KR101890880B1 - Hinge reinforcement consisting of integral protective cover and hinge installation method using it - Google Patents

Abstract

The present invention relates to a hinge reinforcement with an integral protective cover and a hinge installation method using the same, by which it is possible to shorten the working time by providing the hinge reinforcement and the protective cover in an integrated state so that only the hinge reinforcement is welded at a construction site. In addition, the width of the portion where the hinge bolt is received in the protective cover is reduced to a minimum, so that it is possible to prevent the deterioration of the heat insulation and the sound insulation efficiency. In addition, the hinge bolt and the receiving portion thereof coincide with each other at an accurate position, so that the integration work of the hinge reinforcement and the protection cover can be quickly achieved. According to the present invention, a hinge reinforcement with an integral protective cover includes the hinge reinforcement including a fixing portion in which an upper portion and a front surface of a lower portion are welded to each other in an inside thereof in which a hinge installing hole is formed in a door frame to install a hinge, and an installing portion extending and protruding rearward between the upper and lower fixing portions to fix the hinge and formed with a plurality of hinge bolt holes to be coupled to hinge bolts; the protective cover formed of a plate and having a front surface disposed on a rear surface of the installing portion, wherein the protective cover is formed with a bolt receiving portion which is recessed rearward at respective positions corresponding to the hinge bolt holes, and receives a threaded portion of the hinge bolt that passes through the hinge bolt hole; fixing means for fixing the protective cover integrally to a rear surface of the installing portion; and positioning means for matching the hinge bolt hole and the bolt receiving portion to the correct position.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hinge reinforcement and a hinge installation method using the same,

More particularly, the present invention relates to a hinge reinforcement for protecting a screw portion of a hinge bolt, which is fastened to the hinge reinforcement, The present invention relates to a hinge reinforcement and a hinge securing method using the hinge bolt, and more particularly, to a hinge reinforcement which is integrally formed with a protective cover for shortening the hinge installation time and replacing the hinge bolt.

In general, the hinges are installed on the door frame using hinges so that they can be opened and closed while supporting the doors of the hinged type. The hinges are connected to the plates provided on both sides of the hinges on the rotation axis. And the plate installed on the other door is rotated to open and close the door.

Among the doors, fire doors made of a metal material for the purpose of fire prevention are heavy in weight and can not be installed directly on the door frame. That is, since the door frame provided at the opening of the wall is formed of a thin steel plate having a thickness of about 1.6 mm and the plate thickness of the hinge is about 3 mm, the door frame can not be supported by the weight of the fire door .

As one example of the prior art that is capable of installing a heavy fire door on a door frame, Patent Registration No. 1469598 (name: door hinge reinforcement for a fire door and door for a fire door that is assembled with the hinge reinforcement) is disclosed. The hinge reinforcement member is fixed to the inner side of one side plate constituting the front door member of the user for reinforcement so as to reinforce the hinge. The hinge reinforcement member is vertically formed so as to be in close contact with one side plate of the front member, A hinge fixing plate on which a plurality of hinge fixing tap holes are formed at positions corresponding to the plurality of assembly holes; A plate head bolt formed on the hinge fixing plate for fixing the hinge reinforcement piece is inserted through the reinforcing plate fixing hole formed on the one side plate and is fastened to the outside of the hinge fixing bolt, And a plurality of reinforcing-part fixing taps for forming a dish-head-digging groove to be inserted with one side plate interposed therebetween while being compression-folded.

That is, in the structure of the prior art in the related art, a reinforcing piece for providing a supporting force is provided inside the fire door, and the reinforcing piece is connected to the door frame by a hinge.

Alternatively, in contrast to the prior art, the door frame may be formed with an opening to be provided with a hinge, a reinforcing bar may be fixed inside the door frame, and a hinge and a reinforcing bar may be fixed by bolts.

However, since one end of the hinge bolt for fixing the hinge and the reinforcing bar fixed to the fire door or the door frame passes through the reinforcing bar and comes into contact with the filled filler material for heat insulation and soundproofing inside the fire door or the door frame, The water contained therein corrodes the threaded portion of the hinge bolt, so that it is impossible to dismantle the broken hinge when the hinge is broken.

In order to solve the above problems, a protector-shaped protective cover 4 for housing a reinforcing bar 2 fixed inside the door frame 1 and protecting the hinge bolt 3 is provided as shown in FIG.

In the conventional fixing method of the protective cover 4, the reinforcing bar 2 is first welded to the inside of the door frame, and then the reinforcing bar 2 is fixed to the door frame 1 by welding while the reinforcing bar 2 is housed inside the protective cover 4 .

However, if the conventional protective cover is fixed to the door frame as described above, the filling material c is not charged as much as the internal space of the housing shape, and the insulation and sound insulation efficiency of the portion is lower than that of other portions. The protective cover is welded to the door frame twice with the reinforcing bar, and the corresponding portion of the door frame is deformed due to the high temperature. Moreover, since the reinforcing plate must be welded first when the door frame is constructed, It is troublesome to fix the welding and the work time is increased.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a hinge support and a protective cover in an integrated state, It is possible to reduce the width of the portion accommodating the bolt to a minimum and to prevent deterioration of the insulation and sound insulation efficiency and to quickly integrate the hinge bolt and the protective cover by configuring the hinge bolt and the receiving portion thereof to match the correct positions And a hinge mounting method using the hinge bracket.

The present invention is configured as follows to achieve the above object. That is, in order to provide a hinge, a hinge attachment hole is formed in the door frame, and the hinge attachment hole is formed in the hinge attachment hole. The upper and lower front surfaces are fixed by welding. A hinge brace comprising a hinge bolt for fixing the hinge and a mounting portion formed with a plurality of hinge bolt holes penetrating to be engaged with the hinge bolt; And a bolt receiving portion formed to be recessed rearward at respective positions corresponding to the plurality of hinge bolt holes and receiving the screw portion of the hinge bolt passed through the hinge bolt hole is formed And a fixing means for fixing the protective cover integrally to the rear surface of the mounting portion.

Further, the present invention is characterized by further comprising positioning means for fixing the hinge bolt hole and the bolt receiving portion in a fixed position by fixing with the fixing means.

In addition, the fixing means is characterized in that the rear surface of the mounting portion is in close contact with the front surface of the protective cover, and the upper and lower ends of the closely attached protective cover are fixed by spot welding.

Alternatively, the fixing means may have bolt fixing holes formed in the inner peripheral edge of the upper and lower sides of the mounting portion at a predetermined depth, respectively. In the position of the protective cover corresponding to the bolt fixing holes, through- And a fixing bolt which penetrates through the bolt through hole at the rear surface of the protective cover and then fastens and fixes the bolt through a bolt fixing hole.

On the other hand, the positioning means is provided with a door frame abutting portion, one side of which is folded forward, the folded front face of which is in contact with the inner surface of the door frame, and the inner side is in contact with one side of the hinge reinforcement, And a side contact / closure part which cooperates with the hinge bolt hole and the bolt receiving part and closes one open side of the hinge reinforcement band protruding rearward so that the hinge is provided.

Alternatively, the positioning means may include a positioning groove recessed inwardly on the upper side and a lower side of the mounting portion, and a positioning groove formed on the positioning groove so as to protrude outwardly at a position corresponding to the positioning groove in the protective cover, And a convex fitting portion inserted and aligned.

Alternatively, the positioning means may include: a stopper bolt hole formed on the inner circumferential edge with a predetermined depth at an interval on both sides of the upper portion of the mounting portion; and a stopper bolt hole having a bolt head and a rear surface of the mounting portion, And a stopper insertion groove formed in a U-shape at a position corresponding to the stopper bolt at an upper end of the protective cover.

Alternatively, the positioning means comprises hooks bent forward and to the upper and lower ends of the protective cover, respectively, so as to be hooked on the upper and lower portions of the rear surface of the mounting portion projecting rearward from the fixing portion.

And a hinge bolt hole formed in the mounting portion, wherein the hinge bolt hole is formed at a position corresponding to the hinge bolt hole, A step of arranging a protective cover formed with a bolt accommodating portion formed concavely in a predetermined position by a positioning means and fixing the same by a fixing means so as to be integrated with the hinge mounting hole; A step of fixing one side of the protective cover so as to be in surface contact with an inner side surface of the door frame and then fixing them by welding; a step of fixing the hinge bolt hole and the bolt formed on one side plate of the hinge through the hinge mounting hole, After the holes have been aligned, they are fastened with hinge bolts so that the ends of the threaded portions of the hinge bolts are accommodated in the bolt receiving grooves It is characterized in that step consisting of.

According to the present invention constructed as described above, it is possible to reduce the number of processes for installing a fire door at a construction site by providing the hinge reinforcement and the protective cover in a state where they are integrated by using fixing means at a work site for manufacturing the protective cover, .

Further, in the process of fixing the hinge reinforcement member and the protective cover, the center of the hinge bolt hole and the bolt accommodating portion are aligned by using the positioning means, whereby the fixing failure rate of the hinge reinforcement can be remarkably reduced and the operator can easily and easily fix the hinge reinforcement and the protection cover So that the efficiency of operation can be improved.

Further, since the bolt receiving grooves are formed in a small volume independently formed to receive the respective fixing bolts, the filling material filling the inside of the door frame is filled between the outer surfaces of the bolt receiving portions to prevent deterioration of heat insulation and sound insulation efficiency And the outer surfaces of the respective bolt receiving portions are embedded in the filler material, so that the bolt receiving portion is tightly fixed.

In addition, since the threaded portion of the hinge bolt is received in the bolt receiving portion, it is protected against moisture present in the door frame, thereby preventing breakage due to corrosion.

1 is a plan view showing a process of installing a conventional hinge,
FIG. 2 is an exploded perspective view showing a state in which a hinge is provided on a hinge reinforcement with an integral protective cover according to the present invention. FIG.
Fig. 3 is an exploded perspective view showing a hinge support and a protective cover according to the present invention,
Fig. 4 shows a fixed state of Fig. 3, wherein (a) is a perspective view, and Fig. 4 (b)
FIG. 5 is a perspective view illustrating a state in which the hinge reinforcement and the protective cover according to the present invention are fixed by fixing bolts, which are fixing means, in an integrated state, wherein (a) is a perspective view,
6 is an exploded perspective view illustrating the position of the hinge support bar and the protective cover according to the present invention by using a side contact /
Fig. 7 shows a state where the position is determined by the method of Fig. 6, wherein (a) is a perspective view, and Fig. 7 (b)
FIG. 8 is an exploded perspective view of a hinge support and a protective cover according to the present invention,
Fig. 9 shows a state where the position is determined by the method of Fig. 8, wherein (a) is a perspective view, and Fig. 9 (b)
10 is an exploded perspective view of a hinge support and a protective cover according to the present invention, in which a position is determined by using a stopper bolt and a stopper insertion groove,
Fig. 11 is an exploded perspective view showing a state in which a stopper bolt is fixed to a hinge support bar in Fig. 10,
12 is an enlarged side view of Fig. 11
Fig. 13 is an exploded perspective view illustrating the position of the hinge support and the protective cover according to the present invention,
Fig. 14 shows a state where the position is determined by the method of Fig. 13, wherein (a) is a perspective view, and Fig. 14 (b)
Fig. 15 is a plan view showing a state in which a hinge is provided after a hinge reinforcement bar integrated with a protective cover according to the present invention is installed on a door frame
16 is a side sectional view showing a state in which a hinge is provided on a hinge reinforcement with an integral protective cover according to the present invention
17 is a block diagram showing a method in which a hinge is installed on a hinge reinforcement with an integrated protective cover according to the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2, the hinge support 100 includes a hinge 100 installed inside the door frame 500 and a protective cover 200 integrally formed on the rear surface of the hinge 100 using a fixing unit 300, .

Further, the positioning means 400 is further configured so that the protective cover 200 can be fixed at a predetermined position of the hinge support 100.

Hereinafter, the portion where the hinge 600 is provided on the hinge support 100 is set to be front or front, the portion to which the protective cover 200 is fixed is set to be rear or rear, The hinge base 100 will be referred to as an upper portion and a lower portion in a standing state.

The door frame 500 is formed such that a hinge hole 510 is formed by opening a portion where the hinge 600 is installed so that the front surface of the hinge support 100 is exposed to the outside.

2 to 4, the hinge support 100 is fixed to the inside of the door frame 500 by being integrally fixed with a protective cover 200 to be described later, The fixing part 110 is formed on the upper part and the lower part, respectively, and the front surface of the fixing part 110 is welded to the upper and lower parts of the inner surface of the hinge mounting hole 510 formed in the door frame.

The mounting portion 120 is formed with a mounting portion 120 extending and protruding rearward from the fixing portions 110 formed at the upper and lower portions of the hinge support 100 so as to have a depth d, A plurality of hinge bolt holes 130 penetrating the hinge bolts 610 for fixing the hinge bolts 610 are formed.

The reason why the depth d is provided on the front surface of the fixing part 110 and the front surface of the mounting part 120 is that the hinge 600 is hinged to the hinge 600 when the hinge 600 is installed on the front surface of the hinge 100, So that the height of the front surface of the door frame 500 matches the height of the front surface of the door frame 500.

Therefore, the thickness of the door frame 500 is 1.6 mm, the thickness of the plate of the hinge 600 is 3 mm, the thickness of the hinge support 100 is 4 mm, d may be 1.4 mm which is obtained by subtracting the thickness of the door frame 500 from the thickness of the hinge plate 600 so that the height of the plate of the hinge 600 and the front surface of the door frame 500 may be the same.

Further, the hinge bolt hole 130 is preferably arranged so that a plurality of the hinge bolt holes 630 are arranged in the shape of "" or "Z" so that the weight of the fire door 700 can be dispersed and supported by the hinge bolt 610.

The protective cover 200 is fixed to the rear surface of the hinge support 100 and the fixing means 300 so as to be integrated with the hinge support 100 so as to receive the screw of the hinge bolt 610 fixing the hinge 600 The bolt hole 130 is formed in a plate shape corresponding to the width and length of the rear surface of the mounting portion 120 and is formed with a bolt accommodating portion formed at a position corresponding to the hinge bolt hole 130 and recessed from the front surface to the rear surface. (210).

The hinge bolt 610 fastening the hinge 600 and the hinge reinforcement 100 is received in the bolt receiving part 210 while being fastened to the hinge bracket 100 and then received by the door frame 500 The hinge bolt 610 can be easily replaced by releasing the hinge bolt 610 even when the hinge 600 is broken in the future .

The shape of the bolt receiving portion 210 may be circular, polygonal or conical, and may be formed by accommodating a space therein.

By forming the bolt receiving portion 210 so as to be close to the diameter of the hinge bolt 610, the outer circumferences of the arranged bolt receiving portions 210 are widely spaced apart from each other, (c) is filled with a space to prevent deterioration of insulation and sound insulation efficiency, and the outer periphery of the bolt accommodating portion 210 is firmly fixed to the filler (c).

The fixing means 300 is configured to integrally fix the hinge support 100 and the protective cover 200, and thus the present invention provides two embodiments.

3 and 4, the front surface of the protective cover 200 is brought into close contact with the rear surface of the mounting portion 120, and the upper and lower ends of the protective cover 200, And fixed by spot welding (310).

When the hinge support 100 and the protective cover 200 are fixed with the spot welding 310 as described above, the fixation force is increased together with the adhesion force, so that even if a large impact such as an earthquake is received, the fixture can be maintained without being disassembled.

5, a bolt fixing hole 320 is formed at a predetermined depth so as not to penetrate the upper side and the lower side of the mounting part 120, and a thread is formed on the inner periphery of the bolt fixing hole 320, And a bolt through hole 321 is formed in the protective cover 200 corresponding to the bolt fixing hole 320. The bolt penetrating hole 321 passes through the rear of the protective cover 200 and passes through the bolt through hole 321 And a fixing bolt 322 fastened to the bolt fixing hole 320 of the hinge reinforcement 100.

Thus, the operator can quickly and easily integrally fix the hinge support 100 and the protective cover 200 with the fixing bolts 322, thereby providing convenience of operation.

The hinge bolt hole 130 and the bolt receiving portion 210 must be exactly matched when the hinge bracket 100 and the protective cover 200 are integrally fixed using the fixing means 300, The bolt 610 can be fixed without being released and protected from the moisture of the door frame 500. Therefore, the present invention constitutes the positioning means 400 which provides four examples for easily fixing and fastening the hinge bolt hole 130 and the bolt receiving portion 210 with ease.

6 and 7, a first side of the protective cover 200 constitutes a side contact / closure part 410 which is bent forward and in which the hinge support 100 is located And a door contact portion 411 which is in contact with the inner surface of the door frame 500 at an end of the side contact and closure portion 410. [

When the inner surface of the side contact / closure part 410 configured as described above is in contact with one side surface of the hinge support 100, movement in the width direction is restrained, thereby moving the protective cover 200 upward and downward, After fixing the hinge bolt hole 130 and the bolt receiving portion 210 with the naked eye, the fixing bolt hole 130 and the bolt receiving portion 210 can be fixed using the fixing means 300. [

In addition, the side contact / closure part 410 closes one side opened by the attachment part 120 having the depth d in the fixing part 110, and the door frame contact part 411 is closed by the inside part So that the heat insulation and the sound insulation efficiency can be enhanced.

One side of the hinge reinforcement 100 is closed by the side contact blocking portion 410 and the other opened side is closed in contact with the inner side of the door frame 500 to be filled in the door frame 500 The filler (c) and moisture are prevented from penetrating into the hinge (600), thereby preventing corrosion.

8 and 9, a positioning groove 420 is formed on the upper side and the lower side of the mounting portion 120 to be inwardly recessed, The protective cover 200 at the position corresponding to the groove 420 is constituted by the convex fitting portion 421 protruding outwardly.

Therefore, when the convex portion 411 is aligned with the positioning groove 420 formed on the upper side and the lower side, movement of the protective cover 200 in the up, down, left, and right directions is restricted, The hinge bolt hole 130 and the bolt accommodating portion 210 are naturally matched with each other, so that the convenience and speed of the operation can be provided.

In addition, the shape of the positioning groove 420 and the convex fitting portion 421 may be semicircular or quadrangular, or may have a long groove shape such as "⊂ ⊃".

Next, as shown in FIGS. 10 to 12, the third embodiment includes a stopper bolt hole 430 having a predetermined depth and spaced apart on the same line on both sides of the mounting portion 120, .

The stopper bolt 431 is fastened to the stopper bolt hole 430 such that the bolt head 432 and the rear surface of the mounting portion 120 have a gap g after the fastener 431 is fastened. Respectively. Here, the gap g between the bolt head 432 and the mounting portion 120 is spaced apart by a length that can accommodate the thickness of the protective cover 200. For example, when the thickness of the protective cover 200 is 0.8 mm, the length is spaced within a range of 0.8 mm to 1.0 mm.

The stopper bolt hole 430 is formed in a protective cover corresponding to the stopper bolt hole 430. The bolt head 432 has a gap g The hinge bolt hole 130 and the bolt accommodating portion 210 are naturally aligned with each other when the stopper bolt 431 is inserted into the stopper inserting groove 433. When the stopper bolt 431 comes into contact with the inner surface of the stopper bolt 433, 300) so as to be integrated.

Here, the configuration of the convex fitting portion 421 of the second embodiment, or the configuration of the stopper bolt 431 and the stopper insertion groove 433 of the third embodiment, The positioning means 400 configured in such a manner can be used in combination with the hinge support 100 and the protective cover 200 in the upper, lower, left, and right directions Not only the convenience and speed of operation of the fixing means 300 can be restrained by restricting the movement of the hinge support 100, but also the open side of the hinge support 100 is closed by the side contact closure part 410, And the other side can close the side surface of the door frame 500, so that the door frame 500 has an effect of protecting the inside of the door frame 500 from moisture causing corrosion.

In the fourth embodiment, as shown in FIGS. 13 and 14, the mounting portion 120 protruding rearward from the fixing portion 110 is bent upward and downward to naturally protrude rearward, And an engaging portion 440 which is formed by bending an upper end and a lower end of the protective cover 200 corresponding respectively to the lower portion and the lower portion, respectively.

Accordingly, the latching part 440 is formed at the upper end and the lower end of the protective cover 200, respectively. When the latching part 440 is in contact with the rear surface of the mounting part 120, the upper and lower parts of the mounting part 120 are inserted into the latching part 440 And the position of the protective cover 200 can be determined by restricting the movement of the protective cover 200 in the upward and downward directions.

Here, the retaining portion 440 is formed on the protective cover 200 in combination with the side contact / closure portion 410 constituting the first embodiment, and the protection cover 200 is in contact with the hinge support 100 It is possible to easily and easily determine the position.

The hinge installation method using the present invention thus configured is as follows.

15 to 17, the hinge bolt hole 130 and the bolt accommodating portion 210 are fitted to the rear surface of the hinge support 100 so as to be in the correct position by using the positioning means 400, (S10) of tightly fixing the hinges 200 by tightly fixing them using the fixing means 300 and delivering them together, and the other side of the hinge bracket 100, which is delivered, And a step S20 of fixing the hinge bolt hole to the hinge bolt hole through the hinge mounting hole 510 formed in the door frame 500 where the hinge support 100 is fixed. 130 and the plate provided on one side of the hinge 600 are fastened and fixed by the respective hinge bolts 610 so that the end of the screw constituting the hinge bolt 610 is fastened to the bolt receiving portion 210), respectively (Step S30).

As described above, the hinge reinforcement 100 and the protective cover 200 are arranged in the correct position by using the positioning means 400, and are firmly fixed using the fixing means 300, (100) can be produced easily and quickly, and the hinge assembly (100), which is manufactured in the workplace, is moved to the construction site and fixed by welding to the door frame without a separate installation process, And a hinge bracket that is integrally provided with a useful protective cover for preventing deformation of the door frame due to high heat by reducing the number of times of welding that is fixed two times on the inner surface of the door frame, Can be provided.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

Hinge Reinforcement Base: 100 Fixed portion: 110
Mounting area: 120 Hinge bolt hole: 130
Protective cover: 200 volts receptacle: 210
Fixing means: 300 spot welding: 310
Bolt fixing hole: 320 bolt through hole: 321
Fixing bolt: 322 Positioning means: 400
Side contact and closure part: 410 door contact part: 411
Positioning groove: 420 convex alignment part: 421
Stopper bolt hole: 430 Stopper bolt: 431
Bolt Head: 432 Insert Top Groove: 433
Hanging part: 440 Doorframe: 500
Hinge mounting hole: 510 Hinges: 600
Hinge bolt: 610 Fireproof door: 700:

Claims (9)

A fixing part 110 welded to an upper part and a lower part of the lower part of the door frame 500 with a hinge mounting hole 510 opened to the door frame 500 for mounting the hinge 600; And a mounting portion 120 having a plurality of hinge bolt holes 130 formed to extend through the hinge bolt 610 so as to extend rearward with a depth d between the hinge bolts 610 and 110, A hinge reinforcement member (100);
The hinge bolt hole 130 is formed in the shape of a plate and the front surface of the hinge bolt hole 130 is disposed on the rear surface of the mounting portion 120. The hinge bolt hole 130 is recessed rearward at respective positions corresponding to the plurality of hinge bolt holes 130 A protective cover 200 having a bolt receiving portion 210 for receiving a threaded portion of the bolt 610;
Fixing means 300 for fixing the protective cover 200 integrally to the rear surface of the mounting portion 120;
And a positioning means 400 for fixing the hinge bolt hole 130 and the bolt receiving portion 210 in the fixed position and fixing the fixing means 300,
The positioning means 400 includes a stopper bolt hole 430 formed at an inner circumference thereof with a predetermined depth at an interval on the same line on both sides of the mounting portion 120,
A bolt head 432 and a stopper bolt 431 fastened to the rear surface of the mounting portion 120 so as to have a spacing g spaced apart from the stopper bolt hole 430 to receive the thickness of the protective cover 200,
And a stopper inserting groove 433 formed in the upper end of the protective cover 200 and formed in a U-shape with an open top at a position corresponding to the stopper bolt 431,
The stopper bolt 431 provided at the rear portion of the mounting portion 120 is spaced apart from the stopper bolt 431 by a predetermined distance. A hinge brace.
delete The method according to claim 1,
The fixing means 300 closely contacts the rear surface of the mounting portion 120 and the front surface of the protective cover 200 and fixes the upper and lower ends of the closely attached protective cover 200 by spot welding 310 Wherein the protective cover is integrally provided.
The method according to claim 1,
The fixing means 300 has bolt fixing holes 320 formed in the inner periphery of the upper and lower sides of the mounting portion 120 with a predetermined depth,
A bolt through hole 321 is formed at a position of the protective cover 200 corresponding to the bolt fixing hole 320 so as to penetrate the bolt through hole 321 from the rear surface of the protective cover 200, And a fastening bolt (322) fastened to the hole (320) to fix the fastening bolt (320).
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