JP5058945B2 - Wiring box and box cover - Google Patents

Description

  The present invention relates to a wiring box having a mounting portion to which a screw for mounting a wiring device or a box cover is screwed, and a box cover having a mounting portion to which a screw for mounting the wiring device is screwed. .

  Conventionally, a wiring box has a mounting portion in which a mounting screw is screwed to mount a wiring cover such as a switch or an outlet or a box cover that covers a part or all of the front surface of the wiring box. Yes. The mounting portion is provided with a hollow cylindrical mounting portion having an insertion port on the back surface of the wiring box erected from the bottom wall in the wiring box, and a nut is press-fitted from the insertion port into the nut accommodating space in the mounting portion. It was equipped with a nut. Since this mounting portion is directly subjected to a load for inserting / removing the outlet plug into / from the attached outlet, the mounting portion has sufficient strength by being cylindrical. However, since the insertion direction of the nut is in line with the insertion direction of the mounting screw, when the mounting screw is screwed in, it is pushed by the tip of the screw and the nut moves in the counter-pressing direction side, and the insertion port on the back of the box I sometimes dropped out of it.

Therefore, in order to solve the above problem, as disclosed in Patent Document 1, it is formed so as to extend from the outer surface of the peripheral wall of the wiring box in a direction perpendicular to the screwing direction of the screw into the nut. It is known to provide an insertion port that leads to the nut housing space and to install the nut from the outside of the wiring box into the mounting portion. According to such a configuration, the insertion port is provided in a direction perpendicular to the screwing direction of the screw, so that the nut is not pushed from the mounting portion by the screw.
JP-A-9-28017

However, the insertion port of the mounting part is exposed on the outer surface of the peripheral wall, and the nut housing space and the outside of the box communicate with each other, so rainwater and dust will enter if the box is exposed on the wall surface of the building.・ It accumulates and enters into the box through the gap between the mounting screw and the box and the gap between the nut and the box, etc., or rust is generated and the mounting screw cannot be removed when replacing or inspecting the wiring equipment. It was not practical. Further, when embedding in concrete, there is a possibility that the concrete may invade the screwed portion of the nut through the insertion port. Therefore, it is necessary to close the insertion port with a curing tape, which is troublesome.
Furthermore, the base end of the mounting portion is formed in a hollow shape, and the base end of the mounting portion of the wiring box that has been installed for many years is subject to a considerable load on the outlet plug, which may be deformed or broken. there were.

  In addition, it is conceivable to mold by the insert molding method in which a nut is placed in the mold in advance when the wiring box is molded, and the insert molding method is to place the nut in the released mold. Compared with the molding method in which the molding of the wiring box body and the process of housing the nut in the nut housing space are separately performed, the molding speed is slow, and the mold is complicated and expensive. Furthermore, since the nut can be molded even if it is not properly disposed in the mold, the mounting screw may be inserted in a direction that cannot be screwed in, and the inspection is very laborious.

  It is an object of the present invention to provide a wiring box and a box cover that have good appearance even when installed on a wall surface of a building, and that do not allow concrete to enter the mounting portion even when buried in concrete.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a box-like shape comprising a bottom wall and a peripheral wall erected from the bottom wall, and having an opening on one side. A box body having a nut housing space in which a nut into which a mounting screw for mounting the cover is screwed is provided and having a mounting portion protruding inwardly from the peripheral wall, and a nut mounted in the mounting portion A wiring box comprising: a nut insertion port capable of installing a nut in the nut housing space in the mounting portion in a direction perpendicular to a screwing direction of the mounting screw; The gist is that the nut housing space is provided so as to open toward the inside of the main body, and the nut housing space is blocked from the outside of the box main body through a peripheral wall.

  According to a second aspect of the present invention, in the first aspect of the present invention, the attachment portion is formed in a pair with opposing peripheral walls, and the nut insertion port faces each other between the pair of attachment portions. The gist is that it is formed.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the bottom wall is fixed toward the wall side of the building so as to be installed in a state where the whole is exposed on the wall surface of the building. The gist is that a through-hole for guiding a cable into the box body is formed in the peripheral wall, and only the through-hole penetrates the peripheral wall to communicate the inside and outside of the box main body. .

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the bottom wall is fixed toward the wall side of the building so as to be installed in a state where the whole is exposed on the wall surface of the building. The peripheral wall is provided with one or a plurality of through-hole formation scheduled portions for forming a through-hole for guiding a cable into the box body, and the through-hole formation planned portion is a removable blocking portion The above-mentioned through hole can be formed by removing the blocking portion, and the gist of the present invention is that the inside of the box main body and the outside are not communicated over the entire peripheral wall.

  Invention of Claim 5 is the wiring box installed in the state exposed to the wall surface of a building in the invention of Claim 1 or Claim 2, and the said surrounding wall and bottom wall are the whole. The gist is that the inside of the box body does not communicate with the outside.

  The invention described in claim 6 is the wiring box embedded in the concrete wall in the invention described in claim 1 or 2, wherein a cable is provided in the box body on the peripheral wall and / or the bottom wall. One or a plurality of through-hole formation scheduled portions for forming a through-hole for guiding are formed, the through-hole formation planned portion includes a removable blocking portion, and the through-hole can be formed by removing the blocking portion. There is a summary.

  According to a seventh aspect of the present invention, in the first to sixth aspects of the invention, the nut insertion opening that opens toward the inside of the box body and the nut housing space are provided with the mounting portion. The gist is that it forms at least a part of the inner surface of the peripheral wall in the vicinity of the mounting portion of the peripheral wall and is formed together with the inner surface of the peripheral wall at the time of injection molding by a slide piece of a mold that slides inwardly of the box body.

  The invention according to claim 8 is provided with a mounting portion internally provided with a nut into which a mounting screw for mounting a wiring device is screwed, and is fixed to the opening side of a wiring box having an opening on one side. A box cover that closes and leaves a part of the opening of the wiring box, the box cover having a fixing part fixed to the box, and a closing part closing the opening of the box, A through opening is formed in a part of the closed portion so that a part of the opening of the box faces outward, and a mounting portion having a nut receiving space in which the nut is housed is formed in the through opening. In the mounting portion, a nut insertion port in which a nut can be housed in the nut receiving space is a direction orthogonal to the screwing direction of the mounting screw and opens toward the inside of the through opening. As provided It is summarized as Rukoto.

  ADVANTAGE OF THE INVENTION According to this invention, the wiring box and box cover which a nut insertion port is not exposed outside can be provided.

  A wiring box according to a first embodiment of the present invention will be described below with reference to FIGS. 1 is a perspective view of the wiring box 10 in which the nut 21 is housed in the mounting portion 18 of the box body 11, and FIG. 2 (a) is a cross-sectional view of the box body 11 before the nut 21 is housed. (B) And (c) is a principal part expansion perspective view which interiorizes the nut 21 in the attaching part 18 of the box main body 11, FIG.3 (a) and (b) are sectional drawings of the state which comprised the nut 21 internally. It is.

  As shown in FIGS. 1 to 3, the wiring box 10 has a box body 11 made of a synthetic resin having a bottomed square box shape opened to the front surface (one surface). The box body 11 is composed of a bottom wall 12 and a peripheral wall 13 erected from the bottom wall 12. A through hole 14 for guiding a cable into the box main body is provided on one side of the peripheral wall 13 that is opposed to the inside of the box main body and the outside. On the other side, there is provided a through-hole formation scheduled portion 15 that is closed by a closing plate as a closing portion 15a that can be removed by a tool or the like. The closing plate is connected to the outer periphery of the box by a connecting thin portion 15b that forms the same plane as the peripheral wall 13, so that it is not easily visible from the outside of the box body. Further, an attachment portion 18 for attaching a pair of wiring devices facing each other on the front surface side (opening side) of the peripheral wall 13 and facing each other on the peripheral wall faces from the peripheral wall 13 toward the inside of the box body. A space 17 is formed between the mounting portion 18 and the bottom wall 13.

  The mounting portion 18 is formed with an insertion hole 18a into which a mounting screw used for mounting a wiring device to the box body 11 can be inserted, and further includes a nut housing space 18b for internally housing a nut into which the mounting screw is screwed. It is formed inside. The nut housing space 18b communicates with a nut insertion port 18c that opens toward the inside of the box body provided in the mounting portion. As shown in FIG. 2B, the nut insertion port 18c It is formed in a size that can be inserted by being pushed into the nut housing space from the inside of the box body, and the communication direction is a direction orthogonal to the screwing direction of the mounting screw. And, in the nut housing space, a portion narrower than the thickness of the nut is formed, and by forcibly inserting the nut, the frictional force between the nut housing space inner surface and the nut outer surface is increased, While preventing dropout from the storage space, nuts are prevented from rattling inside the storage space.

  Further, the nut insertion openings 18c of the set of attachment portions 18 are in a direction orthogonal to the peripheral wall 13 on which the attachment portions 18 are formed, and the nut insertion openings 18c of both attachment portions are formed to face each other. Yes. Further, by inserting the nut 21 until it comes into contact with the back of the nut housing space 18b, the nut 21 is arranged in a state where the axial center of the insertion hole 18a through which the mounting screw is inserted coincides, as shown in FIG. Is done. Further, the nut housing space 18c is shut off by the peripheral wall 13 with the mounting portion protruding so that the inside of the housing space does not communicate with the outside of the box body. Etc. will not invade. And since the said nut insertion port 18c is opening toward the box main body inner side enclosed by the surrounding wall 13, the nut insertion port 18c is not exposed to the outer surface of a surrounding wall, but box main bodies, such as a wall surface of a building, are exposed. Even if it is an exposed installation location, it can be installed with good aesthetics. As shown in FIG. 2C, a U-shaped notch 18d that is screwed into the nut and into which the tip of the mounting screw that passes through the nut enters is provided on the bottom wall side of the mounting portion.

  Next, a method for manufacturing the wiring box 11 will be described with reference to FIG. FIG. 4 is a schematic view of a mold when the box body is injection-molded. As shown in FIG. 4A, an outer mold 31 for molding the outer surface side of the box body and an inner mold 32 for molding the inner surface side of the box body, the outer mold 31 and the inner mold 32 are formed. The resin is injected and filled into the gap 36 formed between the molds in close contact. Thereafter, the molds are separated from each other, and the molded box body 11 is taken out. The inner mold 32 is provided with a pair of slide pieces 33 that form a space 17 between the mounting portion 18 of the box body and the bottom wall 12, and the pair of slide pieces 33 is formed of the outer mold 31. When the inner mold 32 is separated from each other, as shown in FIG. 4B, both the slide pieces 33 move in a direction close to each other and are detached from the molded box body 11.

  The slide piece 33 includes a projecting portion 33a for forming the nut housing space 18b and the nut insertion port 18c of the box body, a through hole forming portion 33b for forming the through hole 14 of the peripheral wall 13 of the box body, A closed through-hole forming portion 33c for forming the through-hole forming scheduled portion 15 closed by the closed portion and a peripheral wall inner surface forming portion 33d for forming the inner surface of the peripheral wall on which the mounting portion 18 is formed are provided. Yes. Then, as the slide piece 33 moves in the direction indicated by the arrow, the protruding portion 33a is pulled out from the formed nut housing space. The nut housing space is opened by a nut insertion opening in a direction orthogonal to the peripheral wall on which the mounting portion is formed and in the same direction as the movement direction of the slide piece 33, so that the inner surface of the peripheral wall on which the mounting portion is formed (specifically Specifically, the nut housing space and the nut insertion port are formed by using the slide pieces 33 that form the inner peripheral wall of the space formed between the mounting portion and the bottom wall and the inner peripheral wall surfaces on both sides of the mounting portion. And a simple mold structure is sufficient.

  Next, the box body 11 taken out of the mold is housed by pushing the nut 21 into the nut housing space 18b from the nut insertion opening 18c opened in the box body, thereby accommodating the nut. 10 can be obtained.

  Next, a method for using the wiring box of the first embodiment will be described with reference to FIG. As shown in the figure, the bottom wall of the wiring box 10 is fixed to the wall 41 of the building using the fixing screw 23, and the wiring device frame 43 with the outlet 42 attached is attached to the mounting portion 18 with the mounting screw 22. The decorative plate 44 is fixed to the wiring device frame 43, and the entire front opening of the wiring box is closed so that only the front surface of the outlet faces. The through hole 14 provided in the peripheral wall 13 of the wiring box 10 is attached with a connector 45 for connecting a protective tube of a cable wired in the box body, and the protective tube 46 is bonded to the connector 45. A cable 47 connected to the wiring box and wired in the protective tube is wired in the wiring box body and connected to the outlet 42.

