JPH07307174A - Prefabricated cable connection part - Google Patents

Abstract

PURPOSE:To provide a prefabricated cable connection part of which a cable conductor and an inner electrode conductor in an insulating external tube are fixed mechanically. CONSTITUTION:A terminal metal fitting 31 is formed into a cylindrical shape with smaller diameter than the inner diameter of a metal cylinder 26c of a molded stress cone 26, a key groove 31a through which a key 26e of the metal cylinder 26 c can pass is formed in the outer circumference in the axial direction, and the base part is bent in L-shape and formed in the circumferential direction. The cable terminal part is locked by inserting the key groove 31a of the terminal metal fitting 31 into a recessed part 29 of an epoxy resin external tube 27 along the key 26e of the metal cylinder 26c and holding the key 26e at the L-shape bending part of the key groove 31a by rotating it in the circumferential direction while the front face of the molded stress cone 26 being pressed to the recessed part of the epoxy external tube 27. Consequently, the key 26e of the metal cylinder 26c in the cable edge side is engaged with the key groove 31a of the terminal metal fitting 31 of the epoxy external tube 27 and both terminal fittings are connected mechanically by the metal cylinder and the movement in the axial direction is restricted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated type cable connecting portion using a sliding contact type contactor, and more particularly to a prefabricated type cable connecting portion which prevents axial movement of cables after connection.

[0002]

2. Description of the Related Art Conventionally, a slip-on type prefabricated cable connecting portion using a sliding contact type contactor as shown in FIG. 5 has been used in a prefabricated cable connecting portion of a moving cable. The cable end portion of the prefabricated cable connection portion is compression-connected to the end portion of the cable conductor 2 of the stripped rubber / plastic insulated cable 1 and the terminal metal fitting 3 having a cylindrical portion 3a at the tip thereof, and the cable semiconductive layer. 4, a semiconductive tape winding layer 6 is formed on the cable insulator 5, and a spindle-shaped mold stress cone 7 is fitted from the semiconductive tape winding layer 6 to the cable insulator 5. Has been done. on the other hand,
The epoxy sleeve 9 having the internal electrode conductor 8 is formed with a recess 10 that matches the tip of the mold stress cone 7 at the end of the cable, and the tip cylindrical portion 3a of the terminal fitting 3 at the end of the cable is formed in the center thereof. The conductor insertion hole 12 in which the sliding contact type contactor 11 matching with is inserted is opened. The cable end portion can be inserted and removed by inserting the front surface of the mold stress cone 7 into the recess 10 of the epoxy sleeve 9 and slidingly contacting the cylindrical portion 3a of the terminal fitting 3 with the sliding contact type contactor 11. The connection is made.

[0003]

However, in such a prefabricated cable connecting portion, the connection between the internal electrode conductor 8 and the terminal metal fitting 3 on the cable end side is slidably contacted with the slidable contactor 11. Since the terminal metal fitting 3 is not fixed to the internal electrode conductor 8 in the axial direction, the cable end side moves in the axial direction even after the connection. That is, when the cable end portion is moved in the axial direction in this manner, the positional relationship between the tip end portion of the semiconductive tape winding layer 6 and the rising portion of the semiconductive layer 7a of the mold stress cone 7 is changed, and the electrical conductivity is changed. There has been a problem that the characteristics are deteriorated and eventually cause a dielectric breakdown. The present invention has been made to solve such a problem, and it is an object of the present invention to provide a prefabricated type cable connection part in which the cable conductor and the inner electrode conductor of the insulation sleeve are mechanically fixed and which do not have the above-mentioned problems. To aim.

[0004]

According to the prefabricated cable connecting portion of the present invention, one end of the cable is stepped off to fix the terminal fitting to the exposed cable conductor, while the spindle-shaped stress cone is formed on the outer circumference of the cable insulator. The cable end portion formed by pressing is pressed against an insulating sleeve provided with a terminal fitting having a concave portion matching the tip of the stress cone and having a sliding contact type contactor matching the terminal fitting of the cable end in the center thereof. According to the prefabricated cable connecting portion configured to slip-on connect the terminal fitting of the cable to the terminal fitting of the insulation sleeve via the sliding contact, one of the cable end portion or the insulation sleeve A metal cylinder that surrounds the terminal fitting and into which the other terminal fitting can be inserted, and is rotated around the outer circumference of the metal fitting in a pressed state after slip-on connection. It is characterized by forming a lockable key and keyway by.

[0005]

In the prefabricated cable connecting portion of the present invention, the metal tube is provided on one of the cable end portion and the insulating sleeve so as to surround the terminal metal piece and the other terminal metal piece can be inserted. Since the lockable key and the key groove are formed on the opening and the outer periphery of the terminal fitting to be inserted therein by rotating in a pressed state after slip-on connection, the mold stress cone at the cable end is formed. While inserting the above part into the concave part of the insulating sleeve and further inserting the above-mentioned key along the key groove, by rotating one side in the circumferential direction with respect to the other, both terminal metal fittings are It is locked and mechanically fixed by the key and the keyway. Therefore, the relative movement of the insulating sleeve and the cable end portion in the axial direction is eliminated, and the displacement between the semiconductive layer portion of the mold stress cone and the semiconductive tape winding layer wound on the cable insulator is prevented.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of a prefabricated cable connecting portion of the present invention. In FIG. 1, reference numeral 20 indicates
3 illustrates a rubber / plastic insulated cable such as a stripped CV cable. A terminal fitting 22 having a cylindrical portion 22a at the tip and a flange 22b at the rear end is compression-connected to the end of the exposed conductor 21 of the cable 20, and the cable insulator is inserted from above the semiconductive layer 23. A semi-conductive tape winding layer 25 is provided over 24. The mold stress cone 26 includes an insulating reinforcement member 26b having a cable insulator insertion hole 26a in the axial direction, a cylindrical metal tube 26c coaxially arranged on one side of the cable insulator insertion hole 26a, and Metal tube 26c to metal tube 26
It is composed of a tapered outer peripheral surface on the side opposite to c and an outer semiconductive layer 26d formed on the extension of the cable insulator insertion hole 26a, and these are integrally molded. As shown in FIGS. 2 and 3, the metal cylinder 26
An inwardly facing key 26e is projected from the upper end portion of c, and an inwardly facing annular projection 26f is projected from the lower end portion thereof. The mold stress cone 26 is fitted on the stepped-off cable insulator 24 from the outer semiconductive layer 26d side, and after fixing the terminal metal fitting 22 to the cable conductor 21, it is pulled back to remove the flange 22b. The annular projection 26f is locked and fixed. In FIG. 1, reference numeral 27 indicates an epoxy sleeve to which the cable end is connected,
The internal electrode conductor 28 is integrally molded. The epoxy sleeve 27 is provided with a recess 29 that matches the tapered tip of the mold stress cone 26 at the end of the cable, and the center of the recess 29 matches the terminal fitting 22 fixed to the cable conductor 21. A terminal fitting 31 in which the sliding contact type contact 30 is inserted is provided in a protruding manner. The sliding contactor 30 has a plurality of elastic cut-and-raised pieces inclined in the longitudinal direction on an elastic metal strip and distributed in the longitudinal direction as described in, for example, Japanese Utility Model Application Laid-Open No. 56-22774. It is configured such that the individually provided pieces are wound in a cylindrical shape with these elastic cut-and-raised pieces inside. The terminal fitting 31 has a cylindrical shape with a diameter smaller than the inner diameter of the metal cylinder 26c of the mold stress cone 26, and the key 26e of the metal cylinder 26 is provided on the outer periphery thereof.
Is formed in the axial direction, and its base portion is bent in the L shape to be formed in the circumferential direction. ◎ And the cable end is in the recess 29 of this epoxy sleeve 27.
Insert the key groove 31a of the terminal fitting 31 into the key 26 of the metal tube 26c.
Inserted along e, the front surface of the mold stress cone 26 is pressed in the concave portion of the epoxy sleeve 27, and is rotated in the circumferential direction to lock the key 26e in the L-shaped bent portion of the key groove 31a. To lock. As described above, in the prefabricated cable connection portion of this embodiment, the epoxy sleeve 2
Since the key 26e of the metal tube 26c on the cable end side is engaged with the key groove 31a of the terminal fitting 31 of 7, both terminal fittings are mechanically coupled through the metal tube, and the movement in the axial direction is prevented. Be detained. In the above embodiment, an example in which a key is provided on the cable end side and a key groove is formed on the epoxy sleeve side has been described, but it is of course possible to reverse this.

[0007]

As described above, in the prefabricated cable connecting portion of the present invention, a metal tube is provided surrounding one of the terminal fittings and into which the other terminal fitting can be inserted. Since a key and a key groove that can be locked by rotating after slip-on connection are formed in the opening of the cylinder and the outer periphery of the terminal fitting inserted into the opening, the machine can be rotated by rotating after slip-on connection. Connection is performed and movement in the longitudinal direction is restricted. Therefore, the positional relationship between the tip of the semi-conductive tape winding layer on the cable end side and the rising portion of the semi-conductive layer of the mold stress cone does not change.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a prefabricated cable connecting portion of the present invention.

FIG. 2 is a plan view and a sectional view of a metal cylinder of a mold stress cone.

FIG. 3 is a plan view and a sectional view of a metal cylinder of a mold stress cone.

FIG. 4 is a bottom view of a terminal fitting on the epoxy sleeve side.

FIG. 5 is a vertical sectional view of a conventional prefabricated cable connecting portion.

[Explanation of symbols]

 20 ... Insulation cable 21 ... Conductor 22a ... Cylindrical part 22b, 21a ... Key 23 ... Semi-conductive layer 24 ... Cable insulator 25 ... Semi-conductive tape winding layer 26 ... Mold stress cone 26a ...... Cable insulator insertion hole 26b …… Insulation reinforcement 26c …… Metal cylinder 26d …… External semiconductive layer 26e …… Key 26f …… Annular protrusion 27 …… Epoxy sleeve 28 …… Inner electrode conductor 29 …… Recessed portion 30 …… Sliding contact type contactor 31 …… Terminal fitting

Claims (1)

[Claims] Claim: What is claimed is: 1. One end of a cable is stepped off to fix a terminal fitting to an exposed cable conductor, while a cable end formed by forming a spindle-shaped stress cone on the outer circumference of the cable insulator is fitted to the tip of the stress cone. The terminal fitting of the cable is pressed into contact with the insulating sleeve having the concave portion that has the concave portion and the center portion of which has the terminal fitting having the sliding contact type contact fitting with the terminal fitting of the cable end. In a prefabricated cable connecting part configured to make a slip-on connection to a terminal fitting through a sliding contact, the other terminal fitting surrounding the terminal fitting in one of the cable end portion or the insulating sleeve. A metal cylinder into which the connector can be inserted is placed, and the metal tube can be rotated around the opening of the metal cylinder and the outer periphery of the terminal fitting inserted into the metal cylinder in the axial direction after slip-on connection. The prefabricated cable connecting portion, characterized in that the formation of the lockable keys and keyways.