Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection – Frangible connection
Patent
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
VSI Corporation
Wilson Neill R.
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