Patent US3590924A successfully refreshed from Google Patents.
US3590924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual nozzle sprinkler head
Assignee: Factory Mutual Research Corp
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Filing: 1968-12-24
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Granted: 1971-07-06
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Expires: 1988-12-24
Abstract
Abstract Method and apparatus for dispersing a fire extinguishant in which dual nozzles are employed in each sprinkler head to form separately a fine mist for cooling and a spray of coarse droplets to penetrate a fire plume and reach fuel surfaces to extinguish a fire.
Inventors
- 👤 Howard W Emmons
- 👤 Cheng Yao
- 👤 James B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:18
CPC Classifications
A; A62; A62C; A62C37/00; A62C37/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A sprinkler head for fixed fire-extinguishing systems, said head comprising: a fitting having an inlet for connection to a source of extinguishant and at least two outlets, first discharge means in one of said outlets to disperse a finely divided spray of extinguishant, second discharge means in the other of said outlets to disperse relatively large droplets of extinguishant, and temperature-responsive means to actuate said first and second discharge means.
Claim 2
Dependent Claim
70 words
A sprinkler head for fixed fire-extinguishing systems, said head comprising: a fitting having an inlet for connection to a source of extinguishant and at least two outlets, first discharge means in one of said outlets to disperse a finely divided spray of extinguishant, second discharge means in the other of said outlets to disperse relatively large droplets of extinguishant, and temperature-responsive means to actuate said first and second discharge means.
Claim 3
Dependent Claim
28 words
The apparatus recited in claim 1 including means for supplying extinguishant from said inlet to said second discharge means at a lower pressure than said first discharge means.
Claim 4
Dependent Claim
30 words
The apparatus recited in claim 2 wherein said means for supplying extinguishant from said inlet to said second discharge means comprises means establishing a restricted orifice in said other outlet.
Claim 5
Dependent Claim
23 words
The apparatus recited in claim 1 wherein said temperature-responsive means comprises separate fuse elements for each of said first and second discharge means.
Claim 6
Dependent Claim
30 words
The apparatus recited in claim 4 wherein the fuse element for said first discharge means is releasable at a lower temperature than the fuse element for said second discharge means.
Claim 7
Dependent Claim
43 words
The apparatus recited in claim 1 comprising a valve member normally blocking said inlet, said valve member being movable under the control of said temperature-responsive means to an open position establishing fluid communication between said inlet and said first and second discharge means.
Claim 8
Dependent Claim
75 words
In a fixed fire-extinguishing system of the type in which an extinguishant is supplied to automatically actuated sprinkler heads located in a space to be protected, a plurality of coarse spray nozzles to develop one extinguishant spray of droplets having a size capable of penetrating a rising plume of combustion products, and a plurality of fine spray nozzles to develop another extinguishant spray of fine droplets which readily evaporate and cool ambient atmosphere upon activation.
Claim 9
Dependent Claim
75 words
In a fixed fire-extinguishing system of the type in which an extinguishant is supplied to automatically actuated sprinkler heads located in a space to be protected, a plurality of coarse spray nozzles to develop one extinguishant spray of droplets having a size capable of penetrating a rising plume of combustion products, and a plurality of fine spray nozzles to develop another extinguishant spray of fine droplets which readily evaporate and cool ambient atmosphere upon activation.
Claim 10
Dependent Claim
28 words
The apparatus recited in claim 7 wherein both said coarse spray nozzles and said fine spray nozzles are included in each of a plurality of sprinkler head units.
Claim 11
Dependent Claim
19 words
The apparatus recited in claim 7 including separate means for supplying extinguishant to said fine and coarse nozzles respectively.
Claim 12
Dependent Claim
68 words
The apparatus recited in claim 7 including first means automatically responsive to a fire in said space for controlling the opening of said coarse spray nozzles, and second means automatically responsive to a fire in said space for controlling the opening of said fine spray nozzles, said second means opening said fine spray nozzles in advance of the opening of said coarse spray nozzles by said first means.
Claim 13
Dependent Claim
43 words
The apparatus recited in claim 10 wherein said coarse and fine spray nozzles and said first and second means are included in each of a plurality of sprinkler head units, said first and seconds means being responsive to heat generated by the fire.
References Cited (Backward Citations)
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |