GB2421620A - Fire alarm sounder - Google Patents
Fire alarm sounder Download PDFInfo
- Publication number
- GB2421620A GB2421620A GB0428143A GB0428143A GB2421620A GB 2421620 A GB2421620 A GB 2421620A GB 0428143 A GB0428143 A GB 0428143A GB 0428143 A GB0428143 A GB 0428143A GB 2421620 A GB2421620 A GB 2421620A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detector
- acoustic
- previous
- forms
- fire alarm
- 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- Withdrawn
Links
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000779 smoke Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims 4
- 238000000465 moulding Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 230000011664 signaling Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- General Physics & Mathematics (AREA)
- Fire Alarms (AREA)
Abstract
A fire alarm has an acoustic cavity 7 located immediately behind the surface which is most remote from the mounting surface 2. The former surface is provided with apertures 8 which allow the sound from sounder 6 to be emitted. The sounder 6 is preferably a piezo disc.
Description
Detector sounder This invention relates to a method of combining detectors
used for detecting fires and a sound signalling device for signalling a fire condition.
it is common practice for fire alarm systems to use detection devices on detection circuits and sounding devices on sounder circuits This has been a standard practice for many years but results in two cabled circuits being installed which is more expensive that a single cable.
In an attempt to reduce system costs, addressable and analogue addressable system types have been developed which now enable low power sounding devices to be connected on the same electrical circuit to reduce costs.
As a result of these developments, sounding devices have been developed to fit between the detection device and the mounting surface to further simplify the installation and reduce costs.
A further development of this approach has been to integrate a sound4g device to a detection device so that the product is installed as one product instead of two or1more.
One of the problems with each of the current methods described above is that the sounding devices used are usually transducer modules. These could be piezo based or electromagnetic type devices. Both types of transducer module can be quite large when designed to produce the sounds required for fire alarm signalling applications and achieve the sound pressure levels required to signal an alarm.
The problem with current solutions for integrating a sounding device is that the main area available is reserved for the detection chamber and can not easily be changed with out affecting the detection characteristics of the detector. This leaves a small space behind the chamber which is normally used for housing the electronic assembly. Presently, some products use some of this space available but it is limited and only provides space for small sounding devices which have limited frequency and sound pressure level capabilities and are therefore limited in their performance. Alternatively, a larger device can be fitted but at the expense of significant aesthetic impact and sometimes poor acoustic performance as the devices are fitted into very small spaces leaving little or no space for a reasonable acoustic enclosure design.
The present invention provides means of integrating a sounding device into a detection device with minimal space requirements. This minimises any effects on the detection characteristics and eliminates the problems encountered when fitting transducer modules in to detection devices due to the limited space available. These problems include compromising acoustic performance due to using very small transducers and having restricted acoustic properties that reduce the performance of larger transducers.
Accordingly, this invention provides apparatus for integrating a sounding device into a detection device in such a way that minimal space is required whilst providing adequate acoustic performance. The apparatus comprises a housing having a base for mounting the apparatus in use to a surthce, the housing contains a detector unit, a suitable acoustic device and means for fixing the acoustic device into the housing where the acoustic device is located substantially displaced axially of the base.
Preferably the acoustic device may be located substantially axially displaced from the base and beyond a slot or slots provided in the housing.
Also, preferably the acoustic device may be fitted into the detector housing such that the housing provides some or all of the acoustic enclosure for the acoustic device to perform adequately.
A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which: Fig I shows a simplified cross section of a typical smoke detector; Fig 2. shows a cross section view of how this invention could be integrated into a detector; As shown in fig I., all detectors have a surface that is the furthest most surface (1) from the mounting surface (2). This surface is normally centrally positioned and is of a diameter or size that is sufficient to house a detection chamber for smoke. Electronic components could be placed either side of the printed circuit board (3) and some form of electncal termination would be provided to connect from the printed circuit board to terminals in the base (4) of the detector. The base (4) of the detector needs to provide adequate space for the termination of cables used to connect the device to a detection circuit so this space is restricted for housing a transducer module for sound generation.
A transducer module suitable for generating an appropriate acoustic performance would be too large to place inside the housing of the detector shown in figi with out having a significant impact on the size and shape of the detector.
Now with reference to fig 2, the space required for a transducer module has been eliminated by integrating an acoustic housing in the detector behind the surface that is the furthest most surface from the mounting surface To achieve this, the invention provides a ledge (5) on which to fix a piezo disc (6) or other suitable acoustic device with an acoustic cavity (7) all built into the part that provides the furthest most surface from the detector body. This surface is then perforated with holes (8) to enable the sound to be emitted. The acoustic cavity (7) and the perforations (8) and the piezo disc (6) are all designed to provide a suitable acoustic performance.
The detector part that forms the furthest most surface from the mounting surface now also provides the acoustic enclosure and properties that would normally be provided by separate parts that create an acoustic module. This reduces the height substantially and with the size, particularly the height of the acoustic assembly much reduced, it becomes viable to position the acoustic assembly behind surface I of the detection device
Claims (5)
- I. Apparatus providing means for integrating a transducer greater than 30mm in diameter with an acoustic cavity in the top part of a moulding of a detector used for detecting fires, where an acoustic cavity is formed by the same part that forms the surface of the detector furthest away from the mounting surface.
- 2. A claim as in claim 1 where the fire detector uses optical technology, heat sensing technology, chemical sensing technology or any combination of these technologies for the purpose of detecting a fire or smoke particles.
- 3. A claim as in any of the previous claims where the apertures for sound emission are on the surface of the detector furthest away from the mounting surface.
- 4. A claim as in any of the previous claims where the apertures for sound emission are at the rear of the acoustic device facing towards the detection chamber.
- 5. A claim as in any of the previous claims where the part that forms the furthest most surface from the detector is a separate piece to that which forms the main body of the detector.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0428143A GB2421620A (en) | 2004-12-23 | 2004-12-23 | Fire alarm sounder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0428143A GB2421620A (en) | 2004-12-23 | 2004-12-23 | Fire alarm sounder |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0428143D0 GB0428143D0 (en) | 2005-01-26 |
GB2421620A true GB2421620A (en) | 2006-06-28 |
Family
ID=34113097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0428143A Withdrawn GB2421620A (en) | 2004-12-23 | 2004-12-23 | Fire alarm sounder |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2421620A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008065831A1 (en) | 2006-11-29 | 2008-06-05 | Panasonic Electric Works Co., Ltd. | Fire detector |
GB2449257A (en) * | 2007-05-14 | 2008-11-19 | Fircroft Consulting Ltd | Fire or smoke detector with integral alarm signal and two acoustic cavities |
WO2014125302A1 (en) * | 2013-02-18 | 2014-08-21 | Bae Systems Plc | Integrated lighting and network interface device |
EP2804159A1 (en) | 2013-05-17 | 2014-11-19 | Hager Security | Electronic device provided with a sound-emitting means |
US11961380B2 (en) | 2018-06-05 | 2024-04-16 | Electronic Modular Services Ltd. | Smoke chamber as audio chamber in audible alarm devices |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4306229A (en) * | 1976-03-17 | 1981-12-15 | Nohmi Bosai Kogyo Co., Ltd. | Smoke detector having an integral piezo-electric buzzer |
GB2089544A (en) * | 1980-12-16 | 1982-06-23 | Nakanishi Eng | Fire alarm device |
EP1258848A2 (en) * | 2001-05-19 | 2002-11-20 | Job Lizenz GmbH & Co. KG | Optical smoke detector |
-
2004
- 2004-12-23 GB GB0428143A patent/GB2421620A/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4306229A (en) * | 1976-03-17 | 1981-12-15 | Nohmi Bosai Kogyo Co., Ltd. | Smoke detector having an integral piezo-electric buzzer |
GB2089544A (en) * | 1980-12-16 | 1982-06-23 | Nakanishi Eng | Fire alarm device |
EP1258848A2 (en) * | 2001-05-19 | 2002-11-20 | Job Lizenz GmbH & Co. KG | Optical smoke detector |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008065831A1 (en) | 2006-11-29 | 2008-06-05 | Panasonic Electric Works Co., Ltd. | Fire detector |
EP2093730A1 (en) * | 2006-11-29 | 2009-08-26 | Panasonic Electric Works Co., Ltd | Fire detector |
EP2093730A4 (en) * | 2006-11-29 | 2009-12-02 | Panasonic Elec Works Co Ltd | Fire detector |
GB2449257A (en) * | 2007-05-14 | 2008-11-19 | Fircroft Consulting Ltd | Fire or smoke detector with integral alarm signal and two acoustic cavities |
GB2449257B (en) * | 2007-05-14 | 2012-01-04 | Fircroft Consulting Ltd | Detector |
WO2014125302A1 (en) * | 2013-02-18 | 2014-08-21 | Bae Systems Plc | Integrated lighting and network interface device |
EP2804159A1 (en) | 2013-05-17 | 2014-11-19 | Hager Security | Electronic device provided with a sound-emitting means |
FR3005772A1 (en) * | 2013-05-17 | 2014-11-21 | Hager Security | ELECTRONIC DEVICE PROVIDED WITH A SOUND TRANSMITTING MEANS |
US11961380B2 (en) | 2018-06-05 | 2024-04-16 | Electronic Modular Services Ltd. | Smoke chamber as audio chamber in audible alarm devices |
Also Published As
Publication number | Publication date |
---|---|
GB0428143D0 (en) | 2005-01-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |