JP2000295684A - Mount structure of net for speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mount structure of net for a speaker where the appearance is improved while avoiding rattle and assembling and decomposition are facilitated without the need for a facility for welding and adhesion or the like. SOLUTION: A claw 7 is projected downward from a circumferential part 4a of a network 4, a groove 6a is formed to a part of an upper case 6 opposite to the circumferential part 4a, and the groove 6a is formed with a through-hole 6b through which the claw 7 is penetrated. Interposing an elastic member 5 between the circumferential part 4a and the groove 6a assembles the net 4. Since the claw 7 is penetrated through the through-hole 6b of the upper case 6 in the assembled state, the projected part of the claw 7 projected form the through-hole 6b is twisted to deform the projected part of the claw 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a speaker net, and more particularly to a mounting structure for a speaker net used in electronic musical instruments and the like.

[0002]

2. Description of the Related Art As a conventional structure for mounting a speaker net in a device such as an electronic musical instrument, a peripheral portion of the speaker net is welded and fixed inside a speaker case of the electronic musical instrument or the like. In another conventional mounting structure for a speaker net, a fixing piece (claw) is protruded from a peripheral portion of the speaker net, and this is penetrated through a speaker case, bent, and then bonded to the bent portion. An agent is applied to fix the speaker net. Still another conventional technique is disclosed in Japanese Patent Laid-Open No. 2-158.
As shown in FIG. 800, an elastic body is interposed between the upper case and the lower case of the speaker net integrated type.

[0003]

However, the above-mentioned conventional structure for mounting a speaker net requires equipment and a process for welding and bonding, and it is difficult to remove welding and bonding parts, so that recycling is not possible. Also, there is a problem that disassembly for disposal and disposal is not easy and workability is poor. Further, in the other conventional speaker net mounting structure, it is inconvenient that foreign matter such as an adhesive adheres to the components when recycling or discarding the components. Further, in a portion of the peripheral portion of the speaker net where there is no fixing piece, the peripheral portion is not fixed, and if the clearance with the case is not sufficient, chattering is likely to occur. If the clearance is sufficiently taken to make it difficult to adhere, not only the aesthetic appearance is impaired, but also foreign matter may inadvertently enter the case from the clearance portion. Therefore, in order to avoid this, Japanese Patent Laid-Open No.
In 8800, the clearance is provided in a case, and furthermore, an elastic body is pressed against the clearance to substantially eliminate the clearance, thereby preventing sound leakage in an undesired direction. Sound transmission to the air.

However, according to this conventional technique, not only the structure is complicated and the assembling becomes difficult, but also the periphery of the elastic body, which is liable to cause chattering, cannot be seen at the time of assembling. There was a problem that the workability of the work of redoing if it was not possible would be significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to improve appearance while avoiding chattering, and to require facilities for welding and bonding. Another object of the present invention is to provide a speaker net mounting structure that can be easily assembled and disassembled.

[0006]

According to a first aspect of the present invention, there is provided a speaker net mounting structure comprising: a speaker net having at least two protrusions projecting from a peripheral edge; A case in which at least two locking portions are provided in the groove portion, and at least one elastic body fitted in the groove portion, wherein the projection of the speaker net is locked to the locking portion of the case; At the time of locking, the peripheral edge of the speaker net is configured to press against the open end surface of the elastic body.

With this configuration, the speaker net is locked to the upper case in a state where the peripheral edge of the net is pressed against the open end face of the elastic body. That is, after the net is assembled into the upper case, the elastic body is interposed between the net and the upper case, so that chattering is prevented. Further, the position and height of the speaker net in the horizontal direction are regulated by the thickness of the elastic body, so that the appearance can be improved.

Accordingly, the appearance can be improved while avoiding chattering, and the assembling and disassembling can be facilitated without requiring facilities such as welding and bonding. In addition, since there are at least two locking portions each including the projection and the locking hole, the pressing of the peripheral portion to the open end surface is uniquely determined, so that the peripheral portion comes into contact with both side walls of the groove. Since the width of the groove can be made smaller to the extent that it does not occur, the beauty is not impaired.

The protrusions and the locking holes may be provided in an appropriate number of two or more. In such a case, the workability is improved by disposing an elastic body between the protrusions. The number, length, and position of the elastic bodies may be set so that the speaker net can be stably supported. Further, one pair of the two projections and the locking portion is formed of a hook-shaped projection and a locking hole, and after the other pair is fitted, each abutting portion (the net peripheral portion and the elastic body open end surface) is formed. The above-described operation and effect can be achieved with a configuration in which crimping is performed (for example, torsion crimping after penetrating a projection through a hole). Furthermore, in order for one elastic body to make contact with substantially the entire circumference of the net, a through hole narrower than the width is formed at the center between the elastic body having the same width as the groove and the groove, and the protrusion is fitted. By locking, the net and the case can be evenly and elastically contacted with only one elastic body.

In order to achieve the same object, the present invention provides a method according to claim 2 of the present invention.
The speaker net mounting structure of the speaker net having at least two protrusions projecting from the peripheral edge,
A case provided with a groove and provided with at least two through-locking holes in the groove; and at least one elastic body fitted into the groove, wherein a projection of the speaker net penetrates through the locking hole of the case. At the same time, the at least one protrusion is deformed after being locked through the locking hole of the case so that the peripheral edge of the speaker net presses the open end face of the elastic body at the time of locking. A speaker net is provided.

According to this structure, the protrusion of the speaker net is penetrated through the locking hole, and the protrusion is locked only by deforming the penetrated portion, so that the structure of the locking portion is simplified.

According to a third aspect of the present invention, there is provided a speaker net mounting structure according to the third aspect of the present invention, wherein the groove has a predetermined width in a longitudinal direction thereof. The stop hole is provided at the bottom of the groove, and is provided at a central portion having a predetermined distance from both side walls of the groove,
It is characterized in that the at least one projection is configured to fit into the locking hole.

According to this configuration, the net can be more accurately attached to the upper case, and in particular, the gap between the peripheral portion and the upper case (the groove width interval formed between the two) can be kept constant. I can do it. The beauty is not impaired more than the configuration of the second aspect.

In order to achieve the same object, the present invention is applied to claim 4.
The mounting structure for a speaker net according to any one of claims 2 and 3, wherein a distance between the groove longitudinal direction of the protrusion and a groove longitudinal direction distance of the locking hole is related to the protrusion. It is characterized in that it is configured to have substantially the same length so that it can be fitted with the stop hole.

With this configuration, the net can be more accurately attached to the case as compared with the configuration of the third aspect of the present invention.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is an external view of an electronic musical instrument main body to which a speaker net mounting structure according to a first embodiment of the present invention is applied. The electronic musical instrument body 1 is a keyboard musical instrument having left and right speaker units 2, and each speaker unit 2 is provided with a speaker net mounting structure according to the present embodiment.

FIG. 2 is a partial perspective view of the upper case 6.
FIG. 3 is a perspective view of the speaker net 4 as viewed from the back side. The upper case 6 and the net 4 shown in FIGS. 2 and 3 are both components of the speaker unit 2 on the right side of the electronic musical instrument main body 1 shown in FIG. The left speaker unit 2 is similarly configured.

FIG. 4 shows the upper case 6 along the line AA in FIG.
FIG. 3 is an exploded cross-sectional view (a cross-sectional view taken along the line AA) of the partial cross-sectional view of FIG. As will be described later, the net 4 is assembled to the upper case 6 via the elastic body 5.

The net 4 is made of metal, and is formed in a four semicircular fan shape as shown in FIGS. 3 and 4, and the peripheral edge portion 4a is bent at a substantially right angle over the entire circumference. 2 of the peripheral part 4a
Two on each side and arc, a total of six claws 7a
To 7f (projection). Each of the claws 7 has a rectangular plate shape and protrudes downward (FIG. 4) from the peripheral edge portion 4a.
And are formed integrally. The thickness of each claw 7 is substantially the same as the thickness of the net 4.

As shown in FIG. 2 and FIG.
A U-shaped groove 6a composed of both side walls and a bottom surface 6c connected thereto is formed in a portion of the upper case 6 opposed to the peripheral edge portion 4a. The U-shaped groove 6a has a net 4 on its bottom surface 6c.
Is provided with a through-locking hole 6b (locking portion) through which the claw 7 can pass. This locking hole 6b is formed in the groove bottom surface 6c.
The locking hole 6b is provided at a central portion having a predetermined distance W1 from both side walls of the groove, and a total of six locking holes 6b are formed at appropriate positions on the bottom surface 6c of the U-shaped groove 6a corresponding to each claw 7 of the net 4. Has been established. The claw 7 corresponding to the projection is configured to fit into the locking hole.

