Flush break blind bolt

Details Flush break blind bolt Flush break blind bolt

1985-04-12

1988-06-21

Smith, Gary L.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having separate expander means

Frangible member

411 54, F16B 1304

Patent

active

047521694

ABSTRACT:
A blind fastener comprising:
a nut with an axial bore therethrough, a bolt extending through the nut with a sleeve encircling the bolt between the head of the bolt and the nut body, and a stop ring provided on a screw threaded portion of the bolt, the bolt having a break groove therein, between the nut body and the bolt head. As the bolt is advanced upwardly during installation, the stop ring abuts the terminal end of the nut body. This sudden resistance to further travel causes the screw threaded portion to fracture at the break groove thus providing a clean break at the break groove substantially filling a cavity in the nut head thereby increasing the strength of the installed fastener and eliminating any need for shaving off the broken-off screw threaded portion.

REFERENCES:
patent: Re20055 (1936-08-01), Huck
patent: 2061629 (1936-11-01), Huck
patent: 3222977 (1965-12-01), Vaughn
patent: 3262353 (1966-07-01), Waeltz
patent: 3348444 (1967-10-01), Brignola
patent: 3657955 (1972-04-01), McKay
patent: 4312613 (1982-01-01), Binns
patent: 4376604 (1983-03-01), Pratt
patent: 4579491 (1986-04-01), Kull

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