Electronic security system with novel electronic T-handle lock

Details Electronic security system with novel electronic T-handle lock Electronic security system with novel electronic T-handle lock

1993-03-05

1999-12-21

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082535, 70278, 70472, 221 7, H04Q 100

Patent

active

060054875

ABSTRACT:
An electronic security system includes an electronic lock mechanism and an electronic key, each of which is provided with a microprocessor controller and a memory storing data including an ID code and encryption key codes. The lock microprocessor may either change ID codes stored in its memory or encrypt a seed number to be used for determining access to the lock. The key can only be used to access the lock either once or for a limited number of successive times, and must thereafter be reprogrammed by a host computer to be loaded with either the proper ID code or the appropriate encryption key code for that lock. The electronic lock operates a solenoid which retracts a bolt-blocking mechanism that prevents the unlocking of the bolt even when a key having the correct mechanical key cuts is inserted into the lock. Power for operating the electronic lock as well as the solenoid is provided by a power supply within the key. In a preferred embodiment the key unit is composed of a handheld computer with a separate internal circuit board which stores key code information and performs encryption/decryption functions. A novel electronic T-lock assembly is also provided for use with vending machines and the like.

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