JPH0329894Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a jack in which a plug insertion/extraction part is formed integrally with a body as a molded product, and a metal cylindrical body is fitted into the plug insertion/extraction part.

``Prior art'' In a jack in which the plug insertion/extraction part is constructed as a molded product integrally with the body, the metal cylindrical body attached to the plug insertion/extraction part is mainly for decoration, and the cylindrical body is not grounded. There are many cases.
However, since this cylindrical body is not grounded, it is charged with static electricity, and when the plug is inserted, this static electricity is transmitted to the plug side, which may cause damage to the electrical circuit connected to the plug.

From this point of view, when this cylindrical body is grounded through a grounding piece, conventionally the grounding piece is attached to the cylindrical body by caulking. Due to this fixed connection method, the shape of the body and ground contact piece was restricted, and it could only be applied to large jacks.

``Means for solving the problem'' In this invention, an opening is formed in the direction perpendicular to the plug insertion/extraction direction near the insertion/extraction part of the body, and an elastic metal plate is bent into a U-shape from the opening for grounding. The contact piece is inserted, the opening is almost closed, the shaped surface is almost perpendicular to the plug insertion/extraction direction, and the plug insertion/extraction hole is surrounded, and the grounding contact piece and the inner end of the cylindrical body are elastic. are contacted and electrically connected to each other. A terminal integrated with this grounding contact piece is led out to the outside of the body.

``Example'' An example of this invention will be described below with reference to the drawings. As shown in FIG. 1, the body 11 has a rectangular parallelepiped shape with a low height in this example, and a cylindrical plug insertion/extraction part 12 integrally protrudes forward from the front surface of the body 11. These body 11 and plug insertion/extraction part 12 are constructed as molded products of synthetic resin material. A metal cylindrical body 13 is fitted onto the inner peripheral surface of the plug insertion/extraction part 12 .

Inside the body 11, for example, as shown in FIG.
A U-shaped tip contact piece 15 is inserted along the side plate 16, and three contact pieces 17, 18, 1 are inserted along the other side plate 16.
9 are inserted in such a way that they face each other one after another and are arranged on the center side. The contact pieces 17, 18 are always in contact, the contact piece 18 is short, the ends of the contact pieces 17, 19 are opposed to each other, and an insulating piece 21 is arranged between them. When the plug 22 is inserted into the body 11 through the cylindrical body 13, the contact portion of the tip contact piece 15 elastically contacts the tip, and the contact portion of the contact piece 19 elastically contacts the ring, and the displaced insulation is removed. The contact piece 17 is displaced via the piece 21, and the contact between the contact pieces 17 and 18 is broken.

In this invention, an opening 2 is provided in the upper plate 23 of the body 11 between the body 11 and the plug insertion/extraction part 12.
4 is formed as shown in FIGS. 1 and 3, and a ground contact piece 25 is inserted and fixed into the body 11 through this opening 24. The grounding contact piece 25 is made by bending an elastic metal plate into a U-shape, and the surface of the U-shape is approximately perpendicular to the plug insertion/extraction direction. contacted elastically.

The ground contact piece 25 substantially closes the opening 24 and is automatically locked to the body 11 when inserted into the body 11. For this reason, an engaging piece 26, a contact piece 27, and engaging pieces 28, 29 are integrally formed, respectively, protruding from both side edges of the U-shaped intermediate portion 25c.
The contact pieces 28, 29 and 27 are slightly bent inwardly or outwardly, and the engaging pieces 26, 28, 29 are shaped like right triangles, with their vertical sides located on the opening 24 side.

On the other hand, the engagement groove 3 into which the engagement piece 26, the contact piece 27, and the engagement pieces 28, 29 are inserted and engaged with the body 11
1 and 32 are formed, and an engagement piece and a contact piece are press-fitted into these engagement grooves 31 and 32. The contact piece 27 is pressed against the outer peripheral surface of the inner end of the cylindrical body 13, and the engagement piece 2
6, 28, and 29 are mutually engaged with engagement grooves 31 and 32, respectively.

Note that a contact piece main body 33 is integrally extended rearward from the center of the rear edge of the leg portion 25a so as to come into contact with the ground ring of the inserted plug. Further, a terminal 34 is bent and extended downward from the center of the rear edge of the leg portion 25b, and the terminal 34 projects downward through a hole formed in the bottom plate of the body 11.

"Effects of the Invention" As described above, according to the jack of this invention, the U-shaped ground contact piece 25 is connected to the opening 24 of the body 11.
Electrical connection with the cylindrical body 13 is automatically established when the cylindrical body 13 is inserted and fitted. Terminal 3 of this grounding piece 25
By grounding 4, the cylindrical body 13 can be prevented from being charged with static electricity. Moreover, since the grounding contact piece 25 can be attached to the body 11 and connected to the cylindrical body 13 very easily and does not take up much space, it can also be applied to a small jack.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the jack according to this invention, Fig. 2 is a horizontal sectional view of the jack shown in Fig. 1, and Fig. 3 shows the body 11, cylindrical body 13, and ground contact piece of the jack shown in Fig. 1. 25 is an exploded perspective view. 11: Body, 12: Plug insertion/extraction part, 13: Cylindrical body, 24: Opening, 25: Grounding contact piece, 27: Contact piece.

Claims (1)

[Scope of Claim for Utility Model Registration] When a plug is inserted into or removed from the plug insertion hole of the body 11 made of a molded article of an insulating material, the body 11
In the jack in which the inner contact piece is driven and the metal cylindrical body 13 is fitted to the inner peripheral surface of the plug insertion/extraction part 12, on the upper surface of the body 11 near the cylindrical body 13,
An opening 24 is formed in a direction perpendicular to the plug insertion/extraction direction, and engagement grooves 31 and 32 are formed continuously from one side of the opening 24 downward from the upper surface of the plug insertion/extraction part 12 and the body 11, and the elasticity A grounding contact piece 2 is made by bending a metal plate into a U-shape, and integrally protruding engagement pieces 26 and 28 on both sides of the middle part 25c of the U-shape, and a contact piece 27 on one side edge.
5 is press-fitted into the body through the opening 24, and the grounding contact piece has a U-shaped surface substantially perpendicular to the plug insertion/extraction direction, and a U-shaped plate surface bent in the plug insertion/extraction direction. The engaging pieces 26, 28 and the contact piece 27 are press-fitted into the engaging grooves 31, 32 while surrounding the plug insertion/extraction hole in parallel, and the contact piece 27 is in elastic contact with the cylindrical body 13; A jack in which a terminal 34 integrated with the grounding contact piece 25 is led out of the body 11.