Communications: electrical – Digital comparator systems
Patent
1977-11-09
1980-02-19
Pitts, Harold I.
Communications: electrical
Digital comparator systems
340542, 340543, 235382, H04Q 300
Patent
active
041897129
ABSTRACT:
A system and method are provided for opening a lock or activating a switch by electronically controlled means. In one form, a finger ring is provided which contains a code recording supported within or adjacent the crown thereof. When the hand of the person wearing the ring is held near a reading device, such as to dispose the crown within a recepticle containing the reading device, the code is automatically read and electrical signals generated thereby are applied to close or open an electrical switch or operate a motor or solenoid for opening a lock and/or drive a door to open. If the signals generated in reading the ring recording is a code, they may be applied to a comparator for operating the lock or switch if the code is an enabling code. The reading device may comprise a photoelectric cell or bank of cells adapted to read variations in reflectivity of the ring code. In another form, the ring may contain an electronic circuit or devices which generate a code in the presence of a radiation field generated in the vicinity of the recepticle for the ring upon sensing the presence of the ring. In another form, the ring may contain a battery and electronic circuit means for generating the enabling code when a switch is closed. In another form, the combination of the code generating means of the ring and a separate circuit such as a circuit card, may be required to enable the switch to close or the lock to open. Improvements are also provided in the constructions of electronic keys in the configurations of finger rings, wrist watches, cards and the like, for use in switch and lock activating systems, security and transaction systems and the like.
REFERENCES:
patent: 3134254 (1964-05-01), Richard
patent: 3733862 (1973-05-01), Killmeyer
patent: 3872435 (1975-03-01), Cestaro
patent: 3979647 (1976-09-01), Perron
patent: 4079356 (1978-03-01), Anagnost
patent: 4080594 (1978-03-01), Plevy
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