Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1988-01-26
1990-04-24
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 43, F16B 1304
Patent
active
049195760
ABSTRACT:
A locking apparatus for blind fasteners providing improved yield and fatigue performance of the blind fasteners is disclosed. The locking apparatus utilizes a locking collar which will slide over the fastener stem and within the tubular rivet sleeve of the fastener without preforming into the locking groove on the stem. The locking collar is formed so that upon the pulling of the stem during installation of the blind fastener, specially formed tapered regions in the locking collar then adjacent the locking groove on the stem cause the region of the locking collar immediately thereabove to be encouraged tightly inward against the locking groove to provide a particularly tight fit in the locking groove. In an alternate embodiment, the locking collar is formed so that upon pulling of the stem during installation of the blind fastener, a specially formed locking collar buckles inward to pack tightly into the locking groove.
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Louw John A.
Luhm Ralph
Owens William H.
Allfast Fastening Systems, Inc.
Lindsey Rodney M.
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