Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc.
Patent
1997-11-11
1999-07-27
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
411186, F16B 3700
Patent
active
059279214
ABSTRACT:
An enhanced fatigue nut for mating with a threaded mating component includes an exterior surface, a flanged mating end for insertion of a threaded mating component and an end opposing the flanged mating end. Disposed on the interior of the fastener may be a plurality of threads running from the flanged mating end toward the opposing end. The flanged mating end may have a load distributing profile that reduces a limiting stress on the threads of the mating component when the mating component is mated with the enhanced fatigue nut. The flanged mating end may have an end surface, a portion of which is disposed at an angular relationship with a line that is disposed perpendicular with a line that is disposed through the center of the interior of the enhanced fatigue nut. This angled portion creates a gap between the enhanced fatigue nut and another component, such as a washer, so that when the enhanced fatigue nut is mated with the mating component, the enhanced fatigue nut can bend or deflect into the gap and thereby shift the loads on the mating component to reduce the peak limiting stress on the threads of the mating component. This thereby increases the fatigue life of the mating component. The enhanced fatigue nut may also have a groove disposed in the flanged mating end that cooperates with the angled portion of the flanged mating end to reduce the limiting stress on the threads of the mating component.
REFERENCES:
patent: Re26469 (1968-10-01), Beltoise
patent: 2959204 (1960-11-01), Rigot
patent: 3056443 (1962-10-01), Knocke
patent: 3933074 (1976-01-01), Witte et al.
patent: 4990044 (1991-02-01), Kimak
Bickford, J.H., "An Introduction to the Design and Behavior of Bolted Joints", Second Edition (Revised and Expanded), Marcel Dekker, Inc., 19-20 and 489-490.
Elastic Stop Nut Corporation of America, "Recent Technological Developments that Significantly Improve Faster Fatigue Performance", For High Tensile Fastening, 1962, No. 6226, Section II, 11-17 and 3 sheets of drawings.
Friesth, E.R., "Modern Metric Hardware-Simpler and Better", Assembly Eng., Oct. 1977, 36-40.
Kaynar.sub..RTM., Division of Kaynar Technologies, Inc., "Nut -12 Point, Self-Locking, High Fatigue", Feb. 1, 1995, 2 sheets of drawings.
National Aerospace Standard, Aerospace Association of America, Inc., 1997, NASM1312-11, 1 page.
Precision Fastener Division SPS, "The Asymmetric Thread: Key to greater bolt fatigue strength", Standard Pressed Steel Co., (Form 3228 667-25M-SPS), 1969, 1-7.
Spiralock.RTM. Fasteners, Microdot Aerospace Fastening Systems Group, "Technical Manual", 1991, (Form SP16B--Jul. 1991--10M), 1-17.
SpS Fastener Facts, Precision Fastener Division, "Why high-fatigue systems?", Standard Press Steel Co., 1967, Section V.C.1, (Form 3184-1 368-1M-SPS),10 pages.
SpS Fastener Facts, Aerospace Products Division, "Radiused Roots: the enemy of fatigue", Standard Pressed Steel Co., 1967, Section V.C.3, (Form 3184-3 670-1M-SPS), 2 pages.
Yakushev, A.I., "Effect of Manufacturing Technology and Basic Thread Parameters on the Strength of Threaded Connexions", The Macmillan Company, New York, 1964, 31 and 1 sheet of diagram.
Wiegand, H., "The Fatigue Strength of Screw Material and Threaded Connections", Tech. Publ. No. 14 of the firm of Bauer and Schaurte, Neuss, 1934.
Saether Flemming
SPS Technologies, Inc.
LandOfFree
Enhanced fatigue nut does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Enhanced fatigue nut, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enhanced fatigue nut will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-871085