JPH10149844A - Exposed end waterproof insulating boot for insulated electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secure and inexpensive insulated electric wire exposed end insulating boot for an insulated electric wire exposed end section soldered or welded with a conductive core section. SOLUTION: This insulating boot 23a is formed to accept a hardening liquid material 14 sealing the exposed end 22 of an insulated electric wire 21a, and it is made of a slender tubular sheath closed at one end and opened at the other end. A neck section 25 having a small inner diameter is provided between both ends, the inner diameter of both sides is made sufficiently larger than that of the neck section 25, and the neck section 25 accepts the insulated electric wire 21a at the time of use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof insulation boot at an exposed end of an insulated wire. To ensure.

[0002]

2. Description of the Related Art An insulated wire usually comprises a conductive core and a sheath of insulating material. The end of the insulated wire is insulated in the device to which it is attached or by an attached insulated device.

[0003] When it is necessary to connect the exposed ends of a plurality of insulated wires in the manufacture of wiring equipment, this is achieved by using a connecting device. Achieved by using boots. When there is a possibility of moisture or corrosion, it is important to seal the insulating boot.

[0004] The exposed end of the insulated wire may be housed in an insulated boot containing a curable liquid substance, and after the insulated boot is attached, it may be solidified. Such an arrangement is disclosed, for example, in U.S. Pat. No. 3,550,765, in which the exposed end of the insulated wire is enclosed in an insulated boot.

[0005]

However, under humid or corrosive conditions, if the insulated wires lean against the inner wall of the insulated boot and the curable liquid material does not surround the insulated wires, Kinds of insulating boots are unreliable.

US Pat. No. 3,597,528 discloses a cover that allows the insulated wire to be secured to the center of the insulated boot, but this extra part adds cost and assembly time.

In this type of insulated boot, even if the insertion depth of the insulated wire is sufficient, the exposed insulated wire is not sufficiently inserted into the curable liquid material if the filling amount of the curable liquid material is small. If the length of the portion to be insulated is not sufficiently long, a gap created between the insulated wire and the curable liquid material due to a strong external force reaches the conductive core of the insulated wire terminal, causing further problems.

For example, in FIG. 1, a plurality of insulated wires 11a have exposed ends 12, which are electrically connected by, for example, soldering or welding. An insulating boot 13 made of a suitable soft plastic material such as polychlorinated biphenyl contains a curable liquid material 14 such as an epoxy resin. The insulated wire 11a is inserted into the insulated boot 13, and the resin is cured by, for example, a method such as heating so that the curable liquid material 14 is solidified, and the insulated wire is sealed. Such insulating boots, when used properly, have excellent resistance to current leakage and resistance to moisture penetration.

FIG. 2 shows the insulated boot 13 used incorrectly, with the insulated wire 11 b leaning on the side wall of the insulated boot 13. In this case, the insulating boot 13 and the insulated wire 11
Since a small amount of the curable liquid material 14 is present between the insulating boots 13b, a gap may be generated between the insulating boot 13 and the insulated wire 11b due to a strong external force. Therefore, the insulated wire 11b is not completely enclosed, and there is a possibility that moisture may enter from between the insulated wire 11b and the insulating boot 13, resulting in a risk of corrosion. FIG. 4 is a cross-sectional view taken along line XX of FIG.

Next, FIG. 3 shows another insulating boot 13 used in error. In this case, the insertion depth of the insulated wire 11c is insufficient, and the exposed end 12 is close to the insulating boot 13. Also in this case, a gap may be formed between the upper portion of the insulating boot 13 and the insulated wire 11c due to the strong external force. Therefore, when the moisture is hardened liquid material 14 and insulating boot 13
And may reach the exposed end 12. Figure 2
In the case of the insulating boot 13 shown in FIG. 4, moisture and corrosion degrade the electrical connection and cause current leakage, which is unreliable. An object of the present invention is to solve these problems and provide an inexpensive and reliable insulating boot.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, a waterproof insulating boot at an exposed end of an insulated wire according to the present invention is formed so as to receive a hardening type liquid material used to seal the exposed end of the insulated wire. An insulating boot consisting of an elongated tubular sheath having one end closed and the other end open, having a neck portion having a reduced inner diameter between both ends, and an inner diameter on both sides thereof being sufficiently larger than that of the neck portion. And the neck is dimensioned to receive the insulated wire when in use.

The neck of such an insulated boot regulates the movement of the insulated wire inserted into the insulated boot to position the insulated wire at the center of the insulated boot. Ensure that it is held in the center. Then, it is ensured that the insulated wire is confined on the upper and lower sides of the neck. Preferably, the insulating boot is a flexible plastic material. The neck may be formed by any suitable method, such as, for example, one inward recess, a plurality of inward recesses, or outward protrusions on both sides of the neck.

[0013] Alternatively, the neck may be formed by a relatively rigid insert into the insulating boot. The neck can be formed in the insulating boot by inserting a relatively rigid insert having convex portions on the upper and lower sides into the insulating boot. This prevents the insert from resisting deformation by maintaining the original shape of the insulating boot as the insert resists external forces. When the neck is formed by deformation of the side wall of the insulating boot, the neck may be formed before or after the insertion of the insulated wire.

The curable liquid material can be solidified. For example, after inserting an insulated wire into the curable liquid material,
An epoxy resin that can be cured by heat or the like may be used. Two or more insulated wires can be sealed at the same time, and a plurality of insulated wires can be connected by, for example, soldering or welding before sealing.

The insulated boot is preferably made of a transparent material, and can be provided with a depth mark for indicating the desired insertion depth of the insulated wire or the depth of the curable liquid material. Such a mark ensures that in all cases the proper insertion depth and the depth of the curable liquid material can be obtained by visual inspection of the insulating boot, such as the insertion depth of the insulated wire and the injection depth of the curable liquid material, Improve quality control and reliability. Depth marks are preferably provided on both sides of the neck and can be constituted by outwardly projecting projections of the insulating boot. This is because the width of the curable liquid material is increased around the insulated wire together with the above-mentioned improvement, so that a gap is hardly generated between the insulated wire and the curable liquid material even under a strong external force.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described based on embodiments with reference to the drawings. However, it is not limited to this.

FIGS. 5 to 10 show a first embodiment of the present invention. The insulated wires 21a are electrically connected by, for example, soldering or welding, and are connected at their exposed ends 22. Further, the soft insulating boot 23a includes the curable liquid material 14 as described above. The insulating boot 23a has a neck 25, and the inner diameter of the neck 25 is significantly smaller than the inner diameter of the upper and lower sides of the neck 25. The electric wire 21a is inserted into the insulating boot 23a and is held at the center by the neck 25 as shown. The upper and lower portions of the neck ensure that the curable liquid material 14 surrounds and completely encloses the insulated wire 21a, thereby eliminating the problems of the prior art shown in FIG.

As shown, the insulating boot 23a also
Outwardly convex portions 26, 2 on the upper and lower portions of the neck 25
Seven. Although these convex portions 26 and 27 are optional,
It provides a convenient depth mark and is useful when the insulating boot 23a is made of a transparent material. Lower convex part 26
Indicates to the operator the minimum depth of insertion of the insulated wire 21a, while the upper protrusion 27 indicates the minimum depth of the curable liquid material 14. Thus, the problem of the prior art shown in FIG. 3 is solved.

The depth mark can be added to the transparent insulating boot 23a by any convenient method, such as a line printed on the outer surface, or a horizontal ridge or depression. The neck 25 is formed by the insulated wire 21 a and the curable liquid material 1.
It may be before or after insertion of No. 4. When the viscosity of the curable liquid material 14 is high, the latter is preferable.

The neck 25 may have an inward warp in the wall over the entire circumference of the insulated boot 23a, as shown in FIG. 6, or the insulated wire 21, as shown in FIG.
A sufficient number of pushing portions 25b may be formed in the insulating boot 23b so as to hold b at the center of the insulating boot 23b.

8 to 10, the insulating boot 23c may be formed to have a suitable internal projection or ridge 28. 8 and 9 show a sufficient number of internal ridges 28 molded integrally with the insulating boot 23c to hold the insulated wire 21c at the center of the insulating boot 23c. FIG. 10 shows, as another example, a spoke 29 formed integrally with the insulating boot 23d and holding the insulated wire 21d at the center of the insulating boot 23c.

FIGS. 11 and 12 show a second embodiment of the present invention, in which a molded insert 38 made of a relatively rigid plastic material is inserted into an elastic insulating boot 33a, and upper and lower convex portions 37, 37 are provided. A neck 35 is formed between the two. The insert 38 is a rigid, four-armed, cross-shaped, insulated wire 3
It has a central hole 39 for receiving 1a. Each arm 40 of the cross has upper and lower protrusions 37, 36,
Is a length dimension that can secure a preferable containment depth.
Each arm 40 is further provided with an inwardly protruding portion, for example, as shown in FIG.
May be applied in a manner such as an inward ridge 28.

FIG. 12 shows an insulating boot 33a with a rigid insert 38 inside. The curable liquid material 14 surrounds and encloses the insulated wire 31a and extends from the insulated wire 31a to the inner wall of the insulated boot 33a except for the portion occupied by the arm 40. The convex portions 36 and 37 may be used as depth marks as described above.

FIG. 13 shows a third embodiment of the present invention.
The insulating boot 33b has a substantially triangular section in which the width of the other end 42 closed from the opened one end 41 is reduced. From the open end 41 of the insulating boot 33b to the insulated wire 31b
Is inserted, the insulated wire 31 approaches the closed end 42.
b is located at the center of the insulating boot 33b. Convex part 36b,
37b may be used as a depth mark as described above.

A process for sealing the exposed end of the insulated wire using the insulating boot of the above embodiment will be described below. B) Preparation of a tubular insulating boot having a closed end and an open end. B) Inject a solidifiable curable liquid substance into the insulating boot. C) Insert the insulated wire into the insulated boot. D) The insulating boot is crimped to form a neck between both ends of the insulating boot. E) solidification of the curable liquid substance.

If the insulating boot is transparent and has depth marks, the method may further include the following steps. B) Inject the curable liquid substance to the outermost depth mark. C2) Insert the insulated wire so that the exposed end is inside the innermost depth mark. D) Crimp the insulating boot between the depth marks.

As an alternative, the crimping process may be performed before inserting the insulated wire. As another alternative, the solidifiable, curable liquid material may be injected after the insertion of the insulated wire or after the crimping process.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a properly used prior art insulating boot.

FIG. 2 is a cross-sectional view showing an erroneously used prior art insulating boot.

FIG. 3 is a cross-sectional view showing another prior art insulating boot used in error.

FIG. 4 is a sectional view taken along line XX of FIG. 2;

FIG. 5 is a perspective view showing the first embodiment of the present invention.

FIG. 6 is a sectional view taken along line YY of FIG. 5;

FIG. 7 is a sectional view showing another example of the first embodiment.

FIG. 8 is a sectional view showing another example of the first embodiment.

FIG. 9 is a sectional view taken along the line ZZ in FIG. 8;

FIG. 10 is a sectional view showing another example of the first embodiment.

FIG. 11 is a perspective view showing a rigid insert used in a second embodiment of the present invention.

FIG. 12 is a sectional view of an insulating boot in which the rigid insert of FIG. 11 has been fitted.

FIG. 13 is a sectional view of an insulating boot according to a third embodiment of the present invention.

[Explanation of symbols]

11a, 11b, 11c, 21a, 21b, 21c, 2
1d 31a, 31b insulated wire 12, 22 exposed end 13 23a, 23b, 23c, 23d 33a, 33
b Insulating boot 14 Curable liquid material 25 Neck 25b Push-in part 26, 27 Convex part 28 Ridge 29 Spoke 36, 37 Convex part 38 Insert 39 Central hole 40 Arm 41 Open end 42 Closed end

Claims (4)

[Claims] 1. An insulating boot comprising an elongated tubular sheath formed to receive a curable liquid material used to encapsulate an exposed end of an insulated wire and closed at one end and open at the other end. An insulated wire exposed end waterproof insulating boot having a neck with a reduced inner diameter, the inner diameter on both sides thereof is sufficiently larger than that of the neck, and the neck is dimensioned to receive the insulated wire when used. 2. The waterproof insulating boot of an insulated wire according to claim 1, wherein the insulated boot has an insulated wire depth mark for confirming an insertion depth of the insulated wire. 3. The waterproof insulating boot of an insulated wire according to claim 1, wherein the insulating boot has a liquid depth mark for confirming a depth of the hardening type liquid material. 4. The insulated wire waterproof end waterproof insulated boot according to claim 2, wherein the insulated wire depth mark and the liquid depth mark comprise outwardly projecting portions of the insulated boot.