JPH0228635Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a wiring duct plug intended for earthing structures.

[Background technology]

Conventionally, when grounding a wiring duct, a grounding contact piece such as a grounding plug blade or an electrode that contacts the grounding part of the wiring duct, and a grounding terminal to which a lead wire is connected are each attached to the plug body, and the grounding terminal and grounding contact piece is attached to the plug body. The two halves were connected using conductive metal fittings or lead wires.

However, as the number of electrical and mechanical parts constituting the grounding circuit increases, the number of electrical contact points increases, and the reliability of grounding decreases.

[Purpose of invention]

The purpose of this invention is to provide a wiring duct plug that can reduce the number of parts and improve grounding reliability.

[Disclosure of invention]

The wiring duct plug of this invention includes a plug body having a through hole, a grounding contact piece supported at one end of the through hole and in contact with a grounding part of the wiring duct, and an earth contact piece on the other end of the through hole. and a ground terminal supported by the plug body and attached to the plug body in a sandwiched state together with the ground contact piece by passing through the through hole and caulking the ground contact piece. In other words, the conventional lead wires or contact metal fittings and their connection screws that connect the ground contact piece and ground terminal are no longer necessary, and the number of electrical and mechanical parts that make up the ground circuit is reduced, as well as the number of electrical contact parts. Therefore, reliability can be improved.

An embodiment of this invention will be explained based on FIGS. 1 to 11. In the figure, 1 is a case of the plug body, 2 is a terminal block of the plug body, and the terminal block 2 forms a plug blade support cylinder 5 in the center by joining a pair of approximately symmetrical insulators 3 and 4. A pair of flanges 6 and 7 are provided on the lower side of the blade support cylinder 5 to protrude in opposite directions. An engagement gap 9 is formed between the flange portions 6 and 7 and the base surface 8. Further, grooves 10 are formed in the joint surfaces of the insulators 3 and 4, and a pair of blades 11 are inserted into the grooves 11, which are held between the insulators 3 and 4 and connected to the flanges 6 and 7 from the upper side of the blade support cylinder 5. protruding in the same direction. A terminal screw 12 is attached to the base end of the plug blade 11.
has been established. Further, a recess 13 is formed on the side facing the locking surface 7a of the flange portion 7, that is, the gap 9 with the base surface 8.
An earth spring 14 serving as an earth contact piece is located in the recess 13, and a contact protrusion 1 is provided at the tip of the earth spring 14.
5 and the base end 14a of the ground spring 14.
extends through the Z-shaped bent portion 16 and forms a mounting hole 17 in the center thereof. This base end 14a is a notch 5 near the base of the blade support cylinder 5 of the insulator 4.
Place the ground terminal 19 at the position of the through hole 18 formed in FIG. The joint portion 19a is brought into contact with the base end portion 14, and the caulking pin 20 formed by tapping the earth terminal 19 is passed through the mounting hole 17 and caulked, thereby fixing the earth terminal 19 and the spring 14 to the insulator 4 in a sandwiched state. ing. The ground terminal 19 is provided with a terminal screw 21 . A lead wire 22 is connected to the terminal screws 12 and 21,
The lead wire 22 is passed through the center hole (not shown) at the bottom of the plug body 1, and the combined insulators 3 and 4 are inserted into the plug body 1 and fixed to the mounting hole 24 of the body 1 with screws 23. .

10 and 11 show a state in which plug A is connected to wiring duct B. FIG. That is, the flanges 6, 7 and the plug blade 11 are inserted into the duct housing 25 with their protruding directions parallel to the longitudinal direction of the open groove 26 of the metal duct housing 25, so that the base surfaces 8 of the insulators 3, 4 are aligned. Rotate the duct A by 90 degrees while it is in contact with the lower surface of the duct housing 25. As a result, as shown in Figs. 10 and 11, the plug blade 1
1 contacts the conductor 27 of the wiring duct B, the flanges 6 and 7 engage with the inner surface of the open groove edge 28 of the duct housing 25, and the open groove edge 28 engages with the gap 9. At this time, the contact protrusion 15 of the earth spring 14 comes into elastic contact with the inner surface of the open groove edge 28, and the earth spring 14 is elastically deformed so as to escape into the recess 13.
The details of the operation in this case are that the bottom surface of the recess 13 is inclined, and the proximal bent portion 16a of the ground spring 14 comes into contact with the upper edge of the inclined surface 13a, and uses this position as a fulcrum as shown in FIG. It is inclined along the inclined surface 13a. On the other hand, when removing the plug A, it is sufficient to rotate the plug A by 90 degrees so that it is parallel to the longitudinal direction of the opening of the plug blade 11, etc.

With this configuration, the grounding circuit of plug A consists of the grounding spring 14, the grounding terminal 19 attached to the caulking pin 20, the terminal screw 21, and the lead wire 22, which simplifies the circuit configuration compared to the conventional one and reduces electrical contact. There are few places. Furthermore, since the earth spring 14 and the earth terminal 19 are fixed to the plug body 1 by crimping the crimping pin 20, the number of mechanical parts is reduced compared to the conventional case, and the structure is simple and the fixing is reliable. As a result, the reliability of the grounding circuit is improved compared to the conventional one.

Note that the caulking pin may be provided on the ground spring 14 side.

[Effect of idea]

According to this invention, by caulking the earth contact piece and the earth terminal and attaching them to the plug body, the number of electrical and mechanical parts constituting the earth circuit is reduced and reliability can be improved.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of one embodiment of this invention, Figure 2 is a partially exploded perspective view, Figure 3 is a plan view, Figure 4 is a sectional view with the plug body removed, and Figure 5 is a side view. Figure 6 is its front view, Figure 7 is its bottom view, Figure 8 is its front view, Figure 9 is its side view, and Figure 1 is its front view.
Figure 0 is a sectional view of the wiring duct in an installed state, and Figure 11 is a partially cutaway side view of the wiring duct as viewed from the front. 1...Plug body, 14...Earth spring (earth contact piece), 18...Through hole portion, 19...Earth terminal, 20...Crimping pin, 25...Duct housing (earth part), A...Plug , B...Wiring duct.

Claims (1)

[Scope of utility model registration request] a plug body having a through hole; a grounding contact piece supported at one end of the through hole and contacting a grounding portion of the wiring duct; and a grounding contact piece supported at the other end of the through hole and passing through the through hole. A plug for a wiring duct, comprising a ground terminal that is attached to the plug body in a sandwiched state together with the ground contact piece by caulking the ground contact piece.