Alarm bell

Abstract

To provide an alarm bell capable of increasing sound pressure by strengthening directivity.SOLUTION: In an alarm bell, a mounting component 7 comprises: a bottom plate part 7a; a separable part 7d; a receiving part 7c; and a connecting part 7e. And a hood surrounding a gong can be attached to a mounting object together with the gong, which sounds an alarm by striking it. The separable part 7d is provided on the bottom plate part 7a and is also detachably connected. When the alarm bell is installed without attaching the hood, the separable part 7d is detached from the mounting component 7 and can be used as a part for attaching the gong to the mounting object.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] This invention relates to an alarm bell that sounds an alarm by striking a gong. [Background technology]

[0002] An alarm bell comprises a gong that produces a bell sound when struck, a striker that strikes the gong, a motor that drives the striker, and a housing that houses the motor. In the event of an emergency such as a fire, the gong sounds, producing a bell sound and issuing an alarm (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-235394 Summary of the Invention [Problem to be solved by the invention]

[0004] The main uses of this type of alarm bell are as local sounding devices in automatic fire alarm systems and emergency bells in sounding devices in emergency alarm systems (hereinafter simply referred to as "emergency bells").

[0005] Emergency bells are subject to standards set by the Fire Service Act, including a sound pressure level of 90 dB or more at a distance of 1 m from the center.

[0006] Emergency bells are sometimes installed inside a housing such as a fire hydrant box or equipment storage box. Even in this case, the sound pressure standard must be met, but being installed inside a housing can reduce the sound pressure, making it difficult to obtain the required sound pressure.

[0007] SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an alarm bell that can increase sound pressure. [Means for solving the problem]

[0008] This invention is an alarm bell that sounds an alarm when struck by a gong, and is equipped with a cylindrical hood that surrounds the gong, and further includes an attachment part for attaching the gong to an object to which it is to be attached, and the hood is attached to the object together with the gong by the attachment part, and the attachment part has a bottom plate portion and a detachable part, and the detachable part is provided on the bottom plate portion and is detachably connected to it, so that when the alarm bell is to be installed without attaching the hood, the detachable part can be detached from the attachment part and used as a part for attaching the gong to the object to which it is to be attached.

[0009] In the present invention, the attachment part may be plate-shaped. [Effects of the Invention]

[0010] In this invention, the gong can be surrounded by a hood, which prevents the bell sound from diffusing around the gong, making the sound more direct and increasing the sound pressure.

[0011] Therefore, according to the present invention, an alarm bell capable of increasing sound pressure is obtained.

[0012] In the case of conventional alarm bells, when the bell is installed inside a housing, as mentioned above, the housing reduces the sound pressure, making it difficult to obtain the required sound pressure. However, in the case of this invention, even when the bell is installed inside a housing, the sound pressure can be increased by providing a hood, so the sound pressure does not decrease as in the case of conventional alarm bells. In other words, this invention is particularly suitable for cases in which the alarm bell is installed inside a housing, and the provision of a hood provides significant advantages. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B show an example of an embodiment of the alarm bell of the present invention, showing the entire alarm bell with the hood attached to the mounting bracket surrounding the gong, with (a) being a front view and (b) being a perspective view. [Figure 2] (a) is a front view and (b) is a back view of the same gong. [Figure 3] 1A is a front view of the hood attached to the mounting bracket, and FIG. 1B is a side view of the hood attached to the mounting bracket. [Figure 4] 1A and 1B are a perspective view and a side view, respectively, of components constituting the hood of the same as above. [Figure 5] FIG. [Figure 6] FIG. 2 is a front view of the equipment housing box to which the alarm bell is attached. [Figure 7] 7 is an enlarged cross-sectional view of a portion (the portion on the alarm bell side) of the line AA in Fig. 6. However, wall panel portions (such as the back panel) other than the front panel of the equipment housing box are not shown. [Figure 8] FIG. 10 is a front view of another example of a mounting bracket. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1 to 8, an example of an embodiment of the alarm bell of the present invention will be described as an alarm bell 1. The alarm bell 1 can be used, for example, as a district sounding device in an automatic fire alarm system or as an emergency bell in a sounding device in an emergency alarm system.

[0015] [Basic configuration] First, alarm bell 1, as shown in Figure 2, is equipped with gong 2 that rings when struck and is used to sound an alarm in the event of an emergency such as a fire. On the back side of gong 2 is provided housing 4 that supports striking rod 3 that strikes gong 2 and houses drive means (not shown) for driving striking rod 3, etc. Housing 4 is provided with a hook portion 4a for hooking gong 2 onto mounting brackets 6 and 7 (examples of mounting parts) that will be described later.

[0016] [Food] The alarm bell 1 is particularly suited for use when it is housed and installed inside a housing such as a fire hydrant box or an equipment storage box (specific examples will be described later), and as shown in Figure 1, it is provided with a cylindrical hood 5 that surrounds the gong 2.

[0017] In the alarm bell 1, the gong 2 can be surrounded by a hood 5. The hood 5 prevents the bell sound emitted from the side of the gong 2 from diffusing around the gong 2 and instead directs the sound forward, thereby strengthening the directionality and increasing the sound pressure.

[0018] Furthermore, as will be explained later, even when alarm bell 1 is housed in a housing, the sound pressure can be increased by hood 5, so the sound pressure of the bell sound does not decrease as in conventional alarm bells. In other words, alarm bell 1 is particularly suitable for installation housed inside a housing, and the provision of hood 5 offers great advantages.

[0019] [Specific examples of food] Cylindrical part, opening Specifically, hood 5 has a cylindrical portion 5a that surrounds gong 2. One end 5c of cylindrical portion 5a has opening 5b that opens toward the front of the gong 2 (see FIGS. 1 and 3). This causes the bell sound emitted from gong 2 to travel along cylindrical portion 5a and be emitted toward the front of the gong 2, enhancing directionality and increasing sound pressure.

[0020] Hood height Furthermore, it is preferable that the hood 5, when surrounding the gong 2, has a height that exceeds the overall height of the gong 2 (see Figures 1(b) and 7). In other words, by positioning the opening 5b of the cylindrical portion 5a at a height that exceeds the overall height of the gong 2, all of the bell sound emitted from the side of the gong 2 can be directed forward toward the front surface of the gong 2. This provides a more effective effect in increasing the sound pressure of the bell sound emitted from the gong 2. The height of the hood 5 may be the same as the overall height of the gong 2 or may be lower than that overall height. Furthermore, the height may vary circumferentially.

[0021] Furthermore, as will be explained later, when alarm bell 1 is installed housed inside a housing, end 5c on the front panel side of hood 5, where opening 5b from which bell sound is emitted, is provided, can be in contact with or close to the sound hole provided in the front panel of the housing. This allows the bell sound, with increased sound pressure emitted from opening 5b of hood 5, to be efficiently emitted outside the housing from the sound hole.

[0022] - Shape of the cylindrical part In the illustrated example, the hood 5 has a cylindrical portion 5a that is a rectangular tube (see FIGS. 1 and 3). This cylindrical shape may be a rectangular tube of another polygonal shape or may be a cylindrical shape. In the illustrated example, the cylindrical portion is tapered toward the opening 5b. This shape is more suitable for increasing the sound pressure of the bell sound. The shape toward the opening 5b may be tapered, or may be a straight tube with no change in diameter. In either case, it is preferable that the size of the opening 5b be approximately the same as the size of the sound hole portion in the front panel of the housing (in the example shown in FIGS. 6 and 7, which will be described later, the size of the opening 5b is slightly larger than the sound hole portion 10b).

[0023] Multiple parts with the same shape In the illustrated example, the hood 5 is formed by assembling two identical parts 5A and 5A' that are divided equally in the circumferential direction (see FIG. 4). Specifically, both parts 5A and 5A' have, on both circumferential end faces, recessed parts 5e and protruding parts 5f, and recessed parts 5e' and protruding parts 5f', respectively, as fitting portions between the two parts (these fitting portions also have the same shapes (including positions) between the two parts). The recessed part 5e of one part 5A fits into the protruding part f' of the other part 5A', and the protruding part 5f of one part 5A fits into the recessed part 5e' of the other part 5A', thereby assembling them together to form the cylindrical hood 5.

[0024] By making the hood 5 out of multiple parts of the same shape, such as the two parts 5A and 5A', it is possible to use only one mold for molding the multiple parts into molded products of synthetic resin material, thereby reducing manufacturing costs. Note that the number of parts of the same shape that make up the hood 5 may be more than two, but two is more advantageous in terms of ease of assembly.

[0025] Mounting part The hood 5 has attachment portions 5d, 5d' at the end opposite the opening 5b for attachment to a mounting bracket 6 (an example of an attachment part) described below (see FIGS. 3(b) and 7). In the illustrated example, the attachment portions 5d, 5d' are provided as recesses into which the insertion portion of the mounting bracket 6 is inserted. The attachment portion 5d will be further described below together with the mounting bracket 6.

[0026] [Mounting bracket (example of mounting parts)] The alarm bell 1 further comprises a mounting bracket 6 which is used to mount the gong 2 in a predetermined position within the housing when the alarm bell 1 is to be installed housed within the housing.

[0027] The mounting bracket 6 is made of a metal plate member. In the illustrated example, it has a U-shaped cross section and includes a bottom plate 6a that is attached to a predetermined position within the housing using fastening means (such as screws) and standoffs 6b, 6b at both longitudinal ends of the bottom plate 6a (see FIG. 5). The mounting bracket 6 is attached to a predetermined position within the housing with the standoffs 6b, 6b positioned on the left and right. A receiver 6c is provided in the center of the bottom plate 6a for hooking the gong 2. The gong 2 can be attached to the bottom plate 6a with its obverse side facing forward by inserting the hook 4a of the rear-side housing 4 into the receiver 6c from above.

[0028] 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 together from either side of the width of the bottom plate 6a, sandwiching the gong 2 from above and below. The two widthwise ends of the bottom plate 6a are then inserted into the mounting sections 5d and 5d' provided on both parts, so that the cylindrical section 5a is attached to the mounting bracket 6 so as to surround the gong 2 on the bottom plate 6a (see FIG. 7).

[0029] In addition, the left and right standing pieces 6b, 6b of the mounting bracket 6 are provided to be positioned outside the hood 5 when the hood 5 is attached. The standing pieces 6b, 6b function as guards for the hood 5 located inside.

[0030] [Example of storage inside the housing] As described above, the alarm bell 1 can be installed by being housed inside a housing such as a fire hydrant box, an equipment housing box, etc. Figures 6 and 7 show, as an example, how the alarm bell 1 is housed when it is installed by being housed inside an equipment housing box.

[0031] The equipment storage box 10 is used for an automatic fire alarm system, and as shown in the figure, an alarm bell 1 is stored inside as a local sound device, and an indicator light and a transmitter (the storage part is not shown) are stored inside with parts of them (display part 10c, push button part 10d, etc.) exposed to the outside.

[0032] Specifically, as shown in Figure 7, alarm bell 1 is stored inside equipment housing box 10 with gong 2 and the hood 5 surrounding it attached and fixed with screws to a frame member provided on front panel 10a via screw holes provided in mounting bracket 6.

[0033] At this time, the hood 5 surrounds the gong 2, with the opening 5b opening toward the sound hole 10b located in front of the surface of the gong 2.

[0034] Therefore, even when the alarm bell 1 is stored inside the equipment housing box 10, the sound pressure can be increased by the hood 5, and the bell sound with increased sound pressure can be emitted outside the equipment housing box 10 through the opening 5b and the sound hole portion 10b.

[0035] Furthermore, in the illustrated example, the end of the alarm bell 1 where the opening 5b of the hood 5 is provided is close to the part of the front panel 10a where the sound hole 10b is provided. This allows the bell sound, the sound pressure of which is increased when it is emitted from the opening 5b of the hood 5, to be efficiently emitted from the sound hole 10b to the outside of the equipment housing box 10.

[0036] The end of the hood 5 where the opening 5b is provided may be in contact with the portion of the front panel 10a where the sound hole portion 10b is provided.

[0037] [Mounting fixture with detachable parts (another example of a mounting part)] The alarm bell 1 can also be installed directly on the wall of a building without being housed inside a housing. In this case, it may be installed without the hood 5. The mounting bracket 7 shown in Figure 8 is an example of a mounting part that can be suitably used when the alarm bell 1 is installed without the hood 5.

[0038] Like the mounting bracket 6, the mounting bracket 7 is made of a metal plate member and has a bottom plate portion 7a that is attached to a predetermined position within the housing by a fixing means, and standing pieces 7b, 7b provided on both ends of the length of the bottom plate portion 7a.A receiving portion 7c is provided in the center of the bottom plate portion 7a into which the hook portion 4a on the back side of the gong 2 is inserted.

[0039] 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 on this separable portion 7d.

[0040] When the separable portion 7d is not separated, the mounting bracket 7 can be used to attach the hood 5 and to hang the gong 2, just like the mounting bracket 6. If the separable portion 7d is separated, the hood 5 cannot be attached, but the gong 2 can still be hung by using the separable portion 7d as a mounting part.

[0041] In other words, when the alarm bell 1 is installed by being stored inside a housing, for example, when the alarm bell 1 is installed with the hood 5 attached, the mounting bracket 7 can be used as a mounting part for the object to be installed without separating the detachable part 7d, and when the alarm bell 1 is installed without being stored inside a housing, for example, when the alarm bell 1 is installed without the hood attached, the detachable part 7d can be separated and the separated part can be used as a mounting part for the object to be installed.

[0042] The method for forming the detachable portion 7 can be various metal processing techniques. In the illustrated example, the connecting portion 7e with the bottom plate portion 7a is cut while leaving a small portion of the connecting portion 7e, 7e, and the connecting portion 7e is thinned so that it can be easily separated. The processing method is not limited to this as long as it can be easily separated.

[0043] [Configuration change example] In the alarm bell 1, for example, the configuration can be changed as follows.

[0044] The cylindrical portion 5a of the hood 5 may be made up of multiple parts of the same shape assembled together, or may be made up of a single part formed as a single unit, instead of being made up of multiple parts of different shapes assembled together.

[0045] The hood 5 may be attached to the housing 4 instead of to the mounting brackets 6 and 7 .

[0046] The hood 5 and the mounting bracket 6 may be made as an integrated member instead of being separate members. [Explanation of symbols]

[0047] 1: Alarm bell 2: Gong 3: Mallet 4: Housing 4a: Hook 5: Hood 5A, 5A': Part 5a: Cylindrical part 5b: Opening 5c: End 5d, 5d': Mounting portion 5e, 5e': Concave portion 5f, 5f': Convex portion 6: Mounting bracket 6a: Bottom plate 6b: Standing piece 6c: Receiving part 7: Mounting bracket 7a: Bottom plate part 7b: Vertical piece part 7c: Receiving part 7d: Separable part 7e: Connection section 10: Equipment storage box 10a: Front plate 10b: Sound hole section 10c: Display section 10d: Push button section

Claims

1. An alarm bell that sounds an alarm by striking a gong, and that includes a cylindrical hood that surrounds the gong, the gong further includes an attachment part for attaching the gong to an attachment object, and the hood is attached to the attachment object together with the gong by the attachment part; The mounting part has a bottom plate portion and a detachable portion, the detachable portion being provided on the bottom plate portion and detachably connected thereto, and when the alarm bell is to be installed without the hood being attached, the detachable portion can be detached from the mounting part and used as a part for attaching the gong to an object to be attached.

2. 2. The alarm bell according to claim 1, wherein the mounting part is plate-shaped.

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