Emergency communications system

• US 3,939,417 A
• Filed: 12/18/1973
• Issued: 02/17/1976
• Est. Priority Date: 12/18/1973
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Cannalte, Gary A., Rollins, Thomas J., Koenig, Richard D., Walker, Donald L., Crouse, Richard J.
• Primary Examiner(s): Mayer, Albert J.
• Assistant Examiner(s): Bookbinder, Marc E.
• Application Number:
  US05/425,908
• Time in Patent Office: 791 Days
• Field of Search: 325/3, 325/5, 325/16, 325/51, 325/53, 325/55, 325/64, 325/113, 325/117, 325/302, 340/31, 340/213.1, 340/213.2, 340/224, 340/226, 340/408, 343/176, 343/177, 343/200, 179/1 MN, 179/1 NE, 179/2 A, 179/2 B, 179/2 E, 179/2 DP, 179/5 R, 179/5.5, 179/17 A, 179/17 B, 179/17 R, 179/27 FF, 179/41 A
• US Class Current: 455/9
• CPC Class Codes: H04B 1/56 with provision for simultaneous communication in two directions

Abstract

A control console including a transceiver, a plurality of terminal stations positioned at spaced apart locations remote from the console and each including a transceiver connected to the console by RF or a wire line, and a plurality of call boxes positioned at spaced apart locations adjacent to each terminal station and including a transceiver in communication with the terminal station. When the hand set of a call box is lifted from the cradle a tone is transmitted through the adjacent terminal station to the console which then keys on all terminal station transmitters to indicate a busy line at other call boxes and to provide a ringing signal at the call box being used. Subsequent to transmission of the tone, a signal indicative of the address of the box and the condition of predetermined portions of the box is automatically transmitted to the console. When the console operator answers, full duplex communication is provided between the call box and the console.

Claims

1. An emergency communications system comprising:

a. a control console including a transceiver with a transmitter and receiver portion;

b. a plurality of terminal stations positioned at spaced apart locations remote from said console, each including a transceiver with a transmitter and receiver portion in communication with said console;

c. a plurality of call boxes fixedly positioned at spaced apart locations adjacent to each terminal station, each of said call boxes including a transceiver tuned for full duplex communications with the transceiver in said adjacent terminal station;

d. switch means positioned in each of said call boxes for operation by a person in an emergency;

e. first circuit means positioned in each of said call boxes and connected to said switch means and said call box transceiver for causing said call box transceiver to transmit a first signal of predetermined duration to the transceiver of said console through the transceiver in said adjacent terminal station upon actuation of said switch means;

f. first circuit means positioned in said console and connected to the console transceiver for causing to be transmitted a signal to said terminal stations, upon reception of the first signal from one of said call boxes, for keying the transmitter portion of the transceiver in each of said terminal stations to provide a busy signal to all remaining call boxes;

g. ringing circuit means positioned in each of said call boxes and connected to said call box transceiver for providing a ringing signal to the person operating said one of said call boxes upon reception of a signal from the keyed transmitter portion of the transceiver in its respective adjacent terminal station responsive to said signal;

h. transmitted from said console second circuit means positioned in each of said call boxes and connected to said first circuit means for automatically causing to be transmitted by said call box transceiver subsequent to the first signal, a second signal indicative of the address of said call box and condition of predetermined portions of the call box;

i. second circuit means positioned in said console and connected to the console transceiver for indicating the address and condition of said calling call box upon reception of the second signal from said call box transceiver by way of the transceiver in its respective adjacent terminal;

j. station busy signal indicating means positioned in each of said call boxes and connected to receive busy signals from said adjacent terminal stations for indicating one of said call boxes in the system is in use upon reception of a busy signal; and

k. transducer means mounted in each of said call boxes and in said control console and operatively connected to the transceivers therein for voice communication between any of said call boxes and said control console.

2. An emergency communications system as claimed in claim 1 wherein the terminal stations are connected to the console through a wire line.

3. An emergency communications system as claimed in claim 1 wherein the transducer means includes a hand set having a microphone and a speaker therein connected to the transceiver in each call box and positioned to activate the switch means when said hand set is raised from a cradled position.

4. An emergency communications system as claimed in claim 3 wherein each of the call boxes includes a weatherproof housing having an access door therein.

5. An emergency communications system as claimed in claim 4 having in addition second switch means positioned in each of said call boxes and mounted for activation when the access door is opened, each of said second switches being connected to the call box transceiver for applying power thereto upon activation of said second switch.

6. An emergency communications system as claimed in claim 5 wherein each of the call boxes includes an internal battery connected to power the circuitry therein.

7. An emergency communications system as claimed in claim 6 wherein each of the call boxes includes sensing means connected to the second circuit means for indicating normal and abnormal conditions of the internal battery, the access door, the hand set and an internal enclosure of the electronics components, and the second signal transmitted by the call box transceiver includes an indication of the sensing means output.

8. An emergency communications system as claimed in claim 1 including in addition timing means connected to the transceiver in each call box for automatically turning off the transmitter portion thereof after a predetermined period of time.

9. An emergency communications system as claimed in claim 1 wherein the console includes circuitry for interrogating each call box as to the condition of predetermined portions thereof and each call box includes circuitry for periodically activating the receiver portion of the transceiver therein and for activating the transmitter portion of the transceiver therein in response to a received interrogation signal from the console.

10. An emergency communications system as claimed in claim 1 wherein the transmitter portion of the transceiver in each call box includes a primary and secondary channel and a selection circuit for activating the unused channel during operation of the transceiver and each terminal station has a second receiver portion associated with the transceiver therein, tuned to the secondary channel for providing the console with an indication of a second caller when the primary channel is being used.

11. An emergency communications system as claimed in claim 1 including in addition a plug in address card for each call box connected to the second circuit means to provide each call box with a predetermined address.