JPH0223988B2 - - Google Patents

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. 7 and FIG. 8. That is, a conductor 31 is supported via an insulator 32 in a metal case 30 formed into a substantially channel-shaped cross section, a plug 33 is attached to this duct, and the metal case 3
0 through a hook 36 of a plug 33. 34 is a plug blade.

However, since the opening groove edge 35 of the case 30 to which the plug 33 is attached and the hooking piece 36 of the plug 33 are flat surfaces, if insulating dust or foreign matter adheres to the opening groove edge 35, the opening groove edge 35 and the hooking piece 36 are flat surfaces. Part 36
There was a drawback that insulating foreign matter was interposed between the two, making it easy for poor grounding contact to occur.

[Object of the Invention] An object of the present invention is to provide a wiring duct grounding device that can ensure grounding even if dust, foreign matter, etc. adhere to the groove edges.

[Disclosure of the invention]

In the wiring duct grounding device of the present invention, a protrusion is formed inside the edge of the opening groove of the wiring duct, and a conductor is arranged deep inside, while the plug has a spring that presses the plug blade against the conductor. The feature is that the grounding/hanging piece is secured to the protrusion by the spring action of the support. The hook slides on the protrusion and becomes locked, so even if dust or the like accumulates on the protrusion, it can be rubbed off and come into contact with the protrusion, ensuring a secure grounding.

An embodiment of the present invention will be described based on FIGS. 1 to 6. That is, the wiring duct 1 has a substantially channel-shaped cross section, and the inner and outer surfaces of a case 2 made of a steel plate are covered with an insulator 3, and the inner and outer surfaces of the case 2 formed of a steel plate are coated with an insulator 3, and the inner and outer surfaces of the case 2 extending in the longitudinal direction of the case 2 are formed at the edge 5 of the open groove 4. The bent portion 6 is bent, and the tip of the bent portion 6 is exposed. Inside the insulator 3, a conductor holding part 7 protrudes inward, and at the tip of the conductor holding part 7, conductors 8a, 8 are attached.
b, 9a to 9c are arranged. Among these, the conductors 9a to 9c on the back side are for high capacity, and the conductors 8a and 8b on the open groove side are for low capacity.

The plug 10 is for high capacity and consists of a case 11, a cover 12, and a plug body 13.The plug body 13 has a metal frame 14 on its upper surface, and a plug blade holder 15 protrudes from a hole in the center of the metal frame 14. Three plug blades 16a to 16c extend from the upper end, and a pair of metal hook pieces 17a, 17b extend horizontally from the base of the plug blade holder 15 in the same direction as the plug 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 16
These are cables connected to a to 16c and the ground terminal hole 18. This plug body 13 is case 1
1 with screws 20, and the cover 12 is attached to the blade holder 15 and the hook piece 17a through the opening 21.
17b and attach the plug body 13 with the screw 22.
mounted on.

FIG. 6 shows the plug inserted state, and FIG. 1 shows the plug connected state, and the plug blade holder 15 is set with the protruding directions of the plug blades 16a, 16b and hook pieces 17a, 17b parallel to the longitudinal direction of the wiring duct 1. Wiring duct 1
The plug blade 16c is inserted into the opening groove 4, and the plug blade 16c is inserted into the opening groove 4.
The plug 10 is rotated 90 degrees while being in pressure contact with the conductor 9c facing the conductor 9c against the spring. As a result, as shown in FIG.
At the same time, the hook pieces 17a and 17b are engaged with the upper surface of the bent part 6 of the edge 5 of the open groove 4 by the action of the spring of the plug blade 16c. Thus plug 10
is mechanically held in the wiring duct 1, and the plug blades 16a to 16c are connected to the conductors 9a to 9c, and the core 2 of the wiring duct 1 and the ground terminal hole 18 are connected to the hook pieces 17a, 17b and the frame 14. An electrical connection is made through the

This configuration provides the following effects. That is, (1) the pressing force by the spring of the plug blade 16c of the plug 10 acts as a reaction force on the hook pieces 17a, 17b, and the bent portion 6
This stabilizes the grounding resistance and improves the reliability of grounding.

(2) Since the contact area between the plug 10 and the duct 1 that serves as grounding and attachment is the bent part 6 of the tip R, it is a point contact and this point receives the contact pressure of the plug blade 16c, so there is no insulating foreign material intervening. However, since the high load is concentrated on the R portion of the tip, there is no risk that insulating foreign matter will be thrown out of the bent portion 6 and cause a contact failure.

(3) Since the plug 10 is inserted by rotation, even if the surface is oxidized, the oxide (rust, etc.) is removed by rubbing during rotation, resulting in good contact.

Although the low-capacity plug is not shown, it is configured so that a protrusion that presses against the conductor 9c is supported by a spring (the same configuration as the plug blade 16c may be used), and the plug blade that contacts the conductors 8a and 8b All you have to do is set it up.
Further, the bent portion 6 does not need to have a bent shape as long as it is formed into a protrusion.

〔Effect of the invention〕

According to this invention, even if dust, foreign matter, etc. adhere to the groove edges of the wiring duct, the grounding can be ensured.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a plug connected state according to an embodiment of the present invention, Fig. 2 is a sectional view of a hook portion, Fig. 3 is a sectional view of a wiring duct, and Fig. 4 is an exploded perspective view of a high capacity plug. , FIG. 5 is a perspective view, FIG. 6 is a perspective view of the plug insertion process, and FIG. 7 is an exploded sectional view of the conventional example.
FIG. 8 is a sectional view. 1...Wiring duct, 2...Metal case, 4...
... Open groove, 5 ... Edge, 6 ... Bent part (projection),
8a, 8b, 9a-9c...Conductor, 10...Plug, 15...Blug blade holder, 16a-16c...Blug blade, 17a, 17b...Grounding/hanging piece.

Claims (1)

[Claims] 1. A wiring duct that has a protrusion formed inside the edge of the opening groove of a metal case and has a conductor arranged at least in the inner depth facing the opening groove, and a wiring duct that is inserted through the opening groove and comes into contact with the conductor. A grounding device for a wiring duct, comprising a plug blade that presses the plug blade, and a plug that has a spring that presses the plug blade and a grounding and hooking piece that locks onto the protrusion by the spring when rotated 90 degrees.