JPH0442721A - Wiring fixture fixing method - Google Patents

Abstract

PURPOSE:To protect the fixing frame from deformation due to irregularities of wall face by securing the fixing frame mounting a wiring fixture to a reinforcing frame with screws, mounting the reinforcing frame and the fixing frame on the wiring fixture fixing holes and then securing the frames thereto with fixing screws. CONSTITUTION:A wiring fixture 1 is secured to a fixing frame 2. Wires wired to wiring fixture fixing holes 50 are then connected with the wiring fixture 1. The fixing frame 2 is then secured firmly with screws to a reinforcing frame 3, thus obtaining a reinforcing frame assembly. The reinforcing frame assembly is then inserted into a protective cover 42, and the reinforcing frame 3 and the fixing frame 2 are secured with screws to the wall face. At this time, the fixing frame 2 contacts at four positioning protrusions 2f, 2g and the opposite inclining faces 2h with the recessed side of the inflated part of the reinforcing frame 3 and a gap is provided between other parts. Since the gap accomodates the deformation of the reinforcing frame 3 even if the fixing screw 20 is tightened firmly, the fixing frame 2 is not subjected to deformation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for installing a wiring device on a wall surface, and in particular, the present invention relates to a method for installing a wiring device on a wall, and in particular, a method in which an operation panel larger than a switch operation section is attached to and detached from the switch operation section. Switch devices used in indoor wiring, etc., where the switch operation part is turned on and off by reversing the operation panel, and wiring devices such as connectors, which are similarly used by being mounted on a wall. Regarding the installation method.

[Prior Art] As a conventional method for installing wiring devices of this kind, for example, the present applicant previously applied for a patent, and the method was disclosed in Japanese Patent Laid-Open No. 61
There are those described in JP-A-277306.

This device connects electrical wiring to the attached wiring fixture by engaging the boss part with the mounting frame, temporarily attaches the mounting frame to the wall with mounting screws, and then exposes the head of the mounting screw of the mounting frame. After tightening and locking the reinforcing frame, which has an opening and is integrally formed with the decorative frame, to the mounting frame with tightening screws, the mounting frame is fixed to the wall surface, and a plate (exterior frame) is attached. In addition, a decorative surface plate (operation plate) is fitted to the boss portion of the wiring device.

[Problems to be Solved by the Invention] However, in this conventional method for installing wiring devices, the mounting frame to which the wiring device is attached is temporarily fixed to the wall surface with mounting screws, and the reinforcing frame is attached to the mounting frame. After tightening and locking with the tightening screws, the mounting frame is permanently fixed by tightening the mounting screws, and after that, the plate is attached, and then the decorative operation board is attached to the wiring device. Therefore, a large number of screws are used, and a lot of assembly work is required regarding the screws, such as adjusting the number of times the screws are tightened and the tightening force, resulting in a large number of assembly steps and poor work efficiency. There was a problem.

In addition, when tightening the reinforcing frame to the mounting frame with the tightening screws, the tightening screws could be tightened freely, so if the tightening screws were tightened more than necessary, the reinforcing frame could become deformed. be. In this way, if the mounting frame or reinforcing frame is deformed due to screw-fastening work, the decorative operation panel that is installed later may rub against the mounting frame, etc., which may cause malfunction of the decorative operation panel. There were also problems.

Based on the problems of the prior art, the present applicant previously filed a patent application (Japanese Patent Application No. 1-262144) for an invention capable of solving the problems. According to the invention, an electric wire is connected to the attached wiring device by passing an operating portion of the wiring device through an opening of the mounting frame and engaging the boss portion with a boss receiving portion of the mounting frame. A reinforcing frame is fitted to cover the part other than the operating section, and these reinforcing frames and mounting frames are screwed to the wall with mounting screws, and the operating board to be attached to the operating section is placed on top of this reinforcing frame. The present invention is characterized in that an exterior frame having an opening through which it passes is attached, and then the operation plate is attached to the operation section.

However, since the flatness of the wall surface on which the wiring equipment is installed is not very high, when the reinforcing frame and the mounting frame are screwed onto such an uneven wall surface with mounting screws, the multiple parts of the mounting frame that come into contact with the back side of the reinforcing frame The pressing force of the contact portion varies depending on the state of the unevenness, which may cause deformation of the mounting frame. As described above, if the mounting frame is deformed due to unevenness of the wall surface, the operation plate may rub against the mounting frame as described above, which may also cause malfunction of the operation plate. was there.

The present invention has been made in view of the problems of the prior art, and aims to solve the above problems by preventing deformation of the mounting frame due to unevenness of the wall surface.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for penetrating an operating portion of a wiring device into an opening of a mounting frame, and engaging the boss portion with a boss receiving portion of the mounting frame. Connect the electric wires to the wiring device attached to the mounting frame, fit the reinforcing frame to the mounting frame so as to cover the part other than the operating section, and fasten with fixing screws, and attach the reinforcing frame and the mounting frame to the wall. After screwing it on with the mounting screw,
The present invention is characterized in that an exterior frame having an opening through which an operation plate attached to the operation section passes is mounted on the reinforcing frame, and then the operation plate is attached to the operation section.

In addition, the above-mentioned exterior frame is composed of an outer frame body and an inner frame body, and the outer frame body provided with openings for exposing the operation part and the heads of the mounting screws is mounted on the reinforcing frame, and the outer frame body is mounted on the reinforcing frame. In the opening of the frame,
An inner frame body may be attached to cover the portion other than the operation section.

[Function] After fixing the mounting frame on which wiring devices such as switches and outlets are attached to the reinforcing frame with fixing screws, these reinforcing frames and mounting frames are installed in the wiring device mounting holes provided on the walls, ceilings, etc. of the room. By attaching the outer frame and the operation plate or the outer frame body, the inner frame body, and the operation plate sequentially from above, the wiring can be completed without deforming the mounting frame and reinforcing frame. Equipment installation work can be easily carried out.

[Example] Next, an example of the present invention will be described with reference to the drawings.

Figures 1 to 7 show one embodiment of the present invention.
The figure is an exploded perspective view of the main components according to the present invention, FIG.
a) and (b) are diagrams showing the state in which the clamping frame etc. are fixed to the wiring device mounting hole provided in the hollow wall, and Figures 3 (a) and (b) are diagrams showing the state in which the protective cover is further attached. Figure 4(a),
(b) is a diagram showing the state in which the wiring device is attached to the mounting frame, and Figures 5 (a) to (C) are diagrams showing the state in which the reinforcing frame and the outer frame body are attached to the mounting frame to which the wiring device is attached. , Figure 6(a)
, (b) is a diagram showing a state in which the inner frame body is further attached;
Figures (a) and (b) are diagrams showing a state in which an operation plate is further attached.

First, to explain the structure, 1 shown in FIG. 1 etc. is a wiring device such as a switch, an outlet, 2 is a mounting frame formed of a synthetic resin material, 3 is a reinforcing frame formed of a metal material, 4 is an outer frame body, 5 is an inner frame body, 6 is an operation panel,
The outer frame body 4, the inner frame body 5, and the operation plate 6 are each formed of a synthetic resin material.

The wiring device 1 according to this embodiment, as shown in FIG. 8 etc.
A switch has a case body 8 and a lid 9 that are fastened and fixed by a pair of fixing bands 7, and is pivotably supported on the lid 9 to turn on and off a switch mechanism built in these. The upper part of the swinging member 10 constituting the operation section is
It penetrates through an opening provided on the top surface of the lid 9 and projects upward. At the center of both sides of the upper surface of the lid 9 in a direction intersecting the swinging direction of the swinging member IO, the swinging member 10 is
Arc convex i9a that slidably supports the operation panel 6 attached to the
The swinging member 10 can easily swing by receiving the pressing force applied to the operation plate 6 at the time of on/off operation at both arcuate convex portions 9a. Further, each fixing band 7 is provided with a pair of boss portions 11 that protrude in the swinging direction for attachment to the mounting frame 2.

As shown in FIGS. 9(a) to 9(e), the mounting frame 2 has an opening 12 in the center that allows three wiring devices l to pass through at the same time, and is provided on both sides of the opening 12 in the width direction. Side walls 2a, 2
b, the left side wall 2a has three pairs of left boss receivers 13 for holding and supporting one boss 11 of the wiring device 1, and the right side wall 2b has three pairs of left side boss receiving portions 13 for holding and supporting the other boss portion 11 of the wiring device l. Three pairs of right side boss receiving portions 14 are formed for retaining and supporting the boss portion 11.

The left boss receiving part 13 consists of a receiving chamber into which one boss part 11 is fitted, and the right boss receiving part 14 consists of a receiving chamber into which the other boss part 11 is fitted.
The notches are formed on both sides of the locking piece 15 which is itself elastically deformable, and the central protrusion is interposed between the boss parts 11 so that the wiring device 1 I hold the guarantee. Furthermore, the mounting frame 2 has an opening 1.
A frame protrusion 2C is provided so as to surround the circumference of the frame protrusion 2C, and two sides of the frame protrusion 2C located in the direction intersecting the swinging force direction are provided with a chevron whose height and radius of curvature at the tip are set to be approximately equal to the arcuate protrusion 9a. The convex portion 2d is formed to face the arcuate convex portion 9a.

Furthermore, a pair of positioning protrusions 2f and 2g are provided on the fixing portions 2e at both longitudinal ends of the mounting frame 2 at appropriate intervals in the width direction. ing. Furthermore, a convex portion 2 is provided at the tip of each fixing portion 2e.
f and 2g, the back side of the reinforcing frame 3 (slanted receiving surface 22a
), forming an inclined surface 2h that abuts against the reinforcing frame 3 and the mounting frame 2 to determine the relative position between the reinforcing frame 3 and the mounting frame 2. 19 is a long hole into which the mounting screw 20 is inserted.

As shown in FIGS. 10(a) to 10(C), the reinforcing frame 3 has a bulging part 22 whose inside is bulged out in the shape of a truncated quadrangular pyramid. A rectangular opening 23 is formed through which the frame protrusion 2c of the frame 2 and the upper ends of the three wiring devices I attached thereto are inserted. On both sides of the opening 23 in the longitudinal direction, there are provided an elongated hole 24 into which the mounting screw 20 is inserted, and a screw hole 21 set at a position facing the blank hole 15. Furthermore, engagement holes 25 are provided at the four corners of the bulging portion 22 for engaging and fixing the exterior frame 4.

Note that when assembling the mounting frame 2 to the reinforcing frame, the bulge 2
The four positioning convex portions 2f and 2g are in contact with the back surface of the mounting frame 2, and the inclined surface 2C of the mounting frame 2 is in contact with the inclined receiving surface 22a on the short side.

As shown in FIGS. 11(a) to 11(C), the outer frame 4 consists of a rectangular upper plate 26 and a rectangular side plate 27 continuous to the outer edge of the upper plate 26. An opening 28 is provided at the center of the reinforcing frame 3 to expose the upper surface of the bulging portion 22 of the reinforcing frame 3. And opening 2
A flange portion 29 is provided on the periphery of the flange portion 8, and recessed portions 30 for retaining and fixing the inner frame body 5 are formed at four locations on the flange portion 29. Furthermore, the flange portion 29
There are retaining holes 2 at the four corners of the lower surface to securely hold the reinforcing frame 3.
A retaining piece 31 is provided to be inserted into the retaining piece 3.
A protrusion is formed at the tip of 1 to prevent it from coming off from the engagement hole 25.

As shown in FIGS. 12(a) to 12(C), the inner frame body 5 consists of a rectangular surface plate 33 and an inner surface plate 34 continuous to the inner edge of this surface plate 33. is provided with an opening 35 that can expose a portion of the reinforcing frame 3 that is slightly wider than the opening 23. And the surface plate 33
At the four corners of the lower surface, there are provided hooking pieces 36 that can be respectively engaged with the recessed notches 30 of the exterior frame 4. By engaging these locking pieces 36 with the recessed portions 30, the inner frame 5 can be detachably attached to and held on the outer frame 4. 32 is a notch into which the tip of a screwdriver or the like is inserted, and this notch 32 is used when removing the inner frame 5 from the outer frame 4. This inner frame body 5 and the outer frame body 4 constitute an exterior frame.

As shown in FIGS. 13(a) to 13(C), the operation plate 6 is made of a rectangular plate-like piece, and has a protruding piece in the center of the lower surface for fitting into the swinging member 10 of the wiring device 1. There are 37. Therefore, the protrusion piece 37 is formed with a protrusion 37a that can be detachably attached to the leaf spring 16 (see FIG. 8) attached to the swinging member 10. Furthermore, the operation panel 6
A bright window 38 passing through the upper and lower surfaces is provided in the center, and a transparent hood 39 is attached to the bright window 38. Note that the bright window 38 of the operation panel 6 may be replaced with an uneven identification mark.

Next, the effect will be explained.

In the embodiment shown in Figs. 1 to 7, two wiring devices 1 are attached to a mounting frame 2 in which three wiring devices 1 can be set, and this is attached to a hollow wall C to be used as a mounting device for two switches. This is an example of its use. Therefore, in this embodiment, in order to fix the mounting frame 2 and the reinforcing frame 3 to the hollow wall C, a clamping frame 4 is used to clamp the hollow wall C between the reinforcing frame 3 and the like.
0, a protective cover 42 for protecting the wire connection part of the wiring fixture l attached to the hollow wall C, and this protective cover 4.
A support frame 41 for fixing 2 to the hollow wall C is used.

As shown in FIGS. 14(a) and 14(b), the holding frame 40 is
The planar shape is U-shaped, and at both ends thereof there are screw holes 43 into which the mounting screws 20 passing through the elongated parts 24 of the reinforcing frame 3 are screwed, and set screws passing through the support frame 41 are screwed. A screw hole 44 for mating is provided. Furthermore, the clamping frame 40
The reinforcing ribs 45 are formed by continuous arc-shaped bulges in the longitudinal direction.

As shown in FIGS. 15(a) and 15(b), the support frame 41 has a rectangular planar shape, and when the hollow wall C is held between the holding plates 40, the screw holes 43 of the holding frame 40 are closed. A through hole 46 is provided at a position facing the screw hole 44, and a through hole 47 is provided at a position facing the screw hole 44.

As shown in FIGS. 16(a) to 16(C), the protective cover 42 has a U-shaped cross section, and is provided with opening ends on both sides in the longitudinal direction for securing and holding the protective cover 42 to the support frame 41. A supporting piece 48 is provided. In addition, on the bottom of the protective cover 42,
An insertion portion 49 is provided for inserting the wiring cable from the back side. This insertion portion 49 is removed by hitting the central portion with a screwdriver or the like, thereby forming an oval hole.

This mounting device can be installed by, for example, the following installation process.

First, as shown in FIGS. 2(a) and 2(b), the clamping frame 40 is inserted into the wiring device mounting hole 50 provided in the hollow wall C and placed on the inside, and a support is placed on the outside of the mounting hole 50. Frame 41
guess. Then, the threaded portion of the tightening screw 51 inserted into the through hole 47 of the support frame 41 is screwed into the screw hole 44 of the clamping frame 40, and the support frame 41 is fixed by tightening it so as to sandwich the hollow wall C.

Next, as shown in FIGS. 3(a) and 3(b), the protective cover 42 is inserted into the wiring device mounting hole 50 and the support piece 48 is locked to the support frame 41. It is secured and held on the support frame 41.

Next, as shown in FIGS. 4(a) and 4(b), the mounting frame 2
Attach and fix the wiring device 1. First of all, this is the mounting frame 2
Insert one boss portion 11 of the wiring device 1 into the left side boss receiving portion 13 of the wiring device 1, and then press the other boss portion 11 of the wiring device 1 toward the mounting frame 2 to elastically deform the locking piece 15 and release it. This is done by pushing the boss part 11 into the right boss receiving part 14.

Next, the electric wire wired to the wiring device attachment hole 50 is connected to the wiring device 1. Then, the upper surface side of the mounting frame 2 is fitted into the concave side of the bulging part 22 of the reinforcing frame 3, and the lid 9 side of the wiring device 1 is passed through the opening 23 of the reinforcing frame 3, and the wiring device 1 is operated. The parts of the mounting frame 2 excluding the frame protrusion 2c are reinforced with the reinforcing frame 3.
cover with In this state, from the back side of the mounting frame 2,
A fixing screw is inserted into the frame 3, and the threaded portion thereof is screwed into the screw hole 21 of the reinforcing frame 3 and tightened to securely screw the mounting frame 2 to the reinforcing frame 3. Thereby, the reinforcing frame assembly is assembled.

Next, insert the reinforcing frame assembly into the protective cover 42, and insert the mounting screws 20 into the elongated holes 24 of the reinforcing frame 3 and the elongated holes 1 of the mounting frame 2.
9, and its threaded portion is screwed into the screw hole 43 of the clamping frame 40 and tightened, thereby screwing the reinforcing frame 3 and the mounting frame 2 to the wall surface. Thereby, the reinforcing frame assembly can be fixed to the wiring device attachment hole 50.

In this case, the mounting frame 2 has four positioning protrusions 2f and 2g.
The inclined surfaces 2h at both ends contact the concave side surface of the bulging portion 22 of the reinforcing frame 3, and a gap is created between the concave side surface and other parts of the upper surface of the mounting frame 2.

Therefore, in order to firmly fix the reinforcing frame 3,
Even when the mounting screw 20 is strongly tightened until deformation occurs in the elongated hole 24 portion, the reinforcement frame is secured by the gap created by bringing the protrusions 2f and 2g into contact with the vicinity of the inclined receiving surface 22a, which is unlikely to be deformed. Since the above-mentioned deformation of No. 3 can be tolerated, the mounting frame 2 is not deformed. Further, since the reinforcing frame assembly comes into contact with the wall surface through a wide range of contact surfaces of the reinforcing frame 3, even if the wall surface has some irregularities, the mounting frame 2 will not be deformed as in the conventional case. Therefore, the mounting frame can always be installed without causing deformation.

Next, as shown in FIGS. 5(a) to (C), the reinforcing frame 3
Attach the outer frame body 4 to the. This can be easily done by aligning the four engaging pieces 31 of the outer frame 4 with the four retaining holes 25 of the reinforcing frame 3, and pressing the outer frame 4 toward the reinforcing frame 3 in this state. can be done.

In this case, when the outer frame 4 is pressed, the retaining piece 31 becomes elastic, the protrusion at the tip gets over the edge of the retaining hole 25, and the engaging piece 31 comes to mesh with the edge of the engaging hole 25. For,
The assembly work of the outer frame body 4 can be easily performed, and
It can be installed securely.

Next, as shown in FIGS. 6(a) and (b), the outer frame 4
The inner frame body 5 is attached to. This is done in the same way as the attachment work of the outer frame 4, by aligning the four hooking pieces 36 of the inner frame 5 with the four notches 3o of the outer frame 4, and in that state, attaching the inner frame This can be easily accomplished by pressing the latching piece 36 toward the outer frame 4 through a similar action of the latching piece 36.

Thereafter, as shown in FIGS. 7(a) and 7(b), by fitting the projecting piece 37 into the picking member 10 exposed in the opening 34a of the inner frame 5, the wiring device l is closed. The operation plate 3 is attached to the operation section. This completes the installation of the wiring fixture l to the hollow wall C.

In this case, since there is no deformation in the mounting frame 2 that was installed earlier, the operation panel 6 and the mounting frame 2 can be assembled while ensuring the necessary clearance between them. It is possible to prevent switch operation failures due to contact between the mounting frame 6 and the mounting frame 2.

In addition, in the above embodiment, an example was explained in which a wiring device is attached to a hollow wall C, but the present invention is not limited to this, and it goes without saying that the wiring device can be attached to a switch box buried in a wall. In that case, by providing screw holes for mounting screws in the switch box, it is possible to eliminate the use of the above-mentioned clamping frame 40 and protective cover 42.

FIGS. 17(a) to (C) show an embodiment in which the outer frame 4 and the inner frame 5 in the above embodiment are integrally formed to form an outer frame 52. FIG.

The exterior frame 52 has a shape that combines the outer frame body 4 and the inner frame body 5, and includes a retaining piece 53 that corresponds to the retaining piece 31 of the outer frame body 4. The recessed portion 30 of No. 4 and the hooking piece 36 of the inner frame body 5 are unnecessary and have therefore been removed. The other configurations are the same as those in the previous embodiment.

In this embodiment, the number of components is one less than in the above embodiment, so this type of installation work can be performed more easily and the configuration can be simplified. I can do it.

[Effects of the Invention] As explained above, since the present invention is configured as described above, it produces the effects as described below.

In the wiring device installation method of claim 1, since the mounting frame is screwed to the reinforcing frame and the reinforcing frame is screwed to the wall surface, deformation of the mounting frame due to tightening of the mounting screws can be prevented. Therefore, it is possible to prevent switch operation failures due to contact between the operation plate and the mounting frame. Furthermore, the operation panel and exterior frame can be easily installed and removed, and the entire reinforcing frame can be exposed simply by removing them, making assembly of wiring devices extremely easy. can.

In addition, in the wiring device installation method of claim 2, the operation panel, the outer frame body, and the inner frame body can be installed and removed more easily, and the entire reinforcing frame can be removed simply by removing them. It can be exposed, making it easier to assemble the wiring equipment.

[Brief explanation of the drawing]

Figures 1 to 16 show one embodiment of the present invention, with Figure 1 being an exploded perspective view of the main components of the present invention, and Figures 2 (a) and 2 (b) showing a structure installed in a hollow wall. A front view and a cross-sectional view showing a state in which the clamping frame etc. is fixed to the wiring device mounting hole, Part 3
Figures (a) and (b) are a front view and sectional view showing the state in which the protective cover is further attached, and Figures 4 (a) and (b) are a front view and side view showing the state in which the wiring device is attached to the mounting frame. figure,
Figures 5 (a), (b), and (c) are a front view, a vertical cross-sectional view, and a cross-sectional view showing the state in which the reinforcing frame and the outer frame are attached to the salt 44 frame to which the wiring equipment is attached; Figures (a), (b)
) is a front view and a bottom view showing a state in which the inner frame body is further attached, FIGS. 7(a) and (b) are a front view and a side view showing a state in which an operation panel is further attached, and FIG. 8 is a wiring device. Perspective views of FIGS. 9(a), (b), and (c). (d) and (e) are a front view, left and right side views, a bottom view, and a sectional view taken along the line XX of the mounting frame according to the present invention, and FIG. 10(a). (b) and (c) are the same front view, lower half cross-sectional side view, right half cross-sectional bottom view, and Figures 11 (a) and (b) of the reinforcing frame.
). (C) is the same front view, lower half cross-sectional side view, and right half cross-sectional bottom view of the outer frame, FIGS. 12(a), (b),
(c) is the same front view, lower half cross-sectional side view, and right half cross-sectional bottom view of the inner frame, FIGS. 13(a), (b),
(c) is the same front view, central longitudinal cross-sectional view, and rear view of the operation panel, FIGS. 14 (a) and (b) are the same front view and bottom view of the holding frame, and FIGS. 15 (a) and (b). are the same front and bottom views of the support frame, Figures 16(a), (b), (
c) is a front view, side view, and cross-sectional view of the protective cover, and FIGS. 17(a), (b), and (c) are a front view and lower half cross-section of an exterior frame according to another embodiment of the present invention. FIG. 2 is a side view and a right half cross-sectional bottom view. l: Wiring equipment 2f, 2g: Convex portion 3: Reinforcement frame 5: Inner frame 10: Neck movement member 13.14: Post holder 2: Mounting frame 2h: Inclined surface 4: Outer frame 6: Operation plate 11: Boss portion 19.24: Elongated hole 20: Mounting screw 40: Holding frame 42 2nd protective cover 52: Exterior frame 22: Swelling portion 41: Support frame 50: Wiring device mounting hole C: Hollow wall

Claims (2)

[Claims] (1) Pass the operation part of the wiring device through the opening of the mounting frame, engage the boss part with the boss receiving part of the mounting frame, connect the electric wire to the attached wiring device, and connect the electric wire to the installed wiring device. Fit the reinforcing frame so as to cover the part other than the operation part, and screw it in place with fixing screws. After fixing these reinforcement frames and the mounting frame to the wall surface with the mounting screws, place the said operation part on top of the reinforcing frame. 1. A method for installing wiring equipment, comprising: mounting an exterior frame provided with an opening through which an operation panel to be attached to the operation section passes, and then attaching the operation panel to the operation section. (2) Pass the operation part of the wiring device through the opening of the mounting frame, engage the boss part with the boss receiving part of the mounting frame, connect the electric wire to the attached wiring device, and connect the electric wire to the mounted wiring device. Fit the reinforcing frame so as to cover the part other than the operation part, and screw it in place with fixing screws. After fixing these reinforcement frames and the mounting frame to the wall surface with the mounting screws, place the said operation part on top of the reinforcing frame. an outer frame body having an opening to expose the part and the head of the mounting screw, and an inner frame body that covers the part other than the operating part is attached to the opening of the outer frame body. . After that, the operation panel is attached to the operation section.