The elastic members 5 are made of an elastic material such as silicon rubber or polon, and a total of three elastic members 5 are provided corresponding to the two sides and the arc portion of the peripheral portion 4a. Each elastic body 5, when fitted into the groove, has two side surfaces 5a and 5b facing or contacting both side walls of the groove and a lower surface 5c contacting the bottom of the groove.
It has a rectangular cross section composed of an open end face 5d facing the periphery of the net. The length of each elastic body 5 in the longitudinal direction is set so as to fit between two adjacent claws 7 (for example, between the claws 7a and 7b) provided on the peripheral portion 4a of the net 4. .

A method of assembling the net 4 to the upper case 6 in the speaker net mounting structure of the present embodiment having the above configuration will be described below.

FIG. 5 is a sectional view taken along the line AA in FIG. 2 and is a partial sectional view showing a state in which the net 4 is assembled to the upper case 6.

First, the elastic body 5 is fitted into the groove 6a of the upper case 6 and assembled. After the fitting, the peripheral edge 4a (lower surface) of the net 4 is brought into contact with the open end face 5d of the elastic body 5,
At the time of this contact, the projection (claw 7) is made to penetrate through the locking hole 6b. That is, between the adjacent claws 7 provided on the peripheral portion 4a of the net 4 (between the claws 7a and 7b, between the claws 7c and 7d,
The peripheral portion 4a is brought into contact with the open end face 5d of each elastic body 5 between the claw 7e and the claw 7d). Since each of the claws 7 penetrates through each of the locking holes 6b of the upper case 6, the portion projecting downward from the upper case 6 is twisted and deformed with pliers or the like. The force in the twisting direction during this twisting is converted into a force that brings the net closer to the case. Thereby, the claw 7 functions as a stopper for the net 4.

According to the first embodiment, the net 4 is brought into contact with the elastic body 5 fitted in the groove 6a of the upper case, the claw 7 is projected from the locking hole, and the claw 7 is twisted in that state. Is completed. No special equipment is required for assembling or disassembling, such as welding or bonding, and workability is good.

The position of the net 4 relative to the upper case 6 in the horizontal direction is determined by the claw 7 and the corresponding locking hole 6b.
And the relative position in the vertical direction is defined by the thickness in the vertical direction of the elastic member, so that the height of the net 4 is stable and uniform, and the clearance between the net 4 and the upper case 6 is substantially equal. It becomes uniform and the appearance can be favorably maintained. Also, the peripheral portion 4a of the net 4
Is separated from the upper case 6 by an amount corresponding to the thickness of the elastic body 5 in the vertical direction, and the upper case and the net are abutted and fixed in a slightly pressed state in a separated state, As a result, occurrence of chatter in the portion is prevented. Moreover, since the number of the claws 7 may be set to the minimum number for retaining, the assemblability does not deteriorate.

Further, even when recycling or disposing of parts, foreign matters such as adhesives do not adhere, which is convenient for sorting. Further, since the elastic body 5 is fitted into the U-shaped groove 6a at a portion of the net 4 where the claw 7 is not provided, that is, at a portion other than the through hole 6b of the upper case 6, the claw 7 can be penetrated so that the elastic body 5 can be penetrated. There is no restriction on the shape such as formation. Therefore, when the net 4 is configured to be locked to the upper case 6, the design of the claw 7 is facilitated.

Therefore, the appearance can be improved while avoiding chattering, and the assembling and disassembling can be facilitated without requiring any equipment for welding or bonding. (Second Embodiment) FIG. 6 is a diagram showing a characteristic portion of the second embodiment. FIG. 6A is an exploded view showing a state before the net 4 is assembled to the upper case 6. FIG. 4 is a side cross-sectional view, in which the upper case 6 shows only an end face of the cross section.
That is, FIG. 2 shows a cross section taken along the line BB, and FIG. 3 shows a cross section taken along the line bb. FIG. 6B is a bottom view of the same, and shows a view taken along the line cc in FIG. The second embodiment is different from the first embodiment in that the claws 7 of the net 4 are replaced with bifurcated claws 27. Other configurations are the same as those of the first embodiment.

The claw 27 is provided with the claw 7 in the first embodiment.
It is provided at the same position as. FIG. 6B shows a state in which the claws 27 are passed through the through holes 6 b of the upper case 6.
The claw 27 is formed bifurcated, and the hook 27
a and 27b.

In order to lock the claw 27 in the through hole 6b, after the claw has passed through the through hole 6b, the forked hook portions 27a, 27
Insert the tip of a flathead screwdriver MD between b and pry to deform the tip. The force in the direction of squeezing is converted into a force that brings the net closer to the case.
As a result, the hooks 27a and 27b are somewhat pressed into contact with the edge of the opening on the lower side of the through hole 6b and locked, so that the claw 27 functions as a stopper.

The fitting relationship between the peripheral portion 4a of the net 4, the elastic body 5 and the upper case 6 is exactly the same as in the first embodiment.

According to this embodiment, the same effects as those of the first embodiment can be obtained, and in addition, the net 4 can be pressed and fixed to the upper case with a simple tool such as a flathead screwdriver. I can do it.

(Third Embodiment) FIG. 7 is a view showing a characteristic portion of the third embodiment, and is an exploded sectional view showing a state before the net 4 is assembled to the upper case 6. The upper case 6 is indicated by hatching. That is, FIG. 7 shows a cross section taken along line DD in FIG. 2, and FIG. 3 shows a cross section taken along line dd in FIG. However, FIG. 7 differs from FIG. 2 in the detailed structure. FIG.
Is different from the first embodiment in that the upper case 6
Is provided with a ridge 6c provided on both sides in the longitudinal direction of the groove of the locking hole 6b formed in the first groove 6a. The protruding strip 6c may be provided only at the center of the groove, or may be provided over the entire width of the groove. The length in the groove longitudinal direction may be arbitrarily set, and the protruding length is set to be slightly smaller than the distance (thickness) between the open end face 5 d and the lower face 5 c of the elastic body 5. Note that the elastic body 5 is represented by a dashed line, and the dotted line represents the upper end side 6d of the first groove 6a.

In the embodiment thus constructed, the claws 7
c and 7d pass through the locking hole 6b and the upper case 6 and the net 4
And the tip of the claw is twisted to complete the attachment of the net to the case. In this case, elastic deformation of the elastic body 5 is caused by torsion of the tip of the claw, and the deformation ends at the time when each ridge 6c comes into contact with the peripheral portion 4a of the net at the maximum. That is, the vertical positioning of the net with respect to the upper case 6 is performed by the ridge 6c. In FIG. 6, the elastic body indicating a non-deformed state is indicated by an alternate long and short dash line, and the elastic body indicating a deformed state is indicated by a dotted line. Even if the tip of the claw is twisted loosely so that the contact does not occur, the elastic body is held between the upper case 6 and the net 4, so that the net 4 does not rattle. The above positioning accuracy also
It falls within the range of the dimension d1 between the alternate long and short dash line and the dotted line, and does not exceed this. Further, in the case of disposing the elastic body 5 on the upper case before the net 4 is attached to the upper case 6, simply placing the elastic body 5 in the groove 6a in a rough manner allows both of the upper case and the elastic body. Positioning (longitudinal direction and short direction) is performed by the ridge 6c.

In FIG. 7, one side (the left side of the figure) of the claw 7c is formed in a tapered shape (illustrated by a dotted line), and the thickest portion thereof and the outer opening of the locking hole 6b (the upper side of the figure). Or the thickest part is slightly larger. That is, the length of the protrusion (claw) in the groove longitudinal direction and the distance of the locking hole in the groove longitudinal direction are configured to be substantially the same length to the extent that the protrusion and the locking hole can be fitted. Thus, the horizontal positioning of the net with respect to the upper case can be reliably performed. At least one such positioning claw per net
It may be provided at each location. The other pawls 7d and the like other than the positioning pawls are easier to work in terms of workability if a slight clearance is provided between the pawls 7d and the locking holes in the longitudinal direction of the groove. Note that there may be a slight clearance between the claw 7c and the locking portion in the groove width direction. Positioning in the groove width direction is performed in the same manner as in the first embodiment by positioning the locking hole at a substantially central portion of the groove width as a locking hole smaller than the groove width, thereby performing positioning in the groove width direction. I have.

(Fourth Embodiment) FIG. 8 is an exploded perspective view of a net and an elastic body according to a fourth embodiment.
In the fourth embodiment, the configuration of the elastic body is different from that of the first embodiment, and the other configuration is the same as that of the first embodiment.

The elastic members 45 are set to be longer than the elastic members 5 in the first embodiment, and each elastic member 45 is provided with a slit 45b. The slit 45 b is a hole that penetrates from the open end face to the bottom face, and is provided at a position corresponding to the claw 7 of the net 4.

The elastic body 45 is provided on the periphery 4 of the net 4.
Although it is provided corresponding to the two side portions and the arc portion of a, it may be configured as a single member over the entire periphery of the peripheral portion 4a.

To attach the net 4 to the upper case 6,
With the elastic body 45 placed in the groove 6a, the claw 7
Through the slit 45b of the elastic body 45. In this state, the pawl 7 is fitted into the locking hole, and the portion penetrating from the slit 45b of the pawl 7 is twisted and deformed to complete the assembly.

According to the present embodiment, the same effect as that of the first embodiment can be obtained except that the design of the claw 7 is easy, and the length of the elastic body 45 can be freely set. Since the degree is obtained, the design of the elastic body 45 becomes easy.

(Fifth Embodiment) FIG. 9 is a net diagram according to a fifth embodiment. FIG. 9 (a) is a perspective view of the net as viewed from the back, and FIG. 9 is a partial perspective view of the upper case, and FIG. 9C is a partial view of an AA cross section.
In the fifth embodiment, the locking of the net to the upper case is as simple as possible. The locking portions of both are different from those of the first embodiment, and the other configurations are the same as those of the first embodiment. This is the same as the embodiment.

The two projections 7g and 7h projecting from the peripheral edge 4a of the net 4 are different in form from each other.
The projection 7g has an L-shaped distal end at the cross section G, and the total length of the projection in the longitudinal direction is equal to the first length.
It is formed longer than that of the embodiment (7e, 7f in FIG. 3). The second projection 7g is substantially the same as that of the first embodiment, but the total length in the longitudinal direction is
It is formed slightly longer than 7a to 7f.

The two locking holes 6g and 7h provided in the U-shaped groove 6a of the upper case also have slightly different forms, and the locking holes 6g corresponding to the projections 7g have the entire length. The protrusion 7g is formed to be the same as or slightly longer than the protrusion 7g.
However, on the back side of the upper case, a taper 61 is formed as shown in FIG.

The locking holes 6h corresponding to the projections 7h
Is formed to have a slightly longer overall length in the longitudinal direction than the locking hole 6b of the first embodiment (FIG. 2), and to be formed slightly longer than the entire length in the longitudinal direction of the projection 7h, and to connect the two. Have clearance at times.

The procedure for fixing the net 4 to the upper case 6 is as follows. (1st step); First, the locking hole 6 in the U-shaped groove 6a
g to two elastic bodies 5 (FIG. 4)
Is mounted on the groove 6a. Or U
FIG. 6 is a view showing an elastic body having substantially the same length as the circuitous path having the longitudinal ends of the engaging hole 6g in the U-shaped groove 6a as the start and end, and forming only a portion corresponding to the engaging hole 6h substantially at the center thereof as a hollow hole. A single long elastic body 45 (see FIG. 9C) having the same structure as that shown in FIG. 8 is placed in the groove 6a.

(Second step); As shown by the arrow P, the net 4 is held with the projection 7g downward and 7h upward, and the projection 7g is inserted into the engagement hole 6g from directly above the engagement hole 6g. While inserting, it rotates counterclockwise in the figure. At this time, since the protrusion 7h is guided by the locking hole 6h by the taper 61, the insertion is easy.

