JPH10326978A - Cable waterproof structure of apparatus cabinet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable waterproof structure wherein waterproofness between a cable and a packing can be increased. SOLUTION: A cable waterproof structure is provided with a cylindrical main body, 4 attached on an aperture 1a of an apparatus cabinet 1, a cap 7 attached on the outer end portion of the main body part 4, and a packing 8 which is penetrated by a cable 2 and clamped between the main body 4 and the cap 7. The packing 8 is constituted of an outer packing 9 which has an inner diameter hole 9a and is compressively clamped between the main body 4 and the cap 7, and an inner packing 10 which is penetrated by the cable 2 in the state of close contact and fitted in the inner diameter hole 9a of the outer packing 9. In the outer packing 9, radially compressive force is generated by clamping force. The diameter of the inner packing 10 is compressed by the radially compressive force, so that close contact with the cable 2 is increased, and waterproofness is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure provided in a housing of a communication device or the like installed outdoors, and more particularly to a waterproof structure of a cable drawn out of a device housing.

[0002]

2. Description of the Related Art In equipment housings installed outdoors, when a cable is drawn from the inside of the equipment housing to the outside, raindrops and the like enter into the housing through an opening provided in the equipment housing to allow the cable to be inserted. A waterproof structure for preventing intrusion is required. FIG. 7 is a cross-sectional view showing an example of this type of waterproof structure, which is an example described in Japanese Utility Model Laid-Open No. 5-11483. This waterproof structure is provided with an opening 1 provided in the device housing 1.
a, a cylindrical body 4 attached to the main body 4, a cap 7 attached to an outer end of the body 4, and a packing 8 sandwiched between the body 4 and the cap 7. It consists of. The main body has an annular nut 5 screwed to a flange 4a provided on the outer periphery and a screw portion 4b provided on the inner end.
Are fixed to the opening 1a of the device housing 1 with the seal ring 6 interposed therebetween. Further, the cap portion 7 is connected to the main body portion 4.
Is screwed into a screw portion 4c provided at the outer end of the. The packing 8 is formed in an annular shape having a slit in a part of the circumference. A cable 2 having connectors 3a and 3b attached to both ends thereof is inserted therein, and a tapered convex surface 8a is provided on one side surface thereof. , Abuts against a tapered concave surface 4d provided at the outer end of the main body 4.

In this waterproof structure, the cable 2 is inserted into the packing 8 and is inserted into the main body 4 together with the packing 8. And the cap part 7 is inserted from the outside,
By screwing the cap portion 7 to the main body portion 4, the packing 8 is compressed and held between the main body portion 4 and the cap portion 7, and waterproofs the space between the main body portion 4 and the cap portion 7. Also,
Since the tapered convex surface 8a of the packing 8 is pressed against the tapered concave surface 4d of the main body 4 by the compressive holding force at this time, the diameter of the packing 8 is reduced by the diameter reducing force generated by the wedge action, and the packing 8 comes into close contact with the outer surface of the cable 2 and It is possible to enhance the waterproof effect between the packing 8.

[0004]

In this conventional waterproof structure, the cable 2 having the connectors 3a and 3b attached to and removed from the packing 8 can be inserted and removed, which is particularly advantageous when the cable 2 is replaced. It becomes something. However, in this conventional waterproof structure, there is a problem particularly in the waterproofness between the cable 2 and the packing 8. That is, if a soft material is used for the packing 8, the packing 8 is easily compressed and deformed in the axial direction by the compressive clamping force between the main body 4 and the cap 7, so that the tapered convex surface 8a and the tapered concave surface 4d of the main body 4 have The wedge force generated between them becomes small, the diameter of the packing 8 is hard to be reduced, the close contact between the cable 2 and the packing 8 is reduced, and the waterproof effect is reduced. Conversely, if a hard material is used for the packing 8, the wedge force by the tapered convex surface 8a and the tapered concave surface 4d can be increased, but the packing 8 itself is less likely to be elastically deformed in the diameter reducing direction. In addition, the closeness between the cable 2 and the packing 8 is reduced, and the waterproof effect is reduced.

[0005] It is an object of the present invention to provide a cable waterproof structure capable of enhancing the waterproofness between a cable and a packing.

[0006]

A cable waterproof structure according to the present invention has a tubular main body attached to an opening provided in an equipment housing, and is attached to an outer end of the main body. A cap portion having a cable insertion hole, and a packing in which a cable inserted through the opening portion is closely inserted and sandwiched between the main body portion and the cap portion, wherein the packing has an inner diameter hole. An outer packing that is compression-clamped between the main body and the cap, and an inner packing into which the cable is inserted in a tight state and that is fitted into an inner diameter hole of the outer packing. Features. Especially,
The main body is provided with a tapered concave surface on the inner diameter surface side at the outer end thereof, the outer packing is provided with a tapered convex surface which is in contact with the tapered concave surface, and the outer packing is formed by the main body and the cap. When sandwiched in the axial direction between the tapered concave surface and the tapered convex surface, a radial reduction force is applied by a wedge action, and the radial reduction force is applied to the inner packing. Further, it is preferable that the inner packing is formed of a material that is more flexible than the outer packing.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view of an embodiment of the waterproof structure of the present invention. FIG. 2A is a sectional view of the assembled state. An opening 1a is provided in a device housing 1 such as a communication device, and a cable 2 having connectors 3a and 3b connected to both ends thereof is inserted into the opening 1a. A cylindrical main body 4 is fixed to the opening 1a so as to be inserted therethrough. The main body 4 has a flange 4a formed on the outer peripheral surface at substantially the center in the cylinder axis direction, and has threaded portions 4b and 4c formed at its inner end and outer end, respectively. In addition, a tapered concave surface 4d formed in a conical shape in the inner diameter direction is formed at the outer end. And
The screw portion 4b at the inner end is inserted into the opening 1a,
It is attached so that the opening 1a of the device housing 1 is clamped by the annular nut 5 screwed into the screw portion 4b from the inside of the device housing 1. A seal ring 6 is interposed between the flange 4a and the device housing 1, and waterproofing is performed between the opening 1a and the outer periphery of the main body 4.

On the other hand, a screw 4c at the outer end of the main body 4
A circular shallow dish-shaped cap portion 7 having a cable insertion hole 7a is screwed into the screw portion. Then, a packing 8 is sandwiched between the main body 4 and the cap 7. As shown in the front views of FIGS. 2B and 2C, the packing 8 has an outer packing 9 having an annular shape whose outer diameter is somewhat larger than the inner diameter of the main body, and an outer packing 9. Inner packing 1 having an outer diameter slightly larger than inner diameter hole 9a
0. The outer packing 9 is formed of a relatively hard material, a conical tapered convex surface 9b is formed on one side surface, and a radial slit 9c is formed on a part of the circumference thereof. . The inner packing 10 is formed of a relatively soft material. A cable hole 10a having a diameter slightly smaller than the outer diameter of the cable 2 is opened at the center of the inner packing 10. Is formed with a radial slit 10b.

In the waterproof structure having this structure, the procedure for forming the assembly structure shown in FIG. 2 is as follows. First, the screw portion 4b at the inner end of the main body portion 4 is opened together with the seal ring 6 from the outside of the device housing 1 through the opening 1a. And insert the annular nut 5 from inside the device housing 1
Is screwed into the screw portion 4b and fixed by fastening. The cable 2 is inserted into the cable hole 10a through the slit 10b of the inner packing 10 while the connectors 3a and 3b are connected. Further, the inner packing 10 is fitted into the inner diameter hole 9a through the slit 9c of the outer packing 9. Then, the cable 2 is inserted through the main body 4, and the packing 8 in which the inner packing 10 and the outer packing 9 are integrated is positioned to face the outer end of the main body 4. Further, the cap portion 7 into which the cable 2 has been inserted is screwed into the screw portion 4c at the outer end of the main body portion 4, and the fastening is performed. As a result, the packing 8 is sandwiched between the outer end of the main body 4 and the inner surface of the cap 7, and the packing 8 is brought into close contact with the main body 4 and the cap 7 by the compressive holding force at that time, thereby waterproofing the both. .

At this time, since the tapered convex surface 9b provided on the outer packing 9 abuts against the tapered concave surface 4d of the main body 4, the packing 8 generates a force in the diameter reducing direction due to the wedge force. The inner diameter hole 9a of the outer packing 9 is reduced in diameter by the deformation permitting action at the slit 9c. Further, the inner packing 10 is similarly reduced in diameter by receiving the diameter reducing force, so that the tightness between the inner packing 10 and the cable 2 is enhanced in the cable hole 10a, and the waterproof effect is enhanced. In the waterproof structure of this embodiment, since the outer packing 10 is formed of a relatively hard material, the outer packing 10 is also suppressed from being deformed by the clamping force between the main body 4 and the cap 7,
A large wedge force on the tapered convex surface 9b and a large diameter reduction force generated by the wedge force are obtained. On the other hand, since the inner packing 10 is formed of a relatively flexible material, the inner packing 10 is sufficiently compressed and deformed by a large diameter reducing force generated by the outer packing 9, and the close contact with the cable 2 is improved, Water resistance between the cable 2 and the cable 2 is extremely high.

Here, the waterproof structure of the present invention can cope with various cables by replacing the inner packing 10 with a different type. FIG. 3A is a cross-sectional view of a waterproof structure in which a plurality of cables are collectively inserted into the opening 1a of the device housing 1 to obtain a waterproof effect. The main body 4, the cap 7, and the outer packing 9 are shown in FIG. Those described above can be used as they are. On the other hand, in the inner packing 10A, a plurality of small-diameter four cable holes 10c corresponding to four cables are radially arranged as shown in the front view of FIG. In this embodiment, a slit 10b is provided on the outer peripheral side of each cable hole 10c.
After the cable 2 is inserted into each cable hole 10c by using 0b, the inner packing 10A is fitted into the inner diameter hole 9a of the outer packing 9. After that, it is the same as the above embodiment, and the four cables can be collectively waterproofed.

Also in this configuration, the inner packing 10A is formed of a relatively flexible material, so that the inner packing 10A is formed.
The closeness between A and each of the plurality of cables 2 is improved, and an effective waterproof structure is obtained. Each cable 2 is connected to a connector 3
In the same manner as in the above-described embodiment, it can be inserted into the inner packing 10A and the outer packing 9 with the a and 3b connected, and can be mounted on the device housing 1.

Further, in the present invention, as shown in the sectional view and the front view in FIGS. 4 (a) and 4 (b), by using the inner packing 10B having no cable hole,
When it is not necessary to insert a cable, the opening 1a of the device housing 1 can be closed. Even in this case,
The tightness between the inner packing 10B and the outer packing 9 is enhanced, and an effective waterproofing effect is obtained.

In the above-described embodiment, the outer packing and the inner packing are formed of different materials. However, even when the same material is used, the outer packing and the inner packing are formed separately so that each packing can be formed separately. Since the deformation operation is individual, the diameter reduction force of the outer packing can be increased and the closeness of the inner packing to the cable can be increased as compared with the integrated packing shown in FIG. It is possible to enhance the waterproof effect more than the waterproof structure of FIG.

In addition, since the outer packing and the inner packing are separated from each other, when the cable is replaced, only the inner packing needs to be replaced by using the outer packing as it is. As a result, the packing to be replaced can be formed in a small size, so that the material cost can be reduced and the storage space can be reduced.

[0016]

As described above, according to the present invention, the packing, which is sandwiched between the main body and the cap and is in close contact with the cable, is constituted by the outer packing and the inner packing inserted into the inner diameter hole. So that the cable with the connector connected to both ends can be replaced together with the inner packing,
The workability of cable replacement can be improved,
The waterproof effect of the replaced cable can be ensured. In addition, since the tightness between the inner packing and the cable can be increased by the diameter reducing force generated by the outer packing, the waterproof effect can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a main part of a cable waterproof structure according to the present invention.

FIG. 2 is a sectional view of the assembled state of the cable waterproof structure of FIG. 1 and a front view of the packing.

FIG. 3 is a cross-sectional view showing a state in which different cables are mounted and a front view of a packing thereof.

FIG. 4 is a cross-sectional view in a state where a cable is not mounted and a front view of a packing thereof.

FIG. 5 is a sectional view of an example of a conventional cable waterproof structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device housing 1a Opening 2 Cable 3a, 3b Connector 4 Main part 4d Tapered concave surface 5 Annular nut 6 Seal ring 7 Cap part 8 Packing 9 Outer packing 10, 10A, 10B Inner packing

Claims (5)

[Claims] 1. A cap body having a cylindrical main body attached to an opening provided in a device housing, a cable insertion hole attached to an outer end of the main body, and the opening. In a cable waterproof structure of an equipment housing comprising: a cable inserted in close contact with a packing inserted between the main body and the cap, the packing has an inner diameter hole; Cable waterproof, comprising: an outer packing compressed and held between a portion and a cap portion; and an inner packing into which the cable is closely inserted and which is fitted into an inner diameter hole of the outer packing. Construction. 2. The main body portion has a tapered concave surface on an inner diameter surface side at an outer end thereof, a tapered convex surface provided on the outer packing in contact with the tapered concave surface, and the outer packing is formed by the main body portion. And the cap portion is configured to apply a diameter reducing force by a wedge action between the tapered concave surface and the tapered convex surface when being sandwiched in the axial direction between the tapered concave surface and the tapered convex surface. The cable waterproof structure according to claim 1. 3. The cable waterproof structure according to claim 2, wherein a radial slit is formed on a part of the circumference of the outer packing. 4. The inner packing is provided with a cable hole corresponding to the diameter of the cable to be inserted and the number of cables, and a slit communicating with the cable hole is formed in a circumferential portion. The cable waterproof structure according to claim 2, wherein the cable waterproof structure is insertable. 5. The cable waterproof structure according to claim 1, wherein the inner packing is formed of a material that is more flexible than the outer packing.