EP0065826A1 - Mechanically actuated signalling apparatus - Google Patents

Mechanically actuated signalling apparatus Download PDF

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Publication number
EP0065826A1
EP0065826A1 EP82302152A EP82302152A EP0065826A1 EP 0065826 A1 EP0065826 A1 EP 0065826A1 EP 82302152 A EP82302152 A EP 82302152A EP 82302152 A EP82302152 A EP 82302152A EP 0065826 A1 EP0065826 A1 EP 0065826A1
Authority
EP
European Patent Office
Prior art keywords
breakable
switch
breakable member
breakage
operating position
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Withdrawn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
EP82302152A
Other languages
German (de)
English (en)
French (fr)
Inventor
Michael Anderson
Peter John Mitchell
Antony John Watkins
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.)
TANN-SYNCHRONOME Ltd
Original Assignee
TANN-SYNCHRONOME 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
Application filed by TANN-SYNCHRONOME Ltd filed Critical TANN-SYNCHRONOME Ltd
Publication of EP0065826A1 publication Critical patent/EP0065826A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/022—Emergency operating parts, e.g. for stop-switch in dangerous conditions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/12—Manually actuated calamity alarm transmitting arrangements emergency non-personal manually actuated alarm, activators, e.g. details of alarm push buttons mounted on an infrastructure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/022—Emergency operating parts, e.g. for stop-switch in dangerous conditions
    • H01H2003/0233—Emergency operating parts, e.g. for stop-switch in dangerous conditions for alarm triggering, e.g. fire alarm, emergency off switches operated by breaking a glass