(Third Step): Locking Hole 6 of Protrusion 7g
g at the point where the fitting with rotation to g is completed.
Is fitted into the locking hole 6h, and the tip of the projection 7h is twisted on the back surface of the upper case 6, thereby completing the fixing operation. In locking the projection 7g into the locking hole 6g, the tip (L-shaped bent portion) of the projection 7g is inclined with respect to the main surface of the net as shown in FIG. Since the tip portion is formed with the thickness t1 of the elastic body, that is, the size t2 of the drop portion formed slightly smaller than t + t1, the both ends are completed upon completion of the fixing work to the upper case of the net. It is firmly fixed.

In this embodiment, the net is attached to the upper case with only two protrusions, two locking portions, and one elastic body while having the same effects as in all of the above embodiments. Can be performed reliably and accurately.

In the first, second, and third embodiments, the pawls 7 are set at both ends of the elastic body 5. However, if the function as a stopper is secured, the arrangement may be changed. Alternatively, the number may be reduced.

In each of the above embodiments, the elastic member 5,
45 is provided corresponding to each of the predetermined portions of the peripheral portion 4 a of the net 4, but is not limited to this, and is sufficient for the net 4 to be stably supported by the upper case 6 via the elastic body 5. What is necessary is just to set appropriately the number, length, and assembling position of the elastic bodies 5, 45.

In each of the above embodiments, the mounting structure of the present invention is applied to an electronic musical instrument. However, the present invention is not limited to this, and can be applied to various devices having speakers such as audio equipment.

[0053]

As described above, according to the speaker net mounting structure of the present invention, the appearance is improved while avoiding chattering, and the speaker net is assembled and disassembled without requiring any equipment such as welding or bonding. Can be facilitated.

[Brief description of the drawings]

FIG. 1 is an external view of an electronic musical instrument main body to which a speaker net mounting structure according to a first embodiment of the present invention is applied.

FIG. 2 is a partial perspective view of an upper case.

FIG. 3 is a perspective view of the speaker net as seen from the back side.

FIG. 4 is an exploded cross-sectional view showing a net and an elastic body together with a partial cross-sectional view of the upper case along the line AA in FIG. 2;

FIG. 5 is a partial sectional view showing a state where the net is assembled to the upper case.

FIG. 6 is an exploded cross-sectional view showing the second embodiment of the present invention and showing a state before the net is assembled to the upper case.

FIG. 7 is an exploded cross-sectional view showing the third embodiment of the present invention and showing a state before the net is assembled to the upper case.

FIG. 8 is an exploded perspective view of a net, an elastic body, and an upper case according to a fourth embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a state before the net is assembled to the upper case according to the fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 4 Speaker net 4a Peripheral edge 45 Elastic body 5 Elastic body 5d Open end face of elastic body 6 Upper case 6a U-shaped groove (groove) 6c Groove bottom surface 6b Through hole (locking portion) 6g, 6h Locking hole (locking portion) 7) Nail (projection) 7a-7h Nail (projection) w1 Predetermined distance

Claims (4)

[Claims] 1. A speaker net having at least two projections protruding from a peripheral portion, a case having a groove and having at least two locking portions provided in the groove, and at least one elastic fitting into the groove. Body, the projection of the speaker net is locked to the locking portion of the case,
A speaker net mounting structure, wherein a peripheral portion of the speaker net is pressed against an open end surface of the elastic body when the speaker net is locked. 2. A speaker net having at least two projections protruding from a peripheral portion, a case having a groove and having at least two through-locking holes in the groove, and at least one fitting in the groove. An elastic body, wherein the projection of the speaker net is penetrated and locked in the locking hole of the case, and at the time of locking, the peripheral edge of the speaker net presses the open end face of the elastic body. To
A structure for mounting a speaker net, wherein the at least one protruding portion is deformed after being penetrated and locked in the locking hole of the case. 3. The groove has a predetermined width in a longitudinal direction thereof, the locking hole is provided on a bottom surface of the groove, and is provided at a central portion having a predetermined distance from both side walls of the groove. 3. The mounting structure for a speaker net according to claim 2, wherein said at least one protrusion is fitted into said locking hole. 4. The device according to claim 1, wherein the length of the groove in the longitudinal direction of the projection and the length of the groove in the longitudinal direction of the locking hole are substantially the same length so that the projection and the locking hole can be fitted. A mounting structure for a speaker net according to claim 2 or 3.