Communications: electrical – Continuously variable indicating – With meter reading
Patent
1981-03-16
1983-11-15
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
235382, 340543, H04Q 900
Patent
active
044158939
ABSTRACT:
A door control unit for electronically locking and unlocking one or more doors. The door control unit includes door locking means having a rotatable lock cylinder for locking and unlocking a door, means engaging the lock cylinder for normally locking the door, and means responsive to a control signal for unlocking the door. A key is included having a first and second series of light-refractive discrete encoded clocking and data bars formed thereon. The lock cylinder includes photodiode means for reflectively decoding the encoded data on the key upon insertion of the key into the lock cylinder, thereby generating a first identification code. The first code is compared with at least one other predetermined identification code by processor means and if the two signals correspond, the control signal is generated thereby unlocking the door.
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Roland Manfred W.
Roland Max G.
All-Lock Electronics, Inc.
Yusko Donald J.
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