JP2008193793A - Fixture tool on wall hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a part cost by enabling one type to be fixed on wall hole of a multiple types of walls and easily fixing it without much labor by an operation from any one side of the surface and backside for the wall. <P>SOLUTION: A fixture includes a main body 2 having a wiring member inserted through its inside and formed like a cylinder; and an attaching portion 3 provided on the outside of the main body 2 and attached on a through hole 43 of a wall 42. The attaching portion 3 is provided with a locking portion 17 inserted through the through hole 43 and locked with the circumferential edge of the wall rear side, and an abutting portion 10 abutting on the circumferential edge of the wall surface side of the through hole 43. The outside of the main body 2 is provided with an elastic piece 11 extending toward a reverse insertion side at a base end of an insertion side into the through hole 43, to be warped in the inside of the main body 2 when passing through the through hole 43 and to be elastically restored to the outside of the main body 2 after passing through the through hole 43. The plurality of locking portions 17 is stepwise provided on the elastic piece 11 where the free end 15 is provided so as to correspond to a plurality of kinds of wall thickness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixing device for a wall hole, such as a bushing or a connector, which is fixed to a through-hole formed in a wiring box, a switchboard, a wall of a building or the like, and into which a wiring material such as a cable is inserted. In particular, the present invention relates to a fixture for a wall hole that can be attached in accordance with a plurality of types of wall thicknesses.

  Conventionally, a wiring material such as a cable is drawn from the outside through a through hole formed in a wall of a wiring box, a distribution board, or the like, or is drawn to the outside. The wiring box or the like is formed of a metal plate or a synthetic resin plate, and the through hole is formed in advance on the wall, or formed by knockout punching or the like. For this reason, when the wiring member is drawn into or pulled out from the through hole, the peripheral portion of the through hole may be rubbed and damaged or disconnected. When the wiring material is disconnected, there is a risk that the internal core wire is exposed and short-circuited. Therefore, the wiring member is protected by fixing a fixing tool such as a bushing or a connector covering the peripheral edge of the through hole to the through hole.

  Here, as a fixture fixed to the wall hole, for example, a bushing 51 shown in FIG. In the bushing 51, an insertion opening 53 to be inserted into the through hole 43 of the wall 42 of the wiring box 41 is formed on one end side of the short substantially cylindrical main body 52, and the wall surface side peripheral edge 44 of the through hole 43 is formed on the other end side. An annular plate-shaped flange portion 54 that comes into contact with is provided.

  Further, at four positions equally spaced in the circumferential direction of the main body 52, elastic pieces 56 are formed on the contact surface 55 that contacts the wall surface side peripheral edge 44 of the through hole 43 in the flange portion 54 toward the insertion opening 53. Is erected. The elastic piece 56 is integrally provided with a locking claw 57 that elastically locks to the peripheral edge 45 on the wall back side of the through hole 43 at the free end side, that is, the distal end portion on the insertion opening 53 side. In the central space of the annular plate-shaped flange portion 54, a protective film 58 is formed integrally with a slit formed radially from the central small hole 59 toward the outer peripheral side. The insertion of C is allowed and dust, water and the like are prevented from entering the wiring box 41 from the outside.

  In order to attach and fix the bushing 51 to the through hole 43 of the wiring box 41, the main body 52 is inserted into the through hole 43 from the insertion opening 53 side against the elastic force to the outer peripheral side of the elastic piece 56, and Push in until the abutment surface 55 of the portion 54 abuts against the wall surface peripheral edge 44 of the through hole 43. Thereby, the locking claw 57 of the bushing 51 is elastically locked to the wall back side peripheral edge 45 of the through hole 43 and is fixed to the through hole 43.

  However, the conventional bushing 51 shown in FIG. 7 has a constant wall thickness as shown in FIG. 7B because the distance between the flange 54 and the locking claw 57 of the elastic piece 56 is constant. It can only be fixed corresponding to the through hole 43, and when the wall thickness is different, a bushing 51 corresponding to it must be prepared each time. For this reason, many types of bushings 51 are required, the cost of parts is increased, and parts management is troublesome.

  On the other hand, a bushing 61 shown in FIG. 8 is used as another fixture that is fixed to the wall hole. The bushing 61 shown in FIG. 8 includes two members, a pair of bolt bodies 62 and a nut body 63. Further, the bolt body 62 is formed by a cylindrical body 64 having an external thread on the outer surface, and a flange 65 having a central hole and integrally formed at one end of the cylindrical body 64. The nut body 63 is assembled with the bolt body 62 by a female screw formed on the inner surface of the nut body 63 being screwed onto a male screw on the outer surface of the bolt body 62.

  In order to attach and fix the bushing 61 to the through hole 43 of the wiring box 41, the cylindrical body 64 of the bolt body 62 is inserted into the through hole 43 from the back side of the wall, and the flange portion 65 is inserted into the peripheral edge 45 of the back side of the wall 42. Then, the nut body 63 is assembled from the wall surface side to the cylindrical body 64 of the bolt body 62 protruding to the wall surface side. Accordingly, the bushing 61 is fixed to the through hole 43 in a state where the flange 42 of the bolt body 62 and the nut body 63 sandwich the peripheral wall 42 of the through hole 43.

When the bushing 61 is used, the flange portion 65 of the bolt body 62 and the nut body 63 sandwich the peripheral wall 42 of the through hole 43 and fix it to the through hole 43. It can fix corresponding to the through-hole 43 of wall thickness. This type of bushing is disclosed in Utility Model Registration No. 30733962.
Utility Model Registration No. 3073396

  However, the bushing 61 composed of the bolt body 62 and the nut body 63 has the bolt body 62 disposed on the back side of the wall with the wall 42 as a boundary, and the nut body 63 disposed on the front side of the wall. In the case where the wall 42 is fixed to a large one having a large area such as a switchboard, the bolt body 62 or the nut body 63 arranged on the opposite surface side of the wall 42 may not be held by hand. In many cases, it was difficult for one person to perform the mounting operation of the bushing 61 alone.

  Further, when there are other mounting parts around the through-hole 43, the bolt body 62 and the nut body 63 cannot be held by hand or a tool cannot be used due to the obstacle. The assembly of the bolt body 62 and the nut body 63 may be difficult or impossible.

  Further, since the bushing 61 requires two members, that is, a bolt body 62 and a nut body 63, the parts cost is increased, and parts management such as storage is troublesome.

  Therefore, the present invention can be fixed to a wall hole corresponding to various types of wall thicknesses by one type, and can be easily and easily fixed by operation from one side of the wall surface or the back of the wall, and the parts cost is low. It is an object to provide a fixture for a wall hole.

  The fixture to the wall hole according to claim 1 is attached to a cylindrically formed main body through which a wiring member is inserted, and a through hole formed in the wall provided outside the main body. An attaching portion for inserting the engaging portion into the through hole and engaging with the peripheral edge of the wall back side, and an abutting portion contacting the peripheral edge of the wall surface of the through hole. I have. And the outside of the main body extends toward the insertion side with the insertion side into the through hole as the base end or the anti-insertion side as the base end, and passes through the through hole. An elastic piece that flexes inward and elastically returns to the outside of the main body after passing through the through-hole is provided, and the locking portion corresponds to a plurality of types of wall thickness on the free end side of the elastic piece. A plurality of steps are provided in stages.

  This fixing tool is intended for a bushing, a connector or the like into which a wiring material such as a cable is inserted. An elastic piece extending from the insertion side into the through hole to the non-insertion side or extending from the anti-insertion port side to the insertion port side is provided on the outside of the main body. It is provided on the distal end side that can be freely displaced on the end side, that is, the side opposite to the base end. For example, as described in claim 2, a plurality of the locking portions can be provided stepwise by forming the outer surface on the free end side of the elastic piece inclined toward the main body side in a sawtooth shape.

  Since the fixing member is provided with a plurality of engaging portions stepwise on the free end side of the elastic piece, when the elastic piece that has passed through the through hole of the wall is elastically restored to the outside side of the main body and expanded, The peripheral edge of the hole is locked with any of the locking portions. Thereby, it is possible to cope with various types of wall thicknesses with one type of fixture. Moreover, it can fix by simple operation which only inserts a fixing tool in a through-hole from any one side of a wall surface or a wall back.

  According to a second aspect of the present invention, the outer surface on the free end side of the elastic piece according to the first aspect is inclined toward the main body, and a plurality of locking portions are formed on the outer surface. As a result, when the elastic piece that has passed through the through hole is elastically restored and expanded, one of the locking portions provided on the outer surface of the elastic piece inclined toward the main body is locked to the periphery of the through hole. Then, it is held in the through hole by the elastic restoring force of the elastic piece.

  According to a third aspect of the present invention, in particular, the main body includes an outer peripheral wall that abuts along the inner wall surface of the through hole except at least a portion where the elastic piece is formed. That is, the outer diameter of the outer peripheral wall of the main body is formed to be approximately the same as the inner diameter of the through hole. The outer peripheral wall of the main body may reach the entire circumference excluding the portion where the elastic piece is formed and abut against the inner wall surface of the through hole. Of the entire circumference excluding the portion where the elastic piece is formed Any one of these may partially abut against the inner wall surface of the through hole.

  In particular, the fixture of claim 4 is provided with two or more elastic pieces. If three or more elastic pieces are provided, or a large number of elastic pieces are formed so as to reach almost the entire circumference of the outer peripheral wall, the elastic pieces are stably fixed to the through-holes. .

  In the fixing device according to the fifth aspect, in particular, the abutting portion of the attachment portion is provided with a resilient material or a resilient projection that abuts on the wall surface side periphery of the through hole. Here, the elastic material is separately attached to the abutting portion of the attaching portion, and may be attached to the abutting portion by means of sticking or the like in advance, or attached when fixing to the wall hole. It is good also as what clamps with the wall surface and peripheral part of the periphery of a through-hole. Further, the elastic projection is provided integrally with the contact portion of the attachment portion, and can be integrally formed as a small protrusion or an elastic piece on the contact surface of the contact portion in advance.

  As a result, when the peripheral edge of the through hole is engaged with any one of the plurality of engaging portions formed stepwise on the outer surface of the elastic piece of the fixing tool, the distance between the contact portion and the engaging portion of the fixing tool is increased. Even if the wall thickness is slightly larger than the wall thickness, the elastic material or the elastic protrusion absorbs the slight dimensional difference due to its elasticity, and it is engaged through these. Since it acts so that the peripheral part of a through-hole may be pinched by a stop part and an abutting part, shakiness after fixation is prevented. Moreover, the airtightness between the inside and outside of the wall is increased. Furthermore, it is possible to absorb vibrations in a portion where the fixing tool is fixed to the through hole of the wall.

  According to the first aspect of the present invention, since a plurality of locking portions are provided stepwise on the free end side of the elastic piece, one type of fixing tool can cope with various types of wall thicknesses. Moreover, it can fix to a through-hole by operation from any one side of a wall surface or a wall back. As a result, the fixture can be easily and easily fixed to the through-hole, and the component cost can be reduced, and the component management is facilitated.

  According to the second aspect of the present invention, since the plurality of locking portions are formed on the outer surface of the free end side of the elastic piece, the locking portion can be formed with a simple configuration using the outer surface of the wall elastic piece.

  In the invention of claim 3, since the main body has an outer peripheral wall that abuts along the inner wall surface of the through hole, it is restricted that the main body is rattling in the lateral direction perpendicular to the tube axis of the main body in the through hole, and is stable. It can be held in the through hole.

  In the invention of claim 4, since two or more elastic pieces are provided, it can be stably attached to the through hole.

  In the invention of claim 5, since the elastic material or the elastic protrusion is provided at the contact portion of the attachment portion, the engaging portion and the contact portion are connected to the periphery of the through hole via these members. It is possible to obtain a stable fixed state by pinching the portion.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. Here, FIG. 1 shows a fixture according to an embodiment of the present invention, wherein (a) is a front view, (b) is a right side view, and (c) is a rear view. In this embodiment, the thing using a bushing as a fixing tool is shown.

  In FIG. 1, a bushing 1 is attached to a through hole 43 formed in a wall 42 such as a wiring box 41 shown in FIGS. 7 and 8, and a cable C as a wiring material shown in FIGS. It is protected by being rubbed at the peripheral edge of the through-hole 43 when it is pulled in or pulled out through the hole 43, thereby preventing damage or disconnection.

  The bushing 1 is formed of a main body 2 formed in a short cylindrical shape and a mounting portion 3 provided outside the main body 2 and can be formed by integral molding of a synthetic resin material. The main body 2 is formed of a cylindrical outer peripheral wall 4 having a predetermined thickness, and a cable C is inserted therethrough. In the main body 2, an opening on one end side is an insertion opening 5 facing the through hole 43, and an opening on the other end side is a drawing opening 6 through which the cable C is drawn out and drawn. The end of the outer peripheral wall 4 on the side of the insertion opening 5 becomes an inclined surface 7 that is reduced in diameter toward the insertion opening 5, so that the outer peripheral wall 4 can be easily inserted into the through hole 43 of the wall 42. .

  An annular flange 8 is integrally provided on the drawer opening 6 side of the main body 2, the peripheral edge of the drawer opening 6 is formed in a curved surface 9 curved in a round shape, and the cable C is connected to the drawer opening 6. The cable C is prevented from being damaged at the peripheral edge of the drawer opening 6 when being pulled out from or into the drawer opening 6. The back surface side of the flange portion 8 is formed as a flat contact surface 8 a and constitutes the contact portion 10 that contacts the wall surface side peripheral edge 44 of the through hole 43.

  Further, the outer peripheral wall 4 of the main body 2 has a constant width from the peripheral edge of the insertion opening 5 which is the insertion side to the through hole 43 of the wall 42 toward the drawing opening 6 which is the anti-insertion side. The elastic piece 11 is extended. A pair of the elastic pieces 11 are provided so as to face each other. First, a first inclined portion 12 is formed which is inclined outward at an angle of about 40 degrees with respect to the surface of the outer peripheral wall 4 of the main body 2. Next, the elastic piece 11 is inverted at a bent portion 13 at a substantially intermediate position in the length direction of the main body 2 and bent in a square shape toward the inner side. A second inclined portion 14 that is inclined at an angle of about 30 degrees toward the inner side with respect to the surface of the outer peripheral wall 4 is formed on the distal end side from the bent portion 13. The tip of the second inclined portion 14 can be freely displaced inward and outward as a free end 15.

  When an external force is applied to the outer surface 16 inward, that is, toward the inner side of the main body 2, the elastic piece 11 is elastically bent inward generally around the base end, and the pressing by the external force is released. And return elastically outward. As shown in FIG. 1 (e), the outer dimension L between the pair of bent portions 13 farthest from the outer peripheral wall 4 is larger than the inner diameter of the through-hole 43 of the wall 42. Is inserted into the through-hole 43 and is pressed by the inner wall surface of the through-hole 43 to bend toward the inner side of the main body 2, the outer dimension of the pair of bent portions 13 is the through-hole 43. It is slightly smaller than the inner diameter of the through hole 43 and can pass through the through hole 43. After the bent portion 13 has passed through the through hole 43, the elastic piece 11 loses the pressing force by the inner wall surface of the through hole 43 and returns elastically to the outside of the main body.

  Further, the outer surface 16 of the second inclined portion 14 on the free end 15 side of the elastic piece 11 is formed in a plurality of sawtooth stepped portions, and a plurality of locking portions 17 are provided by these stepped portions. In the bushing 1 of this embodiment, three locking portions of a first locking portion 17a, a second locking portion 17b, and a third locking portion 17c are provided in order from the side close to the bent portion 13. Here, in the present embodiment, as shown in FIG. 1 (e), the engaging portion 17 has an opening angle i between the crests of the serrated step portion set to about 105 degrees. . If the opening angle i is too large, the unevenness of the stepped portion becomes shallow and gentle, and the locking is easily released. The opening angle i and shape of the locking portion 17 are preferably set to optimum values by a trial or the like.

  The outer peripheral wall 4 of the annular shape has an outer diameter that is substantially the same as the inner diameter of the through-hole 43 except for a portion and a place where the pair of elastic pieces 11 are formed. It abuts along the inner peripheral wall surface. The outer peripheral wall 4 may reach the entire circumference except for the portion where the elastic piece 11 is formed and abut against the inner wall surface of the through hole 43, and exclude the portion where the elastic piece 11 is formed. Any part of the entire circumference may partially abut against the inner wall surface of the through hole 43.

  Further, the outer peripheral wall 4 has a portion where the elastic piece 11 is provided and its periphery formed in a substantially flat surface, that is, two circular portions of the outer peripheral wall 4 are recessed in a string shape. A bending space 18 is formed between the flat surface and the free end 15 of the elastic piece 11 to allow the elastic piece 11 to bend toward the inside of the main body 2. This is because, in order for the elastic piece 11 to pass through the through-hole 43 and the locking portion 17 to be locked to the peripheral edge of the wall back side of the through-hole 43, there is a certain amount of bending allowance that is reciprocally displaced toward the inner side of the main body 2. This is because the bending allowance is ensured only outside the outer peripheral wall 4.

  In this regard, in order to ensure a certain amount of bending allowance, a notch groove or a notch hole is formed in the outer peripheral wall 4 in order for the free end 15 of the elastic piece 11 to enter the inner space of the circular outer peripheral wall 4. There is a way to do it. However, when the outer peripheral wall 4 is provided with a notch groove or a notch hole, when the cable C inserted into the main body 2 is inserted into or pulled back from the inner wall 2, the notch groove or the notch hole is rubbed and damaged. There is a risk of sticking. Therefore, in order to avoid this, the elastic piece 11 is bent only on the outer side of the outer peripheral wall 4 without forming the notch groove or the like in the outer peripheral wall 4.

  However, in order to prevent the cable C from being damaged, it is desirable to form a part of the outer peripheral wall 4 on a flat surface and secure a bending allowance only on the outer side of the outer peripheral wall 4, but the present invention is carried out. In this case, the present invention is not limited to this, and as described above, providing a notch groove or the like in the outer peripheral wall 4 does not prevent securing a certain amount of bending allowance.

Next, the fixing of the bushing 1 configured as described above to the through hole 43 will be described with reference to FIG.
First, when fixing to the through-hole 43 formed in the thick wall 42, the insertion opening 5 of the bushing 1 is opposed to the through-hole 43 from the front side of the wall, and enters the through-hole 43 as it is from the direction orthogonal to the surface of the wall 42. Insert straight. Then, as shown in FIG. 2A, the elastic piece 11 of the bushing 1 is pressed against the inner peripheral wall of the through hole 43 and elastically bends inward, and the bent portion 13 reaches the inner peripheral wall at the through hole 43. Then, the diameter is reduced inward by bending inward.

  When the bent portion 13 of the elastic piece 11 comes out of the through hole 43, the elastic piece 11 is elastically restored and moves outward while expanding outward, and eventually, as shown in FIG. 2 (b). The first locking part 17 a formed at the position closest to the bent part 13 on the outer surface 16 is locked to the wall back side peripheral edge 45 of the through hole 43. In this state, the distance between the first locking portion 17a and the contact surface 8a of the flange portion 8 is substantially equal to the wall thickness, so that the contact surface 8a of the flange portion 8 contacts the wall surface of the wall 42. Further movement to the inner side is prevented, and the first locking portion 17a is kept locked. At this time, the elastic piece 11 strongly presses the inner wall surface of the through-hole 43 outwardly by the pair of first locking portions 17a by the elastic restoring force, and the bushing 1 is pressed against the through-hole 43 by the pressing force. Retained and fixed.

  Next, when fixing to the through-hole 43 formed in the thin wall 42, the bushing 1 is similarly inserted straightly into the through-hole 43 from the direction perpendicular to the surface of the wall 42 from the wall front side. 2A, the elastic piece 11 of the bushing 1 is pressed against the inner peripheral wall of the through hole 43 and elastically bent toward the inner side, and the bent portion 13 is formed on the inner peripheral wall of the through hole 43. When it reaches the abutting position, it bends inward at the maximum. When the bent portion 13 exits the through hole 43, the elastic piece 11 moves into the wall while being expanded outward by the elastic restoring force. First, the first locking portion 17a is first moved to the wall of the through hole 43. The back side peripheral edge 45 is locked. However, in this state, since the distance between the first locking portion 17a and the contact surface 8a of the flange portion 8 is larger than the wall thickness, the bushing 1 is in a state where it can move further to the inside.

  Therefore, when the bushing 1 is further pushed in, the serrated stepped portion of the first locking portion 17a moves over the peripheral edge on the back side of the through hole 43, and the next second locking portion 17b passes through the through hole. The hole 43 is engaged with the wall back side periphery.

  At the stage where the second locking portion 17b is locked, the distance between the second locking portion 17b and the contact surface 8a of the flange portion 8 is still larger than the wall thickness. It is possible to move. Therefore, when the bushing 1 is further pushed in, the serrated stepped portion of the second locking portion 17b moves over the peripheral edge of the through hole 43 and moves upward, as shown in FIG. 2 (c). The three locking portions 17c are locked to the peripheral edge of the through hole 43 on the wall back side.

  When this state is reached, the distance between the third locking portion 17c and the contact surface 8a of the flange portion 8 and the wall thickness are substantially equal, so that the contact surface 8a of the flange portion 8 is in contact with the wall surface of the wall 42. The contact is prevented from further moving to the inner side, and the third locking portion 17c is kept locked. As a result, the elastic piece 11 strongly presses the inner wall surface of the through-hole 43 outwardly by the pair of third locking portions 17c due to its elastic restoring force, and the bushing 1 is pressed against the through-hole 43 by the pressing force. Retained and fixed.

  Next, when the wall thickness is about the middle of them, the illustration is omitted, but the bushing 1 is in an intermediate state between (b) and (c) of FIG. The locking portion 17b is fixed in a state of being locked to the peripheral edge of the through hole 43 on the wall back side.

  Here, in the state where the bushing 1 is fixed to the through hole 43 in this way, the outer peripheral wall 4 of the main body 2 abuts along the inner wall surface of the through hole 43, so the bushing 1 is connected to the inner wall surface of the through hole 43. On the other hand, rattling in the lateral direction perpendicular to the tube axis of the main body 2 is restricted and held in the through hole 43 in a stable state.

Next, the operation of the bushing 1 of the present embodiment configured as described above will be described.
The bushing 1 is provided with a first locking portion 17a, a second locking portion 17b, and a third locking portion 17c in a stepwise manner on the free end 15 side of the elastic piece 11, and the first bushing 1 is provided when the wall thickness is large. When the wall thickness is intermediate, it is locked with the second locking portion 17b, and when the wall thickness is small, the locking portion 17a is locked with the third locking portion 17c. Stop and hold. For this reason, it can fix to the through-hole 43 by one type corresponding to different wall thickness.

  In addition, since the elastic piece 11 is provided on the main body 2 and the locking portion 17 is provided on the outer surface 16 thereof, it can be fixed by simply inserting the bushing 1 from the wall surface side toward the through hole 43. As a result, the bushing 1 can be fixed to the through hole 43 easily and easily.

  And since the outer surface 16 on the free end 15 side of the elastic piece 11 is inclined to the main body 2 side and the three locking portions 17 are formed on the outer surface 16, the outer surface 16 of the elastic piece 11 is used. The locking portion 17 can be formed with a simple configuration.

  By the way, in the said embodiment, as shown in FIG. 3, the elastic material 19 which consists of elastic members, such as sponge rubber and a foam sheet, is stuck on the contact surface 8a of the collar part 8 of the bushing 1. As shown in FIG. May be. By providing this, when the peripheral edge of the through-hole 43 is locked with any of the plurality of locking portions 17 of the elastic piece 11, the distance between the contact surface 8 a of the flange 8 and the locking portion 17 is temporarily assumed. Even if slight wobbling occurs in the tube axis direction due to being slightly larger than the wall thickness, the slight dimensional difference is absorbed by the elasticity of the elastic material 19. As a result, the peripheral edge portion of the through hole 43 is pinched by the engaging portion 17 and the contact surface 8a of the flange portion 8 through the elastic material 19, and the bushing 1 is stably formed in the through hole 43 without rattling. Can be fixed.

  Further, in place of the elastic material 19, as shown in FIG. 4 (a), an elastic projection consisting of a small hemispherical protrusion protruding slightly toward the bending space 18 on the contact surface 8a of the flange portion 8. 20 may be integrally projected. Alternatively, as shown in FIG. 4 (b), a resilient projection 21 made of an elastic piece projecting toward the bending space 18 may be integrally provided on the contact surface 8a of the flange portion 8. Even when these are provided, the peripheral portion of the through-hole 43 is caused to engage with the locking portion 17 via the elastic protrusion 20 or the elastic protrusion 21 by the elastic force as in the case where the elastic material 19 is adhered. Therefore, the bushing 1 is stably fixed to the through-hole 43.

  Next, in the above-described embodiment, the elastic piece 11 extends from the outer peripheral wall 4 of the main body 2 toward the drawer opening 6 side that is the anti-insertion side with the peripheral edge of the insertion opening 5 as a base end. On the contrary, as shown in FIG. 5 (a), an elastic piece 22 is erected on the contact surface 8a of the flange 8 on the drawer opening 6 side, and extends to the insertion opening 5 side at the base end. It can also be done. That is, the elastic piece 22 is inverted at the first inclined portion 23 inclined obliquely outward and the bent portion 24 at a substantially intermediate position with the contact surface 8a of the flange portion 8 as a base end. It is formed with the second inclined portion 25 bent in a square shape. The distal end of the second inclined portion 25 is a free end 26 that can be freely displaced inward and outward.

  The outer surface 27 of the second inclined portion 25 on the free end 26 side of the elastic piece 22 is formed in a plurality of serrated steps, and the first locking portion 28a is formed on the outer surface 27 in order from the side close to the bent portion 24. The three locking portions 28, the second locking portion 28b and the third locking portion 28c, are provided.

  When an external force is applied to the outer surface 27 of the elastic piece 22 toward the inner side of the main body 2, the inner side of the main body 2, that is, the outer peripheral wall 4 side as a whole, with the base end of the abutting surface 8 a of the flange 8 as an axis. When the pressure due to the external force is released, the elastic return is made to the outside. The bent portion 24 is maximally bent inward when passing through the through hole 43, and returns to the outside of the main body 2 after passing.

  When the bushing 1 provided with the elastic piece 22 is inserted into the through hole 43, the second inclined portion 25 of the elastic piece 22 is inclined toward the inner side, so that it can be smoothly inserted into the through hole 43. it can. When the bushing 1 is inserted into the through-hole 43, the bent portion 24 bends and shrinks inward as shown in FIG. When the insertion is further continued and the bent portion 24 leaves the through-hole 43, the elastic piece 22 moves while returning elastically to the outside, and the wall back side periphery of the through-hole 43 corresponds to the wall thickness. It latches with the latching | locking part 28, and is hold | maintained and fixed to the state shown in FIG.5 (c).

  The bushing 1 provided with the elastic piece 22 can be fixed to the through-hole 43 corresponding to various types of wall thicknesses in the same manner as the embodiment provided with the elastic piece 11, It can be easily fixed by a simple operation of simply inserting from the front side toward the through hole 43.

  In addition, in the bushing 1 of this embodiment, in particular, since the elastic piece 22 bends laterally around the base end of the abutting surface 8a of the collar portion 8, from the base end that is the shaft to the locking portion 28. 5 is shorter than the bushing 1 in which the elastic piece 11 is formed. However, the locking portion 28 has the peripheral edge 45 on the wall back side of the through hole 43 as indicated by the arrow in FIG. Press slightly diagonally downward. That is, in the bushing 1 provided with the elastic piece 11, the elastic piece 11 bends with the base end of the peripheral edge of the insertion opening 5 as an axis, and the locking portion 17 faces the inner wall surface of the through hole 43 sideways. On the other hand, in the bushing 1 provided with the elastic piece 22 of this embodiment, the locking portion 28 presses the inner wall surface of the through hole 43 sideways, and the lower side, that is, the contact surface of the flange portion 8. Press to the 8a side to some extent. As a result, the wall 42 is directly pressed against the contact surface 8a of the flange 8, so that the bushing 1 is prevented from rattling in the tube axis direction, and is stably held and fixed in the through hole 43.

Next, as another example, a connector that is fixed to a wall hole and into which a wiring member is inserted is a connector.
In FIG. 6, the connector 31 is fixed to a through hole 43 formed in the wall 42 of the wiring box 41, and a protective tube that houses and protects the wiring material is connected to one end. The connector 31 shown in FIG. 6 is connected with a round pipe-like corrugated pipe as a protective pipe.

  The connector 31 is formed of a main body 32 formed in a cylindrical shape and a mounting portion 33 provided outside the main body 32, and can be formed of a synthetic resin material. The main body 32 is formed of a cylindrical outer peripheral wall 32a, and a wiring cable is inserted into the main body 32. In the main body 32, an opening on one end side forms an insertion opening 34 facing the through hole 43, and an opening on the other end side forms a connection opening 35 to which a round pipe-like corrugated pipe (not shown) is connected. ing.

  Furthermore, an annular flange 36 is integrally provided at a position near the insertion opening 34 in an intermediate portion of the outer peripheral wall 32a of the main body 32. The surface of the flange portion 36 on the side of the insertion opening 34 is formed as a flat contact surface, and constitutes a contact portion 37 that contacts the wall surface side peripheral edge 44 of the through hole 43.

  The end of the outer peripheral wall 32a on the side of the insertion opening 34 has an inclined surface whose diameter decreases toward the insertion opening 34, so that the outer peripheral wall 32a can be smoothly inserted into the through hole 43 of the wall 42. It has become. Further, on the inner peripheral wall of the main body 32 on the connection opening 35 side, a plurality of engagement claws 38 that are elastically bent outward and engage with the outer circumferential uneven surface of the corrugated pipe are annularly arranged. .

  The outer peripheral wall 32a of the main body 32 is provided with an elastic piece 39 extending from the peripheral edge of the insertion opening 34 toward the flange 36 on the side opposite to the insertion side and the connection opening 35 side. A pair of the elastic pieces 39 are provided opposite to each other, and has the same configuration as the elastic piece 11 of the bushing 1. The first engaging portion 40a and the second engagement are provided on the outer surface 39b on the free end 39a side. A locking portion 40 including a locking portion 40b and a third locking portion 40c is provided. In addition, the said elastic piece 39 is the structure similar to the elastic piece 11 of the said bushing 1, The description is abbreviate | omitted.

  That is, the connector 31 is different from the bushing 1 only in that the flange portion 8 of the bushing 1 is basically a corrugated tube connecting portion.

  Therefore, since the fixing part of the connector 31 to the through hole 43 has the same configuration as the bushing 1, it can be fixed to the through hole 43 in the same manner and has the same effects.

  By the way, although the elastic piece of each said embodiment is provided with a pair facing each other, it is not restricted to this, You may provide in three or more places at equal intervals or unequal intervals in the circumferential direction, and it is radial. It is also possible to provide a plurality of slits over the entire circumference, for example, by forming slits.

  The plurality of locking portions in each of the above embodiments are formed by providing stepped portions in a sawtooth shape, and are provided on the first inclined portion or the second inclined portion of the elastic piece. It is not limited to inclined surfaces. Furthermore, although the plurality of locking portions are formed in three steps in a single elastic piece corresponding to the wall thickness, two or four or more locking portions may be formed.

  In addition, although the main body of each of the above embodiments is formed in a cylindrical shape, it may be formed in a rectangular tube shape such as a square tube shape or a hexagonal tube shape.

  Furthermore, the outer peripheral wall of the main body is configured to abut along the inner wall surface of the through hole except for a portion where the elastic piece is formed, but is not limited thereto.

  And although the fixture of this invention has shown what is fixed to the through-hole 43 formed in the wall 42 of the wiring box 41, an outlet box, a pool box, a switchboard, a distribution board, an end cover, etc. are shown to others. Further, the present invention can be widely applied to a through-hole formed in the above, a through-hole formed in an outer wall, a partition wall, a ceiling wall, or the like of a building through which a cable is inserted.

The bushing of one Embodiment of this invention is shown, (a) is a front view, (b) is a right view, (c) is a rear view, (d) is a perspective view, (e) is an A- Sectional drawing by A cut line, (f) is sectional drawing by the BB cutting line of (a). It is sectional drawing which shows the state which fixes the bushing of FIG. 1 to the through-hole of a wall, (a) shows the state in the middle of insertion in a through-hole, (b) is the state fixed to the through-hole of large wall thickness, (c) shows the state fixed to the through-hole of small wall thickness. It is sectional drawing which shows the modification of the bushing of FIG. FIG. 5 is a cross-sectional view showing another modification of the bushing of FIG. 1, in which (a) shows a resilient projection made of a small projection, and (b) shows a resilient projection made of an elastic piece. FIG. 4 is a cross-sectional view of another bushing according to the embodiment of the present invention, where (a) shows a state before being inserted into the through hole of the wall, (b) is a state during insertion into the through hole, and (c) is a through hole. The state fixed to the hole is shown. 1 shows a connector according to an embodiment of the present invention, in which (a) is a plan view, (b) is a front view, (c) is a right side view, (d) is a bottom view, and (e) is a perspective view. A conventional bushing is shown, (a) is a perspective view and (b) is a plan view. It is a perspective view which shows another conventional bushing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bushing 2,32 Main body 3,33 Attachment part 4,32a Peripheral wall 5,34 Insertion opening 6 Drawer opening 7 Inclined surface 8,36 Gutter part 8a Contact surface 10,37 Contact part 11,22,39 Elastic piece 15, 26 Free end 16, 27 Outer surface 17, 28, 40 Locking part 17a, 28a, 40a First locking part 17b, 28b, 40b Second locking part 17c, 28c, 40c Third locking part 19 Material 20, 21 Ejection protrusion 31 Connector 41 Wiring box 42 Wall 43 Through-hole 44 Wall surface side periphery 45 Wall back side periphery C Cable

Claims (5)

A main body formed in a cylindrical shape into which a wiring material is inserted, and
An attachment portion for attaching to a through-hole formed in the wall, provided outside the main body,
The attachment portion includes a locking portion that is inserted into the through hole and locks to the wall back side periphery, and a contact portion that contacts the wall front side periphery of the through hole,
Outside the main body, the insertion side into the through hole extends toward the insertion side with the base end as the base end or the anti-insertion side as the base end, and the inner side of the main body passes through the through hole. An elastic piece that elastically returns to the outside of the main body after passing through the through-hole while being bent
A fixing tool for a wall hole, wherein a plurality of the locking portions are provided stepwise on the free end side of the elastic piece so as to correspond to a plurality of types of wall thicknesses.   2. The fixture for a wall hole according to claim 1, wherein an outer surface of the elastic piece is inclined toward the main body, and the plurality of locking portions are formed on the outer surface. 3.   3. The wall hole according to claim 1, wherein the main body includes an outer peripheral wall that abuts along an inner wall surface of the through-hole except at least a portion where the elastic piece is formed. Fixer to.   The fixture for a wall hole according to any one of claims 1 to 3, wherein two or more elastic pieces are provided.   The wall according to any one of claims 1 to 4, wherein the contact portion of the attachment portion is provided with a resilient material or a resilient projection that abuts against a wall front side peripheral edge of the through hole. Fixture to the hole.

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