Electronic lock system

Details Electronic lock system Electronic lock system

1991-02-11

1992-06-23

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082533, H04B 100

Patent

active

051246961

ABSTRACT:
The electronic lock system is useful for a key safe where many different persons must have controlled, recorded access. Each user has a card key which is connected to one of a plurality of key safes to complete the system. The user inserts his personal identification number (PIN) into the card key in order to activate the card key. The card key is laid against a key safe so that an exchange of data takes place between key safe and card key to perform the security, access and control functions. The card key and key safe interact to exchange information so that the key safe may have memory of which card key is being used at which time, and vice versa. Updating of other memory functions can be accomplished. Validity is verified if a board number and a security level number in the card key relate correctly to their counterparts in the key safe and if the card identification (CID) number is not in the lock invalid CID number list. When valid, the key safe can be opened. By pressing in the key safe key compartment against a spring, the pole plate is pressed against its electromagnet. When the card key data have been verified, the electromagnet is turned on for a short period to hold the pole plate in released position. The key safe key compartment moves out away from latched position before the pole plate is released.

REFERENCES:
patent: 4649723 (1987-03-01), Appelbaum
patent: 4838052 (1989-06-01), Williams et al.
patent: 4914732 (1990-04-01), Henderson et al.
patent: 4993762 (1991-02-01), Rogers et al.
patent: 5014049 (1991-05-01), Bosley

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