US3623050A - Electric source devices for fire alarm systems - Google Patents

Electric source devices for fire alarm systems Download PDF

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Publication number
US3623050A
US3623050A US3623050DA US3623050A US 3623050 A US3623050 A US 3623050A US 3623050D A US3623050D A US 3623050DA US 3623050 A US3623050 A US 3623050A
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US
United States
Prior art keywords
source
fire
alarm
line terminals
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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English (en)
Inventor
Atsuhiro Kojima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SCM-P&S Inc
Nittan Co Ltd
Original Assignee
Nittan Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of US3623050A publication Critical patent/US3623050A/en
Assigned to SCM-P&S, INC. reassignment SCM-P&S, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCM CORPORATION, A NY. CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch

Definitions

  • U s 340,228 I ABSTRACT A fire alarm system uses a detector operated O n f a regulated voltage supply maintains the sensitivi- 340/227340/256 340/2lO3l7/l32 307/86 ty of the detector and switches to an unregulated voltage 307/ 179/5 supply whenever a fire is detected to supply the energizing 22 539 current for audible and visual alarm indicators.
  • the stabilized source is required to have sufi 'rcient capacity to satisfactorily operate the fire alarm system when a fire occurs. For this reason the source for a fire alarm system is required not only to be stable but also to have a large capacity, thus increasing the cost thereof.
  • THe object of this invention is to decrease the capacity of i the source.
  • a fire alarm system comprising a fire sensing means including a fire responsive ,4 element which senses a fire hazard by varying the voltage thereacross and a fire indicating means, and a receiver including a stabilized source for supervision, means to receive a signal from said fire sensing means and a fire alarm means, there is provided an electric source device characterized in that upon occurrence of a fire hazard said signal receiving means operates to disconnect the stabilized source from the fire sensing means and to connect an independent source to the fire indicating means and to the fire alarm means.
  • FIG. 1 shows a connection diagram of one example of an electric source device for a fire alarm system embodying this invention and F IG. 2 shows a modified embodiment of the electric source device for use in a receiver.
  • FIG. 1 shows a circuit diagram of a fire alarm system embodying this invention and comprising a fire sensing means A, a receiver B and supply lines l and F interconnecting them.
  • Fire sensing means A comprises a fire responsive element T which may be an ionization chamber, for example, connected to supply lines I and F at its terminals 1 and 2, respectively, a controlled rectifier S with one terminal connected to line I', and a parallel combination of a lamp L1 and a protective resistor R1 connected between the other terminal of the controlled rectifier and line F.
  • a fire responsive element T which may be an ionization chamber, for example, connected to supply lines I and F at its terminals 1 and 2, respectively, a controlled rectifier S with one terminal connected to line I', and a parallel combination of a lamp L1 and a protective resistor R1 connected between the other terminal of the controlled rectifier and line F.
  • Receiver B comprises a stabilized source E3 adapted to normally supply a stabilized voltage for supervision across lines I and F via a relay contact b2 and a relay G which receives a signal from the fire alarm system in a manner to be described later, and a series circuit connected across lines I and F and including a normally opened relay contact k3, a resistor R2, a push button P1 and a source E2 for said pilot lamp L1.
  • the receiver also includes a source El for energizing relay circuits and an alarm device.
  • a series circuit including an alarm buzzer b and a normally opened contact h5 and series circuit including an alarm lamp L2 and a normally opened contact H4 are respectively connected across source El.
  • alarming relay H is provided with its one end connected to the negative terminal of source El and the other end to parallel connected normally opened contacts hl and g.
  • a push button P2 interlocked with said push button Pl is included as shown. it is to be understood that contacts hl through I are operated by the alarming relay H while contact g is operated said receiver relay G.
  • the fire alarm system operates as follows:
  • Opening of contact b2 and closure of contact 123 transfers the source for pilot lamp L] of the fire detecting means A from source E3 to source E2 thus continuing the lighting of the pilot lamp Ll.
  • Contact '12 and k3 are designed to operate such that contact k3 is closed before opening contact h2, thus assuring continuous energization of the fire detecting means A. Closure of contacts I14 and its results in the energization of buzzer b and alarm lamp L2 from source El.
  • source E2 is required to have a capacity only sufficient to maintain the controlled rectifier S in the fire detecting means A in the conductive state and to light pilot lamp Ll.'ln addition, the source E2 should have a sufficiently flat voltage.
  • source El may be a direct current source which may fluctuate to some extent so long as it can continuously operate alarm relay H.
  • FIG. 2 illustrates a modified construction of the receiver which is identical to that shown in FIG. 1 except that a single source E2 is utilized for energizing both pilot lamp L1 and the alarm device in the receiver. However, since the modification shown in FIG. 2 operates in the same manner as that shown in FIG. 1, it is believed unnecessary to describe it again.
  • the stabilized source is used only to sense the occurrence of the fire hazard and this source is automatically switched to other source for providing indication and alarm of the fire so that the stabilized source is required to have a small capacity only sufficient to supply a small current during normal supervision.
  • the current required for normal supervision is small a plurality of fire alarm systems can be connected to a single stabilized source.
  • this invention makes it possible to greatly reduce the capacity of the stabilized source which is required to operate a sensitive fire detecting element in the fire alarm system.
  • a supervisory fire alarm system comprising:
  • a fire sensing station having a pair of line terminals normally substantially open circuited and across which are connected an ionization chamber and a signal controlled rectifier responsive to detection current flow in said ionization chamber to conduct current between said line terminals; a receiving station connected to said line terminals of said fire sensing station and including a stabilized voltage source, current responsive means, and a circuit connecting said source through said current responsive means to said line terminals to supply stabilized operating voltage from said source to said ionization chamber and said controlled rectifier;
  • an alarm relay with latching contacts connected to said power source
  • switch contacts operated upon energizing said alarm relay to supply current to said line terminals from said power source and to disconnect said stabilized voltage source from said line terminals.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Emergency Alarm Devices (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Fire-Detection Mechanisms (AREA)
US3623050D 1967-11-25 1968-11-19 Electric source devices for fire alarm systems Expired - Lifetime US3623050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9866667U JPS4518177Y1 (enExample) 1967-11-25 1967-11-25

Publications (1)

Publication Number Publication Date
US3623050A true US3623050A (en) 1971-11-23

Family

ID=14225818

Family Applications (1)

Application Number Title Priority Date Filing Date
US3623050D Expired - Lifetime US3623050A (en) 1967-11-25 1968-11-19 Electric source devices for fire alarm systems

Country Status (6)

Country Link
US (1) US3623050A (enExample)
JP (1) JPS4518177Y1 (enExample)
BE (1) BE724390A (enExample)
FR (1) FR1597628A (enExample)
GB (1) GB1253977A (enExample)
NL (1) NL6816468A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686475A (en) * 1971-03-04 1972-08-22 Gen Motors Corp Control circuit for a liquid vaporizing tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5637597B2 (enExample) * 1973-02-28 1981-09-01
JPS516304U (enExample) * 1974-07-03 1976-01-17

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US524374A (en) * 1894-08-14 Charles bernhardt
US2769121A (en) * 1953-08-13 1956-10-30 Mcdermott Controls Inc Electrical instruments
US3225341A (en) * 1964-01-20 1965-12-21 Potter Electric Signal Company Signalling apparatus including remote battery recharging system
US3258758A (en) * 1966-06-28 Two-level threshold detectors
US3396386A (en) * 1965-11-08 1968-08-06 Honeywell Inc Radiation detecting apparatus with self-check
US3500394A (en) * 1966-12-23 1970-03-10 Honeywell Inc Control apparatus
US3521276A (en) * 1967-04-06 1970-07-21 Pyrotronics Inc Supervised alarm circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US524374A (en) * 1894-08-14 Charles bernhardt
US3258758A (en) * 1966-06-28 Two-level threshold detectors
US2769121A (en) * 1953-08-13 1956-10-30 Mcdermott Controls Inc Electrical instruments
US3225341A (en) * 1964-01-20 1965-12-21 Potter Electric Signal Company Signalling apparatus including remote battery recharging system
US3396386A (en) * 1965-11-08 1968-08-06 Honeywell Inc Radiation detecting apparatus with self-check
US3500394A (en) * 1966-12-23 1970-03-10 Honeywell Inc Control apparatus
US3521276A (en) * 1967-04-06 1970-07-21 Pyrotronics Inc Supervised alarm circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686475A (en) * 1971-03-04 1972-08-22 Gen Motors Corp Control circuit for a liquid vaporizing tool

Also Published As

Publication number Publication date
NL6816468A (enExample) 1969-05-28
JPS4518177Y1 (enExample) 1970-07-24
BE724390A (enExample) 1969-05-02
DE1810070B2 (de) 1972-08-24
DE1810070A1 (de) 1969-08-07
FR1597628A (enExample) 1970-06-29
GB1253977A (en) 1971-11-17

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SCM-P&S, INC., C/O HANSON INDUSTRIES 100 WOOD AVEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCM CORPORATION, A NY. CORP.;REEL/FRAME:004681/0977

Effective date: 19870204