Definitions

  • This invention relates to mechanically actuated signalling apparatus, and may find particular application in signalling apparatus for electrical fire alarms.
  • the types of alarm actuation apparatus in which a glass plate is broken to produce a signal to operate a fire alarm are well known. Some of these types of apparatus are adapted to be operated by the impact from, for example, a small hammer which is provided in association with the apparatus, while others are adapted to operate under a steadily applied force, such as that which could be applied by hand alone. It has been customary in the past to use a small plate of glass as the breakable element is these types of apparatus but the pieces of broken glass that are left after operation can be a hazard. It is therefore desirable to use an alternative material such as a thermoplastics material which does not leave jagged pieces when broken and has a better response to a steady force applied directly by hand. Once broken, the mechanical constraint imparted by the plate on an operating member inside the apparatus, normally a moving portion of a switch, is removed.
  • a signalling apparatus comprising a biased switch member (8) held from its signal-operating position by a breakable member (11) which upon breakage allows the switch to move to its signal operating position;
  • the fulcrum element (6) is in the general form of a knife edge disposed in opposition to a casing element (21) spaced from, and extending at least substantially parallel to said edge to define an opening therebetween to accommodate the broken portion (12), whereby on breakage of the member (11) the pivot axis about which the force acts lies along a line between said knife edge and said casing element (21).
  • the breakable member (11) may include one or more weakened areas (17) along which fracture occurs when it is broken, the switch member and the fulcrum element being on the same side of each weakened area (17).
  • the breakable member (11) may be a laminar piece of material mounted in a housing (20) such that a large part of one of its major surfaces forms a facing surface of an alarm actuation device, the marginal regions of the piece of material being located within the housing and said switch member being arranged to act on an enclosed marginal region of a major surface of the piece of material.
  • the fulcrum element defines one side of a narrow opening through which the breakable member (11) extends, a marginal area of the breakable member and the switch member (8) being beyond this opening and enclosed by the housing so that manual access to the switch member (8) after the breakage is prevented by the narrow width of the opening.
  • a unit for actuating a fire alarm comprises a main box housing 1 and includes within it a smaller box housing 2 both housings having a common, opens, frontward-facing side.
  • the inner housing 2 includes a horizontal wall 3 at its lower end, the edge surface of which, facing outwardly from the main housing 1 has a shallow receiving- recess 4.
  • the upper part of the inner housing 2 comprises a horizontal ledge 5 the forward edge 6 of which is tapered to a blunt knife-edge.
  • Below its lower corner towards the centre of the main housing 1 the inner housing 2 has a projecting boss 7 with a screw threaded bore for locating a cover plate, as will be described.
  • a micro-switch 8 with an actuating button 9 facing outwardly from housing 1.
  • the surface of the micro-switch 8 is set just behind the outward facing edges of the housing 2, but the actuating button 9 extends outwardly beyond these edges.
  • the main housing 1 includes, on the exterior of its upper wall, two moulded hinge- receiving recesses 10.
  • the breakable element of the apparatus is a moulded plate of clear plastics material 11 which is generally rectangular in outline.
  • This breakable plate is shaped to fit over the area defined by the inner housing 2.
  • the plate 11 is shorter in the horizontal direction, and on its two shorter edges are respective small tabs 12 and 13 integrally moulded with the main portion of the plate.
  • the upper tab 12 is adapted to be disposed over the actuating button 9 of the micro- switch when the breakable plate 11 is located, so that the rear surface 14 of the tab 12 depresses the button 9.
  • the lower tab 13 is located in the recess 4 in forward edge of the ledge 3 of the inner housing 2 so that the lower horizontal edge of the breakable plate 11 rests on the ledge 3.
  • the lower end of the rearward facing surface of the tab 13 is provided with a horizontal lip 15 which is adapted to be positioned just beneath the ledge 3 and so prevent the breakable plate 11 from rotating outwardly from its vertical, located position.
  • the breakable plate 11 has, along its longer, vertical edges, an integral thickened region 16 which extends the full height of the plate and serves to strengthen the main body of the breakable plate against forces applied perpendicular to its face.
  • the breakable plate 11 is weakened by the inclusion of two V-shaped grooves 17 in its rear surface extending along the junction line between each of the tabs 12 and 13 and the main area of the plate. These grooves become preferential breaking lines when a perpendicular force is applied to the main face of the plate.
  • a front. cover 18 is provided for the apparatus and this covers the forward facing opening of the housing 1 but has a rectangular aperture 19 corresponding to the position of the breakable plate 11 when located over the inner housing 2.
  • a rim 20 Surrounding the rectangular aperture 19 on the front cover 18 and projecting from the rearwardly facing surface of the front plate is a rim 20 whose rearwardly facing edge 21 bears directly on the frontward surface of the breakable plate 11 to define a central, exposed area of the plate and a marginal region around the perimeter of the plate which is obscured within the housing.
  • Figure 2 illustrates the manner in which the edge surface 21 of the front cover engages the edge region of the breakable plate 1 and forces it against the blunt knife edge 6 of the ledge 5 of the inner housing and also against the actuating button 9 of the micro-switch 8.
  • edge surface 21 of the rim 20 forces the plate 11 against the lower ledge 3 of the inner housing 2.
  • the front cover plate 18 is fixed to the housing by hinges 30 locating in the recesses 10 on the main housing and by a socket-headed screw 22 on the lower margin of the front plate which fits in the threaded bore through the boss 7 on the inner housing 2. As the fixing screw 22 is tightened it draws in the front cover 18 causing the upper element tab 12 to depress the actuating button 9 of the microswitch.
  • the microswitch 8 is of sub-minature size and is connected to an electrical circuit which extends to control equipment of a fire alarm system.
  • the actuation button 9 When the actuation button 9 is released switch contacts of the microswitch 8 change state and a signal is transmitted to the control equipment, thereby indicating an alarm condition.
  • Figure 2 illustrates the position of the components in the normal state when the apparatus is not operated and no alarm signal is transmitted.
  • Figure 4 illustrates the breakage mode in which the lower tab 13 is broken off from the main portion of the plate 11.
  • the lower broken edge of the main portion of the plate 11 is free to move inwardly into the cavity contained within the housing 2 but not outwardly because of the obstruction by the rim 20 of the cover plate.
  • the bias force of the microswitch actuation button 9 can again prevail, in this circumstance by pivotting the tab 12 about the fulcrum 6, whereupon the main part of the plate 11 moves inwardly and again the microswitch is operated without being impeded by the broken plate.
  • the microswitch actuation button 9 will still operate and the electrical signal indicating an alarm condition will be sent to the control box. It will also be appreciated that the small gap between the surface 21 of the upper rim 20 of the cover plate and the fulcrum edge 6 makes it-extremely difficult for the switch to be reset from the front opening of the apparatus. To reset the microswitch the unit must be opened and fitted with a new breakable element.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
EP82302152A 1981-04-28 1982-04-27 Mechanically actuated signalling apparatus Withdrawn EP0065826A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8113059 1981-04-28
GB8113059 1981-04-28

Publications (1)

Publication Number Publication Date
EP0065826A1 true EP0065826A1 (en) 1982-12-01

Family

ID=10521422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302152A Withdrawn EP0065826A1 (en) 1981-04-28 1982-04-27 Mechanically actuated signalling apparatus

Country Status (3)

Country Link
EP (1) EP0065826A1 (da)
DK (1) DK188082A (da)
GR (1) GR75412B (da)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2531566A1 (fr) * 1982-08-03 1984-02-10 Kac Alarm Co Ltd Commutateur electrique
EP0270286A2 (en) * 1986-11-20 1988-06-08 Signature Industries Limited Alarm switch
EP0367997A2 (de) * 1988-10-07 1990-05-16 Gerald Dipl.-Ing. Harms Notschalter
EP0488600A1 (en) * 1990-11-24 1992-06-03 Kac Alarm Company Limited Terminal box and call point
EP0509466A1 (fr) * 1991-04-19 1992-10-21 SMH Management Services AG Dispositif d'interruption irréversible du fonctionnement d'un appareil commandé par un système électronique
GB2283271A (en) * 1993-10-08 1995-05-03 Pickersgill Kaye Ltd Emergency cover plate
EP0692601A1 (en) * 1994-07-15 1996-01-17 RACK SYSTEM S.r.l. Improved wing particularly designed for application to boxes and casings for fire extinguishers, fire plugs and antifire and antiaccident items
GB2313614A (en) * 1996-05-31 1997-12-03 Medaes Ltd Breakable cover for an emergency control device
EP1288881A1 (de) * 2001-09-03 2003-03-05 Siemens Building Technologies AG Handgefahrenmelder
GB2439408A (en) * 2006-04-10 2007-12-27 Bosch Gmbh Robert Alarm call point having a break pane comprising two separate regions linked by a frangible region
GB2435546B (en) * 2006-02-28 2009-07-22 Maxhunt Ltd Call points
CN106548608A (zh) * 2015-09-18 2017-03-29 海湾安全技术有限公司 手拉报警装置推板
US9884014B2 (en) 2004-10-12 2018-02-06 Adare Pharmaceuticals, Inc. Taste-masked pharmaceutical compositions
EP3624078A1 (de) * 2018-09-17 2020-03-18 MEP - Gefahrenmeldetechnik Gesellschaft mit Beschränkter Haftung Vorrichtung zur zerstörung eines zerbrechlichen, scheibenförmigen schutzelements mittels eines zerstörelements

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE544483C (de) * 1932-02-18 Blessing E Fenster fuer Strassenmelder
GB1103457A (en) * 1965-06-24 1968-02-14 Minerva Detector Company Ltd Improvements in and relating to signal devices
GB1311696A (en) * 1970-10-02 1973-03-28 Reid R J Signalling devices
GB1574703A (en) * 1977-03-01 1980-09-10 Emi Ltd Alarm call point

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE544483C (de) * 1932-02-18 Blessing E Fenster fuer Strassenmelder
GB1103457A (en) * 1965-06-24 1968-02-14 Minerva Detector Company Ltd Improvements in and relating to signal devices
GB1311696A (en) * 1970-10-02 1973-03-28 Reid R J Signalling devices
GB1574703A (en) * 1977-03-01 1980-09-10 Emi Ltd Alarm call point

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2531566A1 (fr) * 1982-08-03 1984-02-10 Kac Alarm Co Ltd Commutateur electrique
EP0270286A2 (en) * 1986-11-20 1988-06-08 Signature Industries Limited Alarm switch
EP0270286A3 (en) * 1986-11-20 1990-01-17 Clifford & Snell Limited Alarm switch
EP0367997A2 (de) * 1988-10-07 1990-05-16 Gerald Dipl.-Ing. Harms Notschalter
DE3834105A1 (de) * 1988-10-07 1990-05-17 Gfs Ges Fuer Sicherheitstechni Notschalter
EP0367997A3 (de) * 1988-10-07 1991-03-06 Gerald Dipl.-Ing. Harms Notschalter
EP0488600A1 (en) * 1990-11-24 1992-06-03 Kac Alarm Company Limited Terminal box and call point
EP0509466A1 (fr) * 1991-04-19 1992-10-21 SMH Management Services AG Dispositif d'interruption irréversible du fonctionnement d'un appareil commandé par un système électronique
FR2675653A1 (fr) * 1991-04-19 1992-10-23 Smh Management Services Ag Dispositif d'interruption irreversible du fonctionnement d'un appareil commande par un circuit imprime.
US5272292A (en) * 1991-04-19 1993-12-21 Smh Management Services Ag Irreversible arrangement for interrupting the functioning of an apparatus controlled by an electronic system
GB2283271B (en) * 1993-10-08 1997-02-12 Pickersgill Kaye Ltd Emergency cover plate
GB2283271A (en) * 1993-10-08 1995-05-03 Pickersgill Kaye Ltd Emergency cover plate
EP0692601A1 (en) * 1994-07-15 1996-01-17 RACK SYSTEM S.r.l. Improved wing particularly designed for application to boxes and casings for fire extinguishers, fire plugs and antifire and antiaccident items
GB2313614A (en) * 1996-05-31 1997-12-03 Medaes Ltd Breakable cover for an emergency control device
KR100843797B1 (ko) * 2001-09-03 2008-07-04 지멘스 빌딩 테크놀로지스 악티엔게젤샤프트 수동 경보기
US6674032B2 (en) 2001-09-03 2004-01-06 Siemens Building Technologies Ag Manual call point
EP1288881A1 (de) * 2001-09-03 2003-03-05 Siemens Building Technologies AG Handgefahrenmelder
US9884014B2 (en) 2004-10-12 2018-02-06 Adare Pharmaceuticals, Inc. Taste-masked pharmaceutical compositions
GB2435546B (en) * 2006-02-28 2009-07-22 Maxhunt Ltd Call points
GB2439408A (en) * 2006-04-10 2007-12-27 Bosch Gmbh Robert Alarm call point having a break pane comprising two separate regions linked by a frangible region
GB2439408B (en) * 2006-04-10 2009-03-25 Bosch Gmbh Robert Break pane of plastics material for an alarm call point device, alarm call point device with break pane and method for producing the break pane
DE102006016803B4 (de) * 2006-04-10 2020-12-24 Robert Bosch Gmbh Einschlagscheibe aus Kunststoff für eine Alarmmeldevorrichtung, Alarmmeldevorrichtung mit Einschlagscheibe sowie Verfahren zur Herstellung der Einschlagscheibe
CN106548608A (zh) * 2015-09-18 2017-03-29 海湾安全技术有限公司 手拉报警装置推板
EP3159863A1 (en) * 2015-09-18 2017-04-26 Gulf Security Technology Company Limited Push plate of manual alarm device
US10249175B2 (en) 2015-09-18 2019-04-02 Gulf Security Technology Company Limited Push plate of manual alarm device
EP3624078A1 (de) * 2018-09-17 2020-03-18 MEP - Gefahrenmeldetechnik Gesellschaft mit Beschränkter Haftung Vorrichtung zur zerstörung eines zerbrechlichen, scheibenförmigen schutzelements mittels eines zerstörelements

Also Published As

Publication number Publication date
GR75412B (da) 1984-07-16
DK188082A (da) 1982-10-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19830606

D17P Request for examination filed (deleted)
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Effective date: 19830601

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19841031

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ANDERSON, MICHAEL

Inventor name: MITCHELL, PETER JOHN

Inventor name: WATKINS, ANTONY JOHN