alarm

Abstract

To provide an alarm capable of reducing possibility of falling of a lens.SOLUTION: A gas alarm 1 includes: a housing 2; a first lens 14 for introducing light from outside from a front side of the housing 2 and guiding it to a human detection sensor 26 stored in the housing 2; a second lens 15 and a light guide lens 16 for emitting light from a light emitting unit 36 stored in the housing 2 to a front side of the housing 2; and a panel member 3 attached to a front surface of the housing 2. The first lens 14 and the second lens 15 have a first and a second sandwiching units N1, N2 positioned by being sandwiched between the housing 2 and the panel member 3. The light guide lens 16 has a third tucked-in section N3 that is located between the housing 2 and the second lens 15 whose position is held by the panel member 3. The panel member 3 is provided with a cylindrical boss unit BP into which a tip side of a screw S extending from a housing 2 side is inserted and fixed. Through the insertion and fixing, the panel member 3 side and the housing 2 side are connected.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an alarm device.

Background Art

[0002] Conventionally, an alarm device that emits light from a light source such as an LED (Light-Emitting Diode) to the outside to notify a user of various states and the like is known. Such an alarm device includes a lens (light guide) for emitting light from the light source to the outside (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, the lens of the alarm device described in Patent Document 1 is attached by the claws formed on the lens being hooked on the housing of the alarm device. However, when an impact is applied to the alarm device or the like, the hooking by the claws may come off, and the lens may fall off. [[ID=ID=37]]

[0005] Note that this problem is not limited to the lens for emitting light from the light source, but is a common problem also in the lens provided corresponding to the light receiving portion for taking in light from the outside.

[0006] [[ID=ID=43]]The present invention has been made to solve such conventional problems, and an object thereof is to provide an alarm device capable of reducing the possibility of the lens falling off.

Means for Solving the Problems

[0007] The alarm device according to the present invention comprises a housing and a mechanism that emits light from a light source housed in the housing to the front side of the housing, or introduces light from the outside from the front side of the housing and guides it to a light receiving unit housed in the housing. First and second light-transmitting members The enclosure comprises a panel member attached to the front of the housing, and the First light-transmitting member The housing and the panel member are The second light-transmitting member has a first intervening portion that is sandwiched and positioned, The housing and the First light-transmitting member It is positioned between and 2nd intervening part The panel member side and the housing side are connected by a cylindrical boss portion into which the tip end of a long member extending from the other side is inserted and fixed. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an alarm device that can reduce the possibility of the lens falling off. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing the usage state of a gas alarm according to an embodiment of the present invention. [Figure 2] This is a perspective view showing how a gas alarm according to an embodiment of the present invention is installed. [Figure 3] This is a front view showing a gas alarm according to an embodiment of the present invention. [Figure 4] This is a side view showing a gas alarm according to an embodiment of the present invention. [Figure 5] Figures 1 to 4 show disassembled perspective views of the gas alarm. [Figure 6] Figures 1 to 4 are front views showing the gas alarm with the panel component removed. [Figure 7] Figures 1 to 4 show cross-sectional views of the gas alarm as seen from the rear, specifically the front side of the control board. [Figure 8] Figures 1 to 4 are front views showing the gas alarm with the cover and panel components removed. [Figure 9] This is an enlarged cross-sectional view showing the claw and the area around the claw engagement portion. [Figure 10] Figure 3 shows cross-sectional views AA, where (a) shows the cross-section of the push button when it is not pressed, and (b) shows the cross-section of the push button when it is pressed. [Figure 11] Figure 3 is a cross-sectional view of BB. [Modes for carrying out the invention]

[0010] The present invention will be described below in accordance with preferred embodiments. It should be noted that the present invention is not limited to the embodiments shown below, and can be modified as appropriate without departing from the spirit of the invention. For example, in the embodiments shown below, a gas alarm is described as an example of an alarm, but it is not limited to a gas alarm; it may also be a fire alarm or a gas and fire integrated alarm capable of detecting and alarming both gas and fire. Furthermore, it may also be a security alarm that detects intruders, etc. Also, in the embodiments shown below, some components are not illustrated or described, but it goes without saying that the details of the omitted technologies are appropriately based on publicly known or well-known technologies, to the extent that they do not contradict the content described below.

[0011] Figure 1 is a perspective view showing the gas alarm in use according to an embodiment of the present invention, and Figure 2 is a perspective view showing how the gas alarm according to an embodiment of the present invention is installed. Figure 3 is a front view showing the gas alarm according to an embodiment of the present invention, and Figure 4 is a side view showing the gas alarm according to an embodiment of the present invention.

[0012] As shown in Figure 1, the gas alarm 1 according to this embodiment is a ceiling-mounted alarm that is attached to a rotating mounting part A provided on the ceiling. As shown in Figure 2, the gas alarm 1 has a structure that allows it to be attached to the rotating mounting part A by rotating it, similar to existing lighting devices.

[0013] As shown in Fig. 4, the gas alarm 1 has a contact C on the back side which is the ceiling side. The contact C is a metal member protruding to the back side. Also, as shown in Fig. 2, the rotary mounting part A also has an electrical contact B. The electrical contact B is located at the bottom of the first groove G1 provided in the rotary mounting part A. When the gas alarm 1 is attached to the rotary mounting part A, the contact C on the gas alarm 1 side contacts the electrical contact B of the rotary mounting part A. As a result, the power supply of the gas alarm 1 is turned on.

[0014] Furthermore, as shown in Fig. 4, in addition to the contact C, the gas alarm 1 has a signal terminal (voltage - having contact) D on the back side. This signal terminal D is configured to fit into the second groove G2 shown in Fig. 2 in the state of being attached to the rotary mounting part A, and functions to transmit a so - called voltage - having signal. The voltage - having signal becomes a 0V signal, for example, when the gas alarm 1 is removed from the rotary mounting part A or when there is a disconnection, becomes a 6V signal when the gas alarm 1 is in a normal monitoring state, and becomes a 12V signal when the gas alarm 1 is in an alarm state. The voltage - having signal is transmitted to, for example, an alarm monitoring panel such as the management room of an apartment building.

[0015] Such a gas alarm 1 includes at least a housing 2 that houses a light - emitting part (light source) 36, a human - sensing sensor (light - receiving part) 26, a speaker 34, a gas sensor 24 (see Fig. 8 described later), etc. The housing 2 has an appearance of a thin - type substantially cylindrical shape, and as shown in Figs. 3 and 4, has a housing main body 2a and a lid body 2b. The housing main body 2a is a lower case that constitutes the back side of the housing 2, and is a bottomed cylindrical member with an open front side. The lid body 2b is an upper case that covers the housing main body 2a from the front side which is the open side (lower side in the state of being attached to the rotary mounting part A). Also, in the gas alarm 1 according to the present embodiment, a panel member 3 is attached to the front surface of the housing 2. The panel member 3 is a plate material that fits into a recess D1 (see Fig. 6 described later) formed on the front side of the lid body 2b. The panel member 3 is substantially circular in accordance with the shape of the housing 2. [[ID=​In addition, as shown in FIG. 4, the gas alarm 1 has a push button 10 on the side surface of the housing 2. The gas alarm 1 according to the present embodiment has a function of communicating with an external server (not shown). The push button 10 is an operation unit for performing communication settings so as to be communicatively connected to the external server. When the push button 10 is operated, a communication switch 30 (see FIG. 8 described later) is turned on.

[0017] Furthermore, as shown in FIG. 3, the gas alarm 1 has a stop button 12 on the front side. The stop button 12 is an operation unit for stopping the alarm operation when the gas alarm 1 is performing an alarm operation (sound output and light emission). This stop button 12 is formed by a part (lower right part) of the panel member 3, and the concave portion D2 (see FIG. 6 described later) is provided in the lid body 2b so that it can be elastically deformed in the back direction. An alarm stop switch 32 (see FIG. 8 described later) is provided on the back side of the stop button 12. When the stop button 12 is elastically deformed, the first lever member L1 (see FIG. 6 described later) is bent and the alarm stop switch 32 is turned on.

[0018] As described above, the gas alarm 1 according to the present embodiment separately provides the push button 10 and the stop button 12. Here, if the push button 10 and the stop button 12 are formed by one operation unit, it is necessary to make the communication setting and the operation of stopping the alarm different, and each operation tends to become complicated. However, by providing them separately, the complication of the operation can be suppressed. <统一替换为

[0019] FIG. 5 is an exploded perspective view of the gas alarm 1 shown in FIGS. 1 to 4. FIG. 6 is a front view showing the state when the panel member <统一替换为3> is removed from the gas alarm 1 shown in FIGS. 1 to 4, and FIG. 7 is a cross-sectional view of the gas alarm <统一替换为1> shown in FIGS. <统一替换为1> to <统一替换为4> when viewed from the back side, showing a cross-section on the front side of the control board. FIG. 8 is a front view showing the state when the lid body <统一替换为2b> and the panel member <统一替换为3> are removed from the gas alarm <统一替换为1> shown in FIGS. <统一替换为1> to <统一替换为4>. [[ID=统<一替换为14]]

[0020] [[ID=统<一替换为15]] As shown in Figure 5, the panel member 3 is equipped with multiple claws CL. These multiple claws CL engage with claw engagement portions 2c (Figures 5 and 6) formed within the recess D1 by utilizing the hooking of the claws CL. Through this engagement, the panel member 3 is assembled to the lid 2b.

[0021] Figure 9 is an enlarged cross-sectional view showing the area around the claw CL and the claw engagement portion 2c. As shown in Figure 9, the claw CL has a laterally extending hook portion CL1 on its tip side. The panel member 3 engages with the lid 2b when this hook portion CL1 catches on the claw engagement portion 2c. Here, the height of the hook portion CL1 is less than the thickness of the plate constituting the claw engagement portion 2c. That is, the height of the hook portion CL1 is set so as not to exceed one side (the side furthest from the claw CL) F of the plate material constituting the claw engagement portion 2c. In this way, the amount of engagement of the claw CL is reduced in this embodiment. Furthermore, the gas alarm 1 according to this embodiment is equipped with a boss portion BP (see Figures 5, 7, and 11) and the like, which will be described later, thereby reducing the possibility of the panel member 3 coming off even with a small amount of engagement of the claw CL. Details will be described later.

[0022] As shown in Figures 5 and 6, the gas alarm 1 comprises a first lens (lens) 14, a second lens (lens, other components) 15, and a light guide lens (lens) 16. The first lens 14 is a light-transmitting member located on the upper front side of the gas alarm 1 and is circular when viewed from the front (plan view from the front). A motion sensor 26 is provided on the back side of the first lens 14. The first lens 14 plays the role of guiding light from the front side of the housing 2 to the motion sensor 26.

[0023] The second lens 15 is a light-transmitting member that is located on the upper front side of the gas alarm 1 and has an arc shape when viewed from the front. A light guide lens 16 is provided on the back side of the second lens 15. The light guide lens 16 is also made of a light-transmitting member that has an arc shape when viewed from the front, similar to the second lens 15. The tip 16a of the light guide lens 16 is positioned to pierce a recess D5 (see Figure 11, described later) formed on the back side of the second lens 15. A light-emitting part 36 is provided on the back side of the light guide lens 16. Light emitted by the light-emitting part 36 enters the light guide lens 16, passes through the light guide lens 16 to the second lens 15, and is emitted from the second lens 15 to the front side of the housing 2.

[0024] As shown in Figure 3, the gas alarm 1 has a speaker hole 18 and a gas hole 20 on its front side. The speaker hole 18 is an arc-shaped hole formed approximately to the right of the stop button 12 when viewed from the front. A speaker 34 (see Figures 5 and 6) is provided on the back side of the speaker hole 18. The gas hole 20 is an arc-shaped hole formed on the lower left side of the gas alarm 1 when viewed from the front. A gas sensor 24 (see Figure 8) is provided on the back side of the gas hole 20. These speaker hole 18 and gas hole 20 allow sound from the speaker 34 and the target gas to pass through smoothly.

[0025] As shown in Figures 5 and 8, the gas alarm 1 includes a control board 22 within the housing body 2a that extends horizontally when mounted on the rotating mounting part A (see Figures 1 and 2). Also, as shown in Figures 5 to 8, the gas alarm 1 includes a gas sensor 24, a human presence sensor 26, a communication module 28, a communication switch 30, an alarm stop switch 32, a speaker 34, and a light-emitting part 36.

[0026] The control board 22 shown in Figures 5 and 8 houses the main components of the gas alarm 1. The gas sensor 24 shown in Figure 8 is for detecting abnormalities in the monitoring area. In this embodiment, the gas sensor 24 is a semiconductor gas sensor that reacts to target gases such as city gas and carbon monoxide, and outputs a signal corresponding to the concentration of the target gas to a control unit (not shown), such as a main microcontroller. This gas sensor 24 is provided in correspondence with the notch 22a formed in the control board 22. The gas introduction portion 24a of the gas sensor 24 is installed so as to face the gas storage chamber GR formed in correspondence with the gas hole 20.

[0027] The human presence sensor 26 shown in Figures 5 and 8 is for detecting the presence of people in the surrounding area. A first lens 14 is provided on the front side of the human presence sensor 26, and infrared rays from, for example, living organisms (light from outside the housing 2) are guided to the human presence sensor 26 by the first lens 14. The human presence sensor 26 outputs a signal corresponding to the infrared rays guided by the first lens 14 to a control unit such as a main microcontroller. The control unit determines the presence or absence of people based on the signal from the human presence sensor 26. Note that the human presence sensor 26 is not limited to one that uses infrared rays; for example, it may be one that detects moving objects using ultrasound and determines that the moving object is a living organism.

[0028] The communication module 28 shown in Figures 5 and 8 communicates with an external server owned by a gas company or the like via a communication line. This communication module 28 communicates with the external server by wirelessly connecting to a home router (not shown) using, for example, the wireless communication standard Wi-Fi®, enabling the sending and receiving of information with the external server.

[0029] The communication switch 30 shown in Figure 8 is an operation switch that starts a setting mode for performing communication settings. This communication switch 30 is mounted on the control board 22 facing the direction of the push button 10, that is, with the pressing direction facing sideways relative to the board plane. This communication switch 30 turns on when the push button 10 is pressed. In this embodiment, the gas alarm 1 starts the setting mode when the communication switch 30 is turned on when the power is turned on. In this setting mode, the communication module 28 is wirelessly connected to the in-house router and communicates with an external server.

[0030] Figure 10 is a cross-sectional view of AA shown in Figure 3, where (a) shows the cross-section of the push button 10 when it is not pressed, and (b) shows the cross-section of the push button 10 when it is pressed.

[0031] As shown in Figures 10(a) and 10(b), the gas alarm 1 is equipped with a second lever member L2 that extends from the back side of the cover 2b and is located inside the housing 2. The second lever member L2 is a cantilevered member that extends from the cover 2b toward the control board 22, and its tip is interposed between the push button 10 and the communication switch 30. As shown in Figure 10(a), the second lever member L2 is positioned so as not to press the communication switch 30 when no external force is applied. Also, as shown in Figure 10(b), when the push button 10 is pressed, the second lever member L2 bends toward the communication switch 30 to turn on the communication switch 30. When the pressing operation is released, the second lever member L2 elastically returns to the position shown in Figure 10(a). In this operation, the second lever member L2 provides a click sensation when the push button 10 is pressed and also prevents the push button 10 from remaining pressed (i.e., stuck down).

[0032] In addition, as shown in Figures 10(a) and 10(b), the lever member L2 has three bent portions BE, forming an M-shape in cross-section. By providing multiple bent portions BE, it is possible to prevent stress from concentrating in one place and reduce the possibility of breakage compared to the case where there is only one bent portion BE.

[0033] Figure 11 is a cross-sectional view of BB shown in Figure 3. As shown in Figures 5 and 11, in this embodiment, the first lens 14, the second lens 15, and the light guide lens 16 are provided with a clamping portion N. The clamping portion N is a part that is clamped by the panel member 3, the cover 2b, etc., in a state where it is in contact with or close proximity to the front and rear (front side and back side).

[0034] To explain in detail, the first lens 14 is equipped with a first clamping portion N1, as shown in Figure 5. The first clamping portion N1 is a flange formed around the first lens 14 in a substantially circular shape to match the shape of the first lens 14. When the various parts constituting the gas alarm 1 are assembled, the first lens 14 fits into the recess D4 of the lid 2b, and a panel member 3 is provided on the front side. The panel member 3 has a lens hole 3a formed therein to expose a part of the first lens 14. Therefore, the main body portion 14a, which is a part of the first lens 14, is exposed from the front side. On the other hand, the first clamping portion N1 of the first lens 14 is not exposed from the front side, but is clamped between the panel member 3 and the housing 2 (lid 2b). Through this clamping, the first lens 14 is attached to the housing 2 without being locked to the housing 2 by a claw.

[0035] Similarly, the second lens 15 is provided with a second clamping portion N2, as shown in Figures 5 and 11. The second clamping portion N2 is a flange formed in a substantially arc shape on the lower side of the second lens 15 to match the shape of the second lens 15. When the various parts constituting the gas alarm 1 are assembled, the second lens 15 fits into the recess D4 of the lid 2b, and a panel member 3 is provided on the front side. The panel member 3 has a notch 3b formed at its upper end to expose a part of the second lens 15. As a result, the main body portion 15a, which is a part of the second lens 15, is exposed from the front side. On the other hand, the second clamping portion N2 of the second lens 15 is not exposed from the front side, but is clamped between the panel member 3 and the housing 2 (lid 2b). Through this clamping, the second lens 15 is attached to the housing 2 without being locked to the housing 2 by a claw.

[0036] Furthermore, as shown in Figures 5 and 11, the light guide lens 16 is provided with a third clamping portion N3. The third clamping portion N3 is formed in a substantially arc shape above and below the light guide lens 16, to match the shape of the light guide lens 16. When the various parts constituting the gas alarm 1 are assembled, the light guide lens 16 fits into a groove G3 formed in the recess D4 of the lid 2b, and the second lens 15 is provided on the front side. As shown in Figure 11, the light guide lens 16 has a cross-shaped cross section, and the front end 16a of the cross is positioned to pierce the rear recess D5 of the second lens 15. On the other hand, the rear end 16b of the cross is close to the light-emitting portion 36. The above-mentioned third clamping portion N3 is formed as the part of the light guide lens 16 that extends laterally from the cross. Furthermore, the lid 2b is provided with a wall portion 2e that extends toward the rear side in the groove G3. The wall portion 2e is formed circumferentially to match the shape of the groove G3 and has a protruding piece 2f that protrudes inward from the circumferential wall portion 2e. The protruding piece 2f protrudes so as to be located on the rear side of the third clamping portion N3. The second lens 15 also has recess walls DW located on both sides of the recess D5. The recess walls DW are located on the front side of the third clamping portion N3. In addition, as described above, the second lens 15 is prevented from falling out to the front side by the panel member 3 and its position is maintained. Therefore, the third clamping portion N3 is clamped between the second lens 15 (especially the recess walls DW) and the housing 2 (especially the protruding piece 2f), whose position is maintained by the panel member 3. Thus, the light guide lens 16 is attached to the housing 2 side by being clamped between the second lens 15 and the housing 2, without being locked to the housing 2 by a claw.

[0037] In addition, as shown in Figures 5 and 11, the panel member 3 is equipped with a boss portion BP. The gas alarm 1 is also equipped with a screw (long member) S. The screw S is a long member that extends from the housing 2 side to the panel member 3 side and has a threaded surface, and is inserted into a through hole TH formed in the housing body 2a. The screw threads SB of the screw S are located on the back surface of the housing body 2a. The boss portion BP is a cylindrical portion into which the tip of the screw S is inserted and fixed, and is formed extending from the panel member 3 toward the back surface. The boss portion BP extends to a position near the control board 22. In order for the boss portion BP to reach the vicinity of the control board 22, a through hole 2d is formed in the lid 2b as shown in Figure 6. The boss portion BP extending from the panel member 3 is inserted into the through hole 2d as shown in Figure 7.

[0038] In the gas alarm 1 according to this embodiment, the tip of the screw S is inserted and fixed by screwing it into the boss portion BP. On the other hand, the thread SB at the rear end of the screw S is located on the back of the housing 2 (particularly on the back side of the through hole TH in the housing body 2a). As a result, the housing 2 and the panel member 3 are connected in a way that prevents them from separating. This connection provides a strong mounting state between the housing body 2a and the panel member 3 using the screw S, and the lenses 14 to 16, whose clamping portions N are sandwiched by the panel member 3, are also firmly attached, greatly reducing the possibility of them falling off.

[0039] Furthermore, as shown in Figure 11, it is preferable that a guide wall GW is formed in the through hole TH, extending to a position close to the boss portion BP. This facilitates the insertion of the screw S. In addition, it is preferable that the guide wall GW also penetrates the control board 22. This is because the guide wall GW penetrating the control board 22 provides a positioning effect when assembling the control board 22.

[0040] In the example shown in Figure 11, the panel member 3 is shown to have a boss portion BP and is fastened with screws. However, the configuration is not limited to this, and the housing 2 side may have a boss portion BP and be fastened with screws S extending from the panel member 3 side. Alternatively, a simple pin-shaped rod member may be used instead of screws S, and the rod member may be press-fitted into the boss portion BP. Furthermore, if a pin-shaped rod member is provided, the rear end of the rod member may be integrated with the back surface of the housing body 2a, or it may have a rear end similar to a screw thread SB, and this rear end may be located on the back side of a through hole TH or the like and connected so as not to be separated.

[0041] Furthermore, as shown in Figure 5, it is preferable that the screw S and boss portion BP be located on the same side as the lenses 14-16 when viewed from the front in plan. That is, when the gas alarm 1 is divided into two halves, the side where the lenses 14-16 are installed and the opposite side, it is preferable that the screw S and boss portion BP be located on the side where the lenses 14-16 are installed. This is because, even if the engagement between the claw CL and the claw engagement portion 2c is released due to impact or the like, the screws S and boss portion BP are located relatively close to the lenses 14-16, making it possible to prevent the lenses 14-16 from falling off simply by inserting and fixing the screw S to the boss portion BP.

[0042] In this embodiment, since the gas alarm 1 is circular when viewed from the front, one of the semicircles obtained by dividing the area by a straight line passing through the center of the circle can be designated as the installation side and the other as the opposite side. If the gas alarm 1 is rectangular or the like, for example, one of the semicircles obtained by dividing the area by a line along the longer side of the rectangle, or by a line along the shorter side of the rectangle, can be designated as the installation side and the other as the opposite side.

[0043] Next, the operation of the gas alarm 1 according to this embodiment will be explained. First, in the gas alarm 1 according to this embodiment, the panel member 3 is firmly fixed to the housing 2 by screws S and boss portion BP. In addition, the panel member 3, together with the housing 2, clamps the first and second clamping portions N1 and N2 of the first lens 14 and the second lens 15. As a result, the lenses 14 and 15 are clamped by the firmly fixed panel member 3, and the possibility of the lenses 14 and 15 falling off is greatly reduced compared to when the lenses 14 and 15 are assembled to the housing 2 using the catch of claws.

[0044] Furthermore, in the gas alarm 1 according to this embodiment, the position of the second lens 15 is held by the panel member 3, and the third clamping portion N3 of the light guide lens 16 is clamped between the second lens 15 and the housing 2. As a result, the light guide lens 16 is clamped using the second lens 15, whose position is held by the firmly fixed panel member 3, and the possibility of the light guide lens 16 falling off is greatly reduced.

[0045] In particular, by firmly fixing the panel member 3 with such screws S and boss portion BP, the height of the hook portion CL1 of the claw CL of the panel member 3 can be reduced, as shown in Figure 9. As a result, engagement between the claw CL of the panel member 3 and the claw engagement portion 2c can be performed with relatively little force, improving assembly workability.

[0046] Furthermore, in this embodiment of the gas alarm 1, since the panel member 3 is engaged with the housing 2 by a claw CL, it is conceivable that the engagement of the claw CL may be released by impact. However, since the screw S and the boss portion BP are located on the same side as the lenses 14-16, even if the engagement of the claw CL is released, it is possible to prevent the lenses 14-16 from falling off simply by inserting and fixing the screw S to the boss portion BP.

[0047] In addition, the second lens 15 has an overall arc shape, and the second clamping portion N2 is also arc-shaped. Compared to a straight member, such an arc-shaped member suppresses rotation when viewed from the front and reduces rattle. The same applies to the light guide lens 16.

[0048] In this way, according to the gas alarm 1 of this embodiment, a panel member 3 is attached to the front of the housing 2, and the lenses 14 to 16 have a clamping portion N that is positioned between the housing 2 and the panel member 3, etc. Therefore, as long as the panel member 3 does not come off, the lenses 14 to 16 are held in position by the clamping portion N and are prevented from falling off. In particular, since the panel member 3 and the housing 2 are fixed to each other by screws S inserted into boss portion BP, the panel member 3 is more firmly attached to the housing 2 than when the panel member 3 is simply assembled to the housing 2 by the catch of a claw, and the possibility of it falling off is reduced. Therefore, the possibility of the lenses 14 to 16 falling off due to the panel member 3 falling off is also reduced. Thus, the possibility of the lenses 14 to 16 falling off can be reduced.

[0049] Furthermore, since the screw S and boss portion BP are located on the same side as the lenses 14-16, even if all other means for assembling the panel member 3 to the housing 2 were to come loose, the screws S and boss portion BP are located relatively close to the lenses 14-16, making it possible to prevent the lenses 14-16 from falling out simply by inserting and fixing the screw S to the boss portion BP. Therefore, the possibility of the lenses 14-16 falling out can be further reduced.

[0050] Furthermore, since the second lens 15 and the light guide lens 16 have arc-shaped second and third clamping portions N2 and N3, the second lens 15 and the light guide lens 16 are clamped in an arc shape. Compared to the case where they are clamped in a straight line, rotation when viewed from above is suppressed, and rattle can be reduced.

[0051] Although the present invention has been described above based on embodiments, the present invention is not limited to the above embodiments, and modifications may be made without departing from the spirit of the invention, and other technologies may be combined as appropriate to the extent possible.

[0052] For example, although the gas alarm 1 according to this embodiment has been described as an alarm for city gas where the reducing gas to be detected is methane gas, it is not limited to this, and may also be an alarm for LP gas where the gas to be detected is propane gas or butane gas, etc. Furthermore, the gas alarm 1 may be configured as a gas fire alarm that also has a fire alarm function. In addition, the gas alarm 1 according to this embodiment is not limited to a ceiling-mounted type, but may also be a stationary alarm installed in other locations such as near the ceiling or on the wall at floor level.

[0053] Furthermore, the gas alarm 1 according to this embodiment may not have threaded screws S, but simply have an unthreaded rod-shaped member, and the rod-shaped member may be press-fitted into the boss portion BP. Moreover, the rod-shaped member is not limited to press-fitting; it may also have a projection or the like on its tip that can be fixed in place, so that it cannot be removed once inserted into the boss portion BP.

[0054] Furthermore, the gas alarm 1 according to this embodiment includes a first lens 14 that guides light from the outside to the motion sensor 26, and a second lens 15 and a light guide lens 16 that cause light from the light-emitting unit 36 ​​to be emitted to the front. However, it is not limited to this, and may also include only the first lens 14 that guides light from the outside, or only the second lens 15 or the light guide lens 16 that causes light from the light-emitting unit 36 ​​to be emitted to the front.

[0055] Furthermore, in the gas alarm 1 according to this embodiment, the screw S is inserted from the rear side of the housing 2, but it is not limited to this, and it may also be configured to be screwed in from a position that is on the front side of the housing body 2a and on the rear side of the control board 22. In this case, the screw thread SB is located on the rear side of the control board 22, and the housing 2 is connected to the panel member 3 side via the control board 22.

[0056] Furthermore, in this embodiment, the first lens 14 has a first clamping portion N1 in a circumferential shape to match the shape of the first lens 14, and the second lens 15 and the light guide lens 16 have second and third clamping portions N2 and N3 in an arc shape to match the shapes of these lenses 15 and 16. However, the clamping portions N are not limited to the shape of the lenses, and may be provided intermittently at regular intervals, for example. In other words, the clamping portions N are not limited to their shape, and should be a structure that reduces the possibility of the lenses 14 to 16 falling by being clamped by the panel member 3 or the like. [Explanation of symbols]

[0057] 1: Gas alarm (alarm) 2: Cabinet 3: Panel components 14: First lens (lens) 15: Second lens (lens, other components) 16: Light guide lens (lens) 26: Human presence sensor (light receiving part) 36: Light-emitting part (light source) BP: Boss Section L2: Second lever member N: Clamping part S: Screw (long component)

Claims

1. The casing and First and second light-transmitting members that cause light from a light source housed in the housing to be emitted to the front side of the housing, or introduce light from the outside into the front side of the housing and guide it to a light-receiving section housed in the housing, The enclosure comprises a panel member attached to the front of the housing, The first light-transmitting member has a first intervening portion that is positioned sandwiched between the housing and the panel member. The second light-transmitting member has a second intervening portion that is positioned sandwiched between the housing and the first light-transmitting member. One of the panel member side and the housing side is provided with a cylindrical boss portion into which the tip end of a long member extending from the other is inserted and fixed. The panel member and the housing are connected by the insertion and fixing method. A warning device characterized by the following features.

2. The first light-transmitting member has a recess on the side of the second light-transmitting member, The second light-transmitting member has a tip portion that is positioned to pierce the recess of the first light-transmitting member. The alarm device according to feature 1.

3. The panel member is provided with a plurality of claws having a hooking portion at the tip, The housing has a claw engagement portion into which the plurality of claws engage, The aforementioned gripping portion has a tapered shape in cross-section, with the thickness increasing from the tip to the rear end, and the thickness at the rear end is less than the thickness of the plate constituting the claw engagement portion. The alarm device according to feature 1.

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