JPH0130841Y2 - - Google Patents

Description

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

Conventionally, a heat-shrinkable sheet for cable connections as shown in FIG. 1 has been used to protect and prevent corrosion of cable connections. This heat-shrinkable sheet for cable connection (hereinafter simply referred to as heat-shrinkable sheet)
Ribs 2,
2 is formed protrudingly, and a heat-sealing layer 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 layers facing each other, sandwiching both sides with a plurality of clips 4, 4, etc., and shrinking them by heating.

However, during heat shrinkage, as the sheet body 1 softens, the tips of the clips 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 shrinks. There was a risk that the scratches caused by the clips 4 biting in due to the tension at the time would spread and the heat-shrinkable sheet would be damaged.

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 etc. from digging into both sides of the sheet body 1, and also to make the joints of both sides adhere with uniform force, improving the adhesive strength of the joints after heat fusion. This is what I was trying 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 aims to provide a heat-shrinkable sheet that can easily cover the cable connection parts even when the cable connection parts have a difference in outer diameter. .

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

4 to 9 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 which has heat shrinkability mainly in the width direction. At the same time, a heat sealing layer (not shown) is provided on the other surface. On the opposing surfaces 2a, 2a of the pair of ribs 2, 2, a large number of protrusions 7 protruding in the opposing direction are provided at intervals in the longitudinal direction of the ribs 2, 2 (see Fig. 5). .
The protrusion 7 includes, for example, a short cylindrical base 8 having one end fixed to the opposing surface 2a, and a flange integrally provided at the other end of the base 8 and having an outer diameter larger than the outer diameter of the base 8. The elastic deformation of this collar portion 9 causes the projection 7 to engage with a slit 11 of a clip receiving member 10, which will be described later.

The sheet body 1 is made of, for example, crosslinked and stretched polyethylene, the ribs 2, 2 and the protrusions 7 are made of, for example, crosslinked polyethylene, and the heat sealing layer is made of, for example, uncrosslinked and unstretched polyethylene. polyethylene layer or ethylene
It is formed from an adhesive whose main component is vinyl acetate copolymer or the like.

On the other hand, gutter-shaped (U-shaped in cross section) clip receiving members 10 are attached to the projections 7. The clip receiving member 10 is made of, for example, a heat-resistant and rigid metal, and has a large number of slits 11 that are engaged with the projections 7.
It is composed of an inner plate part 12 having a curved part 13 located close to one surface of the seat body 1, and an outer plate part 14 facing the inner plate part 12 via the curved part 13. (See Figure 6).
The slits 11 are perpendicular to the longitudinal direction of the clip receiving member 10 and are provided at intervals corresponding to the positions of the projections, and the tips of the slits 11 extend to the curved portion 13. Further, the width of this slit 11 is formed to be slightly smaller than the outer diameter of the flange portion 9 of the projection 7.

Since such a clip receiving member 10 has a large number of slits 11 provided in the inner plate part 12 and the curved part 13, it is difficult to bend in the direction parallel to the plate surface of the outer plate part 14, and the outer plate part 14 It has the property of being relatively easy to bend in the thickness direction.

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

First, a heat-shrinkable sheet is wrapped so as to cover the connecting portion of the cable 3, and the inner surfaces (heat-sealing layers) of both sides of the heat-shrinkable sheet are made to face each other (see FIG. 7).
Next, the curved portion 13 of the clip receiving member 10,
13 with a plurality of clips 4, etc. At this time, due to the property that the clip receiving member 10 is difficult to bend in a direction parallel to the plate surface of the outer plate portion 14,
Since the pressing force of the clip 4 acts to be uniform in the longitudinal direction of the clip receiving member 10, the seams A on the inner surfaces of both sides of the heat-shrinkable sheet are reliably brought into close contact (see FIG. 8).

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 members 10, 10 have a thickness of the outer plate part 14 so as to follow the movement of the cable connection part toward the center due to contraction of the heat-shrinkable sheet. It easily deforms in the horizontal direction (see Figure 9). Further, at this time, since the pressing force of the clip 4 is distributed in the longitudinal direction of the clip receiving members 10, 10, the clip 4 does not dig into both sides of the sheet body 1 due to softening of the sheet body 1.

After the heat shrinkage is completed, the clip receiving member 1 is
0 and 10 from the heat-shrinkable sheet, it is sufficient to pull the clip receiving members 10 and 10 in the direction in which the slit 11 separates from the protrusion 7.

If the protrusions 7 are given heat shrinkability in the axial direction of the protrusions 7 in advance, the protrusions 7 will contract while the heat-shrinkable sheet is heated, and the engagement with the slits 11 will be naturally released. Therefore, the clip receiving members 10, 1
0 can be easily removed by simply removing the clips 4. Furthermore, in the above embodiment,
Although the protrusions 7 are uniformly provided on the entire opposing surfaces 2a, 2a of the ribs 2, 2, they are not provided in the range where the clip receiving member 10 needs to be bent, as shown in FIG. It may be provided only in a linear range.

Furthermore, the clip receiving member may include a plurality of engagement holes provided in the inner plate portion to engage with the projections, and a slit extending to the curved portion provided in the outer plate portion.

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

Even if there is a difference in the outer diameter of the cable connection, if 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 due to the shrinkage of the heat-shrinkable sheet. The heat-shrinkable sheet is plastically deformed in accordance with the heat-shrinkable sheet, and at the same time works to bring the joints on both sides of the heat-shrinkable sheet into close contact, thereby improving the adhesive strength of the joints.

Since the slit provided on the clip receiving member engages with the protrusion provided on the opposing surface of the rib, the effort of aligning the clip receiving member is eliminated, and the clip does not dig into the heat-shrinkable sheet. After the connection operation, the clip receiving member can be easily removed.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is a perspective view explaining its usage, Fig. 3 is a perspective view showing another conventional example, and Figs. 4 to 9 are an embodiment of the present invention. 4 is a perspective view, FIG. 5 is a partially omitted view taken along the line - in FIG. 4, FIG. 6a is a plan view of the clip receiving member, and FIG. Figure a b-
Fig. 7 is a partially omitted perspective view to explain how to use it, Fig. 8 is a view taken along line -b in Fig. 7, and Fig. 9 is a perspective view to explain the operation. It is a perspective view with some parts omitted. DESCRIPTION OF SYMBOLS 1... Seat body, 2... Rib, 2a... Opposing surface, 7... Protrusion, 10... Clip receiving member, 1
1... Slit, 12... Inner plate part, 13... Curved part, 14... Outer plate part.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of ribs 2, 2 on both sides of one side of the sheet body 1, which has heat shrinkability mainly in the width direction.
In the heat-shrinkable sheet for cable connection, in which the opposing surfaces 2a, 2a of the pair of ribs are formed protrudingly and a heat-sealing layer is provided on the other surface.
is provided with a large number of protrusions 7 which protrude in the opposing direction and are spaced apart in the longitudinal direction of the ribs, and a gutter-shaped clip receiving member 10 having heat resistance and rigidity is engaged with the protrusions. Heat-shrinkable sheet. 2. The clip receiving member 10 is comprised of an inner plate part 12 having a large number of slits 11 that are engaged with the projections 7, and an outer plate part 14 facing the inner plate part with a curved part 13 in between. A heat-shrinkable sheet for cable connection according to claim 1 of the utility model registration claim.