JPS61266009A - Withdrawal of bonding wire for cable connection - 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 (Field of Industrial Application) The present invention relates to a method for taking out a bond wire of a metal jacket of a cable at a cable connection portion to the outside of a connection case.

(Prior art) Figure 4 shows the state of the bond wire extraction part of the cable metal jacket in a conventional cable connection part, where 1 is the optical cable, 2 is the metal connection case, and 4 is the nitrogen gas for initial airtightness confirmation. A side pressure valve part that allows gas to be filled in, released, and measured the gas pressure inside the cable during work without leaking; 5 is a cable gripping fitting electrically connected to the laminate jacket of the cable; 6 is a rubber The end plate 7 is a rubber tube. Reference numeral 8 denotes a bond wire inside the connection case, one end of which is connected to the cable gripping fitting 5 through a tightening port 11 with a connecting rod 10, and the other end is connected to the inner surface of the metal connection case 2. One end of the bond wire 9 outside the connection case 2 is fixed and connected to the connection case 2 with its tightening bolt 12, and the other end is connected to a metal body of another cable or grounded. As shown in the enlarged view of FIG. 6, the measurement valve part 4 penetrates the connection case 2 while keeping it airtight with an O-ring 18, and is fitted with a nut 16 and a tightening nut 1.
a pedestal 13 attached to the connection case 2 by 7;
An inside valve 14 mounted inside this pedestal 13, which forms the body of the pressure measuring valve part, and a valve cap 15 are the same.

(Problem to be Solved by the Invention) In this way, in order to take out the bond wire of the cable metal jacket to the outside of the connection case, connect the other end of the bond wire 8 inside the case to the inside of the metal connection case 2, and then take it out of the case. One end of the bond 9 is connected to the outside of the connection case 2, so if the connection case 2 is made of plastic, the bond wire cannot be easily taken out as in the case of a metal connection case. Q: It is necessary to provide a bond wire lead-out part with a complicated structure by using IJ ring, etc., and connection case 2
Drilling two holes in the main body requires machining and requires the use of complicated and expensive parts.

In view of the above points, the present invention provides a bond wire extraction method that allows the bond wire to be extracted from the connection case without separately providing an airtight extraction part for the bond wire in the connection case. .

(Embodiment) Fig. 1 shows an embodiment of the present invention, Fig. 2 shows an enlarged view of the main parts thereof, 21 is a plastic connection case body, 22 is a rubber end plate of the connection case, and 24 is an end plate 22. 25 is the laminate jacket of the cable 24, 26 is a cable gripping fitting,
27 is a connecting rod that connects the cable gripping metal fitting 26 and the cable gripping metal fitting on the other side, and 28 is a connecting rod 27 that connects the gripping metal fitting 26 to the other cable gripping metal fitting.
The bolt 29 is a tightening bolt for the connection case 21. Reference numeral 60 denotes a pressure measuring valve part, and a vibro which forms a body of a side pressure valve part is airtightly installed through a hole provided between nozzle-like protrusions 22a provided on the opposing parts of the inner and outer surfaces of the end plate 22 made of rubber. 1, and an inside valve 3 provided by screwing or welding into the outside end of this pipe 31.
2 and the valve cap 36, and the vibro 1
An inner terminal 36 is provided on the inner protrusion of the vibro 1.
An outer terminal 38 is provided on the outer protrusion.

The other end of the bond wire 65 in the connection case is connected to the cable gripping metal fitting 66 electrically connected to the laminate jacket 25 of the cable 24 with the port 28, and the other end of the bond wire 65 is connected to the inner terminal 66, and the other end of the bond wire 65 is connected to the inner terminal 66. The other end of the bond wire 37 outside the connection case, which has one end connected to the outer terminal 38, is connected to an external metal body or grounded. Rubber end plate 2 above
By forming the hole diameter of the nozzle-like protrusion 22a of Nozzle 2 to be smaller than the outer diameter of the vibro 1, a self-sealing effect can be obtained between the vibro 1 and the rubber end plate 22 by passing the pipe 31 through the hole. A highly reliable airtight part is formed. Note that the length of the nozzle-like protrusion provided on the outside of the rubber end plate 22 may be shorter than that of the nozzle-like protrusion provided on the inside. The parts exposed outside the connection case and exposed to standing water in the manhole, such as the pressure measuring tube (lube part 30) (eve 61, valve cap 63), are made of corrosion-resistant metal such as stainless steel (SUS304L) to prevent corrosion. can be eliminated.

FIG. 3 shows the main parts of another embodiment, in which terminals for internal and external bond wires are attached to a side pressure valve section 40 of the same type as the side pressure valve section shown in FIGS. 4 and 6, and a bond wire extraction section is provided. Reference numeral 41 denotes a pedestal, which serves as a cover for the side pressure valve section. 42 is the 0 ring, 46 is the valve cap, 4
4 is an inside valve, 45 is a fixing nut, 47 is a terminal for an external bond wire 46, and 49 is a terminal for an internal bond 48 fixed to the lower surface of the base 41. As in the previous embodiment, the other end of the internal bond wire 48 is connected to a cable gripping fitting, and the other end of the external bond wire is connected to an external metal body or grounded. 50 is a tightening nut.

Pedestal 41, valve cap 46, oak) 45,5Q.

The external bond wire terminals 47 are made of a corrosion-resistant metal as in the previous embodiment.

(Effects of the Invention) As described above, the present invention allows the bond wire to be taken out of the connection case via the pressure measuring valve section.
Even if the connection case body is made of an insulating material such as plastic, there is no need to separately provide a complicated and expensive airtight extraction part because only the bond wire is used.

[Brief Description of the Drawings] Fig. 1 is a partial sectional view of a cable connection section showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the vicinity of the side pressure valve section, and Fig. 5
The figure is a cross-sectional view of the main part of another embodiment, FIG. 4 is a cross-sectional view of the bond wire pull-out part of the conventional cable connection part, and FIG. The enlarged sectional view, FIG. 6, is a sectional view of the pressure measuring valve section. 21...Connection case body, 22...Rubber end plate of connection case, 25...Cable laminate jacket, 2
6... Cable grip fitting, 30.40... Pressure measuring valve part, 35.48... Bond wire inside the connection case, 3
7゜46... Bond wire outside the connection case, 36.49
... Internal bond wire terminal, 38, 47... External bond wire terminal Fig. 1 Broom 2 times Fig. 4 Fig. 5 Certain 5 1θ Broom 60 /J /σ

Claims (1)

[Claims] A method for taking out bond wires from a cable connection part, characterized in that the bond wires from the metal jacket of the cable are taken out of the connection case through a side pressure valve part.