Electronic security system with novel electronic T-handle lock
US6005487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1993 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Mar 5, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7079
- WIPO fieldControl
- WIPO sectorInstruments
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.