JPH11155U - Waterproof cover for wire connection - Google Patents

Abstract

(57) Abstract: In a molded cover having side pieces at both ends of an upper end torsion, and a joining ear at a lower end of each side piece, an elastic seal material is used. Further, the present invention provides a waterproof cover for an electric wire connection portion which can cover the electric wire connection portion without curving the side piece and can guarantee sufficient waterproofness. A side piece (2) is provided on both sides of an upper end part (1),
At least at both ends of the inner surface of each side piece, there is provided an elastic seal material 5 having a stress of 2 kg / cm ² or less against a 25% compressive strain, and a joining ear 3 is provided at a lower end of each side piece. An adhesive layer 4 is provided on the inner surface of the ear.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a cover used for waterproofing a connection portion of an electric wire, and is particularly useful when a connection portion of an overhead electric wire is waterproofed by an indirect hot wire method.

[0002]

[Prior art]

 In the case of waterproofing the wire connection part, a split cover is attached to the wire connection part after attaching a visco-elastic material inside both ends, waterproofing both ends of the cover with visco-elastic material, A device in which the lower end is sealed with an adhesive is known (JP-A-52-109187).

[0003] The waterproof structure using the molded cover is easier to work than a traditional seal-tape winding structure, and the connection portion of an overhead electric wire is waterproofed by an indirect hot wire method. Is advantageous.

In particular, since the cover can be opened and closed by using the upper end portion as a slide, handling is easy from this aspect.

[0005]

[Problems to be solved by the invention]

 However, the viscoelastic material exhibits sealing properties due to fluid filling into the space to be sealed and adhesion to the surface to be sealed. The viscoelastic material protruding from the edge of the molding cover during processing is apt to adhere to the hand, and the work is troublesome from such a surface. Conventionally, it has been known to perform sealing between the electric wire connection box and the electric wire by rubber packing. In this rubber packing, a sealing property is exhibited by elastic pressure contact with a surface to be sealed. No tackiness is required. However, even when rubber is used in place of the viscoelastic material in the waterproofing treatment with the above-mentioned molded cover, even when rubber is used instead of the viscoelastic material, the vertical reaction force from the inside to the outside of the cover at the inside of the cover where the electric wire is located is reduced. Acting, each side piece of the cover bends outwardly in a bent shape, and as a result, a non-compressed portion is formed in the rubber seal material to generate a gap, and it is difficult to ensure a predetermined waterproofness.

An object of the present invention is to provide a molded cover having side pieces at both ends of an upper end portion, and a joining ear at a lower end of each side piece, even if an elastic seal material is used. It is another object of the present invention to provide a waterproof cover for an electric wire connection portion which can cover a wire portion without bending a side piece portion and can guarantee sufficient waterproofness.

[0007]

[Means for Solving the Problems]

The waterproof cover for the electric wire connection part of the present invention has side pieces on both sides of the upper end part, and at least both ends of the inner surface of each side piece have an elasticity of ² kg / cm ² or less against a 25% compressive strain. -Equipped with a sealing material, a joining ear portion is provided at the lower end of each side piece, and an adhesive material layer is provided on the inner surface of each ear portion. Can be a foam.

[0008]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A is a side view showing an embodiment of the present invention, FIG. 1B and FIG. 1C are respectively a cross-sectional view of a roll and a cross section of FIG. It is.

In FIGS. 1 (a) to 1 (c), A is a molded cover made of plastic or rubber, and has side pieces 2 on both sides of an upper end portion 1; An ear 3 is formed at the lower end. Reference numeral 4 denotes an adhesive layer provided on the inner surface of the ear portion 3. Numeral 5 is an elastic seal material provided at both end portions of the inner surface of each side piece portion 2, and has a low elastic modulus having a compressive stress with respect to 25% compressive strain of 2 kg / cm ² or less, preferably 500 g / cm ² or less. Is used. The thickness of the elastic seal material 5 is slightly larger than or substantially equal to the distance between the inner surface of the side piece and the inner surface of the ear.

FIG. 2 shows a state in which the above-mentioned waterproof cover is put on the branch connection portion of the electric wire (W is a trunk line, w is a branch line). 3 is adhered by adhesive layers 4 and 4. The elastic seal material portion 50 between each side piece 2 of the cover and the electric wires W and w is compressed by a large compressive strain due to the adhesion of the ear portions 3 and 3. Since a low elastic modulus material having a compressive stress against a 25% compressive strain of 2 kg / cm ² or less, preferably 500 g / cm ² or less is used, the compressive reaction force can be sufficiently reduced, and each side portion can be reduced. 2 can be prevented well. Therefore, an uncompressed portion of the elastic seal material 5 which is generated when the side piece 2 is bent and deformed (in the figure, an uncompressed portion is easily generated at a portion P where both the seal material and the outer surface of the electric wire come close to each other. ) Can be eliminated and good sealing performance can be guaranteed.

As the elastic seal material 5 having a compressive stress of not more than 2 kg / cm ^{2 with} respect to the 25% compressive strain, a material having excellent weather resistance such as EPDM or silicone is used. It is preferred to use a closed cell foam.

In order to reduce the elastic modulus of the elastic seal material, as shown in FIG. 3 (a) or FIG. 3 (b), a slit 51 (slit width: It is determined according to the outer diameter of the electric wire, but is usually 1 to 20 mm).

In (b) and (c) of FIG. 1, an adhesive layer may be provided on the surface of the elastic seal material 5. In the above-described embodiment, the elastic seal material is provided only at both ends of the inner surface of each side piece of the cover, but the elastic seal material is provided over the entire inner surface of each side piece. You can also. The waterproof cover of the present invention is used for waterproofing the conductor connection part of the electric wire (covered electric wire), for waterproofing the stripped part of the electric wire, and for waterproofing between the electric wire introduction bushing of the transformer and the electric wire. it can.

[0014]

[Effect of the invention]

In the cover for the electric wire connecting portion according to the present invention, an elastic seal material having a stress against a 25% compressive strain of 2 kg / cm ² or less provided at least at both ends of the inner surface of each side portion has a good seal with the electric wire. As a result, a cover that is easy to be generated when the viscoelastic seal material is pressed down from the outer surface is easily sealed when the viscoelastic seal material is used. Adhesive adhesion of the seal material to the hand can be eliminated, and transfer and flow of the seal material during storage and handling of the cover can be eliminated, and the cover can be easily stored and handled.

[0015] Furthermore, since the compression reaction force of the elastic seal material is small, even if the thickness of the side piece is reduced, it is possible to prevent bending deformation of the side piece well and to guarantee a good seal. And the strain of the viscoelastic seal material with respect to the cover load can be reduced, and unlike the case of using a viscoelastic seal material, the distortion does not progress with time. There is no need to take a complicated configuration for fixing the cover.

[Brief description of the drawings]

FIG. 1A is a side view showing an embodiment of the present invention;
FIG. 1B is a cross-sectional view of FIG.
FIG. 3C is a sectional view taken along the line C-A in FIG.

FIG. 2 is a cross-sectional view illustrating a use state of the cover of the present invention.

FIG. 3 is an explanatory view showing a main part of another embodiment different from the above of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hind part 2 Side piece part 3 Ear part 4 Adhesive layer 5 Elastic seal material

Claims (2)

[Utility model registration claims] 1. An elastic seal material having a stress against a 25% compressive strain of 2 kg / cm ² or less on at least both ends of the inner surface of each side piece. A waterproof cover for an electric wire connecting part, wherein a joining ear part is provided at a lower end of each side piece part, and an adhesive layer is provided on an inner surface of the ear part. 2. The waterproof cover according to claim 1, wherein the elastic seal material is a foam.