Joints and connections – Interfitted members with external bridging piece
Patent
1978-07-31
1980-10-28
Britts, Ramon S.
Joints and connections
Interfitted members with external bridging piece
403388, F16B 502, F16B 3504
Patent
active
042300169
ABSTRACT:
An improved interference fit, fatigue-rated pin-type, nondeformable fastener and joints formed thereby are disclosed in countersunk flush head and protruding flat head embodiments, each characterized by a straight interference fit shank with a lead-in convex shoulder adjacent its threaded end operable to cold work the wall material of the straight fastener hole during fastener insertion, and with the shank progressively expanded in a concave curvilinear profile to its head end starting at a location preferably intermediate the ends of the shank. Curvature of the expansion profile fairs smoothly at relatively large radius into the straight intermediate portion of the shank. At its opposite end, the expansion profile curvature merges into a relatively sharp curvature of very small radius (i.e., of the order of 1% of the first and larger radius) that fairs smoothly into the lower face of the fastener head. Fatigue failures and corrosion problems in the fastener hole wall material starting at the hole entrance, and in some instances problems with warpage of a structural member caused by fastener installation are substantially avoided by the improved fastener.
REFERENCES:
patent: 2018913 (1935-10-01), Cautley
patent: 3561102 (1971-02-01), Diemer
patent: 3680429 (1972-08-01), Briles
patent: 3747467 (1973-07-01), Rosman
patent: 3748948 (1973-07-01), Schmitt
patent: 3779127 (1973-12-01), Speakman
patent: 3821871 (1974-07-01), Schmitt
patent: 3828422 (1974-08-01), Schmitt
patent: 3840980 (1974-10-01), Auriol
patent: 4050833 (1977-09-01), Briles
patent: 4111580 (1978-09-01), Falcioni
Britts Ramon S.
The Boeing Company
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