JPH055664Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a plug having a built-in noise filter element that attenuates noise signals superimposed on a power supply line.

[Conventional technology]

The structure, quality, etc. of power plugs are regulated according to the power supply conditions and standards of each country, and they are manufactured and used based on the content of the regulations. For example, European CEE standard standard sheet #7
TWO-POLE with 250V-10/16A capacity in
PLUG WITH DUAL EARTHING−
The shape and dimensions of the plugs found in CONTACTS (1963 regulations) are specified in detail, with an emphasis on human safety.

Figure 4a shows this insertion plug, which includes a plug body 1 with recesses 2, 2 formed on the top and bottom of the outer surface of the tip, and protrusions 3, 3 formed in parallel at positions orthogonal to the recesses 2, 2, respectively. The plug main body 1 has a cord protection portion 4 integrally connected to the rear end thereof. One end of a cord 10 is connected to a device (not shown) in the cord protection part 4, and the other end of the cord 10 is introduced into the plug body 1. The plug body 1 and the cord protection portion 4 are integrally molded from plastic such as vinyl chloride resin. A pair of round pin-shaped plug terminals 5, 5 protrude from the tip surface of the plug body 1, and an earth pin holder 8 is provided in the hole formed in the tip surface, and is integrated with the earth pin holder 8. The ground plate 7 is disposed within the recess 2 so that the ground plate 7 is exposed. The cord 10 consists of one grounding wire core and two cord cores twisted together and wrapped in an outer sheath.
It is beginning to be introduced within the country. Due to safety standards, it is necessary to provide an insulating base 13 within the plug body 1, on which the plug terminals 5, 5 are fixed, as shown in FIG. 4b. The insulating base 13 is made of heat-resistant plastic such as PBT resin so as to have a rectangular outer shape, and a guide groove 14 into which the cord core of the cord is inserted is formed on both sides. 14 is connected to a plug terminal 5 having a connecting part 6 to which a conductor of the cord core (hereinafter, description of "conductor" is omitted) is connected. Further, the ground plate 7 is fitted onto the insulating base 13. The grounding plate 7 is bent into a "U" shape by punching and pressing a metal conductive plate, and a connection terminal 9 to be connected to the grounding core of the cord 10 is cut and raised in a part of the grounding plate 7. There is. On both sides of the insulating base 13 on which the ground plate 7 is fitted, protrusions 15 for restricting movement of the ground plate 7 are formed facing each other. To form the plug as described above, after fitting the ground plate 7 to the insulating base 13 that fixes the plug terminal 5, insert the cord core of the cord 10 into the connection part 6 of the plug terminal 5, and then insert the cord core of the cord 10 into the connection part 6 of the plug terminal 5. The ground core of the cord 10 is connected to the connection terminal 9, and in this state the whole is set in the mold. Then, plastic molding is performed so as to bury the insulating base 13, and the outer shape is as shown in FIG. Here, the depth, width, and length of the recess 2, the height, width, and length of the projection 3, and the diameter, length, and
The placement position, the thickness/width, exposed dimensions/embedded dimensions of the ground plate 7, the thickness, inner diameter, depth, placement position, etc. of the ground pin holder 8 are stipulated with priority given to human safety. Yes, for this reason, the insulation base 13
has become an essential component.

It is possible to incorporate a noise filter element to prevent the intrusion of noise signals into plugs that meet these standards, but various improvements must be made due to the space occupied by the noise filter element, connection conditions, etc. There is. Figures 5 and 6 show the invention previously proposed by the applicant regarding this plug-in plug with a built-in noise filter element.
59378). The noise filter element 17 is constructed by winding a pair of insulated conductors 19 around an annular ferrite core 18 coated with an insulator. Then, from the pair of insulated conductors 19, there are four lead ends 2.
0 is pulled out, one lead end 20 of the pair of insulated conductors 19 is wound around a connecting plate 21, and the cord core 12 of the cord 10 is wound around this connecting plate 21, thereby forming a cord core. 12 and an insulated conductor 19 are connected. Such a noise filter element 17 is provided with an insulating cover 1 that is fitted together.
It is stored in 6. For this reason, the insulating cover 16 has a storage recess 3 in which the noise filter element 17 is stored.
0 is formed. Further, a guide leg 34 to be inserted into the guide groove 14 of the insulating base 13 extends from the lower end of the insulating cover 16, and a fixing groove 37 into which the connection plate 21 is fitted and fixed at the upper end. A cord tube 35 into which the cord 10 is inserted is formed. Further, a wire core guide groove 47 into which the ground wire core 11 from the cord 10 is inserted is formed on the outer surface of the one (right side) insulating cover 16. Incidentally, FIG. 6 shows an embodiment of the earth plate 7, in which an earth pin receiving fitting 8 is integrally formed with the earth plate 7.

The assembly of such a plug includes the lead end 20 of the noise filter element 17 and the cord 10.
Insert the connection plate 21 on which the cord core 12 is wound and connected into the fixing groove 37 of the insulating cover 16, store the noise filter element 17 in the storage recess 30, and close one (right side) insulating cover 16. Fit together. After inserting the guide leg 34 into the guide groove 14 of the insulating base 13, the two lead ends 20 of the noise filter element 17, which are free ends, are
is connected to the connection part 6 of the plug terminal 5, and the ground wire core 11 of the cord 10 is connected to the wire core guide groove 47.
and connect it to the connection terminal 9 of the ground plate 7.
Thereafter, the plug body 1 in which these are embedded is formed by plastic molding.

[The problem that the idea attempts to solve]

However, the above-described plug with a built-in noise filter element has the following problems.

(1) The insulating cover 16 is required to protect the noise filter element 17, and since the insulating cover 16 is arranged and assembled vertically on the insulating base 13, the plug body 1 is elongated in the axial direction of the cord 10. and increase in size.

(2) Since the plug body 1 is longer, the protrusion length of the plug is large when it is inserted into an outlet, and a large dead area around the outlet is required for this purpose.

(3) Larger plugs are subject to greater stress such as pressing force and prying force when connected to an outlet, which can lead to greater wear and tear on the socket blades of the outlet and the plug terminals of the plug.
Easy to deform.

(4) When connecting the lead end 20 of the noise filter element 17 to the connection part 6 of the plug terminal 5, the guide leg 34 of the insulating cover 16 is connected to the insulating base 13.
It is necessary to perform this operation while the connector is inserted into the guide groove 14 of the connector, and in such a state, the space is narrow, making the connection work difficult and making the connection unstable. The connection of the ground wire core 11 of the cord 10 to the connection terminal 9 of the ground plate 7 is similar, and the connection of the insulating cover 1
Under the assembled state of No. 6, it becomes a hindrance to the connection, and this becomes the bottleneck for improving the reliability of the connection.

(5) Due to the large size of the plug, costs are high and productivity is poor.

The object of the present invention is to solve the above-mentioned problems and provide an insertion plug that can be made smaller and easier to connect.

[Means for solving the problems]

In order to achieve the above object, the present invention is such that the noise filter element is housed by an insulating base and an insulating cover, and the ground terminal is formed so as to straddle the insulating cover and engage with the insulating base. . That is, each element in the present invention has the form and members shown below.

(1) Insulating base As required by the standards, it has a plug terminal that is connected to the noise filter element, and is designed to engage the ground terminal that is connected to the ground core of the cord. A support plate portion on which the noise filter element is placed is formed on this insulating base, and is formed to accommodate the noise filter element between it and an insulating cover, which will be described later.

(2) Insulating cover Used to protect the noise filter element. In this case, the insulating cover does not accommodate the noise filter element by itself, but is formed into a shape that accommodates the noise filter element between it and the support plate portion of the insulating base. Further, the insulating cover is engaged with the insulating base and integrated with the insulating base, and the ground terminal is engaged with the insulating base from above the integrated insulating cover. Further, the insulating cover is integrally provided with a connection terminal for connecting the cord core of the cord and the conductor of the noise filter element.

(3) Plug body This is a member that covers the insulating base, insulating cover, and one end of the cord, and is molded into a shape that meets the standards by integral molding of plastic.

[Effect]

In the above configuration, the noise filter element is housed between the insulating base and the insulating cover that are engaged with each other. Therefore, the noise filter element can be stored without forming a storage chamber for housing the noise filter element in the insulating cover. Furthermore, the ground terminal engages with the insulating base from above the insulating cover, reducing the space required for assembling the insulating cover.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 shows the external appearance of an insertion plug according to an embodiment of the present invention, and the same elements as those of the prior art are given the same reference numerals and correspond to each other. That is, the plug has a plug body 1 and a cord protection part 4 formed by molding of vinyl chloride resin, etc., and the terminal part of the cord 10 is introduced into the plug body 1 from the cord protection part 4. . Plug body 1
A pair of plug terminals 5, 5 protrude from the tip end surface, and an earth pin holder 8 is provided in the hole formed on the tip end surface. Further, on the outer surface of the tip of the plug body 1, there are recesses 2, 2 in the vertical direction.
Protrusions 3, 3 are formed on both sides of the position where the plug terminals 5, 5 are arranged, and a ground plate 7, which is integrated with the ground pin receiver 8, is provided in the recesses 2, 2 so as to be exposed. ing.

2 and 3 show members provided inside the plug body 1, and show an insulating base 100, an insulating cover 200, a ground terminal 300, and a noise filter element 400, respectively. Each member will be explained below based on FIG. 2.

The insulating base 100 includes a base 101 that supports the plug terminal 5, a support plate 102 that is connected to the back side of the base 101 so as to be parallel to the plug terminal 5, and
It has a shape that includes a box-shaped earth pin receiving fitting insertion part 103 that is continuously provided on the base 101 and rising piece parts 107 that are continuously provided on both sides of the support plate part 102 in an upright manner. A connecting portion 6 of the plug terminal 5 is located on the base 101, and a lead end of a noise filter element 400, which will be described later, is connected thereto. The support plate portion 102 is a portion on which the noise filter element 400 is placed, and is formed into a flat plate shape. The earth pin receiver insertion part 103 is a ground terminal 300 which will be described later.
A ground pin receiving fitting 8 is inserted along the inner surface. Therefore, the inner surface of the insertion portion 103 is formed to have substantially the same shape as the earth pin receiving fitting 8. A locking piece 106 that engages with a locking arm 211 of an insulating cover 200, which will be described later, is formed on the outer surface of the rising piece 107. The insulating base 100 and the insulating cover 200 are now assembled. The insulating base 100 is further formed with ground plate mounting surface parts 104 and 105 at upper and lower positions, with which the ground plate 7 of the ground terminal 300 is slidably engaged. The insulating base 100 having such a shape is
It is integrally molded with the plug terminal 5 from heat-resistant plastic such as PBT resin.

The insulating cover 200 accommodates the noise filter element 400 together with the insulating base 100.
0 electrically, thermally, and mechanically, and protects the top wall 201, side wall 204, and rear wall 2.
03 are integrally arranged in series to form a noise filter element 4.
A coating for the 00 coating is formed. In this case, the noise filter element 400 is
Since the part corresponding to the support plate part 102 and the insulating base 1
The surface facing 00 is open. Further, a lower wall portion 202 is connected to the lower part of the rear wall portion 203, and the earth plate 7 of the earth terminal 300 is provided on the lower wall portion 202.
A ground plate insertion piece part 206 is formed into which the ground terminal 300 is inserted, and a ground plate insertion piece part 206 into which the connecting part 302 of the ground terminal 300 is inserted is formed on the upper wall part 201.
5 is formed. Four cord holding pieces 207 divided by slits 212 extend rearward from the upper wall portion 201 and the rear wall portion 203. This code holding piece 207 is the code 1
This is to hold the terminal part of 0 from the surroundings to prevent it from coming off. Note that the lower ground plate insertion piece 206
Projections 208 are formed on both sides of the ground plate 7 to prevent lateral movement of the ground plate 7. 209 is the rear wall portion 20
These are a pair of connection terminals made of a conductor provided so as to protrude rearward from 3, and are used for connecting the cord core 12 of the coat 10 and the lead ends 403A, 404A of the noise filter element 400. Such an insulating cover 200 has an insulating base 1
The locking arm 2 is assembled in an engaged state with the locking arm 2 that engages with the locking piece 106 of the insulating base 100.
11 are formed on both side wall portions 204. Also,
The side wall portion 204 has lead-out grooves 2 from which lead ends 403A and 404A of the noise filter element 400 are led out.
10 are formed. The insulating cover 200 as described above is integrally molded from plastic such as PBT resin or polyamide resin.

The ground terminal 300 is formed into the shape shown in FIG. 2 by punching and pressing a metal conductive plate. This earth terminal 300 includes a pair of upper and lower earth plates 7 and a pair of earth pin receivers 8 extending in the same direction as the earth plate 17 on both sides of the upper earth plate 7. In this case, the surface including the ground pin holder 8 is the ground plate 7.
It is formed to be perpendicular to the plane containing. The upper and lower grounding plates 7 are connected to each other through a base 301, a connecting portion 302 that is bent forward at right angles from the base 301 and connected, and a rising portion 303 that is connected upwardly from the connecting portion 302 at right angles. They are installed consecutively. 304 is a terminal cut and formed from the continuous portion 302, to which the ground wire core 11 of the cord 10 is connected. Note that the tip of each ground plate 7 is bent with an obtuse taper to form an insulating base 100.
The elastic engagement force is strengthened. Also,
The earth pin holder 8 is somewhat shorter than the earth plate 7.

The noise filter element 400 includes an annular ferrite core 401 covered with an insulator, and this core 40.
1, a pair of insulated conductors 402 are wound with a predetermined number of turns.
The pair of insulated conductors 402 each have a lead end 403, 403A, 404, 404A. Here, the lead ends 403 and 404 are connected to the connection part 6 of the plug terminal 5, and the lead ends 403 and 404 are connected to the connection part 6 of the plug terminal 5.
03A and 404A are connection terminals 209 of the insulating cover 200 that are connected to the cord core 12 of the cord 10. This type of noise filter element is called a chiyoke coil, and the chiyoke coil can be used alone or in combination with a chiyoke coil and a capacitor.

Next, the assembly will be explained.

The lead ends 403 and 4 of the noise filter element 400 are connected to the connection part 6 of the plug terminal 5 of the insulating base 100.
04 and place the noise filter element 400 on the support plate section 102. Then, the lead ends 403A and 404A of the noise filter element 400 are led out from the lead-out groove 210 of the insulating cover 200,
Assemble the insulating cover 200 to the insulating base 100. This engagement is reliably performed by the locking arm 211 and the locking piece 106, and the noise filter element 400 is housed between the insulating base 100 and the insulating cover 200. Thereafter, the ground terminal 300 is inserted between the cord holding pieces 207 of the insulating cover 200, and the grounding plate 7 is placed on the insulating base 10 from above the insulating cover 200.
It is attached by slidingly contacting the ground plate mounting surface parts 104 and 105 of 0. At this time, the earth pin receiver 8 is inserted into the earth pin receiver insertion part 103 and fitted. Then, attach the cord 10 to the cord holding piece 207.
and connect the cord core 12 and the lead ends 403A and 404A of the noise filter element 400 to the connection terminal 209. During this connection, the cord core 12 is inserted into the slit 212 between the cord holding pieces 207.
It is derived from Further, the ground wire core 11 of the cord 10 is connected to the terminal 304 of the ground terminal 300. Then, an insulating base 100 and an insulating cover 20
0. A plug body 1 (FIG. 1) is formed by integrally molding plastic such as vinyl chloride resin so as to cover the ground terminal 300 and the end of the cord 10.

Since the plug having such a structure accommodates the noise filter element 400 through the insulating base 100 and the insulating cover 200, there is no need to form a storage part for accommodating the noise filter element in the insulating cover. Dimensions can be reduced. In addition, the ground terminal 300 is connected to the insulating cover 200.
Since it engages with the insulating base 100 while straddling the insulating base, the space required for assembling the insulating base is reduced. Furthermore, the noise filter element 400
A connection terminal 209 for connecting the cord 10 to the insulating cover 200 is provided on the insulating cover 200, making this connection easy and reliable.

[Effect of idea]

In the present invention described above, the noise filter element is housed by the insulating base and the insulating cover, and the ground terminal is engaged with the insulating base while straddling the insulating cover, so the volume required for the insulating cover is The plug body becomes shorter and smaller. Further, the connection between the cord and the noise filter element becomes easy and reliable.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire plug according to an embodiment of the present invention, Fig. 2 is an exploded perspective view showing the inside thereof, Fig. 3 is a perspective view showing its assembled state, and Figs. 4 a and b. Figure 5 is an exploded perspective view of a conventional plug with a built-in noise filter element, and Figure 6 is a partial perspective view of a conventional insulation base. figure. Explanation of symbols, 1... Plug body, 2... Recessed part,
3...Protrusion, 4...Cord protection part, 5...Plug terminal, 6...Plug terminal connection part, 7...Earth plate, 8...Earth pin receiver, 9...Earth plate connection terminal, 10 ... Cord, 11 ... Ground wire core, 12 ... Cord wire core, 13 ... Insulation base,
14...Guide groove, 15...Protrusion piece, 16...Insulating cover, 17...Noise filter element, 18...
...Annular ferrite core, 19...Insulated conductor, 20
... Lead end of insulated conductor, 21 ... Connection plate, 30
... Storage recess, 34 ... Guide leg, 37 ... Fixing groove, 47 ... Wire core guide groove, 100 ... Insulation base, 101 ... Base, 102 ... Support plate part, 1
03...Earth pin receiver insertion part, 104...Earth plate mounting surface part, 105...Earth plate mounting surface part,
106... Locking piece, 107... Standing piece part, 200
... Insulation cover, 201 ... Upper wall part, 202 ...
Lower wall part, 203... Rear wall part, 204... Side wall part,
205...Earth plate insertion piece part, 206...Earth plate insertion piece part, 207...Cord holding piece, 208...
... protrusion, 209 ... connection terminal, 210 ... lead-out groove, 211 ... locking arm, 212 ... slit, 3
00...Earth terminal, 301...Base, 302...
...Continuous portion, 303...Rising portion, 304...Terminal, 400...Noise filter element, 401...
Annular ferrite core, 402...Insulated conductor, 40
3,403A,404,404A...Lead end.

Claims (1)

[Claims for Utility Model Registration] A base portion for fixing a plug terminal connected to a cord core of a cord via a noise filter element, a flat element support portion on which the noise filter element is placed, and a ground pin holder. an insulating base integrally having an earth pin receiving fitting insertion part to be inserted; and a locking part that engages with the insulating base, surrounding the noise filter element placed on the flat element support part; an insulating cover having a connection terminal on the back to which the cord core of the cord and the noise filter element are connected; an insulating cover having the ground pin holder at one end and a terminal on the back to connect the ground core of the cord; It consists of a ground terminal that extends over an insulating cover and reaches the insulating base at both ends, and is integrally molded with a plastic plug body so as to enclose the insulating base, the insulating cover, and the terminal end of the cord. Features a plug.