JP5421050B2 - Box cover and wiring box device - Google Patents

Description

  The present invention relates to a box cover that is attached to a wiring box in order to install a wiring device on a building wall, and a wiring box device in which the box cover is attached to the wiring box.

  In order to install wiring appliances such as outlets on the building wall, a wiring box having a bottomed square box shape with one side opening is installed on the back of the wall, and a box cover is attached to the opening side of this wiring box ( For example, see Patent Document 1). The box cover of Patent Document 1 has a frame shape, and an opening is formed at the center. Then, when installing the wiring device, in order to make the entire surface of the box cover opening installed on the back of the wall face the wall surface, an electric punching device is provided at a portion corresponding to the opening of the box cover in the wall material. Through holes are drilled.

JP 2005-253238 A

  However, in the state in which the box cover of Patent Document 1 is installed on the back of the wall, the entire one surface (front surface) of the box cover is in close contact with or slightly separated from the back surface of the wall material. For this reason, when drilling a through-hole in a wall material using an electric drill, the drilling blade may come into contact with one surface of the box cover.

  The present invention has been made paying attention to such problems existing in the prior art, and the object thereof is to avoid contact with a drilling blade when drilling a through hole in a wall material. The object is to provide a box cover and a wiring box device.

In order to achieve the above object, the invention according to claim 1 is attached to a wiring box having a bottomed box shape that is installed on the back of a wall of a building and has an opening on one side thereof. A flat plate portion that closes the portion, a mounting portion that fixes a mounting frame that holds the wiring device , and a through hole that faces the opening to the wall surface, and the abutting portion can abut against the back surface of the wall material In the box cover in which the through hole and the attachment portion face the wall surface by a through hole formed in the wall material by a punching tool, the periphery of the through hole is larger than the through hole. The gist is that an escape portion for avoiding contact with the drilling blade is provided in a portion corresponding to the trajectory of the drilling blade in the drilling tool so as to be recessed from the contact portion.

  Here, “the part corresponding to the trajectory of the drilling blade” is slightly shifted from the part that completely matches the trajectory of the drilling blade and the part that completely matches the trajectory of the drilling blade to at least one of the inside and the outside of the trajectory. This refers to the part including the position.

  According to a second aspect of the present invention, in the first aspect of the invention, a plurality of protrusions are provided on one end surface of the flat plate portion outside a portion corresponding to the locus, and a tip end surface of the protrusion portion. The abutment portion is formed by the above, and the relief portion is formed of a region inside the position where the projection portion is provided.

The gist of the invention described in claim 3 is that, in the invention described in claim 2, the protrusion is provided so as to surround the locus.
The gist of the invention according to claim 4 is that, in the invention according to claim 2 or 3, the protrusion is provided so as to be along the peripheral edge of the locus.

  According to a fifth aspect of the present invention, in the first aspect of the invention, the contact portion is formed by one end surface of the flat plate portion, and the escape portion is formed by a concave portion recessed from one end surface of the flat plate portion. Is the gist.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a protrusion projecting from the other end surface is formed on the other end surface of the flat plate portion. The gist is that it is formed so as to polymerize in the formed region.

  The invention according to claim 7 is the invention according to claim 1, wherein the contact portion is formed of a tip end surface of a coating portion that is provided upright from one end surface of the flat plate portion and surrounds the through hole, and The gist is that the escape portion comprises a recess that is recessed from the tip end surface of the coating allowance portion.

  The invention according to claim 8 is the invention according to any one of claims 5 to 7, wherein the recess is recessed until reaching the through hole from a portion corresponding to the locus of the drilling blade. This is the gist.

  The invention according to claim 9 is the invention according to claim 8, wherein a member to be detected for detecting a reference of a drilling position from the wall surface is attached in the recess, and the depth direction of the recess is The gist is that the length is the same as or slightly longer than the length of the detected member in the thickness direction.

  The invention according to claim 10 has a wiring box having a bottomed box shape that is installed on the back of a building wall and has an opening on one side, and a through-hole that allows the opening to face the wall surface. A box cover provided with a flat plate portion that is attached to the wiring box and closes a part of the opening, and the box cover is provided with a mounting hole, and a boss hole is formed on one end surface in the wiring box. Is a wiring box device in which the box cover and the wiring box are assembled to each other by fastening a fastening member to the boss hole via the mounting hole. One end surface of the boss portion is provided at a position that is recessed toward the bottom side of the opening end surface of the wiring box, and the box cover is arranged so as to enter the wiring box. Is, one end surface of said plate is summarized in that that retreated to the bottom side of the opening end face.

  According to the present invention, contact with the drilling blade can be avoided when the through hole is drilled in the wall material.

The perspective view which shows the wiring box and box cover in 1st Embodiment. (A) is a front view of a box cover, (b) is the sectional view on the AA line in FIG. 2 (a). Sectional drawing which shows the state in which the wiring box and the box cover were installed in the wall back. The partial perspective view which shows an electric punch. The front view which shows the state by which the through-hole was drilled in the wall material. Sectional drawing which shows the state by which the electrical outlet was installed in the wall. (A) is a front view which shows the box cover in 2nd Embodiment, (b) is the BB sectional drawing in Fig.7 (a). (A) The disassembled perspective view of the wiring box apparatus in 3rd Embodiment, (b) is a perspective view which shows a wiring box apparatus. (A) is a front view which shows the box cover in another embodiment, (b) is CC sectional view taken on the line in Fig.9 (a). (A) is a perspective view which shows the wiring box and box cover in another embodiment, (b) is a perspective view which shows the state by which the box cover was attached to the wiring box. (A) is a front view which shows the box cover in another embodiment, (b) is the DD sectional view taken on the line in Fig.11 (a).

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, the terms “front-rear direction”, “vertical direction”, and “left-right direction” refer to “front-rear direction”, “vertical direction”, and “left-right direction” indicated by arrows in FIG. Direction ".

  As shown in FIG. 1, the box cover 11 made of synthetic resin is used by being attached to the opening side of a wiring box 21 having a bottomed square box shape having an opening 21a on the front surface (one surface). Note that the box cover 11 described in the present embodiment is used by fixing only one mounting frame 36 (see FIG. 6) holding an outlet 35 as a wiring device installed on a building wall.

First, the wall W on which the wiring box 21 and the box cover 11 are installed will be described.
As shown in FIG. 3, the wall W is configured by a column W1 and a pair of wall members W2 that are erected on both front and rear surfaces of the column W1. A hollow portion W3 is formed between the pair of wall materials W2, and a heat insulating member (not shown) such as a foamed polystyrene plate, glass wool, or a hard foamed urethane plate is provided in the hollow portion W3.

Next, the box cover 11 will be described.
As shown in FIGS. 2A and 2B, the box cover 11 includes a rectangular frame-shaped flat plate portion 12 that closes a part of the opening portion 21 a of the wiring box 21, and is provided at the central portion of the flat plate portion 12. A through hole 14 is formed. The through hole 14 has an elongated rectangular shape extending in the vertical direction of the box cover 11 when viewed from the front.

  The front end surface 12a (one end surface) of the flat plate portion 12 constitutes a contact portion that can contact the back surface of the wall material W2. Further, as shown in FIG. 2 (b), the rear end surface 12 b (the other end surface) of the flat plate portion 12 protrudes rearward from the rear end surface 12 b from the outer peripheral portion of the through hole 14 toward the inside of the through hole 14. A protruding portion 18 that protrudes is formed. The thickness of the protruding portion 18 is the same as the thickness of the flat plate portion 12. The “thickness of the flat plate portion 12” refers to the thickness from the front end surface 12a to the rear end surface 12b of the flat plate portion 12.

  The entire front end surface (one end surface) of the protruding portion 18 is formed at a position retracted from the front end surface 12a of the flat plate portion 12, and as a result, a recess is formed around the through hole 14 so as to be recessed from the front end surface 12a. 13 is provided. When viewed from the front, the recess 13 has an oblong shape extending in the vertical direction of the box cover 11. The recess 13 is formed so as to overlap with the region where the protrusion 18 is formed. The depth of the concave portion 13 is the same as the thickness of the flat plate portion 12. Further, as shown in FIG. 2A, the width from the outer peripheral edge to the inner peripheral edge along the vertical direction of the concave portion 13 in both the upper and lower portions of the protruding portion 18 is the concave portion 13 in both the left and right portions of the protruding portion 18. It is longer than the width from the outer peripheral edge to the inner peripheral edge along the left-right direction. Further, the recess 13 has the same depth in the entire region from the outer peripheral edge to the inner peripheral edge.

  At the center of the upper and lower inner edge portions of the projecting portion 18, there is provided a mounting portion 15 having a substantially cylindrical shape that bulges into the through hole 14 and extends in the front-rear direction. As shown in FIG. 5, a magnet M as a member to be detected is mounted in the recess 13 using the mounting portion 15 and the protruding portion 18. The magnet M is fixed to the central portion of the attachment piece M1 having an elongated plate shape, and does not protrude from the front surface of the attachment piece M1. In addition, protrusions (not shown) that can be fitted into the holes of the attachment portion 15 are formed at both ends of the attachment piece M1. By fitting this protrusion into the hole of the attachment portion 15 and supporting both ends of the attachment piece M1 on the protruding portion 18, the attachment piece M1 is attached to the attachment portion 15 and the magnet M is an abbreviation of the through hole 14. It is located in the center. The length in the depth direction of the concave portion 13 is the same as or slightly longer than the length in the thickness direction of the mounting piece M1, and when the mounting piece M1 is attached to the mounting portion 15, the mounting piece M1 and the magnet M Is prevented from protruding beyond the front end face 12a. In addition, attachment holes 16 extending in an arc shape are formed at four corners of the flat plate portion 12.

Next, the wiring box 21 will be described.
As shown in FIG. 1, the wiring box 21 is formed in the shape of a bottomed square box having an opening 21a on the front surface (one surface) of a synthetic resin material. Specifically, the wiring box 21 is formed by a bottom wall 22 having a substantially rectangular shape and four side walls 23 erected from the periphery of the bottom wall 22.

  Boss portions 25 are provided on the inner surfaces of the upper side wall 23 and the lower side wall 23, respectively. The boss portion 25 is provided at a position corresponding to the mounting hole 16 of the box cover 11, and a boss hole 25 a is formed in the front end surface 25 b (one end surface) of each boss portion 25. The front end face 25 b of the boss portion 25 is provided so as to be located on the same plane as the open end face 21 b of the wiring box 21.

  The box cover 11 having the above configuration inserts a screw 29 as a fastening member into the boss hole 25a of the boss portion 25 through the attachment hole 16 and fastens the boss portion 25 to the opening end surface 21b of the wiring box 21. It is attached. Then, a part of the opening 21 a in the wiring box 21 is closed by the flat plate portion 12 of the box cover 11.

  The wiring box 21 and the box cover 11 configured as described above are installed behind the wall W. As shown in FIG. 5, in order for the through hole 14 of the box cover 11 installed on the back of the wall W to face the surface of the wall W, a through hole Wa is formed in the wall material W2. The through hole Wa is drilled in the wall material W2 so as to form a vertically long elliptical shape that extends in the vertical direction using an electric drill 30 as a punch.

  As shown in FIG. 4, the electric punch 30 includes a cup-shaped casing 31 whose one end has a vertically long elliptical shape, and a shaft cylinder 32 is attached to the other end of the casing 31. A spindle (not shown) is rotatably supported on the shaft cylinder 32, and a drilling blade 33 is attached to one end of the spindle through a drive mechanism (not shown) disposed in the casing 31, An electric drill 34 as a drive source is attached to the other end of the main shaft.

  The drilling blade 33 is disposed in the casing 31 and rotates in a vertically long elliptical shape along the inner peripheral surface of the casing 31. The perforating blade 33 is made of an endless metal plate having a spring property, and one end side of the metal plate is attached to the drive mechanism, and a blade portion 33a is formed on the other end side of the metal plate. The blade portion 33 a of the punching blade 33 is exposed to the outside of the casing 31 through an opening on one end side of the casing 31. And the front-end | tip of the blade part 33a is contact | abutted to the front surface of wall material W2, and the drilling blade 33 is rotated with the electric drill 34. FIG. As shown by a two-dot chain line in FIG. 2A, the trajectory H of the drilling blade 33 has a vertically long elliptical shape, and when one end surface of the casing 31 comes into contact with the surface of the wall material W2, the drilling blade 33 is used. The blade portion 33a penetrates the thickness of the wall material W2 and slightly protrudes from the back surface of the wall material W2.

  The length H1 in the long side direction (vertical direction) of the trajectory H of the punching blade 33 is slightly shorter than the length L1 in the long side direction (vertical direction) of the outer peripheral edge of the recess 13. Further, the length H2 in the short side direction (left and right direction) of the trajectory H of the punching blade 33 is slightly shorter than the length L2 in the short side direction (left and right direction) of the outer peripheral edge of the recess 13. For this reason, when the trajectory H of the drilling blade 33 is formed around the magnet M, the trajectory H passes through the recess 13 of the flat plate portion 12.

  The length in the depth direction of the concave portion 13 is slightly longer than the protruding length of the drilling blade 33 from the back surface of the wall material W2. For this reason, even if the piercing blade 33 passes through the recess 13, the piercing blade 33 does not contact the protrusion 18 in the recess 13. That is, the concave portion 13 functions as a relief portion for avoiding contact between the flat plate portion 12 and the drilling blade 33. Further, the recess 13 has the same depth in the entire region from the outer peripheral edge to the inner peripheral edge, and is recessed on the outer peripheral side from the locus H of the drilling blade 33 and from the locus H to the through hole 14. Is formed. The entire circumference of the recess 13 is covered with the front end surface 12 a of the flat plate portion 12 without opening outward of the flat plate portion 12. Therefore, in the flat plate portion 12, the entire area outside the recess 13 is a contact surface.

  Now, in order to install the wiring box 21 and the box cover 11 on the wall W and to install the outlet 35 as a wiring device on the wall W using the wiring box 21 and the box cover 11, first, the wiring box 21 is placed on the column W1. On the other hand, it is arranged at a desired position. Here, the “desired position” is a position where the front end face 12a is flush with the front face of the pillar W1 when the box cover 11 is attached to the wiring box 21 fixed to the pillar W1. Next, a fixing screw is inserted into a screw hole (not shown) formed in the wiring box 21 and the fixing screw is forcibly screwed into the column W1. As a result, the wiring box 21 is fixed to the pillar W1.

  Next, the box cover 11 is arranged on the opening side of the wiring box 21, and the box cover 11 is attached to the opening side of the wiring box 21 by fastening the screw 29 to the boss portion 25 through the attachment hole 16. Subsequently, the attachment piece M <b> 1 is attached to the attachment portion 15, and the magnet M is disposed in the recess 13. Further, the pair of wall materials W2 are erected on the front and rear sides of the wiring box 21 and the box cover 11, so that the wiring box 21 and the box cover 11 are installed on the back side of the wall W, and the front end surface 12a is the back surface of the wall material W2. It will be in the state contacted.

  Next, the position of the magnet M is detected from the surface of the wall W using a magnet detector (not shown), and the positions of the wiring box 21 and the box cover 11 are detected. Further, the drilling blade 33 of the electric drilling tool 30 is rotated into a vertically long elliptical shape by the electric drill 34, and the magnet M is positioned at the center of the drilling blade 33 as shown in FIG. The perforation blade 33 is pressed against the wall material W2 so that the long side direction in H is along the long side direction in the concave portion 13 of the flat plate portion 12. Then, the perforation blade 33 penetrates the wall material W2, and the vertically long elliptical through hole Wa is formed in the wall material W2.

  At this time, since the concave portion 13 is formed in the front end surface 12a of the flat plate portion 12 at a portion corresponding to the trajectory H through which the drilling blade 33 passes, when the drilling blade 33 penetrates the wall material W2, the drilling blade 33 is Contact with the flat plate portion 12 is avoided. Here, “the part corresponding to the trajectory H” is slightly shifted inward and outward from the part that completely matches the trajectory H through which the drilling blade 33 passes and the part that completely matches the trajectory H of the drilling blade 33. The part that includes the position. Therefore, when the piercing blade 33 penetrates the wall material W2, the piercing blade 33 contacts the flat plate portion 12 even if the piercing blade 33 slightly deviates inward and outward from the portion that completely coincides with the locus H. Can be avoided.

  When the through hole Wa is drilled in the wall material W2, the through hole 14 is exposed to the surface of the wall W through the through hole Wa, and the opening 21a of the wiring box 21 is formed through the through hole 14 in the wall. W faced.

  Next, the mounting piece M1 was removed from the mounting portion 15, and as shown in FIG. 6, a cable (not shown) was connected to the outlet 35, and inserted into both the upper and lower portions of the mounting frame 36 holding the outlet 35. Screws 37 are screwed into the attachment portions 15 of the box cover 11 to attach the attachment frame 36 to the box cover 11. Then, the outlet 35 is installed on the wall W.

In the above embodiment, the following effects can be obtained.
(1) Around the through hole 14 in the box cover 11, a recess 13 that is recessed from the front end surface 12 a is formed at a site corresponding to the locus H of the drilling blade 33. Therefore, it is possible to avoid that the perforation blade 33 penetrating the wall material W2 comes into contact with the box cover 11 when the through hole Wa is formed in the wall material W2.

  (2) The rear end surface 12b of the flat plate portion 12 is formed with a protruding portion 18 that protrudes more than the rear end surface 12b, and the concave portion 13 is formed so as to overlap with the region where the protruding portion 18 is formed. Yes. Therefore, the depth of the concave portion 13 can be made the same depth as the thickness of the flat plate portion 12. For example, the protruding portion 18 is not formed and the concave portion 13 is formed deeper than when the concave portion is formed within the thickness of the flat plate portion 12. can do.

  (3) The recessed portion 13 is recessed on the front end surface 12 a of the flat plate portion 12 until it reaches the through hole 14 from a portion corresponding to the locus H of the drilling blade 33. Therefore, even when the size of the vertically long oval shape in the drilling blade 33 used when drilling the through hole Wa in the wall material W2 is smaller than the trajectory H, the drilling blade 33 penetrating the wall material W2 is provided. Contact with the box cover 11 can be avoided.

  (4) The recessed portion 13 is recessed on the front end surface 12 a of the flat plate portion 12 until it reaches the through hole 14 from a portion corresponding to the locus H of the drilling blade 33. Therefore, the magnet M can be disposed on the box cover 11 by attaching the mounting piece M1 to the mounting portion 15 using the recess of the concave portion 13. At this time, since the length in the depth direction of the concave portion 13 is formed to be the same as or slightly longer than the length in the thickness direction of the attachment piece M1, when the attachment piece M1 is attached to the attachment portion 15, The attachment piece M1 and the magnet M are prevented from protruding beyond the front end face 12a. Moreover, compared with the case where the magnet M is arrange | positioned in the wiring box 21, the magnet M can be brought close to the wall material W2, and the sensitivity to the magnet M by a magnet detector can be improved.

  (5) The recessed portion 13 is recessed in the front end surface 12 a of the flat plate portion 12 until it reaches the through hole 14 from a portion corresponding to the locus H of the drilling blade 33. Here, in order to form a recess for avoiding contact with the punching blade 33, the entire region outside the locus H is recessed from the portion corresponding to the locus H of the punching blade 33 on the front end surface 12 a of the flat plate portion 12. It is possible to form with. However, the flat plate portion 12 that is recessed from the region corresponding to the trajectory H of the drilling blade 33 in the entire region outside the trajectory H is recessed until the through hole 14 is reached from the portion corresponding to the trajectory H of the drilling blade 33. Compared to 12, the thickness portion is small, and the strength of the flat plate portion 12 is lowered, which is not preferable. Therefore, in the front end surface 12a of the flat plate portion 12, the thickness portion is kept to a minimum to suppress a decrease in strength of the flat plate portion 12 by being recessed from the portion corresponding to the locus H of the drilling blade 33 to the through hole 14. However, contact with the drilling blade 33 can be avoided.

  (6) The recessed portion 13 is recessed in the front end surface 12 a of the flat plate portion 12 until it reaches the through hole 14 from a portion corresponding to the locus H of the drilling blade 33. Here, in order to avoid contact with the perforating blade 33, for example, it is conceivable that the through hole 14 is enlarged to the outer peripheral side of the trajectory H of the perforating blade 33 without forming the concave portion 13. However, increasing the size of the through hole 14 is not preferable because the strength of the flat plate portion 12 decreases. Therefore, by forming the protruding portion 18 on the flat plate portion 12 and forming the concave portion 13 by using the protruding portion 18, the portion corresponding to the locus H of the drilling blade 33 has a thickness (the protruding portion 18). Further, it is possible to avoid contact with the perforating blade 33 while suppressing the strength reduction of the flat plate portion 12.

  (7) The width from the outer peripheral edge to the inner peripheral edge of the recess 13 along the vertical direction in both the upper and lower parts of the protrusion 18 is the same as the width of the recess 13 along the left and right direction of the recess 13 in It is longer than the width from the outer periphery to the inner periphery. Since the through-hole 14 has a vertically long rectangular shape extending in the vertical direction of the flat plate portion 12, the flat plate portion 12 tends to have low strength in the direction along the vertical direction. Therefore, the protrusion 18 is formed such that the width from the outer periphery to the inner periphery of the recess 13 along the vertical direction is longer than the width from the outer periphery to the inner periphery of the recess 13 along the left-right direction. Thus, it is possible to have as much meat as possible in the direction along the vertical direction of the flat plate portion 12. As a result, strength reduction in the direction along the vertical direction in the flat plate portion 12 can be suppressed.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the redundant description thereof is omitted or simplified.

  As shown in FIGS. 7A and 7B, the box cover 41 includes a flat plate portion 42 in which the concave portion 13 is not formed, and more than a portion corresponding to the locus H on the front end surface 42 a of the flat plate portion 42. A plurality of protrusions 61 (six in this embodiment) are provided on the outside so as to surround the locus H and to follow the peripheral edge of the locus H. The protrusion 61 has a cylindrical shape, and when viewed from the front, the tip surface 61a of the protrusion 61 has a circular shape. The front end surface 61a of each protrusion 61 constitutes a contact portion that comes into surface contact with the back surface of the wall material W2, and an area inside the position where each protrusion 61 is provided A space recessed from the front end surface 61a is formed, and this space functions as an escape portion.

  The protrusion 61 is formed such that the length in the height direction of the protrusion 61 is the same as or slightly longer than the length in the thickness direction of the attachment piece M1. Therefore, when the attachment piece M1 is attached to the attachment portion 15, the attachment piece M1 and the magnet M are prevented from protruding beyond the front end surface 61a of the protrusion 61. Further, the protrusion 61 is arranged as close to the attachment portion 15 as possible. Further, the protrusion 61 is formed so that it can be bent from the base end of the protrusion 61 to remove the protrusion 61 itself.

  In the state where the box cover 41 having the above-described configuration is installed on the back of the wall W and the front end surface 61a of the protruding portion 61 is in contact with the back surface of the wall material W2, the wall material W2 is formed by the electric punching tool 30 as in the first embodiment. A through hole Wa is drilled in the hole. At this time, since a space recessed from the front end surface 61a is formed in a region inside the position where each projection 61 is provided, when the piercing blade 33 penetrates the wall material W2, the piercing blade 33 is flat. Contact with 42 is avoided.

Therefore, according to the second embodiment, the following effects can be obtained.
(8) A space recessed from the front end surface 61a is formed in a region inside the position where each protrusion 61 is provided, and this space functions as a relief portion. Therefore, it is possible to avoid that the perforation blade 33 penetrating the wall material W2 comes into contact with the box cover 41 when the through hole Wa is formed in the wall material W2.

  (9) Since the protrusion 61 is provided outside the position corresponding to the locus H so as to surround the locus H, when the through hole Wa is drilled in the wall member W2, the wall member W2 is penetrated. The perforating blade 33 does not come into contact with the protrusion 61.

  (10) The protrusion 61 is disposed as close to the attachment portion 15 as possible. When the screws 37 inserted through the upper and lower portions of the mounting frame 36 holding the outlet 35 are screwed into the mounting portion 15 of the box cover 41, a tensile force that pulls the box cover 41 toward the back side of the wall material W2 acts. This tensile force tends to concentrate on the mounting portion 15. Therefore, it is possible to suppress the box cover 41 from being drawn toward the back surface side of the wall material W2 by arranging the protrusions 61 that are in contact with the back surface of the wall material W2 as close as possible to the attachment portion 15. As a result, the box cover 41 is not easily deformed by the tensile force, and the screws 37 inserted through the upper and lower portions of the mounting frame 36 can be easily screwed into the mounting portion 15 of the box cover 41.

  (11) The protrusion 61 is formed so that the protrusion 61 itself can be removed by being bent from the base end of the protrusion 61. For example, when the through hole Wa smaller than the through hole 14 is drilled in the wall material W2, the perforation blade 33 penetrating the wall material W2 passes through the through hole 14, and therefore it is necessary to form a space that functions as a relief portion. Disappears. Therefore, since it is not necessary to provide the protrusion 61 on the box cover 41, the protrusion 61 is bent and removed from its base end. According to the box cover 41 from which the protruding portion 61 is removed, the entire front end surface 42a of the flat plate portion 42 can be brought into contact with the back surface of the wall material W2.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 8A, the box cover 51 includes a flat plate portion 52 in which the concave portion 13 is not formed. Further, in the wiring box 21, the front end surface 25 b of the boss portion 25 in which the boss hole 25 a is formed is provided at a position that is recessed toward the bottom wall 22 side from the opening end surface 21 b of the wiring box 21.

  As shown in FIG. 8B, the box cover 51 is disposed so as to enter the wiring box 21, and the screw 29 is fastened to the boss hole 25 a of the boss portion 25 through the attachment hole 16. Thus, the box cover 51 is attached to the wiring box 21. Then, a wiring box device 50 including the box cover 51 and the wiring box 21 is configured.

  Here, since the front end face 25 b of the boss part 25 is provided at a position that is recessed toward the bottom wall 22 side than the opening end face 21 b of the wiring box 21, the front end face 52 a of the flat plate part 52 is the opening end face of the wiring box 21. Retreats to the bottom wall 22 side than 21b. That is, the wiring box device 50 is formed with a relief portion recessed toward the bottom wall 22 from the position of the opening end surface 21b of the wiring box 21, and penetrates the wall material W2 when the through hole Wa is drilled in the wall material W2. It is possible to avoid the perforated blade 33 coming into contact with the flat plate portion 52. In this case, the opening end surface 21b of the wiring box 21 constitutes a contact portion that contacts the back surface of the wall material W2.

Therefore, according to the third embodiment, the following effects can be obtained.
(12) Since the front end face 25b of the boss portion 25 is provided at a position where the front end face 25b of the boss portion 25 is recessed toward the bottom wall 22 side than the opening end face 21b of the wiring box 21, the front end face 52a of the flat plate portion 52 is provided. Is recessed toward the bottom wall 22 side from the opening end face 21b of the wiring box 21. Therefore, in the wiring box device 50, a relief portion is formed which is recessed toward the bottom wall 22 with respect to the position of the opening end surface 21b of the wiring box 21, and when the through hole Wa is drilled in the wall material W2 by this relief portion. Further, it is possible to avoid that the perforating blade 33 penetrating the wall material W2 comes into contact with the flat plate portion 52.

  (13) The wiring box device 50 is attached to the wiring box 21 so that the box cover 51 enters the wiring box 21. Therefore, compared with the case where the box cover 51 is attached on the opening end surface 21b of the wiring box 21, the thickness of the wiring box device 50 itself can be reduced.

In addition, you may change the said embodiment as follows.
In 1st Embodiment, as shown to Fig.9 (a) and (b), the coating allowance part 17 surrounding the through-hole 14 has fixed thickness on the front-end surface 12a (one end surface) of the flat plate part 12. FIG. In addition, the recessed portion 13 may be formed so as to be recessed from the portion corresponding to the locus H of the drilling blade 33 until reaching the through hole 14 on the distal end surface 17a of the coating portion 17. In this case, the entire circumference of the recess 13 is covered with the tip surface 17a without opening outward of the coating portion 17, and the entire tip surface 17a of the coating portion 17 is in contact with the back surface of the wall material W2. The contact part to obtain is comprised. Note that the box cover 11 may be used as a type embedded in a concrete wall.

  In 1st Embodiment, although the flat part 12 of the box cover 11 was dented and the recessed part 13 was formed, this recessed part 13 was functioned as an escape part, but it is not restricted to this. For example, as shown in FIG. 10A, the box cover 41 includes a flat plate portion 42 in which the recess 13 is not formed, and has a certain thickness on the entire periphery of the edge portion of the front end surface 42 a in the flat plate portion 42. Ribs 43 having a quadrangular annular shape are erected. The rib 43 is integrally formed with the flat plate portion 42. Attachment holes 44 a are formed at the corners of the flat plate portion 42.

  In the wiring box 21, a boss portion 25 is provided at a position corresponding to the corner portion of the flat plate portion 42. As shown in FIG. 10B, the box cover 41 is fastened to the boss hole 25a of the boss portion 25 via the mounting hole 44a so that the box cover 41 is placed on the opening end surface 21b of the wiring box 21. Attached to. According to the box cover 41 configured as described above, the front end surface 42a of the flat plate portion 42 is positioned away from the front end surface of the rib 43, and the wall material is formed when the through hole Wa is formed in the wall material W2. It is possible to avoid the drilling blade 33 penetrating W2 from coming into contact with the flat plate portion 42. In this case, the rib 43 constitutes a contact portion that contacts the back surface of the wall material W2.

  ○ Although the box covers 11, 41, 51 of each of the above embodiments are applied to the one in which only one mounting frame 36 holding the outlet 35 installed on the building wall is fixed, it is not limited to this. For example, the present invention may be applied to a structure in which two attachment frames 36 are fixed. For example, as shown in FIGS. 11A and 11B, a through hole 74 is formed in the central portion of the flat plate portion 72 in the box cover 71. The through hole 74 has a substantially square shape when viewed from the front. In the flat plate portion 72, a recess 73 is provided around the through hole 74. When viewed from the front, the concave portion 73 is formed in the flat plate portion 72 so that two vertically elongated elliptical first and second concave portions 73 a and 73 b extending in the vertical direction of the box cover 71 are arranged in the horizontal direction of the box cover 71. In the first and second recesses 73a and 73b, a mounting portion 75 having a substantially cylindrical shape that bulges into the through hole 74 is provided at the center of both the upper and lower inner edge portions.

  In the first embodiment, the escape portion is formed by denting the front end surface 12a of the flat plate portion 12 from the outer peripheral side of the portion corresponding to the locus H of the drilling blade 33 and from the locus H until reaching the through hole 14. However, the present invention is not limited to this, and a groove in which only a portion corresponding to the locus H of the drilling blade 33 is recessed in the front end surface 12a of the flat plate portion 12 may be used as the escape portion.

  In 1st Embodiment, while forming a protrusion only in the site | part corresponding to the locus | trajectory H of the piercing blade 33 in the rear-end surface 12b of the flat plate part 12, the locus | trajectory H of the piercing blade 33 is overlapped with this protrusion. You may form the groove | channel where only the corresponding site | part was dented.

  In 1st Embodiment, although the recessed part 13 was formed by denting until it reaches the through-hole 14 from the site | part corresponding to the locus | trajectory H of the drilling blade 33 in the front end surface 12a of the flat plate part 12, it is not restricted to this. Instead, the front end surface 12a of the flat plate portion 12 may be formed by denting the entire outside region from the portion corresponding to the locus H of the drilling blade 33.

  In the first embodiment, the depth of the concave portion 13 is the same as the thickness of the flat plate portion 12, but not limited to this, even if the depth of the concave portion 13 is deeper than the thickness of the flat plate portion 12. In addition, the depth of the recess 13 may be shallower than the thickness of the flat plate portion 12.

  In 1st Embodiment, while the protrusion part 18 which protrudes rather than the rear-end surface 12b is formed in the rear-end surface 12b of the flat plate part 12, the recessed part 13 overlaps with the inside of the area | region in which the protrusion-part 18 was formed. However, the present invention is not limited to this, and for example, a concave portion may be formed within the thickness of the flat plate portion 12 where the protruding portion 18 is not formed.

  ○ In the second embodiment, the protrusion 61 is outside the portion corresponding to the locus H on the front end surface 42a of the flat plate portion 42, and surrounds the locus H and follows the peripheral edge of the locus H. Although arranged, it is not limited to this. For example, as long as the front end surface 42a of the flat plate portion 42 is outside the portion corresponding to the locus H, the arrangement position of the protruding portion 61 may not be particularly limited.

  In the second embodiment, the protrusion 61 has a cylindrical shape, and the front end surface 61a of the protrusion 61 has a circular shape when viewed from the front and is in surface contact with the back surface of the wall material W2. Although the contact part which contact | connects was comprised, it is not restricted to this. For example, the protrusion 61 has a conical shape with the tip sharpened toward the tip surface 61a, and a contact portion that contacts the tip surface 61a of the protrusion 61 so as to make point contact with the back surface of the wall material W2 is configured. You may do it. Further, when the projection 61 is viewed from the front, the projection 61 may have a rectangular shape or a curved shape, and the shape of the projection 61 is not particularly limited.

  In the second embodiment, six protrusions 61 are provided on the front end surface 42a of the flat plate part 42. However, the present invention is not limited thereto, and two to five protrusions 61 are provided on the front end surface 42a of the flat plate part 42. Or seven or more may be provided.

  In each of the above embodiments, when the through hole Wa is drilled in the wall material W2, the electric drilling tool 30 provided with the cup-shaped casing 31 whose opening shape at one end forms a vertically long elliptical shape is used. Not limited to this, when the through hole Wa is drilled in the wall material W2, an electric drilling tool including a casing whose opening shape at one end is circular may be used. In this case, when the through hole Wa is formed in the wall material W2, two through holes Wa are formed in the wall material W2 so as to partially overlap in the direction along the vertical direction, and as a result, along the vertical direction. A through hole Wa having a substantially bowl shape is formed in the wall material W2. Accordingly, the shape of the concave portion 13 formed in the flat plate portion 12 may be substantially bowl-shaped along the vertical direction of the box cover 11 when viewed from the front.

  In the first embodiment, when the wiring box 21, the box cover 11, and the outlet 35 are installed on the wall W, the front end surface 12a of the flat plate portion 12 is in contact with the back surface of the front wall member W2. However, the present invention is not limited thereto, and the front end surface 12a of the flat plate portion 12 may be slightly separated from the back surface of the front wall member W2.

  In each of the above embodiments, the electric drilling tool 30 to which the electric drill 34 as a driving source is attached is used as the drilling tool. However, the present invention is not limited thereto, and a cutting tool such as a saw may be used as the drilling tool. .

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The box cover according to claim 1, wherein a square annular rib having a certain thickness is provided upright as the abutting portion on the entire periphery of the edge portion of the flat plate portion.

(B) The box cover according to claim 2, wherein the protrusion is formed so that the protrusion can be removed by being bent from a base end thereof.
(C) A detected member for detecting a reference of a drilling position from the wall surface is attached to a region inside the position where the projection is provided, and the length in the height direction of the projection is 3. The box cover according to claim 2, wherein the box cover is equal to or slightly longer than a length in a thickness direction of the member to be detected.

  H ... locus, M ... magnet as a member to be detected, W ... wall, W2 ... wall material, Wa ... through hole, 11, 41, 51, 71 ... box cover, 12, 42, 52, 72 ... flat plate portion, 12a , 42a, 52a ... front end surface as a contact portion, 12b ... rear end surface as the other end surface, 13, 73 ... recess as escape portion, 14, 74 ... through hole, 16, 44a ... mounting hole, 17 ... coating allowance 17a: a tip surface as an abutting portion, 18 ... a projecting portion, 21 ... a wiring box, 21a ... an opening, 21b ... an opening end surface, 25 ... a boss portion, 25a ... a boss hole, 25b ... as one end surface of the boss portion Front end surface of 29, ... Screws as fastening members, 30 ... Electric punching tool as punching tool, 33 ... Drilling blade, 50 ... Wiring box device, 61 ... Projection part, 61a ... End face as contact part.

Claims (10)

Installed on the wall of the building wall and attached to a bottomed box-like wiring box with an opening on one side, fixing the flat part that closes part of the opening and the mounting frame that holds the wiring device And a through-hole that is formed so that the abutting portion can abut against the back surface of the wall material and is perforated in the wall material by a punching tool. In the box cover in which the through hole and the mounting portion face the wall surface,
Around the through hole, a relief portion for avoiding contact with the drilling blade is recessed from the contact portion at a portion corresponding to the trajectory of the drilling blade in the drilling tool larger than the through hole. A box cover characterized by being provided.   On one end surface of the flat plate portion, a plurality of protrusions are provided outside a portion corresponding to the trajectory, the contact portion is formed by a tip surface of the protrusion, and the escape portion The box cover according to claim 1, wherein the box cover is an area inside the provided position.   The box cover according to claim 2, wherein the protrusion is provided so as to surround the locus.   The box cover according to claim 2, wherein the protrusion is provided along a peripheral edge of the locus.   2. The box cover according to claim 1, wherein the abutting portion is formed by one end surface of the flat plate portion, and the escape portion is formed by a concave portion recessed from one end surface of the flat plate portion.   The other end surface of the flat plate portion is formed with a protruding portion that protrudes from the other end surface, and the concave portion is formed so as to overlap with the region where the protruding portion is formed. The box cover according to claim 5.   The contact portion is formed of a tip end surface of a coating portion that is erected from one end surface of the flat plate portion and surrounds the through hole, and the escape portion is formed of a concave portion that is recessed from the tip surface of the coating portion. The box cover according to claim 1.   The box cover according to any one of claims 5 to 7, wherein the concave portion is recessed from a portion corresponding to a trajectory of the drilling blade until reaching the through hole.   A detected member for detecting the reference of the drilling position from the wall surface is attached in the concave portion, and the length in the depth direction of the concave portion is the same as or slightly the length in the thickness direction of the detected member. The box cover according to claim 8, wherein the box cover is long. A wiring box that is installed on the back of the building wall and has a bottomed box shape with an opening on one side;
A box cover provided with a flat plate portion that has a through-hole that faces the surface of the opening and is attached to the wiring box and closes a part of the opening;
A mounting hole is formed in the box cover, and a boss portion having a boss hole formed in one end surface is provided in the wiring box, and a fastening member is fastened to the boss hole through the mounting hole. Thus, a wiring box device in which the box cover and the wiring box are assembled together,
One end surface of the boss portion is provided at a position that is recessed to the bottom side from the opening end surface of the wiring box, the box cover is disposed so as to enter the wiring box, and one end surface of the flat plate portion is A wiring box device, wherein the wiring box device is retracted to the bottom side from the opening end face.

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