Self-contained electronic lock with changeable master and slave

Details Self-contained electronic lock with changeable master and slave Self-contained electronic lock with changeable master and slave

1992-06-22

1996-04-16

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

361172, 34082532, 2353825, G06F 704

Patent

active

055086918

ABSTRACT:
An erasable circuit provides a nonvolatile memory for holding key codes in at least two memory locations. At least one of these locations is a master key code address. "Master key" here means a key that can command a lock to store a key code or to erase a stored key code. An input device makes electrical connection to an electronic key--such as a ROM key--to receive from the key an electronic code that is in essence unique to that key. The lock also has provision for comparing such a received code with the contents of each of the address locations, and it responds to the comparison by performing a lock-management function. Such functions include opening or closing a lock, changing the state of a key switch, rejecting a key, and validating or invalidating a key--particularly including a master key--by physically changing the contents of the nonvolatile memory. Perceptible signals identify the lock-management function for human users. For ordinary lock applications, operation of the lock is preferably induced by a key engagement that is momentary; for vehicular and various other applications, however, operation may be preferably initiated by an engagement as protracted as operation of the vehicle etc.

REFERENCES:
patent: 3821704 (1974-06-01), Sabsay
patent: 4392133 (1983-07-01), Lundgren
patent: 4519228 (1985-05-01), Sornes
patent: 4742426 (1988-05-01), Lavelle

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