Blind hole anchor nut fastener

Details Blind hole anchor nut fastener Blind hole anchor nut fastener

1982-12-13

1984-11-20

Holko, Thomas J.

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

Having separate expander means

Frangible member

411 49, F16B 1306

Patent

active

044836490

ABSTRACT:
A blind hole anchor nut fastener comprises a tubular sleeve and a screw-threaded nut at the end of the sleeve, so that when a screw-threaded mandrel is screw-engaged with the nut, and is displaced axially in the appropriate direction, the nut can shear from the sleeve and be drawn into the sleeve in wedging engagement. The basic nut shape is modified by making it non-circular such as trochoidal (for example) at one end and in so-doing making parts of the surface back-tapered so that in the displacement into the sleeve the non-circular shape helps in anti-rotational hold relative to the sleeve and the reduced volume resulting from the back-taper minimizes actual extension of the sleeve under the wedging action so as to reduce the possibility of the sleeve splitting.

REFERENCES:
patent: 2756624 (1956-07-01), Austin
patent: 2954718 (1960-10-01), Brilmyer
patent: 3279303 (1966-10-01), Shackelford
patent: 3311148 (1967-03-01), Leitner
patent: 3340762 (1967-09-01), Bennett
patent: 3411398 (1968-11-01), Blakeley
patent: 3493254 (1970-02-01), Summerlin

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