JPH0594917U - Emergency alarm push button switch - Google Patents
Emergency alarm push button switchInfo
- Publication number
- JPH0594917U JPH0594917U JP204392U JP204392U JPH0594917U JP H0594917 U JPH0594917 U JP H0594917U JP 204392 U JP204392 U JP 204392U JP 204392 U JP204392 U JP 204392U JP H0594917 U JPH0594917 U JP H0594917U
- Authority
- JP
- Japan
- Prior art keywords
- push button
- housing
- pressing
- emergency alarm
- connecting bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
(57)【要約】
【目的】 繰り返し使用や雨等に対する押圧荷重の変化
が少ない非常警報用押釦スイッチを提供する。
【構成】 ハウジング1外部に押釦2の押圧部2aを露
出し、押釦2の支柱部2bをハウジング1内部において
一対の板状ばね5a,5aにて押圧挟持すると共に、連
結バー3の中間部を軸支承してその先端部3bを前記支
柱部2bの側面に係合し、且つ該連結バー3の終端部3
cを前記ハウジング1表面から上部が突出し得る復帰釦
4の下部に連結した。
(57) [Abstract] [Purpose] To provide a push button switch for an emergency alarm, in which a change in the pressing load against repeated use or rain is small. [Structure] The pressing portion 2a of the push button 2 is exposed to the outside of the housing 1, and the column portion 2b of the push button 2 is pressed and sandwiched inside the housing 1 by a pair of plate-shaped springs 5a and 5a. The tip end 3b of the connecting bar 3 is supported by a shaft, and the end portion 3b of the connecting bar 3 is engaged with the side surface of the pillar portion 2b.
The c is connected to the lower part of the return button 4 whose upper part can project from the surface of the housing 1.
Description
【0001】[0001]
本考案は、消防機器等に使用される非常警報用押釦スイッチの構造に関するも のある。 The present invention also relates to the structure of an emergency alarm push button switch used in fire fighting equipment and the like.
【0002】[0002]
図4は、非常警報用押釦スイッチの従来例を示す図である。 FIG. 4 is a diagram showing a conventional example of an emergency alarm push button switch.
【0003】 従来の非常警報用押釦スイッチ20は、図4に示すように、ハウジング21と 、押圧カバー22a及び支柱部22bとから成る押釦22と、該押釦22のON 状態を自己保持させる自己保持レバー23と、可動接片24aと固定接片24b とから成る電気接片24とを有して構成されている。As shown in FIG. 4, a conventional emergency alarm push button switch 20 includes a housing 21, a push button 22 composed of a push cover 22a and a support portion 22b, and a self-holding for holding the ON state of the push button 22 by itself. It has a lever 23 and an electric contact piece 24 composed of a movable contact piece 24a and a fixed contact piece 24b.
【0004】 前記押釦22は、前記ハウジング21内において巻きばね22cにより支えら れている。又、前記自己保持レバー23は、該押圧カバー22aに設けられた係 合部22dに係合し得る突起部23aを有しており、前記ハウジング21の内側 面において巻きばね23cにより支えられている。The push button 22 is supported in the housing 21 by a coil spring 22c. Further, the self-holding lever 23 has a protrusion 23a capable of engaging with an engaging portion 22d provided on the pressing cover 22a, and is supported by a coil spring 23c on the inner surface of the housing 21. ..
【0005】 図4は非常警報用押釦スイッチ20のOFF状態を示す図であり、前記可動接 片24aと前記固定接片24bとは互いにその接点が離れている状態である。前 記自己保持レバー23の突起部23aは、その上面が傾斜面23dになっており 、該傾斜面23dには、前記押圧カバー22aの係合部22dが当接している。 図4のOFF状態から前記押圧カバー22aを押すと、その係合部22dに押圧 されて前記自己保持レバー23が図中左方に移動し、図5に示す状態になる。即 ち、前記支柱部22bが図中下方に移動し、その先端が電気接片24の可動接片 24aを押動して固定接片24bに接触させるので、非常警報用押釦スイッチ2 0はON状態となる。同時に、該係合部22dは突起部23aを乗り越えてその 下方に位置するので、前記自己保持レバー23はその巻きばね23cの弾性力に より元の状態に復帰する。押釦22への押圧力を除去すると、該押釦22は巻き ばね22cの弾性力によりOFF状態に復帰しようとするが、前記押圧カバー2 2aの係止部22dが前記自己保持レバー23の突起部23aの下側面に係合さ れているから、図5に示すように、非常警報用押釦スイッチ20はON状態を保 持することになる。図5のON状態において、前記自己保持レバー23を手動で 図中左方に移動させると、前記押圧カバー22aの係合部22dと該自己保持レ バー23の突起部23aとの係合状態が解除され、前記押釦22はその巻きばね 22cの弾性力によりOFF状態に復帰する。FIG. 4 is a diagram showing the OFF state of the emergency alarm push button switch 20, in which the movable contact piece 24a and the fixed contact piece 24b are separated from each other. The upper surface of the protrusion 23a of the self-holding lever 23 is an inclined surface 23d, and the engaging portion 22d of the pressing cover 22a is in contact with the inclined surface 23d. When the pressing cover 22a is pushed from the OFF state shown in FIG. 4, the engaging portion 22d pushes the self-holding lever 23 to the left in the figure, and the state shown in FIG. 5 is obtained. Immediately, the column portion 22b moves downward in the figure, and its tip pushes the movable contact piece 24a of the electric contact piece 24 to bring it into contact with the fixed contact piece 24b, so that the emergency alarm push button switch 20 is turned on. It becomes a state. At the same time, since the engaging portion 22d rides over the protrusion 23a and is located therebelow, the self-holding lever 23 returns to its original state by the elastic force of the coil spring 23c. When the pressing force applied to the push button 22 is removed, the push button 22 tries to return to the OFF state due to the elastic force of the coil spring 22c, but the locking portion 22d of the pressure cover 22a has the protrusion portion 23a of the self-holding lever 23. Since the lower side surface is engaged, the emergency alarm push button switch 20 maintains the ON state, as shown in FIG. In the ON state of FIG. 5, when the self-holding lever 23 is manually moved to the left in the figure, the engagement state of the engaging portion 22d of the pressing cover 22a and the protruding portion 23a of the self-holding lever 23 is changed. When the push button 22 is released, the push button 22 returns to the OFF state by the elastic force of the coil spring 22c.
【0006】[0006]
該非常警報用押釦スイッチ20を消防機器に使用する場合、その押釦22を押 圧動作させるのに必要な押圧荷重(以下、「動作押圧荷重」と言う)の規定値は 、2kgを越え且つ8kg以下が適切とされている。 When the emergency warning push button switch 20 is used for fire fighting equipment, the prescribed value of the pressing load (hereinafter, referred to as "operating pressing load") required to press the push button 22 exceeds 2 kg and 8 kg. The following are considered appropriate.
【0007】 然しながら従来の構成においては、前記動作押圧荷重は、前記自己保持レバー 23の突起部23aにおける傾斜面23dの摩擦抵抗にも依存するので、該傾斜 面23dに雨等の水滴が付着したり、繰り返し使用によって該傾斜面23dが磨 耗すると、傾斜面23dにおける摩擦抵抗値が低下し、該押釦22の押圧荷重が その適切値より小さくなってしまうという問題があった。However, in the conventional configuration, since the operation pressing load also depends on the frictional resistance of the inclined surface 23d of the protrusion 23a of the self-holding lever 23, water drops such as rain adhere to the inclined surface 23d. Alternatively, when the inclined surface 23d is worn by repeated use, the frictional resistance value on the inclined surface 23d decreases, and the pressing load of the push button 22 becomes smaller than the appropriate value.
【0008】 本考案は、上記問題を鑑みて成されたものであり、その目的とするところは、 繰り返し使用や雨等に対して押圧荷重の変化が少ない非常警報用押釦スイッチを 提供することにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide a push button switch for an emergency alarm in which the change in the pressing load is small with repeated use or rain. is there.
【0009】[0009]
上記課題を解決するため本考案は、ハウジング外部に押圧部を露出し且つ支柱 部の一部をハウジンク内部に挿入した押釦の軸方向への押圧動作により、電気接 片を開閉する非常警報用押釦スイッチにおいて、前記押釦の押圧時にその押圧方 向とは逆方向に抵抗力が作用するよう、該押釦の支柱部を前記ハウジング内部に おいて一対の板状ばねにて押圧挟持すると共に、中間部が支承された連結バーの 先端部を前記支柱部の側面に係合し、且つ該連結バーの終端部を前記ハウジング 表面から上部が突出し得る復帰釦の下部に連結したことを特徴とするものである 。 In order to solve the above problems, the present invention has a push button for an emergency alarm that opens and closes an electric contact by the push operation in the axial direction of a push button that exposes the push portion outside the housing and inserts a part of the support portion inside the housing. In the switch, the pillar of the push button is pressed and sandwiched by a pair of leaf springs inside the housing so that a resistance force acts in a direction opposite to the pushing direction when the push button is pressed. Is engaged with the side surface of the column, and the terminal end of the connecting bar is connected to the lower portion of the return button whose upper portion can project from the surface of the housing. is there .
【0010】[0010]
本考案の非常警報用押釦スイッチは、押釦が押し込まれていない状態(以下、 「OFF状態」と言う)から、或る押圧荷重以上で該押釦を押圧すると突然、該 押釦が押圧方向に変位し、押釦が完全に押し込まれた状態(以下、「ON状態」 と言う)になり電気接片が閉路する。押圧に必要な押圧荷重は板状ばねにより得 ている。該板状ばねは、変形しながら該押釦の変位に追従する。又、該押釦の支 柱部には、中間部が支承された連結バーの先端部が係合しており、該連結バーの 終端部には復帰釦が連結されている。該復帰釦は、前記連結バーを介して前記押 釦と連動するようになっており、前記押釦のON状態において、その一部が前記 ハウジング表面から突出するようになっている。該ON状態において該復帰釦を 押圧すると、前記押釦がOFF状態に復帰するようになっている。 The emergency alarm push button switch of the present invention, when the push button is not pushed (hereinafter referred to as "OFF state"), when the push button is pushed with a certain load or more, the push button is suddenly displaced in the pushing direction. , The push button is completely depressed (hereinafter referred to as "ON state"), and the electric contact piece is closed. The pressing load necessary for pressing is obtained by a leaf spring. The leaf spring follows the displacement of the push button while deforming. Further, the support bar of the push button is engaged with the tip end of the connecting bar having the intermediate part supported, and the return button is connected to the terminal end of the connecting bar. The return button interlocks with the push button via the connecting bar, and when the push button is in an ON state, a part of the return button projects from the surface of the housing. When the return button is pressed in the ON state, the push button is returned to the OFF state.
【0011】[0011]
以下に本考案を、その実施例を示す図面を用いて説明する。 The present invention will be described below with reference to the drawings showing its embodiments.
【0012】 図1は、本考案に係る実施例を示す断面図であり、図2は、前記図1のA−A 下面図である。FIG. 1 is a sectional view showing an embodiment according to the present invention, and FIG. 2 is a bottom view taken along the line AA of FIG.
【0013】 図1及び図2において、2は、押圧部2aと支柱部2bとを有する押釦である 。前記押圧部2aは、手動で押圧されるべき部分であり、前記支柱部2bは、電 気接片6の可動接片6aを押動して固定接片6bに接触させて電気接片6を閉路 させる。前記押圧部2aはハウジング1外部に露出しており、前記支柱部2bの 一部はハウジング1内部に挿入され、該支柱部2bの先端方向には、電気接片6 が配されている。In FIGS. 1 and 2, reference numeral 2 is a push button having a pressing portion 2 a and a support portion 2 b. The pressing portion 2a is a portion to be manually pressed, and the supporting column portion 2b pushes the movable contact piece 6a of the electric contact piece 6 to bring it into contact with the fixed contact piece 6b so that the electric contact piece 6 is held. Make a circuit. The pressing portion 2a is exposed to the outside of the housing 1, a part of the supporting pillar portion 2b is inserted into the housing 1, and an electric contact piece 6 is arranged in the tip end direction of the supporting pillar portion 2b.
【0014】 3は、前記押釦2と復帰釦4とを連動させる連結バーである。該連結バー3は 、その中間点に支点3aを有し、該支点3aは回動可能に軸支されている。該連 結バー3の先端部3bは、前記押釦2の支柱部2bに設けられた溝部に回動可能 に挿入され、該連結バー3の終端部3cは、ハウジング1の外部に突出し得る復 帰釦4にヒンジ作用を有するように連結されている。Reference numeral 3 denotes a connecting bar that links the push button 2 and the return button 4. The connecting bar 3 has a fulcrum 3a at its intermediate point, and the fulcrum 3a is pivotally supported. A tip portion 3b of the connecting bar 3 is rotatably inserted into a groove portion provided in the column portion 2b of the push button 2, and a terminal end portion 3c of the connecting bar 3 can be projected outside the housing 1. It is connected to the button 4 so as to have a hinge action.
【0015】 5は、前記押釦2を自己保持させる為の一対の板状ばね5a,5aを一体に有 するプレートである。該板状ばね5aは、その中間に湾曲部5bを有しており、 該湾曲部5bの湾曲によってばね作用を作り出す。前記プレート5自体は、ハウ ジング1内に固定されており、前記板状ばね5a,5aは、その先端部5c,5 c夫々が前記押釦2に設けられた溝部夫々に回動可能に挿入されている。前記押 釦2の支柱部2bは、2本の板状ばね5a,5aによって両側面から挟持された 状態となっている。Reference numeral 5 is a plate integrally having a pair of plate-shaped springs 5a, 5a for holding the push button 2 by itself. The plate-shaped spring 5a has a curved portion 5b in the middle thereof, and a spring action is created by the bending of the curved portion 5b. The plate 5 itself is fixed in the housing 1, and the tip ends 5c and 5c of the plate-shaped springs 5a and 5a are rotatably inserted into the groove portions provided in the push button 2, respectively. ing. The column 2b of the push button 2 is in a state of being sandwiched by the two plate springs 5a, 5a from both side surfaces.
【0016】 以下、前記押釦2の押圧部2aを手動押圧する方向(図中下方向)を「押圧方 向」と言い、該押圧方向とは逆の方向(図中上方向)を「逆押圧方向」と言う。Hereinafter, the direction in which the pressing portion 2a of the push button 2 is manually pressed (downward in the drawing) is referred to as “pressing direction”, and the direction opposite to the pressing direction (upward in the drawing) is “reverse pressing”. Say "direction".
【0017】 図1は、OFF状態を表す図であり、前記板状ばね5a,5aは、前記押釦2 を逆押圧方向に突き上げるように、前記押釦2の支柱部2bを支持している。又 、電気接片6の可動接片6aと固定接片6bは、消防機器の内部回路に接続され ており、OFF状態においては、前記可動接片6aと前記固定接片6bとは互い にその接点が離れている状態である。FIG. 1 is a view showing an OFF state, and the plate-shaped springs 5a, 5a support the column portion 2b of the push button 2 so as to push up the push button 2 in the reverse pressing direction. Further, the movable contact piece 6a and the fixed contact piece 6b of the electric contact piece 6 are connected to the internal circuit of the fire fighting equipment, and in the OFF state, the movable contact piece 6a and the fixed contact piece 6b are connected to each other. The contacts are separated.
【0018】 図1の前記OFF状態から、押釦2の押圧部2aを押圧方向に押圧すると、前 記板状ばね5a,5aのばね力によって逆押圧方向に抵抗力が作用する。該抵抗 力に抗して更に押釦2の押圧部2aを押圧していくと、或る押圧荷重で押圧した ときに押圧力が該板状ばね5a,5aの抵抗力を上回り、突然押釦2が押圧方向 に変位するようになる。該押釦2の変位に伴い、板状ばね5a,5aの先端部は 該押釦2の変位に追従していく。そして、押釦2が完全に押圧方向に変位しきっ た状態においては、図3に示すように、前記板状ばね5a,5aは、前記押釦2 を押圧方向に突き下げるように支持し、該押釦2を図3の位置に保持させる。同 時に、前記支柱部2bの先端が前記可動接片6aを押動して固定接片6bに接触 させて電気接片6をON状態にする。又、前記押釦2の移動に連動して、復帰釦 4がハウジング1表面に突出する。When the pressing portion 2a of the push button 2 is pressed in the pressing direction from the OFF state of FIG. 1, a resistance force acts in the reverse pressing direction by the spring force of the plate springs 5a, 5a. When the pressing portion 2a of the push button 2 is further pressed against the resistance force, the pressing force exceeds the resistance force of the leaf springs 5a, 5a when pressed by a certain pressing load, and the push button 2 suddenly moves. It will be displaced in the pressing direction. With the displacement of the push button 2, the tip ends of the leaf springs 5a, 5a follow the displacement of the push button 2. When the push button 2 is completely displaced in the pressing direction, as shown in FIG. 3, the plate springs 5a, 5a support the push button 2 so as to push it down in the pressing direction. Is held in the position of FIG. At the same time, the tip of the column 2b pushes the movable contact piece 6a to bring it into contact with the fixed contact piece 6b to turn on the electric contact piece 6. Further, the return button 4 projects on the surface of the housing 1 in conjunction with the movement of the push button 2.
【0019】 又、図3のON状態において、ハウジング1から突出している前記復帰釦4を 押圧すると、前記押釦2が逆押圧方向に変位し、図1のOFF状態に戻る。この ときの前記復帰釦4の押圧荷重は、前記連結バー3の支点3aの位置を調節する ことにより小さくすることが可能で、軽い力で押圧しても簡単に前記押釦2を逆 押圧方向に変位させることが出来る。Further, in the ON state of FIG. 3, when the return button 4 protruding from the housing 1 is pressed, the push button 2 is displaced in the reverse pressing direction and returns to the OFF state of FIG. The pressing load of the return button 4 at this time can be reduced by adjusting the position of the fulcrum 3a of the connecting bar 3, so that the pressing button 2 can be easily pushed in the reverse pressing direction even if pressed with a light force. It can be displaced.
【0020】[0020]
以上のように本考案の非常警報用押釦スイッチは、押釦の押圧荷重を板状ばね のばね力によって得ているため、繰り返し使用や水滴等によってその動作押圧荷 重が変化するということが無い。 As described above, in the emergency alarm push button switch of the present invention, since the pressing load of the push button is obtained by the spring force of the plate spring, the operation pressing load does not change due to repeated use or water drops.
【提出日】平成4年1月28日[Submission date] January 28, 1992
【手続補正1】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】0016[Correction target item name] 0016
【補正方法】変更[Correction method] Change
【0016】 以下、前記押釦2の押圧部2aを手動押圧する方向を「押圧方向 」と言い、該押圧方向とは逆の方向を「逆押圧方向」と言う。[0016] In the following, it said means a person direction to manually presses the pressing portion 2a of the push button 2 and "pressing direction" refers to a direction towards the opposite of the "reverse pressing direction" is the pressing pressure direction.
【提出日】平成4年9月10日[Submission date] September 10, 1992
【手続補正1】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】0001[Correction target item name] 0001
【補正方法】変更[Correction method] Change
【0001】 本考案は、消防機器等に使用される非常警報用押釦スイッチの構 造に関するものである。[0001] The present invention relates to the structure of the emergency alarm for a push button switch which is used in fire-fighting equipment and the like.
【図1】第1の本考案実施例のOFF状態を示す断面
図。FIG. 1 is a sectional view showing an OFF state of a first embodiment of the present invention.
【図2】第1の本考案実施例を示す図1のA−A下面
図。FIG. 2 is a bottom view of AA of FIG. 1 showing a first embodiment of the present invention.
【図3】第1の本考案実施例のON状態を示す断面図。FIG. 3 is a sectional view showing the ON state of the first embodiment of the present invention.
【図4】従来例のOFF状態を示す断面図。FIG. 4 is a cross-sectional view showing an OFF state of a conventional example.
【図5】従来例のON状態を示す断面図。FIG. 5 is a sectional view showing an ON state of a conventional example.
1 ハウジング 2 押釦 2a 押圧部 2b 支柱部 3 連結バー 3a 支点 4 復帰釦 5a 板状ばね 1 Housing 2 Push Button 2a Pushing Part 2b Strut Part 3 Connecting Bar 3a Support Point 4 Return Button 5a Leaf Spring
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【手続補正書】[Procedure amendment]
【提出日】平成4年1月28日[Submission date] January 28, 1992
【手続補正2】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図1[Name of item to be corrected] Figure 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図1】 [Figure 1]
【手続補正3】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図3[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図3】 ─────────────────────────────────────────────────────
[Figure 3] ─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成4年9月10日[Submission date] September 10, 1992
【手続補正2】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図4[Name of item to be corrected] Fig. 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図4】 [Figure 4]
【手続補正3】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図5[Name of item to be corrected] Figure 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図5】 [Figure 5]
Claims (1)
柱部の一部をハウジンク内部に挿入した押釦の軸方向へ
の押圧動作により、電気接片を開閉する非常警報用押釦
スイッチにおいて、 前記押釦の押圧時にその押圧方向とは逆方向に抵抗力が
作用するよう、該押釦の支柱部を前記ハウジング内部に
おいて一対の板状ばねにて押圧挟持すると共に、 中間部が支承された連結バーの先端部を前記支柱部の側
面に係合し、且つ該連結バーの終端部を前記ハウジング
表面から上部が突出し得る復帰釦の下部に連結したこと
を特徴とする非常警報用押釦スイッチ。1. A push button switch for an emergency alarm, which opens and closes an electric contact piece by an axial pushing operation of a push button in which a pushing portion is exposed outside the housing and a part of a supporting column is inserted inside a housing, wherein the push button is provided. In order to exert a resistance force in the direction opposite to the pressing direction when pressing, the column portion of the push button is pressed and sandwiched by a pair of plate-shaped springs inside the housing, and the tip of the connecting bar with the intermediate portion supported. A push button switch for an emergency alarm, characterized in that a portion is engaged with a side surface of the column portion, and an end portion of the connecting bar is connected to a lower portion of a return button whose upper portion can project from the surface of the housing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP204392U JPH0594917U (en) | 1992-01-24 | 1992-01-24 | Emergency alarm push button switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP204392U JPH0594917U (en) | 1992-01-24 | 1992-01-24 | Emergency alarm push button switch |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0594917U true JPH0594917U (en) | 1993-12-24 |
Family
ID=11518303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP204392U Pending JPH0594917U (en) | 1992-01-24 | 1992-01-24 | Emergency alarm push button switch |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0594917U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108510680A (en) * | 2018-06-06 | 2018-09-07 | 杭州鸿雁智能科技有限公司 | A kind of emergency alarm device, wall type panel and emergency warning system |
-
1992
- 1992-01-24 JP JP204392U patent/JPH0594917U/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108510680A (en) * | 2018-06-06 | 2018-09-07 | 杭州鸿雁智能科技有限公司 | A kind of emergency alarm device, wall type panel and emergency warning system |
CN108510680B (en) * | 2018-06-06 | 2024-01-16 | 杭州鸿雁智能科技有限公司 | Emergency alarm device, wall panel and emergency alarm system |
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