Equipment housing box

Abstract

To provide an equipment enclosure with improved sound pressure compared to conventional designs. [Solution] The equipment housing box (100) has an opening (10) on the front and a box (1) inside which a bell (8) is housed, and a frame part (2) attached to the box, wherein the frame part (2) has a mounting frame part (3) attached to the edge of the opening of the box, and a bell mounting part (4) extending from the mounting frame part in the depth direction of the box and spaced apart from the bottom surface (110) of the box, to which the bell is attached, and the mounting frame part (3) has a frame opening (30) that exposes the bell (8), and the mounting frame part (3) has a frame plate part (31) having this frame opening.

Description

Technical Field

[0001] The present disclosure relates to an equipment housing box that houses a bell that generates sound.

Background Art

[0002] There is an equipment housing box that houses a bell for acoustic notification during a fire or the like. In such an equipment housing box, there is one that includes a box having an opening in the front surface and a plate (hereinafter also referred to as a frame portion) 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 portion has a frame-shaped portion fixed to the box and a bell attachment portion having a U-shaped cross section provided so as to extend from this frame-shaped portion toward the back side of the box, and the bell is directly attached to this bell attachment portion. In an emergency bell device configured by housing a bell in an equipment housing box, generally, it is necessary that the sound pressure at a position 1 [m] away is 90 [dB] or more.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the equipment housing box of Patent Document 1, although the bell is attached to the bell attachment portion on the front side of the bottom surface of the box so that the distance from the bell to the acoustic hole of the equipment housing box can be reduced, since the entire back surface of the bell is attached so as to contact the bell attachment portion, the reverberation of the sound may be reduced by the bell attachment portion, which may cause a decrease in sound pressure.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide an equipment housing box with improved sound pressure compared to the prior art. [Means for solving the problem]

[0006] The equipment housing box of the present disclosure comprises a box having an opening on the front and housing a bell inside, and a frame portion attached to the box, wherein the frame portion comprises a mounting frame portion attached to the edge of the opening of the box, and a bell mounting portion extending from the mounting frame portion in the depth direction of the box and spaced apart from the bottom surface of the box, and to which the bell is attached, and the mounting frame portion has a frame opening formed therein for exposing the bell, and the mounting frame portion comprises a frame plate portion having the frame opening. [Effects of the Invention]

[0007] The equipment housing of this disclosure has a frame opening formed in the mounting frame portion for exposing the bell, and the mounting frame portion includes a frame plate portion having this frame opening. Therefore, the sound pressure can be improved compared to the conventional method. [Brief explanation of the drawing]

[0008] [Figure 1] This is an exploded perspective view of an acoustic device in which a bell is mounted in an equipment housing box according to Embodiment 1. [Figure 2] Figure 1 is a front perspective view showing the external appearance of the sound device. [Figure 3] This is a front view of the sound device shown in Figure 1, with the door open. [Figure 4] Figure 3 is a longitudinal cross-sectional view showing the AA cross-section of the acoustic device. [Figure 5] Figure 1 is a front view of the door of the equipment housing box. [Figure 6] This is a perspective view of the back side of the door in Figure 5. [Figure 7] Figure 5 is a longitudinal cross-sectional view showing the BB section of the door. [Figure 8] Figure 2 is a vertical cross-sectional view of the acoustic device at the left-right center position. [Figure 9] Figure 1 is a rear view of the bell in the acoustic device, showing the installation position of the adjustment unit. [Figure 10] Figure 8 is a plan view of the bell, bell mounting section, and adjustment section of the acoustic device, viewed from above. [Figure 11] This 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 Embodiment 1. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the equipment housing box 100 according to this disclosure will be described with reference to the drawings. However, this disclosure is not limited by the embodiments described below. Also, in the following drawings, including Figure 1, the size relationships of the components may differ from those of the actual components. Furthermore, in the following description, terms indicating direction will be used as appropriate to facilitate understanding, but these are for illustrative purposes only and do not limit the present invention. For example, terms such as "up," "down," "right," "left," "front," or "back" refer to the direction when viewing the equipment housing box 100 shown in Figure 2 with the door 6 as the front (front side), unless otherwise specified. In each figure, the Y direction of the arrow indicates the front-back direction, the Z direction indicates the up-down direction, and the X direction indicates the left-right direction. Also, in each figure, components with the same reference numerals are the same or equivalent components, and this is common throughout the entire specification.

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

[0011] In the following, the equipment housing box 100 is assumed to be equipped with a bell 8, which is an emergency bell, and constitutes an audible device 200 that notifies of a fire by sound when a fire occurs. The audible device 200 receives a fire signal from, for example, an external fire alarm receiver, and when it receives a fire signal, it notifies of the fire by sounding the bell 8. The configuration of the audible device 200 will be explained based on Figures 1 to 4.

[0012] The acoustic device 200 of Embodiment 1 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 mounted on a wall surface (hereinafter referred to as the mounting surface) such that the entire equipment housing box 100 is exposed into the room from the wall surface of the room in the building.

[0013] As shown in Figures 1 and 2, the equipment housing box 100 comprises a box 1 having an opening 10 on its front, and a frame 2 attached to the box 1. The frame 2 comprises a mounting frame 3 attached to the box 1 and a bell mounting portion 4 to which the bell 8 is attached. The equipment housing box 100 also has a door 6 attached to the frame 2 so as to be able to open and close the opening 10 of the box 1. In the door 6, one or more acoustic holes 60 are formed in the area facing the bell 8 when the door 6 is closed. Hereinafter, the area in the door 6 in which multiple acoustic holes 60 are formed may be referred to as the acoustic hole area Rs (see Figure 2). Note that there may be only one acoustic hole 60 formed in the door 6.

[0014] Furthermore, as shown in Figure 1, the equipment housing box 100 of this disclosure has an adjustment section 5 interposed between the bell mounting section 4 and the bell 8.

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

[0016] Further, the box 1 has an opening edge portion 14 extending inward from the front end portion of the peripheral wall 12 so as to face the rear wall 11. Fixing holes 140 into which fixtures 91 such as screws are inserted are formed at the four corners of the opening edge portion 14 of the box 1. The box 1 is fixed to the frame portion 2 by the fixtures 91.

[0017] The mounting frame portion 3 attached to the box 1 has a frame-like shape and is fixed to the opening edge portion 14 of the box 1 by the fixtures 91. The mounting frame portion 3 has a frame plate portion 31 having a rectangular outer shape similar to the outer shape of the box 1 in a front view and an outer frame portion 32 erected forward from the outer peripheral edge of the frame plate portion 31 in a state where the frame portion 2 is attached to the box 1.

[0018] The frame plate portion 31 is provided so as to cover the opening edge portion 14 of the box 1 when viewed from the front, and a frame opening 30 is formed in the center of the frame plate portion 31 when viewed from the front, exposing the bell 8. In the frame plate portion 31, the central part in the vertical direction (arrow Z direction) of the left and right edges of the frame opening 30 has an inwardly extending extension portion 310. The frame opening 30 has a horizontal H shape. That is, in the frame opening 30 of Figure 1, the opening width above and below the central part in the vertical direction is larger than the opening width of the central part. The bell mounting portion 4 is fixed using fasteners 92 such as screws in the fixing holes 311 formed in the extension portion 310. In Figure 3, it is desirable for the extension portion 310 to extend in the left and right direction to ensure sound pressure, but it may also extend in the vertical direction, that is, the edges on both the upper and lower sides of the frame opening 30 of the frame plate portion 31 may extend.

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

[0020] A door 6 is attached to the outer frame portion 32, which forms the mounting frame portion 3, by a mounting fixture 93 so that it can be opened and closed. When closed, the door 6 is positioned inside the mounting frame portion 3 so as to face the frame plate portion 31, and closes the frame opening 30.

[0021] As shown in Figure 4, the bell mounting section 4 to which the bell 8 is attached extends from the mounting frame section 3 in the depth direction of the box 1 (rearward in the direction of arrow Y), and is provided 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 Figure 1, the bell mounting section 4 has a plate-shaped rear frame wall section 41 facing the rear wall 11 of the box 1, a pair of frame fixing sections 43 provided in front of the rear frame wall section 41 and facing a pair of extension sections 310 in the frame plate section 31 of the mounting frame section 3, and two frame side wall sections 42 connecting the rear frame wall section 41 and each frame fixing section 43. The bell 8 is attached to the bell mounting section 4 via an adjustment section 5. The bell 8 is positioned in front of the rear frame wall section 41 in the front-to-back direction (direction of arrow Y), i.e., on the side of the door 6, and between the two frame side wall sections 42 in the left-to-right direction (direction of arrow X). In the acoustic device 200 shown in Figure 1, the bell 8 is attached to the front surface of the rear wall portion 41 of the frame in the bell mounting portion 4 via the adjustment portion 5. Similarly, each frame side wall portion 42 of the bell mounting portion 4 is provided spaced apart from the peripheral wall 12 of the box 1.

[0022] In this configuration, the distance between the bell 8 and the door 6 in the front-to-back direction (arrow Y direction) is shorter compared to when the bell 8 is installed on the bottom surface 110 of the box 1, thus suppressing the decrease in sound pressure. In addition, the distance between the bell 8 and the door 6 in the front-to-back direction (arrow Y direction) can be defined by the bell mounting section 4, regardless of the depth of the box 1. Furthermore, since the bell mounting section 4 is the side and rear wall of the bell 8, sound tends to be emitted more easily in the forward direction.

[0023] In Figure 1, the frame side walls 42 are shown only on the left and right sides and not on the top and bottom, but they may also be shown only on the top and bottom and not on the left and right sides, or they may be provided in all directions: top, bottom, left, and right. Surrounding the bell 8 on all sides with the frame side walls 42 allows the sound to project more easily forward, but providing the frame side walls 42 only on the left and right sides of the bell 8 or only on the top and bottom reduces the amount of material used and thus the cost. The inventors conducted sound pressure tests with a configuration in which the frame side walls 42 were provided only on the left and right sides of the bell 8, and found that sufficient sound pressure could be secured even with this configuration. Therefore, Figure 1 illustrates a configuration in which the frame side walls 42 are provided in only two directions.

[0024] As shown in Figure 1, the adjustment section 5 is interposed between the bell 8 and the bell mounting section 4, and a space G (see Figure 8, described later) is formed between the bell 8 and the bell mounting section 4 in areas other than where the adjustment section 5 is provided. A specific example of the adjustment section 5 and the space G formed between the bell 8 and the bell mounting section 4 will be described later.

[0025] Here, using Figure 3, the relationship between the vertical width W8 (hereinafter referred to as width W8) of the bell 8, the vertical width W4 (hereinafter referred to as width W4) of the bell mounting portion 4, and the vertical width W30 (hereinafter referred to as width W30) of the frame opening 30 of the mounting frame portion 3 will be explained. The bell mounting portion 4 is provided only at the rear of the central part in the vertical direction of the frame opening 30 of the mounting frame portion 3. That is, width W4 is smaller than width W30, and the bell mounting portion 4 is not provided above or below the central part of the frame opening 30. Furthermore, width W4 is made to be approximately the same size as width W8 so that the rear frame wall portion 41 covers the back side of the entire bell 8, including the gong 81. Alternatively, width W4 may be smaller than width W8, or larger than width W8, so that the rear frame wall portion 41 covers the rearmost part of the bell 8, which is the main body rear wall portion 833 (see Figure 8 described later). However, if the width W4 is smaller than the width W30, there is nothing covering the front of the bell 8, so the sound reflected in the bell mounting section 4 and box 1 can be emitted from the frame opening 30, which is useful for improving sound pressure.

[0026] Figure 5 is a front view of the door 6 in the equipment housing box 100 of Figure 1. In Figure 5, the outline of the bell 8 projected onto the door 6 is shown by a dashed circle R8, and the acoustic hole region Rs in the door 6 where multiple acoustic holes 60 are provided is shown by a dashed line. The door 6 has a rectangular door body 61 that covers the front of the bell 8 when closed, and a door flange portion 62 that is erected rearward from the outer edge of the door body 61. In the example of Figure 5, as a structure for attaching the door 6 to the frame portion 2, a projection 65 that protrudes upward is provided at the upper right end of the door flange portion 62, and a mounting hole 66 (see Figure 6, described later) into which a mounting fixture 93 (see Figure 3) is inserted is formed at the lower right end of the door flange portion 62. In the examples of Figures 2 and 5, as a structure for fixing the door 6 to the frame portion 2 when closed, 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 (arrow Z direction) of the door body 61. As shown in Figure 3, the door 6 rotates around the projection 65 and the mounting fixture 93. Then, as shown in Figures 2 and 3, when the door 6 is closed, it closes the frame opening 30, and when it is open, it opens the frame opening 30.

[0027] As shown in Figure 5, multiple acoustic holes 60 are provided in the central part of the door body 61 facing the bell 8 (see Figure 3). The shape of the acoustic hole region Rs, which is the collective shape of the acoustic holes 60, is a polygon with an area approximately the same as the dotted circle R8 formed by projecting the bell 8 onto the door 6. The shape of the acoustic hole region Rs may also be a polygon inscribed in circle R8. In the example in Figure 5, the shape of the acoustic hole region Rs is a hexagon inscribed in circle R8. In addition, each acoustic hole 60 has, for example, an elongated shape, and in the example in Figure 5, the shape of the acoustic hole 60 is a horizontally elongated oval. By making the shape of the acoustic hole 60 an elongated shape, the sound pressure is improved compared to when the shape of the acoustic hole 60 is a round hole.

[0028] Here, the sound pressure from the acoustic device 200 is better the wider the door 6 is open. Therefore, in this disclosure, when each acoustic hole 60 is elongated, multiple acoustic holes 60 are arranged in a polygonal shape in order to increase the opening ratio so that the acoustic hole area Rs follows the circle R8 which is the outline of the bell 8. However, if the area where multiple acoustic holes 60 are provided or each acoustic hole 60 is made too wide in order to increase the opening ratio, the strength of the sheet metal constituting the door 6 will be weakened, or rainproofing measures will become difficult. Furthermore, this is undesirable from the viewpoint of preventing vandalism, etc.

[0029] In the example shown in Figure 5, multiple acoustic holes 60 of the same shape and length are arranged in a polygonal shape by placing fewer of them in the left-right direction (arrow X direction) at the top and bottom of the acoustic hole region Rs than in the central part. For example, if the acoustic holes 60 are arranged in a single row vertically to conform to the shape of the bell 8, and the width of each acoustic hole 60 is widened, the width of each acoustic hole 60 will be wider, so it may be necessary to provide a canopy or the like for rain protection. However, the configuration in which multiple horizontally elongated acoustic holes 60 are arranged in a polygonal shape as described in this disclosure is preferable because it prevents rainwater from entering the interior from above without the need to form a canopy or the like on the door 6.

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

[0031] The rainproof sheet 7 has a central sheet portion 71 facing the acoustic hole area Rs (see Figure 3) of the door 6, and a sheet frame portion 72 provided on the outside of the central sheet portion 71. The central sheet portion 71 is made of a thin film that is thinner than the thickness of the sheet frame portion 72. The sheet frame portion 72 supports the outer edge of the central sheet portion 71. The rainproof sheet 7 is made of a material that does not allow water to pass through. The rainproof sheet 7 can be made, for example, by attaching a polyethylene film to foamed urethane. In this case, the central sheet portion 71 is made of the central part of the polyethylene film, and the sheet frame portion 72 is made of foamed urethane and the outer periphery of the polyethylene film.

[0032] In the example shown in Figure 6, the sheet frame portion 72 is rectangular. The central portion 71 of the sheet has the same shape as the acoustic hole region Rs of the door 6 (see Figure 3), and in the example shown in Figure 6, it is hexagonal. In Figure 6, the multiple acoustic holes 60 in the acoustic hole region Rs of the door 6, which are covered by the central portion 71 of the sheet, are shown by dashed lines.

[0033] As explained using Figures 3 and 5, by making the acoustic holes 60 of the door 6 horizontally elongated and arranging multiple acoustic holes 60 in a polygonal shape along the circle R8 which is the shape of the bell 8, it is possible to suppress the intrusion of rainwater, etc., while ensuring sound pressure. Furthermore, the rainproof sheet 7 (see Figure 6) also prevents rainwater from entering the equipment housing box 100 (see Figure 3) through the acoustic holes 60, while ensuring sound pressure.

[0034] Furthermore, as shown in Figure 7, on the front surface 7a of the rainproof sheet 7 that is attached to the back 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 area Rs of the door 6 by the height Y73 of the step 73, i.e., the width (for example, 3 [mm]) of the step 73 in the front-to-back direction (arrow Y direction), and the sheet center portion 71 is positioned away from the back of the door body 61. In this case, the sound pressure is improved compared to the case where the polyethylene film, which is the sheet center portion 71, is directly attached to the edge of the acoustic hole 60 of the door 6.

[0035] Furthermore, since the sound pressure changes depending on the height Y73 of the step 73, it is preferable to verify and set in advance the optimal range of the step height Y73 in the sound device 200 so that the desired sound pressure can be obtained. In verification by the inventors, when 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], which is the thickness of the central portion 71 of the sheet, which is several tens of micrometers [mm] from the thickness Y7, good results were obtained for both sound pressure and water drainage efficiency. The larger the height Y73 of the step 73, the worse the water drainage efficiency of the water spray, and the more likely debris is to accumulate between the central portion 71 of the sheet and the edge of the sound hole 60. In addition, the density of the foamed urethane that makes up the rainproof sheet 7 also causes differences in sound pressure, and it is easier to obtain higher sound pressure when the density of the foamed urethane is higher.

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

[0037] Although the rainproof sheet 7 in Figure 7 is waterproof, even if rainwater enters the box 1 in Figure 1 when, for example, the door 6 is opened, it will be drained through the drainage holes 121 formed at the bottom of the peripheral wall 12 of the box 1. In addition, gaskets are provided between the box 1 and the frame 2, and between the frame 2 and the door 6, to prevent water from entering through the gaps between the components.

[0038] Figure 8 is a vertical cross-sectional view of the acoustic device 200 in Figure 2 at the left-right center position. In Figure 8, the rainproof sheet 7 in Figure 7 is omitted from the illustration for ease of explanation. Figure 9 is a rear view of the bell 8 in the acoustic device 200 in Figure 1, showing the installation position of the adjustment unit 5. Figure 10 is a top view of the bell 8, bell mounting unit 4, and adjustment unit 5 in the acoustic device 200 in Figure 8, viewed from above. Based on Figures 3 and 8 to 10, the configuration of the bell 8, an example of the arrangement of the adjustment unit 5, and the space G formed between the bell 8 and the bell mounting unit 4 will be explained.

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

[0040] The gong 81 has a bowl-like shape and appears circular when viewed from the front (see Figure 3). The gong 81 has a flat gong bottom wall portion 812 facing the door 6 and a curved gong peripheral wall portion 811 that curves backward and is provided on the outer circumference of the gong bottom wall portion 812. A slit 810 (see Figure 9) is formed at a predetermined position on the rear edge of the gong peripheral wall portion 811.

[0041] The main body 83 includes a housing 830 and a motor (not shown) located inside the housing 830. The housing 830 has a Y-shape when viewed from the rear, as shown in Figure 9, for example. As shown in Figure 8, the housing 830 has a main body bottom wall portion 832 facing the gong bottom wall portion 812, a main body rear wall portion 833 facing the frame rear wall portion 41 of the bell mounting portion 4, and a main body peripheral wall portion 831 connecting the main body bottom wall portion 832 and the main body rear wall portion 833.

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

[0043] Furthermore, a striking rod 82 is provided in the housing 830 of the main body 83, penetrating the main body peripheral wall portion 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 Figure 8, the vertical direction indicated by the arrow Z), by a motor (not shown), and when it moves forward, it strikes the inner surface 81a of the gong peripheral wall portion 811. As shown in Figure 9, the position where the slit 810 is provided in the gong peripheral wall portion 811 relative to the position where the striking rod 82 strikes is predetermined.

[0044] In the example shown in Figure 10, the adjustment section 5 is composed of a member that connects the rear wall portion 833 of the main body 83 and the rear frame wall portion 41 of the bell mounting section 4 while separating them. Specifically, the adjustment section 5 is composed of the first bolt 51 of a connecting bolt which is made up of a first bolt 51 attached to the rear wall portion 833 of the main body and a second bolt 52 that passes through the rear frame wall portion 41 and is connected to the first bolt 51.

[0045] The adjustment part 5 is a rod-shaped or columnar member, and when viewed from the front, the area that overlaps with the bell 8 is smaller than the area that does not overlap. That is, the adjustment part 5 is provided only on a part of the main body rear wall 833 and is a spacer that separates the main body rear wall 833 of the bell 8 from the frame rear wall 41 of the bell mounting part 4. In the part of the main body rear wall 833 other than the part where the adjustment part 5 is provided, the main body rear wall 833 and the frame rear wall 41 are separated. There may be only one adjustment part 5, but it is preferable to provide multiple adjustment parts 5 in order to provide a stable connection while minimizing the contact area between the adjustment part 5 and the main body rear wall 833 or the frame rear wall 41. In the example in Figure 9, two adjustment parts 5 are provided. The adjustment part 5 is provided on the main body rear wall 833 of the housing 830 in a part where there is no structure in front of it. Furthermore, it is desirable to determine the position of the adjustment part 5 in a way that stabilizes the bell 8, taking into account the center of gravity of the bell 8.

[0046] In the example shown in Figure 10, the adjustment section 5 is made of a separate component from the main body 83 of the bell 8 and the bell mounting section 4. However, the adjustment section 5 may also be a projection provided on the main body 83 of the bell 8 or the bell mounting section 4. Also, in the example shown in Figure 10, the adjustment section 5 is provided between the rear wall portion 833 of the main body of the bell 8 and the rear frame wall portion 41 of the bell mounting section 4. However, the position in which the adjustment section 5 is provided is not limited to this position. For example, the adjustment section 5 may be configured to connect the peripheral wall portion 831 of the main body of the bell 8 and the frame side wall portion 42 of the bell mounting section 4 so as to separate the rear wall portion 833 of the main body of the bell 8 and the rear frame wall portion 41 of the bell mounting section 4. However, it is preferable to position the adjustment section 5 behind the main body 83 of the bell 8, as this makes it less likely for the sound reflection from the inner surface 81a (see Figure 9) of the bell 8 to be obstructed by the adjustment section 5.

[0047] Furthermore, in the configuration shown in Figure 8, where a rear projection 834 separate from the adjustment portion 5 is formed on the rear side of the main body rear wall portion 833, depending on the protrusion height of the rear projection 834, a hole 410 may be provided in the portion of the frame rear wall portion 41 that faces the rear projection 834 in order to avoid the rear projection 834 coming into contact with the frame rear wall portion 41.

[0048] As shown in Figure 10, by interposing the adjustment part 5 to move the rear wall portion 41 of the frame of the bell mounting part 4 backward from the bell 8, the contact area between the bell 8 and the bell mounting part 4 can be reduced and the space behind the bell 8 can be widened compared to the case where the bell 8 is directly mounted so that the back surface of the bell 8 is in surface contact with the bell mounting part 4. Therefore, sound reverberates more easily between the bell mounting part 4 and the door 6 (see Figure 8), and the sound pressure is improved.

[0049] As shown in Figure 10, with the door 6 closed, the bell 8 is positioned so that its front surface is spaced apart from the back surface of the door body 61. Also, in the configuration shown in Figure 7, where a rainproof sheet 7 is provided on the door 6, the bell 8 is positioned so as to be spaced apart from the rainproof sheet 7 as well.

[0050] As described above, the equipment housing box 100 according to Embodiment 1 comprises a box 1 having an opening 10 on its front and housing a bell 8 inside, and a frame portion 2 attached to the box 1. The frame portion 2 comprises a mounting frame portion 3 attached to the edge of the opening 10 of the box 1, and a bell mounting portion 4 extending from the mounting frame portion 3 in the depth direction (arrow Y direction) of the box 1, spaced apart from the bottom surface 110 of the box 1, and to which the bell 8 is attached. The equipment housing box 100 also has an adjustment portion 5 interposed between the bell mounting portion 4 and the bell 8. The bell 8 is attached to the bell mounting portion 4 via the adjustment portion 5.

[0051] Thus, the equipment housing 100 has an adjustment section 5 interposed between the bell mounting section 4 and the bell 8, and the bell 8 is attached to the bell mounting section 4 via the adjustment section 5. Therefore, compared to the conventional design, the adjustment section 5 reduces the contact area between the bell 8 and the bell mounting section 4, making it easier for sound to resonate at the bell mounting section 4 and improving the sound pressure.

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

[0053] Furthermore, the equipment housing box 100 includes a door 6 attached to a frame 2 so as to be able to open and close the opening 10 of the box 1, and having one or more acoustic holes 60 formed in the acoustic hole area Rs facing the bell 8 when 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 facing 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 central part 71 of the sheet and the acoustic hole area Rs of the door 6, resulting in improved sound pressure compared to when the rainproof sheet 7 is directly attached to the acoustic hole area Rs.

[0055] It should be noted that the embodiments of this disclosure are not limited to the embodiments described above, and various modifications can be made. For example, the equipment housing box 100 may constitute a composite alarm device equipped with a bell 8 and indicator lights, etc. Also, although the sound device 200 in Embodiment 1 was exposed, the sound device 200 may be embedded.

[0056] Figure 11 is a front perspective view showing the appearance of an acoustic device 200a in which a bell 8 is mounted in an equipment housing box 100a according to a modified example of Embodiment 1. The acoustic device 200a shown in Figure 11 is a recessed type acoustic device 200a in which the box 1a of the equipment housing box 100a is embedded in the wall of a room or the like in a building. Therefore, the box 1a in the recessed type acoustic device 200a has a smaller front view shape compared to the box 1 in the exposed type acoustic device 200 shown in Figure 2. [Explanation of Symbols]

[0057] 1 Box, 1a Box, 2 Frame section, 3 Mounting frame section, 4 Bell mounting section, 5 Adjustment section, 6 Door, 7 Rainproof sheet, 7a Front of sheet, 8 Bell, 10 Opening, 11 Rear wall, 12 Surrounding wall, 14 Opening edge, 30 Frame opening, 31 Frame plate section, 32 Outer frame section, 41 Rear frame wall section, 42 Side frame wall section, 43 Frame fixing section, 51 First bolt, 52 Second bolt, 60 Acoustic hole, 61 Door body, 62 Door flange section, 65 Projection, 66 Mounting hole, 67 Fixing hole, 71 Center of sheet, 72 Sheet frame section, 73 Step, 81 Gong, 81a Inner surface, 82 Striking rod, 83 Main body, 91 Fixing device, 92 Fixing device, 93 Mounting device, 94 Fixing device, 100 Equipment housing box, 100a Equipment housing, 110 bottom surface, 115 mounting hole, 116 wiring hole, 121 drain hole, 140 fixing hole, 200 acoustic device, 200a acoustic device, 310 extension, 311 fixing hole, 312 fixing hole, 313 fixing hole, 410 hole section, 810 slit, 811 gong peripheral wall section, 812 gong bottom wall section, 830 housing, 831 main body peripheral wall section, 832 main body bottom wall section, 833 main body rear wall section, 834 rear protrusion, G space, Gs gap, R8 circle, Rs acoustic hole area, Y7 thickness, Y73 height.

Claims

1. An equipment housing box having an opening on the front and containing a bell, and a frame attached to the box, The aforementioned frame portion is A mounting frame portion attached to the edge of the opening of the box, It has a bell mounting portion that extends from the mounting frame portion in the depth direction of the box, is provided at a distance from the bottom surface of the box, and to which the bell is attached, The mounting frame portion has a frame opening formed therein, which exposes the bell. The equipment housing box is characterized in that the mounting frame portion comprises a frame plate portion having the frame opening.

2. The aforementioned frame opening is When the frame and the box are viewed from the front, the opening width of the frame opening that does not overlap with the bell mounting portion but overlaps with the bottom surface of the box is larger than the opening width of the frame opening that overlaps with the bell mounting portion. The equipment housing box according to claim 1.

3. The bell mounting portion has a pair of frame side walls only on the left and right sides or only on the top and bottom sides. The aforementioned frame opening is In the left-right and up-down directions, in the open direction where the pair of frame side walls are not provided, the opening width at both ends in the open direction is greater than the opening width at the central part which overlaps with the bell mounting portion. The equipment housing box according to claim 2.

4. The bell mounting portion is, When the bell mounting portion and the bell are viewed from the front, the width of the rear wall portion of the bell mounting portion in the opening direction is the same as or smaller than the width of the bell in the opening direction. The equipment housing box according to claim 3.

5. An adjustment part is interposed between the bell mounting part and the bell, The bell is attached to the bell mounting portion via the adjustment portion. An equipment housing box according to any one of claims 1 to 4.

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