  The pitch of the pair of mounting portions 18 facing each other in the wiring box is formed to be the same as the pitch of the mounting holes through which the mounting screws 22 provided in the wiring device frame pass. The overall shape of the wiring box formed by the peripheral wall 13 is substantially the same as the size of the decorative plate 44, and the decorative plate 44 and the wiring box 10 are integrally formed by fixing the decorative plate 44. It looks good and the beauty is good In the figure, since the cable is wired from only one through hole 14 into the wiring box, the through hole formation scheduled portion 15 is not used, but another connector can be obtained by removing the blocking portion 15a. In addition, the protective tube can be connected to the wiring box. However, when not in use, it is closed without being removed as shown in the figure.

  The wiring box thus installed is installed so that the entire wiring box 10 is exposed on the wall surface of the building, and the through-hole formed in the peripheral wall 13 is substantially blocked by the connector and the protective tube. Thus, there is no place on the peripheral wall that connects the inside and outside of the wiring box. In addition, the conventional nut insertion port cannot be seen from the outside of the wiring box body. Therefore, even if it is installed on the front side of the building and is easily visible, the nut insertion port is not formed over the entire peripheral wall, it can be installed aesthetically, and dust accumulates on the nut insertion port. There is no. Furthermore, since it is possible to prevent rainwater from entering the inside of the wiring box, it is particularly suitable for installation in places where it is exposed to rain outdoors.

  Next, a wiring box according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6A is a perspective view of the wiring box of the second embodiment, and FIG. 6B is a cross-sectional view thereof. This second embodiment is a wiring box that is concealed in the wall of a building, and particularly suitable for embedding concrete in a concrete wall. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, a synthetic resin is formed of a bottom wall 12 and a peripheral wall 13 erected from the bottom wall 12 and has a bottomed square box shape that opens to the front surface (one surface) facing the bottom wall 12. It has a box body 11 made of metal. The peripheral wall 13 is formed with a plurality of through-hole forming scheduled portions 15 that are closed by a closing plate as a closing portion 15a, and a pair of box cover mounting portions 18 project at substantially diagonal positions inside the peripheral wall. Is formed. Similar to the first embodiment, the mounting portion 18 has a nut housing space therein, and the nut 21 is press-fitted from a nut insertion port 18c formed inside the box of the mounting portion 18 so that the nut is inserted. It is housed in a containment space. A recessed portion 67 is formed on the bottom wall side of the mounting portion 18 so as to be recessed from the outside to the inside of the box body 11, and the threaded mounting is provided between the recessed portion 67 and the mounting portion 18. An entry space 68 into which the tip of the screw enters is provided. In addition, you may comprise the surrounding wall outer surface of the part flatly, without forming the recessed part 67. FIG.

  The through-hole formation scheduled portion 15 prevents the intrusion of concrete by connecting the entire circumference of the closing plate without any gap between the peripheral wall and the thin-walled connecting portion 15b. Moreover, the thin connection part 15b is provided in the inner surface side of the surrounding wall 13, and can be removed by striking a closing board using a tool etc. from the outside of a wiring box. The through-hole formation scheduled portion 15 may be provided not only on the peripheral wall 13 but also on the bottom wall 12. Also, through holes will be formed with all through holes closed with a blocking plate so that the through holes to be used can be specified flexibly corresponding to the piping path of the protective pipe to be connected (the wiring path of the cable leading into the wiring box) Although it is desirable to set it as the part 15, you may form a through-hole beforehand for the number of the through-holes to be used.

  FIG. 7 shows a state where the wiring box of the second embodiment is embedded in the concrete wall 51. A connector 45 for connecting a cable protection tube is attached to a through hole formed by removing the blocking plate of the through hole formation scheduled portion provided on the peripheral wall of the wiring box 10, and the cable protection tube 46 is connected to the connector. Has been. The wiring box is fixed in the mold 52 by a box support (not shown), and the opening on the front surface is brought into close contact with the mold 52 to prevent the intrusion of concrete from the opening. Then, after placing the concrete, the formwork 52 is removed, a box cover is applied to the opening facing the wall surface, and a mounting screw is screwed into the mounting portion 18 to fix the box cover to the wiring box.

  As described above, in the wiring box of the second embodiment, the opening is closed by the mold 52 in a state of being fixed in the mold, and there is substantially no portion that allows the inside of the box body to communicate with the outside. Therefore, the concrete does not enter the wiring box 10, and the concrete does not enter the nut housing space through the nut insertion port, and the mounting screw cannot be screwed. Since the entire wiring box is embedded in the concrete wall, the entire wiring box is not exposed as in the first embodiment, and the nut insertion opening opens to the outside of the box body, and the adhesive tape Even if it prevents the intrusion of concrete from the nut insertion opening into the nut housing space by closing it with etc., the appearance does not deteriorate. However, it is necessary to cure all of the plurality of nut insertion ports, and there is a risk of forgetting the curing. In that respect, the wiring box of this embodiment does not need to cure the nut insertion opening. In addition, as shown in FIG. 8, you may embed the box cover 61 in the state previously fixed to the wiring box with the attachment screw 22. As shown in FIG.

  Next, a box cover according to a third embodiment of the present invention will be described with reference to FIGS. While each of the above embodiments is a box-like wiring box, this embodiment is a box cover that is attached to the wiring box by closing a part of the opening of the wiring box. The box cover includes a mounting portion having the same configuration as that of each of the above embodiments. About the common structure, the same code | symbol is provided and description is abbreviate | omitted.

  The box cover 61 includes a closing plate portion 62 that closes the entirety of the wiring box while leaving a part of the opening, and a through opening 65 surrounded by a standing wall 64 that faces the part outward. The opening 65 is provided with a mounting portion 18 for attaching a wiring device having a pair of opposed ones. The closing plate 62 is provided with a fixing hole 66 for fixing the box cover to the wiring box. A nut insertion port 18 c facing the through opening is formed in the mounting portion 18, and a nut is inserted from the nut insertion port into a nut receiving space formed inside so that the nut 21 is inserted into the mounting portion 18. A box cover 61 is formed inside. Further, the mounting portion 18 is formed with an insertion hole 18a into which a mounting screw that is screwed into a nut 21 housed in the nut housing space 18b is screwed. Further, a standing wall 64 is continuously formed on the side opposite to the through-opening side of the nut housing space, and the outside of the standing wall 64 and the nut housing space 18b are blocked without communicating.

  As shown in FIG. 10, the box cover according to the present embodiment is formed so that the tip 64 a of the standing wall 64 is in close contact with the mold 52 in a state where the box cover 61 according to the present embodiment is fixed to the opening side of the wiring box 10. The wiring box is supported inside by a box support (not shown) and embedded in the concrete wall 51. Then, after removing the formwork, a wiring device is attached to the attachment portion 18. Since the intrusion of concrete from the through opening into the inside of the wiring box is prevented by the mold 52, the nut insertion port 18c faces the through opening 65 side and is blocked from the outside by the standing wall 64. The concrete does not enter the nut receiving space 18b. Although the box cover 61 of this embodiment is fixed to the wiring box and embedded together with the wiring box, only the wiring box may be embedded in the concrete wall and attached to the wiring box after removing the formwork. The wiring box to which the box cover of the present embodiment is fixed is preferably the wiring box of the second embodiment, but is not particularly limited.

According to the above embodiment, the following effects can be obtained.
(1) Since the nut insertion port 18c is not exposed to the outer surface of the peripheral wall 13 of the box body 11, even if the wiring box is installed in a conspicuous place, the appearance is good. Moreover, rainwater, dust and concrete do not enter even if the nut insertion opening 18c is not cured.

  (2) Compared with the insert molding method in which the nut 21 is set in the mold and then injection-molded, the molding speed is faster, and the nut is tilted in the mounting portion 18 to be inserted after molding. There is also no need for a nut state confirmation step after molding.

  (3) Since the nut 21 is inserted from the direction perpendicular to the screwing direction of the mounting screw 22, it is not pushed off by the tip of the mounting screw when the mounting screw is screwed.

  (4) Since the nut insertion port 18c is formed in a direction different from the base end side of the mounting portion 18 from which the nut insertion port 18c protrudes (specifically, inward of the box body), there is no need to make the base end of the mounting portion hollow. It can form strongly with respect to the load concerning an attaching part.

In addition, you may change each said embodiment as follows.
In each of the above embodiments, the frictional force between the inner surface of the nut housing space 18b and the outer surface of the nut 21 is increased to prevent the nut housing space 18b from falling off and to prevent rattling in the nut housing space. A portion slightly narrower than the thickness or width of the nut may be formed in the nut accommodating space, and the nut may be forcibly press-fitted and installed in the mounting portion 18.
The nut 21 has been described as an example in which a screw hole is formed in a hexagonal plate, but the outer shape may be square or octagon, and may be a cylindrical body instead of a flat plate shape. . The nut is not limited to a nut that can be screwed and unscrewed only by screwing the mounting screw 22, but is elastically deformed to allow entry by pushing the mounting screw, and is locked to the shaft outer surface of the mounting screw by its return force. Thus, it may be a nut having springiness to prevent the slipping out.

In the first embodiment, the mounting portion 18 has been described with the wiring box 10 in which one pair is formed. However, the wiring box has a large size (for example, a horizontally long rectangular shape), and a plurality of sets are arranged side by side. May be mounted side by side.
-You may form the meat steal which penetrates the bottom wall 12 in the bottom wall 12 for weight reduction and material reduction. At this time, by fixing the wiring box 10 to the building wall 41 by bringing the bottom wall 12 into contact therewith, the visible portion of the wiring box becomes the peripheral wall and the opening (front surface) side, and is formed on the bottom wall (the bottom wall). (Meat stealing) does not affect the appearance.
-A fixing hole for fixing to the building wall may be formed through the bottom wall 12 in advance.

In the first embodiment, a plurality of through holes 14 and / or through hole formation scheduled portions 15 may be formed.
-Although the closing plate described as the closing portion 15a of the through-hole formation scheduled portion 15 is integrally formed by being connected to the peripheral wall 13 by the thin-walled connecting portion 15b, as shown in FIG. The through-hole formation scheduled portion 15 may be configured by screwing or fitting into the through-hole 14 formed in the peripheral wall and closing the through-hole.
-Although the through-hole formation scheduled part 15 and the through-hole 14 are provided in the surrounding wall 13, you may provide in both the surrounding wall 13 and the bottom wall 12 only in the bottom wall 12. FIG.
The through hole may be formed by drilling the peripheral wall or the bottom wall using a drilling tool such as a drill.
-Although only one through hole 14 is formed in advance, if the number to be used is specified in advance, a plurality of through holes may be formed in advance, and all of the through holes can be removed. It is good also as a through-hole formation scheduled part obstruct | occluded with the obstruction board. In this case, there is no through-hole penetrating the peripheral wall and the bottom wall over the entire peripheral wall and the bottom wall by the through-hole formation scheduled portion.

-In 1st embodiment and 2nd embodiment, although the example which attaches a wiring apparatus to the attaching part 18 demonstrated, you may attach the box cover which obstruct | occludes the whole opening of a wiring box, or a part of opening.
Although the outer shape of the wiring box 10 is a square shape, it may be a horizontally long rectangular shape, an octagonal shape, or a round shape as shown in FIG. At that time, the box cover 61 that closes the opening attached to the wiring box is changed to a similar shape. In FIG. 11, the box cover has a round shape, and the entire wiring box opening can be closed. Even in the case of a round shape, it is possible to insert a nut using a slide piece that forms a part of a round peripheral wall by making the opening direction of the nut insertion port of the mounting portion substantially the same as the moving direction of the slide piece. The mouth and the nut receiving space can be formed.
-The separate connector 45 of the cable protection tube attached so as to project outward from the box body may be a connecting portion formed integrally with the peripheral wall of the wiring box. Further, the connecting portion may be provided so as to protrude only on the inner side of the peripheral wall, or on both the outer side and the inner side of the peripheral wall, without protruding only on the outer side of the peripheral wall 13. Further, the cable protection tube 46 may be directly connected to the through hole of the peripheral wall without using a connecting tool. Furthermore, the cable protection tube may be inserted into the wiring box through the peripheral wall 13.
The cable protection tube 46 may be a tube having a smooth hollow cylindrical outer surface, a corrugated tube, a protection duct composed of a base and a lid, and a connector ( The connection with the connection portion may not be an adhesive.

  In the first embodiment, the attachment portion 18 is formed to protrude from the opening side of the peripheral wall and away from the bottom wall 12, but may be formed to protrude from the peripheral wall continuously to the bottom wall.

  In the second embodiment, the box cover mounting portions 18 are described as an example provided in a pair at substantially diagonal positions, but the position and number can be arbitrarily changed as long as the box cover can be fixed.

  -In 2nd embodiment, if concrete does not penetrate | invade, the through-hole for attaching the box support which fixes a wiring box in a formwork etc. may be formed in a surrounding wall or a bottom wall.

  In the third embodiment, the standing wall 64 is erected so as to rise from the closing plate portion 62 toward one side (front side), but toward the other side (back side) or toward both sides thereof. It may be erected. In addition, when the standing wall is erected toward the other side, one surface of the closing portion comes into contact with the mold.

The perspective view which shows the wiring box of 1st embodiment. Sectional drawing which shows a box main body, and the partial expansion perspective view which shows an attaching part. The longitudinal cross-sectional view and flat sectional view of a wiring box. The schematic diagram of the metal mold | die structure which shape | molds the box main body of 1st embodiment. The longitudinal cross-sectional view which shows the use condition of 1st embodiment. The perspective view and longitudinal cross-sectional view which show the wiring box of 2nd embodiment. The longitudinal cross-sectional view which shows the state which embedded the wiring box of 2nd embodiment in concrete. The longitudinal cross-sectional view which shows the state by which the box cover was attached to the wiring box of 2nd embodiment, and the concrete was embed | buried. The perspective view which shows the box cover of 3rd embodiment. The longitudinal cross-sectional view which shows the state which attached the box cover of 3rd embodiment to the wiring box, and embedded concrete. The perspective view which shows the wiring box of another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wiring box 11 Box main body 12 Bottom wall 13 Perimeter wall 14 Through-hole 15 Through-hole formation scheduled part 18 Mounting part 18a Insertion hole 18b Nut accommodating space 18c Nut insertion port 21 Nut 22 Mounting screw

Claims (8)

A nut housing comprising a bottom wall and a peripheral wall standing upright from the bottom wall and having an opening on one side, and a nut into which a mounting screw for attaching a wiring device or a box cover is screwed into the peripheral wall. A wiring box comprising a box body having a mounting portion formed with a space and projecting inwardly from the peripheral wall, and a nut provided in the mounting portion,
In the mounting portion, a nut insertion port capable of installing a nut in the nut receiving space is in a direction orthogonal to the screwing direction of the mounting screw and opens toward the inside of the box body. The wiring box, wherein the nut housing space is isolated from the outside of the box body with a peripheral wall therebetween.   2. The wiring according to claim 1, wherein the attachment portion is formed in a pair with opposing peripheral walls, and the nut insertion port is formed so as to face each other between the pair of attachment portions. box. It is a wiring box that is fixed with the bottom wall facing the wall side of the building in order to be installed with the entire wall surface exposed.
A through hole for guiding a cable into the box body is formed in the peripheral wall, and only the through hole passes through the peripheral wall to communicate the inside of the box body with the outside. The wiring box according to 2. It is a wiring box that is fixed with the bottom wall facing the wall side of the building in order to be installed with the entire wall surface exposed.
The peripheral wall is provided with one or a plurality of through-hole forming scheduled portions for forming a through-hole for guiding the cable into the box body,
The through-hole formation scheduled portion includes a removable blocking portion, and the through-hole can be formed by removing the blocking portion. Further, the inside of the box main body and the outside are in communication over the entire peripheral wall. The wiring box according to claim 1, wherein there is no wiring box. It is a wiring box installed with the entire wall surface exposed,
3. The wiring box according to claim 1, wherein the peripheral wall and the bottom wall are not communicated with each other inside and outside the box body. A wiring box embedded in a concrete wall,
The peripheral wall and / or the bottom wall is formed with one or a plurality of through-hole forming scheduled portions for forming a through-hole for guiding a cable into the box body, and the through-hole forming planned portion is a removable blocking portion The wiring box according to claim 1, wherein the through-hole can be formed by removing the blocking portion.   The nut insertion opening that opens toward the inside of the box body and the nut housing space form at least a part of the inner surface of the peripheral wall that is in the vicinity of the mounting portion of the peripheral wall provided with the mounting portion. The wiring box according to claim 1, wherein the wiring box is formed together with the inner surface of the peripheral wall at the time of injection molding by a slide piece of a mold that slides in a direction. A part of the opening of the wiring box is fixed to the opening side of a box-like wiring box having an opening on one side, and a nut into which a mounting screw for mounting the wiring device is screwed. A box cover that closes and leaves
The box cover has a fixing portion fixed to the box, and a closing portion that closes the opening of the box,
A through-opening is formed in a part of the closed part so as to face a part of the opening of the box outward,
The through-opening is formed with a mounting portion having a nut housing space in which the nut is housed,
In the mounting portion, a nut insertion port capable of installing a nut in the nut receiving space opens in the direction perpendicular to the screwing direction of the mounting screw and toward the inside of the through opening. A box cover characterized by being provided in.

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