US3779004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fusible link
Assignee: GRUNAU SPRINKLER MANUFACTURING COMPANY Inc A WIS CORP
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Filing: 1972-09-12
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Granted: 1973-12-18
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Expires: 1992-09-12
Abstract
Abstract A fusible link is provided suitable for use for controlling a weight release, for a door closer or for a sprinkler, which can be used in tension or compression, and which includes two link elements one interengaged with the other and held against movement by a transverse fusible temperature responsive retainer.
Inventors
- 👤 F Gloeckler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:32
CPC Classifications
F; F16; F16G; F16G15/00; F16G15/04; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45461
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A fusible link comprising a first link portion having an opening therethrough, a second link portion having an integral staple extending therethrough, and a transverse strut diSposed within said staple and in engagement therewith and with said first link portion, said transverse strut having therein a portion of eutectic alloy with a predetermined melting temperature normally holding said strut in place but being collapsible upon melting of said eutectic alloy.
Claim 2
Dependent Claim
70 words
A fusible link comprising a first link portion having an opening therethrough, a second link portion having an integral staple extending therethrough, and a transverse strut diSposed within said staple and in engagement therewith and with said first link portion, said transverse strut having therein a portion of eutectic alloy with a predetermined melting temperature normally holding said strut in place but being collapsible upon melting of said eutectic alloy.
Claim 3
Dependent Claim
37 words
A fusible link as defined in claim 1 in which said first link portion has a flat body in which said opening is located, said second link portion has a flat body from which said staple extends.
Claim 4
Dependent Claim
37 words
A fusible link as defined in claim 2 in which said body of said second link portion is disposed in face to face relation to the body of said first link portion on one side face thereof.
Claim 5
Dependent Claim
26 words
A fusible link as defined in claim 3 in which said staple has an extension in engagement with said side face of said first link portion.
Claim 6
Dependent Claim
27 words
A fusible link as defined in claim 1 in which said strut has ends in engagement with said first link portion at opposite sides of said opening.
Claim 7
Dependent Claim
43 words
A fusible link as defined in claim 1 in which said opening has end margins, and said staple has an outer face portion for camming engagement with one of said end margins upon release of said strut by melting of said eutectic alloy.
Claim 8
Dependent Claim
45 words
A fusible link as defined in claim 1 in which said staple is of lesser width than said opening, and said strut is of greater width than said opening and is normally engaged with said first link portion at the side margins of said opening.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |