Flush head fastener

Details Flush head fastener Flush head fastener

1987-12-21

1989-12-05

Wilson, Neill R.

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

Torque responsive nut or bolt driving connection

Frangible connection

411 82, 411377, 411903, 244 1A, F16B 1900, F16B 3100, F16B 3300

Patent

active

048849294

ABSTRACT:
The invention is a flush head fastener for joining two or more structural elements together. The structural elements have a fastener hole therein with one of the structural elements being countersunk to accommodate the head of the fastener. The fastener includes head and shank portions and a layer of material joined to the top of the head of the fastener which can readily be deformed to fill any gaps between the head and the countersink. Thereafter, the excess material can be removed leaving an aerodynamically smooth surface. The surface also will have no electrical discontinuities. The procedure for installing the fastener includes the steps of (1) providing two or more structural elements having a countersunk fastener hole therein (2) thereafter the fastener is installed in the hole (3) the layer of material is deformed so as to fill any gaps between the head of the fastener and the countersink, and (4) thereafter, excess material is removed leaving a smooth external surface. Preferably, the step of deforming includes the step of heating the layer of material to a point where it is readily deformable.

REFERENCES:
patent: 1145256 (1915-07-01), Mochow et al.
patent: 3812757 (1974-05-01), Reiland
patent: 4479163 (1984-10-01), Bannink, Jr. et al.
patent: 4502092 (1985-02-01), Bannink, Jr. et al.
patent: 4628402 (1986-12-01), Covey
patent: 4630168 (1986-12-01), Hunt
patent: 4681497 (1987-07-01), Berecz
Hodgson, Abstract of Application S. N. 628,044, published May 20, 1952, 658 O.G. 915.

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