Metal working – Method of mechanical manufacture – Electrical device making
Patent
1993-06-24
1994-03-22
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29852, 174262, 174266, 439 84, 428901, H01K 310
Patent
active
052952991
ABSTRACT:
To the end of forming a countersunk hole in a metallic printed circuit board consisting of a metallic plate, an insulating layer, and a printed circuit pattern formed on the insulating layer, for receiving a countersunk head of a mounting screw which is passed through the hole, a rough straight hole consisting of a central main part and radial extensions extending therefrom is first formed in the metallic printed circuit board, and a countersunk portion is formed around the hole by plastic deformation. Since the material of the metallic plate of the metallic printed circuit board is allowed to flow into the extensions of the hole during plastic deformation, the material of the metallic plate in the immediate vicinity of the hole is allowed to flow both radially and circumferentially, and the resulting reduction in the difference in the amount of deformation between the metallic plate and the insulating layer prevents the peeling of the insulating layer from the metallic plate.
REFERENCES:
patent: 2990533 (1961-06-01), Hughes et al.
patent: 3142783 (1964-07-01), Warren
patent: 3411148 (1968-11-01), Fetterolf et al.
patent: 3445921 (1969-05-01), Leenhouts
patent: 4107836 (1978-08-01), Roberts
patent: 4110904 (1978-09-01), Johnson
patent: 4491622 (1985-01-01), Butt
IBM Technical Disclosure Bulletin vol. 25, No. 7A Dec. 1982 pp. 3512-3513 by Jones.
Arbes Carl J.
NHK Spring Co. Ltd.
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