Patent US3725972A successfully refreshed from Google Patents.
US3725972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire link and method of actuating same
Assignee: Individual
•
Filing: 1971-09-07
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Granted: 1973-04-10
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Expires: 1991-09-07
Abstract
Abstract A releasable link is provided to open under predetermined conditions; said link having the capacity to be reset under predetermined temperature conditions. The link includes a bimetallic element for effecting opening and closing. The link may also include heating means for actuating the bimetallic element, and secondary circuit control means for actuating signals or controlling current to the heating means.
Inventors
- 👤 Cabe F Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
F; F24; F24F; F24F11/00; F16; F16G; F16G15/00; F16G15/04; F16G15/12; F24F11/30; F24F11/32; F24F11/33; F24F11/35; F24F11/50; F24F11/56; G; G08; G08B; G08B17/00; G08B17/06; H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; F24F2110/00; F24F2110/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
51 words
A releasable link having only two elements comprising: a first element; and a separate heat activated bimetallic second element not fixedly connected to, but directly engaged with said first element and coacting therewith to allow said elements to separate in response to temperature change without changing the state of either element.
Claim 2
Dependent Claim
51 words
A releasable link having only two elements comprising: a first element; and a separate heat activated bimetallic second element not fixedly connected to, but directly engaged with said first element and coacting therewith to allow said elements to separate in response to temperature change without changing the state of either element.
Claim 3
Dependent Claim
22 words
The invention of claim 1 wherein a remotely controlled heating means is connected to said bimetallic element for actuating said bimetallic element.
Claim 4
Dependent Claim
18 words
The invention of claim 2 wherein said heating means compRises an electric heating element engaging said bimetallic element.
Claim 5
Dependent Claim
20 words
The invention of claim 1 wherein a pin is attached to said bimetallic element and passes through said first element.
Claim 6
Dependent Claim
28 words
The invention of claim 4 wherein said bimetallic element is fixedly connected to a base at one end and said pin is connected to the free end thereof.
Claim 7
Dependent Claim
19 words
The invention of claim 4 wherein said second element includes a means embracing said first element to confine it.
Claim 8
Dependent Claim
21 words
The invention of claim 1 wherein said second element is provided with means to provide an air passage to the bimetal.
Claim 9
Dependent Claim
19 words
The invention of claim 1 wherein said electrical means are connected to said bimetallic element for heating said element.
Claim 10
Dependent Claim
18 words
The invention of claim 8 wherein said electrical means comprises electrical leads directly connected to said bimetallic element.
Claim 11
Dependent Claim
47 words
The invention of claim 8 wherein said electrical means comprise heating means and a pair of electrical contacts attached to said link, one of said contacts being connected to said bimetallic element, whereby as said bimetallic element moves in response to heat, said contact moves with it.
Claim 12
Dependent Claim
21 words
The invention of claim 1 wherein electrical means are provided attached to said link to signal the release of said elements.
Claim 13
Dependent Claim
15 words
The invention of claim 11 wherein said electrical means comprises a pair of electrical contacts.
Claim 14
Dependent Claim
19 words
The invention of claim 12 wherein one of said contacts is connected to and moves with said bimetallic element.
Claim 15
Dependent Claim
39 words
In a method of actuating a fire link to release the link elements from their engaged condition, the improvement comprising: electrically heating said link to control the engagement of said link elements without changing the state of the link.
Claim 16
Dependent Claim
39 words
In a method of actuating a fire link to release the link elements from their engaged condition, the improvement comprising: electrically heating said link to control the engagement of said link elements without changing the state of the link.
Claim 17
Dependent Claim
42 words
In the method of claim 14 applied to a link having a bimetallic element to control the engagement of said link elements, the improvement comprising: remotely supplying electrical current directly to said bimetallic element to heat said element to control said engagement.
Claim 18
Dependent Claim
24 words
The invention of claim 15, wherein said current is continuously supplied to said bimetallic element to retain said link elements in their engaged condition.
Claim 19
Dependent Claim
20 words
In the method of claim 15 automatically controlling the current supplied in response to the position of the bimetallic element.
Claim 20
Dependent Claim
14 words
In the method of claim 14 automatically electrically signalling the release of said elements.
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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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |