EP0019310A1 - Avertisseur d'incendie comportant un élément sensible à la température - Google Patents

Avertisseur d'incendie comportant un élément sensible à la température Download PDF

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Publication number
EP0019310A1
EP0019310A1 EP80200327A EP80200327A EP0019310A1 EP 0019310 A1 EP0019310 A1 EP 0019310A1 EP 80200327 A EP80200327 A EP 80200327A EP 80200327 A EP80200327 A EP 80200327A EP 0019310 A1 EP0019310 A1 EP 0019310A1
Authority
EP
European Patent Office
Prior art keywords
temperature
radiation
sensitive element
fire detector
detector according
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.)
Withdrawn
Application number
EP80200327A
Other languages
German (de)
English (en)
Inventor
Jürg Muggli
Peter Müller
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.)
Cerberus AG
Original Assignee
Cerberus AG
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
Application filed by Cerberus AG filed Critical Cerberus AG
Publication of EP0019310A1 publication Critical patent/EP0019310A1/fr
Withdrawn legal-status Critical Current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
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention relates to a fire detector with a temperature-sensitive element, which triggers an alarm signal if its predetermined critical temperature is exceeded.
  • Known fire detector which g is the Exceeding a certain air temperature which, for example, between 50 ° C and 100 ° C, may be in the vicinity of 70 ° C, preferably, utilize for alarm signaling, contain various temperature-sensitive elements which change their form at a temperature increase.
  • DE-PS 159 519 uses the length or volume expansion of contact thermometers or the deflection of bimetallic elements, which are composed of two layers of different thermal length expansion. From US 3 122 728 it is known to use the deflection of the wall of a chamber, in which a gas or air is enclosed, as a result of the pressure increase when the temperature rises.
  • the alarm signal is given either directly by the fact that a contact is closed by the mechanical movement of the temperature-sensitive element or indirectly by electromagnetic or optical transmission.
  • the alarm signal can be generated on or in the fire detector itself and consist of a visual or acoustic signal, or it can be an electrical signal, for example a change in current or voltage, which is forwarded to a signaling center via connecting lines.
  • fire detectors which act as sensors elements, temperature sensitive resistors or other temperature-sensitive components integrated included, wherein the A e shore the electrical properties, for example, is utilized in the resistance with an electronic evaluation circuit for alarm signaling.
  • This circuit can be designed such that it also only uses electrical switching elements to trigger this signal, for example thyristors or electronic switches. In this way, reliable alarm signaling can be achieved at a predetermined temperature, specifically in a manner that the alarm signal is not automatically reset when the temperature drops.
  • Such fire detectors are therefore not suitable for extensive fire alarm systems in which a large number of fire detectors are to be connected in parallel to the same lines, since in this case the sum of the quiescent currents can reach the magnitude of the alarm current of a single detector with just a few fire detectors and an alarm signal can no longer be safely distinguished from the quiescent currents of all detectors.
  • the invention has for its object to eliminate the disadvantages of known thermal fire detectors and in particular to provide a fire detector that can easily trigger a self-holding alarm signal without using a large number of components, which is not automatically reset when the temperature drops.
  • a detector should work reliably and trouble-free over long periods of time, show no signs of wear, require no frequent maintenance or adjustment, and maintain a critical temperature once selected.
  • this object is achieved in that the temperature-sensitive element has a shape memory alloy which returns to its impressed shape when the critical temperature is exceeded.
  • Shape memory alloys also as “shape memory alloys”, e.g. in US 3 174 851, 3 403 238, DE 1 288 363, 1 588 715, or in the Journal of Applied Physics 36, p.3232 ... (1965), have the property that they are used in the manufacture save selected geometric shape at elevated temperature. After the element has cooled below a critical temperature given by the material, the element can now be mechanically deformed. If the temperature is now raised again to the critical temperature, the material again assumes the original shape, irrespective of the way in which it was previously cold-formed. Up to a certain deformation, the change in shape can be freely selected.
  • Shape memory alloys that work according to the one-way principle have proven to be practical for most applications in fire detection technology.
  • the sensor element deforms back into its original shape when the critical temperature is reached. This shape remains intact and triggers a self-holding alarm signal, which can only be canceled by mechanical reshaping of the sensor element.
  • shape memory alloys that work according to the two-way principle have also proven to be useful for special applications. These alloys have the property that they do not return to their original shape after cold working when heated to the critical temperature. If the temperature drops again, the shape changes again in the sense of cold deformation when another lower threshold is reached. A fire detector with such a sensor element can therefore be reset by cooling to a lower threshold temperature after it has responded when the upper critical temperature has been reached.
  • Such hysteresis-like behavior is desirable if fire detectors with two different threshold values are desired. It is advisable to choose the lower threshold between the room temperature and the upper critical temperature. However, it can also be advantageous to choose the lower threshold below room temperature.
  • a fire detector has the property that it can be reset after cooling once below the lower threshold without mechanical action being required. This resetting can be achieved, for example, by a spray that is used in the De tector is sprayed and due to the evaporative cooling causes a cooling below room temperature.
  • a housing 2 is placed on a base plate 1, which has large openings 3 and 4 in the lower part for air to enter the interior of the housing.
  • a mounting plate 5 is provided, which carries two electrical connections 6 and 7, of which electrical lines, possibly via a base, lead to a signal device, not shown.
  • a strip 8 of a shape memory alloy is attached so that its other end is close to the formed as a counter contact 9 lower end of the other terminal 7.
  • the strip dimensions are not critical and can be, for example, 0.5 x 3 x 35 mm.
  • the strip 8 is made from one of the shape memory alloys mentioned above, preferably from a titanium / nickel alloy with added copper.
  • the alloy composition was chosen so that its critical temperature corresponds to the desired response temperature of the fire detector. This may for example be between 50 0 C and 100 0 C, preferably at 70 C.
  • the strip 8 at elevated temperature has been so formed that it initially has an elongated shape. When installed in the fire detector, it short-circuits connections 6 and 7 in this form. To operate the detector; to make ready, the strip 8 is deformed in the cold state to such an extent that it lifts off the counter-contact 9.
  • the change in shape can be up to 8% g if a one-way shape memory effect is desired, or 2% if the hysteresis or the two-way effect is used.
  • strip 8 heats up. In contrast to bimetal elements, strip 8 does not bend at first. Only when the predetermined critical temperature is exceeded, for example when 70 ° C. is reached, does a relatively rapid change in shape take place, in which the strip 8 again assumes the original elongated shape and touches the mating contact 9. An alarm signal is then triggered via the lines attached to the connections 6 and 7. As a result of the self-heating of the strip 8 by the current flowing through it, contacting is particularly reliable.
  • the advantage here is that the contact and alarm signal release takes place relatively quickly in a narrow temperature range. What occurs with previously known fire detectors Flutter caused by unsafe contact is avoided. In addition, the force exerted on the contacts is considerably greater than with detectors with other temperature-sensitive, mechanically movable elements. It is also advantageous that, in the event of a subsequent drop in temperature, the strip 8 retains its shape and does not rise again from the mating contact 9. The alarm signal emitted by the detector is therefore self-holding. The detector can only be reset by deforming the strip 8 again in the cooled state. This reset can be done mechanically by hand when using a shape memory alloy that works according to the one-way shape memory effect.
  • an alloy which works according to the two-way shape memory effect which therefore partially deforms again when the temperature drops below a lower lower threshold, so that the strip 8 lifts again from the contact 9.
  • This lower lower threshold can be selected so that it is above room temperature, so that such a detector automatically resets when the air temperature drops.
  • the alloy can also be chosen so that the lower temperature threshold is below room temperature.
  • Such a detector does not automatically reset itself, but it can be reset by means of heat-extracting means, for example by cooling with a suitable spray which is sprayed into the interior of the housing.
  • FIG. 2 shows a further example of a thermal fire detector with a base plate 11 and a housing 12 placed thereon and having air inlet openings, in which in turn a mounting plate 13 is provided.
  • a strip, wire or pin 15 of a suitable shape is on a fastening part 14 memory alloy attached.
  • Whose free end is connected via a coil spring 16 to an opposite Befes- g tigun sw 17 is connected so that the system element 15 and coil spring 16 has only two stable positions, ie, a snap effect shows.
  • the element 15 is in turn deformed so that it is stretched in the initial state, i.e. in the upper stable position. During cold forming, it is now deformed so far that it assumes the other, lower, stable position. When the temperature rises and the critical temperature is reached, the element suddenly snaps back, a pin 8 attached to the element 15 pressing on a pressure-sensitive switching element 19.
  • This pressure-sensitive element 19 can be, for example, a microswitch, a pressure-sensitive elastomer or an optical fiber, the transmission properties of which change when pressure is applied.
  • An alarm signal can in turn be triggered via the two electrical connections of the pressure-sensitive switching element 19.
  • a particular advantage of this version is the avoidance of open contacts and thus the safer contact with an additional increased switching force.
  • the temperature-sensitive element made of a shape memory alloy is designed as a coil spring 24, one end 25 of which is fastened to the underside of the housing, while the other End 26 is fixedly connected to a movable plunger 27 which extends through a central opening of the mounting plate 23 and the underside of the housing.
  • a spring with 5th turns was made 1 mm thick Ni55 / Ti45 wire with 16 mm diameter is used.
  • a magnetically actuatable switching element 28 is attached to the base plate 23 in the vicinity of the movable plunger 27.
  • a permanent magnet 29 is attached to the upper side of the movable plunger 27 and can be designed, for example, as an AlNiCo magnet or as a SmCo magnet.
  • annular marking 30 made of a signal color, for example red.
  • the temperature-sensitive coil spring 24 is now designed such that it presses the punch 27 upward after the cold deformation.
  • the permanent magnet 29 is selected and attached in relation to the magnetically actuable switch 28 such that the magnetic field in this position of the plunger 27 is not sufficient to close the contact 28. If the air temperature and thus the temperature of the coil spring 24 now reaches the critical temperature, the coil spring 24 again assumes the original shape before the cold deformation, ie it contracts and pulls the punch 27 downward. As a result, the switch 28 comes under the influence of the permanent magnet 29 and its contacts close, so that an alarm signal is triggered via the lines connected to the connections of the switch 28.
  • a magnetic snap effect can be achieved by soft iron parts attached in parallel.
  • the stamp 27 can be pushed back into the housing by hand, where the coil spring 24 is again cold formed. The B edge detector is now ready for use again.
  • it has the advantages that, despite the simplest design, it displays a self-holding alarm signal both on the fire detector itself and via cables at a remote location, with no current flowing when not addressed.
  • Such detectors can therefore be connected in large numbers in parallel, also combined with hand alarm buttons or other fire detectors, which also do not cause quiescent current.
  • the alarm signal is given by closing contacts as a result of the movement of the element consisting of a shape memory alloy in a direct or indirect manner.
  • fire phenomena other than air temperature such as the occurrence of smoke or fire aerosol
  • FIG. 4 shows an optical smoke detector of this type.
  • a housing 32 which has air inlet openings 33 and in which a cup-shaped support part 34 is located, is in turn attached to a base plate 31.
  • a radiation source 35 which, by means of an associated optical system, generates a cone-shaped radiation region 36, as described, for example, in Swiss Patent No. 592 932.
  • a shielding part 37 which shields the interior of the housing against direct light, but allows air to enter in a tortuous way.
  • a photoelectric radiation receiver 38 which is normally outside the conical radiation area 6.
  • a temperature-sensitive element 39 made of a suitable shape-memory alloy is provided on the cup-shaped support part 34 inside the housing. This temperature-sensitive element 39 is designed and attached with respect to the radiation region 36 in such a way that in the cold-formed state it lies completely outside of this region, that is to say from the direct radiation of the radiation source 35 is not hit.
  • the element 39 takes on the originally impressed shape again and moves with its free end into the radiation region 36.
  • the direct radiation from the radiation source 35 thus striking the free end of the element 39 is reflected and scattered, and part of this radiation strikes the radiation receiver 38. This is influenced in a manner similar to that caused by the scattered radiation emitted by smoke particles in the radiation region 36 . If the selected critical temperature is exceeded, the change in shape of the temperature-sensitive element triggers an alarm signal in the same way as if smoke particles producing scattered radiation were present in the radiation area.
  • the concept of the invention can also be used in a radiation extinction detector in which the radiation attenuation by smoke in a measuring section is used for alarm signaling.
  • the element is formed from a shape memory alloy in such a way that it swivels into the measuring section when the critical temperature is reached and likewise causes radiation to be weakened.
  • FIGS. 5a and 5b show an ionization smoke detector with a base plate 41, on the underside of which an ionization measuring chamber 42 is attached, and the top of which carries a reference ionization chamber 43.
  • a center electrode 44 and 45 for the ionization measuring chamber 42 and the reference chamber 43 is attached on both sides.
  • the center electrodes 44 and 45 each carry a radioactive preparation 46 and 47, through which the air in the two chambers is ionized.
  • the grid-shaped housing 48 of the ionization measuring chamber 42 and the air-impermeable housing 49 of the reference chamber 43 serve as counter electrodes of the two chambers 42 and 43.
  • Corresponding designs and evaluation circuits of such ionization smoke detectors are known, for example, from Swiss Patents No. 486 082 and 489 070.
  • the functors of such ionization smoke detectors are based on the fact that smoke particles or fire aerosol, which has penetrated into the ionization measuring chamber 42, reduce the ion current flowing between the center electrode 44 and the housing wall 48 serving as counter electrode. This current reduction is over. an associated evaluation circuit used in a known manner to trigger an alarm signal.
  • the ionization smoke detector shown in FIGS. 5a and 5b contains a temperature-sensitive element 40 made of a shape memory alloy, one end of which is attached to the base plate 41.
  • the temperature-sensitive element 40 is attached in such a way that it does not, or only slightly, influences the radioactive radiation emanating from the radiation source 46 in the cold-deformed state. However, if the critical temperature of the shape memory alloy used is exceeded, the free end of the temperature-sensitive element moves into the originally embossed position. A flag 50 attached to this free end is moved over the radioactive source 46 and largely shields its radioactive radiation.
  • a modification which differs only slightly from this embodiment uses the temperature-sensitive element 40 as a carrier of a portable electrode in order to influence the electric field directly, independent of the radiation source 46, in such a way that the desired current change occurs.
  • a fire alarm signal can therefore be triggered in a simple and safe manner without the use of an additional evaluation circuit if different types of fire phenomena occur.
  • FIG. 6 shows an autonomous fire detector with its own power supply, which does not have to be connected to a signaling center via lines.
  • Such fire detectors are used, for example, as home detectors to protect a single object.
  • the fire detector shown works according to the well-known principle of the electric bell with a Wagner hammer.
  • a rigid account carrier 52 and an elastic, vibratable contact carrier 53 are fastened on one side clamped on a carrier plate 51.
  • the free ends each have a contact 54 and 55.
  • the fixed ends of the two contact carriers 52 and 53 are connected to one another via a battery 56 and an electromagnet coil 57.
  • the elastic contact carrier 53 is arranged so that it is attracted to the electromagnet 57 as soon as a current through it Coil flows.
  • a clapper 58 provided at the free end of the elastic contact carrier 53 strikes a bell 59.
  • the rigid contact carrier 52 is produced from a suitable shape memory alloy and is attached and cold-worked in such a way that the two contacts 54 and 55 do not touch at room temperature.
  • the rigid contact carrier 52 deforms until the two contacts 54 and 55 touch and a current flows through the electromagnetic coil 57.
  • the elastic contact carrier 53 is attracted by the electromagnet 57, the clapper 58 strikes against the bell 59 and the contacts 54 and 55 open again, whereby the current is interrupted, the elastic contact carrier 53 springs back until the contacts 54 and 55 touch again.
  • the process described is then repeated periodically.
  • the bell can only be switched off by reshaping the rigid contact carrier 52 in the cold state.
  • the degree of shape change is in no way critical, i.e. the fire detector works reliably over long periods without the need for precise readjustment.
  • the invention is not limited to the described embodiments of using a temperature-sensitive element made of a shape memory alloy in a fire detector with a further fire sensor element.
  • the idea of the invention can also be realized in connection with other fire protection devices in which a signal can be triggered indirectly when an element made from a shape memory alloy is deformed.
  • the example is the possible Mention mentioned indirectly trigger an alarm signal by the temperature-sensitive element first actuates a fire control system when the critical temperature is exceeded, for example, opens an emergency exit door or smoke flaps, or closes a fire door, which then closes or opens contacts for alarm signaling.
  • a temperature-sensitive element made of a shape memory alloy in a fire detector therefore has the advantage that safe, self-locking alarm signaling can be achieved with a minimal effort when a critical temperature is reached, without the need for components with narrow tolerances and precise adjustment.
  • a fire detector designed in this way thus has increased functional reliability over longer operating times and reduced susceptibility to faults.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Thermally Actuated Switches (AREA)
EP80200327A 1979-05-21 1980-04-14 Avertisseur d'incendie comportant un élément sensible à la température Withdrawn EP0019310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH471979A CH638101A5 (de) 1979-05-21 1979-05-21 Brandmelder.
CH4719/79 1979-05-21

