JP2013058419A - Attachment plug and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment plug which can ensure both the electrical characteristics and the strength at an engaged part while reducing the manufacturing cost, and to provide a manufacturing method therefor.SOLUTION: An inner ring 5 consists of a first inner ring 51 in which an engaged part 51c is formed, and a second inner ring 52 having higher insulation than the first inner ring 51. First and second grounding electrode insertion holes 51b, 52c are bored in the first and second inner rings 51, 52 so that the proximal part is covered and the relative position between the first and second inner rings 51, 52 is positioned when a grounding electrode 4 is inserted. An outer cover 6 of synthetic resin softer than the inner ring 5 is placed to cover the tip of a cord 2 and the inner ring 5 by injection molding. An aperture 61 for exposing the engaged part 51c to the outer surface is formed corresponding thereto.

Description

  The present invention includes a synthetic resin core that covers a base portion of a terminal, a cord tip and an outer skin disposed so as to cover the core, and an engaging portion provided on the power supply side The present invention relates to an insertion plug provided with an engaged portion that engages with an outer surface, and a method of manufacturing the same.

  Conventionally, in order to maintain the state in which the plug (terminal) is inserted into the power outlet (terminal outlet), the power supply (outlet) side has an engaging portion, while the plug side has an engaging portion. The thing which formed the to-be-engaged engaged part (protrusion part) was proposed (refer the following patent document 1).

  In Patent Document 1 below, the engaging portion is formed on the cover that covers the terminal insertion port of the outlet, while the plug has the engaged portion on the outer surface thereof. In the process of inserting the plug terminal into the terminal insertion port, the engaging portion and the engaged portion are engaged, and the engagement of the engaging portion and the engaged portion causes the plug to be engaged. Is restricted from moving in the direction in which the terminal is pulled out, so that the inserted state of the plug is maintained.

JP 2011-124133 A

  By the way, the insertion plug as disclosed in Patent Document 1 generally includes a synthetic resin core that covers the base of the terminal and a synthetic resin outer cover that covers the core. Yes. The core is made of a material having higher insulation than the outer skin in consideration of the electrical characteristics of the plug, while the outer skin is made of a softer material than the core in consideration of operability and the like. .

  Here, as a method for manufacturing the insertion plug described above, for example, a method of manufacturing by an assembly process in which the core and the outer skin are integrated by bolt fastening or the like can be considered.

  However, in the manufacturing method including the assembly process as described above, a large gap is easily formed between the core and the outer skin, and the gap is inevitably exposed to the outer surface. Therefore, foreign matter can easily enter the inside through the gap, and as a result, the electrical characteristics of the plug may be deteriorated.

  In particular, as disclosed in the above-mentioned Patent Document 1, it is conceivable that an outlet into which a plug is inserted is installed on an outdoor wall surface when used as a charging plug for an electric vehicle or a hybrid vehicle. In addition, it is necessary to devise measures to prevent foreign matter such as rainwater and dust from entering the plug.

  Moreover, in the said patent document 1, although the said to-be-engaged part is formed in the outer skin, in this case, since the outer skin is comprised with the soft material, the intensity | strength of an to-be-engaged part cannot fully be ensured. There's a problem.

  For this reason, for example, when a large load is input to the plug, such as when a cord extending from the plug is pulled in the pulling direction, the engaged state becomes unstable due to deformation of the engaged portion, and the plug is inserted. There is a risk that it will not be possible to hold.

  An object of the present invention is to provide an insertion plug and a method of manufacturing the same that can achieve both the securing of electrical characteristics and the securing of the strength of the engaged portion while reducing the manufacturing cost.

  The present invention relates to a plurality of terminals that are connected to a distal end portion of a cord and are inserted into a terminal insertion port provided in a power outlet, a synthetic resin core that covers a base portion of the terminals, and injection molding And an outer surface made of a synthetic resin softer than the core and disposed so as to cover the tip of the cord and the core, and the engagement with the engaging portion provided on the power supply side Accordingly, the plug is provided with an engaged portion for holding the inserted state of the terminal into the terminal insertion port on the outer surface, and the core is a first in which the engaged portion is formed. A core and a second core are configured, and the first and second cores are covered with a base of the terminals by inserting at least one of the plurality of terminals. First and second terminal insertion holes are formed in which relative positions between the first and second cores are positioned. And, wherein the outer skin, wherein in response to the engaging portion, characterized in that it is a mating plug in which an opening is formed for exposing the 該被 engaging portion on the outer surface.

  As an aspect of the present invention, the first and second cores are fitted to each other by a fitting portion for positioning a relative position between the first and second cores in the insertion direction of the terminal. It can be set as the structure in which the joint part was formed.

  As an aspect of the present invention, a pair of the fitting portions are formed at both end portions of the first core, and the engaged portion and the first terminal insertion hole are formed at an intermediate portion of the pair of fitting portions. It can be configured to be formed and drilled.

  As an aspect of the present invention, the plurality of terminals include a pair of plug blades and a ground electrode, and the terminals inserted through the first and second terminal insertion holes serve as the ground electrode, and the pair of plug blades It can be set as the structure arrange | positioned in the vicinity corresponding to a pair of said fitting part.

  As an aspect of the present invention, the second core has higher insulation than the first core, and the bases of the plurality of terminals are covered with the second core, and one of the terminals One can be configured to be inserted through the first and second terminal insertion holes.

  As an aspect of the present invention, the first and second terminal insertion holes have different hole widths, and the terminal has the hole at a position corresponding to a boundary portion of the first and second terminal insertion holes. It can be set as the structure in which the level | step-difference part from which thickness differs according to a width | variety was formed.

  In addition, the present invention is connected to the tip of the cord, a plurality of terminals inserted into the terminal insertion port provided in the outlet on the power source side, a synthetic resin core covering the base of the terminal, The outer shell made of a synthetic resin that is softer than the core and engaged with the engaging portion that holds the terminal inserted into the terminal insertion port by engaging with an engaging portion provided on the power source side. A method of manufacturing an insertion plug having a portion on an outer surface, the first terminal insertion hole formed in the first core in which the engaged portion is formed, and the second core. By inserting at least one of the plurality of terminals into the second terminal insertion hole so as to cover the base portion of the terminal and positioning the relative position between the first and second cores, the core And the tip of the cord and the core are covered except for the engaged portion. Characterized in that the outer skin as a method for producing a plug plug and a step of injection molding.

  According to the present invention, the engaged portion is formed on the core (first core) that is harder than the outer skin, and the engaged portion is exposed to the outer surface from the opening of the outer skin. Thus, the strength of the engaged portion can be ensured.

  Then, the core, the outer skin, and the first and second cores can be integrated with no gap by injection molding the outer skin. For this reason, even if it is the specification which forms an opening part in an outer skin as mentioned above, foreign materials, such as earth and sand, rainwater, and dust, can be prevented reliably and the electrical property of an insertion plug can be secured. be able to.

  Furthermore, by forming the core with the first core having the engaged portion and the second core, the core can be easily formed, and the manufacturing cost of the plug is reduced. be able to.

  And by inserting the terminal into the first and second terminal insertion holes, and positioning the relative position between the first and second cores, the first and second cores can be positioned without using a dedicated jig or fastening member. The relative position between the first and second cores can be positioned using the existing components of the plug. For this reason, the manufacturing cost of the plug can be reduced.

The top view which shows the insertion plug which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a figure which shows a 1st core, Comprising: (a) Front view, (b) Bottom view, (c) BB sectional view taken on the line. It is a figure which shows a 2nd core, Comprising: (a) Back view, (b) Plan view, (c) CC sectional view taken on the line arrow (d) DD sectional view taken on the line. Sectional drawing which shows the fitting site | part of a 1st, 2nd core. The perspective view which shows a grounding electrode. It is a figure which shows the state which inserted the insertion plug in the outlet socket, Comprising: (a) Side view, (b) Front view. Explanatory drawing for demonstrating the manufacturing process of an insertion plug.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing an insertion plug according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 1 and 2, the plug 1 includes a pair of plug blades 3 and 3 and a grounding electrode 4 as a plurality of terminals connected to the distal end portion of the cord 2. And a core 5 that covers the base of the ground electrode 4 and an outer skin 6 that covers the tip of the cord 2 and the core 5.

  In the present embodiment, the above-described cord 2 includes two conductive wires 21 and 21 (only the front side is shown in FIG. 2) and one ground wire 22. The lead wire 21 and the ground wire 22 are each configured such that a core wire 21a, 22a in which a plurality of conductive wire conductors are bundled is covered with an insulating material 21b, 22b. The insulating materials 21b and 22b are removed, and the core wires 21a and 22a are exposed.

