Patent
1974-09-20
1976-01-06
Claffy, Kathleen H.
317137, H04Q 300
Patent
active
039314812
ABSTRACT:
An electronic selector switch is disclosed that enables selection of one of a plurality of output circuits. The selector contains a plurality of bistable electronic switch means, each of which includes a first "set" input and a second "reset" input; a corresponding plurality of momentary contact switches; each momentary contact switch has an output connected in circuit with the "set" input of a corresponding one of the plurality of bistable electronic switch means; a corresponding plurality of logic circuit means with the output thereof connected to the "reset" input of a corresponding one of the plurality of bistable electronic switch means and with the inputs thereof coupled to the output of all said momentary contact switch means associated with all of the other electronic switch means, but not the output of that one of said momentary contact switch connected in circuit with the set input of the associated electronic switch, whereby operation of a selected one of said selector switch means enables operation of the one of said electronic switch means associated therewith to the "set" condition and "resets" the remainder of said bistable switch means. In combination therewith an additional electronic switch means is provided for producing an output for only a predetermined short interval. In this a momentary contact switch means is connected to the input of the last-named electronic switch for enabling said additional electronic switch means. And means for generating a pulse upon the release of said momentary contact switch means and coupling said pulse, directly or indirectly, to the "reset" inputs of all of the aforedescribed bistable electronic switch means.
REFERENCES:
patent: 2971135 (1961-02-01), Ebert
patent: 3150238 (1964-09-01), Carter
patent: 3296499 (1967-01-01), Quinlan
patent: 3469151 (1969-09-01), Newland
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patent: 3691431 (1972-09-01), Hendrickson
patent: 3757056 (1973-09-01), Foulkes
Claffy Kathleen H.
Goldman Ronald M.
Litton Business Telephone Systems, Inc.
Myers Randall P.
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