Patent US3723876A successfully refreshed from Google Patents.
US3723876A
Expired / Lapsed
US
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Emergency distress signaling system
Assignee: Individual
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Filing: 1971-06-21
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Granted: 1973-03-27
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Expires: 1991-06-21
Abstract
Abstract A system for addition to a conventional dispatched vehicle twoway radio communication system to enable an operator to notify a central dispatcher of an emergency condition arising after the operator leaves the vehicle. The system includes a unit which plugs directly into the microphone input of the conventional system and which is responsive to a signal transmitted from a portable transmitter carried by the operator for playing a prerecorded emergency message through the transmitter of the conventional radio system.
Inventors
- 👤 G Seaborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:50
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/012
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
238 words
A portable add-on emergency assistance radio signaling system for interconnection into a conventional dispatched vehicle communication system already present in a vehicle, said conventional dispatched vehicle communication system including a vehicle-mounted radio receiver and transmitter having a control head including a detachably connected microphone for communication with a central dispatcher, wherein said portable add-on emergency assistance radio signaling system comprises: a portable add-on unit for being removably electrically plugged in between said microphone and said control head to enable normal conventional usage of said microphone with said vehiclemounted transmitter; said add-on unit further including a normally unactuated prerecorded emergency assistance message player having an output connected to the input of said control head; a portable radiO transmitter adapted for carriage by an operator and having a switch operable to actuate said portable radio transmitter in the event of the operator''s need for emergency assistance, said portable radio transmitter generating a signal which is modulated by coded frequency tones; a radio receiver mounted within said add-on unit receptive to signals transmitted by said portable transmitter and including means for decoding said coded frequency tones; and means within said add-on unit responsive to reception of a signal from said portable transmitter by said receiver mounted in said portable add-on unit for both actuating said prerecorded emergency assistance message player and for coupling a message signal into said control head to notify the dispatcher of the operator''s need for emergency assistance.
Claim 2
Dependent Claim
238 words
A portable add-on emergency assistance radio signaling system for interconnection into a conventional dispatched vehicle communication system already present in a vehicle, said conventional dispatched vehicle communication system including a vehicle-mounted radio receiver and transmitter having a control head including a detachably connected microphone for communication with a central dispatcher, wherein said portable add-on emergency assistance radio signaling system comprises: a portable add-on unit for being removably electrically plugged in between said microphone and said control head to enable normal conventional usage of said microphone with said vehiclemounted transmitter; said add-on unit further including a normally unactuated prerecorded emergency assistance message player having an output connected to the input of said control head; a portable radiO transmitter adapted for carriage by an operator and having a switch operable to actuate said portable radio transmitter in the event of the operator''s need for emergency assistance, said portable radio transmitter generating a signal which is modulated by coded frequency tones; a radio receiver mounted within said add-on unit receptive to signals transmitted by said portable transmitter and including means for decoding said coded frequency tones; and means within said add-on unit responsive to reception of a signal from said portable transmitter by said receiver mounted in said portable add-on unit for both actuating said prerecorded emergency assistance message player and for coupling a message signal into said control head to notify the dispatcher of the operator''s need for emergency assistance.
Claim 3
Dependent Claim
50 words
An add-on emergency assistance radio signaling system as set forth in claim 1 wherein said message player actuating means includes: a timing circuit actuated in response to reception of a transmitted signal by said receiver for energizing said player for a preselected period of time and then deactuating said player.
Claim 4
Dependent Claim
104 words
An add-on emergency assistance radio signaling system as set forth in claim 1, wherein said message player actuating means includes: a cycle timing circuit actuated in response to reception of a transmitted signal by said receiver, said circuit cyclically remaining actuated for a first preselected period of time and then deactuated for a second preselected period of time; and a message timing circuit triggered in response to actuation of said cycle timing circuit and remaining actuated for a third preselected period of time of energizing said message player during the third preselected period and then cyclically repeating each time said cycle time is actuated.
Claim 5
Dependent Claim
67 words
An emergency assistance radio signaling system as set forth in claim 1 wherein said message player actuating means includes a relay having a normally open contact set, one of said contacts being connected to a power source and the other being connected to the power input of said player, said relay being operated in response to reception of a signal from said portable transmitter by said receiver.
Claim 6
Dependent Claim
77 words
An emergency assistance radio signaling system as set forth in claim 1 wherein said portable radio transmitter comprises: a radio frequency transmitter including a crystal controlled oscillator for generating a carrier signal for said transmitter; an encoder for producing a plurality of preselected tones for amplitude modulating the carrier from said transmitter; and wherein said signal responsive means includes a decoder and gating means responsive to a transmitter carrier signal modulated by said plurality of preselected tones.
Claim 7
Dependent Claim
39 words
An emergency assistance radio signaling system as set forth in claim 1 wherein said portable transmitter also includes: means for actuating said transmitter upon disorientation of the transmitter body from a predetermined position for a preselected period of time.
Claim 8
Dependent Claim
44 words
An emergency assistance radio signaling system as set forth in claim 1 wherein said portable transmitter also includes: an actuation switch formed of magnetic material; and a movable magnet, said actuation switch being closed in response to proximity of said magnet to said switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |