US3786461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm device
Assignee: CONS COAL CO
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Filing: 1971-10-12
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Granted: 1974-01-15
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Expires: 1991-10-12
Abstract
Abstract A fire alarm device including thermostat means operably connected to conductor means whereby a fire condition may activate the thermostat for providing a signal current to activate an alarm in electrical connection with the thermostat. The thermostat includes a normally open switch means having a pair of downwardly depending conducting elements extending therefrom. Each member of the pair of conducting elements is adapted to contact in electrically conducting fashion a member of a pair of current carrying conductors whereby closing of the switch due to exposure to fire may activate an alarm. In a preferred instance the conducting elements are in contact with a pair of barb-bearing electrical contacts in a hinged, channel forming receptacle. Closing of the receptacle about its hinge over a conventional electrical cord including a pair of current carrying wires forces the barbs into mechanical and electrical contact with the wires. In that fashion, the thermostat means is rapidly and efficiently operably contacted with the wires. Each hinged, channel formed receptacle includes means, such as bores, therein through which testing means, such as electrical leads to a voltmeter or the like, may be inserted for testing the connection between a fire alarm device and current carrying wires. Additionally, a fire alarm system is provided including a plurality of the foregoing fire alarm devices connected in parallel along a length of conduit and including appropriate alarm devices therefor.
Inventors
- 👤 W Jamison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:21
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06; H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
234 words
A fire alarm switch adapted to be electrically connected in parallel between a pair of electrical conductors in a twoconductor wire comprising, a thermostat operably connected to an electrical receptacle, said thermostat having a normally open electrical switch operably connected to heat sensitive means whereby exposure of said thermostat to a predetermined temperature will close said switch, said electrical switch including a pair of electrically conductive elements extending therefrom into said electriCal receptacle, said electrical receptacle having a channel forming receptacle including base and closure members adapted to be fitted together for forming a transverse channel therethrough for receiving and holding a two-conductor wire, said electrical receptacle including a pair of barb-bearing electrically conductive contacts, each one of said pair of barb-bearing contacts adapted to mechanically and electrically contact one of said conductors in said two-conductor wire when said base and closure members are fitted together over a twoconductor wire positioned in said transverse channel therebetween, said electrically conductive elements extending from said electrical switch in electrical contact with said barb-bearing contacts, and said fire alarm switch including a pair of spaced openings in said electrical receptacle positioned on the opposite side of said electrical receptacle from said thermostat for receiving separate portions of a testing device for testing the electrical connections between said electrically conductive elements extending from said switch, said barb-bearing contacts, and the connection between said barb-bearing contacts and said conductors.
Claim 2
Dependent Claim
234 words
A fire alarm switch adapted to be electrically connected in parallel between a pair of electrical conductors in a twoconductor wire comprising, a thermostat operably connected to an electrical receptacle, said thermostat having a normally open electrical switch operably connected to heat sensitive means whereby exposure of said thermostat to a predetermined temperature will close said switch, said electrical switch including a pair of electrically conductive elements extending therefrom into said electriCal receptacle, said electrical receptacle having a channel forming receptacle including base and closure members adapted to be fitted together for forming a transverse channel therethrough for receiving and holding a two-conductor wire, said electrical receptacle including a pair of barb-bearing electrically conductive contacts, each one of said pair of barb-bearing contacts adapted to mechanically and electrically contact one of said conductors in said two-conductor wire when said base and closure members are fitted together over a twoconductor wire positioned in said transverse channel therebetween, said electrically conductive elements extending from said electrical switch in electrical contact with said barb-bearing contacts, and said fire alarm switch including a pair of spaced openings in said electrical receptacle positioned on the opposite side of said electrical receptacle from said thermostat for receiving separate portions of a testing device for testing the electrical connections between said electrically conductive elements extending from said switch, said barb-bearing contacts, and the connection between said barb-bearing contacts and said conductors.
Claim 3
Dependent Claim
21 words
The fire alarm switch as set forth in claim 1 wherein said heat sensitive means includes a heat distortable metallic composition.
Claim 4
Dependent Claim
75 words
The fire alarm switch as set forth in claim 1 wherein said electrical switch includes a pair of electrically conductive metallic strips extending from within to without said thermostat, and wherein the portions of said metallic strips within said thermostat are bent inwardly toward each other whereby said strips are normally spaced apart and whereby exposure of said thermostat to said predetermined temperature results in contact of said portions of said strips within said thermostat.
Claim 5
Dependent Claim
27 words
The fire alarm switch as set forth in claim 1 wherein said electrically conductive elements extending from said electrical switch are permanently affixed to said barb-bearing contacts.
Claim 6
Dependent Claim
21 words
The fire alarm switch as set forth in claim 4 wherein said electrically conductive elements are welded to said barb-bearing contacts.
Claim 7
Dependent Claim
34 words
The fire alarm switch as set forth in claim 1 wherein said pair of openings extend into said electrical receptacle on opposite sides of said transverse channel for receiving and holding a two-conductor wire.
Claim 8
Dependent Claim
26 words
The fire alarm switch as set forth in claim 2 including an electrically nonconductive pin disposed between said heat distortable metallic composition and said electrical switch.
Claim 9
Dependent Claim
32 words
The fire alarm switch as set forth in claim 1 including a thin metallic plate operably mounted on said thermostat whereby heat on said plate may be efficiently conducted to said thermostat.
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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 |