JPH01148013A - Power cable conductor leading rod fixing mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a fixing structure for a power cable conductor pull-out rod used as a cable terminal device when connecting the power cable to indoor wiring, overhead lines, or electrical equipment. Regarding.

[Conventional technology]

FIG. 4 shows a conventional fixing structure, in which 1 is a tube made of an insulating material, and an annular upper fitting 3 is fixed to the upper end of the tube by a plurality of fixing bolts 2.

Reference numeral 4 denotes a conductor pull-out rod that extends upward through the tube 1 and the upper metal fitting 3.

A male thread 5 is provided on a part of the outer periphery of the pull-out rod 4, and a female thread on the inner periphery of an annular fixture 6 is screwed into the male thread 5, and a lock nut 7 is further screwed thereon.

A plurality of bolt insertion holes are provided in the fixing metal fitting 6, and a plurality of tightening bolts 8 inserted through the bolt insertion holes are inserted into the upper metal fitting 3.
Screw into each screw hole and tighten.

[Problem that the invention seeks to solve]

In the above conventional structure, the conductor pull-out rod 4 is fixed by tightening the lock nut 7 in a so-called double-nut method, so the loosening torque due to the rotational force of the conductor pull-out rod 4 is only about 80 to 100% of the tightening force. On the other hand, the upper limit of the tightening torque is around 1000k100O, so if more rotational force is applied,
There was a risk that it might come loose.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention allows a conductor pull-out rod to pass through an upper metal fitting firmly fixed to the upper part of the tube,
In a conductor pull-out rod fixing structure in which a fixing bracket fixed to the conductor pull-out rod is fixed to an upper metal fitting with a plurality of tightening bolts, a lock nut screwed into the male thread of the conductor pull-out rod is located at the bottom of the fixing bracket. is crimped to the upper metal fitting via the conductor pull-out rod by the tightening action of the tightening bolt of the fixing metal fitting.

〔Example〕

In the embodiment shown in FIG. 1, reference numeral 11 is a tube made of an insulating material, and an annular upper fitting 13 is fixed to the upper end of the tube with a plurality of fixing bolts 12.

A conductor pull-out rod 14 extends upward through the tube 11 and the upper metal fitting 13.

A male thread 15 is provided on a part of the outer periphery of the pull-out rod 14, and a female thread on the inner periphery of an annular fixture 16 is screwed into the male thread 15, and a lock nut 17 is screwed into the lower part thereof.

A plurality of bolt insertion holes are provided in the fixing metal fitting 16, and a plurality of tightening bolts 18 inserted through the bolt insertion holes are screwed into each screw hole of the upper metal fitting 13 and tightened.

In the case of the above embodiment, the lock nut 17 is seated on the upper end of the upper edge 19 of the inner circumference of the upper metal fitting 13 as shown in FIG. The lower side of the female screw thread 20 on the inner circumference of the drawer rod 1 and the upper side of the screw thread 21 of the male thread 15 are crimped together as shown in a.
4 together with the lock nut 17, and insert the thread 21 of the male screw 15 above the thread 22 of the lock nut 17.
Crimp the lower side as shown in b.

FIG. 3 shows another embodiment in which the inner circumferential surface 23 of the fixing fitting 16 is tapered to the lower floor, and the conductor pull-out rod 14 is provided with the inner circumferential surface 23.
3 is provided, and when the fixing fitting 16 is tightened downward with the tightening bolt 18, a downward tightening force is applied to the pull-out rod 14 due to the pressure bond between the inner circumferential surface 23 and the tapered surface 24. be.

〔effect〕

As described above, this invention provides a conductor drawer in which a conductor pull-out rod is passed through the upper metal fitting firmly fixed to the upper part of the tube, and the fixing metal fitting fixed to the conductor pull-out rod is fixed to the upper metal fitting with a plurality of tightening bolts. The rod fixing structure has been improved so that a lock nut screwed onto the male screw of the conductor pull-out rod is inserted into the upper part of the fixing metal fitting through the conductor pull-out rod by the tightening action of the tightening bolt of the fixing metal fitting. Since it is crimped onto the metal fitting, a large fixing force can be obtained with less tightening force than with conventional configurations.

In other words, when tightening the tightening bolts with an appropriate gap left between the lock nut and the fixing metal fitting, for example, if the tightening bolts are four MI OX bolts, it is possible to tighten the bolts without causing problems in terms of work and stress. Torque 150kg-c
When tightened with m, the total axial force will be about 3000 kg, and the loosening torque will be about 3 times as much.Moreover, the tightening force for each bolt is relatively small, so the tightening work is extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of the same essential parts, FIG. 3 is a partially cutaway longitudinal sectional view showing another embodiment, and FIG. The figure is a partially cutaway vertical front view showing a conventional example. 11...Tunnel pipe, 12...Fixing bolt, 13...Upper metal fitting, 14...
・Conductor pull-out rod, 15... Male screw, 16.
...Fixing bracket, 17...Lock nut, 18...Tightening bolt, 23...Tapered inner peripheral surface, 24...Tapered surface . Same Agent Sickle 1) Sentence 2 Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) In a conductor pull-out rod fixing structure in which the conductor pull-out rod is passed through an upper metal fitting firmly fixed to the upper part of the tube, and the fixing metal fitting fixed to the conductor pull-out rod is fixed to the upper metal fitting with a plurality of tightening bolts, To be located at the bottom of the above fixing bracket,
A conductor pull-out rod for a power cable, characterized in that a lock nut screwed onto a male thread of the conductor pull-out rod is crimped to an upper metal fitting via the conductor pull-out rod by the tightening action of a tightening bolt of the fixing metal fitting. Fixed structure. (2) The conductor pull-out rod fixing structure for a power cable according to claim 1, wherein the conductor pull-out rod and the fixture are fixed by screwing together a male screw and a female screw. (3) The power cable according to claim 1, wherein the conductor pull-out rod and the fixing fitting are fixed by crimping the tapered surface provided on the conductor draw-out rod and the tapered inner circumferential surface of the fixing fitting. Conductor pull-out rod fixed structure.