolt fastener for low bearing strength materials

1978-01-05

1980-05-20

Holko, Thomas J.

85 72, F16B 1306, F16B 1310

Patent

active

042033462

ABSTRACT:
A blind fastener has a nut with a threaded bore, a core bolt having external threads for receipt by the nut, and a sleeve for expansion by the head of the core bolt and a shoulder of the nut to form a blind side folded bulb against the backside sheet of a joint. A thin-walled, tapered section of the sleeve fits over a relieved section of the nut and bears against the shoulder of the nut. The taper is such that the thin wall increases in thickness away from the shoulder. An axially adjacent thick-walled section of the sleeve bears on the core bolt head and resists sleeve tuck-out over the core bolt head, concentrically aligns the sleeve on the core bolt, and assures that the thin-walled section of the sleeve is the section that bulbs. During setting, the sleeve expands by compression exerted on it by the core bolt head and the shoulder. The thin wall section folds against the backside sheet with an ever-increasing area as tightening continues. The fold always develops against the backside sheet because the portion of the sleeve free of the sheet is weakest in compression there. Axial clamp-up force is spread over a large area of the sheet but unit loading is low.

REFERENCES:
patent: 2030167 (1936-02-01), Miller
patent: 2562019 (1951-07-01), Collet
patent: 2887003 (1959-05-01), Brilmeyer
patent: 3236143 (1966-02-01), Wing
patent: 3262353 (1966-07-01), Waeltz et al.
patent: 3277771 (1966-10-01), Reynolds
patent: 3369442 (1968-02-01), Darby et al.
patent: 3443474 (1969-05-01), Blakeley et al.
patent: 3461771 (1969-08-01), Briles
patent: 4007659 (1977-02-01), Stencel
patent: 4033222 (1977-07-01), Wilson
patent: 4089247 (1978-05-01), Dahl et al.

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