JPS5928826A - Device for connecting communication cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin-filled communication cable connection device.

FIG. 1 is a conceptual diagram showing the structure of a conventional underground cable connection device (hereinafter simply referred to as cable connection section C).

In the figure, la and lb are distribution cables, lc is a subscriber pull-up cable (hereinafter simply referred to as a pull-out cable), 2 is a connection case, 3 is a cable core, 4 is a core connection, and 5
7a and 7b are end faces made of rubber. The waterproof resin 5a is applied between the cable cores.
- In order to ensure the water resistance of the pull, it is filled with a polybutene-based mixture, and conventionally, polyurethane has been used as an example.

FIG. 2 is a sectional view of an underground distribution cable to which this type of cable connection C is applied.

The pull-up cable IC has several core wires branched out at the connection point, and is brought out from the throat hole 8 to the ground, into the terminal box 9, and the outdoor line 10a, Lot)', f subscriber 11a.

Telephone 12a, 12bK wiring of 11b is removed. In the cable connection section C, it is necessary to disassemble and reconnect the cable connection section C in order to change the number of branch cores, change the type of cable, etc. in accordance with changes in the expected demand for the number of subscribers. At this time, with the conventional cable connection part C, it is necessary to remove the resin 5aY that has entered the gap between the core wire connections, which takes a long time, and also causes the core wires to be damaged due to excessive force. There was a risk that the line connection portion 4 would be erroneously disconnected. In addition, since the resin 5a that is filled is generally expensive, there is a problem in that the cost increases.In order to eliminate the drawbacks of the conventional method, the present invention provides an upper case and a lower case, and wires the bottom of the lower case. A storage part opening to the outside is provided for storing the tip of the wiring cable or the pulling cable, and the opening is closed with an end face plate with a protruding end portion of the wiring cable or the pulling cable, and the wiring in the storage part is The lower case is made watertight by the upper case by providing a waterproof resin injected around the tip of the cable or the lifting cable, the purpose of which is to facilitate switching and connection work and improve workability. "Toward" Ni,
The goal is to significantly reduce the amount of waterproof resin, reduce costs, and obtain watertightness with a simple configuration.

The present invention will be explained based on the drawings.

FIG. 3 is a partially cutaway exploded perspective view of an embodiment of the communication cable connection device of the present invention, and FIG. 4 is a perspective view of an end plate.

In the figures, the same reference numerals as in FIGS. 1 and 2 indicate the same parts and parts.

13a is a lower case, 13a-1 is a cylindrical part, 14 is an upper case, 5b is a waterproof resin, 7C%7(] is an end plate, 7
C-1, 7d-1 indicates an annular groove.

The configuration of the communication cable connection device of the present invention will be explained.

The lower case 13a has a cylindrical portion 13a-1 formed at both ends of the long axis of the ellipse and serves as a storage portion for storing a wiring cable and a pull-up cable that protrudes downward integrally with the lower case 13a. The end plates 7c, 7dK have holes 7c-a, into which the wiring cables la, lb or pull-up cable IC are drawn.
7 d-bS dimension or 7 (-c is provided, and the inner diameter of the hole is slightly smaller than the outer diameter of each cable in order to obtain watertightness with the distribution cable 1a5 lb and the pulling cable 1c. Upper case 14 is oval,” two-part case 14
The lower case 13a has an oval shape, and the stators 14-1 and 13a-2 each have a plurality of screw holes on the periphery.
will be established. These case materials are made of metal or plastic with a metal film to prevent water from entering due to moisture permeation. Lower case 13ah, J second case 3-4
Between them, the stators 1.4-1.13a-2 are tightened together with screws or the like via gaskets or seals to maintain watertightness.

The order of assembling the communication cable connection device of the present invention will be explained.

Pass the cables 1a, lc, and lb through the end plates 7c and 7d,
Resin 5b is injected into the upper recesses of the end plates 7b and 7d of the lower case 13a-1, and the upper case 14 is replaced with the cylindrical portion 13a-17 of the lower case 13a.
- Cover the bottom part containing the stator 14 1.13a between the upper and lower cases 14.13G through the gasket.
At step 2, the connector is tightened with a screw or the like, and the resin 5b is then hardened to complete the connecting device. If it becomes necessary to switch the core wires after connecting the cables, this can be done simply by removing the top cover.

FIG. 5 shows a second embodiment of the present invention in a developed perspective view.
Left and right lower cases 13b, 13 on the long axis of the G-ellipse
It is divided into c. - Cuts 16a, 16b or 16c' in the center of the blade end plate 7/C17d that communicate with the wiring cable nope pull-up cable 1a%lbt or IC lead-in hole are provided in the end plate 7es7f. A gasket 15 whose front view is T-shaped, where an oval-shaped gasket is provided with straight parts protruding at right angles that are integrally connected to the bottom of both ends of the long sleeve.
Gaskets 15 are interposed between the joint surfaces of the upper and left and right lower cases, and the upper and left and right lower cases are tightened with screws to maintain the interior airtight.

The assembly of the communication cable connection device of the second embodiment is as follows:
Insert the wiring cables la-, 1b or IC into the holes from the notches 16a, 16b, 16C of e, 7f,
Separate lower cases 13b and 13G with T-shaped gasket 1
5 and tighten with screws, etc., and then complete the work by performing the same operations as above.

Since the communication cable connection device of the present invention can configure a core wire connection section without separating the cable, it can be applied to cases such as drawing out branch core wires from the middle of the cable (pulling-through section), changing the number of cable branches, etc. The present invention U, j1 can be applied not only to underground distribution cables but also to some cables including optical cables, in which case,
In order to prevent the filler resin from flowing into the gaps between the cable core wires, it is necessary to seal the cut end of the jacket in advance with a sealing material or early-strengthening resin.

In addition, the present invention has a structure in which the cable is introduced from directly below the connection part in order to accommodate it in the handhole where the underground wiring cable is laid. , a structure in which the cable is introduced from the side of the connection part is preferable. An example of the structure in this case is shown in FIG. 13d is a lower case that has a cable inlet on the side, but a structure in which it is vertically divided into two is also conceivable. The other parts are the same as in Examples 1 and 2.

When a polybutene-based mixture is used as the filling resin for the connecting device of the present invention, it has excellent adhesiveness.
Metal can be used for the case material, plastic can be used for the end plate, and chloroprene rubber can be used for the gasket l-.

When using a polyurethane mixture as the filling resin, in order to bond the resin with other connection materials, use metal or hard vinyl chloride resin for the case material, and use a urethane primer, for example, for the end plate and gasket. Use chloroprene rubber. Cables with a polyethylene sheath have poor adhesion, so for example, one side may be coated with polyethylene and/or a highly adhesive butyl rubber-based adhesive, and the other side may be coated with a polyurethane-based primer. A tape with a three-layer structure is prepared separately and wrapped in advance around the outer sheath of the cable to be installed in the resin.

Since the present invention does not embed the core wire connection portion in the waterproofing resin, the work of switching and connecting the core wires is facilitated and the workability is improved. By arranging the wiring cable and the two ends of the cable in the cylindrical part that is part of the case, and injecting waterproofing resin only into the cylindrical part, it is possible to significantly reduce the use of waterproofing resin and reduce costs. can be lowered. Although the entire inside of the case was not filled with waterproofing resin, the cylindrical part was filled with waterproofing resin to make the end of the cable waterproof.
The inside of the case can be made sufficiently watertight just by providing the t.

Based on the above configuration, the present invention facilitates the work of switching and connecting the core wires and improves the workability. The present invention has the following advantages: it can significantly reduce the amount of waterproofing resin and reduce costs, it can achieve watertightness with a simple structure, and it is suitable for connection devices for subscriber communication cables that are frequently switched and connected.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional underground wiring communication cable connection device, FIG. 2 is a sectional view of an underground wiring cable installation equipped with the underground wiring communication cable connection device of FIG. 1, and FIG. 4 is a perspective view of an end plate of the present invention, FIG. 5 is a developed perspective view of a second embodiment of the present invention, and FIG. 6 is a perspective view of another embodiment of the present invention. Ola showing a perspective view of an example end plate, and Figure 1'7 is a sectional view of a third embodiment of the present invention.
, lb: wiring cable, IC: subscriber cable,
2: Conventional connection part case, 3: Core wire, 4: Core wire connection part,
5a, 5b, 5c, 5d: waterproof resin, 6: resin injection port, 7a, 7b, 7c, 7d: end plate, 8:...end hole, 9: terminal box, 10aslOb: outdoor line, lla, l
lb: subscriber's house, 12a, 12b: telephone, 13a,
13b. 13c, 1'3d: Lower case, 13a-1, 13b-
1, 13C-1: Storage section, 14: 2-part case, 15:
T-shaped gasket, l 6 a, 16 b, 1
6C: Cutting depth, 14-1. 13 a-2, 13b-2
゜13C-2: Stator patent applicant Nippon Telegraph and Telephone Public Corporation agent Patent attorney Isao Abe Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 3.

Claims (1)

[Claims] ``A two-part case and a lower case are provided, and a storage part opening to the outside for storing the distal end of the wiring cable or the pulling cable is provided at the bottom of the lower case, and the opening is the distal end of the distributing cable or the lifting cable. is closed with a protruding end plate, a waterproof resin is injected around the distal end of the distribution cable or the pulling cable in the housing, and the lower case is made watertight with the upper case. connection device.