KR101954442B1 - Distribution panel having omnidirectional earthquake-proof function - Google Patents

Abstract

In a distribution panel which is used for distributing power to various industrial facilities and housing facilities, the present invention relates to a distribution panel having an omnidirectional earthquake-proof function which absorbs an earthquake motion which arrives at a distribution panel in not only horizontal, vertical but complex directions when an earthquake occurs, prevents the distribution panel from being twisted, restores an original state of the distribution panel when the distribution panel is twisted and protects power devices inside the distribution panel, thereby safely operating the distribution panel. The distribution panel having an omnidirectional earthquake-proof function comprises a distribution panel case (11), a case support member (12), a ground fixing member (13), a vertical vibration absorbing member (14), a twist preventing member (15) and a twist preventing key (16).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a distribution board having omnidirectional seismic performance,

The present invention relates to a distribution board used for distributing electric power to various industrial facilities or residential facilities, and it is an object of the present invention to provide a distribution board for distributing electric power to various industrial facilities or residential facilities, To an undivided power distribution panel, and to restore the undesired distortion of the power distribution board, thereby protecting the power devices in the power distribution board and safely operating the power distribution board.

In general, the switchboard is a device for uniformly managing switches, instruments, and relays (relays) for the operation and control of a power plant or a substation, and for driving an electric motor. Various power devices for distributing the power devices are provided, or panels for controlling the devices are provided.

In such a switchboard, when vibration or impact is applied, it is important to design earthquake-proof because various electric power equipment installed therein may be broken, thereby blocking power supply or causing fire. Particularly, in recent years, the frequency of occurrence of earthquakes has greatly increased, and the strength of earthquakes has also been increasing. Therefore, the importance of seismic design will be greater than ever.

Korean Patent No. 10-1081571 (registered on November 2, 2011) was proposed as an example of techniques for strengthening seismic resistance of an ASSEMBLY using an earthquake-proof spring. Korean Patent No. 10-1081571 proposes a method for preventing breakage in a transmission / reception panel due to twisting or tilting of a transmission / reception panel due to vibrations or shocks caused by a crustal change caused by an earthquake such as an earthquake, We proposed a seismic isolation system using a seismic spring to facilitate the height and horizontal adjustment of the switchboards with different weights.

Korean Patent No. 10-1081571 discloses that a P wave (primary wave) having the same traveling direction of a wave and a moving direction of a wave due to vibration is absorbed by an absorption means and an earthquake-proof spring and an S wave secondary wave) can be prevented from affecting the power devices installed inside the switchgear, thereby protecting the power devices inside the switchgear from impact, thereby preventing leakage.

As described above, Korean Patent No. 10-1081571 has a basic shock mitigation function for the graphical P-wave and S-wave, but the waves transmitted through various types of strata and various types of building structures and facilities have a complex traveling direction The seismic spring installed on the vertical line has a limitation in exhibiting a sufficient buffering function.

As another example, in Korean Patent No. 10-1446890 (Registered on Apr. 25, 2014), a vibration pad for absorbing vibrations is provided at the lower part of a power / communication facility including an electric distribution board, and in particular, And the shaft provided on the dustproof pad is divided to be vertically bent so as to effectively absorb and cushion vibrations and shocks caused by a seismic wave to protect electric power / communication equipment such as an electric power distribution board from an earthquake. Further, in case of a disaster such as an earthquake A vertical refracting type vibration damping pad and a vibration damping switchboard having the same are proposed to prevent a second disaster caused by interruption of electric power and communication.

Thus, in Korean Patent No. 10-1446890, when the earthquake occurs, the vibration pad is vertically bent to effectively absorb and cushion vibration and shock acting in the vertical and horizontal directions, and ultimately to protect the switchboard from earthquakes However, as in Korean Patent No. 10-1081571, seismic forces reaching the switchboard due to the occurrence of earthquakes are mostly applied not only horizontally and vertically but also in a composite direction. Therefore, when an excessive torsional stress is applied, There is a problem that the vibration and impact due to the earthquake can not be sufficiently mitigated.

As another example, an earthquake-resistant design technique for an earthquake-resistant switchboard using a seismic isolation design is proposed in Korean Patent No. 10-1178264 (registered on Aug. 23, 2012). Korean Patent No. 10-1178264 discloses a switchgear case and a switchgear mount which supports the switchgear case and blocks shock waves generated by an earthquake or the like in the switchgear case, Three plates and a plurality of tension springs disposed between the plates to attenuate shock waves such as seismic waves applied from below.

The system proposed in Korean Patent No. 10-1178264 can be viewed as a form of a seismic design in which the natural period of the transmission / reception system is lengthened so that the vibration energy of the ground due to the earthquake is not transmitted to the transmission / Therefore, it is possible to provide superior seismic performance compared to Korean Patent No. 10-1081571 and Korean Patent No. 10-1446890 using spring or elastic tube simply because it is longer than the earthquake vibration period of 1 second or less.

However, in Korean Patent No. 10-1178264, a large-sized three-plate structure such as an upper plate and a lower plate is required to have a size equal to or larger than the entire bottom of a structure, and a large number of tension springs, ELM bearings, Not only is it costly to manufacture, but it is bulky due to the large number of parts, and heavy weight makes it difficult to apply to switchgear. In addition, when an impact force due to an earthquake enters in a direction coinciding with the angle at which the LM bearing, the LM guide, the tension spring, and the like are installed, there is a problem in that there is a limit to sufficiently absorb and cushion impact.

In order to solve these problems, in Korean Registered Patent No. 10-1778155 (Registered on July 27, 2017) proposed and registered by the present applicant, in addition to the resilient design structure for absorbing the earthquake vibration by the spring, It is possible to safely protect the switchboard with precision instruments from the shock of earthquake and to extend the vibration period of all earthquake motions entering in all directions, Switchboards were proposed.

Korean Patent No. 10-1778155 proposes a seismic-performance switchboard having a swing state in the horizontal direction regardless of the approach direction of the earthquake-induced vibration as the vibration period of the impact force due to the earthquake-induced vibration transmitted to the upper and lower plates becomes significantly longer And the impact force due to the earthquake was hardly transmitted to the switchboard. As a result, it is possible to safely operate the switchboard by protecting the devices inside the switchboard.

However, in Korean Patent No. 10-1778155, it is possible to safely protect the switchboard with the precision equipment from the shock of the earthquake by absorbing the vertical vibration caused by the spring. However, There is still a problem that the apparatus can not be restored to its original state in the event of distortion of the switchboard.

KR 10-1081571 B1, Nov. 2011. KR 10-1446890 B1, 2014. 09.25. KR 10-1178264 B1, 2012. 08. 23. KR 10-1778155 B1, 2017. 09. 07.

Accordingly, the present invention has been proposed in order to solve the problems of the prior art, and it is an object of the present invention to provide a shock absorber capable of preventing earthquake vibrations reaching the switchboard in a horizontal direction and a vertical direction, It is an object of the present invention to provide a switchboard having an omni-directional seismic performance capable of safely operating a switchboard by protecting power devices in the switchboard by restoring the switchboard to its original state.

According to an aspect of the present invention, A case supporting member for fixing and supporting the lower portion of the switchboard case; A ground fixing member for fixing the case supporting member to the ground; An upper and lower vibration-absorbing member which is provided between the case supporting member and the ground fixing member and absorbs up-and-down vibration of the case of the switchboard when an up-down vibration occurs due to an earthquake; A warp preventing member provided between the case supporting member and the ground fixing member and preventing the case of the switchboard from being twisted when a vibration is generated in the composite direction due to an earthquake; And an anti-warp key that penetrates the case support member vertically and has a lower portion coupled to the anti-warp member so as to prevent the case support member from being warped in the lateral direction or the rotation direction. And a switchboard.

Preferably, the case supporting member includes a supporting plate on which the case of the power distribution board is seated; And a side plate protruding upward from a side of the support plate, wherein the support plate is formed with a slit-shaped fixing hole so as to be aligned with a coupling hole formed at a lower portion of the cabinet case in a state that the cabinet case is seated on the support plate, And a key for preventing distortion is coupled through.

Preferably, both sides of the ground fixing member are fixed to the ground by a bolt member. The center portion of the ground fixing member is bent upward so that the central portion is dome-shaped at a predetermined height from the ground to an upper portion. A receiving groove portion of a rectangular box structure is formed so as to protrude upward and a receiving groove in which the torsion preventing member is inserted and coupled is provided at the center of the receiving groove portion.

Preferably, the upper and lower vibration-absorbing members are radially provided with a plurality of vertical vibration-absorbing members spaced apart from each other between the case supporting member and the ground fixing member, wherein each of the upper and lower vibration- An elastic body fixed between a lower portion of the case supporting member and an upper portion of the ground fixing member by a penetrating bolt member; And a compression spring which is coupled to surround the outer circumferential surface of the elastic body and buffers the space between the case supporting member and the ground fixing member in the vertical direction.

Preferably, the torsion preventing member has a lower portion inserted into the receiving groove of the receiving groove portion and protruding to the upper portion of the receiving groove of the receiving groove portion, And a keyhole into which the lower portion is inserted and inserted is formed in a slit shape and is formed in a polygonal shape so as to be received in the receiving groove of the receiving groove portion in the lateral direction or the rotational direction while being accommodated in the receiving groove of the receiving groove portion.

Preferably, the anti-warp key includes a detachment preventing portion that is bent in a horizontal direction and inserted into a coupling hole of the switchboard case; And a warp preventing portion extending vertically downward from the release preventing portion and inserted into the keyhole of the warp preventing member after passing through the fixing hole of the case supporting member, Wherein the key is formed in a flat bar shape to be inserted into a hole and a keyhole of the torsion preventing member, and the torsion preventing key is made of a material having elasticity.

Preferably, the apparatus further comprises a rubber plate provided between the case of the switchboard and the case supporting member, wherein the rubber plate provides frictional force and elastic force between the case of the switchboard and the case supporting member, So as to be fixedly supported.

As described above, according to the present invention, earthquake-induced vibrations reaching the cabin in the horizontal direction and the vertical direction as well as in the combined direction are buffered when an earthquake occurs, and the distortion generated in the cabin is prevented and restored when the cabin is twisted It is possible to protect the power equipment inside the switchboard and to provide safe operation of the switchboard.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an switchboard having forward omnidirectional seismic performance according to an embodiment of the present invention; FIG.
2 is a view showing a state in which a switchboard case is separated from an switchboard having forward earthquake-proof performance shown in FIG. 1;
Fig. 3 is an exploded view of the switchboard shown in Fig. 1; Fig.
FIG. 4 is a cross-sectional view along the 'AA' perforation line shown in FIG. 1; FIG.
5 is a cross-sectional view illustrating an up-and-down vibration absorption process of an ASSC having an anti-seismic performance in all directions according to an embodiment of the present invention.
6 is a cross-sectional view for explaining a process of preventing a transverse warpage of an ASSEMBLY in a combined direction of an ASSEMBLY having an all-direction seismic performance according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various other forms.

The present embodiments are provided so that the disclosure of the present invention is thoroughly disclosed and that those skilled in the art will fully understand the scope of the present invention. And the present invention is only defined by the scope of the claims. Thus, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.

In addition, like reference numerals refer to like elements throughout the specification. Moreover, terms used herein (to be referred to) are intended to illustrate the embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

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

FIG. 1 is a view for explaining a switchboard having an anti-seismic performance in all directions according to an embodiment of the present invention. FIG. 2 shows a state in which the switchboard case is separated from the switchboard having the anti- FIG. 3 is an exploded view of the switchboard shown in FIG. 1, and FIG. 4 is a cross-sectional view along the 'AA' perforated line shown in FIG.

1 to 4, the switchboard 10 according to the embodiment of the present invention buffers the earthquake-induced vibration that reaches the cabin case 11 in the combined direction as well as the horizontal and vertical directions when an earthquake occurs, Directional seismic performance that can be prevented from being distorted in the direction and can be quickly restored to the original position even after the occurrence of the distortion. Accordingly, it is possible to prevent damage to various power devices installed in the cabinet case 11.

The switchboard case 11 is used to control and control various motors installed in buildings such as the operation and control of a power plant or a substation, a building such as a factory or a building, or a switch, an instrument, and a switch to distribute power supplied from a power plant or a substation to a necessary place And various relays (relays) and the like are installed inside. In FIGS. 1 to 4, only a part of the switchboard case 11 is shown, and its shape and structure are not limited.

As shown in Figs. 2 and 3, a coupling hole 11a is formed in a lower portion of the switchgear case 11 so as to penetrate vertically. At this time, the coupling hole 11a has a polygonal structure, for example, a rectangular structure.

In addition, a bolt member (not shown) is fixed to the lower portion and the one side of the case supporting member 12 in a state where the case 11 is seated on the upper portion of the case supporting member 12, a plurality of fastening holes 11b and 11c through which the first and second fasteners b1 are inserted are formed.

As shown in Figs. 3 and 4, the case supporting member 12 supports the switchboard case 11 which is seated on the top.

The case support member 12 has a substantially L-shaped cross section and includes a support plate 121 on which the switchboard case 11 is seated and a side plate 122 protruding upward from one side of the support plate 121 do.

The support plate 121 is formed with a slit-shaped fixing hole 121a which is aligned with the coupling hole 11a of the cabinet 11 and is vertically penetrated.

The support plate 121 is formed with a through hole 121b through which the bolt member B1 penetrated through the fastening hole 11b is aligned with the fastening hole 11b formed in the case 11 of the power distribution board. At this time, a through hole 121b may be provided with a washer w to improve fixing force.

The side plate 122 is formed with a fastening hole 122a so as to be horizontally aligned with a fastening hole 11c formed on one side of the case 11 of the power distribution board. Thus, as shown in Fig. 4, one side of the cabinet case 11 is supported and fixed to the side plate 122 through the bolt b3 and the nut n1.

As shown in Figs. 1 to 4, the case supporting member 12 is fixed to the ground by the ground fixing member 13. Fig.

The ground fixing member 13 is fixed to the ground by the bolt member b2 on both sides so as to partially absorb the vibration transmitted from the case supporting member 12. The center portion of the ground fixing member 13 protrudes upward, And can be formed in a substantially dome shape spaced apart.

In the upper part of the ground fixing member 13, a receiving groove 131 having a rectangular box structure, that is, a square box structure with an open top is formed. At this time, the receiving groove 131 protrudes upward from the upper center of the ground fixing member 13, and a receiving groove 131a is provided at the center thereof.

The ground fixing member 13 is formed with a fastening hole 13a for fastening the bolt member b1 on its upper portion and a through hole 13b through which the bolt member b2 passes is formed on both sides thereof .

3 and 4, the case supporting member 12 and the ground fixing member 13 are spaced apart from each other at regular intervals, and vibration or shock is generated in the vertical direction of the cabinet 11 by the earthquake And an up-down vibration-absorbing member 14 for absorbing the vibration is provided.

The upper and lower vibration absorbing members 14 are installed around the receiving groove 131 so that a plurality of the upper and lower vibration absorbing members 14 are spaced apart from each other between the case supporting member 12 and the ground fixing member 13. [ 3, the upper and lower vibration-absorbing members 14 are provided radially with respect to the receiving groove 131 in order to stably absorb vertical vibrations applied to the cabin case 11 when an earthquake occurs, as shown in Fig. For example, they are formed radially at intervals of 120 degrees around the receiving groove 131.

The upper and lower vibration absorbing members 14 are held between the lower portion of the case supporting member 12 and the upper portion of the ground fixing member 13 by the bolt member b1 passing through the through hole 121b of the case supporting member 12 And a compression spring 142 which is coupled to surround the outer circumferential surface of the elastic body 141 and buffers between the case supporting member 12 and the ground fixing member 13. [

The elastic member 141 is fixed between the case supporting member 12 and the ground fixing member 13 by the bolt member b1 with a hollow circular tube whose center in the longitudinal direction passes through the bolt member b1.

The elastic member 141 is made of any one material selected from a material having a certain elasticity, for example, a silicone material, a rubber material, or a urethane rubber material. When the case support member 12 is twisted in the lateral direction Thereby restoring the compression spring 142 against the vertical vibration more than the proper load while absorbing the vertical vibration and impact.

The compression spring 142 is a coil spring that stably absorbs the vertical vibration applied to the switchboard case 11 by buffering the space between the case supporting member 12 and the ground fixing member 13.

3, a torsion preventing member 15 made of a polyhedron is inserted in the receiving groove 131a of the receiving groove 131 to prevent the case supporting member 12 from being twisted in the horizontal direction.

As shown in Fig. 3, the anti-warp member 15 is formed in a polygonal shape so as to be latched in the receiving groove 131a in the lateral direction while being accommodated in the receiving groove 131a of the receiving groove 131 formed of polygonal. Preferably a rectangular parallelepiped corresponding to the shape of the receiving groove 131a.

It is preferable that the lower portion of the torsion preventing member 15 is inserted into the receiving groove 131a of the receiving groove 131 and the upper portion of the torsion preventing member 15 is protruded to the upper portion of the receiving groove 131a, A keyhole 15a is formed which is aligned with the through hole 121a of the case supporting member 12. [ At this time, the keyhole 15a is formed in a slit shape corresponding to the shape of the through hole 121a.

As shown in FIGS. 3 and 4, the lower portion of the anti-warp key 16 is inserted into the keyhole 15a so that the case supporting member 12 to which the switchboard case 11 is fixed is not warped in the lateral direction.

The anti-warp key 16 is formed in a substantially 'A' shape. The anti-warp key 16 is detachably inserted into the coupling hole 11a of the cabinet 11 by being bent in the horizontal direction. And a torsion preventing portion 162 extending vertically downward from the preventing portion 161 and inserted through the through hole 121a of the case supporting member 12 and then inserted into the keyhole 15a.

Since the anti-warp key 16 is formed in a flat bar shape so that the anti-warp portion 162 is inserted into the through-hole 121a and the keyhole 15a in the form of slits, even if a ground vibration occurs in the lateral direction It is possible to prevent the case support member 12 from being jammed by the anti-warp key 16, thereby preventing the case 11 from being warped.

The anti-warp key 16 according to the present invention may be made of any one material selected from a material having a certain elasticity such as an elastic material 141, for example, a silicone material, a rubber material, or a urethane rubber material It is possible not only to prevent warping but also to return to the home position quickly due to elasticity even after the switchgear case 11 is twisted.

2 and 3, a rubber plate 17 may be further provided on the upper portion of the case supporting member 12 on which the switchboard case 11 is mounted. The rubber plate 17 provides frictional force and elastic force between the switchboard case 11 and the case support member 12 to increase the adhesion between the switchboard case 11 and the case support member 12 so that the switchboard case 11 is stably fixed to the case support member 12 .

The rubber plate 17 is formed with a through hole 17a and a fastening hole 17b so that the coupling hole 11a and the coupling hole 11b formed in the cabinet 11 are aligned. A key 16 for preventing distortion is inserted into the through hole 17a and a bolt member b1 is inserted through the coupling hole 17b.

5 and 6 are diagrams for explaining the operating characteristics of the switchboard with forward omnidirectional seismic performance according to the embodiment of the present invention. And FIG. 6 is a cross-sectional view for explaining a process of preventing the transverse direction of the distribution board from being warped in the lateral vibration.

As shown in FIGS. 4 and 5, when vibrations or impacts are applied vertically due to an earthquake, they are firstly absorbed by the compression spring 142 of the vertical vibration absorption member 14, When the compression spring 142 is subjected to vibration more than the load, the vibration is absorbed by the elastic body 141 through the elastic body 141 so as to stably absorb the vibration in the vertical direction, and the compression spring 142 is prevented from being damaged .

The earthquake-induced vibrations are generated in the combined direction and the earthquake-induced vibrations are generated in the combined direction and the earthquake-induced vibrations of the earthquake-induced vibrations are generated in the combined direction and the earthquake- It is possible to prevent warpage of the switchboard case 11 by suppressing the warpage in the lateral direction and the rotational direction by the warpage prevention key 16 which is made of an elastic material, The key 16 and the elastic body 141 of the up and down vibration absorbing member 14 quickly return to the home position.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Switchboard 11: Switchboard case
11a: coupling holes 11b, 11c, 13a, 17b, 122a: fastening holes
12: case supporting member 13: ground fixing member
14: upper and lower vibration absorbing member 15:
16: key for preventing distortion 17: rubber plate
15a: Keyhole 121: Support plate
121a: Fixing holes 121b, 13b, 17a: Through holes
122: side plate 131: receiving groove
131a: receiving groove 141: elastic body
142: compression spring 161:
162: anti-warp portion b1, b2: bolt member
n1, n2: Nut member w: Washer

Claims (7)

And a plurality of coupling holes 11b and 11c through which the bolt member b1 is coupled to the radial position of the coupling hole 11a and one side of the coupling hole 11a, (11);
And a support plate 121 on which the switchboard case 11 is mounted so as to fix the lower portion of the switchboard case 11 in an L shape in a cross section and protrude upward from one side of the support plate 121 And a side plate 122 on which a fastening hole 122a is formed so as to be aligned in a horizontal direction with a fastening hole 11c formed on one side of the power distribution board case 11. The support panel 121 is provided with the power distribution board case 11, A case supporting member 12 having a fixing hole 121a formed in a slit shape so as to be aligned with a coupling hole 11a formed in a lower portion of the cabinet 11 in a state of being seated in the cabinet 11;
A ground fixing member 13 for fixing the case supporting member 12 to the ground;
An upper and lower vibration absorption member (14) provided between the case supporting member (12) and the ground fixing member (13) and absorbing up and down vibration of the switchboard case (11)
A torsion preventing member (15) provided between the case supporting member (12) and the ground fixing member (13) and preventing the switchboard case (11) from being twisted when a seismic vibration occurs in a composite direction due to an earthquake; And
An anti-warp key 16 penetrating the case supporting member 12 up and down and having a lower portion coupled to the anti-twist member 15 to prevent the case supporting member 12 from being twisted in the lateral or rotational direction, ; ≪ / RTI >
The ground fixing member (13)
And a through hole 13b through which the bolt member b2 passes is formed on both sides thereof. Both sides of the bolt member b2 are fixed to the ground by the bolt member b2. The central portion is bent upward, A receiving groove 131 of a square box structure having an open top is protruded upward from an upper portion of the central portion of the receiving groove 131. The torsion preventing member 15 is inserted into a center of the receiving groove 131, A receiving groove 131a is provided,
The upper and lower vibration absorbing member 14
A plurality of radially disposed centering on the receiving groove 131 so as to be spaced apart from each other between the case supporting member 12 and the ground fixing member 13,
Respectively,
An elastic body fixed to a lower portion of the case supporting member 12 and an upper portion of the ground fixing member 13 by a bolt member b1 vertically penetrating the case 11 and the case supporting member 12, (141); And
And a compression spring 142 coupled to the outer circumferential surface of the elastic body 141 to buffer the space between the case supporting member 12 and the ground fixing member 13 in the vertical direction,
The torsion preventing member 15
And a lower portion of the receiving groove 131 is inserted into the receiving groove 131a of the receiving groove 131 and protruded upward from the receiving groove 131a of the receiving groove 131, The keyhole 15a through which the lower portion of the anti-warp key 16 is inserted is formed in a slit shape. When the keyhole 15a is received in the receiving groove 131a of the receiving groove 131, (131a) of the receiving groove part (131)
The anti-warp key (16)
A separation preventing portion 161 bent in the horizontal direction and inserted into the coupling hole 11a of the switchboard case 11; And
And is inserted into the keyhole 15a of the torsion preventing member 15 after penetrating through the fixing hole 121a of the case supporting member 12 and extending vertically downward from the separation preventing portion 161. [ (162)
The torsion preventing portion 162 has a flat bar shape to be inserted into the fixing hole 121a of the case supporting member 12 and the keyhole 15a of the torsion preventing member 15,
Wherein the anti-warp key (16) is made of a material having elasticity.
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