Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1979-06-26
1981-03-31
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340 63, 340574, G08B 108, B60R 2510
Patent
active
042596645
ABSTRACT:
In the event that a taxicab driver is threatened with robbery, he depresses a silent floor switch in his taxicab which initiates two different alarm or alerting mechanisms, neither of which are visible to the robber who is normally sitting in the back seat of the taxicab. First, a special warning light appears on the roof of the cab; and second, a coded signal is sent back to the dispatcher's office to both identify the serial number of the cab in which the robbery is threatened, and also to provide a continuous coded signal which may be employed to direct police or private detectives to the location of the robbery. The equipment is compatible with existing radio equipment interconnecting the taxicab dispatcher's office and the taxicab, and at the dispatcher's office merely involves the provision of counting and display circuitry and possibly supplemental filter circuitry; and at each taxicab, the addition of a tone generator, a pulse train generator, and timing circuitry for disabling the pulse generator after a predetermined number of pulses representing the serial number of the taxicab, have been transmitted.
REFERENCES:
patent: 2840795 (1958-06-01), Yun Gee
patent: 2891140 (1959-06-01), Huff
patent: 2979706 (1961-04-01), Simon et al.
patent: 3864674 (1975-02-01), Worsham et al.
patent: 3909826 (1975-09-01), Schildmeier et al.
patent: 4020477 (1977-04-01), Holland
patent: 4027276 (1977-05-01), Shaughnessy
patent: 4032848 (1977-06-01), Shaughnessy
patent: 4057790 (1977-11-01), Fleming et al.
Tubill Enterprises, Inc.
Waring Alvin H.
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