JP3224762U - Cap parts - Google Patents

Abstract

The present invention is used for protection or electrical insulation, and is preferably used, for example, for covering a projection such as a terminal or an end of an electric wire. A member for a cap is provided. A cap member (1) is a tube-shaped member having a sealing portion (3) at one end in the axial direction. One opening of the tube portion 2 is sealed, and has a sealing portion 3. [Selection diagram] Fig. 1

Description

  The present invention relates to a cap member which is used for protection or electrical insulation, and is covered with, for example, various terminals and projections such as ends of electric wires.

  Conventionally, cap members of various shapes and materials have been widely used for the purpose of protection, electrical insulation, and the like.

  Patent Literature 1 describes a method of insulating and protecting a terminal by covering a terminal with a terminal protection tube and folding and fixing a tip protruding from the terminal.

  Patent Document 2 discloses that an insulating cap for an electric wire end is formed of an elastic material so as to be able to expand and contract in the radial direction, and a joint portion of a plurality of electric wires is inserted into the outer peripheral portion of the electric wire to form an inner peripheral portion of the insulating cap. A method for elastically adhering surfaces is described.

There has been a concern that the conventional cap member may fall off under the environment in which it is used, for example, under conditions such as high temperature, high humidity, and vibration.
Also, for the purpose of improving productivity, it is desired to easily attach a cap.

JP 2009-176677 A JP 2012-69314 A

  The problem of the present invention is that it is used for protection and electrical insulation, and is suitably used, for example, for covering various terminals and projecting portions such as ends of electric wires. Another object of the present invention is to provide a cap member that is easy to use.

  The gist of the present invention is as follows.

(1) It is made of a tube-shaped member having a sealing portion at one end in the axial direction.
(2) It is preferable that the shape of the sealing portion is substantially rectangular.
(3) In the substantially rectangular sealing portion, the length in the axial direction is preferably 1.0 to 10.0 mm.
(4) It is preferable that at least two tube-shaped members are arranged substantially in parallel and have a structure integrated via a sealing portion.
(5) It is preferable that the shape of the sealing portion in (4) is a substantially rectangular plate shape.
(6) The cap member is preferably made of a heat-shrinkable tube.
(7) The pull-out strength between the cap member and the member to be coated is preferably 3N or more.
(8) The cap member is preferably made of fluororesin.

  The cap member of the present invention has excellent pull-out strength with the member to be covered, has the effect of not easily falling off even under severe use environments, and is easy to mount, so the effect of improving productivity is expected. it can.

Schematic view of an example of the cap member of the present invention (A) (b) Schematic of another example of the cap member of this invention.

  In FIG. 1, 1 is a cap member, 2 is a tube portion, and 3 is a sealing portion.

  The cap member 1 of the present invention is characterized by being formed of a tube-shaped member having a sealing portion at one end in the axial direction.

The cap member 1 has a structure in which one opening of the tube portion 2 is sealed, and has a sealing portion 3.
The method of forming the sealing portion 3 is not particularly limited, and examples thereof include a method of forming a structure having a sealing portion by injection molding in addition to heat fusion or adhesion with an adhesive.

  The shape of the sealing portion 3 is not particularly limited, but is preferably substantially rectangular.

In the case of a substantially rectangular shape, the axial length L of the sealing portion 3 is not particularly limited, but is preferably 1.0 to 10.0 mm.
When the axial length L of the sealing portion 3 is 10.0 mm or less, it is suitable for use in a space-saving manner.
When the length L in the axial direction of the sealing portion 3 is 1.0 mm or more, the sealing portion 3 can be grasped, so that the mounting work on the member to be covered becomes easy. Further, it is possible to prevent the tube portion 2 from being crushed or broken at the time of mounting.
More preferably, the axial length L of the sealing portion 3 is 1.0 to 5.0 mm.
Further, the width W of the sealing portion 3 is not particularly limited, but is preferably 1.0 to 30.0 mm.

FIGS. 2A and 2B are cap members 21 and 31 showing an example of another embodiment of the present invention.
It is preferable that at least two tube portions 22 and 32 of the cap members 21 and 31 are arranged substantially parallel to each other, and are integrated via the sealing portions 23 and 33, respectively.

  The shape of the sealing portions 23 and 33 is not particularly limited, but is preferably a substantially rectangular plate.

The shape in which the tube portions 22 and 32 and the sealing portions 23 and 33 are integrated is not particularly limited.
For example, FIG. 2A shows a structure in which the tube portion 2 is disposed at both ends of the sealing portion 33 in a direction perpendicular to a plate-shaped surface, and FIG. Is a structure arranged on the side surface of the plate shape.
As shown in FIGS. 2A and 2B, in the case of a structure in which the two tube portions 2 are integrated, the number of steps for attaching the cap members 21 and 31 to the member to be covered is reduced, so that work efficiency is improved. Become.

  The lengths X and Y of the sealing portions 23 and 33 in FIGS. 2A and 2B are not particularly limited, and are appropriately determined according to the application.

  The cap members 1, 21, 31 are preferably tubes having heat shrinkability (hereinafter, referred to as heat shrink tubes), and are attached to the member to be coated by heat shrinkage.

The material is not particularly limited, and examples thereof include a thermoplastic resin, a thermoplastic elastomer, a thermosetting resin, and a thermosetting elastomer.
From the viewpoint of heat resistance, slidability, insulation properties, chemical resistance, non-adhesion, weather resistance, flame retardancy, etc., a fluororesin is preferred, and a fusible fluororesin, for example, FEP (tetrafluorofluoride) is most preferred. Ethylene / hexafluoropropylene copolymer), PFA (ethylene tetrafluoride / perfluoroalkoxyethylene copolymer), ETFE (ethylene tetrafluoride / ethylene copolymer) and the like.

The pull-out strength between the cap members 1, 21, 31 and the member to be coated is not particularly limited, but is preferably 3N or more.
In the case of 3N or more, the cap member can be effectively prevented from falling off from the member to be covered even in various use environments, and more preferably 5N or more.

The tube portions 2, 22, and 32 are not particularly limited, but are shown below for reference.
The cross-sectional shape in the radial direction may be appropriately determined according to the object to be coated, but is generally preferably substantially circular from the viewpoint of moldability.
The thickness of the tube portions 2, 22, 32 is not particularly limited, but is preferably, for example, 50 μm to 2.0 mm. It is appropriately determined according to the use of the cap member 1, the inner diameter of the tube portions 2, 22, 32, and the like.

  When the tube portions 2, 22, and 32 are heat-shrinkable tubes, the inner diameter of the tubes before shrinkage is not particularly limited, but is preferably, for example, 0.5 mm to 30.0 mm. The inner diameter after shrinkage is not particularly limited, but is preferably, for example, 0.3 mm to 25.0 mm. It is appropriately determined according to the outer diameter and the circumference of the member to be covered.

  The member to be covered is not particularly limited. The cross section in the radial direction includes, for example, a member having a substantially circular shape, a substantially rectangular shape, or the like.

The method of manufacturing the tube portions 2, 22, 32 is not particularly limited, and can be obtained by extrusion molding, injection molding, or the like.
When the tube sections 2, 22, and 32 are heat-shrinkable tubes, as a method of expanding the diameter of the original tube, a method of inserting a cylindrical member into the tube after extrusion molding to expand the diameter, or a method of expanding the inside and outside of the tube. And increasing the diameter by changing the pressure.
The diameter expansion rate of the heat-shrinkable tube is preferably 30 to 200%. Here, the diameter expansion rate is defined by the following equation.
{(Inner diameter after expansion 径 inner diameter before expansion) -1} × 100 [%]
When the diameter expansion rate of the tube is 30 to 200%, the heat shrinkability is excellent, which contributes to preventing the cap member 1 from falling off from the member to be covered, and the cap after shrinking falls off even in a severe use environment. It becomes difficult to do.

The cap members 1, 21, and 31 can also be suitably used in electrical insulation applications, and when used in electrical insulation applications, the dielectric breakdown voltage is preferably 5 kV or more.
(Method of measuring dielectric breakdown voltage)
A metal bar is inserted into the inner diameter of the tube, and the metal bar covered by the tube is used as an internal electrode. In addition, a metal clip is provided so as to pinch the sealing portion, thereby forming an external electrode. A voltage is applied to the internal electrode and the external electrode at a speed of 1000 V / sec, and a dielectric breakdown voltage [kV] between the tube and the sealing portion is measured.

As shown in FIG. 2, it is preferable that the cap member including the two tube portions has electric insulation between the tubes. The insulation voltage between the tubes is not particularly limited.
(Method of measuring insulation voltage between tubes)
A metal rod is inserted into each of the two tubes, and this is used as an internal electrode. A voltage is applied to the two internal electrodes at a speed of 1000 V / sec, and a voltage [kV] when current flows between the electrodes is measured.

  Hereinafter, the cap member (FIGS. 1 and 2) of the present invention will be specifically described with reference to examples, but the scope of the present invention is not limited thereto.

Example 1 is a cap member composed of one tube as shown in FIG.
The tube part is a heat-shrinkable tube made of FEP.
The inner diameter of the tube before contraction is 3.8 mm, the wall thickness is 0.3 mm, the length is 10.0 mm, and the expansion ratio is 150%. The sealing portion is made of the same material as the tube portion, and has a square shape with an axial length of about 5 mm and a radial width of about 4 mm.

Example 2 is a cap member including two tubes shown in FIG.
The tube part is a heat-shrinkable tube made of FEP.
The dimensions of the tubes before shrinkage are the same as in Example 1, and the sealing portion that integrates the two tubes has a square shape with X of about 7 mm and Y of about 4 mm.

  These examples were evaluated for the dielectric breakdown test, assuming that the pull-out strength between the cap member and the member to be coated and the case of being used for insulation were used, and the results are shown in Table 1. For Example 2, the insulation voltage between tubes is evaluated.

(Pull strength measurement)
This time, as the member to be covered, a member having a substantially rectangular cross section in the radial direction (having a circumference of about 8 mm) is used, but is not limited thereto.
The length of the covering portion of the cap member is about 8 mm.
After covering the heat-shrinkable tube with the heat-shrinkable tube at about 200 ° C., the pull-out strength between the cap member and the material to be coated is measured using a tensile tester. The drawing speed is 500 [mm / min], and the maximum strength [N] until the cap member is completely removed is measured.

(Dielectric breakdown voltage test)
A metal rod is inserted into the inner diameter of the tube, and is thermally shrunk at about 200 ° C., and the coated metal rod is used as an internal electrode. In addition, a metal clip is provided so as to pinch the sealing portion, thereby forming an external electrode. A voltage is applied to the internal electrode and the external electrode at a speed of 1000 V / sec, and a dielectric breakdown voltage [kV] between the tube and the sealing portion is measured.
In Example 2, the measurement is performed by inserting a metal rod into the inner diameter of one of the tubes.

(Insulation voltage between tubes)
For Example 2, a metal bar is inserted into two tubes, the shrink tube is shrunk at about 200 ° C., and the coated metal bar is used as an internal electrode. A voltage is applied to the two internal electrodes at a speed of 1000 V / sec, and a voltage [kV] when current flows between the electrodes is measured.

The pull-out strengths of the examples are all as good as 5 N or more, and the effect of preventing falling off can be expected.
It has an excellent dielectric breakdown voltage of 5 kV or more, and can be used for insulating purposes. The insulating voltage between two tubes is as good as 15 kV.
As described above, the cap member according to the present invention can effectively prevent the cap member from falling off from the member to be covered even in various use environments, and is suitably used for various protection applications.
Furthermore, since all of the examples have excellent insulation properties, they are suitably used for electric insulation.

1, 21, 31 Capping members 2, 22, 32 Tube portions 3, 23, 33 Sealing portion L Length of sealing portion in axial direction W Width of sealing portion in radial direction X, Y Length of sealing portion Sa

Claims (8)

A cap member comprising a tube-shaped member having a sealing portion at one axial end.
Wherein the shape of the sealing portion is substantially rectangular,
The cap member according to claim 1.
In the substantially rectangular sealing portion, the axial length is 1.0 to 10.0 mm,
The cap member according to claim 2.
At least two of the tube-shaped members are arranged substantially in parallel, and have a structure integrated via the sealing portion,
The cap member according to claim 1.
Wherein the shape of the sealing portion is a substantially rectangular plate shape,
The cap member according to claim 4.
The cap member comprises a heat-shrinkable tube,
The cap member according to claim 1.
The pull-out strength between the cap member and the member to be coated is 3N or more,
The cap member according to any one of claims 1 to 6.
Characterized by being made of fluororesin,
The cap member according to claim 1.

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