Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1984-11-09
1987-01-27
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 43, 411 56, F16B 1304
Patent
active
046391746
ABSTRACT:
The rivet comprises a tubular body 12 having a shank 14 having a rivet head at one end and an end portion 32 of which is tapered externally and internally towards the other (tail) end 20. A stem 10, disposed in the bore 18 of the body, has a stem-tail 22 which projects from the head end and breaks off when the rivet is set, a plug 24 in the bore 18, and a terminal head 28 abutting the tail-end 20. The diameter of the plug is reduced progressively and stepwise towards the terminal head, providing an abutment 50 and an annular groove 29 between the terminal head 28 and the abutment 50. Material of the end portion 20 extends into the groove to maintain the body and stem assembled, and enters further into the groove during setting of the rivet.
The rivet is set by pulling the stem tail while supporting the body, causing the shank to collapse into a bulge which provides a blind head.
The external tapering of the portion 32 promotes bulging at a lower applied force than would otherwise be required. Loss of the plug is prevented by the abutting of body material in the groove against the abutment 50, assisted by friction between the body and splines 44 on the plug which embed in a locking region of the body during setting.
REFERENCES:
patent: Re20055 (1936-08-01), Huck
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patent: 2030168 (1936-02-01), Miller
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patent: 2061628 (1936-11-01), Huck
patent: 3149530 (1964-09-01), Koutc
patent: 3286580 (1966-11-01), Jeal
patent: 3414965 (1968-12-01), Stau et al.
patent: 3515419 (1970-06-01), Baugh
patent: 4189977 (1980-02-01), Hintz et al.
patent: 4222304 (1980-09-01), Yoshida et al.
Archer Stephen
Denham Keith
Avdel Limited
Holko Thomas J.
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