Patent US2620431A successfully refreshed from Google Patents.
US4096473A
Expired / Lapsed
US
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High output smoke and heat detector alarm system utilizing a piezoelectric transducer and a voltage doubling means
Assignee: ARCOTRONICS Inc
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Filing: 1976-12-09
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Granted: 1978-06-20
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Expires: 1996-12-09
Abstract
Abstract A high output smoke and heat detector alarm system comprises a high output audible alarm means which includes a piezoelectric transducer and a voltage doubling means in combination with an improved smoke and heat detector which includes a low voltage power supply source, an ambient temperature detecting means, at least one ionization sensing chamber, a voltage amplitude comparing means, and a low voltage sensing means.
Inventors
- 👤 Louis P. Sweany
- 👤 Michael T. Burk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:19
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/06; Y; Y10; Y10S; Y10S331/00; Y10S331/03
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
87 words
In a smoke and heat detector comprising a low voltage power supply source, an ambient temperature detecting means electrically coupled to said power supply source, at least one ionization sensing chamber electrically coupled to said power supply source in parallel with said temperature detecting means, and a voltage amplitude comparing means electrically coupled to said ionization sensing chamber and said power supply source, the improvement wherein said voltage amplitude comparing means includes a field effect transistor and a bipolar transistor which in combination comprise a schmitt trigger.
Claim 2
Dependent Claim
87 words
In a smoke and heat detector comprising a low voltage power supply source, an ambient temperature detecting means electrically coupled to said power supply source, at least one ionization sensing chamber electrically coupled to said power supply source in parallel with said temperature detecting means, and a voltage amplitude comparing means electrically coupled to said ionization sensing chamber and said power supply source, the improvement wherein said voltage amplitude comparing means includes a field effect transistor and a bipolar transistor which in combination comprise a schmitt trigger.
Claim 3
Dependent Claim
66 words
The smoke and heat detector as recited in claim 1 wherein said field effect transistor has its gate electrically coupled to an output of said ionization sensing chamber, its source electrically coupled to one side of said power supply source through a parallel combination of a resistor and a capacitor, and its drain electrically coupled to another side of said power supply source through a resistor.
Claim 4
Dependent Claim
64 words
The smoke and heat detector as recited in claim 2 wherein said bipolar transistor is an NPN transistor having its emitter electrically coupled to said source of said field effect transistor, its base electrically coupled to said drain of said field effect transistor through a variable resistor, and its collector electrically coupled to an output of said smoke and heat detector through a resistor.
Claim 5
Dependent Claim
24 words
The smoke and heat detector as recited in claim 1 further comprising a low voltage sensing means electrically coupled to said power supply source.
Claim 6
Dependent Claim
24 words
The smoke and heat detector as recited in claim 4 wherein said low voltage sensing means includes a relaxation oscillator and a zener diode.
Claim 7
Dependent Claim
19 words
The smoke and heat detector as recited in claim 5 wherein said relaxation oscillation includes a programmable unjunction transistor.
Claim 8
Dependent Claim
78 words
A high output smoke and heat detector alarm system comprising, in combination, a smoke and heat detector which includes a low voltage power supply source, an ambient temperature detecting means, and at least one ionization sensing chamber; and a high output audible alarm means responsive to said smoke and heat detector which includes a piezoelectric transducer and a voltage doubling means whereby a voltage is supplied to said piezoelectric transducer which is double said power supply source voltage.
Claim 9
Dependent Claim
78 words
A high output smoke and heat detector alarm system comprising, in combination, a smoke and heat detector which includes a low voltage power supply source, an ambient temperature detecting means, and at least one ionization sensing chamber; and a high output audible alarm means responsive to said smoke and heat detector which includes a piezoelectric transducer and a voltage doubling means whereby a voltage is supplied to said piezoelectric transducer which is double said power supply source voltage.
Claim 10
Dependent Claim
46 words
The alarm system as recited in claim 7 wherein said smoke and heat detector further includes a voltage amplitude comparing means electrically coupled to said ionization sensing chamber and said power supply source and a low voltage sensing means electrically coupled to said power supply source.
Claim 11
Dependent Claim
21 words
The alarm system as recited in claim 8 whereinsaid low voltage sensing means includes a relaxation oscillator and a zener diode.
Claim 12
Dependent Claim
18 words
The alarm system as recited in claim 9 wherein said voltage amplitude comparing means is a schmitt trigger.
Claim 13
Dependent Claim
21 words
The alarm system as recited in claim 10 wherein said schmitt trigger includes a field effect transistor and a bipolar transistor.
Claim 14
Dependent Claim
41 words
The alarm system as recited in claim 7 wherein said high output audible alarm means further includes a pulsator means electrically coupled to an output of said smoke and heat detector and an oscillator means electrically coupled to said pulsator means.
Claim 15
Dependent Claim
24 words
The alarm system as recited in claim 12 wherein said pulsator means and said oscillator means comprise a Quad two-input NAND gate integrated circuit.
Claim 16
Dependent Claim
30 words
The alarm system as recited in claim 13 further comprising a logic driving means responsive to said smoke and heat detector for driving said Quad two-input NAND gate integrated circuit.
Claim 17
Dependent Claim
16 words
The alarm system as recited in claim 13 wherein said piezoelectric electric transducer includes three electrodes.
Claim 18
Dependent Claim
65 words
The alarm system as recited in claim 15 wherein said voltage doubling means includes at least two bipolar buffer amplifiers one of which is electrically coupled to a first output of said oscillator means and a first electrode of said piezoelectric transducer and another of which is electrically coupled to a second output of said oscillator means and a second electrode of said piezoelectric transducer.
Claim 19
Dependent Claim
20 words
The alarm system as recited in claim 7 further comprising an acoustics enhancement means acoustically coupled to said piezoelectric transducer.
Claim 20
Dependent Claim
24 words
The alarm system as recited in claim 17 wherein said acoustics enhancement means includes an aperture termination in spaced relation to said piezoelectric transducer.
Claim 21
Dependent Claim
23 words
The alarm system as recited in claim 18 wherein said acousitcs enhancement means further includes a resonant cavity coupled to said piezoelectric transducer.
Claim 22
Dependent Claim
25 words
The alarm system as recited in claim 19 wherein said acoustics enhancement means further includes a single wavelength baffle acoustically coupled to said resonant cavity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |