Patent US3745545A successfully refreshed from Google Patents.
US3745545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature limit alarm
Assignee: Individual
•
Filing: 1972-05-15
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Granted: 1973-07-10
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Expires: 1992-05-15
Abstract
Abstract A bimetal temperature responsive coil exposed to ambient atmosphere is connected at its fixed inner end to one battery terminal and adjustable contact elements in the form of arches enclosing a lamp are connected to the other terminal to be contacted by the tail of the coil as it moves in response to temperature change to either the lower or the upper limit.
Inventors
- 👤 R Darbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:53
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18; G08B21/182
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
190 words
In a temperature limit alarm which includes an alarm signal device and a battery operatively connected thereto through an ambient temperature responsive control switching structure, the improvement wherein the switching structure comprises a conductive open-topped cylindrical housing connected with one terminal of the battery and having an inturned flange defining a circular opening in the top thereof, a nonconductive disk arranged in said housing to close said opening, a hollow column mounted in and extending coaxially through and above said disk, a bimetal coil arranged concentrically upon said column with its inner end fastened to and electrically connected with said column, said column being adapted to support an alarm signal device thereabove, an arch-shaped conductive bar clamped at its ends between said disk and said inturned flange and rising above said coil and leaving space therebelow for an alarm signal device, said bar being located for electrical contact engagement by the free end of said coil, and means for electrically connecting said column with one terminal of an alarm signal device and the other terminal of the battery through said hollow column with the other terminal of said signal device.
Claim 2
Dependent Claim
190 words
In a temperature limit alarm which includes an alarm signal device and a battery operatively connected thereto through an ambient temperature responsive control switching structure, the improvement wherein the switching structure comprises a conductive open-topped cylindrical housing connected with one terminal of the battery and having an inturned flange defining a circular opening in the top thereof, a nonconductive disk arranged in said housing to close said opening, a hollow column mounted in and extending coaxially through and above said disk, a bimetal coil arranged concentrically upon said column with its inner end fastened to and electrically connected with said column, said column being adapted to support an alarm signal device thereabove, an arch-shaped conductive bar clamped at its ends between said disk and said inturned flange and rising above said coil and leaving space therebelow for an alarm signal device, said bar being located for electrical contact engagement by the free end of said coil, and means for electrically connecting said column with one terminal of an alarm signal device and the other terminal of the battery through said hollow column with the other terminal of said signal device.
Claim 3
Dependent Claim
174 words
A temperature limit alarm comprising a conductive cylindrical housing containing a battery having a central positive terminal at its top, said housing having an inturned flange defining a circular opening at its top end, a nonconductive disk arranged in said housing to close said opening, a threaded lamp socket sleeve mounted in and extending coaxially through and above said disk, a central termiNal lamp in said socket with said terminal in contact with said central terminal of said battery, a bimetal coil arranged concentrically upon said socket sleeve with its inner end fastened to and electrically connected with said socket sleeve, an arch-shaped conductive bar clamped at its ends between said disk and said inturned flange and rising above said coil and said lamp, said bar being located for electrical contact engagement by the free end of said coil, and a coil spring arranged in the bottom of said housing to electrically connect the negative terminal of said battery with said housing and press said battery upwardly against said central terminal of said lamp.
Claim 4
Dependent Claim
174 words
A temperature limit alarm comprising a conductive cylindrical housing containing a battery having a central positive terminal at its top, said housing having an inturned flange defining a circular opening at its top end, a nonconductive disk arranged in said housing to close said opening, a threaded lamp socket sleeve mounted in and extending coaxially through and above said disk, a central termiNal lamp in said socket with said terminal in contact with said central terminal of said battery, a bimetal coil arranged concentrically upon said socket sleeve with its inner end fastened to and electrically connected with said socket sleeve, an arch-shaped conductive bar clamped at its ends between said disk and said inturned flange and rising above said coil and said lamp, said bar being located for electrical contact engagement by the free end of said coil, and a coil spring arranged in the bottom of said housing to electrically connect the negative terminal of said battery with said housing and press said battery upwardly against said central terminal of said lamp.
Claim 5
Dependent Claim
20 words
Structure in accordance with claim 2 wherein the contact surface of the free end of the coil is nickel plated.
Claim 6
Dependent Claim
13 words
Structure in accordance with claim 3 wherein the arch-shaped bar is nickel plated.
Claim 7
Dependent Claim
29 words
Structure in accordance with claim 2 wherein the arch-shaped bar is frictionally held in position and is adjustable with respect to its position at the periphery of the disk.
Claim 8
Dependent Claim
26 words
Structure in accordance with claim 5 wherein the disk is provided with temperature degrees indicia whereby the bar may be adjusted to a particular ambient temperature.
Claim 9
Dependent Claim
36 words
Structure in accordance with claim 2 and including a second arch-shaped bar also arranged for electrical contact engagement with the end of the coil whereby to provide for both high temperature and low temperature limit alarms.
Claim 10
Dependent Claim
30 words
Structure in accordance with claim 7 wherein both arch-shaped bars are frictionally held in position and are independently adjustable with respect to their positions at the periphery of the disk.
Claim 11
Dependent Claim
26 words
Structure in accordance with claim 7 wherein the two arch-shaped bars are pivotally connected to each other where they cross at the axis of the housing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |