JP3743083B2 - Insulated wire exposed end waterproof insulation boot - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exposed end waterproof insulating boot of an insulated wire, and more specifically, seals the exposed end of an insulated wire in an insulated boot filled with a curable liquid material to ensure waterproofness and insulation.
[0002]
[Prior art]
An insulated wire usually consists of 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 insulation device.
[0003]
When it is necessary to connect the exposed ends of multiple insulated wires in the production of wiring equipment, it is achieved by using a connection device, but more reliable connection is achieved by soldering or welding the conductive core and using an insulating boot. It is achieved by doing. It is also important to seal the insulating boot when there is a risk of moisture or corrosion.
[0004]
The exposed end of the insulated wire may be housed in an insulating boot containing a curable liquid material, and after the insulating boot is attached, it may be solidified. Such a mechanism is disclosed, for example, in U.S. Pat. No. 3,550,765, where the exposed end of the insulated wire is enclosed in an insulated boot.
[0005]
[Problems to be Solved by the Invention]
However, this type of insulation boot is not reliable if the insulated wire leans against the inner wall of the insulated boot under humid or corrosive conditions and the curable liquid material does not surround the insulated wire.
[0006]
U.S. Pat. No. 3,597,528 discloses a cover that can secure an insulated wire to the center of an insulated boot, but this extra component adds cost and assembly time.
[0007]
Also, this type of insulated boot is insulated even if the insertion depth of the insulated wire is sufficient, and the exposed insulated wire is not sufficiently inserted into the curable liquid material if the filling amount of the curable liquid material is small. When the length of the portion is not sufficient, a gap generated between the insulated wire and the curable liquid material due to a strong external force reaches the conductive core portion of the insulated wire terminal, which causes further problems.
[0008]
For example, in FIG. 1, the 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 substance 14 such as an epoxy resin. The insulated wire 11a is inserted into the insulated boot 13, and the resin is cured by a method such as heating so that the curable liquid substance 14 is solidified, and the insulated wire is sealed. Such an insulating boot has excellent current leakage resistance and moisture penetration resistance when used correctly.
[0009]
FIG. 2 shows the insulating boot 13 that has been used incorrectly, and the insulated wire 11 b leans against the side wall of the insulating boot 13. In this case, since there is little curable liquid substance 14 between the insulating boot 13 and the insulated wire 11b, a gap may be generated between the insulated boot 13 and the insulated wire 11b due to a strong external force. Therefore, the insulated wire 11b is not completely contained, and moisture may enter from between the insulated wire 11b and the insulated boot 13, resulting in the risk of corrosion. FIG. 4 is a cross-sectional view taken along the line XX of FIG.
[0010]
Next, FIG. 3 shows another insulating boot 13 that has been used incorrectly. In this case, the insertion depth of the insulated wire 11c is insufficient, and the exposed end 12 is close to the insulated boot 13. A strong external force may cause a gap between the upper portion of the insulating boot 13 and the insulated wire 11c. Therefore, moisture may pass between the curable liquid material 14 and the insulating boot 13 and reach the exposed end 12. In the case of the insulating boot 13 shown in FIGS. 2 to 4, moisture and corrosion deteriorate the electrical connection and cause current leakage, resulting in unreliability. The object of the present invention is to solve these problems and to provide an inexpensive and reliable insulating boot.
[0011]
[Means for Solving the Problems]
The present invention is formed to receive a curable liquid material used in containment exposed end of the plurality of insulated wires, one end of an insulating boot comprising an elongate tubular sheath which the other end is closed is opened, the insulating a boots one place neck formed by reducing the inner diameter between the ends of, 該頸portion is dimensioned to receive a plurality of insulated wires in use, the position of the plurality number of insulated wires The insulating boot is held in the center, and the upper and lower sides of the neck are sufficiently larger in inner diameter than the neck and have outward projections, and the insulating boot is made of a transparent material. The insulated wire depth mark for confirming the insertion depth of the plurality of insulated wires is a convex portion on the lower side of the neck, and the liquid depth for confirming the curable liquid material depth. mark consists of an upper projecting portion of the neck insulated wire As its gist that the exposed end waterproof insulated boots.
