JP2012133819A

JP2012133819A - Fire alarm

Info

Publication number: JP2012133819A
Application number: JP2012087086A
Authority: JP
Inventors: Yasutoku Oya; 泰徳大矢; Seiji Tsubouchi; 清治壷内; Toshiyuki Ikeda; 俊之池田
Original assignee: Nittan Co Ltd
Current assignee: Nittan Co Ltd
Priority date: 2012-04-06
Filing date: 2012-04-06
Publication date: 2012-07-12
Anticipated expiration: 2027-09-25
Also published as: JP5291821B2

Abstract

PROBLEM TO BE SOLVED: To facilitate attachment and detachment of a notification means to and from a casing which accommodates a fire sensing means and the notification means.SOLUTION: A fire alarm has a casing 2 which accommodates fire sensing means 6 for sensing a fire and notification means 110 for notifying that the fire sensing means has sensed a fire; and a cover which is detachably attached to the casing and covers the notification means. The notification means has a loudspeaker for notifying the sensing of a fire by the fire sensing means with a sound. The casing is integrally provided with an accommodating wall part 24 formed in such a manner that it surrounds the outer periphery of the loudspeaker and locking claws 25 which lock the loudspeaker in such a manner that detachment of the loudspeaker from an accommodating area formed by being surrounded by the accommodating wall part is prevented.

Description

本発明は、住宅等に設置される火災警報器に関する。 The present invention relates to a fire alarm installed in a house or the like.

火災警報器は、住宅等の天井や壁に設けられており、火災時の煙や熱を感知して火災が発生している旨の警報を行う。
火災警報器は、煙等で火災を検出した場合に、正常に警報することができるように定期的に作動するか否かの試験を行う必要がある。そのため、火災警報器の前面には、警報を作動させる又は警報を停止させる操作片が設けられている。この操作片を押動操作することにより、または、予め火災警報器内部で操作片に結ばれて火災警報器の外部へ延出されたスイッチ用の引き紐を引き操作して操作片を連動させる。これにより、操作片が作動し、火災警報器に内蔵されたスイッチが押圧されて、報知部から警報が放音出力される。また、再度、この操作片を操作することにより火災警報器内のスイッチが押圧されて警報停止を行うことができる（例えば、特許文献１参照）。 The fire alarm is provided on the ceiling or wall of a house, etc., and detects the smoke and heat at the time of the fire and warns that a fire has occurred.
It is necessary to test whether or not the fire alarm operates periodically so that it can be normally alarmed when a fire is detected by smoke or the like. Therefore, an operation piece for activating or stopping the alarm is provided on the front surface of the fire alarm. The operation piece is operated by pushing the operation piece or by pulling a pulling cord for a switch that is previously connected to the operation piece inside the fire alarm device and extends to the outside of the fire alarm device. . As a result, the operation piece is activated, a switch built in the fire alarm is pressed, and an alarm is emitted from the notification unit. Further, by operating this operation piece again, the switch in the fire alarm can be pressed to stop the alarm (for example, see Patent Document 1).

特開２００７−１２２４１４号公報JP 2007-122414 A

しかし、従来の火災警報器にあっては、操作片と引き紐との連結部が火災警報器内に収容されていた。そのため、引き紐を操作片に結びつける際に、火災警報器を一旦分解して引き紐を操作片に結びつけ、その後再び火災警報器を組み立てて引き紐を火災警報器の外部に導く必要があり、手間がかかるという問題があった。
また、従来の火災警報器にあっては、引き紐を使用しない場合には、室内の景観を損なうことから、引き紐を操作片から取り外すが、再度使用する際に、取り外した引き紐を紛失してしまうおそれもあった。 However, in the conventional fire alarm, the connection part of an operation piece and a drawstring was accommodated in the fire alarm. Therefore, when tying the drawstring to the operation piece, it is necessary to disassemble the fire alarm once and tie the drawstring to the operation piece, and then assemble the fire alarm again to guide the drawstring to the outside of the fire alarm. There was a problem that it took time and effort.
Also, with conventional fire alarms, if the drawstring is not used, the indoor landscape will be damaged, so the drawstring is removed from the operation piece, but when it is used again, the removed drawstring is lost. There was also a risk of doing so.

また、従来の火災警報器にあっては、報知部に圧電振動板を使用することが一般的であったが、この圧電振動板は、音声を増幅する構造を警報機のカバー内に設ける必要があり、且つ当該音声増幅構造との密接接続を図る必要性からねじ止めされることが一般的であった。そして、火災報知器の製造工程において、圧電振動板のねじ止め作業が煩雑となり、作業効率の低下を招いていた。また、報知手段のネジ止め作業は、故障や点検等で着脱する際にも煩雑になるという問題があった。
本発明は、操作片に引き紐を結びつける際の手間を軽減することをその目的とする。
また、本発明は、引き紐の紛失を防止することを他の目的とする。
また、本発明は、報知手段の着脱を容易にすることを他の目的とする。 Moreover, in the conventional fire alarm, it was common to use a piezoelectric diaphragm for the alarm unit, but this piezoelectric diaphragm needs to be provided with a structure for amplifying sound in the cover of the alarm device. In general, it is screwed because of the necessity of close connection with the sound amplification structure. And in the manufacturing process of the fire alarm, the screwing operation of the piezoelectric diaphragm becomes complicated, and the working efficiency is lowered. Further, the screwing operation of the notification means has a problem that it is complicated even when it is attached / detached due to failure or inspection.
It is an object of the present invention to reduce the labor involved in tying a drawstring to an operation piece.
Another object of the present invention is to prevent the drawstring from being lost.
Another object of the present invention is to facilitate attachment / detachment of the notification means.

請求項１記載の発明は、火災を感知する火災感知手段と、該火災感知手段が火災を感知した旨を報知する報知手段と、が設けられる筐体と、該筐体に着脱自在に設けられ、前記報知手段を覆うカバーと、を備え、前記報知手段は、前記火災感知手段による火災の感知を音によって報知するスピーカを有し、前記筐体に、前記スピーカの外周を取り囲むように形成された収容壁部と、前記収容壁部に囲まれて形成される収容領域からの前記スピーカの離脱を防止するように当該スピーカを係止する係止爪と、を一体に設ける、という構成を採っている。 The invention according to claim 1 is provided with a casing provided with a fire detecting means for detecting a fire, and a notifying means for notifying that the fire detecting means has detected a fire, and is detachably provided on the casing. And a cover for covering the notification means, the notification means having a speaker for notifying the detection of fire by the fire detection means by sound, and formed in the casing so as to surround the outer periphery of the speaker. And a locking claw for locking the speaker so as to prevent the speaker from being detached from the storage area formed by being surrounded by the storage wall. ing.

上記構成では、報知手段にスピーカを使用するため、圧電振動板のように音声増幅構造を必須の構成としないので、ねじ止めのような強固な固定手段を必須としない。そして、報知手段を構成するスピーカは収容壁部に囲まれて形成される収容領域に収容される。このとき、係止爪は、収容領域からのスピーカの離脱を防止するようにスピーカを係止する。これにより、スピーカは筐体に形成された係止爪で収容領域への収容が可能となるので、従来のように、ネジ等を用いて筐体に固定する必要がなく、スピーカの筐体への着脱を容易にすることができ、さらには、部品点数を軽減できる。 In the above configuration, since the speaker is used as the notification unit, the sound amplification structure is not essential as in the case of the piezoelectric diaphragm, so that strong fixing means such as screwing is not essential. And the speaker which comprises an alerting | reporting means is accommodated in the accommodation area | region formed and enclosed by an accommodation wall part. At this time, the locking claw locks the speaker so as to prevent the speaker from being detached from the accommodation area. As a result, the speaker can be housed in the housing area with the locking claws formed on the housing, so that it is not necessary to fix the speaker to the housing using screws or the like as in the prior art. Can be easily attached and detached, and the number of parts can be reduced.

請求項２記載の発明は、請求項１記載の発明と同様の構成を備えると共に、前記カバーは、放音孔と、当該カバーを前記筐体に装着した際に前記スピーカに対向して前記放音孔に報知音を導く筒体を有し、前記係止爪は、前記筒体側に延出されると共に当該筒体の側壁の一部を構成する、という構成を採っている。 The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the cover has a sound emitting hole and the discharge when facing the speaker when the cover is attached to the housing. It has a cylindrical body that guides the notification sound to the sound hole, and the locking claw extends to the cylindrical body side and constitutes a part of the side wall of the cylindrical body.

上記構成では、カバーを筐体に装着するとカバーの筒体はスピーカに対向してスピーカの周囲を包み込む。ここで、係止爪は、筒体の側壁の一部を構成しているので、筒体と係止爪を別個に設ける場合に比べて省スペース化を図ることができる。
また、筒体と係止爪との嵌め込みは、カバーを筐体に装着する際のガイドとすることもできるので、カバーの筐体への装着作業を容易にすることができる。
また、筒体は、スピーカの周囲を筒状に囲む壁部となるので、スピーカから発せられた音がスピーカの周囲に散乱することを抑制して大部分が一方向に伝達され、警報効果を向上させることができる。 In the above configuration, when the cover is attached to the housing, the cover cylinder faces the speaker and wraps around the speaker. Here, since the latching claw constitutes a part of the side wall of the cylinder, space saving can be achieved as compared with the case where the cylinder and the latching claw are provided separately.
Further, the fitting between the cylinder and the locking claw can be used as a guide when the cover is mounted on the casing, and therefore, the mounting operation of the cover on the casing can be facilitated.
In addition, since the cylindrical body is a wall portion that surrounds the speaker in a cylindrical shape, the sound emitted from the speaker is suppressed from being scattered around the speaker, and most of the sound is transmitted in one direction, resulting in an alarm effect. Can be improved.

請求項３記載の発明は、請求項２記載の発明と同様の構成を備えると共に、前記スピーカは、前記報知手段の制御手段に導線を介して接続され、前記収容壁部と前記係止爪との間には、当該係止爪の撓みを許容するスリット部が形成されると共に当該スリット部から前記導線を収容領域の外側に案内する、という構成を採っている。 The invention described in claim 3 has the same configuration as that of the invention described in claim 2, and the speaker is connected to the control means of the notification means via a conductor, and the storage wall portion, the locking claw, In between, the slit part which accept | permits the said latching nail | claw is formed, and the said conducting wire is guided to the outer side of a storage area | region from the said slit part.

上記構成では、収容壁部と係止爪との間にスリット部が形成されており、このスリット部からスピーカの導線を収容領域から外側に案内することができる。これにより、スピーカの導線が他の場所に行かないようにスリット部で押さえることができるので、スピーカの配線を容易に行うことができる。
また、係止爪の撓みを許容するためのスリット部が上記スピーカの導線のガイドとしても機能するので別途導線のガイドを設ける必要がなく、火災報知器の生産性の向上を図ることが可能となる。 In the above configuration, the slit portion is formed between the housing wall portion and the locking claw, and the lead wire of the speaker can be guided from the housing region to the outside through the slit portion. Thereby, since it can hold | suppress with a slit part so that the conducting wire of a speaker may not go to another place, wiring of a speaker can be performed easily.
In addition, since the slit portion for allowing the locking claw to bend also functions as a guide for the conductor of the speaker, it is not necessary to provide a separate guide for the conductor, and it is possible to improve the productivity of the fire alarm. Become.

請求項１記載の発明では、報知手段を構成するスピーカは収容壁部に囲まれて形成される収容領域に収容される。このとき、係止爪は、収容領域からのスピーカの離脱を防止するようにスピーカを係止する。これにより、スピーカは筐体に形成された係止爪で収容領域への収容が可能となるので、従来のように、ネジ等を用いて筐体に固定する必要がなく、スピーカの筐体への着脱を容易にすることができ、さらには、部品点数を軽減できる。 According to the first aspect of the present invention, the speaker constituting the notification means is accommodated in an accommodation area formed by being enclosed by the accommodation wall portion. At this time, the locking claw locks the speaker so as to prevent the speaker from being detached from the accommodation area. As a result, the speaker can be housed in the housing area with the locking claws formed on the housing, so that it is not necessary to fix the speaker to the housing using screws or the like as in the prior art. Can be easily attached and detached, and the number of parts can be reduced.

請求項２記載の発明では、カバーを筐体に装着するとカバーの筒体はスピーカに対向してスピーカの周囲を包み込む。ここで、係止爪は、筒体の側壁の一部を構成しているので、筒体と係止爪を別個に設ける場合に比べて省スペース化を図ることができる。
また、筒体と係止爪との嵌め込みは、カバーを筐体に装着する際のガイドとすることもできるので、カバーの筐体への装着作業を容易にすることができる。
また、筒体は、スピーカの周囲を筒状に囲む壁部となるので、スピーカから発せられた音がスピーカの周囲に散乱することを抑制して大部分が一方向に伝達され、警報効果を向上させることができる。 According to the second aspect of the present invention, when the cover is attached to the housing, the cover cylinder faces the speaker and wraps around the speaker. Here, since the latching claw constitutes a part of the side wall of the cylinder, space saving can be achieved as compared with the case where the cylinder and the latching claw are provided separately.
Further, the fitting between the cylinder and the locking claw can be used as a guide when the cover is mounted on the casing, and therefore, the mounting operation of the cover on the casing can be facilitated.
In addition, since the cylindrical body is a wall portion that surrounds the speaker in a cylindrical shape, the sound emitted from the speaker is suppressed from being scattered around the speaker, and most of the sound is transmitted in one direction, resulting in an alarm effect. Can be improved.

請求項３記載の発明では、収容壁部と係止爪との間にスリット部が形成されており、このスリット部からスピーカの導線を収容領域から外側に案内することができる。これにより、スピーカの導線が他の場所に行かないようにスリット部で押さえることができるので、スピーカの導線の配線を容易に行うことができる。
また、係止爪の撓みを許容するためのスリット部が上記スピーカの導線のガイドとしても機能するので別途導線のガイドを設ける必要がなく、火災報知器の生産性の向上を図ることが可能となる。 According to the third aspect of the present invention, the slit portion is formed between the storage wall portion and the locking claw, and the lead wire of the speaker can be guided from the storage region to the outside through the slit portion. Thereby, since it can hold | suppress with a slit part so that the conducting wire of a speaker may not go to another place, wiring of the conducting wire of a speaker can be performed easily.
In addition, since the slit portion for allowing the locking claw to bend also functions as a guide for the conductor of the speaker, it is not necessary to provide a separate guide for the conductor, and it is possible to improve the productivity of the fire alarm. Become.

火災警報器の正面側を示す斜視図。The perspective view which shows the front side of a fire alarm. 火災警報器の分解斜視図。The exploded perspective view of a fire alarm. 筐体の正面側の斜視図。The perspective view of the front side of a housing | casing. 筐体の正面側の斜視図。The perspective view of the front side of a housing | casing. 凹部まわりの拡大斜視図。The expansion perspective view around a crevice. 凹部にスピーカを収容した状態での凹部まわりの拡大斜視図。The expansion perspective view around the crevice in the state where the speaker was stored in the crevice. 図６におけるＶＩＩ−ＶＩＩ断面図。VII-VII sectional drawing in FIG. 筐体の背面側の斜視図。The perspective view of the back side of a housing | casing. 筐体に形成された収容部の拡大斜視図。The expansion perspective view of the accommodating part formed in the housing | casing. 暗箱の斜視図。The perspective view of a dark box. 暗箱の内部構造を示す断面図。Sectional drawing which shows the internal structure of a dark box. 暗箱の背面板に設けられた構造を示す斜視図。The perspective view which shows the structure provided in the back plate of the dark box. カバーの背面に形成された嵌合壁部の拡大斜視図。The expansion perspective view of the fitting wall part formed in the back surface of a cover. 入力部の背面側の斜視図。The perspective view of the back side of an input part. カバーに入力部を取り付けた状態での背面側の斜視図。The perspective view of the back side in the state which attached the input part to the cover. 操作片とカバーと筐体との位置関係を説明する拡大断面図。The expanded sectional view explaining the positional relationship of an operation piece, a cover, and a housing | casing. 紐掛け部の平面図。The top view of a stringing part. 紐掛け部を引き紐により引く状態を示す斜視図。The perspective view which shows the state which pulls a stringing part with a drawstring. 紐掛け部の他の例を示す平面図。The top view which shows the other example of a stringing part.

（火災警報器の全体構成）
本発明の実施形態である火災警報器１００について図面を参照して説明する。
図１に示すように、火災警報器１００は、建造物の屋内の天井や壁面に設置され、火災により生じる煙を感知することで警報音等による報知を行うものである。
ここで、以下の説明において、火災警報器１００の設置に際して、建造物の天井の平面或いは壁面に対向する面を火災警報器１００の背面（後面）とし、その逆側の面を火災警報器１００の正面（前面）とする。なお、以下の説明において上記正面側に向かう方向を前方、背面側に向かう方向を後方として説明を行うこととする。 (Overall configuration of fire alarm)
The fire alarm device 100 which is embodiment of this invention is demonstrated with reference to drawings.
As shown in FIG. 1, the fire alarm 100 is installed on an indoor ceiling or wall surface of a building, and performs notification by an alarm sound or the like by detecting smoke generated by a fire.
Here, in the following description, when the fire alarm 100 is installed, the plane facing the wall or the wall of the building is the rear surface (rear surface) of the fire alarm 100, and the opposite surface is the fire alarm 100. The front (front). In the following description, the direction toward the front side will be described as the front, and the direction toward the back side will be described as the rear.

図１、図２に示すように、火災警報器１００は、建造物の屋内の天井や壁面にネジ等によって取り付けられるベース１と、ベース１上に設けられた筐体２と、筐体２上に設けられた回路基板３と、回路基板３上に設けられた暗箱４と、回路基板３及び暗箱４を上方から覆い、筐体２に着脱自在に設けられるカバー５と、を備えている。 As shown in FIGS. 1 and 2, the fire alarm 100 includes a base 1 that is attached to a ceiling or a wall surface of a building with screws or the like, a housing 2 provided on the base 1, and a housing 2. A circuit board 3 provided on the circuit board 3, a dark box 4 provided on the circuit board 3, and a cover 5 that covers the circuit board 3 and the dark box 4 from above and is detachably provided on the housing 2.

（ベース）
ベース１は、カバー５の外径と等しくなるように円板状に形成され、カバー５と同心となるように連結されている。ベース１は、例えば、白色の樹脂材料にて一体成形で作られている。
ベース１の背面側には、火災警報器１００が設置される天井や壁面に対してネジ止めを行うための長穴状或いは鍵穴状のネジの挿通穴１１が表裏にわたって貫通するように形成されている。
ベース１には、壁面に設けられたフックなどに火災警報器１００を吊下するための壁掛けリング１２が一体形成されている。壁掛けリング１２は、火災警報器１００を壁に吊下して設置する場合に切り離され、その基端部が取り付け穴１３に取り付けられて使用される。 (base)
The base 1 is formed in a disc shape so as to be equal to the outer diameter of the cover 5, and is connected so as to be concentric with the cover 5. The base 1 is made by, for example, integral molding with a white resin material.
On the back side of the base 1, an insertion hole 11 of a long hole or a keyhole screw for screwing the ceiling or wall surface on which the fire alarm 100 is installed is formed so as to penetrate the front and back. Yes.
The base 1 is integrally formed with a wall hanging ring 12 for hanging the fire alarm 100 on a hook or the like provided on the wall surface. The wall-hanging ring 12 is cut off when the fire alarm 100 is suspended from a wall and installed, and its base end is attached to the attachment hole 13 for use.

（筐体：正面側）
図１〜図９に示すように、筐体２は、平面視円形の皿状に形成されている。筐体２の外周には、ベース１と同径となるような壁部２０が形成されている。筐体２の上面には、回路基板３を取り付けるための軸状の取付部２１が一体に形成されている。当該取付部２１は、回路基板３に形成された嵌合穴に挿入される構造となっており、各取付部２１の間隔はわずかに各嵌合穴の間隔よりも広く設定され、これにより挿入時に各取付部２１が弾性力を生じ、これをもって回路基板３の保持を行うようになっている。
また、筐体２の上面には、カバー５の下面側に形成されたピン５ａを挿入して筐体２にカバー５を取り付けるための挿入穴２２が形成されている。 (Case: Front side)
As shown in FIGS. 1 to 9, the housing 2 is formed in a circular dish shape in plan view. A wall portion 20 having the same diameter as the base 1 is formed on the outer periphery of the housing 2. A shaft-shaped attachment portion 21 for attaching the circuit board 3 is integrally formed on the upper surface of the housing 2. The attachment portion 21 has a structure that is inserted into a fitting hole formed in the circuit board 3, and the interval between the attachment portions 21 is set slightly wider than the interval between the fitting holes. Sometimes, each mounting portion 21 generates an elastic force, and the circuit board 3 is held with this.
In addition, an insertion hole 22 for inserting the pin 5 a formed on the lower surface side of the cover 5 and attaching the cover 5 to the housing 2 is formed on the upper surface of the housing 2.

図３〜図５に示すように、筐体２には、筐体２の上面よりも下面側に凹んだ凹部２３が平面視円形状に形成されている。凹部２３には、煙を感知した旨を警報音により報知する報知手段としてのスピーカ１１０が嵌め込まれる。すなわち、凹部２３は、スピーカ１１０の収容領域となる。凹部２３の周囲には、スピーカ１１０の外周を囲む収容壁部２４が筐体２に一体形成されている。収容壁部２４は、互いに対向するように弧状に二つ形成されている。収容壁部２４の上端には、その上端から下方に向けて切り欠かれた切欠部２４ａが所定間隔をあけて形成されている。これは、スピーカ１１０の枠に形成された爪部１１０ａを嵌め込むためのものである。 As shown in FIGS. 3 to 5, the housing 2 is formed with a concave portion 23 that is recessed on the lower surface side of the upper surface of the housing 2 in a circular shape in plan view. In the recess 23, a speaker 110 is fitted as a notifying means for notifying that a smoke has been detected by an alarm sound. That is, the concave portion 23 becomes a housing area for the speaker 110. A housing wall 24 surrounding the outer periphery of the speaker 110 is formed integrally with the housing 2 around the recess 23. Two housing walls 24 are formed in an arc shape so as to face each other. At the upper end of the accommodating wall portion 24, a notch portion 24 a that is notched downward from the upper end is formed at a predetermined interval. This is for fitting the claw portion 110a formed in the frame of the speaker 110.

図５、図６に示すように、収容壁部２４の対向する端部間には、隙間が形成されている。この隙間には、筐体２の正面側に向かって起立する係止爪２５が形成されている。すなわち、係止爪２５は、収容壁部２４の一部としても機能している。
係止爪２５は、弾性を有する樹脂材料から形成されている。係止爪２５は、その先端部が収容壁部２４によって囲まれるスピーカ１１０側に張り出している。
図７に示すように、係止爪２５は、その下端部で上方に向けて折り返すように形成されて筐体２と一体形成されており、係止爪２５の撓みが可能となるよう当該係止爪２５の両側にはスリット部２６が形成され、係止爪２５の背面には空間Ｓが形成されている。
すなわち、スピーカ１１０を凹部２３に収容する際には、係止爪２５の上端部はスピーカ１１０に押されて外に広がるが、スピーカ１１０を凹部２３に収容した後は、係止爪２５の先端がスピーカ１１０の上方に張り出すように元の状態に戻る。これにより、係止爪２５は、スピーカ１１０の凹部２３からの離脱を防止する。
図５、図６に示すように、係止爪２５と収容壁部２４との間には、スリット部２６が形成されている。スリット部２６は、スピーカ１１０を凹部２３に嵌め込んだ際に、その導線１１１を凹部２３から外側に案内する機能も有している。この導線１１１は、制御手段（図示しない）に接続され、煙感知手段６（後述する）により煙が感知されると、制御手段は導線１１１を介してスピーカ１１０に音を発する指令信号を送信する。 As shown in FIGS. 5 and 6, a gap is formed between the opposing ends of the accommodation wall 24. A locking claw 25 is formed in the gap so as to stand up toward the front side of the housing 2. That is, the locking claw 25 also functions as a part of the housing wall portion 24.
The locking claw 25 is formed from a resin material having elasticity. The front end of the locking claw 25 protrudes toward the speaker 110 surrounded by the housing wall 24.
As shown in FIG. 7, the locking claw 25 is formed so as to be folded upward at the lower end portion thereof, and is integrally formed with the housing 2, so that the locking claw 25 can be bent. Slit portions 26 are formed on both sides of the pawl 25, and a space S is formed on the back surface of the locking pawl 25.
That is, when the speaker 110 is accommodated in the recess 23, the upper end portion of the locking claw 25 is pushed outward by the speaker 110 and spreads outside. However, after the speaker 110 is received in the recess 23, Returns to the original state so as to protrude above the speaker 110. Thereby, the latching claw 25 prevents the speaker 110 from being detached from the recess 23.
As shown in FIGS. 5 and 6, a slit portion 26 is formed between the locking claw 25 and the accommodating wall portion 24. The slit portion 26 also has a function of guiding the conductor 111 from the recess 23 to the outside when the speaker 110 is fitted into the recess 23. The conducting wire 111 is connected to a control means (not shown), and when smoke is sensed by the smoke sensing means 6 (described later), the control means transmits a command signal for generating a sound to the speaker 110 via the conducting wire 111. .

（筐体：背面側）
図８、図９に示すように、筐体２の背面側には、後述する引き紐Ｔを収容する収容部２７が設けられている。収容部２７は、筐体２の壁部２０と、筐体２の背面に設けられた収容壁２８とによって囲まれて形成されている。
収容部２７には、カバー５を筐体２に取り付けた際に、収容部２７に収容された引き紐Ｔと紐掛け部９４（後述する）とを隔離する隔離壁２９が形成されている。
隔離壁２９は、壁部２０から紐掛け部９４の一部を囲むように形成されている。なお、紐掛け部９４の全体を隔離壁２９で覆うことも可能であるが、紐掛け部９４への引き紐Ｔの着脱の利便性を考慮し、引き紐Ｔの装着が行われる部分は隔離壁２９を設けていない。 (Case: Back side)
As shown in FIGS. 8 and 9, a housing portion 27 that houses a drawstring T, which will be described later, is provided on the back side of the housing 2. The housing portion 27 is formed by being surrounded by the wall portion 20 of the housing 2 and a housing wall 28 provided on the back surface of the housing 2.
The accommodating portion 27 is formed with an isolation wall 29 that isolates the drawstring T accommodated in the accommodating portion 27 and the string hook portion 94 (described later) when the cover 5 is attached to the housing 2.
The isolation wall 29 is formed so as to surround a part of the string hook portion 94 from the wall portion 20. It is possible to cover the entire strap portion 94 with the isolation wall 29, but considering the convenience of attaching and detaching the drawstring T to the strap portion 94, the portion where the drawstring T is attached is isolated. The wall 29 is not provided.

（回路基板）
図２に示すように、回路基板３は、筐体２の上面に取付部２１を介して固定されている。
図２、図１０〜図１２に示すように、回路基板３には、火災発生時の煙を感知する火災感知手段としての煙感知手段６（図１１参照）と、煙感知手段６を格納する暗箱４と、押圧操作によりスピーカ１１０の作動をＯＮ／ＯＦＦするスイッチ７と、煙感知手段６の感知によりスピーカ１１０から警報音を鳴らすための回路が主に構成されている制御手段（図示略）と、を備えている。 (Circuit board)
As shown in FIG. 2, the circuit board 3 is fixed to the upper surface of the housing 2 via an attachment portion 21.
As shown in FIGS. 2 and 10 to 12, the circuit board 3 stores smoke detecting means 6 (see FIG. 11) as fire detecting means for detecting smoke when a fire occurs, and smoke detecting means 6. Control means (not shown) mainly comprising a dark box 4, a switch 7 for turning on / off the operation of the speaker 110 by a pressing operation, and a circuit for sounding an alarm sound from the speaker 110 by the detection of the smoke detection means 6. And.

（煙感知手段）
図１０〜図１２に示すように、煙感知手段６は、暗箱４内に設けられる発光素子６１（例えば発光ダイオード）と受光素子６２（例えば、フォトダイオード）とから構成される。すなわち、発光素子６１はその照射範囲が制限された状態で暗箱４内に配置され、受光素子６２は検査光が直接入射されないように受光範囲が制限された状態で暗箱４内に配置される（図１２参照）。
さらに、暗箱４内において、発光素子６１と受光素子６２とは、その照射範囲とその受光範囲とが一部が重複するように配置され、その重複領域（検煙領域Ａとする）に煙が侵入すると当該煙により発光素子６１の照射光が散乱されて受光素子６２に入射し、煙が感知されるようになっている。 (Smoke detection means)
As shown in FIGS. 10 to 12, the smoke sensing means 6 includes a light emitting element 61 (for example, a light emitting diode) and a light receiving element 62 (for example, a photodiode) provided in the dark box 4. That is, the light emitting element 61 is disposed in the dark box 4 with its irradiation range limited, and the light receiving element 62 is disposed in the dark box 4 with the light receiving range limited so that the inspection light is not directly incident ( (See FIG. 12).
Further, in the dark box 4, the light emitting element 61 and the light receiving element 62 are arranged so that the irradiation range and the light receiving range partially overlap, and smoke is generated in the overlapping area (referred to as smoke detection area A). When the light enters, the light emitted from the light emitting element 61 is scattered by the smoke and enters the light receiving element 62 so that the smoke is detected.

（制御手段）
制御手段は、その一番目の機能として、発光素子６１を点灯させると共に当該点灯時に所定値以上の光強度で受光素子６２が検出を行うと、スピーカ１１０から警報音を鳴らす処理を実行する回路が構成されている。
また、二番目の機能として、スイッチ７が押下されると、受光素子６２の検出の有無にかかわらず、スピーカ１１０から警報音を鳴らす処理を実行する回路が構成されている。 (Control means)
As a first function of the control means, when the light emitting element 61 is turned on and the light receiving element 62 detects at a light intensity equal to or higher than a predetermined value when the light emitting element is turned on, a circuit that executes a process of sounding an alarm sound from the speaker 110 It is configured.
As a second function, a circuit is configured to execute a process of sounding an alarm sound from the speaker 110 regardless of whether the light receiving element 62 is detected when the switch 7 is pressed.

（暗箱）
図１０〜図１２に示すように、暗箱４は、筐体２内において正面側となる円形の正面板４１と、背面側となる円形の背面板４２と、正面板４１と背面板４２との間において当該正面板４１又は背面板４２のいずれかに一体成形された後述する各種の構造及び暗箱４の外周を覆う図示しない防虫網から構成されている。
なお、正面板４１、背面板４２とこれらに一体成形された各種の構造は、いずれも光吸収性の高い黒色樹脂から成形されている。 (Dark box)
As shown in FIGS. 10 to 12, the dark box 4 includes a circular front plate 41 on the front side in the housing 2, a circular back plate 42 on the back side, a front plate 41 and a back plate 42. In the meantime, it is composed of various structures, which will be described later, integrally formed on either the front plate 41 or the back plate 42 and an insect repellent net (not shown) that covers the outer periphery of the dark box 4.
Note that the front plate 41, the back plate 42, and the various structures integrally formed thereon are formed from a black resin having a high light absorption property.

正面板４１と背面板４２とは、いずれも等しい外径の円板であり、同心となるように互いに連結される。
また、正面板４１と背面板４２との間には、図１１に示すように、煙感知手段６の発光素子６１の前方を除いて周囲を覆いつつ保持を行う発光素子保持部４３と、煙感知手段６の受光素子６２の前方を除いて周囲を覆いつつ保持を行う受光素子保持部４４と、暗箱４の外周近傍で外光の侵入を防止するラビリンス部４５と、発光素子６１の照射光が受光素子６２の受光領域に直接進入することを防ぐ遮蔽板４６と、発光素子６１からの出射光を受けて発光素子６１と受光素子６２とにより設定される検煙領域Ａの外側に集光する反射板４７とを備えている。 The front plate 41 and the back plate 42 are discs having the same outer diameter, and are connected to each other so as to be concentric.
Further, between the front plate 41 and the back plate 42, as shown in FIG. 11, a light emitting element holding portion 43 for holding the smoke sensing means 6 while covering the periphery except for the front of the light emitting element 61, and a smoke The light receiving element holding part 44 that holds the surroundings except for the front of the light receiving element 62 of the sensing means 6, the labyrinth part 45 that prevents intrusion of external light near the outer periphery of the dark box 4, and the light emitted from the light emitting element 61 Is prevented from directly entering the light receiving area of the light receiving element 62, and the light emitted from the light emitting element 61 is received and condensed outside the smoke detection area A set by the light emitting element 61 and the light receiving element 62. And a reflecting plate 47.

発光素子保持部４３は、発光素子６１を中心方向に向けて保持し、発光素子６１の左右と後方を覆う壁面部４３ａと前方で照射範囲を規制する絞り部４３ｂとを備えている。
上記壁面部４３ａは正面板４１に一体成形され、絞り部４３ｂは光軸を挟んで二分割され、一方が正面板４１に、他方が背面板４２に一体成形されている。
また、発光素子保持部４３に保持された発光素子６１は、そのリード線が背面板４２を貫通して暗箱４の背面側に位置する制御手段に接続されている。このリード線を暗箱４の外部に導く貫通穴の周囲には図示しない遮光壁が形成され、当該貫通穴からの外部光の侵入が防止されている。 The light emitting element holding portion 43 includes a wall surface portion 43a that holds the light emitting element 61 toward the center, covers the left and right sides and the rear of the light emitting element 61, and a diaphragm portion 43b that restricts the irradiation range at the front.
The wall surface portion 43a is integrally formed with the front plate 41, the diaphragm portion 43b is divided into two parts with the optical axis in between, one is integrally formed with the front plate 41 and the other is integrally formed with the back plate 42.
The light emitting element 61 held by the light emitting element holding portion 43 is connected to control means whose lead wire passes through the back plate 42 and is located on the back side of the dark box 4. A light shielding wall (not shown) is formed around the through hole that guides the lead wire to the outside of the dark box 4 to prevent intrusion of external light from the through hole.

受光素子保持部４４は、受光素子６２を中心方向に向けて保持し、受光素子６２の左右と後方を覆う壁面部４４ａと前方で受光範囲を規制する絞り部４４ｂとを備えている。
上記壁面部４４ａは正面板４１に一体成形され、絞り部４４ｂは背面板４２に一体成形されている。
また、受光素子保持部４４に保持された受光素子６２は、そのリード線が背面板４２を貫通して暗箱４の背面側に位置する制御手段に接続されている。このリード線を暗箱４の外部に導く貫通穴の周囲にも図示しない遮光壁が形成され、外部光の侵入は防止されている。 The light receiving element holding portion 44 includes a wall surface portion 44 a that holds the light receiving element 62 in the center direction and covers the left and right and the rear of the light receiving element 62 and a diaphragm portion 44 b that restricts the light receiving range at the front.
The wall surface portion 44 a is integrally formed with the front plate 41, and the throttle portion 44 b is integrally formed with the back plate 42.
Further, the light receiving element 62 held by the light receiving element holding portion 44 is connected to control means whose lead wire passes through the back plate 42 and is located on the back side of the dark box 4. A light-shielding wall (not shown) is also formed around the through hole that guides the lead wire to the outside of the dark box 4 to prevent intrusion of external light.

遮蔽板４６は、発光素子保持部４３と受光素子保持部４４の間に配置され、発光素子６１の照射範囲が受光素子６２側から離れるように制限されている。かかる遮光板４６は正面板４１に一体成形されている。
そして、発光素子保持部４３及び遮蔽板４６に規定される照射領域と受光素子保持部４４に規定される受光領域との重複する範囲が検煙領域Ａとなり、煙がこの検煙領域Ａ内に侵入すると、照射光が散乱されて生じる散乱光が受光素子６２に受光されて、煙の侵入を感知する。
かかる検煙領域Ａは、暗箱４のほぼ中央に設定される。 The shielding plate 46 is disposed between the light emitting element holding unit 43 and the light receiving element holding unit 44, and the irradiation range of the light emitting element 61 is limited to be separated from the light receiving element 62 side. The light shielding plate 46 is integrally formed with the front plate 41.
And the range which overlaps the irradiation area prescribed | regulated by the light emitting element holding | maintenance part 43 and the shielding board 46, and the light reception area prescribed | regulated by the light receiving element holding | maintenance part 44 becomes the smoke detection area A, and smoke is in this smoke detection area A. When the light enters, the scattered light generated by scattering the irradiation light is received by the light receiving element 62 to detect the intrusion of smoke.
Such smoke detection area A is set at the approximate center of the dark box 4.

反射板４７は、発光素子６１からの照射光を反射する凹面を備え、かかる反射板４７は正面板４１に一体成形されている。
反射板４７は、発光素子６１からの照射範囲全体の照射光を反射可能な大きさに設定され、暗箱４の外部となる仮想の集光点に集光するように凹面が形成されている。かかる仮想の集光点は、暗箱４の正面板４１よりも正面側遠方に設定されており、反射板４７をかかる形状とすることで、発光素子６１からの照射光の反射光を全て受光領域外に向かわせることができ、検煙時の散乱光以外の外乱光の影響を抑制し、Ｓ／Ｎ比を向上することができる。 The reflection plate 47 includes a concave surface that reflects the irradiation light from the light emitting element 61, and the reflection plate 47 is integrally formed with the front plate 41.
The reflecting plate 47 is set to a size capable of reflecting the irradiation light of the entire irradiation range from the light emitting element 61, and has a concave surface so that the light is condensed at a virtual condensing point outside the dark box 4. The virtual condensing point is set farther from the front side of the front plate 41 of the dark box 4, and the reflection plate 47 is formed in such a shape so that all the reflected light of the irradiation light from the light emitting element 61 is received in the light receiving region. It can be directed to the outside, the influence of disturbance light other than scattered light at the time of smoke detection can be suppressed, and the S / N ratio can be improved.

ラビリンス部４５は、断面形状が略Ｌ字状、略Ｚ字状等の屈曲形状となる複数の壁面と、発光素子保持部４３の壁面部４３ａ、受光素子保持部４４の壁面部４４ａと一体的に形成された壁面とからなり、これらのラビリンス部４５は、検煙領域Ａを取り囲むように配置される。そして、図１１に示す断面方向において、隙間を形成しながら互いにかみ合うように配置されることで、暗箱４の外周から検煙領域Ａへの外部光の侵入を防止している。なお、各ラビリンス部４５は互いに隙間をもって配置されるので、検煙領域Ａへの煙の誘導は容易に行うことができる。
なお、各ラビリンス部４５は、主に正面板４１に一体成形されている。 The labyrinth portion 45 is integrated with a plurality of wall surfaces having a bent shape such as a substantially L shape or a substantially Z shape in cross section, a wall surface portion 43a of the light emitting element holding portion 43, and a wall surface portion 44a of the light receiving element holding portion 44. These labyrinth portions 45 are arranged so as to surround the smoke detection area A. And it arrange | positions so that it may mutually mesh | interpose, forming a clearance gap in the cross-sectional direction shown in FIG. 11, and the penetration | invasion of the external light from the outer periphery of the dark box 4 to the smoke detection area | region A is prevented. In addition, since each labyrinth part 45 is mutually arrange | positioned with a clearance gap, the induction | guidance | derivation of the smoke to the smoke detection area | region A can be performed easily.
Each labyrinth portion 45 is mainly formed integrally with the front plate 41.

（カバー）
図１、図２に示すように、カバー５は、筐体２に着脱自在に設けられ、煙感知手段６、スピーカ１１０、スイッチ７等を覆うものである。カバー５は、円形の正面部５１と、正面部５１の周縁部から連なる側壁面を構成する円筒部５２と、正面部５１の中央部に設けられた略円筒状の凸状部５３とを有し、これらは白色の樹脂材料にて一体成形で作られている。
凸状部５３は、正面部５１に対して同心に配置されると共に当該正面部５１よりも小径な皿状の天板５３ａと、天板５３ａと正面部５１とを連結する四つのリブ５３ｂとを有している。
リブ５３ｂは、天板５３ａの周縁部において四本が均一間隔で設けられ、各リブ５３ｂ同士の間は広く開口している。図２に示すように、凸状部５３の内側には、煙感知手段６を格納する暗箱４が配置されるため、各リブ５３ｂの間を開口部５３ｃとすることで暗箱４内に煙を導きやすい構造となっている。
カバー５の正面部５１は、その中央部が、凸状部５３の天板５３ａとほぼ同じ大きさで開口し、暗箱４が遊挿状態で配置されている。 (cover)
As shown in FIGS. 1 and 2, the cover 5 is detachably provided on the housing 2 and covers the smoke sensing means 6, the speaker 110, the switch 7 and the like. The cover 5 includes a circular front part 51, a cylindrical part 52 that forms a side wall surface that extends from the peripheral part of the front part 51, and a substantially cylindrical convex part 53 provided at the center of the front part 51. These are made of a white resin material by integral molding.
The convex portion 53 is disposed concentrically with respect to the front portion 51 and has a dish-shaped top plate 53 a having a smaller diameter than the front portion 51, and four ribs 53 b that connect the top plate 53 a and the front portion 51. have.
Four ribs 53b are provided at regular intervals at the peripheral edge of the top plate 53a, and the ribs 53b are widely open. As shown in FIG. 2, since the dark box 4 for storing the smoke detecting means 6 is arranged inside the convex portion 53, smoke is generated in the dark box 4 by forming an opening 53c between each rib 53b. The structure is easy to guide.
The front portion 51 of the cover 5 has a central portion that is opened with substantially the same size as the top plate 53a of the convex portion 53, and the dark box 4 is arranged in a loosely inserted state.

図１３に示すように、カバー５の正面部５１の裏面には、カバー５を筐体２に取り付けた際に、筐体２の収容壁部２４に嵌合して筒体を形成する嵌合壁部５５が形成されている。嵌合壁部５５は、収容壁部２４と同じく、スピーカ１１０を取り囲むような略円形状に形成されている。そして、カバー５を筐体２に取り付けた際に、スピーカ１１０を取り囲んで筐体２側に延びる略円筒状の筒体が形成される。嵌合壁部５５によって囲まれたカバー５の正面部５１には、スピーカ１１０からの警報音を外部に出力する放音孔５５ａが形成されている。
また、嵌合壁部５５には、カバー５を筐体２に装着した時に、前述した二つの係止爪２５の先端部が嵌合する矩形の切り欠きが二カ所に設けられており、各係止爪２５が筒体である嵌合壁部５５の側壁の一部を構成するようになっている。 As shown in FIG. 13, when the cover 5 is attached to the housing 2, the back surface of the front portion 51 of the cover 5 is fitted into the housing wall portion 24 of the housing 2 to form a cylindrical body. A wall portion 55 is formed. The fitting wall portion 55 is formed in a substantially circular shape so as to surround the speaker 110, similarly to the housing wall portion 24. When the cover 5 is attached to the housing 2, a substantially cylindrical tube that surrounds the speaker 110 and extends toward the housing 2 is formed. A sound emitting hole 55a for outputting an alarm sound from the speaker 110 to the outside is formed in the front portion 51 of the cover 5 surrounded by the fitting wall portion 55.
Further, the fitting wall portion 55 is provided with two rectangular cutouts into which the tip portions of the two locking claws 25 are fitted when the cover 5 is attached to the housing 2. The locking claw 25 constitutes a part of the side wall of the fitting wall portion 55 that is a cylindrical body.

図２に示すように、カバー５の円筒部５２の下端部には、紐掛け部９４に係止された引き紐Ｔの他端部をカバー５の内部から外部に導く切り欠き状のガイド部５８が形成されている。
ここで、図１６に示すように、紐掛け部９４とガイド部５８との位置関係について説明すると、カバー５を筐体２に装着した状態において、紐掛け部９４は、筐体２の背面において周囲の平面部よりも後方外側に突出すると共に、ガイド部５８は、紐掛け部９４よりも後方に配置される。なお、紐掛け部９４の周囲の平面部は、前述した引き紐の収容部２７の底面であって、当該平面部は筐体２のベース１への非装着時において筐体２の後方から外部に開放されている。 As shown in FIG. 2, the lower end of the cylindrical portion 52 of the cover 5 is a notch-shaped guide portion that guides the other end portion of the drawstring T locked to the string hook portion 94 from the inside of the cover 5 to the outside. 58 is formed.
Here, as shown in FIG. 16, the positional relationship between the strap portion 94 and the guide portion 58 will be described. When the cover 5 is attached to the housing 2, the strap portion 94 is located on the back surface of the housing 2. The guide portion 58 is disposed rearward of the string hook portion 94 and protrudes rearward and outward from the surrounding flat portion. The flat surface portion around the strap portion 94 is the bottom surface of the pull string storage portion 27 described above, and the flat surface portion is externally attached from the rear of the housing 2 when the housing 2 is not attached to the base 1. It is open to.

（操作片）
図１、図２に示すように、カバー５の正面部５１の一部は切り欠かれており、この切り欠かれた部分には、カバー５と別個に構成され、カバー５から筐体２側に押し込み可能に支持された入力部９が設けられている。入力部９は、カバー５を筐体２に取り付けた状態で押圧操作をした際に、その先端が回路基板３に設けられたスイッチ７に接するように形成されている。そして、入力部９を押し込むことで、スイッチ７を入力することが可能となっている。なお、スイッチ７は警報音の作動確認の試験を行うためのものであり、入力操作されると、煙感知にかかわらず、警報音を鳴らすように回路基板３の回路が構成されている。 (Operation piece)
As shown in FIGS. 1 and 2, a part of the front portion 51 of the cover 5 is notched, and the notched portion is configured separately from the cover 5 and extends from the cover 5 to the housing 2 side. The input unit 9 is provided so as to be able to be pushed into the input unit 9. The input unit 9 is formed so that the tip of the input unit 9 is in contact with the switch 7 provided on the circuit board 3 when a pressing operation is performed with the cover 5 attached to the housing 2. The switch 7 can be input by pushing the input unit 9. Note that the switch 7 is for performing a test for confirming the operation of the alarm sound. When an input operation is performed, the circuit of the circuit board 3 is configured to sound an alarm sound regardless of smoke detection.

図１４〜図１８に示すように、入力部９は、カバー５の正面部５１の外周に沿う弧状に形成されている。入力部９の一端には、入力部９をカバー５の背面に取り付けるための取付部９１が形成されており、この取付部９１をカバー５の裏面側に取り付けることで、入力部９は、カバー５に取り付けられた一端部を支点として筐体２側に押し込み可能となる。
入力部９の背面側には、入力部９の正面から背面に向かう方向に沿って延びると共に、入力部９をカバー５に取り付けた際に、筐体２に向けて垂下するように形成された操作片９２が形成されている。なお、円弧状の壁面部の裏面が入力部９の押圧操作によりスイッチ７に接触する。 As shown in FIGS. 14 to 18, the input portion 9 is formed in an arc shape along the outer periphery of the front portion 51 of the cover 5. An attachment portion 91 for attaching the input portion 9 to the back surface of the cover 5 is formed at one end of the input portion 9. By attaching the attachment portion 91 to the back surface side of the cover 5, the input portion 9 5 can be pushed into the housing 2 with the one end attached to 5 as a fulcrum.
On the back side of the input unit 9, it extends along the direction from the front side to the back side of the input unit 9, and is formed so as to hang down toward the housing 2 when the input unit 9 is attached to the cover 5. An operation piece 92 is formed. The back surface of the arc-shaped wall surface portion contacts the switch 7 by the pressing operation of the input unit 9.

操作片９２は、入力部９の背面から延びる垂下部９３と、垂下部９３に連続するように形成されると共に垂下部９３の下端部から屈曲するように形成され、引き紐Ｔの一端部が繋がれる紐掛け部９４と、を備えている。
垂下部９３は、筐体２に入力部９を取り付けたカバー５を装着した際に、図１６に示すように、筐体２を貫通して筐体２の裏面側まで延びて、収容部２７内に配置される長さ、大きさに形成されている。従って、紐掛け部９４も筐体２の裏面における周囲の平面部に突出することとなる。 The operation piece 92 is formed so as to be continuous with the hanging portion 93 extending from the back surface of the input portion 9 and bent from the lower end portion of the hanging portion 93, and one end portion of the drawstring T is And a stringing portion 94 to be connected.
When the cover 5 having the input unit 9 attached to the housing 2 is attached to the drooping portion 93, as shown in FIG. 16, the drooping portion 93 extends through the housing 2 to the back surface side of the housing 2, and the housing portion 27. It is formed in the length and the size arranged inside. Accordingly, the strap portion 94 also protrudes from the surrounding flat portion on the back surface of the housing 2.

紐掛け部９４は、垂下部９３に対して直角に屈曲するように形成されている。図１４〜図１７に示すように、紐掛け部９４には、引き紐Ｔの一端部を係止するための溝部９４ａが、紐掛け部９４の面方向、すなわち、操作片９２の押圧操作方向に直交する方向に延びるように形成されている。また、この溝部９４ａは、当該溝部９４ａとガイド部５８との間に張った状態で掛け渡された引き紐Ｔにも直交する方向に沿っている。
溝部９４ａの開口付近は拡幅されており、引き紐Ｔが溝部９４ａ内に入り込みやすくなるように形成されている。溝部９４ａの奥側の端部は、拡幅されており、この部分で引き紐Ｔの結び目が係止される。また、溝部９４ａの奥側の端部が拡幅されていることで、引き紐Ｔを引っ張った際に溝部９４ａの長手方向にずれにくくなっている。
紐掛け部９４に繋がれる引き紐Ｔは、図１８に示すように、引っ張ることで操作片９２を引き紐Ｔの操作方向Ｐに動作させるものであり、引き紐Ｔを介してスイッチ７を押下することも可能となっている。
なお、図８や図１６などのように壁部２０の内壁部を垂下部９３に近接するように突設させてガイド部５８として構成し、かつガイド部５８を紐掛け部９４よりも後方に配置すれば、引き紐Ｔの一端部（結び目）からガイド部５８に掛かる部分は、押圧操作方向と殆ど同じ方向に引っ張られるので、この場合には、引き紐Ｔの結び目が紐掛け部９４に確実に係合されるとともに紐掛け部９４に加わる力は押圧操作方向に充分に伝達されるので、より確実にスイッチ７を押下する。
図９に示すように、引き紐Ｔは、束ねた際に収容壁部２４により形成される収容部２７に収容される長さ、太さの紐を用いることが好ましい。 The string hook portion 94 is formed to be bent at a right angle with respect to the hanging portion 93. As shown in FIGS. 14 to 17, a groove 94 a for locking one end portion of the drawstring T is formed on the string hook portion 94. The surface direction of the string hook portion 94, that is, the pressing operation direction of the operation piece 92. It is formed to extend in a direction orthogonal to the direction. Further, the groove portion 94 a is along a direction orthogonal to the drawstring T that is stretched between the groove portion 94 a and the guide portion 58.
The vicinity of the opening of the groove portion 94a is widened so that the drawstring T can easily enter the groove portion 94a. The back end of the groove 94a is widened, and the knot of the drawstring T is locked at this portion. Moreover, when the end part of the back | inner side of the groove part 94a is widened, when the drawstring T is pulled, it becomes difficult to shift | deviate to the longitudinal direction of the groove part 94a.
As shown in FIG. 18, the pull string T connected to the string hook portion 94 moves the operation piece 92 in the operation direction P of the pull string T by pulling, and presses the switch 7 via the pull string T. It is also possible to do.
As shown in FIG. 8 and FIG. 16, the inner wall portion of the wall portion 20 protrudes so as to be close to the hanging portion 93 and is configured as a guide portion 58, and the guide portion 58 is located behind the tie portion 94. If arranged, the portion of the pulling cord T that extends from the one end (knot) to the guide portion 58 is pulled in almost the same direction as the pressing operation direction. Since the force that is reliably engaged and applied to the string hook 94 is sufficiently transmitted in the pressing operation direction, the switch 7 is pressed down more reliably.
As shown in FIG. 9, it is preferable to use a string having a length and a thickness that are accommodated in the accommodating portion 27 formed by the accommodating wall portion 24 when the drawstring T is bundled.

（火災警報器の組み立てと取り付け）
火災警報器１００を天井や壁に設置する際には、ベース１をネジ等により天井や壁の所定位置に固定する。そして、火災警報器１００の本体を組み立てる際は、筐体２にカバー５を装着する。このとき、筐体２にはスピーカ１１０の収容壁部２４とカバー５の嵌合壁部５５とが嵌合するようにカバー５を筐体２に取り付ける。
次に、筐体２の裏面側から突出した操作片９２の紐掛け部９４に引き紐Ｔを通す。引き紐Ｔの一端部は、予め結び玉を形成する等して、引き紐Ｔが溝部９４ａから抜けないようにしておく。引き紐Ｔを紐掛け部９４に繋げた後、引き紐Ｔの他端部をカバー５のガイド部５８から引き出すように這わせておき、この状態で筐体２をベース１に取り付ける。
このような手順で火災警報器１００を天井や壁に設置すると、ガイド部５８から引き出された引き紐Ｔをユーザが引くことで操作片９２の押圧操作を行うことができる。
なお、引き紐Ｔを使用しない場合には、筐体２の収容部２７に引き紐Ｔを束ねて収容することができる。
火災による煙が発生すると、煙は、筐体２の開口部５３ｃから暗箱４のラビリンス部４５を介して検煙領域Ａ内に侵入する。すると、発光素子６１の照射光が散乱されて受光素子６２で受光され、当該受光素子６２の光感知から回路基板３は、スピーカ１１０により警報音を鳴らす。これにより、火災感知が行われる。 (Assembling and installing the fire alarm)
When the fire alarm 100 is installed on the ceiling or wall, the base 1 is fixed at a predetermined position on the ceiling or wall with screws or the like. Then, when the main body of the fire alarm 100 is assembled, the cover 5 is attached to the housing 2. At this time, the cover 5 is attached to the housing 2 so that the housing wall portion 24 of the speaker 110 and the fitting wall portion 55 of the cover 5 are fitted to the housing 2.
Next, the pull string T is passed through the string hook portion 94 of the operation piece 92 protruding from the back surface side of the housing 2. At one end of the drawstring T, a knotted ball is formed in advance so that the drawstring T does not come out of the groove 94a. After the drawstring T is connected to the string hooking portion 94, the other end portion of the drawstring T is turned so as to be pulled out from the guide portion 58 of the cover 5, and the housing 2 is attached to the base 1 in this state.
When the fire alarm device 100 is installed on the ceiling or wall in such a procedure, the user can perform the pressing operation of the operation piece 92 by pulling the drawstring T drawn from the guide portion 58 by the user.
When the drawstring T is not used, the drawstring T can be bundled and accommodated in the accommodating portion 27 of the housing 2.
When smoke due to fire is generated, the smoke enters the smoke detection area A from the opening 53 c of the housing 2 through the labyrinth portion 45 of the dark box 4. Then, the irradiation light of the light emitting element 61 is scattered and received by the light receiving element 62, and the circuit board 3 sounds an alarm sound through the speaker 110 from the light sensing of the light receiving element 62. Thereby, fire detection is performed.

（実施形態の作用・効果）
火災警報器１００において、カバー５を筐体２に装着すると、操作片９２に形成された紐掛け部９４は、筐体２の裏面においてその周囲の平面部から外側に突出する。そのため、紐掛け部９４は、筐体２の平面部から外側に露出した状態となり、引き紐Ｔを紐掛け部９４に結びつける際に、カバー５を筐体２から取り外す必要がない。これにより、操作片９２に引き紐Ｔを結びつける際、取り外しの際の手間を軽減することができる。また、引き紐Ｔの着脱毎にカバー５を筐体２から取り外す必要がなくなるので、組み立て工程の削減を図ることができる。
また、ガイド部５８は、カバー５を筐体２に装着した際に、紐掛け部９４よりも後方に配置される。そのため、紐掛け部９４に結ばれた引き紐の他端部を引っ張ると、紐掛け部９４がガイド部５８側に引っ張られることとなり、スイッチ７の押圧操作が行われるようになっている。
なお、ガイド部５８を紐掛け部９４に近接させ、かつ紐掛け部９４よりも後方に配置すれば、結び目（引き紐Ｔの一端部）からガイド部５８に掛かる部分の引き紐Ｔは、押圧操作方向と同方向に引かれるので、紐掛け部９４も押圧操作方向に引かれることとなり、より確実にスイッチ７の押圧操作が行われるようになる。 (Operation and effect of the embodiment)
In the fire alarm 100, when the cover 5 is attached to the housing 2, the string hook portion 94 formed on the operation piece 92 protrudes outward from the surrounding flat portion on the back surface of the housing 2. For this reason, the string hook portion 94 is exposed to the outside from the flat surface portion of the housing 2, and it is not necessary to remove the cover 5 from the housing 2 when the drawstring T is tied to the string hook portion 94. Thereby, when connecting the drawstring T to the operation piece 92, the effort at the time of removal can be reduced. In addition, since it is not necessary to remove the cover 5 from the housing 2 every time the drawstring T is attached or detached, the assembly process can be reduced.
Further, the guide portion 58 is disposed behind the string hook portion 94 when the cover 5 is attached to the housing 2. Therefore, when the other end portion of the pull string tied to the string hook portion 94 is pulled, the string hook portion 94 is pulled to the guide portion 58 side, and the pressing operation of the switch 7 is performed.
In addition, if the guide part 58 is brought close to the string hooking part 94 and disposed behind the string hooking part 94, the pulling string T in the part that hooks from the knot (one end part of the pulling string T) to the guide part 58 is pressed. Since it is pulled in the same direction as the operation direction, the string hooking portion 94 is also pulled in the pressing operation direction, so that the pressing operation of the switch 7 is more reliably performed.

また、紐掛け部９４には、切り欠き状の溝部９４ａが形成され、その溝部９４ａは操作片９２の押圧操作方向に直交する方向であって紐掛け部９４とガイド部５８の間を渡る引き紐Ｔに直交する方向に延びている。そのため、引き紐Ｔを紐掛け部９４に結びつけて引き紐Ｔを引いた際に、操作片９２にかかる力のうち、操作片９２の押圧操作方向に直交する方向の成分の力はかからない。これにより、引き紐Ｔが紐掛け部９４の溝部９４ａにおいて操作片９２の押圧操作方向に直交する方向にずれることがない。
また、引き紐Ｔを引いて操作片９２の操作を行った後に引き紐Ｔを手放した場合において、引き紐Ｔの弾性力により引き紐Ｔが引く前の位置に戻ろうとしても、引き紐Ｔが戻ろうとする方向と紐掛け部９４の溝部９４ａの延びる方向が直交しているので、引き紐Ｔは紐掛け部９４から外れない。
よって、引き紐Ｔが紐掛け部９４から外れることを防止できる。 In addition, a notch-shaped groove portion 94 a is formed in the string hook portion 94, and the groove portion 94 a is a direction that is orthogonal to the pressing operation direction of the operation piece 92 and extends between the string hook portion 94 and the guide portion 58. It extends in a direction perpendicular to the string T. Therefore, when the pull string T is tied to the string hook portion 94 and the pull string T is pulled, the component force in the direction orthogonal to the pressing operation direction of the operation piece 92 is not applied. Thereby, the drawstring T does not shift in the direction orthogonal to the pressing operation direction of the operation piece 92 in the groove portion 94a of the string hook portion 94.
In addition, when the drawstring T is released after the drawstring T is pulled and the operation piece 92 is operated, the drawstring T may be returned to the position before the drawstring T is pulled by the elastic force of the drawstring T. Since the direction in which the thread is about to return and the direction in which the groove 94 a of the string hooking portion 94 extends are orthogonal to each other, the pull string T does not come off the string hooking portion 94.
Therefore, it is possible to prevent the drawstring T from being detached from the string hook portion 94.

また、筐体２の裏側に収容部２７を設けることにより、引き紐Ｔを収容部２７に収容することができる。
このため、引き紐Ｔを紛失してしまうことがない。
また、収容部２７は筐体２の裏側に設けられていることから、収容された引き紐Ｔは外部から視認することができない。そのため、引き紐Ｔが火災警報器１００からはみ出すことにより室内の景観を損なうこともない。 In addition, the drawstring T can be accommodated in the accommodating portion 27 by providing the accommodating portion 27 on the back side of the housing 2.
For this reason, the drawstring T is not lost.
Moreover, since the accommodating part 27 is provided in the back side of the housing | casing 2, the accommodated drawstring T cannot be visually recognized from the outside. Therefore, the indoor landscape is not impaired by the drawstring T protruding from the fire alarm 100.

また、カバー５を筐体２に装着した際に、紐掛け部９４は、収容部２７内に配置される。これにより、引き紐Ｔ全体を収容部２７に収容することができ、引き紐Ｔが収容部２７外の領域で他の部品等に絡まることがない。また、収容部２７から取り出した引き紐Ｔを取り付ける場所がすぐに分かると共にすぐ近くに位置するため円滑且つ容易に引き紐Ｔの取付作業を行うことができる。 Further, when the cover 5 is attached to the housing 2, the string hook portion 94 is disposed in the housing portion 27. As a result, the entire drawstring T can be accommodated in the accommodating portion 27, and the drawstring T is not entangled with other components in the region outside the accommodating portion 27. Moreover, since the place where the drawstring T taken out from the accommodating portion 27 is attached is immediately known and is located in the immediate vicinity, the drawstring T can be attached smoothly and easily.

また、収容部２７に収容された引き紐Ｔと紐掛け部９４とを隔離する隔離壁２９が設けられていることから、引き紐Ｔが紐掛け部９４に引っ掛かることがない。これにより、収容部２７内の引き紐Ｔが絡まるのを防止することができると共に操作片の操作不良を効果的に防止することが可能となる。 In addition, since the isolation wall 29 that separates the drawstring T accommodated in the accommodation portion 27 and the stringing portion 94 is provided, the drawstring T is not caught on the stringing portion 94. Thereby, it is possible to prevent the drawstring T in the accommodating portion 27 from being entangled and to effectively prevent an operation failure of the operation piece.

また、スピーカ１１０は収容壁部２４に囲まれて形成される凹部２３に収容される。このとき、係止爪２５は、凹部２３からのスピーカ１１０の離脱を防止するようにスピーカ１１０を係止する。これにより、スピーカ１１０は筐体２に形成された係止爪２５で凹部２３への収容が可能となるので、従来のように、ネジ等を用いて筐体２に固定する必要がなく、スピーカ１１０の筐体２への着脱を容易にすることができ、さらには、部品点数を軽減できる。 The speaker 110 is housed in a recess 23 formed surrounded by the housing wall 24. At this time, the locking claw 25 locks the speaker 110 so as to prevent the speaker 110 from being detached from the recess 23. As a result, the speaker 110 can be accommodated in the recess 23 by the locking claw 25 formed in the housing 2, so that it is not necessary to fix the speaker 110 to the housing 2 using screws or the like as in the prior art. 110 can be easily attached to and detached from the housing 2, and the number of parts can be reduced.

また、カバー５を筐体２に装着するとカバー５の嵌合壁部５５は筐体２の収容壁部２４に嵌合してスピーカ１１０の周囲を包み込む筒体を形成する。ここで、係止爪２５は、筒体を構成しているので、筒体と係止爪２５を別個に設ける場合に比べて省スペース化を図ることができる。
また、嵌合壁部５５と収容壁部２４との嵌め込みは、カバー５を筐体２に装着する際のガイドとすることもできるので、カバー５の筐体２への装着作業を容易にすることができる。
また、筒体は、スピーカ１１０の周囲を筒状に囲む壁部となるので、スピーカ１１０から発せられた音がスピーカ１１０の周囲に散乱することを抑制して大部分が一方向に伝達され、警報効果を向上させることができる。 Further, when the cover 5 is attached to the housing 2, the fitting wall portion 55 of the cover 5 is fitted into the housing wall portion 24 of the housing 2 to form a cylindrical body that wraps around the speaker 110. Here, since the latching claw 25 comprises the cylinder, space saving can be achieved compared with the case where a cylinder and the latching claw 25 are provided separately.
Further, the fitting between the fitting wall portion 55 and the accommodating wall portion 24 can be used as a guide when the cover 5 is mounted on the housing 2, so that the mounting work of the cover 5 on the housing 2 is facilitated. be able to.
Further, since the cylindrical body is a wall portion that surrounds the speaker 110 in a cylindrical shape, most of the sound transmitted from the speaker 110 is transmitted in one direction while suppressing the sound emitted from the speaker 110 from being scattered around the speaker 110, The alarm effect can be improved.

また、収容壁部２４と係止爪２５との間にスリット部２６が形成されており、このスリット部２６からスピーカ１１０の導線１１１を収容領域から外側に案内することができる。これにより、スピーカ１１０の導線１１１が他の場所に行かないようにスリット部２６で押さえることができるので、スピーカ１１０の導線１１１の配線を容易に行うことができる。
また、係止爪２５の撓みを許容するためのスリット部２６が上記スピーカ１１０の導線１１１のガイドとしても機能するので別途導線１１１のガイドを設ける必要がなく、火災警報器１００の生産性の向上を図ることが可能となる。 Further, a slit portion 26 is formed between the storage wall portion 24 and the locking claw 25, and the lead wire 111 of the speaker 110 can be guided from the storage region to the outside through the slit portion 26. Thereby, since it can hold | suppress with the slit part 26 so that the conducting wire 111 of the speaker 110 may not go to another place, wiring of the conducting wire 111 of the speaker 110 can be performed easily.
Further, since the slit portion 26 for allowing the locking claw 25 to bend also functions as a guide for the conducting wire 111 of the speaker 110, it is not necessary to provide a separate guide for the conducting wire 111, and the productivity of the fire alarm 100 is improved. Can be achieved.

（その他）
なお、本発明は上記実施形態に限られるものではない。例えば、図１９に示すように、紐掛け部９８に形成される溝部９８ａを途中で引き紐を引っ張る方向に屈曲させる略Ｌ字状に形成してもよい。このような形状としても、引き紐を引っ張る際には、引き紐が溝部９８ａから外れる方向に動くことを規制されるので、紐掛け部９８からの引き紐の離脱を防止することができる。
また、火災警報器１００では、火災感知手段として煙感知手段６を搭載しているが、熱感知手段を搭載しても良い。
また、スイッチ７については、特に機能を警報のオンオフの入力に限定するものではなく、煙感知手段６の制御手段に対して必要ないかなる操作入力を行うものであっても良い。 (Other)
The present invention is not limited to the above embodiment. For example, as shown in FIG. 19, the groove portion 98 a formed in the string hook portion 98 may be formed in a substantially L shape that bends in the direction of pulling the pull string halfway. Even in such a shape, when the pull string is pulled, the pull string is restricted from moving in a direction away from the groove portion 98a, so that the pull string can be prevented from being detached from the string hook portion 98.
Moreover, in the fire alarm 100, although the smoke detection means 6 is mounted as a fire detection means, you may mount a heat detection means.
Further, the switch 7 is not particularly limited in function to an alarm on / off input, and may be any operation input necessary for the control means of the smoke sensing means 6.

２筐体
５カバー
６煙感知手段
７スイッチ
２３凹部（収容領域）
２４収容壁部
２５係止爪
２６スリット部
２７収容部
２９隔離壁
５５嵌合壁部
５５ａ放音孔
５８ガイド部
９２操作片
９４紐掛け部
９４ａ溝部
１００火災警報器
１１０スピーカ（報知手段）
１１１導線
Ｔ引き紐 2 Housing 5 Cover 6 Smoke detection means 7 Switch 23 Recess (accommodating area)
24 accommodating wall 25 locking claw 26 slit 27 accommodating part 29 separating wall 55 fitting wall 55a sound emitting hole 58 guide part 92 operation piece 94 stringing part 94a groove part 100 fire alarm 110 speaker (notification means)
111 Conductor T Drawstring

Claims

A housing provided with a fire detection means for detecting a fire and a notification means for notifying that the fire detection means has detected a fire;
A cover detachably provided on the housing and covering the notification means,
The notification means has a speaker for notifying the detection of fire by the fire detection means by sound,
A housing wall portion formed so as to surround the outer periphery of the speaker and the speaker locked to the housing so as to prevent the speaker from being detached from a housing area formed by being surrounded by the housing wall portion. A fire alarm characterized in that a locking claw is integrally provided.

The cover has a sound emitting hole and a cylindrical body that guides a notification sound to the sound emitting hole facing the speaker when the cover is attached to the housing;
The fire alarm according to claim 1, wherein the latching claw extends to the cylindrical body side and constitutes a part of a side wall of the cylindrical body.

The speaker is connected to the control means of the notification means via a conductor.
A slit portion that allows the locking claw to bend is formed between the storage wall portion and the locking claw, and the conductive wire is guided to the outside of the storage area from the slit portion. The fire alarm according to claim 2.