JP4856050B2 - Communication distributor - Google Patents

Description

  The present invention relates to a coaxial cable lead-out type communication distribution device.

  In a base station or relay station for wireless communication such as disaster prevention radio, a multi-stage antenna or multiple antennas are installed on a steel tower, and a signal output from a transmitter is distributed and fed to each antenna by a distribution device. Directionality, for example, omnidirectionality is obtained (see, for example, Patent Document 1). The distribution apparatus also has an action of combining signals received by a plurality of antennas.

  As described above, a distribution device that distributes transmission signals to a plurality of antennas is installed near an antenna provided on a steel tower, and a coaxial cable drawing type is generally used.

  The coaxial cable lead-out type communication distribution device is configured as shown in FIG. FIGS. 5A and 5B show an example in which a signal is divided into two. FIG. 5A is a side view showing a cross-section of the main part, and FIG. 5B is a cross-sectional view taken along line AA in FIG.

  In FIG. 5, 11 is an input / output plug on the synthesis side, and 12a and 12b are input / output plugs on the branch side, which are connected to the two distributors 15 via coaxial cables 13, 14a and 14b, respectively.

  In the two distributors 15, a bottom plate 17 is fixed to the back surface of the base 16 with screws 18, and a ground plate 19 is attached to the top surface of the base 16. The base 16, the bottom plate 17, and the ground plate 19 are provided with through holes 21 for introducing the coaxial cables 13 for input and output, and through holes for introducing the coaxial cables 14a and 14b for branching (see FIG. Not shown).

  The input / output coaxial cable 13 is inserted into a through hole 21 provided in the base 16, the bottom plate 17, and the ground plate 19, and is led out above the ground plate 19. In this case, an O-ring 22 is provided around the coaxial cable 13 for input / output at the bottom of the base 16.

  Similarly, the branching coaxial cables 14 a and 14 b are also inserted into the through holes 21 provided in the base 16, the bottom plate 17, and the ground plate 19, and are led out to the top of the ground plate 19. An O-ring (not shown) is also provided around the coaxial cables 14 a and 14 b for branching on the bottom side of the base 16.

  The coaxial cables 13, 14a, 14b held by the base 16 and the like are arranged at an equal angle, and in this example, are arranged in an equilateral triangle state.

  An insulating base 23 is provided at the front end of the input / output coaxial cable 13 introduced into the two distributor 15, and a printed circuit board 24 is disposed above the insulating base 23. In the input / output coaxial cable 13, the center conductor 26 and the outer conductor 28 are connected to the ground plate 19 and the printed board 24, and details of this connection will be described with reference to FIG. 6.

  FIG. 6 is a cross-sectional view showing details of a connection portion between the coaxial cable 13 for input / output, the ground plate 19 and the printed board 24.

  In the input / output coaxial cable 13, an outer conductor 28 is provided outside the center conductor 26 via an insulator 27, and a jacket 29 is provided outside the outer conductor 28. The input / output coaxial cable 13 has a tip protruding from the front side of the ground plate 19. First, the outer cover 29 is protruded from the ground plate 19 by a predetermined length, and a ring-shaped outer conductor is formed at the front end and the outer side of the outer cover 29. A mounting base 31 is mounted. The outer conductor mounting base 31 is firmly connected by brazing the entire outer periphery (360 °) between the lower outer side and the ground plate 19. Reference numeral 32 denotes the brazing portion.

  Next, the front end of the outer conductor 28 extended a predetermined length forward from the outer conductor mounting base 31 is folded back and positioned outside the outer conductor mounting base 31, and the outer conductor holding ring 33 is placed on the outer side to cover the outer conductor. In addition, the upper end of the outer conductor holding ring 33 and the entire outer periphery of the outer conductor 28 are soldered and firmly connected. Reference numeral 34 denotes this soldering portion.

  A printed circuit board 24 is disposed on the outer conductor 28 located at the tip of the input / output coaxial cable 13 via an insulating base 23. The central conductor 26 of the input / output coaxial cable 13 is led out onto the printed circuit board 24 through a through hole provided in the insulating base 23 and the printed circuit board 24, and the leading end is bent along the printed circuit board 24. The bent portion of the center conductor 26 is soldered to a line on the printed circuit board 24 and electrically connected. Reference numeral 35 denotes this soldering portion.

  Also in the coaxial cables 14 a and 14 b for branching, the central conductor and the outer conductor are connected to the line on the ground plate 19 and the printed circuit board 24 in the same manner as the coaxial cable 13 for input and output.

  Further, as shown in FIG. 5, the lug terminal 36 is fixed to the ground plate 19 with screws 37, and one end of a capacitor 38a (38b) is connected to the lug terminal 36 and grounded. Further, a high frequency coil 39 is provided on the printed circuit board 24, and is connected to the capacitors 38a and 38b, the input / output coaxial cable 13 and the branching coaxial cables 14a and 14b to constitute a two distribution circuit.

A cover 41 that protects the two distribution circuit is fixed to the upper portion of the base 16 with screws 42. In this case, an O-ring 43 is provided at the center of the outer periphery of the base 16.
JP 2005-198185 A

  The conventional communication distribution device configured as described above has a coaxial cable for electrically connecting the coaxial cable 13 for input / output and the coaxial cables 14a and 14b for branching to the printed circuit board 24 and the ground plate 19. 13, 14 a and 14 b need to be processed, and the outer conductor mounting base 31 and the outer conductor holding ring 33 must be manufactured so that the cable can withstand a strong pulling force from the outside. In addition, its assembly, brazing, soldering, etc. are not easy, it requires a lot of processing and assembly time, the appearance of the finished cable base is not excellent, and the quality and reliability are low There was a problem.

  The present invention has been made to solve the above problems, and can use a high-quality and inexpensive member to firmly fix the coaxial cable to the distributor body, brazing the ground plate and soldering the outer conductor. The purpose of the present invention is to provide a communication distribution device with stable quality, which can be assembled in a short time and can withstand strong pulling force and rotational force of the coaxial cable from the outside. To do.

  A first aspect of the present invention is a coaxial cable lead-out type communication distribution device, comprising a shell having a threaded portion provided on the outer side of the distal end, and is attached to the distal end of the coaxial cable and connected to an outer conductor of the coaxial cable. A connection structure having a coaxial connector structure, a case main body having a plurality of structure mounting holes into which the tip of the shell is inserted, and a screw portion at the tip of the shell inserted into the structure mounting hole of the case main body. A fixing nut for fixing the connection structure to the case body, a ground plate interposed between the case body and the fixing nut and held at the tip of the shell, and provided on the case body, A printed circuit board to which the central conductor of the coaxial cable led out from the shell tip is connected, and is disposed on the printed circuit board and connected to the central conductor of the coaxial cable and the printed circuit board. A circuit component that constitutes the distribution circuit, characterized by comprising a cover mounted on the case body.

  According to a second aspect of the present invention, in the communication distribution device according to the first aspect, the connection structure is screwed into a shell, a clamp, a gasket, a washer, and an opening of the shell. It is constituted by a push nut, and an outer conductor of a coaxial cable inserted into the shell is interposed between an inner wall of the shell and a clamp, and the push nut is screwed and fixed through the gasket and a washer. And

  According to a third aspect of the present invention, in the communication distribution device according to the first or second aspect of the invention, the connection structure is provided with a cut surface for preventing rotation at a tip portion of the shell.

  According to the present invention, by attaching the connection structure to the tip of the coaxial cable, the coaxial cable can be easily attached to the case main body of the distributor, and the electrical connection can be reliably performed. In addition, the connection structure may be manufactured by using a shell portion as a connection base for the distributor, and other parts can be assembled by combining standard and high-quality and inexpensive coaxial plug parts that are generally commercially available. Therefore, an inexpensive component configuration with stable quality is sufficient, and the production efficiency can be improved and the delivery time can be shortened. Also, the end processing of the coaxial cable eliminates the need for brazing or soldering of the outer conductor, making it possible to reliably incorporate it into the shell with simple processing, ensuring strong cable pulling force and rotational force from the outside. Can withstand.

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

  1A and 1B show a configuration of a coaxial cable lead-out type communication distribution device according to an embodiment of the present invention. FIG. 1A is a side view showing a cross-section of the main part, and FIG. It is a left view which shows the state which carried out. FIG. 1 shows an example in which a signal is divided into two.

  In FIG. 1, 51 is an input / output plug on the combining side, 52a and 52b are input / output plugs on the branch side, and the distributor 57 is connected via an input / output coaxial cable 53 and branch coaxial cables 54a and 54b, respectively. Connected to.

  In this case, the coaxial cables 53, 54 a, 54 b can be fitted with the connection structure 55, 56 a, 56 b having a coaxial plug structure at the tip, and the connection structure 55, 56 a, 56 b can be attached to the case main body 58 of the distributor 57. Like that.

  As shown in FIG. 2, the connection structure 55 of the coaxial plug structure is composed of a plurality of components. The other connection structures 56a and 56b have the same configuration as that of the connection structure 55, and thus detailed description thereof is omitted.

  FIG. 2 is an exploded view of the components of the connection structure 55, (a) is a side view showing a part of each component, and (b) is a front view of the shell 65 in (a). (C) is a front view of the fixing nut 66 in (a).

  As shown in FIG. 2, the connecting structure 55 includes a push nut 61, a washer 62, a gasket 63, a clamp 64, a shell 65, and a fixing nut 66, and the push nut 61, washer 62, clamp 64, shell 65, and fixing nut A metal is used as 66.

  The push nut 61 includes a flange portion 61a and a male screw portion 61b, and a spanner hanging portion 61c having both side portions cut off is provided on the flange portion 61a.

  The washer 62 has the effect of making the gasket 63 flat.

  The gasket 63 is formed in a ring shape from an elastic member such as synthetic rubber, and has a waterproof action and a holding force against an external pulling force by tightening the outer jacket 74.

  The clamp 64 includes a large-diameter portion 64a having a large inner diameter and a small-diameter portion 64b having a small inner diameter. A flange 64c is formed outside the opening of the large-diameter portion 64a, and the tip is tapered outside the small-diameter portion 64b. A portion 64d is formed. A stepped portion 64e is provided at the boundary between the large diameter portion 64a and the small diameter portion 64b.

  The inner diameter of the large-diameter portion 64a of the push nut 61, the washer 62, the gasket 63, and the clamp 64 is set to a size that allows the coaxial cable 53 to be inserted as shown in FIG. Further, the inner diameter of the small diameter portion 64 b in the clamp 64 is set to a size that allows the outer conductor 73 portion excluding the outer jacket 74 of the coaxial cable 53 to be inserted. That is, when the input / output coaxial cable 53 is inserted into the large diameter portion 64a of the clamp 64, the tip of the outer jacket 74 comes into contact with the stepped portion 64e between the large diameter portion 64a and the small diameter portion 64b and stops. ing.

  The shell 65 is provided with a connecting portion 65b having a smaller diameter and a predetermined length than the shell main body 65a on the distal end side of the shell main body 65a, and an internal thread portion 65c is formed inside the opening of the shell main body 65a. A male screw portion 65d is formed on the outer side. Further, the shell main body 65a is formed with a tapered portion 65e so that the distal end side becomes narrower on the inner back, that is, on the connecting portion 65b side.

  Further, a wrench hanging portion 65f is provided outside the shell main body 65a in the vicinity of the connecting portion 65b. Furthermore, as shown in FIG. 2C, the connecting portion 65b of the shell 65 is provided with a cut surface 65g on both sides and is formed in a substantially oval shape. The cut surface 65g has a function of preventing rotation when the connection structure 55 is attached to the case main body 58 of the distributor 57, and can withstand a cable rotational force from the outside.

  The clamp 65, the gasket 63, and the washer 62 are housed in this order in the shell main body 65a of the shell 65, and then the male screw portion 61b of the push nut 61 is screwed to the female screw portion 65c of the shell main body 65a.

  In the shell 65, the inner diameter of the connecting portion 65b is set such that the insulator 72 portion excluding the outer conductor 73 and the outer jacket 74 of the input / output coaxial cable 53 can be inserted as shown in FIG.

  A fixing nut 66 is screwed onto the male screw portion 65d of the connecting portion 65b. The fixing nut 66 is provided with a spanner hooking portion 66a on both sides.

  As described above, the connection structure 55 has a coaxial plug structure, and the push nut 61, the washer 62, the gasket 63, and the clamp 64 can use standardized coaxial plug parts that have been commercially available. Yes, the shell 65 may be set to a structure and dimensions that match the push nut 61, washer 62, gasket 63, and clamp 64.

  Next, processing when the connection structure 55 configured as described above is attached to the distal end portion of the input / output coaxial cable 53 will be described with reference to FIG. FIG. 3 is a side view showing a partial cross-sectional view of the connection structure 55 attached to the distal end of the input / output coaxial cable 53.

  In the coaxial cable 53 for input / output, an outer conductor 73 is provided outside the center conductor 71 via an insulator 72, and an outer jacket 74 is provided outside the outer conductor 73. The outer conductor 73 has a braided wire configuration using a thin metal wire such as a copper wire.

  When the connection structure 55 is attached to the front end of the input / output coaxial cable 53, the front end of the input / output coaxial cable 53 is processed in advance, and the front end of the center conductor 71 is projected from the insulator 72 by a predetermined length. The tip of the outer conductor 73 is made shorter than the tip of the insulator 72 by a predetermined length. Further, the tip end portion of the outer jacket 74 is made shorter than the tip end of the outer conductor 73 so that the tip end portion of the outer conductor 73 is exposed to the outside by a predetermined length.

  Then, a push nut 61, a washer 62, a gasket 63, a clamp 64, and a shell 65 are inserted in this order into the distal end portion of the input / output coaxial cable 53, and the distal end of the jacket 74 is connected to the large diameter portion 64a in the clamp 64. The tip of the outer conductor 73 is folded back along the outer side of the clamp 64. In this state, the outer conductor 73 and the clamp 64 are inserted into the shell main body 65a of the shell 65, and the gasket 63 and the washer 62 are inserted into the shell main body 65a of the shell 65, and then the push nut 61 is screwed into the shell main body 65a. Wear and fix. That is, the front end folded portion of the outer conductor 73 is sandwiched between the clamp 64 and the shell 65 to ensure the electrical connection between the outer conductor 73 and the shell 65 and to pull out the coaxial cable for input / output from the outside. I will be able to withstand it.

  In the state where the connection structure 55 is attached to the tip of the input / output coaxial cable 53 as described above, the insulator 72 of the input / output coaxial cable 53 is inserted into the connecting portion 65 b of the shell 65, and the tip of the shell 65 is inserted. From the above, the insulator 72 and the center conductor 71 of the coaxial cable 53 for input / output are respectively derived by a predetermined length.

  A tube made of a heat-shrinkable resin may be put on the outside of the joint portion between the input / output coaxial cable 53, the push nut 61 and the shell 65 so as to be waterproof. The tube may be provided as necessary, and may not be used in particular.

  On the other hand, connection structures 56a and 56b configured in the same manner as the connection structure 55 are also attached to the distal ends of the coaxial cables 54a and 54b for branching.

  The coaxial cables 53, 54a, 54b are attached to the case main body 58 of the distributor 57 via the connection structures 55, 56a, 56b as shown in FIG.

  The case body 58 is formed in a cylindrical shape by bending the outer periphery of a circular metal plate downward by a predetermined length. The case body 58 is provided with a structure mounting hole for inserting the connecting portion 65b of the shell 65 constituting the connection structures 55, 56a, 56b. This structure mounting hole is formed in an oval shape in accordance with the external shape of the shell connecting portion 65b, and when the connecting portion 65b is inserted, rotation is prevented by the cut surface 65g of the connecting portion 65b, and the external cable rotation force is prevented. It is a structure that can withstand it reliably.

  Further, the structure mounting holes provided in the case main body 58 are provided at substantially equal angles, and in the case of a two-distributor, the structure mounting holes are set in a triangular position.

  The case body 58 is integrally provided with a wall mounting bracket 59 below the side portion, and a metal cover 60 is press-fitted into the outer peripheral surface from the upper surface side. After the cover 60 is press-fitted into the outer peripheral surface of the case main body 58, the lower end is caulked and fixed to the lower side of the case main body 58 at, for example, three locations at intervals of 120 °.

  Next, processing when the connection structure 55 attached to the input / output coaxial cable 53 is connected to the case main body 58 will be described. When connecting the connecting structure 55 to the case main body 58, a waterproof seal washer 81 is interposed at the tip of the shell 65, that is, the connecting portion 65 b, and the structure of the case main body 58 together with the central conductor 71 and the insulator 72 of the coaxial cable 53. Insert into the mounting hole. Then, a ground plate 83 is inserted into the tip of the shell 65 protruding on the case main body 58 with a plain washer 82 interposed therebetween. The ground plate 83 is provided with three insertion holes corresponding to the structure mounting holes of the case main body 58, and the tip of the shell 65 is inserted into the holes. A fixing nut 66 is screwed into a tip end portion of the shell 65 protruding above the ground plate 83, that is, a connecting portion 65b with a washer 84 interposed therebetween, and is fastened and fixed.

  As described above, the seal washer 81 is interposed at the tip of the shell 65 and inserted into the structure mounting hole of the case main body 58, and the fixed nut 66 is inserted through the plain washer 82, the ground plate 83, and the washer 84 at the insertion tip. The shell 65 can be securely fixed to the case main body 58 and the electrical connection between the case main body 58 and the ground plate 83 can be reliably performed.

  Then, a printed circuit board 85 is disposed on the insulator 72 of the input / output coaxial cable 53 protruding from the tip of the shell 65, and the central conductor 71 is inserted into the through hole provided in the printed circuit board 85. The leading end is bent along the printed circuit board 85, and the bent part is soldered to a line on the printed circuit board 85. As described above, by projecting the insulator 72 of the coaxial cable 53 from the tip of the shell 65 by a predetermined length, the printed circuit board 85 can be incorporated without being short-circuited to the shell 65.

  The coaxial cables 54a and 54b for branching are also attached to the case main body 58 of the distributor 57 via the connection structures 56a and 56b in the same manner as the coaxial cable 53 for input / output, and the central conductor 71 is connected to the printed circuit board. 85 is connected to the track.

  Although not shown, a high-frequency coil and a capacitor are disposed on the printed circuit board 85, and are connected to the input / output coaxial cable 53 and the central conductors of the branching coaxial cables 54a and 54b and the ground plate 83, as shown in FIG. A two distribution circuit as shown is configured. The distributor 57 completes assembly by mounting the cover 60 on the case main body 58 after the arrangement and connection of the components are completed. In this case, the cover 60 is pressure-bonded to the case main body 58 as described above, and further, a plurality of points at the tip are caulked and fixed.

  FIG. 4 shows an example of the above two distribution circuit.

  In FIG. 4, reference numeral 91 denotes an input / output terminal to which an input / output coaxial cable 53 is connected, and a capacitor 92 is provided between the input / output terminal 91 and the ground. The input / output terminal 91 is connected to the distribution terminals 94 a and 94 b through the high-frequency coil 93 and is further grounded through the capacitor 95. Branching coaxial cables 54a and 54b are connected to the distribution terminals 94a and 94b.

  In the above configuration, a transmission signal output from the transmitter, for example, is input to the input / output terminal 91 via the input / output coaxial cable 53. The signal input to the input / output terminal 91 is sent to the distribution terminals 94a and 94b through the high-frequency coil 93, and sent from the distribution terminals 94a and 94b to the antenna power supply unit through the coaxial cables 54a and 54b.

  According to the above embodiment, the coaxial cables 53, 54a, 54b are connected to the distributor 57 by attaching the connecting structures 55, 56a, 56b to the tips of the input / output coaxial cables 53 and the branching coaxial cables 54a, 54b. The case main body 58 can be easily mounted, and electrical connection can be made reliably, and the size and weight can be reduced.

  The connection structures 55, 56a, and 56b may be manufactured by using only the shell 65 as a connection base for the distributor, and other parts are combined with standardized high-quality and inexpensive coaxial plug parts that are generally available on the market. As a result, it is possible to use an inexpensive component structure with stable quality, improve manufacturing efficiency, and shorten delivery time. Also, the end processing of the coaxial cables 53, 54a, and 54b does not require brazing or soldering of the outer conductor 73, so that skill is not required, and it can be incorporated into the shell 65 by simple processing. It is easy to install the distributor at a high place, and can reliably withstand the strong cable pulling force and rotational force from the outside.

  In addition, the connection structure 55 is attached to the case main body 58 of the distributor 57 via, for example, a seal washer 81 and the like, and the cover 60 is press-fitted and fixed to the case main body 58. Rain water can be reliably prevented from entering, and a waterproof structure can be easily obtained without applying O-ring processing or the like to each component.

  In the case of a type that allows some rainwater to enter the distributor 57, the case main body 58 is provided with about 1 to 4 small water drain holes to form a water drain structure, thereby providing a waterproof seal washer. 81 and the like can be eliminated, and the press-fitting error and manufacturing error of the case main body 58 and the cover 60 can be relaxed.

  In addition, although the case where it implemented to 2 distribution apparatus was shown in the said embodiment, it can implement similarly in 3 distribution apparatus, 4 distribution apparatus, ... etc. similarly.

  Moreover, although the case where the two cut surfaces 65f were provided in the connection part 65b of the shell 65 and formed in the oval shape was shown in the said embodiment, even if it provided the one cut surface 65f and formed in the D shape, it has shown. In addition, it is possible to have an anti-rotation action against an external rotational force.

  Further, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the communication distribution apparatus which concerns on one Embodiment of this invention is shown, (a) is a side view which shows a principal part in cross section, (b) is a left view which shows the state which removed the cover. It is a figure which decomposes | disassembles and shows the component of the connection structure in the same embodiment. FIG. 4 is a side view showing a partial cross-section of a state where a connection structure is attached to the distal end portion of the input / output coaxial cable in the same embodiment. It is a circuit block diagram which shows an example of 2 distribution circuit. The structural example of the conventional communication distribution apparatus is shown, (a) is a side view which cuts and shows the principal part, (b) is an AA arrow directional cross-sectional view in (a). It is sectional drawing which shows the detail of the connection part of the coaxial cable of input / output in FIG. 5, a ground board, and a printed circuit board.

Explanation of symbols

  51, 52a, 52b ... Input / output plug, 53 ... Coaxial cable for input / output, 54a, 54b ... Coaxial cable for branching, 55, 56a, 56b ... Connection structure, 57 ... Distributor, 58 ... Case body, 59 ... Wall mounting bracket, 60 ... Cover, 61 ... Push nut, 61a ... Hut part of push nut, 61b ... Male thread part of push nut, 62 ... Washer, 63 ... Gasket, 64 ... Clamp, 64a ... Large diameter part of clamp 64b ... Clamp small diameter part, 64c ... Clamp flange part, 64d ... Clamp taper part, 64e ... Clamp step part, 65 ... Shell, 65a ... Shell body, 65b ... Shell connecting part, 65c ... Shell body Female thread part, 65d ... Male thread part of shell connecting part, 65e ... Tapered part of shell body, 65f ... Spanner hanging part, 65g ... Cut surface, 66 ... Fixing nut, 66a ... Wrench part of constant nut, 71 ... Center conductor of input / output coaxial cable, 72 ... Insulator of coaxial cable for input / output, 73 ... Outer conductor of coaxial cable for input / output, 74 ... Coaxial for input / output Cable jacket, 81 ... Seal washer, 82 ... Plain washer, 83 ... Ground plate, 84 ... Washer, 85 ... Printed circuit board, 91 ... I / O terminal, 92 ... Capacitor, 93 ... High frequency coil, 94a, 94b ... Distribution terminal 95: Capacitor.

Claims (3)

In the coaxial cable lead-out type communication distributor,
A connection structure having a coaxial plug structure that includes a shell provided with a threaded portion on the outer side of the distal end, is attached to the distal end portion of the coaxial cable and is connected to an outer conductor of the coaxial cable, and the distal end portion of the shell is inserted. A case main body having a plurality of structure mounting holes, a fixing nut that is screwed to a screw portion at a tip of a shell inserted into the structure mounting hole of the case main body, and fixes the connection structure to the case main body, and the case A printed circuit board that is interposed between the main body and the fixing nut and is held on the tip of the shell, and a central conductor of the coaxial cable provided on the case main body and led from the tip of the shell A circuit component disposed on the printed circuit board and connected to a central conductor of the coaxial cable and the printed circuit board to form a distribution circuit; and a cover attached to the case body Communication distribution apparatus characterized by comprising a.   The connection structure includes a shell, a clamp housed in the shell, a gasket, a washer, and a push nut screwed into the opening of the shell, and an outer conductor of a coaxial cable inserted into the shell. 2. The communication distribution device according to claim 1, wherein the communication distribution device is interposed between an inner wall of the shell and a clamp, and a push nut is screwed and fixed through the gasket and a washer.   The communication distribution device according to claim 1, wherein the connection structure is provided with a cut surface for preventing rotation at a distal end portion of the shell.

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