Circuit board keying arrangement

Details Circuit board keying arrangement Circuit board keying arrangement

1981-02-09

1983-03-22

McQuade, John

Geometrical instruments

339113R, 339176MP, 339184M, H01R 1364

Patent

active

043773150

ABSTRACT:
An arrangement for keying plug-in circuit boards and their receptacles so that a user is alerted visually and audibly if an attempt is made to insert a board into an improper receptacle. Contacts on the board are arranged in coded locations along the edges of the board which slide into the guide rails of the receptacles. Contact assemblies are mounted on the guide rails in a similar coded arrangement. The contacts and contact assemblies are positioned in such a manner that at least one board contact will electrically engage a receptacle contact assembly and energize an alarm before the board can be fully inserted into an improper receptacle.

REFERENCES:
patent: 3177461 (1965-04-01), Hagan et al.
patent: 3246279 (1966-04-01), Storcel
patent: 3641498 (1962-02-01), Hedin
patent: 3872435 (1975-03-01), Cestaro
patent: 3911398 (1975-10-01), Vogel
patent: 4017770 (1977-04-01), Valfre
patent: 4084875 (1978-04-01), Yamamoto
patent: 4223973 (1980-09-01), Tamburro
patent: 4239323 (1980-12-01), Tamburro
patent: 4327353 (1982-04-01), Beard et al.

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