JPH09312927A - Cable insertion hole sealing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a workability in taking an optical cable in and out by making an adaptor in such a structure that axis lines of slits through which the cables are taken in and out may be shifted from those of cable holes. SOLUTION: An elastic adaptor 20 has an outer face 25 which abuts against an inner face of a cable insertion hole 24, cable holes 26 which are so formed that their axis lines may be parallel with each other when the adaptor is inserted into the cable insertion hole 24, and slits 27 through which optical cables 21 can be taken in and out of the cable holes 26. The axis lines of the slits 27 are shifted from those of the cable holes 26 and communicate with the outer face 25 of the adaptor 20 from a place near the center of a cross section of the adaptor 20. When the optical cable 21 are passed through the slits 27 and are taken in and out of the cable holes 26, the work can be done easily just by deforming parts of the adaptor 20 which are near the cable holes 26 since the axis lines of the slits 27 are shifted from central axis lines of the cable holes 26. As a result, a workability in taking the cables in and out can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable introduction hole sealing member used for a cable introduction hole formed in a cable connection box or the like.

[0002]

2. Description of the Related Art A cable introduction hole formed in a cable connection box or the like is generally sealed in a watertight or airtight manner by fitting an elastic body adapter formed of an elastic material such as rubber. FIG. 10 shows a conventional elastic body adapter 1.
Is shown. The elastic body adapter 1 is a disc-shaped member made of rubber or the like, and has two cable holes 3 formed in the center for holding the optical cable 2 when it is integrated.

FIG. 11 shows another example of the conventional elastic body adapter 4. The elastic body adapter 4 shown in FIG. 11 is an integral disk-shaped member made of an elastic material such as rubber, and has two cable holes 5 formed in the center thereof. Each of these cable holes 5 is provided along an axis parallel to the central axis of the elastic adapter 4. The elastic adapter 4 has a slit 7 for inserting the optical cable 2 into the cable hole 5 from the outer peripheral surface 6. The slit 7 extends in the radial direction of the cable hole 5 and communicates with the outer peripheral surface 6.

[0004]

By the way, in the elastic body adapters 1 and 4, the optical cable 2 in a part of the cable holes 3 and 5 is inserted and replaced in the other cable holes 3 and 5, respectively. There is a problem that the optical cable 2 that is present is likely to be affected and the workability is poor. That is, in the case of the elastic body adapter 1 shown in FIG. 10, the elastic body adapter 1
The new optical cable 2 cannot be inserted into the cable hole 3 unless it is divided and re-integrated, and the holding of the existing optical cable 2 is once released and the operation line of the existing optical cable 2 is not affected. Need to proceed carefully. Further, in the case of the elastic body adapter 4 shown in FIG. 11, since the slit 7 is formed at the position passing through the central axis of the cable hole 5, the slit 7 is opened to insert the optical cable 2 into the cable hole 5. Since the displacement amount of the elastic body adapter 4 becomes large at some time, the existing optical cable 2
Therefore, it takes a lot of time and labor to perform the work without affecting the communication of the existing optical cable 2, and the workability is deteriorated.

As shown in FIG. 12, in the elastic body adapter 9 having three or more cable holes 8 formed in a straight line, the elastic body adapter 9 is elastic especially when the optical cable 2 is inserted into and taken out from the central cable hole 8. Since the existing optical cable 2 in the other cable hole 8 needs to be largely curved outward after the body adapter 9 is deformed, the work is performed carefully so that the communication is not affected by vibration or the like in a live state. Therefore, there is a problem that workability is deteriorated. The three optical cables 2 held by the elastic adapter 9 are arranged in parallel in a row by the fixture 10 shown in FIG. In the work of taking in and out the optical cable 2 by pulling it, it is necessary to once release the fixed state of the existing optical cable 2 in the outer cable hole 8 and pull it out from the fixture 10, which is troublesome.

As shown in FIG. 14, even when the optical cables 2 are introduced from a plurality of different cable introduction holes 11, if a total of three or more optical cables 2 are arranged in parallel, when the optical cables 2 are taken in and out at the central portion of the parallel arrangement. It is necessary to release the grip of the outer optical cable 2.

Further, the elastic adapter has a problem that it is difficult to take out the plug for closing the empty cable hole, and the workability of adding the optical cable 2 is deteriorated. FIG. 15 shows the closure plug 12. In the figure, a closure plug 12
Is a columnar body having a cylindrical outer peripheral surface 15 that fits into the cable hole 14 of the elastic body adapter 13, and is inserted into the cable hole 14 so as to project on the inner surface side of the cable hole 14 (not shown). The protrusion is pressed against the outer peripheral surface 15,
The cable hole 14 is sealed in a watertight or airtight manner. Elastic adapter 1 using this plug 12
No. 3 is the opening portion 1 in which the compressive force at the time of sealing the cable introduction hole is opened to the cable hole 14 of the slit 17 due to the slit 17 extending in the radial direction of the cable hole 14.
8 acts in the direction in which it is pushed open, and the slit 17
Sealing material (made of unvulcanized rubber)
(Having a high degree of flexibility) is extruded from the vicinity of the slit opening 18, and the projections form the obstruction plug 12 and the cable hole 14.
It becomes easy to flow into the gap formed between and. For this reason, when the blocking plug 12 is taken out in a later step, the flown sealing material sometimes causes pulling resistance of the blocking plug 12, resulting in a decrease in workability. If there is no protrusion on the inner surface of the cable hole 14, a blocking plug having a protrusion on the outer peripheral surface is used, but in this case as well, the sealing material easily flows and the workability of taking out the blocking plug 28 decreases.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cable introduction hole sealing member that improves the workability of adding or taking out an optical cable to be introduced into a cable connection box or the like. It is a thing.

[0009]

In order to solve the above-mentioned problems, in the cable introducing hole sealing member according to the present invention, an inner surface of the cable introducing hole formed in a cable connection box or the like and a cable inserted into the cable introducing hole. In a cable introducing hole sealing member that seals the cable introducing hole in a watertight or airtight manner by being interposed between the outer peripheral surface and the outer peripheral surface that abuts the inner surface of the cable introducing hole, and the axis of the cable introducing hole. It has a cable hole penetrating in parallel and a slit penetrating from the cable hole over the outer peripheral surface and having a slit that allows the cable to be taken in and out of the cable hole, and the axis of the slit is from the axis of the cable hole. The fact that they are displaced was taken as the means for solving the above problems.

In the cable introducing hole sealing member according to a second aspect of the present invention, the cable introducing hole sealing member has a plurality of cable holes, and these cable holes are substantially arranged with respect to the arrangement plane of the cable introducing holes formed by arranging a plurality of them on the same plane. The arrangement in the vertical direction is the means for solving the above-mentioned problems.

The cable introducing hole sealing member according to claim 3 is provided with a closing plug which is inserted into the cable hole into which the cable is not inserted, and an opening portion which opens to the cable hole of the slit is provided on a side portion of the closing plug. Further, the present invention has been made to solve the above-mentioned problems by providing a protrusion that abuts on the inner surface of the cable hole around it and closes the opening.

The operation of the invention described in each claim will be described below. According to the invention of claim 1, since the axis of the slit is displaced from the axis of the cable hole, the cable introducing hole sealing member is taken out of the cable introducing hole when the cable is taken in and out of the cable hole. Since only the vicinity of the cable hole of the cable introduction hole sealing member needs to be deformed, the work can be efficiently performed without affecting the cables inserted in the other cable holes by vibration or the like. Further, according to the invention of claim 1, in the cable introduction hole sealing member applied to the optical cable, since the influence of vibration or the like caused by the work of putting the optical cable in and out of the cable hole does not affect the existing optical cable, Even in the line state, the work can be performed without affecting the communication of the optical cable.

According to the second aspect of the present invention, since the cable holes of the same cable introducing hole sealing member are arranged in a direction substantially perpendicular to the arrangement of the cable introducing holes, the inside cable can be taken out without taking out the cable. It is possible to insert and remove the cable.

According to the third aspect of the present invention, since the projection of the plug for closing the cable hole is brought into contact with the opening of the slit that opens to the inner surface of the cable hole, the inner surface of the cable hole is pressed against the plug. When the compressive force to be applied acts on the cable introduction hole sealing member, the protrusion prevents the sealing material near the slit opening from flowing.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a cable introducing hole sealing member of the present invention will be described below with reference to FIGS. Reference numeral 20 in the figure denotes a cable introduction hole sealing member (hereinafter referred to as “elastic body adapter”) applied to the closure 22 that accommodates the optical connection portion of the optical cable 21. As shown in FIGS. 1 and 2, the elastic adapter 20 includes a closure 22.
The axial direction (the horizontal direction in FIG. 1 and the depth direction in the plane of FIG. 2) of the above is fitted into the cable introduction holes 24 opened in the end face portions 23 at both ends, so that the cable introduction hole 23 can be sealed in a watertight or airtight manner. It is a disk-shaped member. This elastic adapter 20 is made of CR (chloroprene rubber), NBR (nitrile rubber), EPDM, thermoplastic elastomer, etc.
Hardness 30 to 80 measured by a hardness tester specified by IS standard A
The angle is preferably about 55 degrees, and is flexible enough to be elastically deformed by a human hand.

Hereinafter, referring to FIG. 3, the elastic body adapter 20 will be described.
Will be described in detail. In the figure, the elastic body adapter 20
Is a cylindrical outer peripheral surface 25 that is in contact with the inner surface of the cable introduction hole 24, and the elastic adapter 20 that is connected to the cable introduction hole 24.
The cable hole 26 which is provided so as to be parallel to the axis of the cable introduction hole 24 when fitted into the
6 through the outer peripheral surface 25, the cable hole 26
And a slit 27 that allows the optical cable 21 to be taken in and out. A rib 25a is provided at both ends of the outer peripheral surface 25 in the axial direction, and the elastic body adapter 20 generates a resistance force for pulling out the elastic body adapter 20 from the cable introduction port 24.
Is protruding. Two cable holes 26 are formed,
The elastic body adapters 20 are evenly arranged in the cross-sectional diameter direction. The slit 27 has its axis displaced from the axis of the cable hole 26, and communicates with the outer peripheral surface 25 from a position of each cable hole 26 near the central portion in the sectional direction of the elastic body adapter 20. In addition, the slit 27 related to each cable hole 26
Lie parallel to each other when closed.

FIGS. 4 and 5 show a blocking plug 28 for blocking the empty cable hole 26 of the elastic adapter 20. In the figure, the blocking plug 28 has a columnar blocking plug body 29. At a plurality of positions in the axial direction of the plug body 29,
Flange 3 that extends annularly in the outer peripheral direction of the closure plug body 29
0 is projected. These flanges 30 generate a pullout resistance force of the blocking plug 28 with respect to the cable hole 26 when the blocking plug 28 is fitted into the cable hole 26. A ridge 31 is provided on one side of the closure plug body 29 so as to extend along the axial direction thereof. The ridge 31 is in contact with the opening 32 of the slit 27, which opens in the cable hole 26, and the inner surface of the cable hole 26 around the opening 32, thereby sealing the slit 27 with high flexibility (not shown). It is designed to be pressed to prevent it from flowing toward the cable hole 26 side. Ribs 33, which generate a pull-out resistance force with respect to the cable hole 26, are provided at both ends of the closure plug body 29 in the longitudinal direction. The ridge 31 corresponds to the protrusion of claim 3.

Next, the closure 22 will be described with reference to FIGS. 2 and 1. In the figure, a closure 22 has a sleeve 34 having a halved cylindrical shape and an end face portion 23 that closes both axial end faces of the sleeve 34, and the sleeve 34 and the end face portion 23 form a watertight or airtight internal space. Can be formed. Inside the closure 22, a connecting rod 36 is accommodated in which gripping metal fittings 35 for gripping and fixing the sheath portion of the optical cable 21 introduced through the cable introduction hole 24 are fixed to both ends in the longitudinal direction. The closure 22 corresponds to the cable junction box according to claim 1.

The connecting rod 36 is an elongated member having a size substantially equal to the axial direction of the closure 22 and is arranged along the axial direction of the closure 22. Grip fitting 3
5 are located at both ends of the closure 22 in the axial direction, and are designed to grip and fix the optical cable 21 near the end face portion 23. A tension member fixing metal fitting 38 for gripping and fixing the tension member 37 exposed at the end of the optical cable 21 gripped and fixed by the gripping metal fitting 35 is fixed to the connecting rod 36 closer to the central portion in the longitudinal direction than the gripping metal fitting 35. Further, at the central portion in the longitudinal direction of the connecting rod 36, the grip fitting 35 and the tension member fixing fitting 38 are provided.
Storage trays 40 in the form of thin plates having an external appearance for storing an unillustrated optical connection portion between the optical fiber core wires 39 drawn out from the end of the optical cable 21 fixed by are stacked in multiple stages. A fusion splicing part or a connector connecting part is applied as the optical connecting part. The sleeve 34 can be opened and closed by operating the fastener 41 that integrates the sleeve 34 to adjust the fastening force.

As shown in FIG. 2, two cable introduction holes 24 are opened in parallel in the end face portion 23, and an elastic body adapter 42 having one cable hole is fitted into one of the cable introduction holes 24. The elastic body adapter 20 of the present embodiment is fitted into the other cable introduction hole 24. These cable introduction holes 24 are located on the same horizontal (horizontal direction in FIG. 2) arrangement plane when the closure 22 is installed. Further, the elastic body adapter 20 is fitted so that the cable holes 26 are arranged in a direction perpendicular to the arrangement plane of the cable introduction holes 24. The optical cables 21 introduced into the closure 22 via these elastic body adapters 20 and 42 are all at different positions in the vertical direction (FIG. 1, FIG. 2 vertical). The inner surface of the cable introduction hole 24 is filled with a sealing material (not shown) for sealing the outer surface 25 of the elastic body adapter 20. A gas valve 43 is provided above the end face portion 23, and a ground terminal 44 is provided below the gas valve 43.

FIG. 6 shows the grip fitting 35. In the figure, the grip fitting 35 is provided on one side portion (left side in FIG. 6) of the I-shaped grip fitting body 45 in which the optical cable 21 introduced into the closure 22 from the elastic adapter 42 is fixed to the connecting rod 36. The two gripping mechanisms provided on the other side (right side of FIG. 6) of the grip fitting body 45, which are gripped and fixed between the pair of onime movable bodies 46, and which are introduced through the elastic adapter 20. It is configured to be gripped and fixed by 47. Each gripping mechanism 47 includes an optical cable 21 between an onime plate 48 projecting from the central portion of the grasping metal body 45 to the other side and an onime movable body 49 approaching and separating from the onime plate 48. Is designed to be gripped and fixed.
The optical cable 21 gripped and fixed to the grip fitting 35 can be released by moving the demon movable bodies 46 and 49.

The operation and effect of this embodiment will be described below. The elastic adapter 20 has a structure in which the optical cable 21 is put into and taken out of the cable hole 26 by passing through the slit 27.
Since the axis line of is shifted from the central axis line of the cable hole 26, it is possible to work only by deforming the elastic body adapter 20 only in the vicinity of the cable hole 26 to be worked. That is, in order to open the slit 27 for allowing the optical cable 21 to pass through the slit 27, the portion from the portion facing the slit 27 through the corresponding cable hole 26 of the elastic adapter 20 to the slit 27 is deformed. By doing so, the other cable hole 26 of the elastic body adapter 20 can be obtained.
The slit 27 can be opened and closed without deforming the side portion, and the work can be performed without affecting the existing optical cable 21 by vibration or the like. Therefore, the work for the target optical cable 21 is the same as the existing optical cable 21.
Can be efficiently performed without affecting communication even when the line is live.

Further, the elastic body adapter 20 includes the sleeve 3
When the cable 4 is fastened, the cable hole 26 is sealed by pressure contact with the optical cable 21 inserted into the cable hole 26. At this time, since the axis line of the slit 27 is displaced from the central axis line of the cable hole 26, the compressive force acting in the vicinity of the cable hole 26 of the elastic body adapter 20 acts in the direction in which the slit opening 32 closes, and the cable hole 26 Can be efficiently sealed. When the blocking plug 28 is fitted into the vacant cable hole 26 and the elastic body adapter 20 is tightened, the sealing material in the vicinity of the slit opening 32 may flow toward the inner surface of the cable hole 26 due to the protrusion 31. Since it is prevented, the cable hole 26 can be reliably sealed. When the flow of the sealing material is prevented, the sealing material does not adhere to the blocking plug 28, and the workability when pulling out the blocking plug 28 from the cable hole 26 is improved.

Further, since the optical cables 21 introduced into the closure 22 are all located at different positions in the vertical direction, the grip fixing position of the optical cable 21 by the grip fitting 35 and the fixing position of the tension member 37 by the tension member fixing fitting 38 are different. Since each optical cable 21 is displaced in the vertical direction, it is possible to perform the work of fixing and releasing the fixing of the optical cable 21 in the grip fitting 35 and the tension member fixing fitting 38 without interfering with other optical cables 21, and the workability is improved. , Existing optical cable 2
Since there is no need to release the fixation of 1 or bend it to avoid work interference, work can be performed without affecting communication even in a live state.

A second embodiment of the cable introducing hole sealing member of the present invention will be described below with reference to FIGS. 7 to 9. Figure 7
In, the elastic body adapter 50 is formed in a substantially cylindrical shape made of the same material as the elastic body adapter 20 described in the first embodiment, and has a cylindrical outer peripheral surface 51 and the outer peripheral surface 5.
Three cable holes 52 penetrating in parallel with the axis of 1,
It has a slit 53 penetrating from each of these cable holes 52 to the outer peripheral surface 51. Ribs 54 are provided at both ends of the outer peripheral surface 51 in the axial direction so as to project a resistance force against the cable introduction hole 24 from the end surface portion 23.
The axis of each slit 53 is displaced from the axis of the cable hole 52, and is open to one side of the elastic body adapter 50 in parallel with each other.

In FIG. 8, the elastic adapter 50 is attached to the end face portion 23.
The state where it is fitted in the cable introduction hole 24 is shown. The elastic body adapter 50 is fitted in a direction in which the cable holes 52 are arranged in a direction perpendicular to the arrangement plane of the cable introduction holes 24, as shown by a chain line in the figure. FIG. 9 shows a grip fitting 55 for gripping and fixing the sheath portion of the optical cable 21 introduced into the closure. The grip fitting 55 has an I-shaped grip tool body 56 fixed to the connecting rod 36, and holds the optical cable 52 introduced through an elastic body adapter 57 having only one cable hole 52. It is gripped and fixed between a pair of onime movable bodies 58 provided on one side portion (left side in FIG. 8) of 56,
A total of three optical cables 21 introduced via the elastic adapter 50 are gripped and fixed by a total of three gripping mechanisms 59, 60, 61 provided on the other side of the gripping tool body 56. The demon eye movable body 58 is screwed into a pair of flange portions 62 projecting from one side of the grip tool main body 56, respectively, and is arranged so as to face each other. Then, it can be gripped and fixed.

In the vicinity of the pair of flanges 63 projecting to the other side of the grip body 56, the first and second grip mechanisms 5 are provided.
9, 60 are provided. The first and second gripping mechanisms 59 and 60 are provided with the optical cable 21 between the demon eye movable body 64 screwed to the flange portion 63 and the demon eye plate 66 fixed to the web 65 of the grasping tool body 56. Is configured to be gripped and fixed. The third gripping mechanism 61 has a web 65.
The optical cable 21 is provided between the demon eye movable body 68 screwed to the tip of the support body 67 projecting from the central portion of the support body to the other side portion and the demon eye plate 69 fixed to the center portion of the support body 67. It is designed to be gripped and fixed. A clearance is provided between the support 67 and the demon plate 66 on the lower side (lower side in FIG. 8) of such a degree that the optical cable 21 gripped and fixed to the third gripping mechanism 61 can pass through.

These first to third gripping mechanisms 59, 6
0 and 61 are provided so as to be shifted in the vertical direction (vertical direction in FIG. 8 and FIG. 9), and as shown in FIG. 9, the third gripping mechanism 61 includes the first and second gripping mechanisms 59 and 60. The optical cable 21 gripped and fixed by the third gripping mechanism 61 is gripped by the first and second gripping mechanisms 59, 60 and these, because the optical cable 21 is displaced in the direction of the central portion (right side in the drawing) of the closure. It can be put in and taken out at a desired installation position without interfering with the fixed existing optical cable 21. In addition, these gripping mechanisms 59, 6
The tension member 37 exposed at the end of the optical cable 21 gripped and fixed by 0 and 61 is fixed by a fixing plate 71 which is detachably screwed to the tension member fixing bracket 70 fixed to the connecting rod 36 at three positions in the vertical direction. Each is fixed. Since the mounting positions of these fixing plates 71 are shifted in the vertical direction, it is possible to efficiently attach and detach the tension member 37 on any of the fixing plates 71 without interfering with other fixing plates 71 and the like. Note that these first to third gripping mechanisms 5
The work performed on 9, 60, 61 and the tension member fixing bracket 70 is performed by the optical cable 2 on one side of the holding tool main body 56.
It goes without saying that the interference with 1 can be avoided.

The operation and effect of the elastic body adapter 50 of this embodiment will be described below. According to the elastic body adapter 50, by sequentially inserting the optical cables 21 into the cable holes 52, it is possible to efficiently add the optical cables 21 without affecting the existing optical cables 21 such as vibration. . That is, the elastic body adapter 50
The optical cable 21 that is introduced into the closure via the cable is sequentially inserted from the cable hole 52 at one end arranged in the elastic body adapter 50 into the cable hole 52 at the other end to be added. For example, in FIG. 8, the first optical cable 21 is inserted into the lowest cable hole 52, and the second optical cable 21 is inserted into the central cable hole 52. Two
The insertion work of the optical cable 21 after the first is performed by the slit 53 which is opened in the intended cable hole 52 of the elastic body adapter 50.
Since the upper portion is deformed by opening the slit 53, the existing optical cable 21 of the elastic body adapter 50 is deformed.
There is no deformation in the vicinity of the cable hole 52 into which is inserted. By doing so, a large number of optical cables 21 can be provided without affecting the existing optical cables 21 by vibration or the like.
Can be introduced sequentially into the closure.

Further, the slit 5 associated with each cable hole 52
Since 3 is formed so as not to pass through the central axis of the cable hole 52, the compressive force acting on the elastic body adapter 50 at the time of sealing again acts in the direction in which the slit 53 is closed even if the opening / closing operation is performed. Therefore, the optical cable 21 can be put in and taken out of the cable hole 52 many times, and moreover, a good sealed state can be always maintained. In addition, since each slit 53 extends in the same direction perpendicular to the plane of the arrangement of the cable holes 52, it is convenient when the work of adding a plurality of optical cables 21 is continuously performed.

When the optical cable 21 is to be taken out from the central cable hole 52, one of the upper and lower existing optical cables 21 is once taken out, and then the central optical cable 21 is taken out. That is, when the lowermost optical cable 21 in FIG. 8 is removed in advance, the central optical cable 21 is removed after the lowermost optical cable 21,
Return the bottommost optical cable 21. When the lowermost optical cable 21 is inserted into or removed from the cable hole 52, only the lower part of the elastic body adapter 50 is deformed to open or close the slit 53, so that the other optical cable 21 vibrates. It is possible to proceed with the work without affecting the above. Further, in the work of taking out the optical cable 21 at the center, the slit 53 is deformed so that only the portion below the slit 53 related to the cable hole 52 at the center of the elastic body adapter 50 is opened. At this time, since the deformation of the elastic body adapter 50 is completed after the lowermost optical cable 21 is taken out, it is not necessary to consider the influence on the lowermost optical cable 21, and the work can be efficiently performed. Further, since the uppermost optical cable 21 is still held at the fixed position, it is not affected by these operations at all. Even in the holding metal fitting 55 and the tension member fixing metal fitting 70, the optical cable 21 inserted into the central cable hole 52 can be taken out without affecting other optical cables 21, so that the existing optical cable 2 can be used.
The communication of 1 can be maintained reliably.

The elastic body adapter may have four or more cable holes. Further, the cable introduction hole sealing member of the present invention can be applied to a plurality of cable introduction holes opened on the same end face portion. In this case, the arrangement direction of the cable holes of each cable introduction hole sealing member is perpendicular to the arrangement plane of the cable introduction holes. The cable introducing hole sealing member of the present invention is the optical cable 2
Other than 1, it is possible to apply to cable introduction holes formed in various structures such as closures for metal cables.

[0033]

As described above, according to the first aspect of the invention, since the axis of the slit is displaced from the axis of the cable hole, only the vicinity of the corresponding cable hole of the cable introducing hole sealing member is provided. Simply by deforming, without affecting the cables inserted in other cable holes such as vibration,
The work of putting the cable in and out of the target cable hole can be efficiently performed. Further, when a compressive force acts on the elastic body adapter, the compressive force acts in the direction of closing the slit near the cable hole, so that the cable hole can be reliably sealed, which is an excellent effect.

According to the second aspect of the present invention, the arrangement direction of the plurality of cables inserted into the cable hole of the cable introduction hole sealing member does not coincide with the arrangement plane of the cable introduction holes, so that the cables in each cable hole are aligned. Since it is possible to avoid the work of taking in and out of the cable from interfering with an existing cable or a component for gripping and fixing the cable, there is an excellent effect that workability of taking in and out of the cable is improved.

According to the third aspect of the present invention, the projection of the closing plug that closes the cable hole closes the opening of the slit that opens on the inner surface of the cable hole, and presses the sealing material near the slit opening. By preventing the flow, it is possible to obtain an excellent effect that the efficiency of the work of extracting the blocking plug from the cable hole in the subsequent step is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a closure to which an elastic adapter according to a first embodiment of the present invention is applied.

2 is a side view showing the closure of FIG. 1. FIG.

FIG. 3 is a perspective view showing an elastic body adapter according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a closing plug that closes a cable hole of the elastic adapter of FIG.

5 is a perspective view showing the action of the obstruction plug of FIG. 4. FIG.

FIG. 6 is a side sectional view showing a grip fitting applied to the closure of FIG.

FIG. 7 is a perspective view showing an elastic body adapter according to a second embodiment of the present invention.

8 is a side sectional view showing a grip of a closure to which the elastic adapter of FIG. 7 is applied.

FIG. 9 is an enlarged front view of a main part showing a holding metal fitting and a tension member fixing metal fitting of a closure to which the elastic adapter of FIG. 7 is applied.

FIG. 10 is a view showing an elastic body adapter of a conventional example, and is a perspective view showing an elastic body adapter of a split type.

FIG. 11 is a view showing an elastic body adapter of a conventional example, which is an elastic body adapter having a slit.

FIG. 12 is a view showing an elastic body adapter of a conventional example, and is a front view showing an elastic body adapter having three or more cable holes.

13 is a front view showing a fixture for gripping and fixing an optical cable inserted into a cable hole of the elastic adapter of FIG.

FIG. 14 is a diagram showing a problem to be solved by the present invention, and is a front view showing an example in which a total of three or more optical cables are introduced from a plurality of cable introduction holes.

FIG. 15 is a view showing a problem to be solved by the present invention, and is a perspective view showing a closing plug for closing a cable hole of a conventional elastic body adapter.

[Explanation of symbols]

20 ... Cable introduction hole sealing member (elastic adapter), 2
DESCRIPTION OF SYMBOLS 1 ... Cable (optical cable), 22 ... Cable connection box (closure), 24 ... Cable introduction hole, 25 ... Outer peripheral surface, 26 ... Cable hole, 27 ... Slit, 28 ... Block plug, 31 ... Projection (projection), 32 ... Opening part, 50 ... Cable introduction hole sealing member (elastic body adapter), 51 ... Outer peripheral surface,
52 ... Cable hole base end, 53 ... Slit.

Claims (3)

[Claims] 1. A cable introducing hole by being interposed between an inner surface of a cable introducing hole (24) formed in a cable connection box (22) and the like and an outer peripheral surface of a cable (21) inserted in the cable introducing hole. Outer peripheral surface (25, 51) of the cable introduction hole sealing member (20, 50) for sealing the watertight or airtight
And a cable hole (26, 52) penetrating in parallel with the axis of the cable introducing hole, and a slit (27, 53) penetrating from the cable hole to the outer peripheral surface so that the cable can be taken in and out of the cable hole. ) And the axis of the slit is displaced from the axis of the cable hole. 2. The cable introduction hole sealing member according to claim 1, wherein the cable introduction hole sealing member has a plurality of cable holes, and the cable holes are arranged on a same plane with respect to an arrangement plane of the cable introduction holes. And a cable introducing hole sealing member, which is arranged in a substantially vertical direction. 3. The cable introduction hole sealing member according to claim 1 or 2, further comprising a blocking plug (28) to be inserted into a cable hole into which a cable is not inserted, and a slit is provided on a side portion of the blocking plug. A cable introducing hole sealing member comprising: an opening (32) that opens into a cable hole; and a protrusion (31) that abuts an inner surface of the cable hole around the opening to close the opening.