US3785334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas generator fire alarm
Assignee: Individual
•
Filing: 1971-01-11
•
Granted: 1974-01-15
•
Expires: 1991-01-11
Abstract
Abstract A fire alarm is contained in a housing. There is a gas generator connected to a whistle. An ignitor starts the gas generator. More particularly, a fire alarm with a gas generator operated whistle noisemaker is actuated by excessive heat in the vicinity of the fire alarm.
Inventors
- 👤 T Waldeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:08
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
A fire alarm comprising: a. a housing, and therein, b. a gas generating means having a container having an outlet aperture and containing a quantity of an ignitable solid fuel gas generating compound, c. fuse means to ignite said gas generating means having an ignitable plug solid fuel member sealing said container outlet aperture and a solid and separable thermal fuse actuator directly connected to said plug fuel member, and d. whistle means communicably connected to said gas generating meAns container outlet, said means to ignite said gas generating means is adapted to be activated by said thermal fuse actuator being affected by excessive heat in the vicinity of said fire alarm, thereby causing said ignitable member to ignite and in turn causing said solid fuel gas generating compound to ignite said gas generating means to generate a gas which passes through said container outlet and through said whistle means producing a loud whistling noise.
Claim 2
Dependent Claim
155 words
A fire alarm comprising: a. a housing, and therein, b. a gas generating means having a container having an outlet aperture and containing a quantity of an ignitable solid fuel gas generating compound, c. fuse means to ignite said gas generating means having an ignitable plug solid fuel member sealing said container outlet aperture and a solid and separable thermal fuse actuator directly connected to said plug fuel member, and d. whistle means communicably connected to said gas generating meAns container outlet, said means to ignite said gas generating means is adapted to be activated by said thermal fuse actuator being affected by excessive heat in the vicinity of said fire alarm, thereby causing said ignitable member to ignite and in turn causing said solid fuel gas generating compound to ignite said gas generating means to generate a gas which passes through said container outlet and through said whistle means producing a loud whistling noise.
Claim 3
Dependent Claim
85 words
The fire alarm as described in claim 1, wherein: a. said container has an elongated cylindrical shape with said outlet aperture in one end thereof, b. said whistle means has a body member adapted to attach said container on said one end thereof over said outlet aperture, c. said fuse means has a striking member in contact with said ignitable member and movable thereacross to ignite same, and d. said striking member has means to move same from outside said container and said whistle means.
Claim 4
Dependent Claim
152 words
The fire alarm as described in claim 2, wherein: a. said housing has a mount member and a removable cover member, b. said mount member is adapted to hold said fire alarm on a supporting surface, said mount member is attached to said container member and said whistle member and has a spring means attached thereto adapted to move said striking member moving means and remove said removable cover member from said mount member, and c. said spring means has a first spring member attached said striking actuator moving means with said thermal fuse member attached said first spring member and said gas generating means to hold said first spring in a restrained condition, and a second spring member in a compressed condition positioned between said mount member and said first spring member adapted to when released by said first spring member strike said cover member removing same from said mount member.
Claim 5
Dependent Claim
126 words
The fire alarm as described in claim 3, wherein: a. said thermal fuse actuator is an elongated member and has a separable fuse portion therein said fuse portion is adapted to hold said first spring member in a fixed position in said restrained condition and release same for operation of said fire alarm, b. said separable fuse portion is a low melting point material adapted to separate when heated, c. said first spring member is a leaf spring member attached said mount member positioned therearound said whistle means having a curved end portion adapted to hold said second spring member, and d. said second spring member is a leaf spring member positioned alongside said gas generator means and said whistle means when in said compressed position.
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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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |