JP2017034771A - Airtight box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight box which can be assembled to a housing body such as a wiring box that is disposed on a rear side of a wall, with high workability by determining an insertion position of a peripheral wall of a main body within an inserted port of the housing body, and further prevent airtightness from being impaired by bending and deforming a flange part during the assembly to the housing body with the determination of a position of the peripheral wall of the main body.SOLUTION: The airtight box comprises a box body 11 including a peripheral wall 12 forming an opening 14 and a bottom wall, and a flange part 21 which is provided in an end portion of the opening 14 of the box body 11 while being expanded outwards. The airtight box is formed from a soft material. In the peripheral wall 12 of the box body 11, a projecting strip part 17 abutted to an inner peripheral surface 43 of an opening 42 of a box cover 41 for determining the insertion position of the peripheral wall 12 within the opening 42 is provided to extend from a side of the opening 14 of the box body 11 to a side of the bottom wall. The projecting strip part 17 is provided in the vicinity of a rigid part formed from a corner 16 of the peripheral wall 12 of the box body 11.SELECTED DRAWING: Figure 1

Description

  The present invention is made of a soft material such as a soft synthetic resin material or a rubber material, the main body is inserted into an opening of a wiring box or the like on the back of the wall, and the flange portion is in close contact with the front surface of the wall, airtight, dustproof, soundproof, etc. It relates to a hermetic box used in the box.

  The wiring box and coating allowance cover opening on the back side of the wall or the opening of the through hole formed in the wall are made of soft synthetic resin material or rubber material for airtightness, dustproof, soundproofing, etc. Therefore, an airtight box having a flange portion in close contact with the wall surface is used. The airtight box has a mounting screw inserted through a pair of mounting holes such as a wiring fixture mounting frame disposed on the front side of the opening, and the mounting screw passes through a pair of insertion holes provided in the flange portion of the airtight box. Further, by being attached to screw holes provided at corresponding locations of the wiring box or the like, it is sandwiched and attached between the wiring device mounting frame and the wall material. Techniques relating to this type of hermetic box are described in Patent Document 1 and Patent Document 2, for example.

JP 2011-61897 A JP 2014-222965 A

  By the way, the opening of the wiring box behind the wall is formed to be slightly larger than the outer dimension of the peripheral wall of the hermetic box because the peripheral wall of the main body of the hermetic box is inserted therein. Therefore, there is a slight gap between the outer surface of the peripheral wall of the hermetic box and the periphery of the opening of the wiring box, and the peripheral wall of the hermetic box can move slightly in the vertical and horizontal directions within the plane of the opening of the wiring box. Therefore, the insertion hole of the flange portion and the screw hole of the wiring box or the like are easily displaced. In the airtight box, the mounting screw is inserted into the screw hole of the wiring box installed on the back of the wall from the wall side, and it is screwed. If the hole and the screw hole of the wiring box or the like are slightly displaced in the vertical and horizontal directions, it is quite difficult and troublesome to screw the mounting screw to the position of the screw hole of the wiring box.

  Therefore, it is conceivable to provide means for positioning the insertion hole of the flange portion and the screw hole of the wiring box or the like. As a positioning means, a protrusion that abuts the inner peripheral surface of the main body of the hermetic box in accordance with the size of the opening of the wiring box is provided so that the peripheral wall of the hermetic box can freely move within the opening of the wiring box. It is conceivable that the positioning is performed with regulation. In this case, since the opening of the wiring box varies in manufacturing size, the protrusion as the positioning means normally protrudes in accordance with the center of the dimensional variation in the opening of the wiring box as a reference position. Set to length.

  However, if the projection length of the protrusion on the peripheral wall of the hermetic box is set to the above-mentioned reference value, if the opening of the wiring box is smaller than that, naturally the tip of the hermetic box is outside the opening of the wiring box. When the peripheral wall is inserted into the opening of the wiring box, it is forced into the opening. As a result, a large pressing force is applied from the inner peripheral surface of the opening of the wiring box, so that the peripheral portion of the protrusion on the peripheral wall of the airtight box made of a soft material is greatly deformed and the entire body is greatly deformed and the flange portion is also distorted. . If the flange portion is distorted and bent and deformed, a gap is formed between the flange portion and the wall surface, and thus airtightness is lost.

  At that time, as described in Patent Document 2, it is conceivable to integrate the core material into the flange portion by insert molding or the like to forcibly prevent the flange portion from being bent and deformed. It is necessary to provide a core material separately, increasing the number of steps for integrating the core material and increasing the cost.

  Therefore, the present invention determines the insertion position of the peripheral wall of the main body in the insertion port of the container such as a wiring box disposed on the back of the wall, thereby being able to be assembled to the container with good workability. It is an object of the present invention to provide an airtight box capable of preventing the flange portion from being bent and deformed when the peripheral wall of the main body is assembled to prevent the airtightness from being impaired.

An airtight box according to claim 1 comprises a box body having a peripheral wall forming an opening and a bottom wall, and a flange portion provided to project outward from the opening end of the box body, and is made of a soft material. The peripheral wall of the box body is in contact with or close to the inner peripheral surface of the insertion port of the container that is inserted and accommodated from the bottom wall side. A ridge that defines the insertion position of the peripheral wall is provided so as to extend from the opening side of the box body toward the bottom wall.
Here, the protruding portion includes not only the protruding portion itself but also a peripheral portion related to it.
The container is the one in which the peripheral wall of the box body is inserted and accommodated from the bottom wall side, specifically, the wiring box, the coating allowance cover attached to the wiring box, and the penetration formed in the wall For example, holes.
Specifically, the insertion opening corresponds to an opening of a wiring box, an opening of a coating allowance cover, an opening of a through hole formed in a wall, or the like.

In the airtight box according to the second aspect of the invention, in particular, the protruding portion is provided in the vicinity of a rigid portion extending in the depth direction and formed in a part of the peripheral wall of the box body.
Here, the rigid portion corresponds to a corner portion where two surfaces such as planes, curved surfaces, planes and curved surfaces intersect, or a portion where a reinforcing rib or the like is provided and is thick, and external force is applied. This means a place that is difficult to deform.
In addition, the vicinity of the rigid portion means that even if the ridge portion is deformed inward by contacting the inner peripheral surface of the insertion port of the container, the effect of the ridge portion is not affected by the action of the rigid portion, A peripheral portion of the rigid portion that does not reach the deflection of the flange portion.

In particular, the airtight box of the third aspect has a fragile portion in which the protruding portion is pressed against the inner peripheral surface of the insertion opening of the insertion body and the protruding length to the outside thereof is displaced.
Here, the weak part corresponds to a part where both side surfaces are formed thin and hollow, a part formed thinner than the peripheral wall, and the like.

  Since the invention of claim 1 is provided with a ridge portion on the peripheral wall of the box body, which is in contact with or close to the inner peripheral surface of the insertion port of the container, and determines the insertion position of the peripheral wall in the insertion port. As a result of positioning the peripheral wall at the insertion port when the peripheral wall is inserted into the insertion port of the container, the hermetic box can be assembled to the container with good workability. Here, the container disposed on the back of the wall has a different distance to the flange portion of the hermetic box depending on the thickness of the wall surface, but since the protrusion of the hermetic box is provided along the depth direction of the peripheral wall, The protruding portion can be brought into contact with or close to the inner peripheral surface of the insertion opening of the container at any position in the depth direction, and thus the peripheral wall can be reliably positioned.

  In the invention of claim 2, in particular, since the protrusion is provided in the vicinity of the rigid portion extending in the depth direction formed in a part of the peripheral wall of the box body, the airtight box is assembled to the container. It is possible to prevent the flange portion from being bent and deformed when being attached. That is, as described in claim 1, the protrusion is provided as a positioning means on the peripheral wall, but the insertion port of the container has a variation in the size after manufacture. In a state where the protruding length is set corresponding to the insertion opening having the reference size of the container, if the insertion opening of the container to be actually assembled is formed slightly smaller, the ridge portion is The box body is forcibly pushed into the insertion opening, is pressed inward by the inner peripheral surface of the insertion opening, the box body is greatly bent and deformed, and the flange portion is distorted. However, in the invention of claim 2, since the ridge portion is provided in the vicinity of the rigid portion on the peripheral wall, the periphery of the ridge portion is deformed, but the effect of the deformation of the ridge portion is caused by the action of the rigid portion. It is blocked from reaching the flange part. As a result, it is possible to prevent the flange portion from being bent and deformed when the airtight box is assembled to the container. Thereby, it can prevent that a clearance gap produces between a wall surface side surface and a flange part, and can prevent that the airtightness by an airtight box is impaired.

  In the invention of claim 3, in particular, since the protruding portion has a fragile portion in which the protruding length to the outside of the protruding portion is displaced, when the inserted port is formed to be small, the protruding portion is inserted into the inserted port. When it is pressed inward by the inner peripheral surface, it retreats inwardly. For this reason, even when the insertion opening is formed to be small, when the airtight box is assembled to the container, it is possible to suppress the box body from being greatly bent and deformed by the displacement of the protruding length of the protrusion. Further, it is possible to more reliably prevent the flange portion from being bent and deformed to cause a gap between the wall surface side surface and the flange portion.

It is a disassembled perspective view which shows the arrangement | positioning in which the airtight box of embodiment of this invention is attached in installation of the sensor to a wall surface. It is a longitudinal cross-sectional view which shows the state in which the airtight box of FIG. 1 was attached. FIG. 2 shows another box cover of FIG. 1, (a) is a perspective view, and (b) is a longitudinal sectional view. The airtight box of FIG. 1 is shown, (a) is the perspective view seen from the front side of opening, (b) is the perspective view seen from the back side. Similarly, FIG. 1 shows the airtight box, (a) is a front view, (b) is a right side view, (c) is a rear view, (d) is a cross-sectional view taken along the line AA in (a), (e ) Is a cross-sectional view taken along the line BB of FIG. It is sectional drawing which shows the insertion position of the surrounding wall of an airtight box in opening of the box cover of FIG. It is the C section enlarged view of FIG. It is principal part sectional drawing which shows the modification of the protrusion part of FIG. 4A and 4B show another example of the rigid portion and the protruding portion of the hermetic box of FIG. 4, in which FIG. 4A is a perspective view, and FIG. 9A and 9B show a rigid portion and a ridge portion, and FIG. 9A is a cross-sectional view taken along the line DD in FIG. 9B, and FIG. It is a perspective view which shows the modification of the flange part of the airtight box of FIG.

  Hereinafter, an airtight box according to an embodiment of the present invention will be described with reference to the drawings. A wiring device such as a wiring switch or a sensor is attached to a wall surface such as a ceiling wall or an indoor wall from the front side of the wall. In this embodiment, the case where a sensor is attached to the wall surface of an indoor wall is illustrated.

  In FIG. 1 and FIG. 2, a wiring box 31 and a box cover 41 attached to the opening 32 are disposed on the back of the wall, and a cable wired in the back wall space relays the wiring box 31 to the wall surface. A configuration connected to the sensor 51 is shown. Between the wiring box 31 and the box cover 41 and the sensor 51, the airtight box 1 is attached for airtightness, dustproofing and soundproofing between the inside and outside of the wall surface 61. The airtight box 1 includes a box main body 11 and a flange portion 21, and the box main body 11 is inserted into the opening 42 of the box cover 41 on the back of the wall and the opening 32 of the wiring box 31. By close contact with each other, the inside and outside of the wall surface 61 are made airtight. Hereinafter, each component will be described.

  First, as shown in FIG. 1, the wiring box 31 is formed in a rectangular bottomed box shape having a side wall 33 and a bottom wall 34 and having an opening 32 on one surface, and is formed of a synthetic resin or a metal plate. . The side wall 33 and the bottom wall 34 of the wiring box 31 are provided with cable insertion holes 35 that are opened by punching and into which cables are inserted. Plate-shaped projecting pieces 36 are projected inward at four positions on the periphery of the opening 32 so as to be orthogonal to the surface of the side wall 33, and a screw hole 37 into which a screw is screwed is formed at the center. Yes.

  A box cover 41 disposed in front of the opening 32 of the wiring box 31 is formed in a rectangular flat plate shape using a synthetic resin material or a metal material as shown in FIGS. A circular opening 42 through which is inserted is formed. A pair of substantially semi-disc shaped projections 44 projecting inwardly are provided at the upper and lower ends of the inner peripheral surface 43 of the opening 42, and a screw hole into which a mounting screw 71 is screwed at the center of each projection 44. 45 is provided. The center of each screw hole 45 is located on the vertical center line L1 of the box cover 41 as shown in FIG. An intermediate point between the pair of upper and lower screw holes 45 is located on a center axis O in the depth direction of the box body 11 described later.

  Further, at the four corners of the box cover 41, cutout holes 46 and long holes 47 are provided at positions corresponding to the screw holes 37 of the wiring box 31, and the screws are inserted into the cutout holes 46 and the long holes 47 for wiring. The box cover 41 can be fixed to the opening 32 side of the wiring box 31 by being screwed into the screw hole 37 of the box 31. The box cover 41 is integrated with the wiring box 31, thereby constituting the container of the claims together with the wiring box 31. Moreover, the opening of the wiring box 31 and the box cover 41 constitutes the insertion port of the claims.

  Note that the box cover 41 shown in FIG. 3 may be fixed to the front surface of the wiring box 31 instead of the rectangular flat box cover 41. The box cover 41 in FIG. 3 is formed in a rectangular flat plate shape, and a circular projecting ring 48 is erected on the peripheral edge of the central opening 42 on one side so as to reach the entire circumference and orthogonal to the plane. Long holes 47 are formed at the four corners of the planar portion.

  In this embodiment, the case where the center opening 42 of each box cover 41 is 70 mm is illustrated. Here, when the box cover 41 is formed of a synthetic resin material, dimensional variations due to heat shrinkage during molding occur. When the box cover 41 is formed of a metal material, press working such as drawing is performed. Causes dimensional variations associated with The box cover 41 of the present embodiment will be described on the assumption that the reference value is 70.0 mm and the variation in product dimensions is within a range of ± 0.4 mm.

  On the other hand, the hermetic box 1 according to the present invention is made of a soft material such as soft synthetic resin or rubber, and the box body 11 has a cylindrical shape having an opening 14 at one end, as shown in FIGS. The peripheral wall 12 and a bottom wall 13 that closes the other end of the peripheral wall 12 are formed. The peripheral wall 12 has a pair of parallel planes formed vertically, and a pair of arcuate surfaces facing each other is formed on the left and right, and the longitudinal section has a shape close to a track or oval for athletics. A plurality of recesses 15 are formed in the bottom wall 13, and these recesses 15 are formed to be thin and can be broken through at the end of the cable. This is to ensure the airtightness of this part when it is penetrated through a cable. In addition, you may apply | coat a sealing agent etc. to the circumference | surroundings of the hole pierced after inserting a cable as needed.

  In the peripheral wall 12 of the box body 11, the depth direction of the four corners 16, ie, the direction from the opening 14 toward the bottom wall 13, which is a part of the circumferential direction and intersects the upper and lower parallel surfaces and the pair of left and right arc surfaces. The portion that extends to is a portion that has high rigidity and is difficult to bend and deform by an external force. The portion having high rigidity formed by the corner portion 16 constitutes the rigid portion of the claims.

  A total of four protrusions 17 having an arc-shaped constant cross-sectional shape along the depth direction are provided in the vicinity of being slightly separated from each rigid portion. Each protrusion 17 is on a pair of left and right circular arc surfaces of the peripheral wall 12, and a circle connecting the tip of the protrusion 17, that is, the outermost part 17a, has a diameter of 70.0 mm. All four ridges 17 are formed in the same cross-sectional shape, and FIG. 7 from the central axis O shown in FIGS. 4 and 6 toward the depth direction of the box body 11 to the outermost portion 17a of the ridge 17 is shown. The four distances R are all the same.

  Here, the vicinity of the rigid portion is the periphery of the rigid portion, and even if the ridge portion 17 is bent and deformed inward by an external force, the flange portion 21 is affected by the bending deformation of the ridge portion 17 due to the action of the rigid portion. This is the part of the range that does not reach and bend and deform. Here, since the corner portion 16 is formed in the depth direction of the peripheral rigid portion, the protrusion 17 extending in the peripheral depth direction is always located in the vicinity of the rigid portion.

  Further, as described above, the opening 42 of the box cover 41 in the present embodiment has a reference value of 70.0 mm and a dimensional variation of ± 0.4 mm. In order to position the peripheral wall 12, the diameter of the circle formed through the outermost part 17a of the four protrusions 17 corresponds to the reference value of the opening 42 of the box cover 41, as described above. It is formed to 70.0 mm. Therefore, when the diameter of the opening 42 of the box cover 41 actually manufactured is just 70.0 mm and the inner peripheral surface 43 is at the position indicated by the solid line in FIG. Corresponds to the position of the inner peripheral surface 43 of the opening 42 of the box cover 41.

  And the diameter of the opening 42 of the box cover 41 actually manufactured is in the range from the reference value of 70.0 mm to +0.4 mm, and the inner peripheral surface 43 is in the position indicated by the one-dot chain line in FIG. In some cases, a very slight gap is formed between the outermost part 17 a of the ridge 17 and the inner peripheral surface 43 of the opening 42 of the box cover 41.

  On the other hand, the diameter of the opening 42 of the box cover 41 actually manufactured is in a range smaller than the reference value of 70.0 mm to −0.4 mm, and the inner peripheral surface 43 is in a position indicated by a two-dot chain line in FIG. At this time, the position of the outermost portion 17a of the protrusion 17 protrudes outside the inner peripheral surface 43 of the opening 42 of the box cover 41. It is forcibly pushed into the opening 42 and is pressed by the inner peripheral surface 43 of the opening 42. And the peripheral wall 12 of the peripheral part including the protrusion part 17 bends and deforms inside, and the outermost part 17a of the protrusion part 17 retreats inside.

  Next, as shown in FIGS. 4 and 5, the flange portion 21 is formed in a ring plate-like plane, and is provided on the opening end of the peripheral wall 12 of the box body 11 so as to project outward in a hook shape. The central part is an opening 14 of the peripheral wall 12. A pair of thin recessed portions 22 that are recessed in a substantially oval shape are formed at the upper and lower positions of the flange portion 21, and an insertion hole 23 through which the mounting screw 71 can be inserted is formed on the bottom surface. As shown in FIG. 4, the center of each insertion hole 23 is located on the center line L <b> 2 in the vertical direction of the flange portion 21. And the midpoint of a pair of upper and lower insertion holes 23 is located on the central axis O shown in FIG. Furthermore, the distance between the pair of upper and lower insertion holes 23 is the same as the distance between the pair of upper and lower screw holes 45 of the box cover 41.

  In addition, a shallow annular groove 24 having a constant width is formed on the surface of the flange portion 21 on the side facing the wall surface 61. The groove 24 is formed of an annular thin plate to further improve the close contact. A packing 25 made of a soft synthetic resin material or a rubber material is fitted. However, the packing 25 is not necessarily required, and it may be attached when necessary for improving airtightness.

  Next, as shown in FIGS. 1 to 3, the sensor 51 installed on the wall includes a sensor body 52 and an instrument frame 53 for mounting the sensor body 52. The instrument frame 53 is provided with an attachment hole 54 to which the attachment screw 71 is attached.

  Here, the positional relationship of the insertion hole 23 of the flange portion 21 with respect to the screw hole 45 of the box cover 41 will be described. When the circle passing through the outermost part 17a of the four ridges 17 of the peripheral wall 12 is the same as or slightly larger than the opening 42 of the box cover 41, the peripheral wall 12 is inserted into the opening 42 of the box cover 41. When arranged, all the outermost parts 17 a of the four ridges 17 of the peripheral wall 12 abut against the inner peripheral surface 43 of the opening 42 of the box cover 41 or are pressed evenly from the inner peripheral surface 43. If the circle passing through the outermost part 17a of the ridge 17 is slightly slightly smaller than the opening 42 of the box cover 41 and the centers of both circles are at the same position, the outermost part of the ridge 17 17a is evenly spaced slightly from the inner peripheral surface 43 of the box cover 41. Therefore, in any case, when the box cover 41 is inserted into the opening 42, the movement of the peripheral wall 12 in the vertical and horizontal directions is restricted by the protrusion 17.

  Further, in the circumferential direction, when the circumferential wall 12 is inserted, if the insertion holes 23 of the flange portion 21 are in phase with the screw holes 45 of the box cover 41 in the circumferential direction, these insertion holes 23 and The screw hole 45 is located on the same line parallel to the central axis O of the box body 11. Therefore, in this case, since the hole positions of the screw hole 45 of the box cover 41 and the insertion hole 23 of the flange portion 21 of the hermetic box 1 coincide with each other, the mounting screw through which the insertion hole 23 of the flange portion 21 of the hermetic box 1 is inserted. 71 can be accurately positioned and accurately inserted into the screw hole 45 of the box cover 41 and screwed.

  Further, when the peripheral wall 12 is inserted, if the insertion hole 23 of the flange portion 21 is positioned in a phase slightly shifted from the screw hole 45 of the box cover 41 in the circumferential direction, the flange portion 21 of the airtight box 1 The hole positions of the insertion hole 23 and the screw hole 45 of the box cover 41 do not completely coincide with each other in the circumferential direction, but in this case, the peripheral wall 12 is centered on the central axis O of the box body 11 in either the left or right direction. The protrusion 17 may be aligned while being slidably contacted with the inner peripheral surface 43 of the opening 42 of the box cover 41 or moved along the inner peripheral surface. As a result, the hole position of the insertion hole 23 of the flange portion 21 is easily adjusted to be aligned with the position of the screw hole 45 of the box cover 41. For these reasons, the protrusion 17 of the peripheral wall 12 serves as positioning means for determining the insertion position of the peripheral wall 12 in the opening 42 of the box cover 41.

Next, attachment of the sensor 51 and the airtight box 1 of the present embodiment to the wall surface 61 will be described.
The tip of the cable wired in the wall space is previously drawn into the wiring box 31 from the cable insertion hole 35, and the box cover 41 is attached to the opening 32 of the wiring box 31 from the front side. The box cover 41 is attached by inserting screws into the cutout holes 46 and the long holes 47 at the four corners of the box cover 41 and screwing them into the four screw holes 37 provided at the periphery of the opening 32 of the wiring box 31. Can be performed. In addition, although not shown, the wiring box 31 is fixed to the pillar on the back of the wall via a fixing screw. Next, the wall material is brought into contact with the front surface of the box cover 41 so that the opening 32 of the wiring box 31 and the opening 42 of the box cover 41 are desired from the wall hole 62, and the cable is predetermined from the wall hole 62 to the wall front side. Pull out long.

  Next, after breaking the recess 15 of the hermetic box 1 at the tip of the cable, the cable is passed through the central hole of the instrument frame 53 and connected to the sensor 51. Next, from the front side of the wall, the mounting screws 71 are inserted into the pair of mounting holes 54 from the front side of the instrument frame 53 of the sensor 51, and the mounting screws 71 are further inserted into the pair of insertion holes 23 of the flange portion 21 of the airtight box 1. After that, the hermetic box 1 together with the instrument frame 53 of the sensor 51 is moved toward the wall hole 62, the peripheral wall 12 of the box body 11 of the hermetic box 1 is inserted into the wall hole 62, and the opening 42 of the box cover 41 and It is inserted into the opening 32 of the wiring box 31. Then, the mounting screw 71 is tightened into the pair of screw holes 45 in the opening 42 of the box cover 41.

  Here, since the protruding portion 17 is formed in the vicinity of the rigid portion of the corner portion 16 of the peripheral wall 12 in the hermetic box 1, the diameter of the opening 42 of the actual box cover 41 is the reference value in the mounting operation. When it is formed in a size of 70.0 mm, the outermost part 17a of all four ridges 17 contacts the inner peripheral surface 43 of the opening 42 of the box cover 41 evenly, so that the inside of the opening 42 The insertion position of the peripheral wall 12 at is determined. After positioning by this, the position of the insertion hole 23 of the airtight box 1 into which the mounting screw 71 inserted through the mounting hole 54 of the instrument frame 53 of the sensor 51 is inserted and the position of the screw hole 45 of the box cover 41 are determined. Therefore, the mounting screw 71 can be smoothly inserted into the screw hole 45 of the box cover 41 and tightened.

  Further, when the diameter of the opening 42 of the actual box cover 41 exceeds the reference value of 70.0 mm and is within the range of +0.4 mm, the outermost portion 17a of the ridge 17 and the opening 42 of the box cover 41 are within the range. Since there is a gap between the peripheral surface 43 and the opening 42 of the box cover 41 may not match exactly as in the standard value of 70.0 mm, the gap is very small. Therefore, the peripheral wall 12 is easily positioned in the opening 42 as well. For this reason, the attachment screw 71 can be smoothly inserted into the screw hole 45 of the box cover 41 as it is and tightened.

  On the other hand, when the diameter of the opening 42 of the box cover 41 is smaller than the reference value of 70.0 mm and within the range of −0.4 mm, the peripheral wall 12 of the box body 11 is inserted into the opening 42 of the box cover 41. At this time, the diameter of the opening 42 of the box cover 41 is smaller than the diameter of the circle connecting the outermost portions 17 a of the four ridge portions 17, so that the outermost portion 17 a of the ridge portion 17 is the periphery of the opening 42 of the box cover 41. It will protrude outside.

  However, since the protrusion 17 is formed of a soft material and is provided in the vicinity of the rigid portion of the corner 16 of the peripheral wall 12, the protrusion 17 is excessive on the inner peripheral surface 43 of the opening 42 of the box cover 41. It abuts and is pressed by the inner peripheral surface 43 and retracts into the inner peripheral surface 43 while being elastically bent and deformed toward the inside, that is, the center side in the box main body 11, and the box main body 11 enters the opening 42 of the box cover 41. Inserted and housed.

  The box cover 41 disposed on the back of the wall has a different distance to the flange portion 21 of the airtight box 1 depending on the thickness of the wall surface 61, but the protrusion 17 of the airtight box 1 extends along the depth direction of the peripheral wall 12. Since it is provided, the protrusion 17 abuts against the inner peripheral surface 43 of the opening 42 of the box cover 41 at any position in the depth direction.

  When the airtight box 1 is attached to the wiring box 31 in this way, the sensor main body 52 is attached to the instrument frame 53 of the sensor 51. Thereby, as shown in FIG. 2, attachment of the sensor 51 and the airtight box 1 to the wall surface 61 is completed. The airtight box 1 can be attached in the same manner when the box cover 41 is formed with the protruding ring 48 shown in FIG. FIG. 3B shows a state where the attachment of the sensor 51 and the airtight box 1 to the wall surface 61 in this case is completed.

Next, the operation of the airtight box 1 of the present embodiment will be described.
In the airtight box 1, the protruding portion 17 that determines the insertion position of the peripheral wall 12 in the opening 42 of the box cover 41 is provided on the peripheral wall 12 of the box body 11, so that the peripheral wall 12 is inserted into the opening 42 of the box cover 41. In doing so, the peripheral wall 12 is positioned within the opening 42. As a result, the airtight box 1 can be assembled to the box cover 41 with good workability. Here, since the peripheral wall 12 is provided so as to extend from the opening 14 side of the box body 11 toward the bottom wall 13 side, the protrusion 17 is always in contact with the inner peripheral surface 43 of the opening 42 of the box cover 41. The peripheral wall 12 can be positioned reliably.

  Further, the airtight box 1 is provided with the protruding portion 17 in the vicinity of the rigid portion formed by the corner portion 16 extending in the depth direction formed in a part of the circumferential wall 12 of the box body 11. It is possible to prevent the flange portion 21 from being bent and deformed when the box 1 is assembled to the box cover 41.

  That is, the protruding portion 17 as the positioning means is provided on the peripheral wall 12, but the opening 42 of the box cover 41 varies in size after manufacture, so that the protruding length of the protruding portion 17 is the box cover 41. When the opening 42 of the actual box cover 41 is formed to be slightly smaller in a state that is set and formed corresponding to the reference position of the diameter of the opening 42, the protrusion 17 is forced into the opening 42. The box body 11 is greatly bent and deformed by the inner peripheral surface 43 of the opening 42, and the flange portion 21 is distorted. However, in the present embodiment, since the protrusion 17 is provided in the vicinity of the rigid portion of the peripheral wall 12, the peripheral portion including the protrusion 17 is elastically deformed, but the protrusion of the protrusion 17 is caused by the action of the rigid portion. It is avoided that the influence of the deformation of the strip portion 17 reaches the flange portion 21. As a result, it is possible to prevent the flange portion 21 from being bent and deformed when the hermetic box 1 is assembled to the box cover 41. Thereby, it can prevent that a clearance gap arises between a wall surface side and the flange part 21, and it can avoid that the airtightness by the airtight box 1 is impaired.

  By the way, although the protrusion part 17 of the said embodiment is protruded and provided in the cross-sectional arc shape from the outer surface of the surrounding wall 12, when implementing this invention, it is not restricted to this, For example, FIG. As shown in FIG. 2, the both side surfaces of the ridge portion 17 reach the entire length of the ridge portion 17 on both sides where the both sides of the ridge portion 17 are connected to the outer surface of the peripheral wall 12, and the arc-shaped concave groove 18 is formed. By forming a flat recess 19 having a constant depth on the inner surface on the opposite side, the peripheral wall 12 may be formed with a reduced thickness.

  In this case, when the protrusion 17 receives a pressing force from the outside, it is easily bent inward. Therefore, since the protruding portion 17 is bent and deformed inward by a relatively small external force and retracted, the influence exerted by the bending deformation on the flange portion 21 is reduced. For this reason, it can avoid more that the flange part 21 bends and deforms. A direction in which the arcuate groove 18 and the planar recess 19 having a certain depth are pressed against the inner peripheral surface 43 of the opening 42 of the box cover 41 and the protruding length of the protrusion 17 outward is shortened. The fragile part of the claim is displaced.

  Moreover, although the rigid part of the said embodiment is formed in this part using the corner | angular part 16 of the surrounding wall 12, as shown in FIG.9 and FIG.10, in the part spaced apart from the corner | angular part 16, it is a U-shaped cross section. Alternatively, a thick portion such as the reinforcing rib 20 may be provided separately at a portion not related to the corner portion 16. 9 and 10, two reinforcing ribs 20 are formed in parallel in the depth direction of the peripheral wall 12. However, the reinforcing rib 20 may form only one of these.

  And in connection with it, you may provide the protrusion part 17 in the intermediate part of the two reinforcement ribs 20 as a rigid part. However, in this case, since the protrusion 17 is provided in the very vicinity of the rigid portion formed by the two reinforcing ribs 20, the solid arc-shaped member shown in FIG. Hateful. Therefore, in order to make it easy to bend and deform | retreat inside and to make it easy to reverse | retreat, as shown in FIG.10 (b), the protrusion part 17 is hollow and forms both sides | surfaces thinly. The portion in which the inside is formed hollow and the both side surfaces are formed thinly constitutes the fragile portion of the claims.

  In addition, the protrusion 17 of the peripheral wall 12 of the box body 11 of the above embodiment is formed by setting the protrusion length corresponding to the reference value of the manufacturing variation in the diameter of the opening 42 of the box cover 41. However, the present invention is not necessarily limited to this, and does not preclude setting and forming the protrusion length corresponding to the maximum value of the variation.

  Furthermore, when the protrusion 17 is pressed by the inner peripheral surface 43 of the opening 42 of the box cover 41 and is bent and deformed inward, the outer peripheral edge portion which is a free end in the flange portion 21 is easily bent and deformed locally. . Therefore, in order to suppress the deformation of the part more stably, as long as there is no problem in the attachment of the instrument frame 53 to the flange part 21, as shown in FIG. A reinforcing rib 26 having a predetermined length may be provided along the circumferential direction at a position corresponding to the corner portion 16 of the rigid portion.

In addition, although the protrusion 17 of the above embodiment is formed in an arc shape or the like, it is not limited to these shapes.
In the airtight box 1 of the above embodiment, the peripheral wall 12 of the box body 11 is formed in a shape including upper and lower parallel surfaces and left and right arc surfaces, and the flange portion 21 is formed in a circular ring plate shape. However, the shape is not limited to these shapes, and the peripheral wall 12 may be formed in a cylindrical shape, a rectangular tube shape, or the like, or the flange portion 21 may have a rectangular outer shape.

In the above embodiment, the sensor 51 is installed on the wall surface 61, but the present invention is similarly applied to the case where a wiring device such as a wiring switch is installed on the wall surface 61.
In the above embodiment, the box cover 41 is attached to the wiring box 31 on the back of the wall, but the same applies to the wiring box 31 that is not attached to the box cover 41 and is directly attached to the back of the wall. Applies to
Furthermore, in the said embodiment, although the wiring box 31 and the box cover 41 are illustrated as a container in which the surrounding wall 12 of the airtight box 1 is inserted and accommodated from the bottom wall 13 side, a container is these boxes etc. It is not restricted to, The through-hole formed in the wall may be sufficient. In this case, the insertion opening is an opening of a through hole in the wall.

1 Airtight box 19 Recessed part (fragile part)
11 Box body 20 Reinforcement rib (rigid part)
12 peripheral wall 21 flange part 13 bottom wall 31 wiring box (container)
14 Opening 41 Box cover (container)
16 Corner part (rigid part) 42 Opening (insertion target)
17 ridge portion 43 inner peripheral surface 18 concave groove (fragile portion)

Claims (3)

A box body having a peripheral wall forming an opening and a bottom wall, and a flange portion provided to project outward from the opening end of the box body, and an airtight box made of a soft material,
The peripheral wall of the box body defines the insertion position of the peripheral wall in the insertion port in contact with or close to the inner peripheral surface of the insertion port of the container that is inserted and accommodated from the bottom wall side. An airtight box, wherein the protrusion is provided so as to extend from the opening side of the box body toward the bottom wall side.   2. The airtight box according to claim 1, wherein the protruding portion is provided in the vicinity of a rigid portion that extends in a depth direction and is formed in a part of the peripheral wall of the box body.   3. The protruding portion according to claim 1, wherein the protruding portion has a fragile portion that is pressed against an inner peripheral surface of an insertion port of the insertion body and has a protruding length outwardly displaced. Airtight box.

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