JPH022032Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a heat-shrinkable sheet used to seal interconnections between cables.

In order to protect and prevent corrosion of cable connections, a conventional heat-shrinkable sheet for cable connection as shown in FIG. 1 is used. This heat-shrinkable sheet for cable connection (hereinafter simply referred to as heat-shrinkable sheet) has ribs on both sides of one side of the heat-shrinkable sheet body 1 in the width direction [in the direction of E-L in the figure]. 2, 2 are formed protrudingly, and a heat sealing layer (not shown) is provided on the other surface. For example, as shown in FIG. 2, such a heat-shrinkable sheet is made by covering the connecting portion of the cables 3, 3 with a cylindrical reinforcing member (not shown), which is split into two halves, and wrapping the sheet over the cylindrical reinforcing member (not shown). The cable connection portion is sealed by placing the two ends facing each other, sandwiching both ends with a plurality of clips 4, 4, etc., and shrinking the cable by heating.

However, during heat shrinkage, as the sheet body 1 softens, the tips of the clips 4, 4, etc. bite into both sides of the sheet body 1, causing the clips 4 and the sheet body 1 to weld together, or the sheet body 1 to There was a risk that the damage caused by the clips 4 biting in due to the tension during contraction would spread and damage the heat-shrinkable sheet.

On the other hand, FIG. 3 shows another conventional example in which rod-like members 5, 5 are vertically attached to both sides of a heat-shrinkable sheet, and both sides are held together by clips 4, 4, . . . via the rod-like members 5, 5. etc., to prevent the clips 4 from digging into both sides of the sheet body 1, and also to make the seams of both sides adhere with uniform force, improving the adhesive strength of the seams after heat-sealing. This is what I tried to do.

However, since the rod-shaped members 5, 5 are used as a jig, the applicable range is limited to a portion where the seam is linear. Therefore, in both of these conventional examples, if there is a difference in the outer diameter of the cable connection part, the third
It was necessary to attach auxiliary parts such as auxiliary sleeves 6, 6 shown in the figure in advance.

The present invention was developed in consideration of the above-mentioned circumstances, and the purpose is to provide a heat-shrinkable sheet that can easily cover the cable connection parts even when there is a difference in the outer diameter of the cable connection parts. be.

The present invention will be described below based on embodiments shown in the drawings.

FIGS. 4 to 8 show an embodiment of the present invention, in which a pair of ribs 2, 2 are formed protruding from both sides of one side of a sheet body 1 that is contractible in the width direction. A heat sealing layer (not shown) is provided on the other surface, and on the opposing surfaces of the pair of ribs 2, 2,
Gutter-shaped (U-shaped cross-section) clip receiving members 7, 7 are integrally provided (see FIG. 4).

The sheet body 1 is made of, for example, cross-linked and stretched polyethylene, and the heat-adhesive layer is
For example, it is formed from an adhesive whose main component is ethylene-vinyl acetate copolymer.

On the other hand, the clip receiving member 7 is made of, for example, a metal having heat resistance and rigidity, and includes an inner plate portion 8 bonded to the opposing surfaces of the ribs 2, 2.
A curved portion 9 located close to one surface of the seat body 1, an outer plate portion 10 facing the inner plate portion 8 via the curved portion 9, and a curved portion 9 on the inner plate portion 8 and the curved portion 9 It is composed of a large number of slits 11 which are cut across the clip receiving member 7 at intervals perpendicular to the length direction of the clip receiving member 7 (see FIG. 5).

In addition, in consideration of the case where the clip receiving members 7, 7 are removed after the heat shrinking work is completed, the inner plate portion 8 and the facing surfaces of the ribs 2, 2 are bonded intermittently in the longitudinal direction of the ribs 2, 2. Alternatively, you can simply use adhesive or the like to fix it in place.

Such a clip receiving member 7 has an inner plate portion 8.
Since a large number of slits 11 are formed in the curved portion 9, it has the property that it is difficult to bend in the direction parallel to the plate surface of the outer plate portion 10, but is relatively easy to bend in the thickness direction of the outer plate portion 10. It is something that you have.

Next, a method of using the heat-shrinkable sheet formed as described above will be explained.

First, a heat-shrinkable sheet is wrapped around the connection part of the cable 3. Then, by arranging both ribs 2, 2 along the tangential direction of the cable 3, the heat-sealing layers on the inner surface of the positions on both sides where the ribs 2, 2 protrude are butted against each other (see Fig. 6). , the curved portions 9 of the clip receiving members 7, 7 are held between a plurality of clips 4, etc. In this state, both the clip receiving members 7, 7 have their curved portions 9 facing inward, and the inner plate portion 8 and the outer plate portion 1.
0 is arranged parallel to the tangential direction of the cable 3.
Then, as described above, the clip receiving members 7, 7
is a direction parallel to the plate surface of the outer plate portion 10 (cable 3
Since it is difficult to bend in the tangential direction when attached to the heat-shrinkable sheet, the pressing force of the clip 4 acts to be uniform in the longitudinal direction of the clip receiving member 7, so that the inner surface of both sides of the heat-shrinkable sheet is Seam A will be firmly attached (see Figure 7).

When the heat-shrinkable sheet is then heated, the heat-shrinkable sheet conforms to the shape of the cable connection portion and shrinks until it fits tightly. At this time, if there is a difference in the outer diameter of the cable connection part, the clip receiving member 7 will move in the thickness direction of the outer plate part 10 (in the radial direction of the cable 3 when attached to the cable 3), as described above. Since it is easy to bend, the clip receiving members 7, 7 are attached to the outer plate portion 1 so as to follow the movement of the cable connection portion toward the center due to contraction of the heat-shrinkable sheet.
It is easily deformed in the thickness direction of 0 (see Fig. 8).
Further, since the pressing force of the clip 4 is distributed in the longitudinal direction of the clip receiving members 7, 7, the clip 4 does not dig into both sides of the seat body 1 due to softening of the seat body. Furthermore, the curved portion 9
Since the outer plate part 10 is not bonded to the seat body 1, when the seat body 1 near the seam A contracts in the circumferential direction of the cable connection part, the outer plate part 10 is not bonded to the seat body 1. The slip phenomenon occurs and does not prevent the sheet body 1 from contracting. Further, by heating, the heat sealing layer is fused to the connecting portion of the cable 3, and the heat sealing layers are also fused to each other at the seam A, thereby sealing the inside.

In the above embodiment, the clip receiving member 7
Although the slits 11 are provided uniformly throughout the entire structure, the slits 11 may be provided only in portions that require bending as shown in FIG. Further, in the embodiment, an example in which the clip receiving member 7 is formed to have a U-shaped cross section has been shown, but the shape is not limited to this, and may be, for example, a U-shaped cross section.

As explained above, according to this invention, the following effects can be obtained.

If the cable connection part has a difference in outer diameter and the difference in outer diameter is within the shrinkage capacity of the heat-shrinkable sheet, the clip receiving member will move toward the center of the connection part due to the shrinkage of the heat-shrinkable sheet. While plastically deforming following the movement of the heat-shrinkable sheet, it also works to bring the heat-shrinkable sheet into close contact with both sides of the box, improving the adhesive strength at the seam.

If the difference in the outer diameter of the cable connection part is larger than the shrinkage capacity of the heat-shrinkable sheet, bend the clip receiver member in advance to follow the contour of the cable connection part. If you put a sex sheet between them,
It becomes possible to seal the connection.

Since the clip receiving member is integrally bonded to the rib, there is no need to align the clip receiving member, and the clip does not dig into the heat-shrinkable sheet, improving work efficiency.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional example, Figure 2 is a perspective view explaining how to use it, Figure 3 is a perspective view of another conventional example, and Figures 4 to 8 are an embodiment of the present invention. 4 is a perspective view, FIG. 5a is a plan view of the clip receiving member, and FIG. 5b is taken along line bb of FIG. 5a.
6 is a perspective view with some parts omitted to explain how to use it, FIG. 7 is a view taken along the - line in FIG. 6, and FIG. 8 is a partial view to explain the operation. It is an abbreviated perspective view. DESCRIPTION OF SYMBOLS 1... Seat body, 2... Rib, 7... Clip receiving member, 8... Inner plate part, 9... Curved part, 1
0... Outer plate part, 11... Slit.

Claims (1)

[Claims for Utility Model Registration] A pair of ribs 2, 2 are formed protruding from both sides of one side of a sheet body 1 having heat shrinkability in the width direction, and a heat sealing layer is provided on the other side. , in a heat-shrinkable sheet for cable connection in which the heat-sealing layers at the rib forming position are abutted against each other when wrapped around the connection part of the cable 3, a gutter-like sheet having heat resistance and rigidity is provided on the opposing surfaces of the pair of ribs. Clip receiving members 7, 7 are integrally provided, and the clip receiving member includes an inner plate portion 8 integrally bonded to the opposite surface of the rib, and a curved portion 9 located close to one surface of the sheet main body. and,
It consists of an outer plate part 10 that faces the inner plate part via this curved part, and a plurality of slits 11 are provided in the inner plate part and the curved part, spanning these and orthogonal to the length direction of the clip receiving member. A heat-shrinkable sheet for cable connection, characterized in that the sheets are provided at intervals in the length direction.