US3931785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic fire alarm
Assignee: Individual
•
Filing: 1974-11-18
•
Granted: 1976-01-13
•
Expires: 1994-11-18
Abstract
Abstract This device comprises an audible alarm member arranged to be sounded by spring operated clapper means which is normally held inoperative by temperature responsive devices all in a perforated housing suitable for installation in a room. The temperature responsive devices include a body of wax like material disposed between two cup shaped members of good heat conductive material and holding said members apart at all ordinary room temperatures. If the temperature surrounding the device is raised to a predetermined limit, as by a fire in the room, the wax body will soften or melt and this will permit the cup shaped members to be moved and cause the alarm to be sounded.
Inventors
- 👤 James R. Keeley
- 👤 Russell Everson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
In fire alarm means, a frame; a sound producing device; a pivotally mounted arm capable, when oscillated, of sounding said sound producing device; spring actuated arm oscillating means connected with said arm; a cup shaped member rigidly supported from said frame; another cup shaped member rigidly supported by said arm, said two cup shaped members being formed of material having good heat conducting characteristics and being positioned close together with their concave sides in opposed relation; and a body of heat responsive material which is firm at normal room temperatures and has a melting temperature substantially in excess of normal room temperature, interposed between and filling said cup shaped members, said body holding said cup shaped members apart at normal room temperatures and softening and bringing about oscillation of said arm and sounding of said sound producing devices when subjected to a temperature substantially in excess of normal room temperature.
Claim 2
Dependent Claim
150 words
In fire alarm means, a frame; a sound producing device; a pivotally mounted arm capable, when oscillated, of sounding said sound producing device; spring actuated arm oscillating means connected with said arm; a cup shaped member rigidly supported from said frame; another cup shaped member rigidly supported by said arm, said two cup shaped members being formed of material having good heat conducting characteristics and being positioned close together with their concave sides in opposed relation; and a body of heat responsive material which is firm at normal room temperatures and has a melting temperature substantially in excess of normal room temperature, interposed between and filling said cup shaped members, said body holding said cup shaped members apart at normal room temperatures and softening and bringing about oscillation of said arm and sounding of said sound producing devices when subjected to a temperature substantially in excess of normal room temperature.
Claim 3
Dependent Claim
24 words
The fire alarm device as claimed in claim 1 in which the melting temperature of the heat responsive body is between 130° and 140°F.
Claim 4
Dependent Claim
22 words
The fire alarm device as claimed in claim 1 in which the melting temperature of the heat responsive body is about 135°F.
Claim 5
Dependent Claim
22 words
The fire alarm device as claimed in claim 1 in which the heat responsive body is composed of wax derived from petroleum.
References Cited (Backward Citations)
US2625902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |