JPS58224725A - Heat-shrinkable protection cover - Google Patents

Abstract

PURPOSE:To obtain the title protection cover useful for joining the multicore cable which distributes electric wires without a clearance and of a waterproofness, by inserting and coupling the tubular structures in which plural wires can be inserted separately inside the heat-shrinkable tube of which both ends are open. CONSTITUTION:The purpose protection cover is obtained by inserting and coupling the plural tubes 43 composed preferably of a thermoplastic resin (e.g., PE, an ethylene-vinyl acetate copolymer) inside the tube 23 composed of a heat- shrinkable resin (preferably, a crosslinked polyolefine, PVC, polyester, etc.). USE:For example, by attaching said cover to the joint of the conductors 6 of a cable terminal 8 and other electric wires 9 and heat shrinking it said joint is protected without a clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION Heat shrinkable tubes are very convenient and widely used as protective covers for wire objects. For example, as shown in Figure 1, it is used to tightly bind a covered object (a). (2) is a heat shrinkable tube. If waterproofness is particularly required, hot-melt adhesive or pressure-sensitive adhesive (3) may be applied or inserted onto the inner surface of the heat-shrinkable tube (2) as shown in Fig. 2 to seal the covered object. (1) It is possible to provide waterproof protection without any gaps.

Even in this case, if there are three or more covered objects (1) as shown in FIG. 3, a gap will be formed in the center of the covered objects (1), making it difficult to perform waterproofing.

1, 2, and 3, (a) is a cross-sectional view showing the state before contraction, and (b) is a cross-sectional view showing the state after contraction. Of course, it would be possible to manufacture heat-shrinkable tubes with a large number of holes, but it is clear that it would be technically and economically difficult to manufacture a wide variety of such tubes.

The present invention has been made to compensate for this drawback, and its purpose is to make it possible to waterproof a plurality of covered objects, especially a plurality of linear objects, with protective covers that are tightly attached to each of them. .

That is, this purpose can be easily achieved by inserting and fitting into a part or all of the interior of the heat shrinkable tube a structure having separate holes into which a plurality of linear objects can be inserted separately. can. The structure needs to melt when the heat-shrinkable tube is heated and shrink and come into close contact with the covered object.
Preferably made of thermoplastic resin. It is also desirable that the heat shrink tube is non-thermofusible, ie, crosslinked, so that it can withstand the pressure of the molten structure during shrinkage.

In order to make the configuration of the present invention easier to understand, a fourth example is provided.
Figures 5 and 6 are shown. In these figures (a)
(b) shows a cross-sectional view, and (b) shows a vertical cross-sectional view. In the figure (2
■), (22), (23) are heat shrink tubes, (41)
, (4.2), and (43) are structures, and (51) respectively.
, (52), (53). For these structures (41), (42), and (43), extrusion molded products having this cross section may be used, or extrusion chives may be combined. For example, the one shown in FIG. 6 has an inner diameter of 6ffllTl,
Three polyethylene tubes with a wall thickness of 1 mm are inserted and fitted together. The crosslinked polyolefin heat-shrinkable tube is made to have an inner diameter of 9 mm and a wall thickness of 2 mm after complete shrinkage, as shown in Figure 6.

If it is shrunk by heating, it will become as shown in Figure 7.

Next, an example of use of the heat-shrinkable protective cover of the present invention is illustrated in FIG. 8 and subsequent figures. Multicore cables are often connected during electrical wiring work. FIG. 8 shows the terminal portion of an 8-core cable, where (6) is the conductor, (7) is its insulation coating, and (8) is the outer jacket. Connect each conductor to another wire (9
) and the procedure for waterproofing and insulating the connection part is shown below. Figure 9 shows the heat-shrinkable protective cover of the present invention (No. 6).
After passing three electric wires (one not shown) (9) to be connected to the wires (shown in the figure), the conductors are connected, for example, by soldering. Next, when this protective cover is shifted to the connection part (Fig. 10) and heat-shrinked, each electric wire will adhere to each other through the hot melt (polyethylene in this case) layer θO) as shown in Fig. 11, making it waterproof. This completes the protection of the connection where there is. Cross sections A and A' in Figure 11
is as shown in Figure 12.

The crosslinked heat-shrinkable cheese used in the present invention includes, for example, crosslinked polyolefin, crosslinked PVC, crosslinked polyester, and crosslinked polyvinylidene fluoride. The structure is made of polyethylene, EVA (ethylene vinyl acetate copolymer), EE
A (ethylene ethyl acrylate copolymer), PVCe
Which thermoplastic resin is it?

[Brief explanation of drawings]

Figures 1, 2, and 3 are cross-sectional views showing a state in which a conventional heat-shrinkable protective cover is inserted into a covered object. In these figures, (a) is the state before shrinkage, and (b) is the state before shrinkage. The state after contraction is shown. Figures 4, 5, and 6 show examples of the heat-shrinkable protective cup of the present invention. In these figures, (a) is a cross-sectional view, and (b) is a longitudinal cross-sectional view. Each is shown below. FIG. 7 is a cross-sectional view (A) and a vertical cross-sectional view (B) of the heat-shrinkable protective cover of FIG. 6 which is heat-shrinked as is. FIGS. 8 to 11 are explanatory diagrams showing examples of use of the present invention. (Old covered object, (2), (21), (22), (
23) Heat-shrinkable tube, (8) Hot-melt adhesive or adhesive, (41), (42), (+
3)・Structures, (51), (52), (53)...
Hole, (6)・Conductor, (7)・Insulating coating, (8) External jacket, (9)...Connected 7i'1Figure 7I'2Figure 73Figure 4Figure 16Figure 77Figure 78Figure Figure 9 Figure 10 Figure 11 Figure 712 Procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Application No. 108958 2. Name of the invention Heat-shrinkable storage cover 3. Person making the amendment Sumitomo Denki Kogyo Co., Ltd. Jρ 5, date of amendment order September 28, 1980 6, column 7 of brief explanation of the drawings of the letter of specification subject to amendment, contents of Okegawa (1) Mei letter of specification, line 5, line 13 After -1, insert the text ``Figure 12 is a cross-sectional view at points A and A' in Figure 11.

Claims (3)

[Claims] (1) Heat shrinkage formed by inserting a structure having separate holes into which two or more linear objects can be inserted separately into a part or whole of a heat shrinkable tube that is open at both ends. sexual protection cover. (2) The heat-shrinkable protective cover according to claim (1), wherein the heat-shrinkable tube is crosslinked. (3) The structure is made of thermoplastic resin.
The heat-shrinkable protective cover described in section 1).