JPS60225386A - Earth leading device for wiring duct - 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 [Technical Field] The present invention relates to a grounding device for a wiring duct.

[Background technology]

A conventional example is shown in FIG. 8 and FIG. 9. That is, the inner and outer surfaces of a core 30 made of a steel plate are coated with an insulator 31, and conductors 32 and 33 are arranged on both sides of the duct so as to face each other left and right, and on the upper surface of the central part of the duct. An exposed portion 34 of the core 30 is provided over the entire length of the duct, and the ground electrode 36 of the plug 35 is pressed against the exposed core portion 34.
By rotating the hook 37, the plug 35 was attached to the groove edge 38, and the plug blade 39 was brought into contact with the conductor 32, 33.

However, since the upper surface inside the duct is used as a grounding electrode, there is a drawback that a conductor cannot be placed on the upper surface. Also, if the number of conductors is odd, such as in a 3-phase 3-wire system, if the conductors are placed on both sides of the duct, they will be asymmetrical.
The contact pressure of the plug blade becomes unbalanced, and there is a dead space on one side, which is unreasonable. Furthermore, if the ground electrode is placed in the center of the plug, there will be less storage space for the plug blade, and there will be structural design constraints (it will be difficult to secure the insulation distance inside the plug).

Another possible conventional example is a duct made of steel plate without insulation coating, but in the case of steel plate, all the metal parts are exposed, so there is a risk of electric shock if you touch the duct if dust accumulates and leaks. be.

[Purpose of the invention]

An object of the present invention is to provide a wiring duct grounding device that allows easy grounding without restricting the number of conductors and their arrangement, and also allows for a simple plug structure.

[Disclosure of the invention]

The wiring duct grounding device of the present invention coats the wiring duct with insulation on the inner and outer surfaces of a metal core, and forms a longitudinally extending protrusion on the edge of the open groove, exposing the tip of the protrusion. On the other hand, the plug is characterized in that the protruding portion is held between the hooking piece and the upper surface, and a ground contact portion is provided on the contact surface of the protruding portion. Therefore, grounding can be easily achieved without any restrictions on the number and arrangement of conductors inside the wiring duct, and the plug structure can also be simplified.

An embodiment of the present invention will be described based on FIGS. 1 to 7. That is, the wiring duct l-1 has a substantially channel-shaped cross section, and has a core 2 formed of a steel plate whose inner and outer surfaces are covered with an insulator 3. The extending inwardly bent portion 6 is bent, and the tip of the bent portion 6 is exposed. There is a conductor holding part 7 inside the insulator 3.
protrudes inward, and attaches the conductors 3a and 8b to the tips of the conductor holding portion 7.
.

9a to 9C are arranged. Among these, the conductor 9a on the back side ~
9c is for high capacity and is conductor F3a on the open groove side.

8b is for low capacity.

Plug IO is for high capacity and case 11. cover 12
and a plug body 13, the plug body 13 is provided with a metal frame 14 on its upper surface, a plug blade holder 15 is protruded from a hole in the center of the metal frame 14, and three plug blades 16a to 16C are extended from the upper end thereof, Further, a pair of metal hook pieces 17a, 17b are horizontally extended from the base of the blade holder 15 in the same direction as the blades 16a, 16b. Bung blade 1
6C is configured to be freely retractable and is biased in the projecting direction by a spring (not shown). Further, the metal frame 14 and the hook pieces 17a, 17b are electrically connected, and a ground terminal hole 18 is integrally formed at the end of the metal frame 14. 19 is each plug blade 16a to 16c and ground terminal hole 1
This is the cable connected to 8. This plug body 13 is attached to the case 11 with screws 2°, and the cover 12 is opened from the opening 21 to the plug blade holder 15 and the hook pieces 17a, 17.
It is attached to the plug body 13 with a screw 22 with the part b protruding.

FIG. 2 and FIG. 3 show the dimensional relationship in the mechanical attachment part, and show the hooking pieces 17a, 17b and the upper surface 23 of the cover 12.
, the distance H2 between the upper surface and the lowermost surface of the bending portion 6 of the wiring duct 1, and the thickness H3 of the wiring duct 1, H3<l(, <l(2).

FIG. 6 shows the inserted state of the plug, and FIGS. 1 and 7 show the plug connected state, including the plug blades 16a, 16b and the hook 1.
Insert the plug blade holder 15 into the inside through the opening groove 4 of the wiring duct 1 with the protruding directions of 7a and 17b parallel to the longitudinal direction of the wiring duct 1, and insert the plug with the plug blade 16c in contact with the conductor 9c. Rotate 1o 90 degrees. As a result, the plug blade 16a as shown in FIG.

16b is in pressure contact with each conductor 9a, 9b, and the hook piece 1
7a and 17b are engaged with the upper surface of the bent part 6 of the edge 5 of the open groove 4, and the bent part 6 is connected to the hooking piece 17a,
17b and the upper surface 23 of the cover 12.

In this way, the plug 1o is mechanically held in the wiring duct 1, and the plug blades 16a to 16c are connected to the conductors 9a to 9c.
Moreover, the core 2 of the wiring duct 1 and the ground terminal hole 18 are electrically connected via the hook pieces 17a, 17b and the frame 14.

Because it is configured in this way, it has the following effects. That is, (11) Since the hook pieces 17a and 17b of the plug 10 are supported by the bent part 6 of the edge 5 of the open groove 4 and form a support beam at both ends, the cable 19 is pulled and bending force is applied to the plug 10. Even if one side of the hook piece lifts up, the other side is securely in pressure contact, so the contact as a ground electrode is always stable and highly reliable.

(2) The plug 10 is installed by inserting the plug 10 into the open groove 4 of the duct 1 and rotating it 90 degrees. If the clamping gap of the plug hooking piece 37 was made equal to or smaller than the thickness of the duct opening groove edge 38 as shown in FIG. In this case, the initial state in which the plug 10 is rotated is H3<) (, so that the hook pieces 17a and 17b easily fit into the edge 5 of the wiring duct 1, and 90
In the installed state of degree rotation, H, < H2 and the upper surface of the bending part C is rounded, so the spring properties of the bending part 6 act and it can rotate without getting caught, and the contact effect of the grounding is reduced by the spring pressure of the cover. Stabilize.

(3) Since the ground electrode of the wiring duct 1 is provided on the edge 5, the plug IO plug blade structure is simplified, there is more space for storing the plug blade in the duct 1, and a plug blade structure with three or more poles is possible. become.

(4) Hooking piece 17a for connecting the plug 10 to the duct 1.

Since 17b is made of metal to serve as a grounding electrode, plug 10
This increases the strength of the mounting part and improves reliability.

Note that the bent portion 6 may be configured to protrude outward and provide a ground contact portion on the upper surface side of the cover or the plug body. Furthermore, although the low capacity plugs connected to the low capacity conductors 8a and 8b of the wiring duct 1 are not shown, the grounding structure is the same as described above except for the plug blade structure. Furthermore, the plug 10 without the plug blade 16c can also be used. Further, the bent portion 6 may be formed as a protrusion.

〔Effect of the invention〕

According to this invention, the number and arrangement of conductors in the wiring duct are not limited, and grounding can be easily established.
Moreover, there is an effect that the plug structure can be simplified.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an embodiment of the present invention when the plug is connected, Fig. 2 is an exploded view of the hook part, Fig. 3 is a cross-sectional view of the pull JJ) part, and Fig. 4 is a high-capacity plug. Exploded perspective view, Figure 5 is a perspective view, Figure 6 is a perspective view of the plug insertion process, Figure 7 is a perspective view.
The figure is a perspective view of the connected state, and Figure 8 is an exploded sectional view of the conventional example.
Figure 9 is a sectional view. l... Wiring duct, 2... Metal core, 4... Open groove, 5... Edge, 6... Bent part (projection), 8a,
8b. 9a-9C...Conductor, 10...Plug, 15...
Plug blade holder, 16a-16cm plug blade, 17a, 17b.
=Hatch piece (earth contact part), 23...Top surface □Figure 1 Figure 3 Figure 2 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A wiring duct in which the inner and outer surfaces of a metal core are insulated and a conductor is arranged inside, a protrusion extending in the longitudinal direction is formed on the core at the edge of an open groove, and the upper surface of the protrusion is exposed; A blade holder is protruded from the upper surface, and a hook piece is provided at a predetermined interval from the upper surface, and the blade holder and the hook piece are inserted into the groove and rotated 90 degrees to close the blade of the blade holder. a plug that is brought into contact with the conductor and a protrusion on the edge of the open groove is held between the upper surface and the hooking piece; and a ground contact portion provided on a contact surface of the protrusion of the plug. Equipped with a wiring duct grounding device.