Equipment storage box

Abstract

To provide an apparatus storage box with a sound pressure enhanced more than the prior arts.SOLUTION: An apparatus storage box comprises: a box which includes an opening on a front face and in which a bell is stored; and a frame which is mounted to the box. In the apparatus storage box, the frame includes: a mounting frame which is mounted at an edge of the opening of the box; a bell mounting part which extends from the mounting frame in a depth direction of the box and is provided separately from a bottom face of the box and to which the bell is mounted; and an adjustment part which is interposed between the bell mounting part and the bell. The bell is mounted in the bell mounting part via the adjustment part.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to an equipment housing that houses a bell that produces sound. [Background technology]

[0002] There is an equipment housing box that houses a bell that sounds an alarm in the event of a fire or the like. Some such equipment housing boxes include a box with an opening on the front and a plate (hereinafter also referred to as a frame) attached to the edge of the opening of the box (see, for example, Patent Document 1). In the equipment housing box of Patent Document 1, the frame has a frame-like portion that is fixed to the box and a bell mounting portion with a U-shaped cross section that extends from the frame-like portion toward the back of the box, and the bell is directly mounted to this bell mounting portion. An emergency bell device that houses a bell in an equipment housing box is generally required to produce a sound pressure of 90 dB or more at a distance of 1 m. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-085384 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the equipment housing box of Patent Document 1, although the distance from the bell to the acoustic hole of the equipment housing box can be reduced by attaching the bell to the bell mounting part that is further forward than the bottom of the box, the bell is attached so that the entire back surface of the bell is in contact with the bell mounting part, which can cause a decrease in sound pressure by reducing the reverberation of the sound due to the bell mounting part.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an equipment housing box with improved sound pressure compared to conventional equipment housing boxes. [Means for solving the problem]

[0006] The device housing box of the present disclosure includes a box having an opening on the front and housing a bell therein, a frame attached to the box, and a door attached to the frame portion so as to be able to freely open and close the opening of the box; In an equipment housing box having the above structure, the frame portion includes a mounting frame portion attached to an edge portion of the opening of the box, and a mounting frame portion extending from the mounting frame portion in a depth direction of the box and spaced apart from a bottom surface of the box, and has a pair of frame side walls only on the left and right sides, A bell mounting portion to which the bell is attached, and a portion interposed between the bell mounting portion and the bell and rod-shaped or columnar an adjustment section, and the bell is attached to the bell attachment section via the adjustment section. The door has one or more sound holes formed in a sound hole area facing the bell when the door is closed. . [Effects of the Invention]

[0007] The device housing box of the present disclosure has an adjustment part interposed between the bell mounting part and the bell, and the bell is mounted to the bell mounting part via the adjustment part. Therefore, compared to conventional devices, the adjustment part can reduce the contact area between the bell and the bell mounting part, which increases the reverberation of the bell sound at the bell mounting part and improves sound pressure. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an exploded perspective view of an acoustic device in which a bell is mounted in an equipment housing box according to a first embodiment. [Figure 2] FIG. 2 is a front perspective view showing the appearance of the acoustic device of FIG. [Figure 3] 2 is a front view showing the acoustic device of FIG. 1 with the door open. FIG. [Figure 4] FIG. 4 is a longitudinal cross-sectional view showing the AA section of the acoustic device of FIG. [Figure 5] FIG. 2 is a front view of a door in the equipment housing box of FIG. [Figure 6] FIG. 6 is a rear perspective view of the door of FIG. 5. [Figure 7] FIG. 6 is a vertical cross-sectional view showing the cross section BB of the door in FIG. 5. [Figure 8]3 is a vertical cross-sectional view of the acoustic device of FIG. 2 at a center position in the left-right direction. [Figure 9] FIG. 2 is a rear view of the bell in the acoustic device of FIG. 1, showing the installation position of an adjustment unit. [Figure 10] 9 is a plan view of the bell, the bell mounting portion, and the adjustment portion of the acoustic device of FIG. 8, viewed from above. [Figure 11] 10 is a front perspective view showing the appearance of an acoustic device in which a bell is mounted in an equipment housing box according to a modified example of the first embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of an equipment housing box 100 according to the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to the embodiment described below. Furthermore, in the following drawings, including FIG. 1, the dimensional relationships between components may differ from those in reality. Furthermore, in the following description, terms indicating directions are used as appropriate for ease of understanding. However, these terms are for explanatory purposes and do not limit the present invention. Terms indicating directions, such as "up," "down," "right," "left," "front," and "rear," refer to directions when viewing the equipment housing box 100 shown in FIG. 2 with the door 6 facing forward (front), unless otherwise specified. In each drawing, the arrow Y direction indicates the front-to-rear direction, the arrow Z direction indicates the up-down direction, and the arrow X direction indicates the left-to-right direction. Furthermore, in each drawing, parts with the same reference numerals are the same or equivalent, and this applies throughout the entire specification.

[0010] Embodiment 1 Fig. 1 is an exploded perspective view of acoustic device 200 in which a bell 8 is mounted in equipment housing box 100 according to embodiment 1. Fig. 2 is a front perspective view showing the appearance of acoustic device 200 of Fig. 1. Fig. 3 is a front view showing acoustic device 200 of Fig. 1 with door 6 open. Fig. 4 is a vertical cross-sectional view showing cross section AA of acoustic device 200 of Fig. 3. As shown in Fig. 1, a bell 8 that generates sound is housed inside equipment housing box 100.

[0011] In the following description, it is assumed that equipment housing box 100 is equipped with bell 8, which is an emergency bell, and constitutes acoustic device 200 that notifies the user of a fire by sound in the event of a fire. Acoustic device 200 receives a fire signal from, for example, an external fire receiver, and when the fire signal is received, notifies the user of a fire by sounding bell 8. The configuration of acoustic device 200 will be described with reference to Figs. 1 to 4.

[0012] The acoustic device 200 of the first embodiment is an exposed type acoustic device 200, and is installed indoors or outdoors within a building. When the acoustic device 200 is installed indoors, the acoustic device 200 is attached to a wall surface (hereinafter referred to as the mounting surface) of a room in the building so that the entire equipment housing box 100 is exposed from the wall surface to the room.

[0013] As shown in Figures 1 and 2, equipment housing box 100 has box 1 having opening 10 on the front surface, and frame 2 attached to box 1. Frame 2 has mounting frame 3 attached to box 1, and bell mounting portion 4 to which bell 8 is attached. Equipment housing box 100 also has door 6 attached to frame 2 so that opening 10 of box 1 can be opened and closed. One or more acoustic holes 60 are formed in door 6 in an area that faces bell 8 when door 6 is closed. Hereinafter, an area of ​​door 6 where multiple acoustic holes 60 are formed may be referred to as acoustic hole area Rs (see Figure 2). Note that door 6 may have only one acoustic hole 60.

[0014] As shown in FIG. 1, device housing box 100 of the present disclosure also has adjustment portion 5 interposed between bell mounting portion 4 and bell 8.

[0015] As shown in FIG. 1 , box 1 has a rectangular parallelepiped shape with an open front, rectangular rear wall 11 facing opening 10, and cylindrical peripheral wall 12 extending forward from the outer periphery of rear wall 11. That is, the inner surface of rear wall 11 of box 1 is bottom surface 110 of box 1. Rear wall 11 is formed with mounting holes 115 into which fasteners (not shown) such as screws are inserted. The fasteners inserted into mounting holes 115 secure acoustic device 200 to the mounting surface. Rear wall 11 of box 1 also has wiring holes 116 into which wiring such as lead wires (not shown) extending from bell 8 is inserted. Drainage holes 121 penetrating peripheral wall 12 are formed in the lower part of peripheral wall 12 of box 1.

[0016] The box 1 also has an opening edge 14 that extends inward from the front end of the peripheral wall 12 to face the rear wall 11. Fixing holes 140 into which fixing devices 91 such as screws are inserted are formed at each of the four corners of the opening edge 14 of the box 1. The frame 2 is fixed to the box 1 by the fixing devices 91.

[0017] The mounting frame 3 attached to the box 1 has a frame-like shape and is fixed to the opening edge 14 of the box 1 by fasteners 91. When the frame 2 is attached to the box 1, the mounting frame 3 has a frame plate 31 that has a rectangular outer shape similar to the outer shape of the box 1 in a front view, and an outer frame 32 that stands forward from the outer periphery of the frame plate 31.

[0018] Frame plate 31 is arranged to cover opening edge 14 of box 1 in front view. Frame opening 30, which exposes bell 8, is formed in the center of frame plate 31 in front view. Frame plate 31 has extensions 310 extending inward at the vertical center (in the direction of arrow Z) of both left and right edges of frame opening 30. Frame opening 30 has a horizontal H-shape. In other words, frame opening 30 in FIG. 1 is configured so that the opening widths above and below the vertical center are larger than the opening width at the center. Bell mounting portion 4 is fixed to fixing holes 311 formed in extensions 310 using fasteners 92 such as screws. While extensions 310 in FIG. 3 preferably extend horizontally to ensure sound pressure, they may also extend vertically, i.e., frame plate 31 has both upper and lower edges of frame opening 30 extending outward.

[0019] 3, fixing holes 312 and 313 are formed in frame plate 31. Fixing device 91 shown in FIG. 1 is inserted into fixing hole 312 to fix frame 2 to box 1. Fixing device 94 is inserted into fixing hole 313 to fix door 6 in a closed state to frame 2. In the example of FIG. 3, fixing holes 312 are formed in each of the four corners of frame plate 31, and fixing hole 313 is formed in the left end of the center of frame plate 31 in the vertical direction (direction of arrow Z).

[0020] The door 6 is attached to the outer frame portion 32 of the mounting frame portion 3 by a mounting fixture 93 so as to be able to be opened and closed freely. When closed, the door 6 is disposed within the mounting frame portion 3 so as to face the frame plate portion 31, and closes the frame opening 30.

[0021] As shown in FIG. 4, the bell mounting portion 4, to which the bell 8 is attached, extends from the mounting frame 3 in the depth direction of the box 1 (rearward in the direction of arrow Y) and is spaced apart from the inner surface of the rear wall 11 of the box 1, i.e., the bottom surface 110 of the box 1. Specifically, as shown in FIG. 1, the bell mounting portion 4 has a plate-shaped frame rear wall 41 that faces the rear wall 11 of the box 1, a pair of frame fixing portions 43 that are located forward of the frame rear wall 41 and face a pair of extension portions 310 on the frame plate portion 31 of the mounting frame 3, and two frame side walls 42 that connect the frame rear wall 41 to each of the frame fixing portions 43. The bell 8 is attached to the bell mounting portion 4 via an adjustment portion 5. The bell 8 is positioned forward of the frame rear wall 41 in the front-to-rear direction (direction of arrow Y), i.e., on the door 6 side, and between the two frame side walls 42 in the left-to-right direction (direction of arrow X). In acoustic device 200 of Fig. 1, bell 8 is attached to the front surface of frame rear wall portion 41 of bell mounting portion 4 via adjustment portion 5. Similarly, each frame side wall portion 42 of bell mounting portion 4 is also provided spaced apart from peripheral wall 12 of box 1.

[0022] In this configuration, the distance between bell 8 and door 6 in the front-to-rear direction (arrow Y direction) is shorter than when bell 8 is installed on bottom surface 110 of box 1, so a decrease in sound pressure can be suppressed. Furthermore, regardless of the depth of box 1, the distance between bell 8 and door 6 in the front-to-rear direction (arrow Y direction) can be determined by bell mounting portion 4. Furthermore, because bell mounting portion 4 is a wall on the side and rear of bell 8, sound is more likely to be emitted in the forward direction.

[0023] While frame side walls 42 in Figure 1 are shown only on the left and right sides and not on the top and bottom, they may be provided only on the top and bottom sides and not on the left and right sides, or they may be provided in all directions. Surrounding bell 8 with frame side walls 42 on the top, bottom, left, and right sides makes it easier for the sound to project forward, but providing frame side walls 42 only on the left and right sides or only on the top and bottom of bell 8 reduces material and costs. The inventors tested sound pressure with a configuration in which frame side walls 42 were provided only on the left and right sides of bell 8 and found that sufficient sound pressure was achieved with this configuration, so Figure 1 illustrates a configuration in which frame side walls 42 are provided in only two directions.

[0024] 1, adjustment unit 5 is interposed between bell 8 and bell mounting unit 4, and a space G (see FIG. 8 described below) is formed between bell 8 and bell mounting unit 4 in areas other than where adjustment unit 5 is provided. Specific examples of adjustment unit 5 and the space G formed between bell 8 and bell mounting unit 4 will be described later.

[0025] 3, the relationship between the vertical width W8 (hereinafter, width W8) of bell 8 (direction of arrow Z), the vertical width W4 (hereinafter, width W4) of bell mounting portion 4, and the vertical width W30 (hereinafter, width W30) of frame opening 30 of mounting frame 3 is explained. Bell mounting portion 4 is provided only behind the vertical center of frame opening 30 of mounting frame 3. In other words, width W4 is smaller than width W30, and bell mounting portion 4 is not provided above or below the center of frame opening 30. Width W4 is approximately the same as width W8 so that frame rear wall 41 covers the rear side of the entire bell 8, including gong 81. Alternatively, width W4 may be smaller or larger than width W8, so long as frame rear wall 41 covers main body rear wall 833 (see FIG. 8, described below), which is the rearmost portion of bell 8. However, if width W4 is smaller than width W30, there is nothing covering the front of bell 8, so that sound reverberating in bell mounting portion 4 and box 1 can be emitted from frame opening 30, which is useful for improving sound pressure.

[0026] FIG. 5 is a front view of door 6 in equipment housing box 100 of FIG. 1. In FIG. 5, the outline of bell 8 projected onto door 6 is indicated by a two-dot chain circle R8, and an acoustic hole region Rs in which multiple acoustic holes 60 are provided in door 6 is indicated by a dashed line. Door 6 has a rectangular door main body 61 that covers the front of bell 8 when closed, and a door flange portion 62 that stands rearward from the outer peripheral edge of door main body 61. In the example of FIG. 5, as a structure for attaching door 6 to frame portion 2, a protrusion 65 that protrudes upward is provided at the right end of the upper part of door flange portion 62, and a mounting hole 66 (see FIG. 6 described later) into which a mounting fixture 93 (see FIG. 3) is inserted is formed at the right end of the lower part of door flange portion 62. In addition, in the examples of FIGS. 2 and 5, as a structure for fixing door 6 to frame portion 2 in a closed state, a fixing hole 67 into which a fixing fixture 94 is inserted is formed at the left end of the center in the vertical direction (direction of arrow Z) of door main body 61. As shown in Fig. 3, the door 6 rotates around the protrusion 65 and the mounting fixture 93. As shown in Figs. 2 and 3, the door 6 closes the frame opening 30 when closed, and exposes the frame opening 30 when open.

[0027] As shown in FIG. 5, multiple acoustic holes 60 are provided in the center of the door main body 61, facing the bell 8 (see FIG. 3). The shape of the acoustic hole region Rs, which is the collective shape of the acoustic holes 60, is a polygon with approximately the same area as the circle R8, indicated by the two-dot chain line, which is the projection of the bell 8 onto the door 6. The shape of the acoustic hole region Rs may also be a polygon inscribed in the circle R8. In the example of FIG. 5, the shape of the acoustic hole region Rs is a hexagon inscribed in the circle R8. Furthermore, each acoustic hole 60 has, for example, an elongated hole shape, and in the example of FIG. 5, the shape of the acoustic hole 60 is a horizontally long oval. By making the acoustic holes 60 elongated, the sound pressure is improved compared to when the acoustic holes 60 are round.

[0028] Here, the more open the door 6 is, the better the sound pressure from the acoustic device 200. Therefore, in the present disclosure, when each acoustic hole 60 is shaped like an elongated hole, the acoustic hole area Rs is arranged in a polygonal shape to increase the aperture ratio so that it follows the circle R8 that is the outline of the bell 8. Note that if the area in which the multiple acoustic holes 60 are provided or each acoustic hole 60 is made too wide in order to increase the aperture ratio, the strength of the metal plate that constitutes the door 6 will be weakened or it will become difficult to provide rainproofing measures. This is also undesirable from the standpoint of preventing vandalism, etc.

[0029] 5, the acoustic holes 60 are elongated and have the same shape and length, and are arranged in a polygonal shape in the left-right direction (direction of arrow X) at the top and bottom of the acoustic hole region Rs, with fewer holes than at the center. For example, if the acoustic holes 60 are arranged in a vertical line and the width of each hole 60 is widened to fit the shape of the bell 8, the width of each hole 60 will be wide, so it may be necessary to provide a rainproof canopy or the like. A configuration in which multiple elongated acoustic holes 60 are arranged in a polygonal shape, as in the present disclosure, is preferable because it prevents rainwater from entering the interior from above without forming a canopy or the like on the door 6.

[0030] Fig. 6 is a rear perspective view of the door 6 of Fig. 5. Fig. 7 is a vertical cross-sectional view showing the BB cross section of the door 6 of Fig. 5. As shown in Figs. 6 and 7, the equipment housing box 100 (see Fig. 3) is provided with a rainproof sheet 7 that is attached and fixed to the rear side of a flat door main body 61. By directly attaching and fixing the rainproof sheet 7 to the door main body 61, peeling or shifting of the rainproof sheet 7 can be prevented without providing a pressing member for fixing the rainproof sheet 7 to the box 1 or frame 2 side.

[0031] The rainproof sheet 7 has a sheet central portion 71 that faces the acoustic hole area Rs (see Figure 3) of the door 6, and a sheet frame portion 72 that is provided on the outside of the sheet central portion 71. The sheet central portion 71 is made of a membrane-like film that is thinner than the thickness of the sheet frame portion 72. The sheet frame portion 72 supports the outer edge of the sheet central portion 71. The rainproof sheet 7 is made of a water-impermeable material. The rainproof sheet 7 can be made, for example, by attaching a polyethylene film to urethane foam. In this case, the sheet central portion 71 is made of the center of the polyethylene film, and the sheet frame portion 72 is made of the urethane foam and the outer periphery of the polyethylene film.

[0032] In the example of Fig. 6, the seat frame portion 72 has a rectangular shape. The seat center portion 71 has the same shape as the acoustic hole area Rs of the door 6 (see Fig. 3), and in the example of Fig. 6, has a hexagonal shape. In Fig. 6, the multiple acoustic holes 60 in the acoustic hole area Rs of the door 6 that are covered by the seat center portion 71 are indicated by dashed lines.

[0033] As explained using Figures 3 and 5, the acoustic hole 60 of the door 6 is shaped like a horizontally long hole, and multiple acoustic holes 60 are arranged in a polygonal shape that follows the circle R8, which is the shape of the bell 8, so that it is possible to suppress the intrusion of rainwater and the like while maintaining sound pressure, and the rainproof sheet 7 (see Figure 6) can also prevent rainwater from invading the equipment housing box 100 (see Figure 3) through the acoustic hole 60 while maintaining sound pressure.

[0034] 7, on the sheet front surface 7a of the rainproof sheet 7 that is attached to the back surface of the door body 61, a step 73 is provided at the boundary between the sheet center portion 71 and the sheet frame portion 72 due to the difference in thickness between the sheet center portion 71 and the sheet frame portion 72. As a result, a gap Gs is formed between the sheet center portion 71 and the acoustic hole region Rs of the door 6 by the height Y73 of the step 73, i.e., the width (e.g., 3 mm) of the step 73 in the front-to-rear direction (arrow Y direction), and the sheet center portion 71 is positioned away from the back surface of the door body 61. In this case, sound pressure is improved compared to when the polyethylene film of the sheet center portion 71 is directly attached to the edge of the acoustic hole 60 of the door 6.

[0035] Since the sound pressure varies depending on the height Y73 of the step 73, it is preferable to verify and set the optimal range of the step 73 height Y73 for the acoustic device 200 in advance so that the desired sound pressure is obtained. In a test conducted by the inventors, the thickness Y7 of the rainproof sheet 7 (i.e., the thickness of the sheet frame portion 72) was set to 3 mm, and the height Y73 of the step 73 was set to approximately 3 mm (Y7 minus the thickness of the sheet center portion 71, which is approximately several tens of microns). This resulted in good results in both sound pressure and water drainage efficiency. The greater the height Y73 of the step 73, the poorer the drainage efficiency of the water spray and the greater the likelihood of debris accumulating between the sheet center portion 71 and the edge of the acoustic hole 60. The sound pressure also varies depending on the density of the urethane foam that makes up the rainproof sheet 7; the higher the density of the urethane foam, the easier it is to obtain high sound pressure.

[0036] In acoustic device 200, the shape and arrangement of acoustic holes 60 in door 6 and the rainproof sheet 7 can prevent not only the intrusion of rainwater and the like from above, but also the intrusion of rain, sand, dust, and the like from the side due to wind and rain, and the intrusion of muddy water splashed up from the ground. Therefore, acoustic device 200 of the present disclosure can be installed in harsh outdoor environments as a "rainproof type" that has rainproof performance among drip-proof acoustic devices that are generally installed outdoors.

[0037] Although the rainproof sheet 7 in Fig. 7 is impermeable to water, even if rainwater gets into the box 1 in Fig. 1 when the door 6 is opened, the water will be drained through drainage holes 121 formed in the lower part of the peripheral wall 12 of the box 1. In addition, packing is provided between the box 1 and frame 2, and between the frame 2 and the door 6, respectively, to prevent water from entering between the components.

[0038] Fig. 8 is a longitudinal cross-sectional view taken at the center position of the left and right sides of acoustic device 200 in Fig. 2. For ease of explanation, rainproof sheet 7 in Fig. 7 is omitted from Fig. 8. Fig. 9 is a rear view of bell 8 in acoustic device 200 in Fig. 1, showing the installation position of adjustment unit 5. Fig. 10 is a plan view of bell 8, bell mounting unit 4, and adjustment unit 5 in acoustic device 200 in Fig. 8, viewed from above. The configuration of bell 8, an example of the arrangement of adjustment unit 5, and space G formed between bell 8 and bell mounting unit 4 will be described with reference to Fig. 3 and Figs. 8 to 10.

[0039] As shown in FIG. 8, the bell 8 includes a gong 81 that produces a bell sound when struck, a striking rod 82 that strikes the gong 81, and a main body 83 that includes a motor (not shown) and the like that drives the striking rod 82.

[0040] Gong 81 is bowl-shaped and appears circular in front view (see FIG. 3). Gong 81 has a flat gong bottom wall 812 facing door 6, and a curved gong peripheral wall 811 that curves rearward and is provided on the outer periphery of gong bottom wall 812. A slit 810 (see FIG. 9) is formed at a predetermined position on the rear edge of gong peripheral wall 811.

[0041] Main body 83 has a housing 830 and a motor (not shown) and other components disposed within housing 830. Housing 830 has, for example, a Y-shape when viewed from the rear, as shown in Fig. 9. As shown in Fig. 8, housing 830 has a main body bottom wall 832 that faces gong bottom wall 812, a main body rear wall 833 that faces frame rear wall 41 of bell mounting part 4, and a main body peripheral wall 831 that connects main body bottom wall 832 and main body rear wall 833.

[0042] The main body 83 is positioned on the inner surface 81a side of the bowl-shaped gong 81, i.e., on the back side, and is fixed to the gong 81 by fastening the main body bottom wall 832 of the housing 830 to the gong bottom wall 812. Part of the housing 830 is positioned within the hemispherical space formed on the inner surface 81a side of the gong 81, and the remaining part of the housing 830 is exposed from the rear edge of the gong peripheral wall 811 to the frame rear wall 41 side, i.e., rearward.

[0043] A striking rod 82 is provided in the housing 830 of the main body 83, penetrating the main body peripheral wall 831. The striking rod 82 is configured to move forward and backward in the longitudinal direction of the striking rod 82 (in the example of FIG. 8, the up and down direction indicated by the arrow Z) by a motor (not shown), and strikes the inner surface 81a of the gong peripheral wall 811 when it moves forward. As shown in FIG. 9, the position of the slit 810 in the gong peripheral wall 811 relative to the position where the striking rod 82 will be placed is predetermined.

[0044] 10, adjustment unit 5 is made up of a member that connects main body rear wall 833 of main body 83 and frame rear wall 41 of bell mounting unit 4 while separating them. Specifically, adjustment unit 5 is made up of first bolt 51 of a connecting bolt system that includes first bolt 51 attached to main body rear wall 833 and second bolt 52 that penetrates frame rear wall 41 and is connected to first bolt 51.

[0045] Adjustment unit 5 is a rod- or column-shaped member whose overlapping area with bell 8 in a front view is smaller than its non-overlapping area. Adjustment unit 5 is provided only on a portion of main body rear wall 833 and functions as a spacer that separates main body rear wall 833 of bell 8 from frame rear wall 41 of bell mounting unit 4. Main body rear wall 833 and frame rear wall 41 are spaced apart from the portion of main body rear wall 833 where adjustment unit 5 is provided. While a single adjustment unit 5 is sufficient, providing multiple adjustment units 5 is preferable to minimize the contact area between adjustment unit 5 and main body rear wall 833 or frame rear wall 41 while ensuring a stable connection. In the example shown in FIG. 9 , two adjustment units 5 are provided. Adjustment unit 5 is provided in a portion of main body rear wall 833 of housing 830 where there are no structures in front of it. Furthermore, the position of adjustment unit 5 is preferably determined to ensure stability of bell 8, taking into account the center of gravity of bell 8.

[0046] 10, adjustment unit 5 is configured as a separate member from main body 83 of bell 8 and bell mounting unit 4, but adjustment unit 5 may also be a protrusion provided on main body 83 of bell 8 or bell mounting unit 4. Also, in the example of FIG. 10, adjustment unit 5 is provided between main body rear wall 833 of bell 8 and frame rear wall 41 of bell mounting unit 4, but the location of adjustment unit 5 is not limited to this position. For example, adjustment unit 5 may be configured to connect main body peripheral wall 831 of bell 8 and frame side wall 42 of bell mounting unit 4 so as to separate main body rear wall 833 of bell 8 from frame rear wall 41 of bell mounting unit 4. However, locating adjustment unit 5 behind main body 83 of bell 8 is preferable because adjustment unit 5 is less likely to obstruct sound reverberation from inner surface 81a of bell 8 (see FIG. 9).

[0047] In addition, in a configuration in which a rear convex portion 834 separate from the adjustment portion 5 is formed on the back side of the rear wall portion 833 of the main body as shown in Figure 8, depending on the protruding height of the rear convex portion 834, a hole portion 410 may be provided in the portion of the rear wall portion 41 of the frame that faces the rear convex portion 834 to prevent the rear convex portion 834 from coming into contact with the rear wall portion 41 of the frame.

[0048] 10, by separating rear frame wall portion 41 of bell mounting portion 4 rearward from bell 8 using adjustment portion 5, the contact area between bell 8 and bell mounting portion 4 can be reduced and the space behind bell 8 can be made larger, compared to when bell 8 is directly mounted so that the back surface of bell 8 is in surface contact with bell mounting portion 4. As a result, sound is more likely to reverberate between bell mounting portion 4 and door 6 (see FIG. 8), improving sound pressure.

[0049] As shown in Fig. 10, when the door 6 is closed, the bell 8 is provided so that the front surface of the bell 8 is spaced apart from the rear surface of the door body 61. In addition, in a configuration in which the rainproof sheet 7 is provided on the door 6 as shown in Fig. 7, the bell 8 is also provided so as to be spaced apart from the rainproof sheet 7.

[0050] As described above, equipment housing box 100 according to the first embodiment has box 1 which has opening 10 on the front surface and houses bell 8 therein, and frame 2 attached to box 1. Frame 2 has mounting frame 3 which is attached to the edge of opening 10 of box 1, and bell mounting portion 4 which extends from mounting frame 3 in the depth direction of box 1 (direction of arrow Y) and is spaced apart from bottom surface 110 of box 1, and to which bell 8 is attached. Equipment housing box 100 also has adjustment portion 5 interposed between bell mounting portion 4 and bell 8. Bell 8 is attached to bell mounting portion 4 via adjustment portion 5.

[0051] In this way, equipment housing box 100 has adjustment part 5 interposed between bell mounting part 4 and bell 8, and bell 8 is attached to bell mounting part 4 via adjustment part 5. Therefore, compared to conventional techniques, adjustment part 5 can reduce the contact area between bell 8 and bell mounting part 4, making it easier for sound to reverberate at bell mounting part 4 and improving sound pressure.

[0052] Adjustment unit 5 is a component that connects bell 8 and bell mounting unit 4, and bell 8 and bell mounting unit 4 do not come into contact except at the connection point of adjustment unit 5, thereby forming space G. As a result, sound from bell 8 reverberates in space G between bell 8 and bell mounting unit 4, formed by adjustment unit 5, improving sound pressure in the front.

[0053] The equipment housing box 100 also includes a door 6 attached to the frame 2 so as to open and close the opening 10 of the box 1, the door 6 having one or more acoustic holes 60 formed in an acoustic hole area Rs that faces the bell 8 when the door is closed, and a rainproof sheet 7 attached and fixed to the back side of the door 6. The rainproof sheet 7 has a sheet central portion 71 that faces the acoustic hole area Rs of the door 6 and a sheet frame portion 72 provided on the outside of the sheet central portion 71, with a step 73 provided at the boundary between the sheet central portion 71 and the sheet frame portion 72.

[0054] This allows a gap Gs to be formed between the sheet center portion 71 and the sound hole area Rs of the door 6, improving sound pressure compared to when the rainproof sheet 7 is directly attached to the sound hole area Rs.

[0055] The embodiments of the present disclosure are not limited to the above-described embodiments, and various modifications can be made. For example, the device housing box 100 may be a combined alarm device equipped with a bell 8 and an indicator light, etc. Furthermore, although the acoustic device 200 in the first embodiment is an exposed type, the acoustic device 200 may be a recessed type.

[0056] Fig. 11 is a front perspective view showing the appearance of acoustic device 200a in which bell 8 is mounted in equipment housing box 100a according to a modification of Embodiment 1. Acoustic device 200a shown in Fig. 11 is a built-in type acoustic device 200a in which box 1a of equipment housing box 100a is built into the wall of a room or the like of a building. Therefore, box 1a in built-in type acoustic device 200a has a smaller shape in a front view than box 1a in exposed type acoustic device 200 shown in Fig. 2. [Explanation of symbols]

[0057] 1 box, 1a box, 2 frame portion, 3 mounting frame portion, 4 bell mounting portion, 5 adjustment portion, 6 door, 7 rainproof sheet, 7a sheet front, 8 bell, 10 opening, 11 rear wall, 12 peripheral wall, 14 opening edge portion, 30 frame opening, 31 frame plate portion, 32 outer frame portion, 41 frame rear wall portion, 42 frame side wall portion, 43 frame fixing portion, 51 first bolt, 52 second bolt, 60 sound hole, 61 door body, 62 door flange portion, 65 protrusion, 66 mounting hole, 67 fixing hole, 71 sheet center portion, 72 sheet frame portion, 73 step, 81 gong, 81a inner surface, 82 striking rod, 83 body, 91 fixing device, 92 fixing device, 93 mounting device, 94 fixing device, 100 equipment housing box, 100a Equipment housing box, 110 bottom surface, 115 mounting hole, 116 wiring hole, 121 drain hole, 140 fixing hole, 200 acoustic device, 200a acoustic device, 310 extension portion, 311 fixing hole, 312 fixing hole, 313 fixing hole, 410 hole portion, 810 slit, 811 gong surrounding wall portion, 812 gong bottom wall portion, 830 housing, 831 main body surrounding wall portion, 832 main body bottom wall portion, 833 main body rear wall portion, 834 rear convex portion, G space, Gs gap, R8 circle, Rs acoustic hole area, Y7 thickness, Y73 height.

Claims

1. An equipment housing box having a box with an opening on the front and housing a bell inside, a frame attached to the box, and a door attached to the frame so as to be able to open and close the opening of the box, The frame portion is a mounting frame portion attached to an edge portion of the opening of the box; a bell mounting portion extending from the mounting frame portion in a depth direction of the box, spaced apart from a bottom surface of the box, and having a pair of frame side walls only on the left and right, to which the bell is attached; a rod-shaped or column-shaped adjustment portion interposed between the bell mounting portion and the bell, the bell is attached to the bell attachment portion via the adjustment portion, The door has one or more sound holes formed in a sound hole area facing the bell when the door is closed. Equipment storage box.

2. the adjustment portion is a rod-shaped or column-shaped member that connects the bell and the bell mounting portion, The bell and the bell mounting part do not come into contact with each other except at the connection part of the adjustment part, thereby forming a space between the bell and the bell mounting part. The equipment housing box according to claim 1 .

3. A rainproof sheet is attached and fixed to the back side of the door, The rainproof sheet is made of a flat film and has a sheet center portion facing the sound hole area of ​​the door and a sheet frame portion provided on the outside of the sheet center portion, and a step is provided at the boundary between the sheet center portion and the sheet frame portion. The equipment housing box according to claim 1 or 2.

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