Patent ID: 9728017
Date: 2017-08-08
CPC Classifications: E05B,G07C

Claim:
1. An electronic door access control apparatus for restricting access via a door installed in a door frame and comprising a lock mechanism having a latch bolt and using a key comprising a unique coded ID sequence, the apparatus comprising: a key reader for reading the key and comprising a tamper switch; a latch release mechanism; a door control unit separate from said key reader and said latch release mechanism, installed in the door frame proximate to said key reader and said latch release mechanism and comprising a controller and memory comprising a plurality of predetermined allowed coded ID sequences, wherein said door control unit is operationally connected to said tamper switch; and an encrypted binding interconnecting said key reader and said door control unit, wherein said encrypted binding is established by one of an external programming device and a master key card; wherein when the key is positioned proximate to said key reader, the coded ID sequence is read by the key reader and relayed to said door control unit via an encrypted communication channel interconnecting said key reader and said door control unit for processing, wherein when the coded ID sequence matches one of said plurality of predetermined allowed coded ID sequences, said door control unit actuates said latch release mechanism, thereby allowing the door to be opened, and further wherein when said door control unit detects tampering of said key reader via said tamper switch, said encrypted binding between said key reader and said door control unit is terminated, thereby preventing actuation of said latch release mechanism.