Patent US3772671A successfully refreshed from Google Patents.
US3772671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm
Assignee: Individual
•
Filing: 1972-05-22
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Granted: 1973-11-13
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Expires: 1992-05-22
Abstract
Abstract A fire alarm system for buildings, especially dwellings, including a pressurized conduit extending through substantially all parts of a building and which includes fusible parts responsive to heat, such as that caused by a fire, for releasing the pressure from the conduit, to release a distended diaphragm which is connected to the conduit system. Release of the diaphragm permits movement of a detent rod, connected thereto, to a position for releasing a clock mechanism for mechanically producing an audible alarm. Release of the clock mechanism effects release of an electric switch which is spring biased to a circuit closing position for energizing electrical alarms which may constitute lights or audible alarms and which may additionally function as a visual indicator to indicate that the alarm has been inadvertently activated.
Inventors
- 👤 W Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:36
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
A fire alarm system comprising a pressurized conduit system including a distended diaphragm, said conduit system having fusible parts for releasing the pressure from the system in response to heat, such as that caused by a fire, an alarm, an alarm actuating mechanism, a detent member carried by said diaphragm and maintained by the distended diaphragm in a position to prevent operation of the alarm actuating mechanism, said detent being movable with the diaphragm to a position to release the alarm mechanism for actuation when the conduit system is depressurized, a compression spring moving the diaphragm and detent to a position for releasing the alarm actuating mechanism, said alarm actuating mechanism comprising a part of a mechanical clock mechanism including a rotatable shaft, an electric circuit having an electrical alarm interposed therein and including an electric switch, said switch including a contact normally spring biased to a circuit closing position, and an arm carried by said shaft for holding said contacT in a circuit breaking position until said detent member is moved to a released position permitting rotation of the shaft.
Claim 2
Dependent Claim
181 words
A fire alarm system comprising a pressurized conduit system including a distended diaphragm, said conduit system having fusible parts for releasing the pressure from the system in response to heat, such as that caused by a fire, an alarm, an alarm actuating mechanism, a detent member carried by said diaphragm and maintained by the distended diaphragm in a position to prevent operation of the alarm actuating mechanism, said detent being movable with the diaphragm to a position to release the alarm mechanism for actuation when the conduit system is depressurized, a compression spring moving the diaphragm and detent to a position for releasing the alarm actuating mechanism, said alarm actuating mechanism comprising a part of a mechanical clock mechanism including a rotatable shaft, an electric circuit having an electrical alarm interposed therein and including an electric switch, said switch including a contact normally spring biased to a circuit closing position, and an arm carried by said shaft for holding said contacT in a circuit breaking position until said detent member is moved to a released position permitting rotation of the shaft.
Claim 3
Dependent Claim
51 words
A fire alarm system as in claim 1, said mechanical clock mechanism including an oscillating escapement member, a hammer carried thereby, and a gong disposed to be sounded by engagement of the hammer therewith when the detent member is moved out of engagement with the hammer to release the clock mechanism.
Claim 4
Dependent Claim
33 words
A fire alarm system as in claim 1, said electrical alarm including visual alarms so located as to provide illumination for the escape of occupants of a building in case of a fire.
Claim 5
Dependent Claim
38 words
A fire alarm system as in claim 1, at least one of said electrical alarms comprising a visual alarm disposed to additionally function as a warning light to indicate when the alarm actuating mechanism has been inadvertently released.
Claim 6
Dependent Claim
26 words
A fire alarm system as in claim 1, and means for visually indicating when the conduit system is fully pressurized and the diaphragm is fully distended.
Claim 7
Dependent Claim
25 words
A fire alarm system as in claim 1, said conduit system including an elastic section capable of expanding and contracting to compensate for temperature variations.
Claim 8
Dependent Claim
25 words
A fire alarm system as in claim 1, said fusible parts comprising plugs located in different parts of a building containing the fire alarm system.
References Cited (Backward Citations)
US1219723A
Cited
US1620062A
Cited
US2085807A
Cited
US2781769A
Cited
US2880690A
Cited
US3014206A
Cited
US3072758A
Cited
US3105127A
Cited
US3147735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |