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EP 2 093 730 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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26.06.2013 Bulletin 2013/26 |
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Date of filing: 22.10.2007 |
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International Patent Classification (IPC):
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International application number: |
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PCT/JP2007/070537 |
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International publication number: |
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WO 2008/065831 (05.06.2008 Gazette 2008/23) |
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FIRE DETECTOR
FEUERDETEKTOR
DÉTECTEUR D'INCENDIE
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Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO
SE SI SK TR |
(30) |
Priority: |
29.11.2006 JP 2006321307
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Date of publication of application: |
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26.08.2009 Bulletin 2009/35 |
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Proprietor: Panasonic Corporation |
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Osaka 571-8501 (JP) |
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Inventors: |
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- MUKOYAMA, Fumiyoshi
Osaka 540-6207 (JP)
- SAKAMOTO, Koji
Osaka 540-6207 (JP)
- SHIMADA, Yoshitake
Osaka 540-6207 (JP)
- KAWANO, Yasuyuki
Osaka 540-6207 (JP)
- WADA, Takeshi
Osaka 540-6207 (JP)
- YOSHITSURU, Tomohiro
Osaka 540-6207 (JP)
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(74) |
Representative: Appelt, Christian W. |
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Boehmert & Boehmert
Pettenkoferstrasse 20-22 80336 München 80336 München (DE) |
(56) |
References cited: :
DE-U1- 8 210 633 JP-A- 07 105 461 JP-A- 2003 281 641 JP-A- 2006 146 305
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GB-A- 2 421 620 JP-A- 2003 281 641 JP-A- 2005 309 798
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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TECHNICAL FIELD
[0001] The present invention relates to a fire alarm that is installed in a room in a building
and issues a fire alarm when detecting smoke or heat or the like.
BACKGROUND ART
[0002] In a conventional fire alarm that is installed in a room, as shown in Japanese Patent
Publication No.
11-16064, a detection head is fixed to a base that is fixed to the ceiling, and smoke that
is generated within the room enters the detection head, and fire determination is
carried out depending on the smoke density. The detection head is enclosed by an insect-proof
net barrel, to prevent the ingress of insects and other foreign matters into the detection
head, to maintain accurate fire determination. This type of fire alarm is constituted
to transmit a fire alarm signal to an external device when it is determined that a
fire has occurred.
[0003] Document
JP 2003-281641 discloses a smoke sensor with an alarm buzzer, a sensor base and a sensor head containing
a smoke sensing part mounted under the sensor base, while the alarm buzzer is arranged
is under the sensor head.
[0004] Furthermore, document
GB 2 421 620 A discloses a fire alarm sounder with an acoustic cavity located immediately behind
the surface, which is most remote from the mounting surface. This surface, being most
remote from the mounting surface is provided with apertures, which allow the sound
to be emitted.
[0005] Recently there has been demand for residents to be accurately warned of the occurrence
of a fire by voice, not by an ambiguous sound such as a buzzer or the like, when a
fire occurs, so it is desirable that a speaker that issues the fire alarm in the form
of a voice be added, in particular it is desirable to that the speaker be incorporated
in the fire alarm itself.
DISLCOSURE OF THE INVENTION
[0006] The invention is defined by the subject matter of the independent claims. Advantageous
embodiments of the invention are subject to the dependent claims.
[0007] In view of the above, the present invention has been achieved to provide a fire alarm
which incorporates a speaker issuing a fire alarm voice. The fire alarm in accordance
with the present invention includes a base adapted to be installed in a room of a
premises, a detector head mounted on the base for detection of a fire condition; and
an insect-proof net barrel covering the detection head. The detection head has a sensor
which is disposed in an air of the room for sensing smoke or heat. The insect-proof
net barrel surrounding the detection head is coupled at its upper end to the detection
head or the base, and carries at its lower end the speaker. The base is provided with
a circuit board which mounts electronic parts forming an alarm sound generation circuit
that processes an output from the sensor to generate a fire alarm sound and issue
the fire alarm sound from the speaker when the output satisfies a predetermined fire
determination criteria. Thus, the speaker makes the use of the insect-proof net barrel
and is be mounted to the detection head together with the insect-proof barrel such
that the speaker is disposed below the detection head for spreading the fire alarm
voice message into the room.
[0008] The fire alarm of the invention further comprises an electrical circuit for vibrating
the insect-proof net barrel by periodically outputting an appropriate sound outside
the auditable range from said speaker (80) to thereby clean the insect-proof net barrel.
[0009] Preferably, the insect-proof net barrel has its upper and lower end opened, and is
divided by a partition wall into an upper barrel and a lower barrel. In this instance,
the speaker is accommodated within the lower barrel, while the upper barrel surrounds
the detection head in an overlapping relation therewith. The upper barrel is formed
in its peripheral wall with net holes for introducing the room air into the detection
head.
[0010] The detection head is shaped to have a barrel having a number of slits for introduction
of smoke generated in the room. Mounted within the detection head are a light source
and the sensor configured to receive a light from the light source for detecting a
smoke density based upon a variation of the intensity of the received light. The detection
head has its lower opening closed by the partition wall. Accordingly, the insect-proof
net barrel is given functions of preventing the entry of the light from below the
detection head and holding the speaker, in addition to its insect-proof function,
thereby reducing the number of components constituting the fire alarm.
[0011] In order to provide the speaker of open-type for improving efficiency, the partition
wall of the insect-proof net barrel is formed with a plurality of tiny holes which
communicate with the interior of the detection head for making the speaker open back
through the detection head. In this instance, the speaker conceals therebehind the
tiny holes for preventing the light from passing into the detection head through the
tine holes.
[0012] It is also preferred that the lower barrel of the insect-proof net barrel is formed
in its peripheral wall with air vents. In this instance, the air vents can release
the pressure developed behind the vibrator of the speaker.
[0013] It is possible to use the insect-proof net barrel without the partition wall. In
such instance, the speaker held at the lower end of the insect-proof net barrel is
used to close the lower end of the detection head.
[0014] The upper barrel of the insect-proof net barrel may be tapered to have its diameter
smaller towards its lower end. In this instance, the insect-proof net barrel is preferably
provided with a plurality of circumferential ribs extending circumferentially of the
upper barrel, and a plurality of vertical ribs crossing with the circumferential ribs
to form a lattice which defines therein net holes opened radially outwardly as well
as axially downwardly of the insect-proof net barrel. With this arrangement, foreign
matters such as insects entrapped to the lattice can be dropped downward by their
weight or by the vibration of the speaker for preventing the entry into the detection
head.
[0015] The fire alarm of the present invention is preferred to include a head cover (60)
configured to surround the insect-proof net barrel and cover the speaker. The head
cover is a top-opened barrel and is detachably at its top to the base. The head cover
is formed in its periphery with windows through which the sensor is exposed to the
room air, and is formed in its bottom with sound holes for passing therethrough the
sound of the speaker. Thus, the insect-proof net barrel and the speaker can be concealed
within the head cover to give an improved aesthetic appearance to the fire alarm.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016]
Fig. 1 is a perspective diagram of a fire alarm according to an embodiment of the
present invention;
Fig. 2 is a front section diagram of the above fire alarm;
Fig. 3 is an exploded perspective diagram of the above fire alarm;
Fig. 4 is a bottom diagram showing the detection head of the above fire alarm;
Fig. 5 is a perspective diagram showing the insect-proof net barrel used in the above
fire alarm;
Fig. 6 is a cross-section diagram showing the above insect-proof net barrel;
Fig. 7 is an exploded perspective diagram of the main parts of the above fire alarm;
Fig. 8 is an exploded front diagram of the main parts of the above fire alarm;
Fig. 9 is an exploded section diagram of the main parts of the above fire alarm;
Fig. 10 is an exploded perspective diagram showing a modified form of the insect-proof
net barrel used in the above fire alarm; and
Fig. 11 is an enlarged perspective diagram showing a part of the above insect-proof
net barrel.
BEST MODE FOR CARRYING OUT THE INVENTION
[0017] A fire alarm according to an embodiment of the present invention is explained based
on Figs. 1 through 9. The fire alarm is designed to determine whether a fire has occurred
based on the density of smoke that occurs within a room, and is provided with a detection
head 30, that measures the smoke density, on a base 10 that is fixed to the surface
of the ceiling within a room. The fire alarm includes an insect-proof net barrel 50
that covers the periphery of the detection head 30, a head cover 60 that covers the
periphery of the insect-proof net barrel 50, and a base cover 20 that covers the base
10 on the outside of the head cover 60, and a speaker 80 that sounds a fire alarm
voice signal is retained on the bottom end of the insect-proof net barrel 50.
[0018] The base 10 includes a first base 11 that is fixed to the constructed surface of
the building, and a second base 12 to which the detection head 30 is fixed, and the
two are joined by screws to become integral. A circuit board 14 on which electronic
parts are mounted to constitute a circuit for fire determination is fixed to the second
base 12.
[0019] The detection head 30 is a cylindrical body provided with a plurality of slits 32
in the circumferential wall, and the top end is fixed to the circuit board 14. As
shown in Fig. 4, the circumferential wall of the detection head 30 has a plurality
of curved fins 31 arranged in the circumferential direction, with the slits formed
between the fins. The fins 31 are constituted to guide air from outside to the inside
through the slits 32, but to prevent the ingress of light. An LED 34 that is mounted
on the circuit board 14 and a photodiode (PD) 35 that receives the light from the
LED project into the interior space of the detection head 30, and light scattered
by smoke that is guided into the detection head 30 is detected by the photodiode 35,
and the density of the smoke is obtained from the strength of the light. The smoke
density is detected by a detection circuit that is realized by an IC chip 15 mounted
on the circuit board 14. This detection circuit is configured to output the fire alarm
signal when the detection circuit detects the smoke density which exceeds a predetermined
threshold value. A voice generation circuit is likewise realized by the IC chip. The
voice generation circuit generates a fire alarm message on the basis of the fire alarm
signal, and outputs the voice from the speaker.
[0020] The LED 34, the photodiode 36, and a battery 18 that supplies electrical power to
the IC chip 15 are retained on the second base 12. A circuit is also formed in the
IC chip 15 that monitors the capacity of the battery 18, and when the capacity of
the battery is less than a predetermined value, the circuit generates a battery alarm
signal by voice, and the battery alarm signal is output from the speaker 80.
[0021] As shown in Fig. 5 and Fig. 6, the insect-proof net barrel 50 is formed in a cylindrical
shape from resin with both the top and bottom ends open, and is divided into an upper
barrel 51 and a lower barrel 52 by a partition wall 55 formed in the interior. A projection
53 is formed in the top end of the upper barrel 51. This projection 53 is engaged
with a catch 33 which is provided in the outer periphery of the detection head 30,
so that the insect-proof net barrel 50 is removably attached to the detection head
30, and the upper barrel 51 covers the area around the lower end of the detection
head 30. A plurality of net holes 54 that communicate with the slits 32 of the detection
head 30 is formed in the circumferential wall of the upper barrel 51, so that air
within the room proceeds into the interior space of the detection head 30 via the
net holes 54.
[0022] The lower barrel 52 is provided with a structure to house the speaker 80. A voice
coil case that projects from the rear surface of the speaker 80 is fixed and engaged
to an installation recess 74 formed in the center of the partition wall 55, and a
circular frame 82 that surrounds the outer periphery of the speaker 80 is fixed to
the internal wall of the lower barrel 52. A plurality of tiny holes 58 that communicates
with the space within the detection head 30 is formed in the partition wall 55, so
that by opening the back of the speaker 80 to the outside via the detection head 30
the speaker becomes an open-type and the efficiency is increased. Also, projections
56, 57 that project into the detection head 30 are formed on the partition wall 55,
and the projections are combined with an LED base 36 and a PD base 37 of the detection
head 30, to constitute a guide for the light emitted from the LED and a mask for the
light received by the PD respectively. In other words, the projection 56, 57 cooperate
with members inside the detection head 30 to construct the optical structure for detection
of smoke by the detection head 30.The lower barrel 52 is provided at its circumferential
wall with air bents 59 which open to the rear side of the speaker 80. Sound pressure
is developed behind the speaker 80. The air vents 59 cooperate with tiny holes 58
to release the sound pressure to the outside. A lead wire (not shown on the drawings)
that extends from the speaker 80 passes through a part of the tiny holes 58 and is
connected electrically to the circuit board 14, for outputting the fire alarm messages
and low battery alarms generated by the voice generation circuit.
[0023] The head cover 60 is a cylindrical body which covers the insect-proof net barrel
50. The head cover 60 has a top end and the bottom end. The top end of the head cover
is removably fitted to the peripheral edge of a central aperture 22 of the base cover
20 which covers the bottom surface of the base 10. The bottom end of the head cover
60 is formed with the bottom wall which conceals the speaker 80. A plurality of sound
holes 62 is formed in the bottom wall of the head cover 60, and the voice output of
the speaker is emitted into the room via the sound holes 62. The circumferential wall
of the head cover 60 is formed with windows 64. These windows 64 are communicated
with the slits 32 of the detection head 30 via the net holes 54 of the upper barrel
51 through the net holes 54, and also are communicated with the air vents 59 of the
lower barrel 52 through the net holes 54.
[0024] In the embodiment shown in the drawings, an example is shown in which a gap is provided
between the outer periphery of the speaker 80 and the inside wall of the insect-proof
net barrel 50, and the speaker 80 is fixed to the insect-proof net barrel 50, but
the circular frame that surrounds the outer periphery of the speaker 80 may be in
close contact with the inside wall of the lower barrel 52 of the insect-proof net
barrel 50.
[0025] Fig. 10 shows a modified example of the insect-proof net barrel that can be applied
to the above embodiment. Similar to the above embodiment, this insect-proof net barrel
50A is a cylinder partitioned internally into an upper barrel 51 A and a lower barrel
52A by a partition wall 55A, and the upper barrel 51 A is tapered to have its diameter
smaller towards its lower end. The upper barrel 51A is provided with a plurality of
circumferential ribs 71 extending circumferentially, and a plurality of vertical ribs
72 crossing with the circumferential ribs to form a lattice, and net holes 54A are
formed in the lattice. By giving the upper barrel 51 A a tapered shape, each net hole
54A is opened in the radial direction and in the axial downward direction of the insect-proof
net barrel 50A as shown in Fig. 11. Therefore insects and dust that adhere to the
lattice can be made to fall down by applying vibrations to the insect-proof net barrel
50A so it is possible to prevent the net holes 54A from becoming blocked. These insects
and dust can also be expected to fall down due to gravity, but they can be effectively
removed from the insect-proof net barrel 50A by external vibrations. In particular,
by using the speaker 80, preferably the insect-proof net barrel 50A is vibrated by
the sound generated by the speaker. In this case, in order to make the sound pressure
developed behind the speaker 80 act on the partition wall 55A, as shown in Fig. 10,
preferably holes that communicate with the detection head are not provided in the
partition wall 55A. In order to periodically clean the insect-proof net barrel 50A,
an electrical circuit for periodically outputting an appropriate sound from the speaker
may be provided separately from the voice generation circuit, and in this case the
sound may be outside the audible range, instead of a voice. As shown in the drawings,
air vents 59A that open into the rear surface of the speaker 80 may be provided in
the circumferential wall of the lower barrel 52A, to make the speaker an open-type,
but in order to effectively apply vibrations to the insect-proof net barrel 50A, the
air vents 59A may be eliminated to give an enclosed speaker structure.
[0026] In this modified form, the speaker 80 is retained by the circular frame 82, and by
closely engaging the circular frame 82 within the lower barrel, the speaker 80 is
retained within the insect-proof net barrel 50A. The circular frame 82 has a cover
84 that covers the vibrator of the speaker 80, and sound holes 86 are formed in the
cover 84.
1. A fire alarm comprising:
a base (10) adapted to be installed in a room of a premises;
a detector head (30) mounted on said base (10) for detection of a fire condition;
and
an insect-proof net barrel (50, 50A) covering said detection head, wherein said detection
head has a sensor (35) which is disposed in an air of the room for sensing smoke or
heat;
wherein said insect-proof net barrel (50, 50A) surrounds said detection head (30),
and is coupled at its upper end to said detection head (30) or said base (10), while
carrying at its lower end a speaker (80); and
wherein said base (10) is provided with a circuit board (14) which mounts electronic
parts forming an alarm sound generation circuit that processes an output from said
sensor (35) to generate a fire alarm sound and issue said fire alarm sound from said
speaker (80) when said output satisfies a predetermined fire determination criteria;
characterized
an electrical circuit for cleaning said insect-proof net barrel (50, 50A) by periodically
outputting an appropriate sound outside the audible range from said speaker (80) to
thereby vibrate the insect-proof net barrel (50, 50A).
2. A fire alarm as set forth in claim 1, wherein said insect-proof net barrel (50, 50A)
has its upper and lower end opened, and is divided by a partition wall (55, 55A) into
an upper barrel (51, 51A) and a lower barrel (52, 52A),
said upper barrel (51, 51A) surrounding said detection head (30), and being formed
in its peripheral wall with net holes (54) for introducing the room air into said
detection head (30);
said lower barrel (52, 52A) accommodating therein said speaker (80).
3. A fire alarm as set forth in claim 2, wherein said detection head (30) is shaped to
have a barrel having a number of slits for introduction of smoke generated in the
room,
wherein said sensor (35) is configured to receive a light from a light source disposed
in said detection head so as to detect a smoke density based upon a variation of the
intensity of the received light, and
wherein said detection head has its lower opening closed by said partition wall (55,
55A).
4. A fire alarm as set forth in claim 1, wherein said insect-proof net barrel (50, 50A)
is shaped to have its upper and lower end opened, and said speaker (80) is accommodated
within a lower end of said insect-proof net barrel (50, 50A) so as be held herein.
5. A fire alarm as set forth in claim 2, wherein said upper barrel (51, 51A) is tapered
to have its diameter smaller towards its lower end,
said insect-proof net barrel (50, 50A) being provided with a plurality of circumferential
ribs extending circumferentially of said upper barrel (51, 51A), and a plurality of
vertical ribs crossing with said circumferential ribs to form a lattice which defines
therein net holes (54A) opened radially outwardly as well as axially downwardly of
said insect-proof net barrel (50, 50A).
6. A fire alarm as set forth in claim 1, further including a head cover (60) configured
to surround said insect-proof net barrel (50, 50A) and to cover said speaker (80),
said head cover (60) being in the form of a top-opened and bottom-closed barrel, and
being detachably coupled at its top with said base (10) so as to expose said sensor
(35) to the room air through windows formed in the periphery of said head cover (60),
said head cover (60) being formed in its bottom with sound holes (58) for passing
therethrough the sound from said speaker (80).
7. A method for cleaning a fire alarm as set forth in one of claims 1 to 6, characterized by the step of outputting, by said electric circuit of the fire alarm, an appropriate
sound outside the audible range from said speaker (80) of the fire alarm to thereby
vibrate the insect-proof net barrel (50, 50A) of the fire alarm.
1. Feuermelder, der umfasst:
eine Basis (10), die zur Anbringung in einem Raum eines Gebäudes ausgebildet ist;
einen an der Basis (10) angebrachten Detektionskopf (30) zur Feststellung eines Brandzustands;
und
eine insektensichere Netztrommel (50, 50A), die den Detektionskopf abdeckt, wobei
der Detektionskopf einen Sensor (35) aufweist, der in der Luft des Raums angeordnet
ist, um Rauch oder Hitze festzustellen;
wobei die insektensichere Netztrommel (50, 50A) den Detektionskopf (30) umgibt und
an ihrem oberen Ende mit dem Detektionskopf (30) oder der Basis (10) gekoppelt ist,
während sie an ihrem unteren Ende einen Lautsprecher (80) trägt; und
wobei die Basis (10) mit einer Leiterplatte (14) versehen ist, auf der elektronische
Teile angebracht sind, die eine Alarmtonerzeugungsschaltung bilden, welche einen Ausgang
von dem Sensor (35) verarbeitet, um einen Feueralarmton zu erzeugen und den Feueralarmton
von dem Lautsprecher (80) auszugeben, wenn der Ausgang ein vorherbestimmtes Brandbestimmungskriterium
erfüllt;
gekennzeichnet durch
eine elektrische Schaltung zur Reinigung der insektensicheren Netztrommel (50, 50A)
durch periodisches Ausgeben eines geeigneten Tons außerhalb des Hörbereichs von dem Lautsprecher
(80), um dadurch die insektensichere Netztrommel (50, 50A) vibrieren zu lassen.
2. Feuermelder nach Anspruch 1, wobei die insektensichere Trommel (50, 50A) ein oberes
und ein unteres Ende, die offen sind, aufweist und durch eine Trennwand (55, 55A)
in eine obere Trommel (51, 51A) und eine untere Trommel (52, 52A) geteilt ist,
wobei die obere Trommel (51, 51A) den Detektionskopf (30) umgibt und an ihrer Umfangswand
mit Netzöffnungen (54) zur Einbringung der Raumluft in den Detektionskopf (30) ausgeführt
ist;
wobei in der unteren Trommel (52, 52A) der Lautsprecher (80) untergebracht ist.
3. Feuermelder nach Anspruch 2, wobei der Detektionskopf (30) so geformt ist, dass er
eine Trommel mit einer Anzahl von Schlitzen zur Einbringung von Rauch, der in dem
Raum erzeugt wird, aufweist,
wobei der Sensor (35) dazu gestaltet ist, ein Licht von einer Lichtquelle, die in
dem Detektionskopf angeordnet ist, zu empfangen, um auf Basis einer Veränderung der
Intensität des empfangenen Lichts eine Rauchdichte festzustellen, und
wobei die untere Öffnung des Detektionskopfs durch die Trennwand (55, 55A) verschlossen
ist.
4. Feuermelder nach Anspruch 1, wobei die insektensichere Netztrommel (50, 50A) so geformt
ist, dass ihr oberes und ihr unteres Ende offen sind, und der Lautsprecher (80) so
in einem unteren Ende der insektensicheren Netztrommel (50, 50A) untergebracht ist,
dass er darin gehalten wird.
5. Feuermelder nach Anspruch 2, wobei die obere Trommel (51, 51A) so abgeschrägt ist,
dass ihr Durchmesser zu ihrem unteren Ende hin kleiner wird,
wobei die insektensichere Netztrommel (50, 50A) mit mehreren peripheren Rippen, die
sich in der Umfangsrichtung der oberen Trommel (51, 51A) erstrecken, und mehreren
senkrechten Rippen, die die umfänglichen Rippen kreuzen, versehen ist, um ein Gitter
zu bilden, das Netzlöcher (54A) der insektensicheren Netztrommel (50, 50A) definieren,
die sich radial auswärts wie auch in der Achsenrichtung nach unten öffnen.
6. Feuermelder nach Anspruch 1, ferner umfassend einen Kopfdeckel (60), der dazu gestaltet
ist, die insektensichere Netztrommel (50, 50A) zu umgeben und den Lautsprecher (80)
abzudecken, wobei der Kopfdeckel (60) die Form einer an der Oberseite offenen und
an der Unterseite geschlossenen Trommel aufweist und an seiner Oberseite abnehmbar
mit der Basis (10) gekoppelt ist, um den Sensor (35) der Raumluft durch Fenster, die
in dem Umfang des Kopfdeckels (60) gebildet sind, auszusetzen,
wobei der Kopfdeckel (60) an seiner Unterseite mit Schalllöchern (58) ausgeführt ist,
wodurch der Ton von dem Lautsprecher (80) geführt wird.
7. Verfahren zur Reinigung eines Feuermelders nach einem der Ansprüche 1 bis 6, gekennzeichnet durch den Schritt des Ausgebens eines geeigneten Tons außerhalb des Hörbereichs durch die elektrische Schaltung des Feuermelders von dem Lautsprecher (80) des Feuermelders,
um dadurch die insektensichere Netztrommel (50, 50A) des Feuermelders vibrieren zu lassen.
1. Alarme incendie comprenant:
une base (10) adaptée pour être installée dans une pièce d'un bâtiment;
une tête de détection (30) montée sur ladite base (10) pour la détection d'une condition
d'incendie; et
un corps cylindrique de grille à l'épreuve des insectes (50, 50A) recouvrant ladite
tête de détection, dans laquelle ladite tête de détection a un capteur (35) qui est
disposé dans un air de la pièce pour détecter la fumée ou la chaleur;
dans laquelle ledit corps cylindrique de grille à l'épreuve des insectes (50, 50A)
entoure ladite tête de détection (30), et est couplé au niveau de son extrémité supérieure
à ladite tête de détection (30) ou à ladite base (10), tout en portant au niveau de
son extrémité inférieure, un haut-parleur (80); et
dans laquelle ladite base (10) est prévue avec une carte de circuit imprimé (14) qui
permet de monter des pièces électroniques formant un circuit de génération de son
d'alarme qui traite un résultat dudit capteur (35) pour générer un son d'alarme incendie
et émettre ledit son d'alarme incendie à partir dudit haut-parleur (80) lorsque ledit
résultat satisfait un critère de détermination d'incendie prédéterminé;
caractérisée par:
un circuit électrique pour nettoyer ledit corps cylindrique de grille à l'épreuve
des insectes (50, 50A) en émettant périodiquement un son approprié hors de la plage
audible à partir dudit haut-parleur (80) pour faire vibrer ainsi le corps cylindrique
de grille à l'épreuve des insectes (50, 50A).
2. Alarme incendie selon la revendication 1, dans laquelle ledit corps cylindrique de
grille à l'épreuve des insectes (50, 50A) a ses extrémités supérieure et inférieure
ouvertes, et est divisé par une paroi de séparation (55, 55A) en un corps cylindrique
supérieur (51, 51A) et en un corps cylindrique inférieur (52, 52A),
ledit corps cylindrique supérieur (51, 51A) entourant ladite tête de détection (30)
et étant formé dans sa paroi périphérique avec des trous de grille (54) pour introduire
l'air ambiant dans ladite tête de détection (30);
ledit corps cylindrique inférieur (52, 52A) logeant à l'intérieur dudit haut-parleur
(80).
3. Alarme incendie selon la revendication 2, dans laquelle ladite tête de détection (30)
est formée pour avoir un corps cylindrique ayant un certain nombre de fentes pour
l'introduction de la fumée générée dans la pièce,
dans laquelle ledit capteur (35) est configuré pour recevoir une lumière d'une source
de lumière disposée dans ladite tête de détection afin de détecter une densité de
fumée en fonction d'une variation de l'intensité de la lumière reçue, et
dans laquelle ladite tête de détection a son ouverture inférieure fermée par ladite
paroi de séparation (55, 55A).
4. Alarme incendie selon la revendication 1, dans laquelle ledit corps cylindrique de
grille à l'épreuve des insectes (50, 50A) est formé pour avoir ses extrémités supérieure
et inférieure ouvertes, et ledit haut-parleur (80) est logé à l'intérieur d'une extrémité
inférieure dudit corps cylindrique de grille à l'épreuve des insectes (50, 50A) afin
d'y être maintenu.
5. Alarme incendie selon la revendication 2, dans laquelle ledit corps cylindrique supérieur
(51, 51A) est progressivement rétréci pour avoir son diamètre plus petit vers son
extrémité inférieure,
ledit corps cylindrique de grille à l'épreuve des insectes (50, 50A) étant prévu avec
une pluralité de nervures circonférentielles s'étendant de manière circonférentielle
dudit corps cylindrique supérieur (51, 51A), et une pluralité de nervures verticales
coupant lesdites nervures circonférentielles afin de former un treillis qui définit
à l'intérieur de ce dernier des trous de grille (54A) ouverts radialement vers l'extérieur
ainsi qu'axialement vers le bas dudit corps cylindrique de grille à l'épreuve des
insectes (50, 50A).
6. Alarme incendie selon la revendication 1, comprenant en outre un couvercle de tête
(60) configuré pour entourer ledit corps cylindrique de grille à l'épreuve des insectes
(50, 50A) et pour recouvrir ledit haut-parleur (80), ledit couvercle de tête (60)
ayant la forme d'un corps cylindrique à sommet ouvert et fond fermé, et étant couplé
de manière détachable au niveau de son sommet avec ladite base (10) afin d'exposer
ledit capteur (35) à l'air ambiant par des fenêtres formées dans la périphérie dudit
couvercle de tête (60),
ledit couvercle de tête (60) étant formé dans son fond avec des trous de son (58)
pour laisser passer le son provenant dudit haut-parleur (80).
7. Procédé pour nettoyer une alarme incendie selon l'une des revendications 1 à 6, caractérisé par l'étape consistant à émettre, grâce audit circuit électrique de l'alarme incendie,
un son approprié hors de la plage audible à partir dudit haut-parleur (80) de l'alarme
incendie afin de faire vibrer ainsi le corps cylindrique de grille à l'épreuve des
insectes (50, 50A) de l'alarme incendie.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description