JP2001339839A - Cable's coming off preventing apparatus for prefabricated joint for cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable connection of a conductor 7 having large cross-sectional area, and to facilitate the connection on top of that by improving construction which prevents a connecting sleeve 8a fixed to the end part of the conductor 7, from coming off from connecting recession 6a of a connecting conductor element 5. SOLUTION: A locking segment 19 supported on the side of the connecting sleeve 8a is engaged with a locking recession 18 formed in the internal surface of the connecting recession 6a, and coming off of the connecting sleeve 8a from this connecting recession 6a is prevented. A spring for urging a pressing segment 31a for displacing the locking segment 19 in the radial outward direction is provided between a stepped part 40 and a base board 42. Besides, an extended-out part 44 is formed in the peripheral brim part of this pressing segment 31a, to displace the pressing segment 31a against this spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated cable connecting device for a prefabricated cable connecting portion, and more particularly to an improvement of a prefabricated connecting portion for connecting ends of a CV cable used as an underground power transmission line.

[0002]

2. Description of the Related Art A prefabricated connection as shown in FIG. 6 has conventionally been used to connect the ends of CV cables constituting an underground power transmission line. The prefabricated connection shown in FIG. 6 converts one CV cable 1 into two CV cables 1, 1 (or conversely, two CV cables 1, 1 into one CV cable 1). This shows a structure called a Y joint for connection. First, the structure of the prefabricated connection portion will be briefly described.

[0003] The CV is formed by combining a plurality of members.
An insulating molded product 4 is held and fixed inside a case 2 having three openings 3, 3 in accordance with the number of the cables 1, 1, and a conductor connector 5 is embedded and supported in the insulating molded product 4. I have.
The connection recesses 6, 6 provided in the conductor connector 5 in three places corresponding to the number of the CV cables 1, 1 to be connected.
The ends of the conductors 7 constituting the respective CV cables 1 and 1 are connected via connection sleeves 8. The connection sleeve 8 is inserted into each of the connection recesses 6 together with the front end of the conductor 7 in a state of being externally fitted to the front end of the conductor 7. The connection sleeve 8 is pressed into the connection recess 6 by a pressing and fixing sleeve 9 screwed to the connection sleeve 8. The inner and outer peripheral surfaces of the connection sleeve 8, the outer peripheral surface of the end of the conductor 7, and the inner peripheral surface of the connection recess 6 are brought into close contact with each other.
Further, the gap between a part of the inner peripheral surface of the insulating molded product 4 and the periphery of the end of the insulating layer 10 constituting each of the CV cables 1, 1 is closed by pre-mold insulators 11, 11.
Each of the pre-mold insulators 11 is pressed toward the conductor connector 5 by a pressing sleeve 12.

In the case of the conventional structure as described above, the screwing and tightening work of the pressing and fixing sleeve 9 is troublesome, and the workability of assembling the prefabricated connecting portion for the CV cable is poor. Further, when the pressing and fixing sleeve 9 and a tool for tightening the pressing and fixing sleeve 9 are inserted into the insulating molded product 4, there is a possibility that the inner surface of the insulating molded product 4 may be damaged. There is a possibility that the insulation property may be deteriorated with the connection work between the end of the conductor connector 5 and the conductor connector 5. Such deterioration in insulation may be caused by minute metal powder generated when the pressing and fixing sleeve 9 is screwed into the conductor connector 5 and further tightened. Further, when screwing and tightening the pressing and fixing sleeve 9, the pre-mold insulator 11 is connected to the CV cable 1.
Therefore, the total length of the prefabricated connection portion for the CV cable becomes longer because it is necessary to retreat to the center portion side of the cable.

[0005]

DESCRIPTION OF THE PRIOR ART As a technique for solving such a disadvantage of the conventional structure, the present inventor has previously invented a cable detachment prevention device for a prefabricated cable connecting portion as shown in FIGS. (Japanese Patent Application No. 11-52633). In the retaining device according to the prior invention, the end of the conductor 7 constituting the CV cable 1 is connected to the conductor connector 5 and is electrically connected. Further, the end of the conductor 7 is connected to the conductor connector 5. To prevent inadvertent escape from the connection recessed portion 6a provided in the connector.

