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US 4,568,134 AGranted
Printed circuit board keying system
AssigneeE. I. Du Pont de Nemours and Company
InventorVincent D. DiMondi
Life of this patent
Estimating the term…
Abstract
Incorrect pairing of subsidiary printed circuit boards on opposite sides of a main circuit board is prevented by providing a key or orientation insert on each subsidiary circuit board which projects more than half way through an aperture in the main circuit board. Only subsidiary circuit boards with orientation inserts that complement one another in the main circuit board aperture can be mounted opposite one another on the main circuit board.
Claims16
Apparatus for ensuring correct pairing of two subsidiary electrical circuit board assemblies on opposite sides of a main electrical circuit board assembly comprising:
- an aperture through the main circuit board assembly between the two subsidiary circuit board assemblies along an axis perpendicular to the plane of the main circuit board assembly;
- and
- an orientation insert member mounted on each subsidiary circuit board assembly for projection into the aperture coaxial with the axis of the aperture, the end portion of each insert remote from the associated subsidiary circuit board assembly having a transverse cross section which is one lateral half of a closed geometric shape which is symmetrical about the axis of the aperture, said end portion of each insert projecting more than half way through the aperture when the associated subsidiary circuit board assembly is mounted on the main circuit board assembly so that both inserts can fully enter the aperture without interfering with one another only if said end portions of the inserts are oriented so that their transverse cross sections are complementary halves of the closed geometric shape.
Dependencies are inferred from the claim text.