JP2018007340A - Cable gland - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable gland attached to a wall body and having a structure in which a screw element is not exposed on a front side of the wall body and a structure in which a protrusion amount of the wall body toward the front side can be made smaller.SOLUTION: A cable gland has a structure that, in the state where a cylindrical part 22 of a ground body 2 is inserted into a mounting hole 101 of a wall body 100 from a wall body front side, the ground body 2 is mounted to the wall body 100 by screwing a locknut 6 onto the cylindrical part 22 protruding on the wall body rear side, and then in the state where a sleeve 3 is fitted into an insertion hole 23 of the ground body 2, a plug 4 is screwed into a female screw 23a of the insertion hole 23 from a wall body rear side, the plug 4 being a screw element of the cable gland 1 can be arranged on the rear side of the wall body. This can prevent a mischief of loosening the plug 4. Furthermore, a protrusion amount of the wall body 100 toward the front side can be made smaller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cable gland for holding a cable.

  A technique for holding a cable via a cable gland attached to a casing or the like of the electric device when connecting the cable to the electric device is known (for example, see Patent Document 1).

  As the cable gland, for example, a tubular member through which a cable can be inserted, a tubular gland body in which male threads are formed on both sides sandwiching the eaves part and the eaves part, and rubber made to be fitted in the gland body 1, a cap (cap nut) that is screwed into a male screw on one side of the gland main body (side on which the sleeve is fitted), a lock nut that fixes the gland main body to the wall body, and the like.

  In such a cable gland, the male screw on the other side of the gland body is inserted from the front side of the wall body into a mounting hole formed in the wall body of an electrical equipment casing or the like, and the lock nut is connected to the male screw on the other side. The ground body is attached to the wall body by screwing in from the back side of the wall body. After that, with the cable inserted through the sleeve and the cap, the sleeve is fitted into the ground body, and the cap is screwed into the male screw on one side of the ground body (the male screw protruding to the front side of the wall body) from the front side of the wall body. Tighten. By tightening the sleeve with the cap in this manner, the sleeve is deformed in the diameter reducing direction, and the inner peripheral surface of the insertion hole of the sleeve and the outer peripheral surface of the cable are in close contact with each other. Accordingly, it is possible to prevent water, oil, dust, dust and the like from entering the housing of the electric device, and it is possible to firmly hold and fix the cable itself.

  In the cable gland, the flange portion of the gland main body is formed in, for example, a substantially hexagonal shape, and a tool such as a spanner can be applied.

JP 2007-37364 A

  By the way, the cable gland has a structure in which a cap for fastening the sleeve to the gland body is exposed on the front side (outside) of the wall body. For this reason, there exists a possibility that a cap may be loosened by mischief. In addition, since a part of the gland body and the cap protrude from the wall body to the front side, the cable gland may be damaged when a weight is put on the projecting part with a foot.

  The present invention has been made in consideration of such circumstances, and in a cable gland attached to a wall body, a screw element is not exposed on the front side of the wall body, and the amount of protrusion to the front side of the wall body is reduced. The object is to provide a possible structure.

  The present invention provides a cable gland attached to a wall body, comprising a cylindrical member having a circular outer periphery and a cylindrical member having an insertion hole through which a cable passes, and the flange is provided at one end of the cylindrical portion. A ground body formed integrally with an external thread on the outer peripheral surface of the cylindrical portion, and an internal thread formed on the inner peripheral surface of the insertion hole from the other end of the cylindrical portion to the flange side; and A sleeve having an insertion hole for passing a cable, and a sleeve fitted into the insertion hole of the ground body from the other end side of the cylindrical portion; a cylindrical member capable of inserting the cable; and an internal thread of the insertion hole of the ground body And a lock nut formed with a female screw that meshes with the male screw of the cylindrical portion.

  And the cylinder part which protrudes on the back side of the wall body in the state which inserted the cylindrical part of the ground body into the attachment hole formed in the wall body from the front side of the wall body, and has arranged the collar part on the front side of the wall body The ground body is attached to the wall body by screwing the lock nut into the part, and the sleeve is fitted into the insertion hole of the ground body from the other end side of the cylindrical part, and the female screw of the insertion hole is The plug is screwed from the back side of the wall. Further, a rotation-preventing groove is formed in the cylindrical portion of the ground main body, and a washer is fitted into the cylindrical portion of the ground main body and disposed between the lock nut and the wall body. In the state where the ground body is attached to the wall body, the first tongue piece that fits into the rotation stop groove of the cylindrical portion and the second tongue that fits into the notch formed at the peripheral edge of the mounting hole of the wall body. A tongue piece is formed.

  According to the cable gland of the present invention, with the cylindrical portion of the ground body inserted into the mounting hole of the wall body from the front side of the wall body, the lock body is screwed into the cylindrical portion protruding to the back side of the wall body, thereby Is attached to the wall body, and then the plug is screwed into the female screw of the insertion hole from the back side of the wall body with the sleeve fitted in the insertion hole of the ground body.

  With such a structure, the lock nut and plug, which are screw elements of the cable gland, can be arranged on the back side of the wall body, and the member exposed on the front side of the wall body has a circular outer periphery that is difficult to perform a rotation operation. (Including packing) only. As a result, it is possible to prevent mischief such as loosening the plug for tightening the sleeve and the ground body. Furthermore, since the amount of protrusion of the circular outer periphery exposed on the front side of the wall body can be reduced to the outside of the wall body, it is possible to have a structure in which it is difficult to put a foot on the wall portion.

  Here, in the cable gland according to the present invention, since the gland main body is constituted by the flange portion and the cylindrical portion having a circular outer periphery, it is difficult to fix the rotation of the gland main body with a tool such as a spanner. For this reason, there is a possibility that the ground body rotates when the sleeve is tightened by screwing the plug after the ground body is attached to the wall body with the lock nut.

  In order to eliminate such a point, in the cable gland according to the present invention, a washer is provided that is fitted into the cylindrical portion of the gland main body and is disposed between the wall body and the lock nut. Two tongue pieces are provided. And with the ground body attached to the wall body, the first tongue piece of the washer is fitted into the rotation stop groove of the ground body, and the second tongue piece of the washer is fitted into the notch of the wall body. ing. With such a structure, even if the ground body tries to rotate, the first tongue piece is locked in the rotation stop groove of the ground body, and the second tongue piece is locked in the notch of the wall body. Rotation is regulated. As a result, the ground body does not rotate when the plug is screwed into the cylindrical portion of the ground body (when the sleeve is tightened) after the ground body is attached to the wall.

  According to the cable gland of the present invention, since the screw element is structured not to be exposed on the front side of the wall body, it is possible to prevent mischief such as loosening a member for fastening the gland main body or the sleeve. Furthermore, since only the circular outer peripheral collar portion (including packing) protrudes on the front side of the wall body, a structure in which it is difficult to put a foot can be obtained.

It is a longitudinal cross-sectional view which shows an example of the cable gland of this invention. It is a horizontal sectional view showing an example of the cable gland of the present invention. It is a disassembled perspective view of the cable gland of FIG.1 and FIG.2. 4A is a front view of a washer used for the cable gland of FIGS. 1 to 3, and FIG. 4B is a longitudinal sectional view of the washer.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are a longitudinal sectional view and a horizontal sectional view, respectively, showing an example of the cable gland 1 of the present invention, and FIG. 3 is an exploded perspective view of the cable gland 1. 4A is a front view of the washer 7 used for the cable gland, and FIG. 4B is a longitudinal sectional view of the washer 7.

  The cable gland 1 of the present embodiment is attached to a portion of the wall body 100 (for example, a wall body of a casing of an electric device or a wall body of a building) that penetrates the cable C. The cable gland 1 includes a gland main body 2, a sleeve 3, a plug 4, a packing 5, a lock nut 6, a washer 7, and the like.

  The ground body 2 is a cylindrical member (for example, made of resin), and includes a thin disk-shaped (annular) flange portion 21 and a cylindrical portion 22 having a circular outer periphery, and one end of the cylindrical portion 22 (see FIG. 1 and an end portion in the X1 direction in FIG. An insertion hole (through hole) 23 through which the cable C passes is formed in the ground body 2 along the axial direction. A sleeve 3 to be described later is fitted into the insertion hole 23 from the other end side of the cylindrical portion 22 (the end portion side in the X2 direction in FIGS. 1 and 2).

  On the outer peripheral surface of the cylindrical portion 22 of the ground main body 2, one end side (end portion 21 side: X1 direction in FIGS. 1 and 2) from the other end (end portion in the X2 direction in FIGS. 1 and 2) of the cylindrical portion 22. ) Is formed. The insertion hole 23 of the ground body 2 is formed with a female screw 23a that advances from the other end of the cylindrical portion 22 toward one end side. Further, the insertion hole 23 is formed with a conical taper surface 23 b for regulating the position of the end portion (end portion on the small diameter side) of the sleeve 3.

  Further, a single rotation stop groove 22 b extending along the axial direction is formed on the outer peripheral surface of the cylindrical portion 22 of the ground body 2. The depth of the rotation stop groove 22b is larger than the height of the thread of the male screw 22a. Moreover, the width | variety of the rotation stop groove | channel 22b is a magnitude | size which can fit the 1st tongue piece 71 of the washer 7 mentioned later.

  The sleeve 3 is a cylindrical body (for example, made of rubber) in which a conical tapered surface 3a is formed on the outer peripheral surface, and an insertion hole (through hole) 31 through which the cable C passes is formed along the axial direction. The length of the sleeve 3 in the axial direction is such that the sleeve 3 is fitted in the insertion hole 23 of the ground body 2 (the end of the small diameter side of the sleeve 3 is in contact with the conical taper surface 23b). The large-diameter side end has a length located inside the other end of the ground body 2 (the other end of the cylindrical portion 22).

  The plug 4 is a cylindrical member (for example, made of resin) having an insertion hole (through hole) 41 through which the cable C passes, and the outer peripheral surface is formed in a substantially hexagonal shape, and a tool such as a spanner can be applied. it can. On the outer peripheral surface of one end of the plug 4, a male screw 4 a that can be engaged with the female screw 23 a of the insertion hole 23 of the ground body 2 is formed.

  The packing 5 is an annular member (for example, made of rubber) having a circular hole 5a, and is sandwiched between the flange portion 21 of the ground body 2 and the wall body 100 (see FIGS. 1 and 2). The inner diameter of the packing 5 (the diameter of the circular hole 5a) is substantially equal to the outer diameter of the male screw 22a of the cylindrical portion 22 of the gland body 2.

  The lock nut 6 is a nut (for example, made of resin) for fixing the gland body 2 to the wall body 100, and has an outer peripheral surface formed in a substantially hexagonal shape, and a tool such as a spanner can be hung on it. A female screw 6 a that meshes with the male screw 22 a of the cylindrical portion 22 of the ground body 2 is formed.

  The washer 7 is an annular member (for example, made of sheet metal) having a circular hole 7 a and is used to stop the ground body 2. The inner diameter of the washer 7 (diameter of the circular hole 7a) is larger than the outer diameter of the male screw 22a of the cylindrical portion 22 of the ground body 2 by a predetermined amount. A first tongue piece 71 and two second tongue pieces 72 and 72 are provided on the periphery of the circular hole 7 a of the washer 7.

  These two second tongue pieces 72, 72 are arranged at positions that are 180 ° rotationally symmetric with respect to the center of the circular hole 7a (positions that are on a straight line passing through the center of the circular hole 7a). Further, the two second tongue pieces 72 and 72 are arranged at positions rotated by 90 ° with respect to the first tongue piece 71, respectively. That is, the two second tongue pieces 72, 72 are arranged on a straight line (straight line passing through the center of the circular hole 7a) orthogonal to a straight line passing through the center of the first tongue piece 71 (straight line passing through the center of the circular hole 7a). Has been.

  The first tongue piece 71 and the two second tongue pieces 72, 72 protrude from the washer 7 in one direction. The first tongue piece 71 is located radially inward of the circumference along the periphery of the circular hole 7a (see FIG. 4), and in a mounted state shown in FIG. It is possible to fit into the stop groove 22b. The two second tongue pieces 72, 72 are arranged at positions corresponding to the circumference along the circumference of the circular hole 7a (see FIG. 4), and are attached to the wall body 100 described later in the attached state shown in FIG. It is possible to fit into the formed notches 102 and 102, respectively.

  The wall body 100 to which the cable gland 1 is attached is formed with a circular attachment hole 101 as shown in FIGS. The diameter of the mounting hole 101 is larger by a predetermined amount than the outer diameter of the male screw 22a of the cylindrical portion 22 of the ground body 2 (for example, the diameter of the mounting hole 101 and the diameter of the circular hole 7a of the washer 7 are substantially equal).

  Two notches 102 and 102 are formed on the periphery of the mounting hole 101. These two notches 102, 102 are positioned on a horizontal line passing through the center of the mounting hole 101, and are positioned 180 ° rotationally symmetric with respect to the center of the mounting hole 101 (two second tongues of the washer 7 72, a position corresponding to 72).

  Next, a procedure for attaching the cable gland 1 having the above structure will be described.

  (S1) First, the sleeve 3 and the plug 4 are disassembled from the ground body 2.

  (S2) The packing 5 is fitted into the cylindrical portion 22 of the ground body 2, and the cylindrical portion 22 is inserted into the mounting hole 101 of the wall body 100 from the outside of the wall body 100. At the time of this insertion, the rotation stop groove 22b of the cylindrical portion 22 is set to a state directly above. Further, the packing 5 is sandwiched between the flange portion 21 of the ground body 2 and the wall body 100.

  (S3) The washer 7 is attached to the cylindrical portion 22 of the ground main body 2 inserted into the mounting hole 101 of the wall body 100 (the portion protruding to the back side of the wall body 100), and the first tongue piece 71 and the second tongue piece 72 thereof. , 72 are fitted from the back side (inside) of the wall body 100 with the wall body 100 side (X2 direction in FIGS. 1 and 2) facing. At this time, the first tongue piece 71 of the washer 7 is fitted into the rotation stop groove 22b of the cylindrical portion 22, and the two second tongue pieces 72 and 72 are fitted into the notches 102 and 102 of the attachment hole 101, respectively.

  In this state, by screwing the lock nut 6 from the back side of the wall body 100 into the male screw 22a of the cylindrical portion 22 of the ground body 2 (the male screw 22a protruding from the back side of the wall body 100), the ground body 2 is attached to the wall. Attach (fix) to body 100. In this attached state, the washer 7 is sandwiched between the wall body 100 and the lock nut 6, the first tongue piece 71 of the washer 7 is fitted into the rotation stop groove 22 b of the ground body 2, and the two second tongues The pieces 72 and 72 are fitted into the notches 102 and 102 of the wall body 100, respectively. Thereby, rotation with respect to the wall body 100 of the ground main body 2 is controlled.

  (S4) After the mounting of the ground body 2 to the wall body 100 is completed, the sleeve 3 is inserted into the insertion hole 23 of the ground body 2 in the state where the cable C is passed through the sleeve 3 and the plug 4. (The other end side of the cylindrical portion 22), and then the plug 4 is fitted to the ground body 2 by aligning the male screw 4a of the plug 4 with the female screw 23a of the insertion hole 23 of the ground body 2 by work from the back side of the wall body 100. Screw it in. In the process of screwing the plug 4, the end of the sleeve 3 (end on the large diameter side) is pressed by the end of the plug 4, and the sleeve 3 is deformed in the direction of diameter reduction. Then, the inner peripheral surface of the insertion hole 31 of the sleeve 3 and the outer peripheral surface of the cable C are brought into close contact with each other in a state where the screwing (tightening) of the plug 4 is completed. As a result, it is possible to prevent the intrusion of water, oil, dust, dust, etc. into the inside of the wall body 100 (inside the casing, indoors, etc.) and hold the cable itself firmly.・ Can be fixed.

<Effect>
According to the cable gland 1 of the present embodiment, as shown in FIGS. 1 and 2, the lock nut 6 and the plug 4 which are screw elements of the cable gland 1 are provided on the back side of the wall body 100 (inside the casing or indoors). The members that can be disposed and are exposed to the front side of the wall body 100 can be only the flange portion 21 and the packing 5 having a circular outer periphery that is difficult to perform the rotation operation. As a result, it is possible to prevent mischief such as loosening the plug 4 and the ground body 2 for tightening the sleeve 3. As described above, since the ground body 2 and the like are not loosened due to mischief, the surface pressure of the packing 5 (the surface pressure at which the flange portion 21 of the ground body 2 presses the packing 5) is reduced, which may cause water leakage or the like. It becomes possible to ensure the airtightness and liquid tightness of the cable gland 1.

  In addition, the circular outer peripheral flange 21 exposed on the front side of the wall body 100 can reduce the amount of protrusion of the wall body 100 to the front side. Thereby, since it becomes difficult to put a foot on the buttocks 21, it is possible to prevent the cable gland 1 from being damaged due to weight.

  Further, the cable gland 1 of the present embodiment includes a washer 7 that is fitted into the cylindrical portion 22 of the gland main body 2 and disposed between the wall body 100 and the lock nut 6. A tongue piece 71 and second tongue pieces 72 and 72 are provided. Then, with the ground body 2 attached to the wall body 100, the first tongue piece 71 of the washer 7 is fitted into the rotation stop groove 22b of the ground body 2, and the second tongue pieces 72, 72 of the washer 7 are respectively fitted to the wall. Since the structure fits into the notches 102 and 102 of the body 100, even if the ground body 2 tries to rotate, the first tongue piece 71 is locked in the rotation stop groove 22b, and the second tongue pieces 72 and 72 are notched. The rotation of the ground main body 2 is restricted by engaging with 102 and 102.

  Thereby, after attaching the gland body 2 to the wall body 100, the gland body 2 does not rotate when the plug 4 is screwed into the cylindrical portion 22 of the gland body 2 (when the sleeve 3 is tightened).

-Other embodiments-
In addition, embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, the technical scope of the present invention includes all modifications within the scope and meaning equivalent to the scope of the claims.

  For example, in the above embodiment, the number of the first tongue pieces 71 of the washer 7 is one, and the number of the second tongue pieces 72 is two. In accordance with this, the number of the rotation stopping grooves 22b of the ground body 2 is one, and the number of the notches 102 of the mounting hole 101 of the wall body 100 is two, but the present invention is not limited to this, The number of the first tongue pieces of the washer 7 may be plural, and the number of the second tongue pieces may be one or three or more. In this case, what is necessary is just to determine the number and position of the notch to form in the attachment hole 101, and the number of the rotation stop grooves formed in the gland body 2 according to each number of these 1st tongue pieces and 2nd tongue pieces.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for a cable gland used when holding a cable on a wall body such as an electric device or a building.

DESCRIPTION OF SYMBOLS 1 Cable gland 2 Gland | gear main body 21 Girder part 22 Cylindrical part 22a Male thread 22b Stopping groove 23 Insertion hole 23a Female thread 23b Conical taper surface 3 Sleeve 3a Conical taper surface 31 Insertion hole 4 Plug 4a Male screw 41 Insertion hole 5 Packing 5a Circular hole 6 Nut 6a Female thread 7 Washer 7a Circular hole 71 First tongue piece 72 Second tongue piece 100 Wall body 101 Mounting hole 102 Notch

Claims (1)

In the cable gland attached to the wall,
A cylindrical member having an insertion hole through which a cable passes, and having a flange portion and a cylindrical portion having a circular outer periphery, the flange portion being integrally formed at one end of the cylindrical portion, and an outer peripheral surface of the cylindrical portion A gland body in which a male screw is formed on the inner peripheral surface of the insertion hole and is formed from the other end of the cylindrical portion to the flange portion side,
An insertion hole through which the cable passes, and a sleeve fitted from the other end side of the cylindrical portion into the insertion hole of the ground body;
A plug in which a male thread that engages with a female thread of the insertion hole of the ground body, which is a cylindrical member through which a cable can be inserted;
A lock nut formed with an internal thread that meshes with the external thread of the cylindrical portion, and
The cylindrical portion of the ground body is inserted into the mounting hole formed in the wall body from the front side of the wall body, and the flange portion is arranged on the front side of the wall body, and the cylindrical portion protruding to the back side of the wall body The ground body is attached to the wall body by screwing the lock nut,
In a state where the sleeve is fitted into the insertion hole of the ground body from the other end side of the cylindrical portion, the plug is screwed into the female screw of the insertion hole from the back side of the wall body,
A rotation stop groove is formed in the cylindrical portion of the ground body,
The washer is fitted into the cylindrical portion of the ground body, and includes a washer disposed between the lock nut and the wall body,
The washer is fitted into a first tongue piece that fits into the rotation-preventing groove of the cylindrical portion and a notch formed in the peripheral edge of the attachment hole of the wall body with the ground body attached to the wall body. A cable gland characterized in that a second tongue piece is formed.

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