Unlike the conventional structure shown in FIG. 6, the inner peripheral surface of the connection concave portion 6a is a simple cylindrical surface whose inner diameter does not substantially change from the opening to the far end. or,
At the end of the conductor 7, a connection sleeve 8a, which is a multi-point contact type connection fitting called a multi-band or multi-contact, is externally fitted and fixed. This connection sleeve 8a
Are outer sleeves 13 concentrically combined with each other.
And the inner sleeve 14 and the outer sleeve 1
3 and a holding sleeve 15 screwed to the end of the sleeve. The outer sleeve 13 is provided with a plurality of energizing elastic pieces (not shown) that elastically protrude from the outer peripheral surface of the outer sleeve 13 to secure electrical continuity with the conductor connector 5. I do it. The inner peripheral surface of the outer sleeve 13 and the outer peripheral surface of the inner sleeve 14 are engaged with each other in a wedge shape.

[0007] Further, the tip of the holding sleeve 15 (FIG. 7)
The left end of the outer sleeve 13 and the inner end of the outer end of the outer sleeve 13 (the right end in FIG. 7) are formed with a male screw and a female screw that are screwed together. With the connection sleeve 8a attached to the outer periphery of the end of the conductor 7 as shown in FIG.
And further tightening, the inner sleeve 1
4 is pressed toward the tip of the conductor 7 (to the left in FIG. 7). The inner and outer peripheral surfaces of the inner sleeve 14 correspond to the inner peripheral surface of the outer sleeve 13 and the conductor 7.
To ensure electrical continuity between the outer sleeve 13 and the conductor 7. The assembling of the connection sleeve 8a to the end of the conductor 7 and the screwing / tightening of the holding sleeve 15 and the outer sleeve 13 are performed at the end of the conductor 7 and the connection sleeve 8.
a before insertion into the connection recess 6a. Accordingly, there is no possibility that the insulating molded article 4 is damaged or metal powder adheres to a portion to be insulated when the connecting sleeve 8a is attached to the end of the conductor 7. For this reason, the cause of the insulation failure does not occur with the assembling work of the prefabricated connection portion for the CV cable.

Further, a pair of flat surface portions 16 and 16 are formed in the holding sleeve 15 in parallel with each other, and a tool such as a spanner is used when the holding sleeve 15 and the outer sleeve 13 are screwed and tightened. It can be locked freely. The outer peripheral surface of the outer sleeve 13 also has
A locking portion 17 for locking the tool when tightening is formed.

On the other hand, in the portion near the opening of the inner peripheral surface of the connecting concave portion 6a, a locking concave portion 18 is formed over the entire circumference or at a plurality of positions in the circumferential direction (for example, two positions on opposite sides). ing. Each of the locking recesses 18 is provided at a plurality of circumferential positions (for example, two positions on the opposite side) around the base half (the right half in FIG. 7) of the holding sleeve 15 constituting the connection sleeve 8a. Is supported.

In other words, a partially cylindrical eave plate portion 20 is provided at two positions on the outer peripheral edge of the holding sleeve 15 screwed and fixed to the inner circumferential surface of the opening of the outer sleeve 13 on opposite sides in the diameter direction. I have. Also, the holding sleeve 15
On the inner peripheral edge of the screw cylinder portion 21 having an external thread formed on the outer peripheral surface
Are formed in the direction opposite to each of the above-mentioned eaves plate portions 20. or,
A cylindrical portion 23 is formed on the inner peripheral edge of the holding plate 22 when viewed from the axial direction, and has a substantially oval shape like the holding sleeve 15.
Is formed. The holding plate 22 and the holding sleeve 15 are arranged such that the cylindrical portion 23 and the screw tube portion 21 are arranged concentrically, and the leading edge of the cylindrical portion 23 is abutted against one surface of the holding sleeve 15a in the axial direction. With the connecting screw 2
They are connected and fixed by 4, 24. That is, these coupling screws 24, 24 are inserted into through holes formed at the four corners of the holding sleeve 15, and the distal ends of the coupling screws 24, 24 are screw holes formed at the four corners of the holding plate 22. 2
Screwed to 5, 25 and tightened further.

The locking piece 1 is located inside a circular support hole 26 formed at the center of each of the eaves 20.
9 is supported so as to be freely displaceable in the diameter direction of the connection concave portion 6a. The locking piece 19 includes a cylindrical portion 27 that fits in the support hole 26 slidably and slidably, and an outward flange-shaped flange portion 28 formed on an outer peripheral surface of a base end portion of the cylindrical portion 27. And an engaging projection 29 formed on the base end face. Then, a compression coil spring 30 is provided between the flange portion 28 and the inner peripheral side surface of the eaves plate portion 20, and the locking piece 19
Is urged inward in the diametrical direction of the connection concave portion 6a.

Further, a portion of the inner side of the holding sleeve 15 where the phase in the circumferential direction coincides with each of the support holes 26, that is, the inner peripheral surface of each of the eaves plate portions 20 and the outer peripheral surface of the cylindrical portion 23. At the center of each of the eaves 20 in the circumferential direction, a pressing piece 31 is attached to the pressing sleeve 15.
In the axial direction (the left-right direction in FIGS. 7 and 8). The outer peripheral side surface of the pressing piece 31 is connected to the connection recess 6a.
The cam surface 32 is inclined in a direction away from the locking concave portion 18 formed on the inner peripheral surface of the conductor connector 5 as it goes toward the inside of the conductor connector 5. The engagement between the cam surface 32 and the engagement protrusion 29 formed on the base end surface of the locking piece 19 allows the locking piece to be moved based on the displacement of the pressing piece 31 in the axial direction of the holding sleeve 15. 19 can be displaced in the diameter direction of the connection concave portion 6a.

The pressing piece 31 has a pressing rod 3
3, 33 are joined at the base end (the left end in FIGS. 7 and 8). Each of these pressing rods 33, 33 is
Through the through holes 34 formed near the outer periphery of both ends of the holding sleeve 15, the holding sleeve 15 is projected outside the holding sleeve 15. And the front-end | tip part of each said pushing rod 33,33 (right end of FIGS. 7-9)
Between the heads 35, 35 formed in
The second compression coil springs 36, 36 are provided to give each of the pressing pieces 31 an elastic force in a direction of coming out of the connection concave portion 6a.

When assembling the structure of the invention described above, the end of the conductor 7 to which the connection sleeve 8a has been fitted and fixed in advance is inserted into the connection recess 6a. At the time of this insertion work, the first half of the pressing piece 31 has not yet been inserted between the locking piece 19 and the outer peripheral surface of the pressing sleeve 15, and the pressing piece 31 is, as shown in FIG. The connection sleeve 8a is located inside in the diameter direction. The connection sleeve 8a is connected to the connection recess 6a until the locking piece 19 and the locking recess 18 are aligned.
Once inserted, the annular stopper 37 disposed around the CV cable 1 is displaced toward the connection recess 6a, and the locking piece 19 is moved into the locking recess 18 as shown in FIG. After that, the pre-mold insulator 11 and the like are assembled. The work of connecting the conductor 7 and the conductor connector 5 only requires inserting the connection sleeve 8a into the connection recess 6a. Therefore, the connection operation can be easily performed. or,
It is not necessary to keep the pre-mold insulator 11 far away from the connection sleeve 8a during the connection work, and the axial dimension of the prefabricated cable connection portion can be shortened accordingly.

In the state where the assembly of the prefabricated type connecting portion for the CV cable is completed as described above, the outer surface (the right side surface in FIG. 7) of the stopper 37 is held down by the end surface of the pre-mold insulator 11, and this stopper 37 is the connection recess 6a
Prevents displacement in the direction away from For this reason, the locking piece 19 does not fall out of the locking recess 18 and the connection sleeve 8a and the conductor 7 are connected to the connection recess 6a.
Can be reliably prevented from getting out of the vehicle. In this state, the conductor 7 and the conductor connector 5 are connected to the connection sleeve 8.
a, and the conductors 7 of the plurality of CV cables 1 connected to each other via the prefabricated cable connecting portion are reliably conducted.

On the other hand, when disassembling the prefabricated CV cable connecting portion, the pre-mold insulator 11 is retracted from the stopper 37 (moved to the right in FIG. 7), and The stopper 37 is connected to the connection recess 6.
If the connection sleeve 8a and the conductor 7 are displaced in a direction away from a, the connection sleeve 8a and the conductor 7 can be extracted from the connection recess 6a. That is, if the stopper 37 is moved away from the connection concave portion 6a and the pressing piece 31 is retracted from the base end of the locking piece 19 based on the elasticity of the second compression coil springs 36, 36, the compression is reduced. The locking piece 19 comes out of the locking recess 18 based on the elasticity of the coil spring 30. In this state, if the CV cable 1 is pulled away from the conductor connector 5, the connection sleeve 8a and the conductor 7 are pulled out from the connection recess 6a, and the disassembly of the prefabricated connection portion for the CV cable is facilitated. I can do it.

[0017]

In the case of the above-mentioned prior art structure, "the workability of assembling the prefabricated connection portion for CV cable can be improved" as compared with the above-mentioned prior art. The insulation property does not deteriorate with the connection work with the connector. "" The total length of the prefabricated connection part for CV cable can be shortened. "" The disassembly work of the prefabricated connection part for CV cable becomes easy. ). However, in order to improve the practicality, it is desired to improve the following points.

It is desired to increase the inner diameter of the holding sleeve 15 and the holding plate 22 without increasing their outer diameters, and to increase the diameter of the conductor 7 that can be inserted inside the holding sleeve 15 and the holding plate 22. That is, in the case of the structure of the prior invention shown in FIGS. 7 to 11, in order to displace the pressing piece 31 against the elasticity of the compression coil spring 30, the pressing rod 3
3, 33 were provided. Each of these pressing rods 33, 33
Is required to some extent, and the diameter of the pressing sleeve 15 and the pressing plate 22 in the diameter direction increases accordingly. Therefore, when the outer diameters of the holding sleeve 15 and the holding plate 22 are the same, the inner diameters of the holding sleeve 15 and the holding plate 22 become smaller, and the outer diameter of the conductor 7 that can be inserted inside the holding sleeve 15 and the holding plate 22 is limited. Would be done. Specifically, in the case of a general prefabricated connection portion for a cable, in the case of the structure of the above-mentioned invention, the connection of the conductor 7 having a cross-sectional area of up to about 500 mm ² was the limit.

The above-mentioned holding sleeve 15 and holding plate 22
And simplify the operation of screwing and fixing the holding sleeve 15 to the outer sleeve 13. That is, in the case of the structure of the prior invention shown in FIGS. 7 to 11, the pressing rods 33, 33 and the second compression coil spring 36 provided around each of the pressing rods 33, 33,
36 is exposed to the outside of the holding sleeve 15 and the holding plate 22, the holding sleeve 15 and the holding plate 2
2 becomes complicated. Moreover, this holding sleeve 15
When screwing and fixing to the outer sleeve 13, each of the pressing rods 33, 33 and the second compression coil spring 36,
36 gets in the way. The present invention has been made in view of such circumstances.
The present invention has been made in order to realize a prefabricated cable connecting device for a prefabricated cable, which is improved as described above, without impairing the effects of the above-mentioned prior invention.

[0020]

According to the present invention, there is provided a prefabricated cable connecting portion for a cable according to the present invention, which comprises a conductor connector and a connection recess provided in the conductor connector, as in the conventional structure described above. A cable having an end portion of a conductor projecting therefrom, and a connection sleeve which is externally fitted and fixed to the end portion of the conductor and which is inserted into the connection concave portion to conduct the conductor and the conductor connector. Into the prefabricated connection part. Then, the conductor inserted into the connection recess together with the connection sleeve is prevented from falling out of the connection recess.

[0021] Of the cable removal preventing device of the prefabricated cable connecting portion of the present invention, the device described in claim 1 is the same as the above-described structure of the prior invention, but the inner peripheral surface of the connecting recess. A locking recess formed around the connection sleeve, the locking piece being supported around the connection sleeve so as to be displaceable in the diameter direction of the connection sleeve, and being capable of entering the locking recess. The connection sleeve includes a pressing piece that presses diametrically outward, and a pressing sleeve that prevents the connection sleeve from falling out of the connection recess.

The locking piece is urged inward in a diametrical direction of the connection recess by a first spring, and the pressing piece is a second piece provided between the pressing sleeve and the pressing sleeve. It is provided in a state where elasticity in a direction of coming out of the connection concave portion is provided by a spring, and the locking piece is made to have a diameter of the connection concave portion based on displacement of the pressing piece in the axial direction of the pressing sleeve. It can be displaced in any direction,
By pressing a part of the pressing piece with the end face of the pre-molded insulator externally fitted to the end of the cable, the locking piece can be pushed into the locking recess.

Also, in the second aspect, similarly to the structure of the above-mentioned invention, a locking recess formed on the inner peripheral surface of the connection recess near the opening and a periphery of the connection sleeve are provided. The connecting piece, which is supported so as to be freely displaceable in the diameter direction of the connection sleeve and which can enter the locking recess, and the base end of the locking piece, which is the inner end in the diameter direction of the connection sleeve, are pressed. By pressing the locking piece outward in the diametrical direction of the connection sleeve, a screw cylinder portion having an external thread formed on the outer peripheral surface thereof, and a partially cylindrical eave having a diameter larger than that of the screw cylinder portion In order to prevent the inner sleeve forming the connection sleeve pushed into the connection concave portion from coming off from the outer sleeve forming the connection sleeve, the plate portion and the stepped portion are connected to each other. Week And a restraining sleeve that is fixed to the outer sleeve by screwing the screw cylinder portion.

The retaining piece is supported by a first spring in a state in which the retaining piece is supported inside the support hole formed in the eaves portion of the holding sleeve so as to be freely displaceable in the diameter direction of the connection recess. It is biased inward in the diametric direction. Further, the pressing piece is provided at a portion where the phase in the circumferential direction coincides with the support hole inside the holding sleeve, so that the pressing piece can be displaced in the axial direction of the holding sleeve, and the pressing piece and the step portion of the holding sleeve are provided. Are provided in a state where the elasticity in the direction of coming out of the connection concave portion is applied by a second spring which is provided between the pressing pieces and has a direction of increasing the distance between the pressing piece and the step portion. The outer peripheral side surface of the pressing piece is a cam surface inclined in a direction away from the locking concave portion toward the back of the connection concave portion, and the cam surface is engaged with a base end portion of the locking piece, whereby The locking piece can be displaced in the diametrical direction of the connection recess based on the displacement of the pressing piece in the axial direction of the pressing sleeve. In addition, the tip of the extending portion extending from a part of the pressing piece toward the opposite side to the cam surface with respect to the axial direction of the holding sleeve in a direction in which the distal end of the extending portion projects outside the connection recess from the holding sleeve. Provided. Then, the locking piece is pressed toward the back of the connection concave portion by a stopper pressed by an end face of the pre-molded insulator fitted to the end of the cable at the end edge of the extension portion. It can be freely pushed into the locking recess against the elasticity of one spring.

[0025]

According to the pre-fabricated cable connecting device of the present invention having the above-mentioned structure, the connecting piece of the conductor piece and the locking piece supported on the connecting sleeve side can be connected in the same manner as in the above-mentioned prior invention. The engagement with the locking concave portion provided on the side of the connecting concave portion prevents the connection sleeve and the end of the conductor of the CV cable to which the connecting sleeve is externally fixed from falling out of the connecting concave portion. The conductor and the conductor connector are connected via the connection sleeve.

In particular, in the case of the prefabricated cable connecting portion of the present invention, a second spring for biasing the pressing piece is provided between the pressing piece and the stepping portion of the holding sleeve, for example. The second spring complicates the appearance of the holding sleeve, or the holding sleeve is screwed to the outer sleeve.
It does not interfere with the fixing work. Further, in the case of the invention described in claim 2, the extending portion for displacing the pressing piece against the elastic force of the second spring is provided from a part of the pressing piece in the axial direction of the holding sleeve. It extends toward the opposite side of the cam surface. Such an extended portion, even in consideration of securing the required strength, can be made larger in the circumferential direction and smaller in the radial direction than the pressing rod in the case of the above-mentioned prior invention, in consideration of securing the necessary strength. it can. Therefore, the inner diameter of the holding sleeve can be increased without increasing the outer diameter of the holding sleeve, and the diameter of the conductor that can be inserted inside the holding sleeve can be increased.

[0027]

1 to 5 show an example of an embodiment of the present invention. A feature of the present invention is that the inner diameters of the holding sleeve 15 and the holding plate 22 can be increased without increasing their outer diameters, and the appearance of the holding sleeve 15 and the holding plate 22 is simplified, and In order to facilitate the work of screwing and fixing the holding sleeve 15 to the outer sleeve 13, the structure of the part for displacing the pressing piece 31 a in the axial direction of the holding sleeve 15 is devised. The structure and operation of other parts
Since the structure is the same as that of the previous invention shown in FIGS. 7 to 11 above, the description of the equivalent parts will be omitted or simplified, and the following description will focus on the features of the present invention.

The holding sleeve 15 is provided with a screw cylinder 38.
And a pair of eaves 39, 39 and a step 40.
The threaded cylindrical portion 38 has a male screw 41 formed on the outer peripheral surface thereof. The male screw 41 is provided with the holding sleeve 1.
5 is screwed and fixed to the outer sleeve 13. Further, the eaves plate portion 39 has a partially cylindrical shape having a diameter larger than that of the screw tube portion 38, and exists at two positions on opposite sides in the diametrical direction of the screw tube portion 38. Also, the step 40
Is formed by connecting the screw tube portion 38 and the eaves plate portion 39 to each other, and has an oval outer peripheral shape. In the holding sleeve 15, a holding plate 22 similar to that of the above-described prior invention is fixed to the inside of each of the eave plate portions 39, 39.

And, as in the case of the above-mentioned prior invention,
Inside the circular support hole 26 formed at the center of each of the overhanging plate portions 39, 39, the same locking piece 19 as in the above-mentioned invention is supported so as to be displaceable in the diameter direction of the connection concave portion 6a. are doing. The flange 28 provided on the locking piece 19
A compression coil spring 30 serving as a first spring is provided between the locking piece 1 and the inner peripheral side surface of each of the eaves 39 and 39.
9 is urged inward in the diameter direction of the connection recess 6a.

Further, inside the holding sleeve 15, a portion where the phase in the circumferential direction coincides with each of the support holes 26, that is, the inner peripheral surface of each of the eaves 39, 39 and the holding plate 22.
The pressing piece 3 is provided between the outer peripheral surface of the cylindrical portion 23 and the central portion of each of the eaves portions 39, 39 in the circumferential direction.
1a in the axial direction of the holding sleeve 15 (FIG. 1).
(Left and right directions of 2). The pressing piece 31a is provided with a cam portion 43 on one surface (left surface in FIGS. 1 to 3) of the substrate portion 42 and an extension portion 44 on the other surface (right surface in FIGS. 1 to 3). The cam portion 43 protrudes toward the inner end with respect to the diametrical direction of the holding sleeve 15 at the center in the width direction (vertical direction in FIG. 3) of one surface of the substrate portion 42 and toward the back of the connection recess 6a. It is formed in a state where it does.
The outer peripheral side surface of such a cam portion 43 is provided with the connecting concave portion 6a.
The cam surface 32 is inclined in a direction away from the locking concave portion 18 formed on the inner peripheral surface of the conductor connector 5 as going toward the inside of the conductor connector 5. The engagement between the cam surface 32 and the engaging projection 29 formed on the base end surface of the locking piece 19 causes the engagement of the pressing piece 31 a in the axial direction of the holding sleeve 15 based on the displacement of the pressing piece 31 a. The stop piece 19 can be displaced in the diameter direction of the connection concave portion 6a.

The extending portion 44 is formed on the outer peripheral edge of the other surface of the substrate portion 42 over the entire width of the substrate portion 42 so as to protrude in a direction opposite to the connection concave portion 6a. ing. Such an extension portion 44 has a partially cylindrical shape (arc cross section) in accordance with the shape of the eaves plate portion 20, and is formed on an outer peripheral edge of an end plate portion 45 constituting the holding plate 22. Through the notches 46, 46, it protrudes out of the holding sleeve 15. Further, guide rods 47, 47 are provided at portions of the step portion 40 of the holding sleeve 15 facing the substrate portion 42 of the pressing piece 31a and sandwiching the cam portion 43 from both sides. Two for each 31a,
The holding sleeve 15 is provided in parallel with the central axis. Further, each of the guide rods 4 is
A guide hole is provided at a portion corresponding to 7, 47, and each of the guide rods 47, 47 is slidably inserted into each of the guide holes. And each of these guide rods 47,
The two ends of the second compression coil springs 36, 36, which are the second springs described in the claims, are arranged around the periphery of the step 47 against the surfaces of the step portion 40 and the substrate portion 42 facing each other. I have. With this configuration, each pressing piece 31a is provided with elasticity in a direction of coming out of the connection concave portion 6a.

The cable retaining device of the prefabricated cable connecting portion of the present invention having the above-described structure, as in the case of the above-mentioned invention, presses the locking piece 19 supported on the connection sleeve 8a side by a pressing piece. 31a, this connecting sleeve 8
a of the connecting sleeve 8a and the connecting sleeve by pushing the locking piece 19 into and engaging with the locking recess 18 provided on the connection recess 6a side of the conductor connector 5. 8a conductor 7 of the CV cable 1 externally fitted and fixed
Is prevented from falling out of the connection recess 6a.

Particularly, in the case of the prefabricated cable connection portion of the present invention, the pressing piece 31a is connected to the connection recess 6a.
2nd compression coil spring 3 which urges in the direction to escape from
6 and 36 are connected to the substrate portion 42 constituting the pressing piece 31a.
And the step portion 40 constituting the above-mentioned holding sleeve 8a. Therefore, the second compression coil spring 36,
36 does not complicate the appearance of the holding sleeve 8a or hinder the work of screwing and fixing the holding sleeve 8a to the outer sleeve 13.

In order to displace the pressing piece 31a against the elasticity of the second compression coil springs 36, 36, the extension portion 44 whose distal end edge is pressed by the stopper 37 is provided.
It is partially cylindrical and extends from the outer peripheral edge of the pressing piece 31a toward the opposite side of the cam portion 43 in the axial direction of the pressing sleeve 8a. Such an extended portion 44 is provided with the pressing rods 33, 33 (FIGS. 7, 8, 9, 1 and 2) in the case of the above-described prior invention, even in consideration of securing strength against an axial force.
Compared with 1), the dimension in the radial direction can be reduced by the extent that the dimension in the circumferential direction can be increased. For this reason, the pressing piece 31a
Can be installed outward in the radial direction of the holding sleeve 8a. Therefore, the inner diameter of the pressing sleeve 8a can be increased without increasing the outer diameter of the pressing sleeve 8a, and the diameter of the conductor 7 that can be inserted inside the pressing sleeve 8a can be increased. For example, this holding sleeve 8
When the outer diameter of a is the same as in the case of the above-described prior invention,
In the structure of the prior invention, the conductor 7 having a cross-sectional area of up to about 500 mm ²
In the case of the structure of the present invention, the connection of the conductor 7 up to about 600 mm ² is possible.

In the case of the cable-preventing device of the prefabricated cable connecting portion of the present invention, the extension portion 44 whose distal end is pressed by the stopper 37 is thin and is provided radially outward. Therefore, if the stopper 37 is eccentric with respect to the holding sleeve 8a, the abutment between the stopper 37 and the extending portion 44 may be incomplete. Therefore, the following countermeasures can be used to ensure that the matching is performed.

First, as a first method, the extension portions 4 provided at two positions on the opposite side in the diameter direction of the holding sleeve 8a are used.
An annular portion concentric with the holding sleeve 8a is provided between the leading edges of the sleeves 4 and 44. Such an annular portion is formed separately from the above-mentioned extending portions 44, 44, and then fixed by contact or welding later. Then, the annular portion and the stopper 37 can be freely contacted. Next, as a second method, a wide portion having a large dimension in the radial direction of the holding sleeve 8a is provided at the distal end edges of the extending portions 44, 44 provided at two positions on the opposite side in the diameter direction of the holding sleeve 8a. .
The wide portions and the stoppers 37 can be freely contacted. In any case, even if the stopper 37 is slightly eccentric with respect to the holding sleeve 8a, the stopper 37 and the extended portion 44 can be reliably butted.

[0037]

The cable retaining device for a prefabricated type connecting portion for a CV cable according to the present invention is constructed and operates as described above. It is possible to increase the outer diameter without increasing the outer diameter, to simplify the appearance of the holding sleeve, and to facilitate the work of screwing and fixing the holding sleeve to the outer sleeve.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a half sectional view showing a state in which a member supported by the holding sleeve such as a holding sleeve and a locking piece is taken out and viewed from the same direction as FIG. 1;

FIG. 3 is a partial cutaway view from above in FIG. 2;

FIG. 4 is a view seen from the left side of FIG. 2;

FIG. 5 is also a view from the right side.

FIG. 6 is a cross-sectional view showing an example of a transmission line prefabricated connection portion incorporating a pre-molded insulator pressing device having a conventional structure.

FIG. 7 is a partial cross-sectional view showing an example of a cable retaining device for a prefabricated cable connecting portion according to the prior invention.

FIG. 8 is a half cutaway view showing a state in which a member supported by the holding sleeve such as a holding sleeve and a locking piece is taken out and viewed from the same direction as in FIG. 7;

FIG. 9 is a view as seen from above in FIG. 8;

FIG. 10 is a view seen from the left side of FIG. 8;

FIG. 11 is a view also seen from the right side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CV cable 2 Case 3 Opening 4 Insulation molding 5 Conductor connector 6, 6a Connection recess 7 Conductor 8, 8a Connection sleeve 9 Pressing sleeve 10 Insulating layer 11 Premold insulator 12 Pressing sleeve 13 Outer sleeve 14 Inner sleeve 15 Holding sleeve 16 Flat surface portion 17 Locking portion 18 Locking concave portion 19 Locking piece 20 Eaves plate portion 21 Screw cylinder portion 22 Press plate 23 Cylindrical portion 24 Coupling screw 25 Screw hole 26 Support hole 27 Column portion 28 Flange 29 Engagement protrusion 30 Compression coil spring 31, 31a Press piece 32 Cam surface 33 Press rod 34 Through hole 35 Head 36 Second compression coil spring 37 Stopper 38 Screw cylinder part 39 Eaves plate part 40 Step part 41 Male screw 42 Substrate part 43 Cam part 44 Extension part 45 End plate part 46 Notch 47 Guide rod

Claims (4)

[Claims] 1. A conductor connector, a connection recess provided in the conductor connector, a cable having an end protruding from the conductor, and an external fitting fixed to the end of the conductor. It is incorporated into a prefabricated cable connection portion having a connection sleeve for conducting the conductor and the conductor connector by inserting the conductor, and the conductor inserted into the connection recess together with the connection sleeve comes out of the connection recess. A cable retaining device for a prefabricated connecting portion for a cable, wherein a locking concave portion formed on an inner peripheral surface of the connecting concave portion, and a radial displacement of the connecting sleeve around the connecting sleeve. A locking piece freely supported and capable of entering the locking recess, a pressing piece for pressing the locking piece diametrically outward of the connection sleeve, and the connection sleeve coming out of the connection recess. The retaining piece is urged inward by a first spring in a diametrical direction of the connection concave portion, and the pressing piece is disposed between the retaining piece and the retaining sleeve. Is provided in a state where elasticity in a direction of coming out of the connection concave portion is provided by a second spring provided on the holding member, and the locking piece is formed based on displacement of the pressing piece in the axial direction of the holding sleeve. Is displaceable in the diameter direction of the connection concave portion, and a part of the pressing piece is pressed by an end face of a pre-molded insulator externally fitted to an end of the cable, whereby the locking piece is fixed to the locking concave portion. Pre-fabricated cable connection device that can be pushed into the cable. 2. A conductor connector, a connection recess provided in the conductor connector, a cable having an end protruding from the conductor, and an external fitting fixed to the end of the conductor. The conductor is inserted into a prefabricated cable connection portion having a connection sleeve for conducting the conductor and the conductor connector by inserting the conductor, and the conductor inserted into the connection recess together with the connection sleeve comes out of the connection recess. A cable-retaining device for a prefabricated connecting portion for a cable, the locking concave portion being formed in a portion of the inner peripheral surface of the connecting concave portion near the opening, and the connecting sleeve being provided around the connecting sleeve. By pressing a diametrically displaceably supported locking piece that can enter the locking recess and a diametrically inner end of the connecting sleeve, the base end of the locking piece is pressed. A pressing piece for pressing the locking piece outward in the diametrical direction of the connection sleeve, a screw cylinder having an external thread formed on the outer peripheral surface thereof, and a partially cylindrical eaves panel having a diameter larger than that of the screw cylinder are provided. In order to prevent the inner sleeve constituting the connection sleeve pushed into the connection concave portion from coming off from the outer sleeve constituting the connection sleeve, the screw is formed on the inner peripheral surface of the opening of the outer sleeve. A retaining sleeve fixed to the outer sleeve by screwing the cylindrical portion, and the locking piece is provided inside the support hole formed in the eaves plate portion of the retaining sleeve, in the diameter direction of the connection concave portion. In a state of being supported so as to be displaceable, it is urged inward in the diameter direction by the first spring, and the phase in the circumferential direction coincides with the support hole inside the holding sleeve. The pressing piece is provided between the pressing piece and the step portion of the pressing sleeve so as to be freely displaceable in the axial direction of the pressing sleeve, and has an elastic force in a direction in which the distance between the pressing piece and the step portion is increased. Is provided in a state where elasticity in a direction of coming out of the connection concave portion is given by a second spring having a direction, and the outer peripheral side surface of the pressing piece is further away from the locking concave portion toward the back of the connection concave portion. A cam surface that is inclined to the connecting surface. The engagement between the cam surface and the base end of the locking piece allows the locking piece to be connected to the connecting piece based on the displacement of the pressing piece in the axial direction of the pressing sleeve. Displaceable in the diameter direction of the recess, the tip of the extension portion extending from a part of the pressing piece toward the opposite side to the cam surface with respect to the axial direction of the pressing sleeve,
The connecting sleeve is provided by a stopper which is provided in a direction protruding outside of the connection recess from the holding sleeve, and which is pressed by an end face of a pre-molded insulator which is externally fitted to the end of the cable at the leading edge of the extension. A cable retaining device for a prefabricated cable connection portion in which the locking piece can be freely pushed into the locking concave portion against the elasticity of the first spring by being pressed toward the inside of the concave portion. 3. An extension portion is provided at two positions on the opposite side in the diameter direction of the holding sleeve, and an annular portion concentric with the holding sleeve is provided between the leading edges of the extending portions. 3. The device for preventing a cable from being detached from a prefabricated connection portion for a cable according to claim 2, wherein the annular portion and the stopper are freely adjustable. 4. An extension portion is provided at two positions on the opposite side in the diameter direction of the holding sleeve, and a wide portion having a large dimension in the radial direction of the holding sleeve is provided at the leading edge of each of the extension portions. 3. The cable removal prevention device for a prefabricated cable connection portion according to claim 2, wherein each of the wide portions and the stopper is freely adjustable.