Method for making a nut for a blind fastener

Details Method for making a nut for a blind fastener Method for making a nut for a blind fastener

1982-11-17

1986-05-20

Combs, E. Michael

B21D 5324

Patent

active

045891559

ABSTRACT:
A three piece blind fastener of the kind comprising a tubular nut having a head at one end and a tapered nose at the other end, an expansible sleeve, and a headed bolt threadedly engaged with the nut for forcing the sleeve on to the nose of the nut to form a blind head, has the thread of the nut provided with a locking zone in which the bore of the nut is constricted and, in cross sectional shape, a closed non-reentrant non-circular curve so that the nut resiliently interferes with the bolt.
A die, and a method of providing the nut with the locking zone by means of the die are disclosed. The die has a tapered aperture having a cross sectional shape corresponding to the desired shape of the locking zone, and the method involves forcing the tapered nose of the nut into the aperture so as to constrict the bore, in a zone spaced from its ends, to the desired extent and impose the non-circular cross sectional shape on the constricted zone.

REFERENCES:
patent: 332540 (1885-12-01), Law
patent: 3245096 (1966-04-01), McKay et al.
patent: 3295580 (1967-01-01), Waltermire
patent: 3461470 (1969-08-01), Cochrum
patent: 3643544 (1972-02-01), Massa
patent: 4352219 (1982-10-01), McMurray et al.

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