Thread forming fastener

Details Thread forming fastener Thread forming fastener

1982-06-07

1984-02-07

Holko, Thomas J.

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

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

F16B 2500

Patent

active

044300360

ABSTRACT:
A self-threading fastener has circumferentially spaced thread-forming lobes on its thread and with the thread depth at a maximum at the lobes and a minimum circumferentially between the lobes. A lobe in one turn is circumferentially offset from a lobe in an adjacent turn. The fastener is made on roll-threading dies each having grooves sinusoidally varying in depth frm a maximum at one region to a minimum at a second region. The spacing of the regions is equal to a fraction of the thread pitch multiplied by the cosecant of the thread helix angle.

REFERENCES:
patent: 2352982 (1944-07-01), Tomalis
patent: 3163196 (1964-12-01), Hanneman
patent: 3180202 (1965-04-01), Kahn
patent: 3195156 (1965-07-01), Phipard
patent: 3262473 (1964-03-01), Phipard
patent: 3377906 (1968-04-01), Phipard
patent: 3685328 (1972-08-01), Carpenter et al.
patent: 3772720 (1973-11-01), Yamamoto
patent: 3800585 (1974-04-01), Simmons et al.
patent: 3818749 (1974-06-01), Yankee et al.
patent: 3878759 (1975-04-01), Carlson
patent: 3918345 (1975-11-01), Phipard
patent: 3934444 (1976-01-01), Simons

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