[0012]
The neck of such an insulation boot regulates the movement of the insulated wire inserted in the insulation boot and positions the insulated wire at the center of the insulation boot, so the insulated wire is held at the center of the insulation boot. Guarantee that And ensure that the insulated wire is contained on both the upper and lower sides of the neck. The insulating boot is preferably a flexible plastic material. The neck may be formed by any suitable method, 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 portion can also be formed on the insulating boot by inserting a relatively rigid insert having an upper and lower convex portion into the insulating boot. This prevents the deformation of the insulating boot by resisting the insert against the external force and maintaining the original shape of the insulating boot. When the neck is formed by deformation of the side wall of the insulating boot, the neck may be formed either before or after insertion of the insulated wire.
[0014]
The curable liquid material can be solidified, and may be, for example, an epoxy resin that can be cured by heat or the like after inserting an insulated wire into the curable liquid material. Two or more insulated wires can be simultaneously sealed, and a plurality of insulated wires can be connected by, for example, soldering or welding before being sealed.
[0015]
The insulating boot is preferably made of a transparent material, and a depth mark can be attached to indicate the desired insertion depth of the insulated wire or the depth of the curable liquid substance. Such a mark ensures that an appropriate insertion depth and curable liquid material depth can be obtained in all cases by visual inspection of the insulation boot, such as the insertion depth of the insulated wire and the injection depth of the curable liquid material, Improve quality control and reliability. The depth mark is preferably attached to both sides of the neck, and can be formed by outwardly protruding portions of the insulating boot. This is because, together with the above improvement, the width of the curable liquid material is widened around the insulated wire, so that it is difficult for a gap to be generated between the insulated wire and the curable liquid material even against a strong external force.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described based on examples with reference to the drawings.
However, it is not limited to this.
[0017]
5 to 10 show a first embodiment of the present invention. The insulated wire 21a is electrically connected, for example, by soldering or welding, and is connected by the exposed end 22 thereof. Further, the soft insulating boot 23a includes the curable liquid material 14 as described above. The insulating boot 23 a has a neck portion 25, and the inner diameter of the neck portion 25 is much smaller than the inner diameters of the upper side and the lower side of the neck portion 25. The electric wire 21a is inserted into the insulating boot 23a and held in the center by the neck portion 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 prior art problem shown in FIG.
[0018]
As shown, the insulating boot 23a also has outwardly convex portions 26, 27 on the upper and lower portions of the neck 25. These protrusions 26, 27 are optional, but provide a convenient depth mark and are useful when the insulating boot 23a is made of a transparent material. The lower convex portion 26 suggests the minimum insertion depth of the insulated wire 21a to the operator, while the upper convex portion 27 suggests the minimum depth of the curable liquid material 14. Thus, the problem of the prior art shown in FIG. 3 is solved.
[0019]
The depth mark can be added to the transparent insulating boot 23a by any convenient method, for example, a line printed on the outer surface, or a horizontal ridge or depression. The neck portion 25 may be formed either before or after the insulated wire 21a and the curable liquid material 14 are inserted. When the viscosity of the curable liquid substance 14 is high, the latter is desirable.
[0020]
As shown in FIG. 6, the neck portion 25 may bend the wall inward over the entire circumference of the insulating boot 23a. Alternatively, as shown in FIG. A sufficient number of pushing portions 25b to be held at the center of 23b may be formed in the insulating boot 23b.
[0021]
8-10, the insulating boot 23c may be formed with suitable internal protrusions or ridges 28. FIGS. 8 and 9 show a sufficient number of internal ridges 28 formed integrally with the insulating boot 23c and sufficient to hold the insulated wire 21c at the center of the insulating boot 23c. FIG. 10 shows, as another example, a spoke 29 which is molded integrally with the insulating boot 23d and holds the insulated wire 21d at the center of the insulating boot 23c.
