Method of making a self-locking blind fastener

Details Method of making a self-locking blind fastener Method of making a self-locking blind fastener

1985-02-22

1987-07-21

Combs, E. Michael

10 27PH, B21D 5324

Patent

active

046808230

ABSTRACT:
In a blind fastener (20) of the kind comprising a tubular nut (22) having a shank (28) with a head (30) at one end and a tapered nose (32) at the other end, a headed bolt (24) threadedly engaged in the bore (34) of the nut (22), and an expansible sleeve (26) which, by rotating the bolt (24), can be forced on to the nose (32) to form a blind head, a section of the shank (28) of the nut (22) is formed with a single protuberance (42) which protrudes resiliently into the bore (34) sufficiently to interfere with and restrain rotation of the bolt in the nut, and thus render the fastener self-locking. The shank (28) may have more than one section each provided with a single such protuberance (42), the effect of several protuberances being additive. Each protuberance (42) lies entirely within a minor sector of its section of the shank, and presents either a flat or a curved threaded surface traversed by the thread (38). Protuberances may be in different sectors if spaced longitudinally of the shank. Each protuberance is formed by impressing a minor zone of the external surface of the shank with a punch (74) while supporting a diametrically opposite zone in a nest (70) shaped so as to substantially preserve the cylindrical shape of the shank in the remaining major sector. A cap (16) is used in cooperation with the nest (70) to define an angled cavity (79) to restrain deformation and axial bending of the shank (28) during the impressing by the punch (74).

REFERENCES:
patent: 2286982 (1942-06-01), Todd
patent: 2754871 (1956-07-01), Stoll
patent: 3129630 (1964-04-01), Wing et al.
patent: 3391721 (1968-07-01), Rosan
patent: 3643544 (1972-02-01), Massa
patent: 4110858 (1978-09-01), Kerr
patent: 4335479 (1982-06-01), Copithorne

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