Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Frangible member
Patent
1993-10-05
1995-01-03
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Frangible member
411 70, 295252, F16B 1304, F16B 1306
Patent
active
053780981
ABSTRACT:
A blind fastener designed to secure workpieces having aligned holes therein is provided. The fastener comprises an elongated stem having a head at one end and a serrated tail at the other, and a tubular sleeve having a head through which tail of the stem extends and a tail which is engaged by the head of the stem. The stem further includes a shear ring for bulbing the sleeve tail and a lock ring groove for receiving a lock ring for locking the stem to the sleeve. The stem also has a shoulder which engages shoulder portion in the sleeve to cause the sleeve to expand radially outward so as to fill any clearance or gap between the sleeve and the workpieces. A reservoir located in the stem accepts excess shoulder material displaced during the hole filling process. In one embodiment, a preformed lock ring is positioned in the lock ring groove to lock the stem to the sleeve. In another embodiment, a lock ring is formed from material in the sleeve head.
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Andrews George A.
Eshraghi Soheil
Pratt John D.
Textron Inc.
Wilson Neill R.
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