[0022]
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 the elastic insulating boot 33a, and between the upper and lower convex portions 37, 36. The neck 35 is formed on the surface. The insert 38 is a rigid four-armed cross and has a central hole 39 for receiving the insulated wire 31a. Each arm 40 of the cross has upper and lower convex portions 37 and 36, and the arm 40 has a length dimension that can ensure a preferable containment depth. Each arm 40 may be further provided with an inward convex portion in a manner like the inward ridge 28 of FIG.
[0023]
FIG. 12 shows an insulating boot 33a with a rigid insert 38 therein. The curable liquid material 14 surrounds and encloses the insulated wire 31a and spreads 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.
[0024]
FIG. 13 shows a third embodiment of the present invention, and the insulating boot 33b has a substantially triangular cross section in which the width of the other end 42 closed from the opened one end 41 is narrowed. When the insulated wire 31b is inserted from the open end 41 of the insulated boot 33b, the insulated wire 31b is positioned at the center of the insulated boot 33b as it approaches the closed end 42. The convex portions 36b and 37b may be used as the depth mark as described above.
[0025]
Moreover, the process of sealing the exposed end of an insulated wire using the insulation boot of the said embodiment is demonstrated below. B) Creation of a tubular insulating boot having a closed end and an open end. B) Injecting a curable liquid material into the insulating boot. C) Insert an insulated wire into the insulation boot. D) Crimping the insulating boot to form the neck between both ends of the insulating boot. E) Solidification of the curable liquid substance.
[0026]
If the insulating boot is transparent and has a depth mark, the method may further include the following steps. B) Inject curable liquid material to the outermost depth mark. C) Insert the insulated wire so that the exposed end is inside the innermost depth mark. D) Crimping the insulation boot between depth marks.
[0027]
As an alternative, the crimping process may be performed before inserting the insulated wire. As another alternative method, the curable liquid material that can be solidified may be injected after inserting the insulated wire or after the crimping process.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a prior art insulation boot used correctly.
FIG. 2 is a cross-sectional view showing a prior art insulating boot that has been mistakenly used.
FIG. 3 is a cross-sectional view showing another insulating boot used in the prior art by mistake.
4 is a cross-sectional view taken along line XX in FIG.
FIG. 5 is a perspective view showing a first embodiment of the present invention.
6 is a cross-sectional view taken along line YY in FIG.
FIG. 7 is a cross-sectional view showing another example of the first embodiment.
FIG. 8 is a sectional view showing a reference example of the first embodiment.
9 is a cross-sectional view taken along the line ZZ in FIG.
FIG. 10 is a sectional view showing a reference example of the first embodiment.
FIG. 11 is a perspective view showing a rigid insert used in the second embodiment of the present invention.
12 is a cross-sectional view of an insulating boot fitted with the rigid insert of FIG.
FIG. 13 is a cross-sectional view of an insulating boot according to a third embodiment of the present invention.
[Explanation of symbols]
11a, 11b, 11c, 21a, 21b, 21c, 21d 31a, 31b Insulated wire 12, 22 Exposed end 13 23a, 23b, 23c, 23d 33a, 33b Insulating boot 14 Curing type liquid substance 25 Neck part 25b Push-in part 26, 27 Convex part 28 Convex 29 Spokes 36, 37 Convex part 38 Insert 39 Central hole 40 Arm 41 Open end 42 Closed end

Claims (1)

Is formed to receive a curable liquid material used in containment exposed end of the plurality of insulated wires, an insulating boot comprising an elongate tubular sheath having one end the other end is closed is opened, the insulating boots ends A neck portion having a small inner diameter therebetween, the neck portion being sized to receive the plurality of insulated wires when in use, and the positions of the plurality of insulated wires being The upper and lower sides of the neck are sufficiently larger in inner diameter than the neck and have outward projections, and the insulating boot is made of a transparent material. The insulated wire depth mark for confirming the insertion depth of the plurality of insulated wires is a convex portion on the lower side of the neck, and the liquid depth mark for confirming the curable liquid material depth is the neck. exposed end proof of insulated wire consisting of an upper protrusion parts Insulated boots.

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