Mechanical code for operated device for access to coded electric

Details Mechanical code for operated device for access to coded electric Mechanical code for operated device for access to coded electric

1977-01-10

1978-08-15

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340543, 340149A, 340164R, H04Q 300

Patent

active

041076559

ABSTRACT:
A code operated device which includes a multiplicity of coded electrical circuits to which it provides access and is mechanically operated by coded keys which respectively correspond to each of the circuits for access to a corresponding circuit. This device includes cylindrical tumblers having their edges coded by an arrangement of reflective spots, the edge coding being arranged by the relative rotation of each tumbler by the coded keys, the edge coding is read by a reflective spot readout unit and the code read is transmitted to an addressing box which in turn matches the code read to a corresponding circuit. The circuits representing the various combinations of the code used are in a conventional arrangement in circuit with said readout units by the use of a printed circuit board. With the use of binary coded decimals and with the use of four tumblers there are possible a total of 9,999 different code arrangements for a like number of circuits and the device is capable of receiving a like number of coded keys. Each addition of a tumbler increases the available number of code combinations by a multiple of ten.

REFERENCES:
patent: 2831129 (1958-04-01), Penney
patent: 3165599 (1965-01-01), Clay
patent: 3639906 (1972-02-01), Tritsch
patent: 3657496 (1972-04-01), Davidson
patent: 3663774 (1972-05-01), Feder
patent: 3854120 (1974-12-01), Matto

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