Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element – Having plastically flowable or deflectable end – e.g. – rivet,...
Patent
1990-03-23
1991-06-25
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element
Having plastically flowable or deflectable end, e.g., rivet,...
411504, 295241, 295252, F16B 1906
Patent
active
050262343
ABSTRACT:
An expandable head rivet for sealing applications and the like having improved inspectability after setting. The rivet has an axially extending shank, a first substantially cylindrical section and a second tapered section between the first section and the shank, all generally conforming to the hole and counterbores in the workpiece. The face of the rivet head has a raised central section having a substantially flat surface perpendicular to the axis of the rivet of a cross sectional area of at least a substantial percentage of the cross sectional area of the shank of the rivet. Upon setting of the rivet in the workpiece, the head end of the rivet is flattened and radially expanded to tightly engage the cylindrical counterbore. In the event that the cylindrical counterbore in the workpiece is longer than intended and longer than the corresponding section of the rivet head, the periphery of the endface of the set rivet will be disposed within the counterbore, thereby providing a visual indication that the counterbore was deeper or longer than expected, and also providing a visual indication of the possibility that the frustro-conical section of the rivet is not in tight engagement with the frustro-conical counterbore in the workpiece.
REFERENCES:
patent: 3927458 (1975-12-01), Speakman
patent: 4000680 (1977-01-01), Briles
patent: 4051592 (1977-10-01), Briles
patent: 4086839 (1978-05-01), Briles
patent: 4159666 (1979-07-01), Briles
Allfast Fastening Systems, Inc.
Wilson Neill R.
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