JPH0590826U - Electric wire connection protection sheet - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the butyl rubber 11A from escaping from the overlapping portion of the protective sheet. [Structure] In a protective sheet for a wire connecting portion in which a butyl rubber layer 11A is laminated on a surface of an insulating sheet 11B, a plurality of protrusions 13 projecting from the butyl rubber layer 11A are provided in a portion of the wire connecting portion excluding a mounting portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a protective sheet that protects a wire connecting portion for the purpose of waterproofing and insulation.

[0002]

[Prior Art]

 There are various methods for protecting the wire connection part, and among them, as shown in FIG. 6, a viscoelastic insulating material 1A having self-bonding property such as butyl rubber is laminated on the surface of the insulating sheet 1B. 6A to 6C, the protective sheet 1 is folded in two and sandwiches the wire connecting portion 2 or is wrapped around the wire connecting portion to cover the wire connecting portion from the outside. There are some (see Japanese Utility Model Publication No. 62-149226, Japanese Utility Model Publication No. 57-64072, etc.).

Further, in order to improve the filling property, there is also one in which the electric wire connecting portion is covered with the protective sheet 1 as described above and then pressed by the press 3 as shown in FIG. 573, etc.).

As another method, as shown in FIG. 9, an insulating sheet 4 having a protrusion 4A for maintaining a gap with an electric wire connecting portion on an inner surface side and a peripheral frame 4B for sealing is used, As shown in FIG. 10, there is also a method in which the electric wire connecting portion 2 is sandwiched by folding it in two and the curable resin 5 is injected into the sealed space secured in the insulating sheet 4 to be solidified.

[0005]

[Problems to be solved by the device]

 By the way, the former technique mentioned above has a problem that the viscous insulating material 1A oozes out from the end portion of the protective sheet 1 as shown in FIG. 8 when an external force is applied by a press or the like. If it leaks out, it may cause problems such as fusion with the surroundings and contamination, and may also impair the insulation and waterproof performance due to a decrease in the filling property inside.

Further, in the latter technique, since the curable resin is poured after the electric wire connecting portion is sandwiched by folding it in two, the work is troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a protective sheet that can prevent the viscous insulating material from leaching out and is easy to construct.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a protective sheet for a wire connecting portion, which is formed by laminating a viscoelastic material layer having self-bonding property on the surface of an insulating sheet, in a portion excluding the mounting portion of the wire connecting portion. A plurality of protrusions protruding from the viscoelastic material layer are provided.

[0009]

[Action]

 Since the protective sheet of the present invention is provided with the protrusion protruding from the viscoelastic material layer at the edge, the protrusion serves to maintain the gap between the overlapping portions when the protrusion is folded in two. Therefore, even when an external force is applied, the gap between the overlapping portions is not extremely narrowed, and the protrusion of the viscoelastic material is suppressed. Further, the protrusions serve as obstacles, and also from this point, the protrusion of the viscoelastic material from the inside can be suppressed. Further, since the protrusions bite into the mating viscoelastic material layer when they are superposed, the joining force at the mating portion is strengthened.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a state in which an electric wire connecting portion 2 is placed on a protective sheet 11 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.

The protective sheet 11 is formed by laminating a self-fusing butyl rubber (viscoelastic material) layer 11 A on the surface of an insulating sheet 11 B having higher rigidity, and the surface of the insulating sheet 11 B is A large number of cylindrical protrusions 12 and 13 are integrally provided at intervals.

The height T3 of the protrusion 12 at the central portion in the width direction of the protective sheet 11 is set to be the same as or slightly lower than the thickness T1 of the butyl rubber layer 11A, and the height T2 of the protrusion 13 at both edge portions is butyl rubber. The thickness T1 of the layer 11A is set to about twice the thickness T1 or slightly lower than the thickness T1, and the protrusions 13 at both end edges project from the surface of the butyl rubber layer 11A.

Further, the protrusions 13 on both edge portions are arranged so as to be inserted between the protrusions 13 when the protective sheet 11 is folded in two and the both edge portions are overlapped with each other. There is.

Next, the operation will be described.

When this protective sheet 11 is used, the electric wire connecting portion 2 is placed in the center of the protective sheet 11 as shown in FIG. 1, and the electric wire W is positioned along the longitudinal direction of the protective sheet 11. After the determination, as shown in FIGS. 3 and 4, the protective sheet 11 is folded in two in the width direction to sandwich the electric wire connecting portion 2, and the edge portions of the protective sheet 11 are overlapped with each other. Then, an appropriate pressure is applied to cause a compressive force to act on the butyl rubber layer 11A in the protective sheet 11, and the butyl rubber is filled around the electric wire connecting portion 2. At the same time, the edges of the protective sheet 11 are pressed against each other and fused together.

At this time, since the edge portion of the protective sheet 11 has the protrusion 13 protruding from the surface of the butyl rubber layer 11A, this serves as a stopper (return bar) and the gap between the overlapping portions is extremely narrowed. Prevent. Therefore, the protrusion of the butyl rubber 11A in this portion is suppressed. Further, since these protrusions 13 also serve as obstacles that prevent the outflow of the butyl rubber 11A, the protrusion of the butyl rubber 11A is suppressed also from this point. Furthermore, since the protrusions 13 bite into the butyl rubber layer 11A on the other side when they are superposed, the binding force at the superposed portions is strengthened.

Further, since the protection sheet 11 of this embodiment also has the protrusion 12 embedded in the central portion of the protection sheet 11, the protrusion 12 holds the wire connecting portion 2 in place. Therefore, the filler (butyl rubber 11A) is evenly provided around the wire connection portion 2, and a high-quality insulating and waterproof structure can be made.

Next, the effectiveness of the protective sheet 11 of the present invention will be described.

5A, 5B, and 5C are protective sheets shown for comparison with the protective sheet 11 of the embodiment of the present invention.

In the figure, 21 is an insulating sheet, 22 is a butyl rubber layer laminated on the surface thereof, and 23 is a protrusion formed on the surface side of the insulating sheet 21. Examining each protective sheet, (a) When all the protrusions 23 project from the surface of the butyl rubber layer 22, the butyl rubber 22 is less likely to contact the wire connection portion. Therefore, the filling property and the fusion property of the butyl rubber 22 around the electric wire connecting portion are deteriorated.

(B) When all the protrusions 23 are submerged in the butyl rubber layer 22, the problem of the protrusion of the butyl rubber 22 due to the external pressure will occur as in the conventional case.

(C) When all the protrusions 23 are set at the same height as the surface of the butyl rubber layer 22, the butyl rubber 22 does not protrude, and the butyl rubber 22 is attached to the wire connecting portion, but The adhesive strength of the mating part will be insufficient.

From the above, according to the protective sheet 11 of the embodiment of the present invention described above, the protrusion 13 protruding from the surface of the butyl rubber layer 11A is provided in the portion of the wire connecting portion excluding the mounting portion. It is possible to solve all the problems of the filling property and the fusion bondability of the butyl rubber 11A to the electric wire connection portion, the problem of the protrusion, and the problem of the adhesive force, and it is possible to exhibit sufficient effectiveness.

In the above embodiment, the protrusion 12 for holding the wire connecting portion is also provided in the center, but this may be omitted.

Further, in the above embodiment, butyl rubber was used as the viscoelastic material, but other materials may of course be used, and any material may be used as long as it has insulation, elasticity and fluidity. Is also good.

[0027]

[Effect of the device]

 As described above, according to the protective sheet of the present invention, it is possible to solve the problem of leaching out of the viscoelastic material, and to eliminate the possibility of fusion to the surrounding area, the risk of contamination, and the deterioration of insulation and waterproof performance. can do. Moreover, since it is not the type in which the filling material is injected later, the work is extremely easy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a wire connecting portion is placed on a protective sheet according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an external perspective view showing a usage state of a protective sheet according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a protection sheet according to an embodiment of the present invention in use.

FIG. 5 is a cross-sectional view of each comparative example for explaining the effectiveness of the protective sheet according to the embodiment of the present invention.

FIG. 6 is a perspective view showing a process of protecting a wire connecting portion with a conventional protection sheet.

FIG. 7 is a perspective view for explaining a pressing step in the case where the electric wire connecting portion is protected by a conventional protective sheet.

FIG. 8 is a perspective view showing a problem in the case where the electric wire connecting portion is protected by a conventional protective sheet.

FIG. 9 is a perspective view of a conventional protective sheet.

FIG. 10 is a perspective view showing a state in which the electric wire connecting portion is being protected using the conventional protective sheet shown in FIG.

[Explanation of symbols]

11 Protective Sheet 11A Butyl Rubber (Viscoelastic Material), Butyl Rubber Layer (Viscoelastic Material Layer) 11B Insulating Sheet 13 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A viscoelastic material layer having a self-bonding viscoelastic material layer laminated on the surface of an insulating sheet, wherein the viscoelastic material layer is provided on a portion of the electric wire connecting portion other than the mounting portion. A protective sheet for an electric wire connecting portion, which is provided with a plurality of protrusions protruding further.