JP2023068459A - Cable ground - Google Patents

Abstract

To provide a cable ground capable of holding a cable so as to be prevented from a rotation while suppressing an immersion of a foreign matter.SOLUTION: A cable ground 1 comprises: a ground main body 2; a cap 3; a sleeve 4; and a collet 5. An inner peripheral surface of the ground main body 2, a first taper surface to which the sleeve 4 is contacted is formed, and a groove part 26 for whirl-stopping the collet 5 is formed. A cap 3 includes: a peripheral wall part 31; a front wall part 32; and a second taper surface formed in an inner side corner part between the peripheral wall part 31 and the front wall part 32. The collet 5 includes a plurality of holding arms 521 in which a projection part 51b fitted with the groove part 26 is formed in a base part 51, and a chuck part 52 is extended to a shaft direction from the base part 51. The cable ground 1 holds the cable by suppressing an immersion of a foreign matter by pressing the sleeve 4 into the cable and the first taper surface with a pressure, and each holding arm 521 is deformed into an inner side of a radial direction by the second taper surface.SELECTED DRAWING: Figure 2

Description

The present invention relates to cable glands for holding cables.

2. Description of the Related Art A technology for holding a cable through a cable gland attached to a housing or the like of the electrical device when connecting the cable to the electrical device is known (see, for example, Patent Document 1).

A cable gland is a cylindrical member through which a cable can be inserted, and includes a flange, a gland body formed with male threads on both sides of the flange, a sleeve fitted into the gland body, and one side of the gland body ( It has a cap (cap nut) screwed into the male screw on the side where the sleeve is fitted, and a lock nut for fixing the gland body to the wall.

In such a cable gland, the male thread on the other side of the gland body is inserted into a mounting hole formed in the wall of the housing of the electrical equipment, and a lock nut is screwed into the male thread on the other side to tighten the gland body. to the wall. After that, the sleeve is fitted into the gland body with the cable inserted through the insertion hole of the sleeve, and the sleeve is tightened by screwing the cap onto the male thread on one side of the gland body. 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 brought into close contact. As a result, it is possible to prevent foreign matter (for example, water, oil, dust, dirt, etc.) from entering the housing of the electrical equipment, and to firmly hold and fix the cable itself.

JP 2007-37364 A

Here, in the above-described conventional cable gland, the sleeve prevents foreign matter from entering and holds the cable, but there is a possibility that the cable may rotate when torque is applied to the cable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cable gland capable of holding a cable so as not to rotate while suppressing the intrusion of foreign matter.

A cable gland according to the present invention is a cylindrical member through which a cable can be inserted, and has a cylindrical cable holding portion, a gland main body having a male thread formed on the outer peripheral surface of the cable holding portion; a cap formed with a female thread that engages with the male thread of the cable holding portion of the main body; a cylindrical sleeve that has an insertion hole for passing a cable through and is fitted to the cable holding portion of the gland main body; an annular base portion; and a collet that is fitted into the cable holding portion of the gland body. The inner peripheral surface of the gland body is formed with a first tapered surface with which the sleeve comes into contact, and is formed with a groove for preventing rotation of the collet. The cap includes a cylindrical peripheral wall portion formed with the female thread, a front wall portion integrally formed at one end of the peripheral wall portion, and an inner corner portion between the peripheral wall portion and the front wall portion. and a second tapered surface, and an opening through which a cable is passed is formed in the front wall portion. The collet has a plurality of holding arms in which protrusions to be fitted into the grooves are formed on the base portion, and the chuck portion extends axially from the base portion. With the sleeve and the collet fitted in the cable holding portion of the gland body, the cable gland is inserted between the cable and the first tapered surface by screwing the cap onto the male thread of the cable holding portion. The sleeve is press-fitted to suppress entry of foreign matter, and the holding arm is deformed radially inward by the second tapered surface to hold the cable.

By configuring in this way, the cable can be held by the collet so as not to rotate while the intrusion of foreign matter is suppressed by the sleeve.

In the cable gland described above, an outer protruding portion that protrudes radially outward and an inner protruding portion that protrudes radially inward may be formed at the tip of the holding arm.

In the above cable gland, a groove-shaped bypass passage extending in the axial direction may be formed on the outer peripheral surface of the cable holding portion.

According to the cable gland of the present invention, it is possible to hold the cable so as not to rotate while suppressing the intrusion of foreign matter.

1 is a perspective view showing a cable gland according to this embodiment; FIG. 2 is an exploded perspective view of the cable gland of FIG. 1; FIG. FIG. 3 is a view of the cable gland of FIG. 2 viewed from another angle; FIG. 2 is a cross-sectional view for explaining the cable gland of FIG. 1; FIG. 3 is a view of the gland main body of the cable gland of FIG. 2 as seen from the cap attachment side; FIG. 3 is a view of the collet of the cable gland of FIG. 2 from another angle; Fig. 3 is a view of the cap of the cable gland of Fig. 2 from another angle;

An embodiment of the present invention will be described below.

An example of the cable gland of the present invention will be described with reference to FIGS. 1 to 7. FIG.

The cable gland 1 includes a gland body 2, a cap 3, a sleeve 4, a collet 5, a lock nut 6, a washer 7, a packing 8, and the like, as shown in FIGS.

The gland body 2 is a substantially cylindrical member (made of resin, for example), and has a substantially hexagonal flange 21 formed in the center in the axial direction (the axial direction of the cylinder). A cylindrical cable holding portion 22 and a mounting portion 23 are formed on both sides (both sides in the axial direction).

A male thread 22 a is formed on the outer peripheral surface of the cable holding portion 22 . A male screw 23a is formed on the outer peripheral surface of the mounting portion 23. As shown in FIG. The mounting portion 23 is inserted into a mounting hole 101 formed in a wall 100 of a housing of the electric device (hereinafter also referred to as a wall 100 of the electric device).

In the following description, the cable holding part 22 side of the gland body 2 (the cap 3 side of the cable gland 1) is called the front side (X1 direction side), and the opposite side is called the rear side (X2 direction side).

An insertion hole (through hole) 24 for inserting a cable is formed in the ground body 2 along the axial direction. The insertion hole 24 is a stepped hole, and in the middle of the insertion hole 24 in the axial direction, there is a conical first tapered surface 25 for pressing the sleeve 4 (to be described later) inward (diameter-reducing direction). (see FIG. 4) are formed. The first tapered surface 25 is a tapered surface whose diameter decreases toward the rear side. A sleeve 4 and a collet 5, which will be described later, are fitted in the front side of the insertion hole 24. As shown in FIG.

A groove portion 26 for preventing rotation of the collet 5 with respect to the gland body 2 is formed on the inner peripheral surface of the insertion hole 24 . The groove portion 26 is formed to extend in the axial direction, and is formed to extend from the front end portion of the cable holding portion 22 until it reaches the first tapered surface 25 . A plurality of (for example, three) grooves 26 (see FIG. 5) are provided at predetermined intervals in the circumferential direction.

A groove-shaped bypass passage 27 (see FIG. 2) extending in the axial direction is formed on the outer peripheral surface of the cable holding portion 22 . The bypass passage 27 is formed to extend from the front end of the cable holding portion 22 until it reaches the collar portion 21 . As shown in FIG. 4, the bypass passage 27 is configured to allow the internal space formed by the cable C, the gland body 2, the cap 3 and the sleeve 4 to communicate with the outside. Moreover, this internal space communicates with the outside through a gap between an opening hole 32a of the cap 3 and the cable C, which will be described later. Therefore, when water pressure is applied to the internal space through the gap, the water pressure is released from the bypass passage 27 . That is, the bypass passage 27 is provided to release water pressure when water is injected from the front side of the cap 3 at high pressure. For example, one bypass passage 27 is provided.

A groove portion 28 (see FIG. 3) for preventing rotation of the washer 7 of the gland body 2 is formed on the outer peripheral surface of the mounting portion 23 . The groove portion 28 is formed to extend in the axial direction, and is formed to extend from the rear end portion of the mounting portion 23 until it reaches the flange portion 21 . For example, one groove 28 is provided.

The cap 3 is a cap nut-like member (made of resin, for example) having a tubular peripheral wall portion 31 with an approximately hexagonal outer peripheral surface and a front wall portion 32 covering the front side of the peripheral wall portion 31 . A female thread 31 a (see FIG. 7 ) that meshes with the male thread 22 a of the cable holding portion 22 of the gland body 2 is formed on the inner peripheral surface of the peripheral wall portion 31 of the cap 3 . A circular opening 32a for passing the cable C is formed in the center of the front wall portion 32 of the cap 3 . The inner diameter of the opening hole 32 a is smaller than the outer diameter of the sleeve 4 and the outer diameter of the collet 5 . The cap 3 also has a second tapered surface 33 formed at an inner corner between the peripheral wall portion 31 and the front wall portion 32 . The second tapered surface 33 is provided to press and hold the chuck portion 52 of the collet 5, which will be described later, against the cable C. As shown in FIG.

The sleeve 4 is provided to prevent foreign matter (for example, water, oil, dust, dirt, etc.) from entering the housing of the electrical device. The sleeve 4 is made of rubber, for example, and configured to be elastically deformable. The sleeve 4 is cylindrical and has an insertion hole 4a through which the cable C is inserted. The sleeve 4 is configured to be press-fitted between the first tapered surface 25 of the gland body 2 and the cable C. As shown in FIG.

Collet 5 is provided to hold cable C firmly. Specifically, the collet 5 is configured to hold the cable C so as not to move in the axial direction (X1 and X2 directions) and hold the cable C so as not to rotate. The collet 5 is arranged on the front side (X1 direction side) with respect to the sleeve 4 .

The collet 5 is made of synthetic resin, for example, and has an annular base portion 51 and a chuck portion 52 formed on the base portion 51, as shown in FIG. The base portion 51 has an insertion hole 51 a through which the cable C is inserted, and has an outer diameter set substantially equal to that of the sleeve 4 . The base portion 51 is formed with a protrusion 51 b that fits into the groove portion 26 . The protrusion 51b is formed to protrude radially outward from the base portion 51 . A plurality of (for example, three) protrusions 51b are provided at predetermined intervals in the circumferential direction. The collet 5 is prevented from rotating with respect to the gland body 2 by fitting the projection 51 b into the groove 26 .

The chuck portion 52 has a plurality of (for example, 12) holding arms 521 axially extending from the base portion 51 forward (X1 direction side). The plurality of holding arms 521 are arranged at predetermined intervals in the circumferential direction. An outer protruding portion 521a that protrudes radially outward is formed at the tip of each holding arm 521, and an inner protruding portion 521b that protrudes radially inward is formed. The second tapered surface 33 pushes the outer protruding portion 521a of the holding arm 521 radially inward and deforms the holding arm 521 so that the inner protruding portion 521b comes into contact with the cable C. As shown in FIG.

As shown in FIGS. 2 and 3, the wall 100 is formed with a circular attachment hole 101 to which the cable gland 1 is attached. A notch 101a is formed on the periphery of the mounting hole 101. As shown in FIG.

The lock nut 6 is a nut (made of resin, for example) for fixing the gland body 2 to the wall body 100 of the electrical equipment, and has a female thread 6a that meshes with the male thread 23a of the mounting portion 23 of the gland body 2 . That is, the cable gland 1 (see FIG. 1) is attached to the wall 100 by sandwiching the wall 100 between the lock nut 6 and the flange 21 .

The washer 7 includes a washer body 71 sandwiched between the wall 100 and the lock nut 6 , a projection 72 and a tongue 73 . This washer 7 is configured to prevent rotation of the gland body 2 with respect to the wall member 100 . The washer body 71 is formed in an annular plate shape having a circular hole 7a. The projecting portion 72 and tongue piece 73 are formed on the periphery of the circular hole 7a of the washer body 71. As shown in FIG.

The protruding portion 72 protrudes forward (X1 direction side) and is configured to be able to fit into the notch 101a of the wall 100 . The tongue piece 73 is bent rearward (X2 direction side) and configured to fit into the groove portion 28 of the mounting portion 23 . For this reason, the rotation of the washer 7 with respect to the wall 100 is restricted by fitting the projection 72 into the notch 101a, and the rotation of the gland body 2 with respect to the washer 7 by fitting the tongue 73 into the groove 28. is regulated.

The packing 8 is an annular member (made of rubber, for example) having a circular hole 8a, and is sandwiched between the flange 21 of the gland body 2 and the wall 100 of the electrical equipment. The inner diameter of the packing 8 (the diameter of the circular hole 8a) is substantially equal to the outer diameter of the external thread 23a of the mounting portion 23 of the gland body 2. As shown in FIG.

Next, a procedure for mounting the cable gland 1 having the structure described above will be described with reference to FIGS. 1 to 7. FIG.

(S1) First, the packing 8 is fitted into the mounting portion 23 of the ground body 2, and the mounting portion 23 is inserted into the mounting hole 101 of the wall 100 of the electrical equipment from the front side of the wall 100 (the front side of the housing of the electronic device). Plug in.

(S2) The washer 7 is fitted into the mounting portion 23 of the gland body 2 inserted into the mounting hole 101 of the wall 100 . At this time, the tongue piece 73 is inserted into the groove portion 28, and the projection portion 72 is fitted into the notch 101a. Then, the gland body 2 is attached (fixed) to the wall 100 by screwing the locknut 6 into the male screw 23a of the attachment portion 23 (the male screw 23a of the portion protruding to the back side of the wall 100).

(S3) The cable C is passed through the insertion hole 24 of the gland body 2, and the sleeve 4, the collet 5 and the cap 3 are passed through the cable C on the front side of the gland body 2. Then, the sleeve 4 and the collet 5 are fitted in the front side of the insertion hole 24 . Therefore, the sleeve 4 is brought into contact with the first tapered surface 25 .

(S4) The female thread 31a of the cap 3 is aligned with the male thread 22a of the cable holding portion 22 of the gland body 2, and the cap 3 is screwed into the gland body 2. As shown in FIG. During the process of screwing the cap 3, the cap 3 presses the collet 5 and the sleeve 4 rearward. At this time, the sleeve 4 is pressed rearward by the cap 3 via the collet 5 , so the sleeve 4 is press-fitted between the first tapered surface 25 and the cable C. As shown in FIG. Further, since the tip of the holding arm 521 contacts the second tapered surface 33 of the cap 3 in the collet 5 , the tip of the holding arm 521 is deformed by the second tapered surface 33 so as to move radially inward. That is, the front side of the chuck portion 52 is deformed so as to have a reduced diameter. Therefore, the cable C is held by the tip of the holding arm 521 .

-effect-
As described above, according to the cable gland 1 of the present embodiment, the sleeve 4 for suppressing the entry of foreign matter and the collet 5 for holding the cable are separately provided, so that the sleeve 4 suppresses the entry of foreign matter. Meanwhile, the collet 5 can hold the cable C so as not to rotate. As a result, a cable gland 1 conforming to JIS C 61215-2, JIS C 62790 and IP69K can be obtained.

Furthermore, in the cable gland 1 of the present embodiment, the bypass passage 27 is formed on the outer peripheral surface of the cable holding portion 22, so that even if high-pressure water is injected from the front side of the cap 3, the pressure can be released. . Moreover, compared with the case where the bypass passage is formed in the cap, it is possible to suppress the deterioration of the function of suppressing entry of foreign matter.

-Other embodiments-
In addition, the embodiment disclosed this time is an example in all respects, and does not serve as a basis for a restrictive interpretation. Therefore, the technical scope of the present invention is not to be interpreted only by the above-described embodiments, but is defined based on the claims. In addition, the technical scope of the present invention includes all modifications within the meaning and range of equivalence to the claims.

INDUSTRIAL APPLICABILITY The present invention can be effectively used for cable glands used for holding cables in electrical equipment and the like.

1 Cable Gland 2 Gland Body 3 Cap 4 Sleeve 4a Insertion Hole 5 Collet 6 Lock Nut 6a Female Thread 7 Washer 7a Circular Hole 8 Packing 8a Circular Hole 21 Flange 22 Cable Holding Part 22a Male Thread 23 Mounting Part 23a Male Thread 24 Insertion Hole 25 First Tapered surface 26 Groove 27 Bypass passage 28 Groove 31 Peripheral wall 31a Female screw 32 Front wall 32a Opening hole 33 Second tapered surface 51 Base 51a Insertion hole 51b Projection 52 Chuck 71 Washer body 72 Projection 73 Tongue 100 Wall 101 Mounting hole 101a Notch 521 Holding arm 521a Outer protrusion 521b Inner protrusion

Claims (3)

a gland body, which is a cylindrical member through which a cable can be inserted, and which has a cylindrical cable holding portion and a male screw formed on the outer peripheral surface of the cable holding portion;
A cable gland comprising a cap formed with a female thread that meshes with the male thread of the cable holding portion of the gland body,
a cylindrical sleeve having an insertion hole for passing a cable through and fitted to the cable holding portion of the gland body;
a collet having an annular base portion and a chuck portion formed on the base portion, the collet being fitted into the cable holding portion of the gland body;
The inner peripheral surface of the gland body is formed with a first tapered surface with which the sleeve contacts and a groove for preventing rotation of the collet,
The cap includes a cylindrical peripheral wall portion formed with the female thread, a front wall portion integrally formed at one end of the peripheral wall portion, and an inner corner portion between the peripheral wall portion and the front wall portion. and a second tapered surface, and an opening hole through which a cable is passed is formed in the front wall portion,
The collet has a plurality of holding arms in which projections to be fitted in the grooves are formed on the base portion, and the chuck portion extends axially from the base portion,
The sleeve is press-fitted between the cable and the first tapered surface by screwing the cap onto the male thread of the cable holding portion in a state where the sleeve and the collet are fitted in the cable holding portion of the gland body. and the holding arm is deformed radially inward by the second tapered surface to hold the cable. In the cable gland according to claim 1,
A cable gland, wherein an outer protruding portion protruding radially outward and an inner protruding portion protruding radially inward are formed at the tip of the holding arm. In the cable gland according to claim 1 or 2,
A cable gland, wherein an axially extending groove-shaped bypass passage is formed on an outer peripheral surface of the cable holding portion.

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