JP2000134784A - Sealing structure for cable connection and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the sealing structure of a cable connection, wherein accessory wires are branched from a base wire, with which the workability can be increased by using the sealing material and the material cost can be reduced by improving the yield of the sealing material and also provide a method for manufacturing it. SOLUTION: One or more accessory wires, for example, two accessories wires 11, 12 are branched in the middle of a base wire 10, as shown in figure and unsheathed conductors of then are joined and then calked by a connector 13 to form a joint connection. Meanwhile, a sealing member 20, with a slit which is made of soft material and is formed into a rectangular sheet and has an adhesiveness, is prepared. One side part and the other side part of the sealing member separated from the slit are called a first sealing subsection 22A and a second sealing subsection 22B. The base wire 10 and the two accessory wires 11, 12 are abutted against each other and then pasted to the inner edge part of the front face and the rear face of either of the subsections, for example, the first subsection 22A. Then, this joint is wrapped by the main part 21 of the sealing member to be coated airtightly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire connection portion sealing structure and a method of manufacturing the same.

[0002]

2. Description of the Related Art In general, when the tip of an accessory wire is connected to the middle of an electric wire serving as a base line to form a joint connection portion as if the accessory line branched from the base line, the joint connection portion has a waterproof seal structure. It is said. FIGS. 6 (a) and 6 (b)
As an example of the electric wire connection portion sealing structure, there is shown a sealing material described in Japanese Utility Model Laid-Open No. 1-93918 previously proposed by the present applicant.

[0003] In this case, the covering insulation at an intermediate position of the base line 1 is peeled off, and the conductor 2 is exposed only there. The conductor 4 is also exposed by peeling off the covering insulation at the end of the attachment wire 3.
The stripped and exposed conductors 2 and 4 are connected and connected.

On the other hand, in order to form a waterproof seal structure at the connection portion, a sealing material 5 formed into a soft and sticky sheet such as butyl rubber is prepared. The sealing member 5 has a rectangular sealing body 6 serving as a main portion, and a protruding piece 7 is provided so as to protrude from one end of the sealing body 6, and the entire planar shape is convex. I have.

First, as shown in FIG. 6 (a), a conductor 2, 4 where a base line 1 and an attachment line 3 are connected is applied on a seal body 6 using a sealing material 5 having a flat convex shape. that time,
The base line 1 is placed on one side of the projecting piece 7 of the sealing material 5 with the projecting piece 7 interposed therebetween.
Attach the accessory line 3 to the other side so that it is forked.
In this state, both ends 6a, 6a of the sealing body 6 of the sealing material 5
b with each other facing each other, and the base line 1
And the wires 2 and 3 of the accessory wire 3 are wound and wrapped in close contact. Subsequently, the protruding piece 7 is inserted between the base line 1 and the attachment line 3 and folded in close contact. FIG. 6 (b)
This shows the seal structure after the work has been completed so far, and forms a wire connection portion seal structure in which the attachment line 3 is branched from the base line 1.

In the example shown in FIGS. 6 (a) and 6 (b), a single incidental line 3 is shown to be branched, but a plurality of additional lines 3 may be branched. In the case of a joint connection portion, a sealing material 5 having a flat convex shape provided with only one branching projection 7 cannot be used. Therefore,
In that case, another type of sealing material 5 provided with a plurality of projecting pieces 7 shown in FIG. 6C is prepared.

[0007]

However, FIG.
In the conventional electric wire connection part sealing structures shown in (a) to (c), there is room for improvement in the following points.

One is that the sealing material 5 is basically based on a shape in which one or a plurality of protruding pieces 7 protrude from its main body 6. Since the sealing material 5 has such a planar convex shape, the positioning direction and the working direction of the joint connection portion are uniquely determined, and the workability is low. Moreover,
It is difficult to determine the positioning at the beginning of the operation easily, and the quality of the completed seal structure tends to vary.

The other is that, since the planar shape is a unique shape of a convex shape, the material removal of the sealing material 5 is large, the material yield is deteriorated, and the material cost is increased.

Further, in connection with the above two problems, a plurality of accessory lines 3 are branched from the electric wire base line 1 such as two, three,. It is necessary to prepare a plurality of irregularly shaped sealing materials 5 provided with the protruding pieces 7, which is troublesome in all aspects including production management by various types.

Accordingly, a first object of the present invention is to provide an electric wire connection structure in which an auxiliary wire is branched from a base line, the workability of which is improved by using a sealing material, and an electric wire having a uniform waterproof quality. An object of the present invention is to provide a connection part sealing structure and a method of manufacturing the same.

A second object of the present invention is to provide an electric wire connection portion sealing structure which improves the yield of the sealing material and reduces the material cost, and a method of manufacturing the same.

Further, a third object of the present invention is to provide a seal structure for an electric wire connection portion and a method of manufacturing the same, wherein a single type of seal material can cope with a seal structure in which an arbitrary number of accessory lines branch off from a base line. It is to provide.

[0014]

According to a first aspect of the present invention, there is provided an electric wire connecting portion sealing structure in which conductors are connected as if an arbitrary number of accessory wires are branched from the middle of a base line of the electric wire. The joint connection portion is formed by this, and the joint connection portion is covered with a seal member to secure required waterproofness, and the seal member is formed in a rectangular shape by an adhesive soft sheet material. The first and second seal sub-portions are provided on both sides of a slit provided by cutting in a direction perpendicular to the edge of the seal main portion. In a state where the base line and the attachment line branched from the connection portion are separated from the slit on both front and back surfaces of one of the first and second seal sub-portions, and the first and second seal sub-portions are adhered to each other, It has become in close contact covering the joint connection comprising two sealing secondary portion wrapped inside the seal main unit.

According to the above configuration, in this case, the seal member provided with a single slit positions the base line and the branch attachment line so as to be divided into the slit. Is eliminated and material loss is small.

Further, the electric wire connection part sealing structure according to the second aspect is provided so that slits are cut in a right angle direction from each of the opposing edges of the main part of the seal and face alternately. Either one of them can be used in accordance with the workability of either of the front and back surfaces of the seal member.

In this case, by providing two slits facing each other in the rectangular main part of the seal, one of the two slits can be used in accordance with the operation when using one of the front and back surfaces of the sealing member. Is used,
Workability is improved.

According to a third aspect of the present invention, when the plurality of accessory wires are provided, the first and second seals are provided by appropriately providing an interval between the accessory wires and the base line. In a state of being stuck alternately on either one of the front and back surfaces of the sub-portion, the sub-portion is wrapped from the outside by the seal main portion and is in close contact with the cover.

With the above structure, even if the number of accessory lines increases, if the sealing members are closely interposed between the lines by staggering them and the base line, for example, independent sealing properties are provided for each line. Can be secured.

Further, in the electric wire connection portion sealing structure according to a fourth aspect, a protective tape is further wrapped over the seal member that covers and covers the joint connection portion.

That is, the sealing property of the seal portion can be enhanced by winding the protective tape, thereby protecting the seal portion from damage.

On the other hand, according to a method of manufacturing a wire connection portion sealing structure according to a fifth aspect of the present invention, a conductor in which an insulating sheath is peeled and exposed as if an arbitrary number of accessory wires are branched from the middle of the wire base line. A connecting step of connecting the two parts to form a joint connection part, and forming a rectangular seal main part with an adhesive soft sheet material, and a slit provided by being cut in a right angle direction from an edge of the seal main part. Prepare a seal member having portions on both sides sandwiching the first and second seal sub-portions, respectively, and connect the base line and the attachment line on the side branched from the connection portion from the slit of the seal member to the second position. A joint connecting portion seal positioning step in which the first and second seal sub-portions are separately placed on both front and back surfaces and attached and positioned, and the first and second seal sub-portions are included. The joint connection in close contact coated wrapped inside the seal main portion includes a seal forming step of securing the required waterproofness.

With the above structure, the base line and the attachment line are divided into the slits provided in the rectangular seal main portion, so that the initial positioning of the joint connection portion with respect to the seal member is easy and reliable. Increases sex.

According to a sixth aspect of the present invention, in the method for manufacturing a wire connection portion sealing structure, the seal member cuts in a right angle direction from each of the opposing edges of the seal main portion, and the two slits face each other alternately. In this case, one of the two slits is used in accordance with the workability of either of the front and back surfaces of the sealing member.

That is, by providing slits alternately at the opposing edges of the rectangular seal main portion, even if one of the front and back surfaces of the seal member is used due to work convenience, the slit corresponding to that surface is used. Can be used, and workability can be improved.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a seal structure for a wire connection part and a method of manufacturing the same according to the present invention.

FIGS. 1 to 3 are perspective views showing a manufacturing process of the electric wire connection portion sealing structure according to the first embodiment. In this case, in the connection step shown in FIG. 1, the covering insulating skin in the middle part of one base line 10 is peeled off to expose the conductor 10 a,
The ends of the two accessory wires 11 and 12 are connected to the conductor 10a with the conductors 11a and 12a exposed. Further, by crimping the connection portion with the connector 13 from above, a joint connection portion is formed as if the two accessory lines 11 and 12 were branched from the middle of the base line 10.

On the other hand, a sealing member 20 in the form of a rectangular sheet as shown in FIG. 2 is prepared. As the material of the seal member 20, a soft and sticky material having good workability by bending, for example, a butyl rubber sheet or the like is used. The seal member 20 has a rectangular shape of L × W with a length dimension L and a width dimension W1, and a slit 23 cut in a direction perpendicular to one side of the seal main portion 21 is provided.
The left and right portions divided by the slit 23 are first and second seal subportions 22A and 22B.

Next, as a joint connecting part seal positioning step, as shown in FIG. 1, first, a base line 10 of the joint connecting part is flipped up to be prepared separately from the two attached lines 11 and 12.

As shown in FIG. 3A, in the seal member 20, the rear second seal sub-portion 22B divided by the slit 23 is turned up to open the portion. The parting line of one base line 10 and two attachment lines 11 and 12 is abutted on the slit side edge of the first first seal sub-portion 22A, and, for example, the base line 10 is attached to the surface of the first seal sub-portion 22A. The wires 11 and 12 are attached to the back surface for positioning. At this time, the positioning is performed with an interval of about one line between the two attached lines 11 and 12 on the back side. In addition, the connector 13 can be used as a reference when positioning the front end by abutting the slit side edge of the first seal sub-portion 22A. In this manner, the joint connection portion and the seal member 20 are relatively positioned.

In the illustrated example, the rear second seal sub-portion 22B
However, the first seal sub-portion 22A in the front may be turned up first, and the use direction of the seal member 20 can be determined in accordance with the work direction each time.

Next, in the seal forming process shown in FIGS. 3 (b) and subsequent figures, the second seal sub-part 2
2B is returned to the original position so that the connector 13 already positioned and the baseline 10 before branching are covered from above.

After completing the above setup, FIG.
As shown in (d), the seal main part 21 is bent from below, and the three lines of the base line 10 and the auxiliary lines 11 and 12 and the connector 13, and both the first and second sides of the slit 23 are provided inside.
The seal sub-portions 22A and 22B are rolled in while being brought into close contact with each other.

FIGS. 3 (c) to 3 (f) show a state in which the entirety of the joint connection portion is wrapped around the seal main portion 21 as described above. In this wrapped state,
As shown schematically in FIG. 3 (f), one base line 10 and 2
It is confirmed that each of the attached lines 11 and 12 of the book are properly separated by the seal member 20 without contacting each other. At this time, it is preferable to twist both ends of the seal member 20 in the relative direction in the wrapped state shown in FIG.

Next, in the protective tape winding step shown in FIGS. 3G and 3H, the protective tape T is further transferred from one end to the other end of the wrapped seal member 20 shown in FIG. Spirally to protect the coating. It is desirable that the protective tape T starts to be wound at a position away from one end of the seal member 20 by, for example, 10 mm or more and ends at the other end. After winding with the protective tape T, the sealing member 20
No exposed portion is confirmed, and the cocoon-shaped electric wire connection portion sealing structure shown in FIG. 3H is completed.

FIG. 4 shows a seal member 30 according to a second embodiment of the present invention. In this case, as in the case of the seal member 20 of the first embodiment, L × W1
And is basically rectangular with the same size. Two slits 32 and 33 are cut at alternate positions offset from the center of the length L at each of parallel edges facing each other in the direction of the length L of the seal member 30.

When the seal member 30 of the second embodiment is used, either one of the front and back surfaces of the seal member 30 is used each time in consideration of the convenience of work, and the slits 32 and 33 corresponding to the use surface are used. Use either one of In this seal member 30, the seal member 20 of the first embodiment is further improved, and both the front and back surfaces can be immediately coped with in accordance with the workability, and the direction regulation is eliminated to further improve the usability. Improvements are being made.

In the first and second embodiments of the present invention, since the shape of the seal members 20 and 30 is basically rectangular, the planar members shown in FIG. The material yield is remarkably improved as compared with the seal member 5 having a shape. A substantially L-shaped seal member shown in FIG. 5 is proposed as the seal member. However, in terms of material loss, the L-shaped seal member 40 is compared with the flat convex seal member 5 of FIG. Even better.

However, in the case of the rectangular sealing members 20 and 30 according to the first and second embodiments, the material yield is further improved as compared with the L-shaped sealing member 40 shown in FIG. Can be realized.

That is, in the seal member 40 shown in FIG. 5, the length dimension of the seal main portion 41 is set to L similarly to each of the seal members 20 and 30 of the present embodiment. The width W2 is an added value of the width a of the seal main portion 41 and the length b of the protrusion of the seal sub-portion 42. It is a letter shape.

On the other hand, the seal members 20 and 30 of the present embodiment are smaller than the width W2 of the seal member 40 of FIG. Only W1 is required (W2> W1), so that the size can be considerably reduced. Moreover, material loss due to the provision of the slits 23, 32, 33 in the rectangular seal members 20, 30 is hardly a problem, and the material cost can be reduced together with the processing cost.

In the present invention, in the first and second embodiments, one base line 10 to two auxiliary lines 11,
Although the wire connection part seal structure in which 12 branched was illustrated,
It is not limited to the number of branch lines of such attachment lines. In other words, there is an advantage that the same kind of seal member 20 or 30 can be used for the case where the number of attached lines is one or the case where the number is two or more.

[0043]

As described above, the electric wire connecting portion sealing structure according to the present invention is used for waterproofing a branch portion between a base line forming a joint connecting portion by connecting conductors and an arbitrary number of attached wires. The direction regulation at the time of the sealing operation by the sealing member is eliminated, so that the operation efficiency is remarkably improved, and the material yield is good, so that the minimum material cost is required.

The number of accessory lines branching from the base line is 2
Even if the number increases, such as three or three, it can be dealt with only by preparing a single kind of seal member, and the inconvenience of preparing seal members having different shapes by the number corresponding to the number of accessory lines as in the related art is solved. This has the advantage of reducing production management costs including equipment costs and assembly work costs.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of a power supply connection portion sealing structure according to the present invention, in which one prepared wire base line and two attached wires are caulked with a connector to prepare for a sealing process in the next step. It is a perspective view which shows the joint connection part of a connection stage.

FIG. 2 is a perspective view showing a rectangular seal member as the first embodiment.

3 (a) is a perspective view showing a stage of positioning and attaching a joint connecting portion to a seal member from the state of FIG. 2 in the first embodiment, and FIG. 3 (b) is a diagram of a seal forming operation; FIG. 3C is a perspective view showing an initial stage, FIG. 3C is a perspective view showing a mode in which the joint member is wound by bending the sealing member, FIG. 4D is a front view thereof, and FIG. FIG. 2F is a front view schematically showing a state in which the sealing is completed and the sealing member is uniformly interposed between the lines. FIG. 2G is a front view schematically showing the sealing member after the sealing is completed. Further, a perspective view showing a state of winding a protective tape,
FIG. 1H is a perspective view showing an electric wire connection portion sealing structure having a proper cocoon shape after winding the protective tape.

FIG. 4 is a perspective view showing a seal member according to a second embodiment.

FIG. 5 is a perspective view showing an L-shaped seal member exemplified as a comparison target of each seal member of the first and second embodiments.

FIG. 6 (a) is a perspective view showing a stage in which a connection part by one base line and one attached line is formed as a seal structure by a seal member having a planar convex shape as a conventional example, and FIG. FIG. 2B is a perspective view showing the completed electric wire connection portion sealing structure of the conventional example, and FIG. 2C is a perspective view showing a single seal member of a different kind.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Baseline of electric wire 10a Conductor 11-17 Attached line 11a, 12a Conductor 13 Connector of joint connection part 20 Rectangular seal member with a single slit 21 Seal main part 22A, 22B First and second seal subparts 30 2 Rectangular sealing member with one slit 23, 32, 33 slit 40 L-shaped angle-shaped sealing member

Claims (6)

[Claims] 1. A joint connecting portion is formed by connecting conductors as if an arbitrary number of accessory wires are branched from the middle of a base line of an electric wire, and this joint connecting portion is covered with a seal member. Wherein the sealing member has a rectangular seal main portion formed of a sticky soft sheet material. The portions on both sides sandwiching the slit provided by being cut in the direction perpendicular to the edge are first and second seal sub-portions, respectively, and the base line and the accessory line on the side branched from the connection portion are formed by The joint connecting portion including the first and second seal sub-sections is separated from the slit on the front and back surfaces of either one of the first and second seal sub-sections and attached to the seal connection section. A seal structure for a wire connection portion, wherein the wire connection portion is wrapped inside and tightly covered with a main portion of the wire. 2. A slit is cut in a direction perpendicular to each of the opposing edges of the main part of the seal and is provided so as to face each other, and one of the two slits is provided on one of the front and back surfaces of the seal member. The electric wire connection part sealing structure according to claim 1, wherein the electric wire connection part can be used in accordance with the operation of the electric wire. 3. When a plurality of the accessory lines are formed, the accessory lines and the base line are staggered on one of the front and back surfaces of one of the first and second seal sub-parts with an appropriate interval therebetween. The electric wire connection part sealing structure according to claim 1 or 2, wherein, in the attached state, the sealing main part is wrapped from the outside and closely adhered to the covering. 4. A protective tape is further wrapped around the seal member covering and covering the joint connection portion.
2. The electric wire connection part sealing structure according to 1. 5. A connection step of connecting conductors having an insulating strip peeled and exposed as if an arbitrary number of accessory wires are branched from the middle of an electric wire base line to form a joint connection portion, and an adhesive property. A rectangular seal main portion is formed by a soft sheet material, and portions on both sides sandwiching a slit formed by cutting in a direction perpendicular to an edge of the seal main portion serve as first and second seal sub-portions, respectively. Prepare the sealing member, and divide the base line and the attached line on the side branched from the connection portion from the slit of the sealing member on both the front and back surfaces of any one of the first and second seal sub-portions. A joint connecting portion seal positioning step of sticking and positioning, and including the first and second seal sub-portions, wrapping the joint connecting portion inside the seal main portion and tightly covering the joint connecting portion. A method of manufacturing a seal structure for an electric wire connection portion, comprising a step of forming a seal for securing necessary waterproofness. 6. In a case where the seal member has two slits which are cut at right angles from respective opposing edges of the seal main portion and face alternately, one of the two slits is formed. The method according to claim 5, wherein the sealing member is used in accordance with an operation on either of the front and back surfaces of the sealing member.