JP2007037220A - Rainproof structure of wiring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the rainproof structure of a wiring apparatus which is more drip-proof with a simpler constitution. <P>SOLUTION: A drip-proof cover is equipped with a base 6 which is so fixed to a wall face as to surround the wiring apparatus 2 provided on the wall face, and a cover body 5 which is attached to the base 6 so that it may be possible to be opened and closed between a cover to cover the wiring accessories 2 and an open position to release the wiring apparatus 2. The base 6 is provided with an inwall 11 which is interposed between the cover body 5 in the cover position and the wiring apparatus 2, and a gap G1, which carries water by a capillary phenomenon is formed between the inwall 11 and another member (projection 6b) positioned on the opposite side of the wiring accessories from the inwall 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rainproof structure for a wiring device that protects the wiring device installed on a wall surface from water.

  As a rainproof structure for conventional wiring equipment, the base fixed to the wall surface surrounding the wiring equipment provided on the outdoor wall surface of buildings, etc., and the covering position and wiring equipment covering the wiring equipment are opened. A cover body attached to the base so as to be openable and closable with respect to the open position, and an inner wall that surrounds the periphery of the wiring device is provided on the base, thereby entering the inside of the cover body from the outside. There is known one that prevents water from being applied to the wiring device (for example, Patent Document 1).

Further, in order to further improve the drip-proof property, there is also known one provided with a packing on the edge of its inner wall.
JP 2000-31418 A

  However, if packing is provided on the inner wall, the number of parts increases, the manufacturing effort increases, and the manufacturing cost increases.

  Therefore, an object of the present invention is to obtain a rainproof structure for a wiring apparatus having a simpler configuration and higher drip-proof property.

  In the invention of claim 1, between the base fixed to the wall surface so as to surround the periphery of the wiring device provided on the wall surface, and the covering position for covering the wiring device and the open position for opening the wiring device. And a cover body attached to the base so as to be openable and closable in a rainproof structure for a wiring device, wherein the base has an inner wall interposed between the cover body and the wiring device at a covering position. And a gap for transferring water by capillary action is formed between the inner wall and another member positioned on the opposite side of the wiring device with respect to the inner wall.

  In the invention of claim 2, the gap extending in the lateral direction along the wall surface is formed above the wiring device, and water is transferred in the lateral direction along the wall surface by capillary action in the gap. It is characterized by that.

  In the invention of claim 3, the gap extending in a direction away from the wall surface is formed above the wiring device, and water is transferred in a direction away from the wall surface by capillary action in the gap. It is characterized by doing so.

  The invention according to claim 4 is characterized in that a water leakage passage is provided in which the amount of water entering the inner wall above the wiring device is asymmetrical.

  The invention according to claim 5 is characterized in that an end wall portion extending upward is formed at an edge of the inner wall formed above the wiring device on the side far from the wall surface.

  In the invention of claim 6, the cover body is formed with a notch fitted with a packing through which the wiring connected to the wiring device is inserted inside and outside the cover body, and the packing is formed inside the cover body. A rib for restricting bending is formed.

  The invention according to claim 7 is characterized in that an outer bulging portion extending in the vertical direction with a predetermined width is formed in a central portion in the lateral direction of the cover body.

  According to the first aspect of the present invention, water can be transported in a desired direction by forming a gap having a size sufficient to cause capillary action by the inner wall and another member. According to the configuration, the wiring apparatus can be protected from water.

  According to the invention of claim 2, since water can be transferred in the lateral direction along the wall surface above the wiring device, it is possible to suppress the water from being applied to the wiring device from above.

  According to invention of Claim 3, since water can be transferred to the direction spaced apart from a wall surface above a wiring device, it can suppress that a water splashes from above on a wiring device.

  According to the invention of claim 4, the right and left balance of water droplets is broken on the inner wall above the wiring device due to the difference in the amount of water that has entered, and water is prevented from staying on the inner wall due to surface tension. It is possible to suppress water from being applied to the instrument from above.

  According to invention of Claim 5, it can suppress that water approachs into the wiring apparatus side beyond the edge of the inner wall above a wiring apparatus by an end wall part.

  According to the invention of claim 6, it is possible to suppress the packing from being bent inward to form a gap between the wiring and to prevent water from entering the cover body via the gap. it can.

  According to the seventh aspect of the present invention, there is an advantage that the cover body can be easily held and can be easily opened and closed as much as the outer bulge portion can be used as the grip portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a view showing a state in which the cover body of the drip-proof cover according to the present embodiment is in the open position, FIG. 2 is a view showing a state in which the cover body is in the covering position, and FIG. 4 is an exploded perspective view of the cover, FIG. 4 is a front view of a part of the drip-proof cover and the wiring device (cross-sectional view taken along line BB in FIG. 5), and FIG. 5 is a side cross-sectional view of the drip-proof cover and the wiring device. 4 is a plan view of the drip-proof cover, FIG. 7 is a schematic view (front view) showing the upper part of the inner wall, and FIG. 8 is a perspective view of the connecting portion between the base and the cover body. 9 is a perspective view of the cover body, and FIG. 10 is a perspective view of the drip-proof cover. In the figure, UP indicates a vertically upward direction. In addition, a water transfer path is indicated by a dashed arrow as appropriate.

  A wiring device 2 is mounted on an outdoor wall surface (mounting wall surface) W of a building or the like. In order to protect the wiring device 2 from rainwater or water splashed, the wall surface W includes a wiring device. A drip-proof cover 1 covering 2 is attached. In the present embodiment, the wiring device 2 is configured as an outlet device into which a plug 4 attached to a wiring (power cable) 3 is inserted. The drip-proof cover 1 and the wiring device 2 are both fixed to the storage box 18 embedded in the wall using screws or the like.

  The drip-proof cover 1 basically includes a base 6 fixed to the wall surface W so as to surround the wiring device 2, a covering position (FIG. 2) that covers the wiring device 2, and an opening that opens the wiring device 2. And a cover body 5 attached to the base 6 so as to be openable and closable with respect to the position (FIG. 1). In the present embodiment, the surface 6 a of the plate-like base 6 along the wall surface W is covered with the cover body 5 that is bulged and formed, and surrounded by the surface 6 a of the base 6 and the inner surface of the concave portion of the cover body 5. An internal space is formed. The drip-proof cover 1 is basically configured so that water does not enter the internal space from the outside as much as possible. However, in order to obtain more reliable drip-proof properties, the drip-proof cover 1 is also provided with a mechanism for discharging the entered water. Yes.

  The cover body 5 and the base 6 are preferably formed by molding a synthetic resin having good weather resistance into a predetermined shape. Further, if at least a part of the cover body 5 is transparent, there is an advantage that the connection state of the wiring in the wiring device 2 can be visually recognized without opening the cover body 5.

  In this embodiment, the upper portion of the cover body 5 extends above the wiring device 2 in the lateral direction along the wall surface W (substantially horizontal direction when fixed to the wall surface W) (FIG. 3). 4 is pivotally supported on the upper portion of the base 6 via a hinge mechanism 16 (FIG. 4). When the cover body 5 is lifted upward, the base 6 and The wiring device 2 is configured to be exposed.

  The cover body 5 is biased in the closing direction by the coil spring 10 (FIG. 3), and when the hand holding the cover body 5 is released, the cover body 5 is moved from the open position (FIG. 1) to the covering position by the biasing force of the coil spring 10. Return to FIG. With this configuration, a situation in which the cover 5 is left open and water is applied to the wiring device 2 is suppressed.

  Further, a notch 5i is formed in the lower portion of the cover body 5. When the cover body 5 is in the covering position, an insertion port for the wiring 3 is formed by the notch 5i and the lower end portion of the base 6. It is like that. A packing 8 is attached to the notch 5i so as to suppress the entry of water.

  Further, a frame-shaped packing 7 (FIG. 3) is interposed between the base 6 and the wall surface W, thereby suppressing water from entering between the base 6 and the wall surface W into the internal space. . The wiring device 2 protrudes from the surface 6 a of the base 6 in a state where a part thereof is inserted into a substantially rectangular opening 6 d formed at the center of the base 6.

  The hinge mechanism 16 has a configuration as shown in FIG. That is, the protrusion 6b formed on the upper end of the base 6 is fitted into the notch 5c provided in the upper wall 5b of the cover body 5, and the through holes formed in the upper wall 5b and the protrusion 6b. By inserting the rotation shaft 9 so as to penetrate 5d and 6c, a configuration is obtained in which the base 6 and the cover body 5 can relatively rotate about the rotation shaft 9 as a rotation center. A coil spring 10 is wound around the rotating shaft 9, and the cover body 5 is urged in a closing direction with respect to the base 6 by the coil spring 10. In the present embodiment, the coil spring 10 is disposed at a substantially central portion in the lateral direction of the base 6, and a fitting portion between the notch portion 5c and the protruding portion 6b is disposed so as to sandwich the coil spring 10 from both the left and right sides. .

  In this type of drip-proof cover 1, it is difficult to completely prevent water from entering the internal space of the drip-proof cover 1 from the gap between the boundary portions of the cover body 5 and the base 6. In particular, when the hinge mechanism 16 is provided above the drip-proof cover 1 as in this embodiment, as shown in FIG. 6 and the like, the upper wall portion 5b (notch portion 5c) of the hinge mechanism 16 and the projection portion 6b are formed. There is a case where a gap is formed, and water stays above the gap, and the water enters the internal space through the gap between the base 6 and the cover body 5 from above. Therefore, in the present embodiment, the inner wall 11 is interposed between the wiring device 2 and the cover body 5, and specifically, on the surface 6 a of the base 6, in a plan view surrounding the upper side and the side of the wiring device 2. By standing the substantially C-shaped inner wall 11, the water that has entered the drip-proof cover 1 is blocked and drained away from the wiring device 2. Note that the upper wall portion 11a is not a completely flat surface, but is gently inclined downward from the central portion to the side to enhance the water discharge performance. Further, the lower portion of the inner wall 11 is notched for inserting the wiring 3.

  Furthermore, in this embodiment, between this inner wall 11 and another member (a part other than the inner wall 11 of the cover body 5 or the base 6) located on the opposite side of the wiring device 2 with respect to the inner wall 11. By forming gaps G1 (FIG. 4) and G2 (FIG. 5) of appropriate sizes and causing capillarity in the gaps G1 and G2, water is transferred in the desired direction and drainage is promoted. Like to do.

Specifically, as shown in FIG. 4, the upper wall portion 11 a of the inner wall 11 and the upper wall portion 5 b of the cover body 5.
A strip-shaped gap G1 extending in the lateral direction along the wall surface W (substantially horizontal direction in the present embodiment) is formed between the water and the water in the lateral direction along the wall surface W. The size of the gap G1 is appropriately set according to the water repellency of the upper wall portions 5b and 11a, the amount of water entering the inner wall 11, and the like. A fine groove or protrusion along the extending direction of the inner wall 11 may be provided on the upper surface of the upper wall portion 11a or the lower surface of the upper wall portion 5b to promote drainage along the extending direction of the gap G1. The water transferred through the gap G1 descends on the side wall portion 11c of the inner wall 11.

  Further, as shown in FIG. 5, the upper wall portion 11 a of the inner wall 11 and the protruding wall portion 11 b projecting in a direction away from the wall surface W from the upper wall portion 11 a and the upper wall portion 5 b of the cover body 5 In addition, a gap G2 extending in a direction away from the wall surface W (substantially horizontal direction in the present embodiment) is formed, and water is transferred in a direction away from the wall surface W. The size of the gap G2 is also appropriately set according to the water repellency of the upper wall portion 5b, the upper wall portion 11a, and the protruding wall portion 11b, the amount of water entering the inner wall 11, and the like. It should be noted that fine grooves or protrusions along the extending direction of the inner wall 11 are provided on the upper surface of the upper wall portion 11a and the protruding wall portion 11b or the lower surface of the upper wall portion 5b so as to promote drainage along the extending direction of the gap G1. It may be.

  Here, in the present embodiment, the tip of the protruding wall portion 11b is extended to the vicinity of the boundary between the upper wall portion 5b of the cover body 5 and the top wall portion 5e of the outer bulging portion 17, and is transferred through the gap G2. The water is lowered along the inner surface of the cover body 5 (the inner surface of the top wall portion 5e). By carrying out like this, it can suppress more reliably that the wiring appliance 2 splashes water, and also can make a drainage path | route secure with a simple structure by making the inner surface of the top wall part 5e propagate.

  In the present embodiment, the shape of the upper wall portion 11a is asymmetrical. FIG. 7 is a front view showing the upper wall portion 11a exaggerated in the vertical direction. Specifically, as shown in FIG. 7, a position M1 that is the apex of the convex shape of the upper wall portion 11a is The drip-proof cover 1 (base 6) is shifted to the left by the distance δ from the lateral center M.

  When water enters the upper wall portion 11a, water drops may be formed on the upper wall portion 11a due to the surface tension. However, according to the left-right asymmetric structure of the present embodiment, the upper surface of the upper wall portion 11a. Since the inclination of the right and left is different, the right and left balance of water droplets on the upper wall portion 11a is lost due to gravity, and water is prevented from staying on the upper wall portion 11a due to surface tension. This can be suppressed.

  Furthermore, in the present embodiment, a water leakage passage is provided that makes it easy to allow water to enter the upper wall portion 11a from the outside of the drip-proof cover 1, so that the amount of water entering the upper wall portion 11a is asymmetric. ing.

  Specifically, a gap between the notch portion 5c (upper wall portion 5b) of the hinge mechanism 16 and the protruding portion 6b is formed as a water leakage passage at a position to the right of the central portion in the lateral direction of the upper wall portion 5b in front view. A notch 5h (FIG. 8) communicating with the inside of the drip-proof cover 1 is formed. By increasing the amount of water entering from the notch 5h, as shown in FIG. The amount is increased compared to the left side.

  By doing so, the right and left balance of the water droplets on the upper wall portion 11a is broken due to the difference in the amount of water that has entered, and water is prevented from staying on the upper wall portion 11a due to surface tension. It is possible to suppress water from above.

  Further, in such a configuration, an inclined surface that continuously inclines in a certain direction over a wider section is formed on the upper wall portion 11a at a position where more water enters, and water is generated by gravity. It is preferable to promote the flow of water and more reliably suppress the formation of water droplets.

  In the present embodiment, this notch 5h is formed only on the inner surface side of the cover body 5, and as shown in FIG. 6, it cannot be determined that the notch 5h is formed in appearance. Further, when the notch 5h is expanded to the outer surface side of the cover body 5, there is a concern that the expanded gap is exposed, and there is a concern about the ingress and clogging of dust, but the notch 5h is covered with the cover body 5 as in this embodiment. This can be suppressed by keeping it on the inner surface.

  On the other hand, in the present embodiment, as described above, the packing 8 for suppressing the ingress of water is attached to the notch 5i formed in the lower portion of the cover body 5. The packing 8 includes a frame portion 8a fitted into the notch 5i, and a flange portion 8b formed by vertical and horizontal cuts 8c inside the frame portion 8a. The wiring portion 3 is inserted through the flange portion 8b. By deforming along the peripheral wall, the sealing performance is enhanced.

  Furthermore, as shown in FIG. 9, plate-like ribs 15 are provided at positions adjacent to the upper side of the packing 8 at the lower part of the cover body 5 (that is, the inside of the cover body 5). 5 is restricted to bend in the inner direction (the inner space side of the drip-proof cover 1). Thereby, it is possible to suppress water from entering along the packing 8 bent inward, and the water 15 is also suppressed by the rib 15 itself. The rib 15 is provided with a notch 15a through which the wiring 3 is inserted. The extending direction of the wiring 3 is regulated by the notch 15a, the wiring 3 is bent greatly at the packing 8 portion, and the notch 8c is expanded and sealed. It can suppress that sex deteriorates.

  In the present embodiment, as shown in FIGS. 9 and 10, an engagement mechanism that engages the cover body 5 and the base 6 is provided adjacent to the notch 5i. Specifically, engaging protrusions 13 and 13 are provided at the corners on the left and right sides of the notch 5i on the base 6 side, while the base 6 is provided with engaging recesses 14 and 14 corresponding thereto. The engagement protrusion 13 and the engagement recess 14 are configured to engage with each other. The region adjacent to the notch 5i is liable to bend due to a decrease in rigidity, and the notch 5i and thus the packing 8 is likely to be deformed. By providing such an engagement mechanism, it is possible to suppress a decrease in the rigidity of this portion. Can do. Further, the gap of the engagement mechanism can be used as a discharge port for discharging water from the inside of the drip-proof cover 1.

  Further, in the present embodiment, as shown in FIG. 10, an outer bulging portion 17 extending in the vertical direction and bulging outward from the outer wall portion 5 a with a predetermined width is formed at the lateral center of the cover body 5. . The outer bulging portion 17 has a substantially U-shaped cross section by a top wall portion 5e extending vertically in a strip shape with a predetermined width (about 1/3 of the width of the cover body 5) and side wall portions 5f on both sides thereof. It is formed in a shape. The top wall portion 5e gradually rises from the upper edge of the outer wall portion 5a, and its height gradually increases in a parabolic manner from the upper part to the central part, and is almost constant from the central part to the lower part. It has become. Further, an anti-slip portion 12 made of minute irregularities (for example, streaky or dotted irregularities) is provided on the surface of the side wall 5f.

  With this configuration, the outer bulging portion 17 can be lifted to easily open the cover body 5. Further, the cover body 5 can be gripped more reliably by the amount of the anti-slip portion 12 provided.

  Moreover, since the upper end part of the top wall part 5e of the outer side bulging part 17 was brought close to the wall surface W, as shown in FIG. 5, the protruding wall part 11b of the inner wall 11 is connected to the top wall part 5e at the upper end part of the top wall part 5e. It becomes easy to approach to the upper end of the top wall, and the inner surface of the top wall 5e can be secured as a drainage path. Further, by gently moving the top wall portion 5e away from the upper end of the wall surface W side, that is, from the wiring device 2 side, water can be transmitted more reliably on the inner surface of the top wall portion 5e, so that the water is transmitted to the wiring device 2. Can be suppressed.

  According to the above embodiment, the gap G1, G2 having such a size as to cause capillary action is formed by the inner wall 11 and a member (upper wall portion 5b) different from the inner wall 11, thereby allowing water to flow. Since it can be transported in the intended direction, the wiring device 2 can be protected from water by a simpler configuration.

  Further, according to the present embodiment, the water that has entered the inner wall 11 (upper wall portion 11a) is distributed above the wiring device 2 in the lateral direction along the wall surface W and in the direction away from the wall surface W. Since it can transfer, it can suppress more reliably that water splashes on the wiring appliance 2 from upper direction.

  In addition, according to the present embodiment, the left / right balance of the amount of water entering the inner wall 11 (upper wall portion 11a) is made to break the left / right balance of water droplets on the upper wall portion 11a and It is possible to suppress water from being retained by the surface tension, and to prevent water from being applied to the wiring device 2 from above.

  In addition, according to the present embodiment, the left / right balance of the water droplets on the upper wall portion 11a is lost due to the left / right difference in the shape of the inner wall 11 (upper wall portion 11a) above the wiring device 2, and on the upper wall portion 11a. It is possible to suppress water from being retained by the surface tension, and to prevent water from being applied to the wiring device 2 from above.

  Further, according to the present embodiment, the rib 8 prevents the packing 8 from being bent inward to form a gap between the wiring 3 and the interior of the drip-proof cover 1 via the gap. Water can be prevented from entering.

  In addition, according to the present embodiment, since the engagement mechanism for engaging the cover body 5 and the base 6 is provided adjacent to the notch 5i, the notch 5i and thus the packing 8 are not easily deformed. It is possible to prevent water from entering the internal space from the gap with the third.

  Moreover, according to this embodiment, since the outer bulging part 17 can be used as a holding part, there exists an advantage that it becomes easy to hold the cover body 5, and it becomes easy to open and close. Further, the inside of the outer bulging portion 17 having a substantially U-shaped cross section becomes a groove for discharging water downward, so that water can be discharged more reliably. The width of the outer bulging portion 17 is preferably an appropriate size that is easy to hold.

  Further, according to the present embodiment, the cover body 5 can be more reliably held by the amount of the anti-slip portion 12 provided on the outer bulging portion 17. In particular, when the outer bulging portion 17 is provided and the cover body 5 is made of a transparent material, the anti-slip portion 12 is formed on the side wall portion 5f of the outer bulging portion 17 through the anti-slip portion 12. There is an advantage that even if the see-through property is reduced, the internal connection state can be visually recognized from the top wall portion 5e, so that it is less likely to cause a visual obstacle.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in the above-described embodiment, a case where a power outlet device is provided as a wiring device is illustrated, but instead of this, a switch, a wiring device for connecting other wiring, or the like may be configured.

  Also, the shape of the drip-proof cover can be variously modified. For example, although the cover body is vertically opened in the above-described embodiment, it may be horizontally opened, and can also be implemented when the wiring introduction position (the position of the notch 5i) is set to a position other than the lower central portion.

  Further, in the above embodiment, the gap for transferring water using the capillary action is formed above the wiring device, but the same gap is also formed in other parts such as the side and the lower side of the wiring device. Also good.

  Moreover, it is good also as a water leak path | route by expanding the clearance gap in a hinge mechanism in part.

  Further, as in the base 6A shown in FIG. 11, an end wall portion 11d extending upward is provided at the end edge of the upper wall portion 11a far from the wall surface W, and the lower side of the upper wall portion 11a extends beyond the end edge. You may make it suppress that water enters. Even with such a configuration, the suitable performance can be improved relatively easily without providing packing or the like.

The perspective view which shows the state which has the cover body of the drip-proof cover concerning embodiment of this invention in an open position. The perspective view which shows the state which has the cover body of the drip-proof cover concerning embodiment of this invention in a covering position. 1 is an exploded perspective view of a drip-proof cover and a wiring device according to an embodiment of the present invention. The front view of a part of drip-proof cover concerning embodiment of this invention, and a wiring apparatus (BB sectional drawing of FIG. 5). Side sectional drawing (AA sectional drawing of FIG. 4) of the drip-proof cover and wiring apparatus concerning embodiment of this invention. The top view of the drip-proof cover concerning the embodiment of the present invention. The schematic diagram (front view) which shows the upper part of the inner wall of the drip-proof cover concerning embodiment of this invention. The perspective view of the connection part of the base of a drip-proof cover concerning an embodiment of the present invention, and a cover body. The perspective view of the cover body of the drip-proof cover concerning the embodiment of the present invention. The perspective view of the drip-proof cover concerning the embodiment of the present invention. The front view (a) and side view (b) of the base of the drip-proof cover concerning another embodiment of the present invention.

Explanation of symbols

1 drip-proof cover 2 wiring device 3 wiring 5 cover body 5h notch (water leakage passage)
6, 6A Base 8 Packing 9 Rotating shaft 11 Inner wall 11d End wall portion 12 Non-slip portion 15 Rib 16 Hinge mechanism 17 Outer bulging portion G1, G2 Gap W Wall surface

Claims (7)

The base is fixed so that it can be opened and closed between a base fixed to the wall surface so as to surround the wiring device provided on the wall surface, and a covering position for covering the wiring device and an open position for opening the wiring device. In the rainproof structure of the wiring apparatus provided with the attached cover body,
The base is provided with an inner wall interposed between the cover body and the wiring device in the covering position,
A rainproof structure for a wiring device, wherein a gap for transferring water by capillary action is formed between the inner wall and another member located on the opposite side of the wiring device with respect to the inner wall.   The gap extending in the lateral direction along the wall surface is formed above the wiring device, and water is transferred in the lateral direction along the wall surface by capillary action in the gap. Item 7. A rainproof structure for a wiring device according to Item 1.   The gap extending in a direction away from the wall surface is formed above the wiring device, and water is transferred in a direction away from the wall surface by capillary action in the gap. The rainproof structure of the wiring device according to 1 or 2.   The rainproof structure for a wiring device according to claim 2 or 3, wherein a water leakage passage is provided that makes the amount of water entering the inner wall above the wiring device asymmetrical.   The end wall part extended upward is formed in the edge of the side far from the said wall surface of the said inner wall formed above a wiring apparatus, The Claim 1 characterized by the above-mentioned. Rainproof structure for wiring equipment.   The cover body is formed with a notch fitted with a packing through which the wiring connected to the wiring device is inserted inside and outside the cover body, and a rib is formed to restrict the packing from bending inside the cover body. The rainproof structure for a wiring device according to any one of claims 1 to 5. The rainproofing of the wiring apparatus according to any one of claims 1 to 6, wherein an outer bulging portion extending in a vertical direction with a predetermined width is formed in a lateral central portion of the cover body. Construction.

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