JPS63309414A - Manufacture of protective cover - Google Patents

Abstract

PURPOSE:To protect a connecting part of an electric wire/cable by covering the same easily and swiftly, by a method wherein a mold is dipped into plastisol by heating the mold, a coating is formed by curing the plastisol corresponding to the outside of the mold and an expected part of cutting-off of the coating is cut off along a longitudinal direction of the same. CONSTITUTION:A mold 18 is dipped into plastisol A by heating the mold 18 and a coating 21 is formed by curing the plastisol A corresponding to the outside of the mold 18. Then the mold 18 is taken out of the plastisol A along with the coating 21, the coating 21 corresponding to an expected part 22 of cutting-off of the mold 18 is cut off along a longitudinal direction of the coating and, a cutting-off part 4 is formed. when cut off fringe parts 5, 6 of the cutting- off part 4 are separated from each other as per arrows B, C and the coating 21 is taken out of the mold 18, a protective cover 1 possessing a cutting-off part 4 in a longitudinal direction can be formed. In other words, the cut off fringe parts 3, 6 of the protective cover 1 become rockable as per the arrows by making the opposite side of the cutting-off part 4 a hinge part 23.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a protective cover.

[Conventional technology and its problems]

A conventional protective cover that covers the connection parts of electric wires, cables, etc., as shown in Fig. 11, has two types: a sheathing material attached to the cable a on the right side, and a sheathing material d attached to the cable C on the left side. It consists of two members, and the protective cover is formed by overlapping the leading ends of the covering materials (A) and (d) and connecting the covering materials (A) and (D) with a mounting material (e) such as adhesive tape. Note that h is a crimp sleeve connecting conductors f and g of left and right cables a and c, i is a covering material, and the base end of d is cable a.

This is a mounting material such as adhesive tape for attaching to C.

Therefore, each coating material S, d is applied to cables A, C, respectively.
After inserting and attaching the cables in advance and connecting the conductors f and g of the left and right cables a and c, the respective sheathing materials s and d are connected, so the connection work is troublesome, and the connection is difficult. There is also the possibility that a gap may occur in the area. Furthermore, cables are coated with this material.

There are some cases where it is difficult or impossible to insert d.

Furthermore, since this protective cover is made up of two members, it also has the disadvantage of high cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a protective cover that can easily and quickly cover and protect connecting parts of electric wires, cables, etc.

[Means for solving problems]

The method for manufacturing a protective cover of the present invention involves cutting along the longitudinal direction, and overlapping the cut edges of the cut portions to form a joining and overlapping portion, thereby forming a joint overlapping portion for electrical wires, cables, etc. A method of manufacturing a protective cover for covering a connection part, etc., wherein a mold is heated and immersed in plastisol, and the plastisol corresponding to the outer surface of the cough mold is cured to form a protective cover with a part to be cut. After forming the coating film, the mold together with the coating film is taken out of the plastisol, and then the portion of the coating film to be cut is cut along the longitudinal direction, and the coating film is placed in the mold. When removed from the protective cover and covering the connection portion, etc., a protective cover having the cut edge portions overlapped with each other is formed.

[Effect]

According to the above method, by heating the mold and immersing it in plastisol, a coating film can be formed on the cough mold with hardened plastisol, and this coating film can be cut. When the planned portion is cut, the opposite side of the cut portion becomes a hinge portion, and the cut edges of the cut portion can be separated from each other. That is, by separating the cut edges of the covering film 51 from each other, an opening is formed in the covering film, which makes it easier to remove the covering film from the mold, and also allows the film to be removed and formed. The protective cover can be fitted onto the connecting portion or the like without being inserted from the end of the cable.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

FIG. 6 shows electric wires/cables (hereinafter referred to as "cables") using the protective cover 1 manufactured by the method according to the present invention.
As shown in FIG. 5, this protective cover l has a cut portion 4 along the longitudinal direction, and the cut edges 5 and 6 of the cut portion 4 are overlapped with each other. Then, a joining and overlapping portion 7 is formed, and the whole is made into a cylindrical shape.

The above-mentioned connecting part 3 is a branch part that branches the branch cable 2b laterally from the middle part of the main cable 2a, and in the illustrated example, the main cable 2a having a flat cross section has a predetermined length of outer covering. Peel off the layer to expose the conductor 8,
A branch terminal 9 is fixed to this, and the branch terminal 9 is provided to protrude laterally from the main cable 2a. The tip of the branch terminal 9 is a rectangular flat overlapping piece 10.

Further, the branch cable 2b is shown as a horizontal trunk line having a flat cross section, and has a compression part 12 into which the conductor protrusion 11 exposed from the end thereof is fitted and crimped, and a rectangular flat overlapping piece part 13. A terminal 14 is fixed to the branch cable 2b.

The overlapping piece part 13 of this crimp terminal 14 and the overlapping piece part 10 of the branch terminal 9 are superimposed on each other and are fastened together with bolts and nuts.

An insulating tape 15 such as a self-bonding butyl rubber tape is wound around the exposed conductor 8 of the trunk cable 2a, and the overlapping piece 10 of the branch terminal 9 is inserted from the branch port 16 onto the insulating tape 15. The above-mentioned protective cover 1 is covered so as to protrude. Further, an insulating tape 17 is wrapped around the overlapping piece 10 of the branch terminal 9, the crimp terminal 14, the conductor protrusion 11, and the end of the branch cable 2b. As for the insulating tapes, for example, it is preferable to use a self-bonding butyl rubber tape 17a on the inside and an adhesive vinyl tape 17b on the outside.

Therefore, to manufacture this protective cover 1, a mold 18 shown in FIG. 1 is used. That is, this mold 18 has a substantially heart-shaped cross section as shown in FIG. A protrusion 20 for forming the branch port 16 is formed. Furthermore, a cutting portion 22 (that is, a groove) for forming the above-mentioned cutting portion 4 is formed along the longitudinal direction on the upper end surface.

Then, by heating this mold 18, as shown in FIG.
The coating film 21 is formed by immersing it in plastisol A and curing the plastisol A corresponding to the outer surface of the mold 18 .

Here, plastisol is a fluid plastic that is also called paste, and when a plasticizer is added to PVC synthesized by emulsion polymerization, it becomes plastisol, which is a poor solvent at low temperatures. When this is heated, the plasticizer covering the surface of the PVC particles penetrates into the inside, producing a plasticized resin.

Therefore, as described above, if the mold 18 is heated and immersed in plastisol A, the heat of the mold 18 will cause the mold 1
Plastisol A corresponding to the outer surface portion of 8 becomes a plasticized resin and becomes a coating film 21.

Next, this mold 18 is taken out from the plastisol A together with the coating film 21, and the coating film 21 corresponding to the portion 22 to be cut of the mold 18 is cut along the longitudinal direction as shown by the dashed line in FIG. The coating film 21 is removed from the mold 18 by cutting to form a cut portion 4, and separating the cut edges 5 and 6 of the cut portion 4 from each other as shown by arrows B and C. , a protective cover 1 having a cut portion 4 in the longitudinal direction as shown in FIG. 4 can be formed. That is, this protective cover 1 has a hinge section 23 on the opposite side of the cutting section 4, and a cutting edge section 5,
6 can swing freely as shown by the arrow. In addition, when removing the coating film 21 from the mold 18, both end surfaces 24, 24
(See FIG. 1 I) When the coating film 21 is formed on the
The coating film corresponding to both end faces 24, 24 is removed.

In addition, as shown in FIG. 6, in order to attach this protective cover 1 to the connecting part 3, the cut edges 5.6 are spaced apart from each other and an opening is formed in the cover 1. Via
The cover 1 is fitted over an insulating tape 15, and as shown in FIG. Attach to connection part 3. In FIG. 6, reference numeral 25 denotes a mounting material such as adhesive vinyl tape, which connects both ends of the cover 1 to the cable 2.
It is attached to the outer covering layer of. Note that the cut edge portions 5.degree. 6 may be joined to each other using a fusing agent, an adhesive, or the like.

Further, if a mold 18 having a substantially circular cross section as shown in FIG. 7 is used, the protective cover 1 can be formed into a substantially cylindrical shape in the covered state as shown in FIG. 8.

FIGS. 9 and 10 then show the protective cover 1 used for the right-angled connection 3, again in the covered state, so that the cut edges 586 meet each other, as shown in FIG. are superimposed on each other to form a joining and overlapping portion 7.

Therefore, in order to manufacture this protective cover 1, as in the above-described embodiment, a coating film 21 having a cut portion 22 on the outer surface.
A mold 18 is formed which can form the following. In other words,
When cutting is performed at the planned cutting portion 22, the cut edge portion 5,
6 are brought into contact with each other (that is, the state shown in FIG. 4), and the cut edges 5 and 6 are brought into a state in which they are overlapped with each other (that is, the state shown in FIG. 5). The mold 18 is such that the internal volume of the protective cover 1 is small.

(The same applies to the above-mentioned embodiments.) Therefore, the ri film 21 is formed using this mold 18, and the ri film 21 is formed using the mold 18. membrane 2
1 is removed from the mold 18, it is possible to manufacture the protective cover 1 that can cover the connecting portion 3 and form the bonded overlapping portion 7 formed by overlapping the connecting portion 3.

Note that the present invention is not limited to the above-described embodiments, and may be modified without departing from the gist of the present invention. For example, the protective cover 1 manufactured by this method may have branch connections or It can be used not only for right-angled connections but also for the terminal end of the cable 2, and also for other things that need to be covered and protected, in addition to the cable 2. This is because, by making the shapes of the molds 18 different, it is possible to form the coating film 21 in various shapes. The heating temperature of the mold 18 is such that when the mold 18 is immersed in the plastisol A, the thickness of the coating film 21 to be formed becomes a predetermined thickness.

〔Effect of the invention〕

According to the method of the present invention, the mold 18 is heated and immersed in Blastisol A to form the coating film 21.
By simply cutting one scheduled cutting section 22, it is possible to easily and quickly form the protective cover 1 provided with the cut edge sections 5 and 6 that overlap each other to form the joining and overlapping section 7. In addition, since this protective cover 1 has the cut end edges 5 and 6 overlapped to form a joined and overlapped part 7, the joining can be easily and reliably done without creating any gaps, and moreover, - When attaching the cover 1 to the connection part 3 of the cable 2, there is no need to insert the cover 1 into the cable 2 in advance, and after connecting the conductor 8, etc., it can be easily fitted onto the connection part 3. Can be installed. Furthermore, it can be easily attached when covering and protecting an object with a complicated shape that cannot be inserted from the end. Furthermore, since the protective cover 1 is made of one piece, it also contributes to cost reduction.

[Brief explanation of drawings]

Figure 1 is a side view showing an embodiment of the mold used in the method according to the present invention, Figure 1 is a sectional view taken along line X-X in Figure 1, Figures 2 and 3 are Fig. 4 is an explanatory diagram sequentially explaining the method according to the present invention, Fig. 5 is a sectional view of the protective cover,
Figure 5 ■ is a plan view thereof, Figure 6 is a cross-sectional view showing the state in which the protective cover is used, Figure 7 is a cross-sectional view of another embodiment of the mold, and Figure 8 is a cross-sectional view of the mold shown in Figure 7. FIG. 9 is a sectional view of the manufactured protective cover, FIG. 9 is a side view of another embodiment of the protective cover, and FIG. 10 is a front view thereof. FIG. 11 is a sectional view showing a conventional protective cover in use. 2...Electric wire/cable, 4...Cutting part, 5, 6...
・Cut edge part, 7... Joining and overlapping part, 18... Mold,
DESCRIPTION OF SYMBOLS 21... Coating film, 22... Cutting planned part, A... Plastisol. Patent Applicant: Mitsubishi Cable Industries, Ltd. 1-1 Figure 3 Figure 4 Figure 7, Figure 2 (1) (It) Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. It has a cut part along the longitudinal direction, and the cut edges of the cut parts are overlapped with each other to form a joining and overlapping part, thereby forming a connection part for electric wires, cables, etc. A method for producing a protective cover for covering a mold, the method comprising heating a mold, dipping it in plastisol, curing the plastisol corresponding to the outer surface of the mold, and forming a coating film having a section to be cut. After forming, take out the mold together with the coating film from the plastisol, and then cut the portion of the coating film to be cut along the longitudinal direction to remove the coating film from the mold, With the connection parts etc. covered above,
A method of manufacturing a protective cover, comprising forming a protective cover having the cut edge portions overlapped with each other.