JPS5854836Y2 - Conductor lead-in mechanism - Google Patents

Description

[Detailed description of the invention] The present invention relates to a conductor lead-in mechanism used when drawing an external conductor into a terminal box with a pressure-resistant packing structure. The present invention provides a novel conductor lead-in mechanism in which a mechanism, a locking mechanism, and a waterproof mechanism are integrated.

Conventionally, various types of lead-in mechanisms have been put into practical use, but they generally have drawbacks such as a large number of parts and a relatively large number of man-hours for assembly.

The present invention solves these drawbacks, and will be described in detail below with reference to the drawings.

Fig. 1 is a partially cutaway plan view showing the appearance of an embodiment of the present invention, Fig. 2 is a sectional side view of the main part of Fig. 1, Fig. 3 is a front view of Fig. 1, and Fig. 4 is a cross-sectional side view of the main part of Fig. 1. 2 is a cross-sectional view of the main part taken along line AA in FIG. 2, and FIG. 5 is a cross-sectional view of the main part taken along line BB in FIG.

In the drawing, 10 is a conductor, 20 is a protection tube for the conductor 10,
30 is a packing gland made of a tubular metal body; 40.
50 is a gasket, 60 is a packing, 70 and 80 are washers, 90 is a locking fitting for fixing the conducting wire 10 to the packing land 30, 100 is a terminal box, 110 is a cover made of a metal body formed in a cylindrical shape, 120 is a bolt.

The protection tube 20 is for protecting the conductor 10 from external damage, and has one end 21 connected to the end 3 of the packing gland 30.
A threaded groove is provided so as to fit with 2.

One end 31 of the packing gland 30 is formed as a first fitting part that fits into the conductor lead-in port 101 of the terminal box 100,
The other end 32 is formed as a second fitting portion that fits into the protection tube 20 as described above.

A predetermined gap L is provided between the outer periphery of the first fitting portion 31 and the terminal box end face 102 when the terminal box 100 is fitted and tightened.
The wrench-applying portion 33 is formed so as to maintain A, and the second fitting portion 32 side of this wrench-applying portion 33 is formed as a cylindrical portion 34 having an outer diameter smaller than that of the wrench-applying portion 33.

A portion of the cylindrical portion 34 has a notch 3 in the diametrical direction so as to form a conductor locking portion for locking the conductor 10.
5 is formed.

Further, on both sides of this notch 35, gaskets 40,
Annular grooves 36 and 37 are formed for fitting 50 therein.

Gasket) 40.50 is used to connect the packing gland 30 and the cover 110 while maintaining watertightness.

The packing 60 is inserted into the lead-in port 101 of the terminal box 100 by sandwiching washers 70 and 80 on both sides, and has a predetermined inner diameter so that an effective compression amount corresponding to the outer diameter of the conducting wire 10 can be obtained. use something

The locking fitting 90 is arranged in the notch 35 of the packing gland 30, and has mounting screws S, S at both ends.
The central portion 93 is formed into a substantially semicircular shape so that the conducting wire 10 can be pressed therein.

The conductor lead-in port 101 of the terminal box 100 is formed as a stepped through hole.

That is, a packing 60 and a washer 70 are installed on the outer wall side 101a.
．． A through hole for inserting the packing gland 30 is provided on the inner periphery of the end thereof as described above.
A threaded groove is provided to screw into the fitting portion 31 of the inner wall side 10.
1b is provided with a through hole large enough to allow the conducting wire 10 to be inserted therethrough.

Note that the end face 102 of the terminal box 100 is also provided with a screw hole 103 into which a bolt 120 is inserted.

The cover 110 is formed into a cylindrical shape so as to fit into the cylindrical portion 34 of the packing gland 30 and cover the notch 35 .

A part of the outer periphery of this cover 110 has an end [
A locking mechanism 111 is integrated so as to protrude from 33b and come into contact with the end surface of the terminal box 100, and a locking mechanism 112 for locking and fixing the cover 110 to the terminal box 100 is also integrated.

That is, the locking mechanism 112 is integrated with the tightening mechanism 111, and is provided with an insertion hole 113 for the bolt 120.

The opening end 113a of the insertion hole 113 is formed as a stepped hole so that the head 121 of the bolt 120 is embedded therein.

As the bolt 120, a bolt having a hexagonal hole in the head 121 is used.

Note that a locking mechanism 111 and a locking mechanism 1 protrude from the opposite end of the terminal box 100 of the cylindrical portion of the cover 110.
The length LB of 12 is set shorter than the thickness of the spanner that fits into the spanner hook portion 33.

In such a configuration, the conducting wire 10 is drawn into the terminal box 100 in the following manner.

First, connect the conductor 10, the protective tube 20, and the packing gland 30.
, the packing 60, the washer 70, 80, and the cover 110, and insert it into the lead-in port 101 of the terminal box 100.

Next, the first fitting portion 31 of the packing gland 30 is screwed into the lead-in port 101 of the terminal box 100.

Here, the spanner attachment part 33 of the packing gland 30 is
Since the first fitting part 31 is formed so as to maintain a gap when it is fitted and tightened to the terminal box 100, additional tightening can be performed as necessary, and the amount of compression of the packing 60 can be freely adjusted. Can be set to .

The conductive wire 10 is fixed within the terminal box 100 by such compression of the packing 60.

On the other hand, in the notch 35 of the packing gland 30, one wire
0 is not moved by external force, the conductor locking fitting 90 is attached and screwed through S1 and S2.

After fitting and tightening the packing gland 30 to the terminal box 100 in this way and pressing the conductor 10 to the packing gland 30, the cover 110 is fitted onto the cylindrical part 34 so as to cover the notch 35 of the packing gland 30, Pol l-1
It is fixed to the terminal box 100 via 20.

As a result, the notch 35 of the packing gland 30 is waterproofed, the packing gland 30 is prevented from loosening, and the packing gland 30 is locked.

After attaching the cover 110 in this way, the protective tube 2
0 is screwed and fixed to the second fitting portion 32 of the packing gland 30.

As explained above, according to the present invention, the amount of compression of the pressure-resistant packing part can be set to one peak, and a wire drawing mechanism in which a locking mechanism, a locking mechanism, and a waterproofing mechanism are integrated can be realized.

Further, according to the present invention, since the locking mechanism, locking mechanism, and waterproofing mechanism are integrated into the cover, the number of parts can be reduced and loss of parts during work can be prevented.

Furthermore, according to the present invention, a spanner cannot be fitted into the spanner part of the packing gland unless the locking mechanism is loosened, so it is possible to accidentally loosen the packing gland while the locking mechanism is fixed. It can also be prevented, and its practical effects are great.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view showing the appearance of an embodiment of the present invention, Fig. 2 is a sectional side view of the main part of Fig. 1, Fig. 3 is a front view of Fig. 1, and Fig. 4 is a cross-sectional side view of the main part of Fig. 1. 2 is a cross-sectional view of the main part taken along line AA in FIG. 2, and FIG. 5 is a cross-sectional view of the main part taken along line BB in FIG. 10...Conducting wire, 20...Protection tube, 30
...Patsuking Land, 40,50...
・Gasket, 60...Putskin, 70°80
...Washer, 90 ...Latching metal fitting, 100
...Terminal box, 110 ...Cover, 12
0...Bolt.

Claims (1)

[Scope of utility model registration request] It is made of a tubular metal body, has a first fitting part formed at one end that fits into the conductor inlet of the terminal box, and a second fitting part which fits into the conductor protection tube at the other end. A wrench gripping portion is formed on the outer periphery near the fitting portion so as to maintain a predetermined gap between the terminal box and the end face of the terminal box when the terminal box is fitted and tightened, and the wrench gripping portion is on the second fitting portion side. is formed as a cylindrical part with an outer diameter smaller than the spanner part, and a part of this cylindrical part is formed with an approximately diametrical notch so as to constitute a conductor locking part, and on both sides of this notch part, It consists of a packing gland in which annular grooves are formed for fitting gaskets, and a metal body formed in a cylindrical shape to fit into the cylindrical part of the packing gland and cover the notch. A locking mechanism is integrated into the terminal box so that it faces a part of the cut surface of the spanner part of the packing gland and protrudes from the end face of the spanner part in a predetermined fitted state, and is fixed to the terminal box. A conductor lead-in mechanism including a cover with an integrated locking mechanism for locking the wire.