JPH099470A - Cable terminating device - Google Patents

Abstract

PURPOSE: To prevent a conductor pull-out rod from moving up and down and from rotating with a center shaft as an axis since a cut-out part is asymmetrical by engaging the cut-out part of a the conductor pull-out rod which is supported and fixed at the upper portion of a bushing into the U-shaped groove of an upper fixing metal fitting. CONSTITUTION: An upper fixing metal fitting 7 is arranged at the upper portion of a bushing 1 to support a conductor pull-out rod 8. Also, a cut-out part 15 is provided at nearly the center of the rod 8 for asymmetry in reference to a center shaft. Then, a U-shaped groove 17 is in a shape so that the cut-out part 15 of the rod 8 fits in. Namely, by moving the upper fixing metal fitting 7 in the direction of an arrow 20 for the cut-out part 15 of the rod 8, the upper fixing metal fitting 7 can be engaged to the rod 8, thus preventing the rod 8 from rotating with the center shaft as a center and traveling in the longitudinal direction by the upper fixing metal fitting 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable terminating device applied to rising and terminating ends of CV cables.

[0002]

2. Description of the Related Art When terminating a power cable such as a CV cable, electrical protection and mechanical protection are required. Specifically, high reliability is required for the structure that protects the conductor connection part of the cable from electrical damage and the mechanical protection structure that suspends and supports and fixes the relatively heavy cable end. . Further, when the cable is energized, the cable conductor generates heat, so that a twisting force due to thermal expansion and contraction and various other forces are applied to the cable end portion in addition to its own weight. The cable termination must be strong enough to withstand such forces.
In order to meet such a demand, conventionally, for example, Japanese Patent Laid-Open No.
A cable terminating device as described in Japanese Patent No. 266741 is introduced.

[0003]

By the way, since a high reliability is required for the electromechanical protection as described above, conventionally, a structure using a large number of complicated parts is adopted for the cable terminating device. It had been. However, further reduction in the number of parts is required in order to shorten the construction period, reduce the cost, simplify the dangerous work in high places, and so on. The present invention has been made in view of the above points, and an object thereof is to provide a cable terminating device that is easy to assemble, sufficiently reduces the number of parts, and is mechanically durable.

[0004]

The cable terminating device of the present invention comprises a bushing for receiving a cable terminating portion and a conductor pulling rod supported and fixed by an upper fixing metal fitting on the upper part of the bushing. , The outer peripheral surface of the supported portion is provided with a cutout portion having a cross section perpendicular to the central axis of the conductor extraction rod asymmetric with respect to the central axis, and the upper fixing bracket fixes a part thereof to the upper portion of the bushing. The present invention is characterized by including a fixing portion and a U-shaped groove that is fitted in a notch portion of the conductor pull-out rod to prevent rotation about the central axis of the conductor pull-out rod and movement in the longitudinal direction. is there.

[0005]

The cable terminating device is characterized in that the conductor lead-out rod which is supported and fixed to the upper portion of the bushing is connected to the upper fixing member. When the notch part of the conductor lead-out rod and the U-shaped groove of the upper fixing metal fitting are fitted together, the conductor lead-out bar is prevented from moving in the vertical direction, and the notch is asymmetrical so that the conductor lead-out rod rotates about the central axis. Is also blocked. Since the upper fixing metal fitting has all of these functions, no other parts are required for fixing the conductor extraction rod.

[0006]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a vertical sectional view showing an embodiment of a cable terminating device of the present invention. In the figure, a cable end (not shown) is accommodated in the cable end accommodating portion 3 from below the bushing 1 through the protective metal fitting 2. The bushing 1 is molded by molding an epoxy resin or the like, and a washer 4 is embedded in the lower part of the bushing 1. The bushing 1 and the protective fitting 2 are connected and fixed by the bolt 5 inserted into the washer 4. In addition, these are supported on a gantry (not shown).

On the other hand, an internal electrode 6 is provided on the inner surface of the upper portion of the bushing 1 to electrically protect the cable end. An upper fixing member 7 is arranged on this upper surface, and has a structure for supporting the conductor drawing rod 8. The area around the conductor pull-out rod 8 is electrically protected by the corona shield 11. The corona shield 11 is screwed and fixed to the upper fixing member 7 with a bolt 12. The upper fixing member 7 is fixed to the upper end of the internal electrode 6 with a bolt 13 by screwing.

FIG. 2A shows a specific partial vertical cross-sectional view of the conductor lead-out rod 8. In the figure, the conductor drawing bar 8 is illustrated such that the upper half of the conductor drawing bar 8 is a cross section with the central axis X as a boundary, and the lower half thereof is visible. FIG. 2B shows (a)
7 is a transverse cross-sectional view of the conductor pull-out rod 8 shown in FIG. As shown in the figure, one end 8A of the conductor pull-out rod 8 is connected to a high voltage lead wire or the like (not shown) at the upper part of the bushing 1 shown in FIG. Further, the tulip contact 10 and the like shown in FIG. 1 are connected to the other end 8B to make an electrical connection with the cable end. Furthermore, the conductor pull-out rod 8
A notched portion 15 having a cross-sectional shape as shown in FIG. 3B is provided in the supported portion 8C which is substantially in the center of the portion.

As shown in (b) of this figure, the notch 15
The cross section of this part of the conductor extraction rod 8 is asymmetrical with respect to its central axis X by the provision of. That is, if the cross section is circular, it is axisymmetric, but by providing the notch 15, it is asymmetric with respect to the central axis X. The supported portion 8C and the other end 8B of the conductor pull-out rod 8
The large-diameter portion between and has an outer diameter that fits snugly into the through-hole of the internal electrode 6 as shown in FIG. An annular groove 9 as shown in FIG. 2A is provided on the outer circumference of the central portion. An O-ring (not shown) is fitted therein, and when the conductor lead-out rod 8 is mounted on the upper portion of the internal electrode 6 as shown in FIG. 1, the gap between the two is sealed to seal the cable end accommodation portion 3. It serves to keep airtight from the outside.

FIG. 3 shows an explanatory view of the upper fixing member 7. (A) is a top view, (b) is sectional drawing which follows the ZZ line. As shown in the figure, the upper fixing member 7 has a disk shape as a whole, and a U-shaped groove 17 is provided so as to include the central portion thereof. In addition, the peripheral part is, as explained above,
A bolt hole 16 for fixing the internal electrode 6 shown in FIG. 1 with a bolt 13 is provided. This peripheral portion will be referred to as a fixed portion 7A in this specification. U-shaped groove 17 in the figure
As shown by the alternate long and short dash line in FIG. 3 (a), the cutout portion 15 of the conductor pull-out rod 8 is just fitted. That is, by moving the upper fixing member 7 in the direction of the arrow 20 with respect to the cutout portion 15 of the conductor drawing rod 8, the upper fixing member 7 can be fitted to the conductor drawing rod 8.

In the cable terminating device of the present invention having the above-described structure, as shown in this figure, the parts for supporting the conductor pull-out rod 8 are the upper fixing metal fitting 7 and the bolt for fixing this to the bushing 1. It consists of extremely few parts such as O-rings. Therefore, it is easy to attach both
Moreover, the fixing work becomes extremely easy. Therefore, not only the cost can be reduced simply by reducing the number of parts, but also the assembling workability can be improved and the work safety can be secured.

The present invention is not limited to the above embodiments. The cross-sectional shape of the cutout 15 is U provided on the upper fixing member 7.
Any shape may be used as long as it fits in the groove 17, and is asymmetric with respect to the central axis in order to prevent rotation about the central axis. That is, it may be formed by a part of a polygon, or may have a structure in which a curved line and a straight line are appropriately combined. Further, the U-shaped groove 17 may have any shape as long as the notch portion 15 of the conductor pull-out rod 8 is sandwiched from the side thereof, and the upper fixing metal fitting itself does not need to be a disk shape as a whole. .

If necessary, another O-ring or the like may be fitted in the space 19 surrounded by the conductor lead-out rod 8, the upper fixing member 7 and the internal electrode 6 shown in FIG. The airtightness may be further enhanced. Further, in this case, the U-shaped groove 17 of the upper fixing member 7 is closed, and a lid or the like is separately provided so that foreign matter does not fall into the space 19 between the conductor pull-out rod 8 and the internal electrode 6 from the outside. There is no problem even if it is provided. Further, in the above embodiment, the conductor lead-out rod and the conductor at the cable end are connected by using the tulip contact, but the connection may be made by using a compression sleeve or the like which is well known in the related art.

[0014]

The cable terminating device of the present invention described above has a notch portion which is asymmetric in cross section with respect to the central axis of a conductor pulling rod which is supported and fixed by an upper fixing metal fitting on an upper portion of a bushing. Since the notch portion is fitted in the U-shaped groove provided in the upper fixing bracket to support the conductor pull-out rod 8, rotation about the central axis of the conductor pull-out rod and movement in the longitudinal direction are performed. It can be blocked by this upper fixture. Therefore, many other parts for supporting the conductor pull-out rod are not required, and the device can be configured with a small number of parts. This makes it possible to reduce costs, improve workability, improve safety, and the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a cable terminating device of the present invention.

FIG. 2 is an explanatory view of a conductor extraction rod according to the present invention, (a)
Is a partial longitudinal sectional view, and (b) is a sectional view of a cutout portion.

FIG. 3 is an explanatory view of an upper fixing bracket according to the present invention, (a)
Is a plan view and (b) is a sectional view taken along line ZZ.

[Explanation of symbols]

 1 Bushing 3 Cable end housing 6 Internal electrode 7 Upper fixing bracket 8 Conductor lead-out rod 15 Notch

Claims (1)

[Claims] 1. A bushing for receiving a cable end portion, and a conductor lead-out rod supported and fixed by an upper fixing metal fitting on an upper portion of the bushing. The conductor lead-out rod has a conductor lead-out portion on an outer peripheral surface of a supported portion. A cross section perpendicular to the central axis of the rod is provided with a cutout portion that is asymmetrical with respect to the central axis, and the upper fixing bracket includes a fixing portion that fixes a part of the upper portion of the bushing and a cutout portion of the conductor withdrawing rod. A cable terminating device comprising: a U-shaped groove that is fitted in the portion to prevent rotation and longitudinal movement of the conductor drawing rod about the central axis.