Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-06-21
1991-03-12
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
2502221, 340556, G08B 1314
Patent
active
049996126
ABSTRACT:
A wired mail delivery indicator having a physical construction which forces any size of mail across a groove (20). Slope on the left vertical wall of mailbox (10), slope of panel (14), and force of gravity cause mail to block light beam. The light beam is generated by a photodiode emitter (22) and detected by a photo detector (24). Mailbox and electronic circuitry (26) contains photodiode emitter (22), photo detector (24), current limiting resistor (42), and current amplifier transistors (46 and 48). House end electronic circuitry (28) contains power transformer (32), diode rectifier (34), and current sensor (38, 40, and 36). House/mailbox connecting wire (18) carries power and mail delivery information with two wires.
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Mullen Jr. Thomas J.
Swann III Glen R.
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