JP6580021B2 - Cable gland - Google Patents

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).

  For example, as shown in FIG. 6, the cable gland is a cylindrical member into which the cable C can be inserted, and a gland body 202 in which male threads 222 a and 223 a are formed on both sides of the collar part 221 and the collar part 221. , A sleeve 203 fitted into the ground body 202, a cap (cap nut) 204 to be screwed into a male screw 222 a on one side (side into which the sleeve 203 is fitted) of the ground body 202, and a lock for fixing the ground body 202 to the wall body 100. A nut 206 and the like are provided.

  In such a cable gland 201, the male screw 223a on the other side of the ground main body 202 is inserted into the mounting hole 101 formed in the wall body 100 of the casing of the electric device, and a lock nut is attached to the male screw 223a on the other side. The ground body 202 is attached to the wall body 100 by screwing 206. Thereafter, the sleeve 203 is fitted into the ground main body 202 with the cable C inserted into the insertion hole 203a of the sleeve 203, and the cap 204 is screwed into the male screw 222a on one side of the ground main body 202 (state shown in FIG. 6). From this state, the cap 204 is further screwed to tighten the sleeve 203. By tightening the sleeve 203 with the cap 204 in this way, the sleeve 203 is deformed in the diameter reducing direction, and the inner peripheral surface of the insertion hole 203 a of the sleeve 203 and the outer peripheral surface of the cable C are brought into close contact with each other. As a result, water, oil, dust, dust, etc. can be prevented from entering the housing of the electric device, and the cable C itself can be firmly held and fixed.

JP 2007-37364 A

  In the cable gland 201 shown in FIG. 6, when the sleeve 203 is deformed by tightening the cap 204, the deformation of the sleeve 203 escapes into the empty space S inside the gland main body 202 and the cap 204, and the airtight / liquid of the sleeve 203 is removed. There is a concern that the tightness and the holding force of the cable C are reduced.

  The present invention has been made in consideration of such circumstances, and in a cable gland having a gland body, a sleeve through which the cable is inserted, and a cap for tightening the sleeve, the sleeve is hermetically sealed and liquid-tight and the cable is held. It aims at providing the structure which can ensure force more reliably.

  The present invention is a cylindrical member into which a cable can be inserted, has a cylindrical cable holding portion, and has an external thread formed on the outer peripheral surface of the cable holding portion, and a conical shape in the cable holding portion. A ground body having a tapered surface; an insertion hole through which a cable passes; a cylindrical sleeve fitted into the cable holding portion; and a cap formed with a female screw engaging with the male screw of the cable holding portion; Assuming a cable gland that deforms the sleeve in the reduced diameter direction at the conical taper surface by screwing the cap into the male screw of the cable holding part in a state where the sleeve is fitted in the cable holding part of the gland body. It is said.

  Such a cable gland includes a sleeve collet to be attached to the sleeve, and the sleeve collet has a cylindrical portion that is formed in a cylindrical shape that surrounds the outer peripheral portion of the sleeve and is fitted into the outer periphery of the sleeve. The part is formed with a slit extending from the middle of the cylindrical part in the axial direction to the end part. Then, the sleeve collet is attached to the sleeve, the sleeve is fitted into the cable holding portion, and the end of the sleeve collet on the slit opening side is fitted toward the conical taper surface, and the cap is The sleeve collet is configured to be interposed between the cap and the sleeve when screwed into the male screw of the cable holding portion.

  According to the cable gland of the present invention, when the cap is screwed into the male screw of the gland main body (cable holding portion) with the sleeve fitted with the sleeve collet fitted in the cable holding portion, the sleeve is interposed between the cap and the sleeve. Collet intervenes. With such a configuration, in the process of tightening the cap, the cap and the sleeve are not in direct contact, and the cap and the sleeve collet are slid and rotated, so that the sleeve is released from the frictional force in the twisting direction. Thereby, the pressing force acting on the sleeve is made uniform over the circumferential direction of the sleeve, so that the sleeve is appropriately reduced in diameter.

  In addition, since the outer peripheral portion of the sleeve is surrounded by the sleeve collet, deformation of the sleeve in the radially outward direction is limited. Thus, when the sleeve is deformed by tightening the cap, it is possible to prevent the deformation of the sleeve from escaping into the empty space S (see FIG. 6) inside the gland main body and the cap. And it becomes possible to ensure the holding force of a cable more reliably.

  In the cable gland according to the present invention, an annular flange protruding inward from the peripheral edge of the cylindrical portion is integrated with an end portion of the cylindrical portion of the sleeve collet opposite to the open side of the slit. The sleeve collet may be configured so that the flange of the sleeve collet comes into contact with the axial end of the sleeve when the cap is screwed into the male screw of the cable holding portion. According to this structure, when the cap is tightened, the axial position of the sleeve collet with respect to the sleeve is regulated by the flange of the sleeve collet, so that the sleeve collet can be prevented from being displaced from the sleeve.

  According to the present invention, in the cable gland having the gland main body, the sleeve through which the cable is inserted, and the cap for tightening the sleeve, it is possible to more surely secure the airtightness / liquid tightness of the sleeve and the holding force of the cable. become.

It is a half longitudinal section showing an example of the cable gland of the present invention. It is a half longitudinal section showing an example of the cable gland of the present invention. FIG. 2 shows a state where the sleeve and the sleeve collet are deformed in the diameter reducing direction by tightening the cap. FIG. 2 is an exploded perspective view of the cable gland in FIG. 1. It is a half sectional view showing a state where a sleeve collet is attached to a sleeve. It is a perspective view which shows the deformation | transformation state of a sleeve and a sleeve collet. It is a semi-longitudinal sectional view showing an example of a conventional cable gland.

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

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

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

  The ground body 2 is a substantially cylindrical member (for example, made of resin), and a substantially hexagonal flange 21 is formed at the center in the axial direction (axial direction of the cylinder). Cylindrical cable holding portions 22 and attachment portions 23 are formed on both sides (both sides in the axial direction).

  A male screw 22 a is formed on the outer peripheral surface of the cable holding portion 22. A male screw 23 a is formed on the outer peripheral surface of the attachment portion 23. The attachment portion 23 is inserted into an attachment hole 101 formed in the wall body 100 of the casing of the electric device (hereinafter also referred to as the wall body 100 of the electric device).

  In the following description, the cable holding portion 22 side (cap 4 side of the cable gland 1) of the ground body 2 is referred to as a front side, and the opposite side is referred to as a rear 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 (in the cable holding portion 22), a cone for pressing a sleeve 3 described later inwardly (in the direction of reduced diameter). A tapered surface 24b is formed, and a cable holding hole 24a is formed on the front side of the tapered surface 24b. The conical tapered surface 24b is a tapered surface whose diameter decreases toward the rear side. Then, a sleeve 3 and a sleeve collet 7 described later are fitted into the cable holding hole 24a.

  The sleeve 3 is a cylindrical member made of rubber, for example, and includes a cylindrical portion 31 and a flange 32, and the cylindrical portion 31 and the flange 32 are integrally formed. The flange 32 is an annular outer flange that protrudes outward from the peripheral edge of the end portion on the rear side of the cylindrical portion 31 (the end portion on the conical tapered surface 24b side of the cable holding portion 22). The sleeve 3 is formed with an insertion hole (through hole) 3a through which the cable C passes along the axial direction. The axial length of the sleeve 3 is a length that protrudes a predetermined amount from the end portion (front end portion) of the ground body 2 in a state where the sleeve 3 is fitted in the cable holding hole 24 a of the ground body 2. ing.

  The cap 4 is a cap nut-like member (for example, made of resin) having a peripheral wall portion 41 having a substantially hexagonal outer peripheral surface and a front wall portion 42 that covers the front side of the peripheral wall portion 41. A female screw 41 a that meshes with the male screw 22 a of the cable holding portion 22 of the ground body 2 is formed on the inner peripheral surface of the peripheral wall portion 41 of the cap 4.

  In the center of the front wall portion 42 of the cap 4, a circular hole 42 a for passing the cable C is formed. Further, the cap 4 is formed with a tapered tapered surface 42 b at the inner corner between the peripheral wall portion 41 and the front wall portion 42. The central axis of the tapered tapered surface 42b coincides with the central axis of the female screw 41a. The conical taper surface 42b is a taper surface whose diameter increases toward the rear side (the side opposite to the front wall portion 42).

  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 of the electric device (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 23a of the mounting portion 23 of the gland body 2.

  The lock nut 6 is a nut (for example, made of resin) for fixing the ground main body 2 to the wall body 100 of the electric device, and is formed with a female screw 6 a that meshes with the male screw 23 a of the mounting portion 23 of the ground main body 2.

  The sleeve collet 7 is attached to the sleeve 3. The sleeve collet 7 is a thin member made of a synthetic resin (for example, nylon or polyamide) having toughness and high lubricity. The sleeve collet 7 has a cylindrical portion 71 and a flange 72 formed in a cylindrical shape surrounding the sleeve 3 (cylindrical portion 31), and the cylindrical portion 71 and the flange 72 are integrally formed. The flange 72 is an annular inner flange that protrudes inward from the peripheral edge of the end portion on the front side of the cylindrical portion 71 (the end portion opposite to the opening side of the slit 73a).

  The inner diameter of the cylindrical portion 71 of the sleeve collet 7 corresponds to the outer diameter of the cylindrical portion 31 of the sleeve 3, and the cylindrical portion 71 of the sleeve collet 7 can be fitted in a state of being in close contact with the cylindrical portion 31 of the sleeve 3. it can. The outer diameter of the cylindrical portion 31 of the sleeve collet 7 is substantially equal to the outer diameter of the flange 32 of the sleeve 3. Further, the outer diameter of the cylindrical portion 71 of the sleeve collet 7 corresponds to the inner diameter of the cable holding hole 24 a of the ground body 2. Further, the length of the cylindrical portion 71 of the sleeve collet 7 is substantially equal to the length of the cylindrical portion 31 of the sleeve 3.

  The cylindrical portion 71 of the sleeve collet 7 has a portion extending from the middle of the cylindrical portion 71 in the axial direction to the end on the rear side along the axial direction (the end on the conical tapered surface 24b side of the cable holding portion 22). A plurality of (strip 12) slits 73a... 73a extending in a uniform width are formed. The slits 73a and 73a are arranged rotationally symmetrically about the cylindrical axis of the sleeve collet 7. Each slit 73 a is open at the end of the cylindrical portion 71. Hereinafter, a portion where the slits 73a... 73a are formed is referred to as a slit forming portion 73.

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

  (S1) First, the sleeve 3, the cap 4, the packing 5, the lock nut 6, and the sleeve collet 7 are disassembled from the gland body 2.

  (S2) The packing 5 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 body 100 of the electric device from the front side of the wall body 100 (the front side of the casing of the electronic device).

  (S3) By screwing the lock nut 6 into the male screw 23a of the mounting portion 23 of the ground body 2 inserted into the mounting hole 101 of the wall body 100 (the male screw 23a protruding from the back side of the wall body 100), the ground body 2 Is attached (fixed) to the wall body 100.

  (S4) As shown in FIG. 4, the sleeve collet 7 is mounted on the outer periphery of the sleeve 3. Next, in a state where the cable C is passed through the sleeve 3 and the cap 4, the sleeve 3 and the sleeve collet 7 are placed in the cable holding hole 24a of the gland body 2, and the end of the sleeve collet 7 on the opening side of the slit 73a is a tapered tapered surface 24b. Fit in the state of facing.

  (S5) The cap 4 is screwed into the ground body 2 by aligning the female thread 41a of the cap 4 with the male thread 22a of the cable holding portion 22 of the ground body 2. In the screwing process of the cap 4, the sleeve collet 7 is pressed rearward by the cap 4, and the rear end portion of the sleeve 3 is pressed by the conical tapered surface 24 b of the ground body 2. As a result, the sleeve 3 is deformed in the diameter reducing direction, and the slit forming portion 73 of the sleeve collet 7 is also deformed in the diameter reducing direction (see FIGS. 2 and 5). Then, the inner peripheral surface of the insertion hole 3 a of the sleeve 3 and the outer peripheral surface of the cable C are in close contact with each other in a state where the screwing (tightening) of the cap 4 is completed. As a result, it is possible to prevent dust and dirt from entering the housing of the electric device, and to firmly hold and fix the cable C itself.

<Effect>
As described above, according to the cable gland 1 of the present embodiment, the sleeve collet 7 is attached to the sleeve 3, and the sleeve 3 is inserted into the cable holding portion 22 (cable holding hole 24 a) and the slit 73 a of the sleeve collet 7. A structure in which the sleeve collet 7 is interposed between the cap 4 and the sleeve 3 when the cap 4 is screwed into the male screw 22a of the ground body 2 with the end on the open side being fitted toward the tapered surface 24b. is doing. With such a configuration, in the process of tightening the cap 4, the cap 4 and the sleeve 3 are not in direct contact with each other, and the cap 4 and the sleeve collet 7 slide and rotate, so that the sleeve 3 is released from the frictional force in the twisting direction. The As a result, the pressing force acting on the sleeve 3 is made uniform in the circumferential direction of the sleeve 3, so that the sleeve 3 is appropriately reduced in diameter.

  Moreover, since the outer peripheral portion of the sleeve 3 is surrounded by the sleeve collet 7, the deformation of the sleeve 3 to the radially outer side is limited. Thereby, when the sleeve 3 is deformed by tightening the cap 4, it is possible to prevent the deformation of the sleeve 3 from escaping into the empty space S (see FIG. 6) inside the ground body 2 and the cap 4. It is possible to ensure the airtightness / liquid tightness and the holding force of the cable C more reliably.

  Further, in the cable gland 1 of the present embodiment, the end of the cylindrical portion 71 is inward from the front end of the cylindrical portion 71 of the sleeve collet 7 (the end opposite to the opening side of the slit 73 a). Since the flange 72 that projects toward the sleeve 4 is formed, when the cap 4 is tightened, the flange 72 of the sleeve collet 7 hits the front end of the sleeve 3, and the axial position of the sleeve collet 7 relative to the sleeve 3 is restricted. Is done. Thereby, it is possible to prevent the sleeve collet 7 from being displaced from the sleeve 3.

-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 meaning and scope equivalent to the scope of the claims.

  For example, in the above embodiment, the number of slits 73a of the sleeve collet 7 is 12. However, the present invention is not limited to this, and the number of slits is an arbitrary number other than 12. Also good.

  In the present invention, the cross-sectional structure and the like of the members constituting the cable gland can be appropriately modified within a range that does not affect the connection between the sleeve, the sleeve collet, and the cap. The number and thickness of the insertion holes formed in the sleeve are not limited to the above embodiment.

  In addition, the cable gland of the present invention is not only used for power distribution and communication cables, but also for protecting electric wires without a sheath (sheath), protective pipes for accommodating electric wires, pipes for sending fluids, etc. Therefore, the “cable” in the present invention includes those wires and pipes.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for a cable gland used when holding a cable in an electric device or the like.

DESCRIPTION OF SYMBOLS 1 Cable gland 2 Gland main body 21 Cage part 22 Cable holding part 22a Male screw 23 Mounting part 23a Male screw 24 Insertion hole 24a Cable holding hole 24b Conical taper surface 3 Sleeve 3a Insertion hole 4 Cap 41a Female screw 42b Conical taper surface 5 Packing 6 Lock nut 7 Sleeve collet 71 Cylindrical part 72 Flange 73 Slit forming part 73a Slit

Claims (2)

It is a cylindrical member that can be inserted into a cable, and has a cylindrical cable holding portion. A male thread is formed on the outer peripheral surface of the cable holding portion, and a conical tapered surface is formed in the cable holding portion. Grounded body,
A cylindrical sleeve having an insertion hole for passing a cable, and fitted into the cable holding portion;
A cap formed with an internal thread that meshes with the external thread of the cable holding portion, and
In a state where the sleeve is fitted in the cable holding portion of the gland body, by screwing the cap onto the male screw of the cable holding portion, the cable gland that deforms the sleeve in the reduced diameter direction on the conical tapered surface,
A sleeve collet mounted on the sleeve;
The sleeve collet has a cylindrical portion that is formed in a cylindrical shape that surrounds the outer peripheral portion of the sleeve and is fitted into the outer periphery of the sleeve, and the cylindrical portion extends from the middle in the axial direction of the cylindrical portion to the end portion. A slit is formed,
The sleeve collet is attached to the sleeve, and the cap is held in the cable holding portion while the sleeve is fitted into the cable holding portion with an end portion on the slit opening side of the sleeve collet facing the conical taper surface. The cable gland is configured such that the sleeve collet is interposed between the cap and the sleeve when screwed into the male screw of the portion. The cable gland according to claim 1,
An annular flange projecting inward from the peripheral edge of the cylindrical portion is integrally formed at an end portion of the cylindrical portion of the sleeve collet opposite to the slit opening side, and the cap The cable gland is configured so that a flange of the sleeve collet comes into contact with an end portion in the axial direction of the sleeve when the screw is screwed into the male screw of the cable holding portion.

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