Self-locking fastener

Details Self-locking fastener Self-locking fastener

1990-09-27

1991-10-29

Wilson, Neill R.

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

Torque responsive nut or bolt driving connection

Frangible connection

411278, 411421, 4119372, F16B 3100, F16B 3504

Patent

active

050611321

ABSTRACT:
A self-locking fastener system comprises a pin for receipt in a hole in a workpiece and having an external thread which mates with a collar having an internal thread for carrying a tensile load. A plurality of helically extending flutes in the external thread on the pin collectively extend approximately one full revolution around the circumference of the thread. The collar has three longitudinally extending lobes for driving by a deltoid driver socket. When a desired clamp-up load is achieved on a workpiece, the socket plastically deforms the lobes and collar material radially inwardly thereof so that some of the collar material inwardly from each lobe is displaced into the void volume created by a helical flute. This displaced collar material inhibits unscrewing of the collar from the pin.

REFERENCES:
patent: 4260005 (1981-04-01), Stencel
patent: 4544312 (1985-10-01), Stencel
patent: 4682520 (1987-07-01), Gray

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