Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1989-02-08
1990-12-25
Echols, P. W.
Metal working
Method of mechanical manufacture
Assembling or joining
361218, 244 1A, 4034081, 403 18, B23P 1902
Patent
active
049792814
ABSTRACT:
The invention is a flush head fastener for joining two or more structural elements together. The structural elements have a fasterner 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
patent: 4630168 (1986-12-01), Hunt
Brindisi Anthony E.
Smith Charles R.
Tyree Gerald W.
Dachs Louis L.
Echols P. W.
Lockheed Corporation
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