Patent US3786498A successfully refreshed from Google Patents.
US3786498A
Expired / Lapsed
US
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Audio-visual warning system
Assignee: Individual
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Filing: 1971-12-02
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Granted: 1974-01-15
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Expires: 1991-12-02
Abstract
Abstract An audio-visual warning system for mechanized vehicles which is activated by a single act of the vehicle''s operator. This is accomplished by connecting an audio warning element, such as a horn, and a visual warning element, such as a light, in parallel with a horn button and a power supply. Thus when the horn button is depressed the circuit is closed and both an audible sound and visible light are emitted to warn approaching traffic and pedestrians of an impending danger.
Inventors
- 👤 G Lipe
- 👤 W Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:01
CPC Classifications
G; G08; G08B; G08B7/00; G08B7/06; B; B60; B60Q; B60Q5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
284 words
A mechanized vehicle electrical audio-visual warning system comprising: a. a power supply; b. first means for producing a visible light when connected to said power supply; c. second means for producing an audible sound when connected to said power supply; d. a normally open switch selectively closable by an operator to connect said second means directly to said power supply; and e. relay subassembly means comprising a diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a non-polar capacitor, a silicon controlled rectifier and a programmable unijunction transistor, the anode of the diode being connected to one side of said switch, the first resistor being connected between the cathode of the diode and the gate of the silicon controlled rectifier, the second resistor being connected between the gate and cathode terminals of the silicon controlled rectifier, the capacitor being connected between the anode of the silicon controlled rectifier and the anode of the programmable unijunction transistor, the third resistor being connected between the gate and cathode terminals of the programmable unijunction transistor, the fourth resistor being connected between the gate of the programmable unijunction transistor and the negative side of the visible light producing means, the fifth resistor being connected between the anode of the programmable unijunction transistor and the positive side of the visible light producing means, the first and second resistors being balanced to allow sufficient current tO trigger the gate of the silicon controlled rectifier when said switch is activated, the third and fourth resistors being balanced to allow sufficient current to trigger the gate of the programmable unijunction transistor, and the fifth resistor being operable to control the discharge rate of the capacitor.
Claim 2
Dependent Claim
284 words
A mechanized vehicle electrical audio-visual warning system comprising: a. a power supply; b. first means for producing a visible light when connected to said power supply; c. second means for producing an audible sound when connected to said power supply; d. a normally open switch selectively closable by an operator to connect said second means directly to said power supply; and e. relay subassembly means comprising a diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a non-polar capacitor, a silicon controlled rectifier and a programmable unijunction transistor, the anode of the diode being connected to one side of said switch, the first resistor being connected between the cathode of the diode and the gate of the silicon controlled rectifier, the second resistor being connected between the gate and cathode terminals of the silicon controlled rectifier, the capacitor being connected between the anode of the silicon controlled rectifier and the anode of the programmable unijunction transistor, the third resistor being connected between the gate and cathode terminals of the programmable unijunction transistor, the fourth resistor being connected between the gate of the programmable unijunction transistor and the negative side of the visible light producing means, the fifth resistor being connected between the anode of the programmable unijunction transistor and the positive side of the visible light producing means, the first and second resistors being balanced to allow sufficient current tO trigger the gate of the silicon controlled rectifier when said switch is activated, the third and fourth resistors being balanced to allow sufficient current to trigger the gate of the programmable unijunction transistor, and the fifth resistor being operable to control the discharge rate of the capacitor.
Claim 3
Dependent Claim
202 words
A mechanized vehicle electrical audio-visual warning system comprising: a. a power supply; b. first means for producing a visible light when connected to said power supply; c. second means for producing an audible sound when connected to said power supply; d. a first normally open switch selectively closable by an operator to connect said second means directly to said power supply; and e. relay subassembly means including a relay coil and a second normally open switch which is closed to connect said first means to said power supply in response to energization of said coil, said coil being energized by said power supply in response to closure of said first switch, said relay subassembly means also including a diode, a resistor and a capacitor connected together in series in that order, the diode-resistor-capacitor series circuit being connected between one side of said first switch and one terminal of the power supply, the relay being connected across the resistor and capacitor in parallel therewith, said capacitor operating as a timing means effective to delay deenergization of said relay coil for a predetermined time after said first switch is opened, whereby said light remains illuminated for said predetermined time after said audible sound stops.
Claim 4
Dependent Claim
202 words
A mechanized vehicle electrical audio-visual warning system comprising: a. a power supply; b. first means for producing a visible light when connected to said power supply; c. second means for producing an audible sound when connected to said power supply; d. a first normally open switch selectively closable by an operator to connect said second means directly to said power supply; and e. relay subassembly means including a relay coil and a second normally open switch which is closed to connect said first means to said power supply in response to energization of said coil, said coil being energized by said power supply in response to closure of said first switch, said relay subassembly means also including a diode, a resistor and a capacitor connected together in series in that order, the diode-resistor-capacitor series circuit being connected between one side of said first switch and one terminal of the power supply, the relay being connected across the resistor and capacitor in parallel therewith, said capacitor operating as a timing means effective to delay deenergization of said relay coil for a predetermined time after said first switch is opened, whereby said light remains illuminated for said predetermined time after said audible sound stops.
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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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |