JPH1014078A - Structure of cable terminal section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to satisfactorily pull the entire cable by means of a simple structure at low cost. SOLUTION: A terminal section of a cable 10 is so constructed as to pull the cable in the direction of the cable axis. One end of a pipe 14 made of a synthetic resin is placed on and bonded to the surface of the cable terminal section 11. The portion of the pipe 14 ahead of the end of the cable is compressed in the radial direction. This seals up the interior of the pipe 14, and forms a pull section 20 with which a pull tool can be coupled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cable terminal for pulling a cable in an axial direction, for example, when drawing the cable into a pipe.

[0002]

2. Description of the Related Art Conventionally, when a cable is drawn into a pipe or the like, the structure of the terminal portion thereof is devised so that the terminal of the cable can be easily pulled in the axial direction (for example, the terminal portion). JP-A-58-95908).

One example is shown in FIGS. 6A and 6B. First, as shown in FIG.
A cap 94 made of a synthetic resin or the like is attached to the terminal portion 91 so as to cover the exposed cable core 92 in 1. The cap 94 has a shape having a closed portion 96 at one end and an opening at the other end. The opening is covered on the surface of the cable terminal portion 91 and fixed with an adhesive tape 98 or an adhesive. By doing so, the inside of the cap 94 can be sealed.

After the attachment of the cap 94 is completed, a wire net 100 is disposed outside the cable 90 as shown in FIG. 1B, and one end 102 of the wire net 100 is cut into the surface of the sheath, and tightened and fixed. , A gripper 104 that can be gripped is formed at the other end.

According to the structure obtained by this method,
By gripping the grip portion 104 of the wire net 100, the cable 90 is integrated with the wire net 100.
Can be pulled in its axial direction. Also, during this pulling, the terminal portion 91 of the cable 90 can be protected by the cap 96 and the wire net 100, and the intrusion of moisture from the terminal portion 91 into the cable 90 can be prevented.

[0006]

The above structure has the following problems to be solved.

In order to pull the cable 90,
The wire net 100 must be disposed further outside the protective cap 94. Therefore, the number of parts is large,
The structure is complicated, and the operation of fixing the wire net 100 is troublesome. Moreover, in order to achieve a good cable pulling operation, high strength is required for both the fixing of the cable sheath and the cap 94 and the fixing of the cable sheath and the wire net 100, and a special adhesive or the like is used for both fixing portions. Must be used, which increases the cost.

The cap 94 for protecting the cable terminal portion 91 is of a special shape having a closed portion 96 at one end, has low mass productivity, and is disadvantageous in terms of cost in this respect as well.

The present invention has been made in view of the above problems, and has as its object to provide a structure of a cable terminal portion capable of favorably pulling a cable in the axial direction with a simple and inexpensive configuration.

[0010]

As a means for solving the above-mentioned problems, the present invention relates to a structure of a cable end portion which is pulled in an axial direction, wherein one end of a pipe made of a synthetic resin is provided on a surface of the cable end portion. The pipe is fixed to this surface in a state where it is covered, while a portion of the pipe ahead of the cable end is compressed and deformed to seal the inside of the pipe and form a tension portion to which a pulling tool can be connected. It is.

According to this structure, one end of the single pipe is put on the surface of the cable end portion and fixed to the surface, and the other end of the pipe is compressed and deformed only, so that the inside of the pipe is sealed and the cable is closed. In addition to protecting the cable, the compressed and deformed portion can be used as a tension portion. By connecting a tension tool to the tension portion, the cable can be pulled well.

In particular, when the pipe is made of a heat-shrinkable synthetic resin, and the portion of the pipe covering the surface of the cable end is pressure-bonded to the sheath surface by heat shrinkage, a special adhesive or the like is used. Without using a cable, the cable end portion and the pipe can be firmly connected, and a sufficient tensile strength can be secured.

The specific shape of the tension portion may be appropriately set according to the shape of the tensioning tool connected thereto.
For example, if a through-hole is provided in the above-mentioned pulling portion, a pulling tool can be easily connected to the pulling portion simply by hooking a hook or the like in this through-hole.

It is preferable that the maximum width dimension of the tension portion is equal to or less than the maximum outer diameter of another portion of the pipe. In this way, even if the cable is pulled into a narrow space,
The tension section does not interfere.

An inner annular member is interposed between the sheath surface and the pipe, and an outer annular member is provided on the surface of the pipe at a position shifted from the inner annular member in the cable axial direction. According to the one in which a part of the pipe is pinched, the pinch makes it more difficult for the pipe to come off from the cable end,
To that extent, the tensile load that can be applied to this pipe can be increased.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of obtaining a structure of a cable terminal according to a first embodiment of the present invention will be described with reference to FIGS.
Description will be made based on (c). In this embodiment, as shown in FIG. 1A, the sheath is peeled off at the terminal portion 11 and the cable 10 in a state where the tip of the cable core 12 is exposed to the outside is pulled in the axial direction. However, in the present invention, the specific structure of the main body of the cable 10 does not matter.

First, a bonding material 18 made of an adhesive, a filler or the like is arranged on the surface of the cable end portion 11, and one end 16 of the pipe 14 is put on the outside thereof. This pipe 14
The material is preferably a heat-shrinkable synthetic resin, specifically,
A blend of a fluorine-based resin containing an elastomer and a polyester excellent in rubber elasticity and adhesiveness is preferable. Then, the end portion 16 of the pipe 14 is heated and contracted by heat (reduced diameter), thereby forming the end portion 1.
6 is crimped to the surface of the cable terminal portion 11.

Here, if a material having thermal fusibility is interposed between the pipe 14 and the sheath as the bonding material 18, the bonding material 1 can be utilized by utilizing the heat applied for the heat shrinkage.
8 can be melted at the same time, and a strong connection can be made by both heat shrinkage of the pipe 14 and the bonding material 18 with a simple operation.

Next, in the pipe 14, a portion (right side in the drawing) ahead of the end of the cable core 12 is heated and compressed in an arbitrary radial direction (vertical direction in the drawing) to close the portion. At the same time as the inside of the pipe 14 is sealed, a flat pulling portion 20 as shown in FIGS.
To form Then, a through hole 22 is formed in the tensile portion 20 in the thickness direction.

In the terminal structure thus obtained, a hook 23 (FIG.
(B)), etc., by engaging the
Can be easily connected to each other.
0 can be easily drawn into the pipe or the like. After such a pulling operation is completed, the pipe 14 can be removed integrally with the sheath by simply peeling off the sheath at the cable end portion 11 and the end of the cable core 12 can be exposed to the outside.

This structure is suitable for tension work, and
It is a structure with a small number of parts only by using a single pipe 14, and furthermore, the troublesome work of fixing a wire net as in the related art is not required, and the workability can be improved. In addition, fixed parts can be concentrated in one place,
The structure is also simplified. Moreover, the pipe 14 may be a simple tubular one, and can be easily obtained, for example, by cutting a long pipe material into an appropriate length, and the mass productivity is extremely high.

In the above structure, when the heat shrinkage of the pipe 14 is sufficiently high, only the compression deformation along the single direction as described above is required, as shown in FIG. The maximum width dimension of the tension portion 20 can be set to be equal to or less than the maximum outer diameter of the pipe 14 (specifically, the outer diameter of the end 16 on the side covered with the cable end portion 11). In the case where the temperature is low, the heat compression molding is performed only along the single radial direction as described above.
As shown in the figure, the maximum width dimension W of the obtained tension portion 20 exceeds the outer diameter D of the pipe end portion 16, and this tension portion 20 may hinder the tension work in a narrow space. .

However, even in the case where the heat shrinkage of the pipe 14 is low, as shown in FIG.
As shown in (b), the distal end of the pipe 14 is compressed along a plurality of different radial directions (for example, two directions orthogonal to each other), so that a tensile force having a maximum width dimension W equal to or less than the maximum outer diameter D is obtained. The part 20 can be formed. Further, as shown in FIG. 4 as a third embodiment, the portion 24 protruding outside the outer diameter of the pipe end 16 immediately after compression molding may be cut off or folded. The maximum width dimension W of the tension portion 20 can be set to be equal to or less than the outer diameter D.

FIG. 5 shows a fourth embodiment.

In this embodiment, the cable terminal 11
The inner annular member 26 is formed by winding a wire or the like at an appropriate position on the surface of the above, and the pipe 14 is put on the inner annular member 26. The wire or the like is placed on the surface of the pipe 14 at a position slightly shifted from the inner annular member 26 in the cable axial direction. Is wound to form the outer annular member 28, and then the pipe 14 is thermally contracted. That is, in the structure according to this embodiment,
A part of the pipe 14 is sandwiched between the inner annular member 26 interposed between the surface of the cable end portion 11 and the pipe 14 and the outer annular member 28 disposed outside the pipe 14. .

According to such a structure, the two annular members 2
Due to the presence of 6, 28, a part of the pipe 14 is deformed into a wavy shape, and the pipe 14 from the cable 10 is more difficult to come off. Therefore, the tensile load that can be applied to the tensile portion 20 can be further increased.

In each of the above embodiments, the pipe 14 made of a heat-shrinkable synthetic resin is used.
Can be fixed to the cable end portion 11 with an adhesive or the like. However, in this case, it is necessary to use a special adhesive or the like in order to obtain a sufficient tensile strength. On the other hand, if the above-described heat-shrinkable synthetic resin pipe 14 is used, the heat shrinkage causes There is an advantage that the pipe 14 and the cable end portion 11 can be firmly connected without strongly using the cable end portion 11 without using a special adhesive or the like.

Further, in each of the above embodiments, the through hole 22 is provided in the pulling portion 20.
The shape of 0 may be appropriately set according to the shape of the pulling tool connected thereto. For example, a concave portion or a convex portion into which the pulling tool is fitted may be formed on the surface of the pulling portion 20.

[0029]

As described above, the present invention relates to the structure of the cable end portion which is pulled in the axial direction, and is fixed to the surface of the cable end portion in a state where one end of the pipe made of synthetic resin is put on the surface of the cable end portion. On the other hand, since a portion of the pipe ahead of the cable tip is compressed and deformed to seal the inside of the pipe and form a tension portion to which a pulling tool can be connected, a single pipe is used. With a simple and inexpensive structure having only a small number of parts, both protection of the cable and formation of the tension portion can be reliably performed. Moreover, the pipe may be a simple pipe, and can be easily mass-produced by, for example, cutting a long pipe member into an appropriate length, so that the cost can be further reduced.

In particular, according to the pipe made of a heat-shrinkable synthetic resin, and a portion of the pipe covered on the surface of the cable end portion is pressure-bonded to the sheath surface by heat shrinkage, Even without using agents, etc.
By utilizing the heat shrinkage of the pipe, the pipe and the cable end can be firmly crimped, and an effect of securing sufficient tensile strength with an inexpensive configuration can be obtained.

Further, according to the above-described structure in which the through hole is provided in the pulling portion, it is possible to easily connect a pulling tool to the pulling portion simply by hooking a hook or the like in the through hole, and the pulling portion can be easily connected to the pulling portion. In the case where the large dimension is equal to or less than the maximum outer diameter of the other portion of the pipe, an effect is obtained in which even if the cable is drawn into a narrow space, it is possible to reliably prevent the tension portion from being in the way.

Further, in the above structure, the unnecessary pipe can be easily removed integrally with the sheath of the cable terminal portion at the stage when the cable pulling operation is completed.

An inner annular member is interposed between the sheath surface and the pipe, and an outer annular member is provided on the surface of the pipe at a position shifted from the inner annular member in the cable axial direction. According to the structure in which a part of the pipe is interposed, the simple structure of simply arranging the two annular members in place has the effect of dramatically increasing the coupling strength between the cable end and the pipe. Can be

[Brief description of the drawings]

FIG. 1A is a cross-sectional side view showing a stage in which one end of a pipe is attached to a surface of a cable terminal in a first embodiment of the present invention, and FIG. FIG. 3C is a cross-sectional side view showing a terminal portion structure obtained by the above-described method, and FIG.

FIG. 2A is a cross-sectional plan view showing a terminal structure in which a maximum width dimension of a tensile portion is larger than an outer diameter of a portion of a pipe attached to a cable terminal, and FIG. FIG.

FIG. 3A is a sectional plan view showing a structure of a cable terminal according to a second embodiment of the present invention, and FIG. 3B is a front view showing the same structure.

FIG. 4 is a cross-sectional plan view showing a third embodiment of the present invention.

FIG. 5 is a sectional side view showing a fourth embodiment of the present invention.

FIG. 6 (a) is a cross-sectional side view showing a stage in which a cap is attached to a cable terminal in manufacturing a conventional cable terminal structure, and FIG. 6 (b) is a stage in which a wire rope is attached further outside the cap. It is sectional side view shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cable 11 Cable end part 12 Cable core 14 Pipe 16 End of pipe to be attached to sheath surface 18 Bonding material 20 Pulling part 22 Through hole 23 Hook at tip of pulling tool 26 Inner annular member 28 Outer annular member D pipe Maximum outer diameter W Maximum width dimension of tension part

Claims (5)

[Claims] 1. A structure of a cable end portion pulled in an axial direction, wherein one end of a pipe made of a synthetic resin is fixed to the surface of the cable end portion while being covered on the surface of the cable end portion. A structure of a cable end portion, wherein a portion ahead of a tip is compressed and deformed to seal the inside of the pipe and form a pulling portion to which a pulling tool can be connected. 2. The structure of a cable end portion according to claim 1, wherein the pipe is made of a heat-shrinkable synthetic resin, and a portion of the pipe covering the surface of the cable end portion is formed on the sheath surface by heat shrinkage. The structure of the cable terminal part characterized by being crimped. 3. The structure of a cable terminal portion according to claim 1, wherein a through hole is provided in the tension portion. 4. The cable terminal structure according to claim 1, wherein a maximum width dimension of the tension portion is equal to or less than a maximum outer diameter of another portion of the pipe. The structure of the cable terminal part. 5. The structure of a cable end portion according to claim 1, wherein an inner annular member is interposed between the surface of the cable end portion and the pipe, and the inner side surface of the pipe has the inner side member. An outer annular member is provided at a position displaced from the annular member in the cable axial direction, and a part of a pipe is sandwiched between the two annular members.