US3667419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision temperature detection and alarm system
Assignee: Standard-Farrington Alarm and Signal Corp
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Filing: 1970-09-28
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Granted: 1972-06-06
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Expires: 1990-09-28
Abstract
Abstract A temperature sensing and alarm system for quickly and accurately sensing a sharply defined temperature threshold, comprising a Freon powered horn, the Freon stored in a cylinder and normally blocked from passage to the horn by a eutectic pellet bonded in a brass cup and blocking a Freon release orifice. A heat collector is held in tight contact with an activator disc which contains the aforementioned cup, the cup having angled side walls of a thickness less than the disc portion in contact with the heat collector, thereby providing rapid and uniform heat transfer to the inter-molecular bond between the pellet and the cup, the rapid heat transfer at the eutectic temperature permitting a smaller disc orifice through which sufficient Freon pressure is applied to expel the pellet from the cup at precisely the eutectic temperature.
Inventors
- 👤 Joseph T Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:31
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/04; G10; G10K; G10K9/00; G10K9/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
238 words
Temperature detection and alarm sounding apparatus for sounding an alarm at a predetermined alarm temperature, comprising: a. a cylinder containing Freon under pressure; b. a horn, activated by Freon under pressure; c. temperature sensitive passage means, isolating said horn from said cylinder when the ambient temperature is below said alarm temperature, and providing a connecting passage between said horn and said cylinder when the ambient temperature attains said alarm temperature; d. said passage means containing an activator and a heat collector in contiguous heat transfer relationship, and thermally insulated from all other elements of the apparatus; e. said activator having a base portion in thermal contact with said heat collector, and having a cup portion normally housing a eutectic metal; f. said cup portion having walls which angle outward from said base portion and combining with said base portion to define a truncated cone, said walls having a thickness less than the thickness of said activator base; g. said base having a centrally located aperture therein for communicating Freon pressure to the eutectic material in said cup; and, h. said eutectic material being normally bonded to the inside of said cup at temperatures below said predetermined temperature, said bond disintegrating at said predetermined temperature such that said Freon pressure communicated to said eutectic material expels it from said cup, thereby providing a through passageway from said cylinder to said horn when the ambient temperature attains said alarm temperature.
Claim 2
Dependent Claim
238 words
Temperature detection and alarm sounding apparatus for sounding an alarm at a predetermined alarm temperature, comprising: a. a cylinder containing Freon under pressure; b. a horn, activated by Freon under pressure; c. temperature sensitive passage means, isolating said horn from said cylinder when the ambient temperature is below said alarm temperature, and providing a connecting passage between said horn and said cylinder when the ambient temperature attains said alarm temperature; d. said passage means containing an activator and a heat collector in contiguous heat transfer relationship, and thermally insulated from all other elements of the apparatus; e. said activator having a base portion in thermal contact with said heat collector, and having a cup portion normally housing a eutectic metal; f. said cup portion having walls which angle outward from said base portion and combining with said base portion to define a truncated cone, said walls having a thickness less than the thickness of said activator base; g. said base having a centrally located aperture therein for communicating Freon pressure to the eutectic material in said cup; and, h. said eutectic material being normally bonded to the inside of said cup at temperatures below said predetermined temperature, said bond disintegrating at said predetermined temperature such that said Freon pressure communicated to said eutectic material expels it from said cup, thereby providing a through passageway from said cylinder to said horn when the ambient temperature attains said alarm temperature.
Claim 3
Dependent Claim
58 words
The apparatus as described in claim 1 wherein said passage assembly comprises a bottom flange adapter, a heat collector washer, said activator disc, said heat collector, an upper head washer, and a top flange adapter, such elements being connected to each other in the order as stated herein, and secured in place by screws engaging all said elements.
Claim 4
Dependent Claim
28 words
The apparatus as described in claim 2, wherein said heat collector comprises a disc of diameter greater than said base portion, and has a plurality of openings therein.
Claim 5
Dependent Claim
29 words
The apparatus as described in claim 3, wherein said activator base portion is a disc, and the outside junction between said activator disc and said cup walls is rounded.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |