Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-12-12
1989-09-19
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
2502221, 341527, 341691, 341693, G08B 2100
Patent
active
048685437
ABSTRACT:
A remote mailbox alarm system comprising a mailbox unit (10) and a house module (14) is disclosed. The mailbox unit (10) comprises a position-sensitive door switch (22) which activates timer circuit (54), a mail sensing circuit (37), and a transmitter (56) located on an insert board (24) insertable inside mailbox (12). When activated, mail sensing circuit (37) energizes a light-emitting diode (34) to emit infrared light waves that reflect off mail placed inside mailbox (12) and onto phototransistor (36) which thereby causes the transmitter switch (49) to energize transmitter (56). When door switch (22) is opened, the timer circuit (54) allows the transmitter (56) to continue transmitting for a predetermined period of time. Signals from transmitter (56) are received by receiver circuit (58) which activates a speaker (60) and a lamp (48). When the timer circuit (54) times out, the speaker (60) is deactivated while lamp (48) continues lit until deenergized by the pushing of reset switch (62).
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Swann III Glen R.
Synpac Corporation
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