JPS63299707A - Method of coating cable branch connection and branch spacer used therefor - Google Patents

Abstract

PURPOSE:To seal hermetically with certainty without having any residual gap by depositing a heat-shrinkable coating, which is contracted in a state of melting of the resin flakes placed between the branch cables, over the branch cables and the thermal contractible coating. CONSTITUTION:Hot-melt resin flakes 22 a branch spacer 20 are placed between the plural number of branch cables 5 taken out in parallel from a branch connection 4. In this state, when the whole of the heat-shrinkable coating 6 and a heated section 29 of a thermal induction board 23 located at the outside of the branch cables from the opening end are heated, its heat is induced to the thermal induction board 23 to melt hot-melt resin flakes 22. At this time, the vicinity of the opening end of the heat-shrinkable coating 6 is also contracted, and the hot-melt resin flakes 22 are drifted transforming freely by contracting force of the heat-shrinkable coating 6 to be able to closely fill between the branch cables 5 and their perimeters.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a method of hermetically covering branch connections of electric cables and communication cables with a heat-shrinkable coating, and a method of covering branch connections of electrical cables and communication cables with a heat-shrinkable coating, and a method of covering branch connections between branch cables. This relates to a branch spacer that seals the spacer.

"Prior Art" Generally, when a cable connection portion is hermetically covered, a heat-shrinkable sleeve or a wrap-around type heat-shrinkable sheet (hereinafter referred to as a heat-shrinkable covering) is used. The heat-shrinkable coating has an outer layer that has heat-shrinkability and an inner layer that has heat-sealing properties, and is placed over the connection portion of the cable and heated to bring it into close contact with the connection portion. It can be covered airtight. In this case, if the connection part is a branch connection part, special measures are required to seal the gap created between the open end of the heat-shrinkable coating and the branch cable.

Conventionally, therefore, a lip as shown in FIG. 17, for example, has been used in the branch portion. This clip 1 is a bifurcated heat-resistant member having a pair of clamping parts 2 facing each other and a U-shaped connecting part 3 connecting these parts, and as shown in FIGS. A heat-shrinkable coating 6 wrapped around a plurality of branch cables 5 branched out in the same direction from the connection part 4 is attached so as to be sandwiched from the outside above the open end, and the open end is heated from the outside ζ By doing so, the inner surfaces of the heat-shrinkable coating 6 are thermally fused together to ensure airtightness of the branch connection portion 4.

``Problems to be Solved by the Invention'' However, since the lip I is attached to it and covers a part of the outer surface of the heat-shrinkable coating 6, it is practically impossible to attach it during heating. In addition, a gap G as shown in FIG. 19 tends to remain between the heat-shrinkable sheathing 6, which is constricted in the shape of a so-called gourd, and the branch cable 5. The tendency for this gap to occur increases as the clip l deviates from the line connecting the centers of the branch cables 5 indicated by the chain line X.

Therefore, when attaching the clip l, care must be taken to ensure that the position of the clip l does not deviate from the predetermined position (a position known from experience). Parts had to be heated particularly intensively.

However, when the constriction of the heat-shrinkable sheathing 6 becomes large, that is, when the heat-shrinkable sheathing 6 is partially bent with an extremely small curvature, cracks are likely to occur in that part.
Moreover, if the heating is too high, there is a problem that the heat-shrinkable coating 6 may be thermally deteriorated.

Another conventional example made in consideration of the above problems is shown in FIG. In this figure, parts common to those in FIGS. 17 to 19 are given the same reference numerals.

That is, numeral 10 is a spacer, and this spacer 1
0 is inserted into the heat-shrinkable sheath 6 with the branch cables 5 supported by curved recesses 11-11 provided at both ends thereof. Also, spacer lO
Inside is a heating means (for example, a heating element such as nichrome wire) 12
is buried, and the heat of the heating means 12 is transferred to the spacer lO
The heat-shrinkable coating 6 can be heated and contracted from the inside by transmitting the heat to the inside.

When the above spacer IO is used, a gourd-shaped constriction as shown in FIG. 19 does not occur, and
Since the heat-shrinkable sheathing 6 is heated uniformly from the inside and outside, it is possible to prevent the occurrence of cracks or thermal deterioration in the heat-shrinkable sheathing 6, but on the other hand, there are the following problems. be.

In other words, in order for the spacer 10 to exhibit a predetermined shape-maintaining function, a certain volume is required, and furthermore, since an active heat generating means such as a nichrome wire is built inside the spacer 10, the entire connection part is As shown in Figure 17-1
There are problems in that the cable connection part is larger and more expensive than the cable connection part shown in FIG. 9, and it is necessary to prepare a power source for operating the heat generating means.

The present invention was proposed in view of the above circumstances, and is capable of preventing gaps from remaining and ensuring reliable sealing, as well as preventing damage to the heat-shrinkable coating. It is an object of the present invention to provide a method of covering a cable connection part that can be implemented in a structural component, and a spacer applied thereto.

"Means for Solving the Problems" In order to achieve such an objective, the coating method of the present invention includes:
A piece of resin having at least heat-melting properties is interposed between the branch cables in contact with each branch cable, and a plurality of heat conductive plates are inserted into the resin piece along the length of the branch cable. The ends of the branch cable are exposed so as to protrude on both sides of the branch cable, and the resin piece and the branch cable are covered with a heat-shrinkable coating except for the exposed part of the heat conductive plate. The exposed portion of the heat conductive plate and the surface of the heat-shrinkable coating are heated, and the branch spacer used in this coating method is
It has a resin piece interposed between the branch cables, and an exposed part that is inserted into the resin piece and projects from the open end to both sides of the branch cable when the resin piece is covered with a heat-shrinkable coating. The device is characterized in that it has a plurality of heat conductive plates, and the exposed portion of the heat conductive plates is used as the heated portion.

"Function" In the present invention, by heating the exposed portion of the heat conductive plate from the outside in the same way as the heat-shrinkable coating, the heat is quickly conducted through the heat conductive plate and is interposed between the branch cables. The heat is transmitted to the resin piece, and the entire resin piece can be uniformly heated and melted to be fused to the heat-shrinkable coating and the branch cable so as to fill the space between them.

"Example" The present invention will be explained in detail below.

First, a first embodiment of the branch spacer used in the coating method of the present invention will be described based on FIGS. 1 to 5. As shown in FIG. It has a structure in which two spacer plates 21 are stacked,
Each spacer plate 2I consists of a heat-fusible resin piece 22 made of polyamide resin, polyolefin resin, etc. and having an almost rectangular parallelepiped shape as a whole, and a heat conduction plate 23 made of a material with excellent thermal conductivity such as copper or aluminum. It is composed of.

Then, as shown in FIG. 3, the cable branch connection section 4
Both resin pieces 22 are interposed between two branch cables 5 drawn out parallel to each other.

Incidentally, the surface heat-fusible resin piece 22 naturally has heat-melt properties, but in the present invention, it is possible to exert the predetermined function by using a material that has at least heat-melt properties. It is something that can be done.

As shown in FIG. 2, the heat conduction plate 23 includes a plate-shaped insertion portion 24 inserted into the heat-fusible resin piece 22, and a heat-fusible resin piece connected to the insertion portion 24. 22, and a plurality of slits 26 are formed in the insertion part 24 so as to pass through the insertion part 24 in the thickness direction. Further, the width of the insertion portion 24 is approximately the same as or slightly larger than the outer diameter of the branch cable 5, and
The width of the exposed portion 25 is much larger than that of the inserted portion 24, and the exposed portion 25 has a T-shape as a whole.

Further, the heat-fusible resin piece 22 is attached to the insertion portion 2 of the heat conductive plate 23.
It can be provided integrally with the insertion portion 24 so as to cover the insertion portion 4. When this heat-fusible resin piece 22 is provided in the insertion part 24 of the heat conductive plate 23, the heat-fusible resin piece 22 is integrally molded into the insertion part 24, or the heat-fusible resin piece 22 is shaped into a tube. The end of the insertion portion 24 is closed with the heat-fusible resin piece 22 by molding it into a shape, placing it over the insertion portion 24, and melting and closing the tip if necessary. During such molding, the resin enters the slit 26 of the insertion portion 24, thereby integrally fixing it to the heat conduction plate 23. Note that a heat conductive plate 2 is attached to this heat-fusible resin piece 22 in advance.
A cavity may be provided to receive the insertion portion 24 of No. 3, and the insertion portion 24 may be inserted into the cavity. The heat-fusible resin piece 22 is formed to have a width larger than the outer diameter of the branch cable 5 by covering the insertion portion 24 of the heat conduction plate 23. Further, the heat-sealable resin piece 22 has a volume that is large enough to densely fill the gap between the heat-shrinkable coating and the branch cable when melted.

As shown in FIG. 1, in the branch spacer 20 made of two stacked spacer plates 21, the heat-fusible resin pieces 22 are linearly fixed to each other at the center in the width direction, and They are mutually curved with a radius of curvature larger than the outer diameter of the branch cable 5 in the direction opposite to the fixed portion 27 . Further, at the end of the curved outer circumferential surface of the exposed portion 25 of the heat conductive plate 23, a temperature detecting portion 2 is provided using a temperature-indicating paint or the like that changes color at the melting temperature (for example, 200° C.) of the heat-fusible resin piece 22.
8 is provided, and the vicinity of the temperature detection section 28 functions as a heated section 29 as described later.

Next, a case will be described in which the branch connection portion 4 of the cable is covered using such a branch spacer 20.

First, as shown in FIG. 3, the heat-fusible resin piece 22 of the branch spacer 20 shown in FIG. The heat-fusible resin piece 22 and the heat conductive plate 2 are interposed between
The branch cables 5 are brought into contact with the concave portions of the branch cables 3 and 3, and the branch cables 5 are tied together with a pressure tape T made of polyvinyl chloride or the like before and after the branch spacer 20.

In the state shown in FIG. 3, most of the outer side of the branch cable 5 is surrounded by the exposed portion 25 of the curved heat conductive plate 23 of the branch spacer 20. At this time, each heat conductive plate 2
The exposed portion 25 of No. 3 may be wrapped around the branch cable 5. Then, the heat-fusible resin piece 22, the branch cable 5, and the branch connection part 4 are integrally covered with a heat-shrinkable coating 6. In the illustrated example, the heat-shrinkable coating 6 is in the form of a sheet, and reference numeral C in the figure indicates a clip that holds the seam of the sheet together. Note that this clip becomes unnecessary if a seamless tube-like piece is used instead of the sheet-like heat-shrinkable covering 6.

Next, the entire heat-shrinkable coating 6 and the heated portion 29 of the heat conductive plate 23 located outside the branch cable 5 from this open end, that is, the outer peripheral surface of the exposed portion 25, are heated using a torch lamp, a gas burner, or the like. Then, the heat is transferred to the heat conduction plate 23
The heat-fusible resin piece 22 is quickly transferred from the insertion portion 24.
The heat is transmitted throughout and melts the heat-fusible resin piece 22.

At this time, the vicinity of the open end of the heat-shrinkable coating 6 also contracts due to heating from the outside, and the contraction force causes both branch cables 5 to approach each other, and the melted resin constituting the heat-fusible resin piece 22 is pressed from above and below and on both sides by the contraction force of the heat-shrinkable sheathing 6, and is caused to flow while freely deforming within the gap between the branch cable 5 and the heat-shrinkable sheathing 6. That is, as shown in FIG.
The gap between the heat-shrinkable coating 6 and the heat-shrinkable coating 6 is tightly filled.

In this case, as shown in FIG. 4, since a part of the outer side of the branch cable 5 is covered by the curved heat-fusible resin piece 22, the heat-shrinkable sheathing 6 shrinks as shown by the chain line. Along the way, both sides of the heat-fusible resin piece 22 entered the corner of the gap formed between the outer surface of the branch cable 5 and the heat-shrinkable coating 6 (the part indicated by A in FIG. 4). This will ensure that every corner of the gap is filled and sealed.

In this way, the melt of the heat-fusible resin piece 22 is integrally fused to the branch cable 5 and the heat-shrinkable coating 6,
The open end of the heat-shrinkable covering 6 can be sealed. In addition, in this series of operations, when heating the heat conduction plate 23 with a torch lamp or the like, most of the outer side of the branch cable 5 is surrounded by the exposed portion 25 of the curved heat conduction plate 23. In addition, since the outer circumferential surface of the exposed portion 25 is used as the heated portion 29, the exposed portion 25 blocks the flame of a torch lamp or the like from reaching the surface of the branch cable 5. The jacket can be protected from overheating, and the heated part 29 can also be protected from overheating.
The appropriate heating temperature for the heat-fusible resin piece 22 can be easily determined by visually observing the temperature detection section 28 and checking for discoloration. Note that the heat-shrinkable covering 6 in the portion other than the open end is heated from the outside to be shrunk at an appropriate time, such as after the heating operation of the exposed portion 25 of the heat conductive plate 23 is performed.

Therefore, according to such a coating method, the branch cable 5 and the heat-shrinkable sheathing can be bonded by simply heating the exposed portion 25 of the heat-conducting plate 23 from the outside in the same way as shrinking the heat-shrinkable sheathing 6. 6 and a heat-fusible resin piece 22
The open end of the heat-shrinkable coating 6 can be reliably sealed. Moreover, since the outer surface of the heat-shrinkable coating 6 is maintained flat or oval-shaped without being constricted, the occurrence of cracks and the like is reduced. In addition, as shown in FIGS. 1 and 2, the heat conductive plate 2
If the end of the insertion part 24 in 3 is covered and closed with the heat-fusible resin piece 22, even if corrosion occurs in the exposed part 25 over a long period of time, it will not reach the inside of the branch connection part 4. There will be no progress.

On the other hand, FIG. 6 shows a second embodiment of the branch spacer of the present invention, and in this branch spacer 3o, the heat-fusible resin piece 3I is thicker on both sides than in the center,
The thick portion 32 is formed to protrude from the opposite surface side of the clearly fused resin piece 3I. By adopting such a shape, a relatively large gap formed on both sides between the branch cable 5 and the heat-shrinkable coating 6 can be efficiently sealed by the thick portion 32. - Also, FIG. 7 shows a third embodiment of the branch spacer of the present invention. In the branch spacer 20 of the first embodiment and the branch spacer 30 of the second embodiment described so far,
Although the plate-shaped heat-fusible resin pieces 22 are used, in the branch spacer 40 of this third embodiment, the heat-fusible resin piece 41 is block-shaped, and recesses 4 are formed on both sides of the heat-fusible resin piece 41.
1a and 41b are formed respectively. Further, the branch spacer 40 of this third embodiment is interposed between two branch cables having different outer diameters, and each of the four parts 41a and 41b has the same outer diameter as the respective branch cables. The two heat conductive plates 23A and 23 are formed to have a radius of curvature and are inserted into the heat-fusible resin piece 4I.
The exposed portions 25A and 25B in B are formed with different width dimensions.

Then, with each branch cable in contact with the four parts 41a and 41b on both sides of the heat-fusible resin piece 41, one by one,
Both branch cables are surrounded by exposed portions 25A and 25B of each heat conductive plate 23A and 23B. By configuring the heat-fusible resin piece 41 in a block shape in this way, the heat-fusible resin piece 41 can be formed in advance in the same shape as the gap between each branch cable, and the melted resin piece 41 can be formed in advance. Sometimes, by slightly fluid deforming, the gap can be filled tightly and the working time can be further reduced.

8 to 11 show a fourth embodiment of the present invention.

The spacer plates 50 (members used as a branch spacer when assembled in pairs) in this embodiment have an 'r-shape as a whole, as in the previous embodiments, and the insertion portions 24 of the heat conductive plates 23 are bonded by heat fusion. It has a structure in which it is inserted into a plastic piece 22 (or simply heat-meltable). Further, the width dimension d of the heat-fusible resin piece 22 is determined by the tangent lines 51 and 51 that connect the branch cables 5 and 5 to be connected to each other (see Figure 1O).
is set larger than the interval between.

When performing branch connection work using the spacer plate 50 having such a configuration, first, as shown in FIG. 9 and FIG. The insertion portion 24 is disposed between the branch cables 5 (range on the right side of the position indicated by arrow A in FIG. 9), and the heat conductive plate 2-3 is made to protrude from the range to be covered. In this case, the heat conductive plate 23 is connected to the branch cable 5
・It can be installed in a curved state surrounding 5. Further, the width of the heat-melting resin piece 22 is the tangent line 51.
Since the interval is larger than the interval of 51, the branch cable 5.5,
A first
A space as shown by reference numeral 52 in the O diagram is generated.

Next, when the connection part prepared in this way is heated with a gas torch or the like, the insertion part 24 The resin constituting the cable melts and becomes freely deformable, and as shown in FIG. Then, the space 52 is densely filled with this hot molten resin. The filled heat-fusible resin is then fused to the inner surface of the heat-shrinkable coating 6, and becomes a spacer indicated by reference numeral 53 in FIG.

In addition, the exposed portions 2 are wound around the branch cables 5 and 5, respectively.
5 blocks radiant heat from a heat source such as a gas torch and protects the branch cables 5 near the connection portions.

Although the spacer 53 formed as described above has a simple structure without built-in active heating means, it exhibits a function similar to the spacer IO in the conventional example shown in FIG. The cables 5.5 are held in a predetermined relative position.

12 to 16 show a fifth embodiment of the present invention.

The spacer plate 60 applied to this fifth embodiment is
As shown in the figure, like the other embodiments, it is composed of a heat-fusible (or simply heat-fusible) resin piece 61 and a heat conduction plate 62, and the heat conduction plate 62 is The insertion part 63 inserted into the adhesive resin piece 61 and the heat-fusible resin piece 61
an exposed portion 64 protruding from the
It consists of 5.

The insertion part 63 is formed wider than the connecting part 65 as shown in the figure, and has a large number of holes 6 passing through it in the thickness direction.
It is equipped with 6. These holes 66 have the same function as the slots in the first embodiment, and strengthen the mechanical connection between the heat-sealing resin piece 61 and the heat conduction plate 62.

The center portion (indicated by the reference numeral 67 in the figure) of the sheet-shaped hot-melt resin piece 6I has a thin wall portion 68 formed in at least a portion (in the case of the drawing, the center portion) and a thick wall portion 69 occupying the other portion.
It is composed of. Further, side edge portions 70 having the same thickness as the thin portion 68 are integrally provided on both sides of the central portion 67. Then, the thin surface portion 68 and the side edge portion 7
The thickness of the insertion portion 63 of the heat conduction plate 62 is set to such an extent that it can reliably cover the insertion portion 63 of the heat conduction plate 62.

Note that since the side edge portions 70 are far from the heat conduction plate 62, the upper limit of temperature tends to lag behind the center portion 67. Therefore, the side edge portions 70 are made thinner so that the temperature rises without delaying the center portion 67, and the portions are softened and melted. It is formed. On the other hand, the central part 6
The thin wall portion 68 provided at 7 is provided in order to balance the volume of the space to be filled with the volume of the heat-fusible resin forming the central portion 67 .

Furthermore, a flexible sheet 71 is embedded in the heat-fusible resin piece 61 so as to sandwich the insertion portion 63 from both sides and parallel to the insertion portion 6 .

This flexible sheet 71 is, for example, a metal net or
It is made of a material with high thermal conductivity and flexibility, such as aluminum foil, and is provided over almost the entire central portion 67. Note that the range in which the flexible sheet 71 is provided is as follows:
In order to promote heat conduction to the entire heat-fusible resin piece 61,
It may extend not only to the central portion 67 but also to the side edges 70 on both sides thereof.

The spacer plate 60 configured as described above is obtained by bending the exposed portion 64 of the heat conductive plate 62, wrapping it around the outer periphery of the branch cables 5, and heat-sealing it. It is used with the flexible resin piece CI inserted between the branch cables 5.

In the example shown in FIG. 14, the spacer plate 60 is
In the stacked state, the upper and lower spacer plates 60 are wound around the upper and lower branch cables 5, respectively. Such a use is primarily applied to large branch connections, ie where the diameter of the branched cable is large and therefore the space between the branch cable and the heat-shrinkable sheath is large. That is, the spacer plate 60 provided at the center is provided to ensure a sufficient volume of heat-fusible resin to fill the space, and the spacer plate 60 is provided to ensure a sufficient volume of heat-fusible resin to fill the space. Replenish the space. Therefore, a larger number of spacer plates 60 may be used depending on the size of the space, but the spacer plates 60 to be deformed to be wound around the branch cables 5.
0 is only for the upper and lower two sheets.

14 and 15, the heat-shrinkable sheathing 6 shrinks as in the other embodiments, and the heat-sealed Sexy resin piece 6! The heat-shrinkable coating 6 is melted and filled into the space within the heat-shrinkable coating 6, thereby forming a spacer 72 as shown in FIG. Furthermore, the surface heat-fusible resin piece 61 quickly reaches the upper temperature limit 1 from the center to the periphery due to the heat transferred via the heat conductive sheet 71 provided inside. Also, the heat conductive sheet 71
is a molten heat-fusible resin piece 61 from the heat-shrinkable coating 6
It is deformed by the contraction force applied to it and becomes the state shown in FIG. Note that, if the heat conductive sheet 71 is made of a metal net, for example, the thermal conductivity becomes better as the wire diameter increases and the wire density increases, and in the case of metal foil, the heat conductivity becomes better as the wire thickness increases. Since flexibility tends to decrease, it is desirable to have a shape that can have high thermal conductivity as long as the deformation of the heat-fusible resin piece 61 is not hindered.

"Modified Embodiment of the Invention" For the a0 branch spacer, the heat conductive plate may be formed separately from the heat-fusible resin piece, and the a0 branch spacer may be inserted into the heat-fusible resin piece during the covering operation.

b. When sealing between three branch cables, the number of heat-fusible resin pieces in the form of a plate shall be three so that each branch cable comes into contact with the block. The number of pieces of heat-fusible resin may be set as appropriate depending on the number of branch cables, such as three four-piece pieces.

C0 In the case where a plurality of plate-shaped spacer plates each having a heat-fusible resin piece are provided, it is optional whether or not they are bonded to each other to be integrated.

"Effects of the Invention" As explained above, according to the present invention, the following effects can be achieved.

(1) Since the heat-shrinkable coating is shrunk while the resin piece interposed between the branch cables is melted and fused to the branch cable and the heat-shrinkable sheath, the heat-shrinkable coating The shrinkage force causes the resin pieces in a hot molten state to flow while being freely deformed, thereby making it possible to densely fill the space between and around the branch cables.

(11) The exposed portion of the heat conductive plate inserted into the resin piece is heated, and the resin piece is melted by the heat conduction, thereby sealing the open end of the heat-shrinkable coating. Similar to the work of shrinking a shrinkable coating, it can be sealed simply by heating from the outside, and is easy to work with.

(iii) Since the resin piece can be easily melted by heating from the exposed part of the heat conduction plate, the heat-shrinkable resin or the cable near the branch connection part is not heated excessively, and damage to it is prevented. can do.

(1v) Since the resin piece is interposed between the branch cables inside the heat-shrinkable sheath, unlike the conventional example, a part of the outer surface of the heat-shrinkable sheath is not covered, so the sheathing is also efficient. It is possible to heat the heat-shrinkable coating, reduce uneven heating, and prevent thermal deterioration caused by excessive heating.Furthermore, the outer surface of the heat-shrinkable coating can be maintained in an approximately oval or flat shape before and after heating. The parts can be reinforced and the occurrence of cracks can be reduced.

(v) By adjusting the number of hot-melt resins inserted between the branch cables, it is easy to increase or decrease the required amount when the size of the space to be filled is changed due to the size of the branch cable's external shape. can correspond to

[Brief explanation of the drawing]

1 to 5 show a first branch spacer according to the present invention.
Fig. 1 is a perspective view showing the external appearance of the branch spacer, Fig. 2 is a partially sectional front view showing one of the spacer plates constituting the branch spacer shown in Fig. 1, and Fig. 3 shows an embodiment. is the first
A perspective view showing the state in which the branch spacer shown in the figure is interposed between the branch cables and covered with a heat-shrinkable coating.
Cross-sectional view near the open end of the heat-shrinkable coating in the figure, No. 5
The figure is a sectional view showing a state in which the heat-fusible resin piece of the branch spacer, the heat-shrinkable coating, and the branch cable are fused together from the state shown in FIG. 4, and FIG. 6 shows a second embodiment of the branch spacer. FIG. 4 is a similar cross-sectional view; FIG. 7 is a perspective view showing the external appearance of the third embodiment of the branch spacer; FIGS. 8 to 11 show the fourth embodiment of the branch spacer; FIG. is a plan view of the branch spacer, Figure 9 is a side view showing how the branch spacer is attached to the branch cable, Figure 1O is a sectional view of the cable connection section before heating, and Figure 11 is the diagram after heating. 12 to 16 show a fifth embodiment of the branch spacer, FIG. 12 is a plan view of the branch spacer, and FIG. 13 is a cross-sectional view of the branch spacer. Figure 14 is a side view showing how the branch spacer is attached to the branch cable, Figures 1 to 5 are cross-sectional views of the cable connection before heating, and Figure 16 is the cable connection after heating. 17 to 19 show examples of cable connection parts using conventional clips, FIG. 17 is a plan view of the clip, FIG. 18 is a perspective view showing the external appearance, and FIG. 19 is a cross-sectional view of the clip. is a cross-sectional view, the second
FIG. 0 is a cross-sectional view showing an example of a cable connection using a conventional spacer. 4... Branch connection part, 5... Branch cable, 6... Heat shrinkable coating, 20/30/40.
...Branch spacer, 21, 50, 60...
Spacer plate, 22, 31, 4I, 6I... Heat fusion resin piece, 23, 23A, 23B... Heat conduction plate, 24, 63... Insertion part, 25・25A・25
B・64...Exposed part, 26...Slit, 27...Fixed part, 28...Temperature/
Testing part, 29... Heated part, 32...
Thick part, 41a/41b... recessed part, 66...
... Hole, 68... Thin wall part, 69...
Thick wall portion, 70... Side edge portion, 71... Heat transfer sheet, 72... Spacer.

Claims (1)

[Scope of Claims] 1. At least a thermomeltable resin piece (
22, 31, 41, 61), and a heat conductive plate (23, 23A, 23B) is inserted into the resin piece along the length direction of the branch cable, and the end of the heat conductive plate is inserted. are exposed so as to protrude on both sides of the branch cable, and the exposed portions of the heat conductive plate (25, 25A, 25
Except for B), after the branch cable and the resin piece are integrally covered with a heat-shrinkable coating (6), the exposed portion of the heat conductive plate and the surface of the heat-shrinkable coating are heated to cause the heat-shrinkable 1. A method of covering a cable branch connection portion, comprising shrinking the heat-shrinkable sheath and melting the resin piece to bring the branch cable and the heat-shrinkable sheath into close contact with each other to seal the space between them. 2. The cable according to claim 1, wherein the heat-shrinkable coating and the exposed portion are heated while the exposed portion of the heat conductive plate is curved so as to cover the outer periphery of the branch cable. How to cover branch connections. 3. The cable branch connection part according to claims 1 and 2, wherein a curved recess is provided on the surface of the resin piece so as to contact a part of the outer periphery of the branch cable. Coating method. 4. A method for covering a branch connection portion of a cable according to any one of claims 1 to 3, characterized in that the resin piece is made of a material having heat-melting and heat-sealing properties. 5. A heat-shrinkable covering (6) is interposed between the plurality of branch cables (5) pulled out from the cable branch connection part (4) in contact with each branch cable, and is integrated with the branch cable. A resin piece (22, 31, 41, 61) having at least heat-melting property to be covered, and a resin piece that is inserted into the resin piece and branches from the open end when the resin piece is covered with a heat-shrinkable coating. The cable includes a plurality of heat conductive plates (23, 23A, 23B) having exposed parts (25, 25A, 25B, 64) that protrude on both sides of the cable and part of which is a heated part (29). Features a branch spacer. 6. The branch spacer according to claim 5, wherein the heat conductive plate is curved so as to cover a part of the outer periphery of the branch cable. 7. The heat conductive plate has a hole (26.
66) is formed. The branch spacer according to claim 5 or 6, characterized in that: 66) is formed. 8. The branch spacer according to any one of claims 5 to 7, wherein the resin piece has a concave portion curved so as to contact a part of the outer periphery of the branch cable. 9. A plurality of the resin pieces are provided so as to be in contact with each branch cable, and one heat conductive plate is attached to each of the resin pieces.
Claim 5 characterized in that the sheets are inserted one by one.
Branch spacer according to items 8 to 8. 10. The resin piece is formed into a block shape into which a plurality of heat conductive plates are inserted, and a plurality of recesses (41a, 41
The branch spacer according to any one of claims 5 to 8, characterized in that b) is formed. 11. The resin piece is characterized in that the thickness of the area near both side parts along the length direction of the branch cable is smaller than the thickness of the area between these parts. Branch spacer according to item 9. 12. Claim 5, wherein an easily deformable sheet made of a material with good thermal conductivity is embedded in the resin piece along a direction substantially parallel to a plane containing the resin piece. 12. The branch spacer according to item 11. 13. The branch spacer according to claims 5 to 12, wherein the exposed portion is provided with a temperature detection portion (28) that changes color at the melting temperature of the resin piece. 14. Claims 5 to 1, wherein the resin piece has both heat meltability and heat fusibility.
Branch spacer according to item 3.