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP80200962.1 Division-Into 1980-04-14
EP80200962A Division EP0024370A3 (fr) 1979-05-21 1980-04-14 Dispositif d'alarme d'incendie sensible à la fumée et à la température

Publications (1)

Publication Number Publication Date
EP0019310A1 true EP0019310A1 (fr) 1980-11-26

Family

ID=4281317

Family Applications (2)

Application Number Title Priority Date Filing Date
EP80200962A Withdrawn EP0024370A3 (fr) 1979-05-21 1980-04-14 Dispositif d'alarme d'incendie sensible à la fumée et à la température
EP80200327A Withdrawn EP0019310A1 (fr) 1979-05-21 1980-04-14 Avertisseur d'incendie comportant un élément sensible à la température

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP80200962A Withdrawn EP0024370A3 (fr) 1979-05-21 1980-04-14 Dispositif d'alarme d'incendie sensible à la fumée et à la température

Country Status (6)

Country Link
US (1) US4356478A (fr)
EP (2) EP0024370A3 (fr)
JP (1) JPS55154692A (fr)
AU (1) AU5781380A (fr)
CA (1) CA1173130A (fr)
CH (1) CH638101A5 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516282A1 (fr) * 1981-11-11 1983-05-13 Cerberus Ag Detecteur de fumees a source de rayonnement operee de facon impulsionnelle
GB2139435A (en) * 1983-05-02 1984-11-07 Int Standard Electric Corp Surge protector
GB2174548A (en) * 1985-04-11 1986-11-05 Nittan Co Ltd Combination heat-sensing fire detector
FR2650670A1 (fr) * 1989-08-02 1991-02-08 Fiori Costantino Systeme de detection d'incendie ou de tout autre phenomene engendrant une elevation ou une baisse anormale de temperature par rapport a une reference fixee

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US4452537A (en) * 1981-11-30 1984-06-05 Rhythm Watch Co., Ltd. Alarm setting apparatus for timepieces
JPS58122189U (ja) * 1982-02-09 1983-08-19 株式会社トーキン 火災報知用温度感知器
JPS58122188U (ja) * 1982-02-09 1983-08-19 株式会社トーキン 火災報知用温度感知器
GB8312831D0 (en) * 1983-05-10 1983-06-15 Leuven Res & Dev Vzw Temperature monitoring device
DE3400409A1 (de) * 1984-01-07 1985-07-18 Vdo Adolf Schindling Ag, 6000 Frankfurt Temperaturschalter
US4800371A (en) * 1985-02-12 1989-01-24 Arsi Joseph N Freeze alarm
EP0338218B1 (fr) * 1988-03-30 1993-09-15 Cerberus Ag Méthode de détection précoce d'incendie
US4823861A (en) * 1988-09-06 1989-04-25 The Babcock & Wilcox Company Fire detection device for regenerative air heater
US5059850A (en) * 1989-02-14 1991-10-22 Brother Kogyo Kabushiki Kaisha Temperature compensation member composed of shape memory effect alloy for an actuator driven by a piezo-electric element
US5134248A (en) * 1990-08-15 1992-07-28 Advanced Temperature Devices, Inc. Thin film flexible electrical connector
US6069551A (en) * 1997-05-02 2000-05-30 Therm-O-Disc, Incorporated Thermal switch assembly
CA2233390A1 (fr) * 1997-05-02 1998-11-02 William F. Quinn Ensemble thermocontact
US5844464A (en) * 1997-11-24 1998-12-01 Therm-O-Disc, Incorporated Thermal switch
US6018286A (en) * 1998-11-20 2000-01-25 Therm-O-Disc, Incorporated Thermal switch
US6239686B1 (en) 1999-08-06 2001-05-29 Therm-O-Disc, Incorporated Temperature responsive switch with shape memory actuator
US6342826B1 (en) 1999-08-11 2002-01-29 Therm-O-Disc, Incorporated Pressure and temperature responsive switch assembly
DE10030394C1 (de) * 2000-06-21 2001-10-25 Siemens Ag Schaltereinrichtung mit einem Aktuatorelement aus einer Form-Gedächtnis-Legierung
US20040201444A1 (en) * 2000-12-20 2004-10-14 Byong-Ho Park Shape memory alloy actuators activated by strain gradient variation during phase transformation
US6741158B2 (en) * 2002-07-18 2004-05-25 Honeywell International Inc. Magnetically sensed thermostat control
US20060273876A1 (en) * 2005-06-02 2006-12-07 Pachla Timothy E Over-temperature protection devices, applications and circuits
US8319596B2 (en) * 2009-05-20 2012-11-27 GM Global Technology Operations LLC Active material circuit protector
US8754740B2 (en) * 2009-05-20 2014-06-17 GM Global Technology Operations LLC Circuit implement utilizing active material actuation
US8830026B2 (en) * 2010-12-30 2014-09-09 General Electric Company Shape memory alloy actuated circuit breaker
CN104766432B (zh) * 2015-03-19 2017-08-25 保定隶都电子科技有限公司 感烟感温火灾探测器
US10388480B2 (en) * 2016-08-18 2019-08-20 Eaton Intelligent Power Limited Dual element fuse and methods of manufacture
US10232202B1 (en) * 2016-09-07 2019-03-19 WilliamsRDM, Inc Self contained stovetop fire suppressor with alert signal and method
WO2018140457A1 (fr) 2017-01-24 2018-08-02 Hyslop William J Tête d'extincteur à ressort en amf
CN107084414A (zh) * 2017-04-07 2017-08-22 中国航天建设集团有限公司 具有主动感温开关的吸油烟机

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US3184727A (en) * 1962-09-10 1965-05-18 Miessner Inventions Inc Alarm system
US3516082A (en) * 1967-06-09 1970-06-02 Roy G Cooper Temperature sensing devices
FR2409559A1 (fr) * 1977-11-21 1979-06-15 Cerberus Ag Detecteur de fumee

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US2989738A (en) * 1956-07-11 1961-06-20 Pioneer Electric Brandon Ltd Transformer overload indicating system
US2886804A (en) * 1957-05-27 1959-05-12 Roy P Behrendt Alarm device
US4027165A (en) * 1976-02-17 1977-05-31 The United States Of America As Represented By The United States Energy Research And Development Administration Ionization detection system for aerosols
CH616270A5 (fr) * 1977-05-06 1980-03-14 Bbc Brown Boveri & Cie

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US3184727A (en) * 1962-09-10 1965-05-18 Miessner Inventions Inc Alarm system
US3516082A (en) * 1967-06-09 1970-06-02 Roy G Cooper Temperature sensing devices
FR2409559A1 (fr) * 1977-11-21 1979-06-15 Cerberus Ag Detecteur de fumee

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516282A1 (fr) * 1981-11-11 1983-05-13 Cerberus Ag Detecteur de fumees a source de rayonnement operee de facon impulsionnelle
GB2139435A (en) * 1983-05-02 1984-11-07 Int Standard Electric Corp Surge protector
GB2174548A (en) * 1985-04-11 1986-11-05 Nittan Co Ltd Combination heat-sensing fire detector
GB2174548B (en) * 1985-04-11 1989-06-21 Nittan Co Ltd Combination heat-sensing fire detector
FR2650670A1 (fr) * 1989-08-02 1991-02-08 Fiori Costantino Systeme de detection d'incendie ou de tout autre phenomene engendrant une elevation ou une baisse anormale de temperature par rapport a une reference fixee

Also Published As

Publication number Publication date
AU5781380A (en) 1980-11-27
EP0024370A3 (fr) 1981-03-18
US4356478A (en) 1982-10-26
CA1173130A (fr) 1984-08-21
JPS55154692A (en) 1980-12-02
CH638101A5 (de) 1983-09-15
EP0024370A2 (fr) 1981-03-04

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