JP2022052072A - Alarm bell - Google Patents

Abstract

To provide an alarm bell that is reducible in sound pressure.SOLUTION: There is provided an alarm bell 1 that generates an alarm as a gong 2 is hit to sound, and comprises a hood 5 in a cylindrical shape enclosing a circumference of the gong 2. The hood 5 has a height exceeding the overall height of the gong 2. Assuming that the alarm bell 1 is stored and installed in an enclosure, an end part 5c of the enclosure on a front plate side is in contact with or close to a front plate while the hood 5 encloses a circumference of the gong 2 in the enclosure.SELECTED DRAWING: Figure 1

Description

The present invention relates to an alarm bell in which a gong rings and an alarm is issued by a blow.

The alarm bell is provided with a gong that makes a bell sound when hit, a striking rod that strikes the gong, a motor that drives the striking rod, a housing that houses the motor, and the like, and is provided in the event of an emergency such as a fire. It is used as a gong ringing to generate a bell sound and issuing an alarm (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-235394

The main use of this type of alarm bell is an emergency bell (hereinafter, simply referred to as "emergency bell") of a district acoustic device of an automatic fire alarm system or an acoustic device of an emergency alarm system.

Standards for emergency bells are set based on the Fire Service Act. One of the criteria is sound pressure (90 dB or more at a position 1 m away from the center).

The emergency bell may be stored and installed inside a housing such as a fire hydrant box or an equipment storage box. Even in that case, it is necessary to meet the above-mentioned sound pressure standard, but since it is housed inside the housing, the sound pressure may drop and it may be difficult to obtain the required sound pressure. ..

In view of the above circumstances, it is an object of the present invention to obtain an alarm bell capable of increasing the sound pressure.

INDUSTRIAL APPLICABILITY The present invention is an alarm bell, which is an alarm bell in which a gong rings due to a blow to issue an alarm, and is provided with a hood having a cylindrical shape surrounding the gong.

In the present invention, the hood can have a height exceeding the total height of the gong. Further, when the alarm bell is to be housed and installed in the housing, the hood is in a state of surrounding the gong in the housing, and the end portion of the housing on the front plate side. Can be in contact with or in close proximity to the front plate. Further, the hood may be composed of a plurality of parts having the same shape, and the plurality of parts may be assembled. Further, a mounting component for mounting the gong to the mounting target is further provided, and the hood can be mounted on the mounting target together with the gong by the mounting component. Further, when the mounting component has a separable portion and the alarm bell is installed without being housed in the housing, the separable portion is separated from the mounting component. , The gong can be used as a part for attaching to the attachment target.

In the present invention, the gong can be surrounded by a hood. The hood can prevent the bell sound from diffusing around the gong, increase its directivity, and increase its sound pressure.

Therefore, according to the present invention, an alarm bell capable of increasing the sound pressure can be obtained.

Here, in the case of the conventional alarm bell, when it is assumed that it is stored and installed inside the housing, as described above, the sound pressure is lowered by being stored in the housing, and the necessary sound is obtained. It can be difficult to get pressure. However, in the present invention, even if the sound pressure is housed in the housing, the sound pressure can be increased by providing the hood, so that the sound pressure does not decrease unlike the conventional alarm bell. That is, the present invention is particularly suitable when the alarm bell is housed and installed inside the housing, and the advantage of providing the hood is great.

An example of the embodiment of the alarm bell of the present invention is shown, and the entire alarm bell in a state where the hood attached to the mounting bracket surrounds the gong is shown, (a) is a front view, (b). ) Is a perspective view. In the same gong, (a) is a front view and (b) is a back view. (A) is a front view and (b) is a side view in a state where the same hood is attached to the mounting bracket. (A) is a perspective view and (b) is a side view of the parts constituting the same hood. It is a perspective view of the mounting bracket of the same as above. It is a front view of the equipment storage box to which the same alarm bell is attached. It is an enlarged sectional view of a part (the part on the alarm bell side) of the part AA line part of FIG. However, the illustration of the wall plate portion (rear plate, etc.) other than the front plate of the equipment storage box is omitted. It is a front view of the mounting bracket of another example.

Hereinafter, an example of the embodiment of the alarm bell of the present invention will be described as the alarm bell 1 with reference to FIGS. 1 to 8. The alarm bell 1 can be used, for example, as an emergency bell of a district acoustic device of an automatic fire alarm system, an acoustic device of an emergency alarm facility, or the like.

[Basic configuration]
First, the alarm bell 1 includes a gong 2 that generates a bell sound when hit, as shown in FIG. 2, and the gong 2 rings to generate a bell sound in the event of an emergency such as a fire. , Used to issue an alarm. In addition, on the back surface side of the gong 2, a housing 4 for accommodating a driving means (not shown) for driving the striking rod 3 while supporting the striking rod 3 for striking the gong 2 is provided, and the housing 4 is provided. , A hook portion 4a for hooking the gong 2 to the mounting brackets 6 and 7 (an example of mounting parts) described later is provided.

[Food]
The alarm bell 1 is shown in FIG. 1 as being particularly used when the alarm bell 1 is housed and installed inside a housing (specific examples will be described later) such as a fire hydrant box or an equipment storage box. As described above, the hood 5 having a tubular shape surrounding the gong 2 is provided.

In the alarm bell 1, the gong 2 can be surrounded by the hood 5. Then, the hood 5 prevents the bell sound emitted from the side of the gong 2 from diffusing around the gong 2 and is urged forward, so that the directivity can be strengthened and the sound pressure can be increased. Can be raised.

Further, as will be described later, in the alarm bell 1, the sound pressure can be increased by the hood 5 even if it is housed in the housing, so that the sound pressure of the bell sound is lowered like the conventional alarm bell. It never ends up. That is, the alarm bell 1 is particularly suitable when it is housed and installed inside the housing, and the advantage of having the hood 5 is great.

[Specific example of hood]
-Cylindrical portion and opening Specifically, the hood 5 has a cylindrical portion 5a which has a cylindrical shape and is a portion surrounding the gong 2, and the tubular portion 5a thereof. One end 5c has an opening 5b that surrounds the gong 2 and opens toward the front on the surface side of the gong 2 (see FIGS. 1 and 3). As a result, the bell sound emitted from the gong 2 is emitted toward the front on the surface side of the gong 2 along the tubular portion 5a, so that the directivity is strengthened and the sound pressure can be increased.

-Height of the hood Further, it is preferable that the hood 5 has a height exceeding the total height of the gong 2 while surrounding the gong 2 (see FIGS. 1 (b) and 7). That is, when the opening 5b of the tubular portion 5a is located at a height exceeding the total height of the gong 2, all the bell sounds emitted from the side surface of the gong 2 can be directed to the front on the surface side of the gong 2. Thereby, a better effect for increasing the sound pressure of the bell sound emitted from the gong 2 can be obtained. The height of the hood 5 may be the same as the total height of the gong 2, or may be lower than the total height. Further, the height may change in the circumferential direction.

Further, as will be described later, when the alarm bell 1 is housed and installed inside the housing, a bell sound is emitted to a portion of a sound hole provided on the front plate of the housing. The end portion 5c on the front plate side of the hood 5 provided with the opening portion 5b may be in contact with or close to each other. As a result, the bell sound with increased sound pressure emitted from the opening 5b of the hood 5 can be efficiently emitted from the sound hole portion to the outside of the housing.

-Shape of tubular portion In the case of the illustrated example, the tubular portion 5a has a cylindrical portion 5a having a rectangular tubular shape (see FIGS. 1 and 3). The tubular shape may be another polygonal square tubular shape, or may be a cylindrical shape. Further, in the case of the illustrated example, the shape of the cylindrical portion toward the opening 5b is assumed to be tapered. With such a shape, it is possible to make it more suitable for increasing the sound pressure of the bell sound. The shape toward the opening 5b may be a reverse taper shape with a thick tip, or a straight cylinder shape with no change in thickness. In any case, it is preferable that the size of the opening 5b is about the same as the size of the sound hole portion of the front plate of the housing (in the case of the examples shown in FIGS. 6 and 7 described later). The size of the opening 5b is slightly larger than that of the sound hole 10b).

-Multiple parts with the same shape In the case of the illustrated example, the hood 5 is formed by assembling two parts 5A and 5A'of the same shape having a shape divided into two evenly in the circumferential direction (Fig.). 4). Specifically, both parts 5A and 5A'have concave portions 5e and convex portions 5f, and concave portions 5e'and convex portions 5f', respectively, on both end faces in the circumferential direction as portions that are fitted to each other between the two parts. (These fitting portions also have the same shape (including the position) between the two parts), and the concave portion 5e of one part 5A and the convex portion f'of the other part 5A'are fitted together. By fitting the convex portion 5f of one component 5A and the concave portion 5e'of the other component 5A', the hood 5 is assembled to each other to form a tubular hood 5.

When the hood 5 is composed of a plurality of parts having the same shape such as two parts 5A and 5A', and the plurality of parts are made into a molded product of a synthetic resin material, the molding die is set to 1. It can be combined and the manufacturing cost can be reduced. The number of parts having the same shape constituting the hood 5 may be larger than two, but it is advantageous to have two in terms of ease of assembly.

The mounting portion hood 5 has mounting portions 5d and 5d'to the mounting bracket 6 (an example of mounting parts) described later at the end opposite to the opening 5b (FIG. 3 (b). ) And Fig. 7). In the case of the illustrated example, the mounting portions 5d and 5d'are provided as recesses into which the insertion portion on the mounting bracket 6 side is inserted. The mounting portion 5d will be further described later together with the description of the mounting bracket 6.

[Mounting bracket (example of mounting parts)]
The alarm bell 1 is further provided with a mounting bracket 6 used to mount the gong 2 at a predetermined position in the housing when the alarm bell 1 is to be housed and installed inside the housing.

The mounting bracket 6 is made of a metal plate member, and in the case of the illustrated example, the bottom plate portion 6a is mounted at a predetermined position in the housing by a fixing means (screw fastening or the like), and both ends of the bottom plate portion 6a in the length direction. It has a standing piece portion 6b, 6b provided and has a U-shaped cross section (see FIG. 5). The mounting bracket 6 is mounted at a predetermined position in the housing with the standing pieces 6b and 6b oriented to the left and right. A receiving portion 6c for hooking the gong 2 is provided in the central portion of the bottom plate portion 6a, and the gong 2 is inserted into the hook portion 4a of the housing 4 on the back surface side from above into the receiving portion 6c. Therefore, the surface side can be hooked on the bottom plate portion 6a so as to face forward.

The hood 5 is attached to the mounting bracket 6 so as to surround the gong 2. Specifically, the two parts 5A and 5A'of the hood 5 are assembled to each other from both sides of the bottom plate portion 6a in the width direction so as to sandwich the gong 2 up and down, and to the mounting portions 5d and 5d'provided on both parts. By inserting both ends of the bottom plate portion 6a in the width direction, the tubular portion 5a is attached to the mounting bracket 6 in a state of surrounding the gong 2 on the bottom plate portion 6a (see FIG. 7).

In the mounting bracket 6, the left and right standing pieces 6b and 6b are provided so as to be located on the outside of the hood 5 with the hood 5 attached. The standing pieces 6b and 6b function as guards for the hood 5 located inside.

[Specific example of storage inside the housing]
As described above, the alarm bell 1 may be housed and installed inside a housing such as a fire hydrant box or an equipment storage box. 6 and 7 show an aspect of storing the alarm bell 1 when the alarm bell 1 is stored and installed in the equipment storage box as an example.

The equipment storage box 10 is used for an automatic fire alarm system, and as shown in the figure, an alarm bell 1 is housed as a district acoustic device, and an indicator light and a transmitter (storage part) are housed inside. (Not shown) is stored while exposing a part (display unit 10c, push button unit 10d, etc.) to the outside.

Specifically, as shown in FIG. 7, the alarm bell 1 has a gong 2 and a hood 5 surrounding the gong 2 inside the equipment storage box 10 via a screw hole provided in the mounting bracket 6. It is attached and fixed to a frame member provided on the front plate 10a with screws and stored.

At this time, the hood 5 is in a state where the opening 5b opens toward the sound hole portion 10b located in front of the surface side of the gong 2 while surrounding the gong 2.

Therefore, in the alarm bell 1, the sound pressure can be increased by the hood 5 even if it is stored inside the equipment storage box 10, and the bell sound for which the sound pressure is increased is transmitted to the opening 5b and the sound hole portion 10b. It can be discharged to the outside of the equipment storage box 10 via the device storage box 10.

Further, in the case of the illustrated example, the alarm bell 1 has an end portion where the opening portion 5b of the hood 5 is provided close to a portion where the sound hole portion 10b of the front plate 10a is provided. As a result, the bell sound with enhanced sound pressure emitted from the opening 5b of the hood 5 can be efficiently emitted from the sound hole portion 10b to the outside of the equipment storage box 10.

The end portion of the hood 5 where the opening portion 5b is provided may be in contact with the portion of the front plate 10a where the sound hole portion 10b is provided.

[Mounting bracket with separable part (other examples of mounting parts)]
The alarm bell 1 may be installed directly on the wall surface or the like of a building without being housed inside the housing. In that case, it may be installed without attaching the hood 5. The mounting bracket 7 shown in FIG. 8 is an example of a mounting component that can be suitably used when the alarm bell 1 is to be installed without mounting the hood 5.

Like the mounting bracket 6, the mounting bracket 7 is made of a metal plate member, and is provided at both ends of the bottom plate portion 7a in the length direction, which is mounted by a fixing means at a predetermined position in the housing. It has one portion 7b and 7b, and a receiving portion 7c into which the hook portion 4a on the back surface side of the gong 2 is inserted is provided in the central portion of the bottom plate portion 7a.

The mounting bracket 7 differs from the mounting bracket 6 in that the bottom plate portion 7a is provided with a separable portion 7d that can be easily separated by the user. The receiving portion 7c is provided in the separable portion 7d.

If the separable portion 7d is used without separating the mounting bracket 7, the hood 5 can be mounted and the gong 2 can be hooked as in the mounting bracket 6. When the separable portion 7d is separated, the hood 5 cannot be attached, but if the separable portion 7d is used as an attachment part, the gong 2 can be hooked.

That is, the mounting bracket 7 can be separated when the alarm bell 1 is installed with the hood 5 attached, such as when the alarm bell 1 is housed inside the housing and installed. The alarm bell 1 can be used as it is as an attachment component to the attachment target without separating the portion 7d, and the alarm bell 1 is installed without being housed inside the housing. When 1 is to be installed without attaching the hood, the separable portion 7d can be separated and the separated portion can be used as an attachment component to the attachment target.

The method of forming the separable portion 7 may be based on various metal processing techniques. In the case of the illustrated example, it is cut and thinned so that the connecting portion 7e can be easily separated while leaving a small amount of the connecting portions 7e and 7e with the bottom plate portion 7a. Further, the processing method is not limited to this as long as it can be easily separated.

[Example of configuration change]
The configuration of the alarm bell 1 can be changed as follows, for example.

The tubular portion 5a of the hood 5 may be formed by assembling a plurality of parts having different shapes instead of assembling a plurality of parts having the same shape, or may be formed as an integral part. It may consist of one component.

Regarding the attachment of the hood 5, instead of attaching to the attachment fittings 6 and 7, it may be attached to the housing 4.

The hood 5 and the mounting bracket 6 may be manufactured as an integral member instead of being made into separate members.

1: Alarm bell 2: Gong 3: Strike bar 4: Housing 4a: Hook part 5: Hood 5A, 5A'5a: Cylindrical part 5b Opening 5c: End part 5d, 5d': Mounting part 5e, 5e': Recessed part 5f 5, f': Convex part 6: Mounting bracket 6a: Bottom plate 6b: Standing piece 6c: Receiving part 7: Mounting bracket 7a: Bottom plate 7b: Standing piece 7c: Receiving part 7d: Separable part 7e: Connecting part 10 : Equipment storage box 10a: Front plate 10b: Sound hole 10c: Display 10d: Push button

Claims (6)

An alarm bell in which a gong rings upon hitting to issue an alarm, and the alarm bell is provided with a hood having a cylindrical shape surrounding the gong. The alarm bell according to claim 1, wherein the hood has a height exceeding the total height of the gong. When the alarm bell is to be housed and installed in the housing, the hood is in a state of surrounding the gong in the housing, and the end portion of the housing on the front plate side is said. The alarm bell according to claim 1 or 2, wherein the alarm bell is in contact with or in close proximity to the front plate. The alarm bell according to any one of claims 1 to 3, wherein the hood is composed of a plurality of parts having the same shape and the plurality of parts are assembled. One of claims 1 to 4, further comprising a mounting component for mounting the gong to the mounting target, wherein the hood is mounted to the mounting target together with the gong by the mounting component. The alarm bell described in item 1. When the mounting component has a separable portion and the alarm bell is installed without being housed in the housing, the separable portion is separated from the mounting component and described above. The alarm bell according to claim 5, wherein the gong is used as a portion for attaching to an attachment target.

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