Controlled expansion protruding-head rivet design and method of

Details Controlled expansion protruding-head rivet design and method of Controlled expansion protruding-head rivet design and method of

1984-10-04

1987-07-21

Smith, Gary L.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element

Having plastically flowable or deflectable end, e.g., rivet,...

411506, F16B 1906

Patent

active

046814990

ABSTRACT:
The invention is a protruding-head rivet for joining two or more structural elements together which, when driven, using all standard driving tools, provide a controlled expansion of the hole. The protruding-head rivet 10 has a shank 12 having a nominal diameter 18. The head diameter 24 is between 1.642 times the minimum shank diameter 18 and 1.706 times the maximum shank diameter. The head has a center spherical radius 26 of between 1.320 times the minimum shank diameter and 1.406 times the maximum shank diameter and a head outer spherical radius 30 of between 0.321 times the minimum shank diameter 18 and 0.353 times the maximum shank diameter. The underhead surface downward directed angle 36 is between 5 and 6 degrees. The head height 22 is between 0.455 times the minimum shank diameter 18 and 0.479 times the maximum shank diameter.
The radius 38 between the protruding head and the shank is between 0.050 times the minimum shank diameter and 0.100 times the maximum shank diameter and the shank's tail end has a spherical radius which is between 0.365 times the minimum shank diameter 18 and 0.307 times the maximum shank diameter and tangent thereto when perpendicular to the longitudinal axis 11 of shank rivet located by a dimension 44 from the end of the shank 12 of between 0.312 times the minimum shank diameter 18 and 0.255 times the maximum shank diameter.

REFERENCES:
patent: 221447 (1979-11-01), Cornell
patent: 1966401 (1934-07-01), Andren
patent: 3561102 (1971-02-01), Diemer
patent: 3747467 (1973-07-01), Rosman
patent: 3821871 (1974-07-01), Schmitt
patent: 4004484 (1977-01-01), Speakman
patent: 4230016 (1980-10-01), Merrell
"The Real Strength of Rivets", Fasteners, Winter, 1962/63.

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