  The conductive wire 21 is connected to the plug blade 3 by connecting the exposed core wire 21a to the base of the plug blade 3 by caulking or the like, while the ground wire 22 is connected to the ground wire 22a. The tip is connected to the ground electrode 4 by being connected to the base of the electrode 4 by caulking or the like.

  Moreover, in this embodiment, the core 5 is comprised by the 1st, 2nd core 51 and 52 from which a raw material differs, respectively. The first core 51 is made of a material harder than the second core 52, while the second core 52 is made of a material having higher insulation than the first core 51, for example, The first core 51 is made of polybutylene terephthalate (PBT) resin, and the second core 52 is made of melamine resin.

  As shown in FIG. 3, the first core 51 has a pair of fitting portions 51 a and 51 a that are convex at both ends. A first grounding electrode insertion hole 51b corresponding to the shape of the grounding electrode 4 is formed in an intermediate part between the pair of fitting parts 51a and 51a, and an engaged part having a fitting recess 51d. 51c is formed.

  On the other hand, as shown in FIG. 4, the second core 52 is provided with a pair of fitting holes 52 a and 52 a that can be fitted to the fitting portion 51 a of the first core 51. A pair of plug blade insertion holes 52b and 52b corresponding to the shape of the plug blades 3 and 3 are formed in the vicinity of the pair of fitting holes 52a and 52a. A second grounding electrode insertion hole 52c corresponding to the shape of the grounding electrode 4 is formed in an intermediate portion between the fitting holes 52a and 52a.

  In the core 5, the base portions of the plug blades 3, 3 are covered with the second core 52 by inserting the plug blades 3, 3 into the plug blade insertion holes 52 b, 52 b of the second core 52. And the plug blades 3 and 3 are arrange | positioned in the vicinity corresponding to a pair of fitting part 51a, 51a (fitting hole 52a, 52a), as shown in FIG.

  Further, in the core 5, the relative position between the first and second cores 51 and 52 in the insertion direction of the ground electrode 4 is positioned by fitting the fitting portion 51 a and the fitting hole 52 a. ing. As a result of this positioning, the first and second grounding electrode insertion holes 51b and 52c communicate with each other as shown in FIG. 2 to form one continuous grounding electrode insertion hole 53.

  In the present embodiment, the ground electrode 4 is inserted into the ground electrode insertion hole 53 so that the base of the ground electrode 4 is covered with the first and second cores 51 and 52. As shown in FIG. 5, the ground electrode 4 is disposed at an intermediate portion between the pair of fitting portions 51 a and 51 a (fitting holes 52 a and 52 a), and also in a direction orthogonal to the insertion direction (hereinafter, The relative position between the first and second cores 51 and 52 in the orthogonal direction) is positioned by the ground electrode 4.

  Here, the first core 51 covers only the base of the ground electrode 4, while the second core 52 covers the plug blades 3 and 3 and the base of the ground electrode 4. In the present embodiment, the second blade 52 that covers the bases of the plurality of terminals (the plug blades 3 and 3 and the ground electrode 4) in this way is made of a material having high insulating properties, so that the plug blade 3 3, the grounding electrodes 4 are reliably insulated from each other, and the electrical characteristics of the plug 1 are improved.

  Further, in the core 5, the cross-sectional shape of the first grounding electrode insertion hole 51 b is a polygonal shape (a regular hexagonal shape here) as shown in FIG. 3, while the cross-sectional shape of the second grounding electrode insertion hole 52 c is 4 has a circular shape as shown in FIG. Accordingly, the first and second grounding electrode insertion holes 51b and 52c have different hole widths (cross-sectional areas), and the first grounding electrode insertion hole 51b is set to be larger than the second grounding electrode insertion hole 52c. ing.

  On the other hand, in the grounding electrode 4, as shown in FIGS. 2, 5, and 6, the cross-sectional shape of the base covered with the first core 51 is a polygonal shape corresponding to the shape of the first grounding electrode insertion hole 51b. The cross-sectional shape of the base covered with the second core 52 is circular corresponding to the shape of the second grounding electrode insertion hole 52c.

  In the ground electrode 4, a polygonal portion is formed thicker than the others, and a stepped portion 41 is formed by the thick portion and the other portions. As a result, when the ground electrode 4 is inserted into the ground electrode insertion hole 53, the boundary between the first and second ground electrode insertion holes 51b and 52c and the stepped portion 41 are fitted with no gap therebetween. 4 is positioned. By positioning the ground electrode 4, the tip of the ground electrode 4 is disposed at a position protruding from the tip of the plug blades 3 and 3 as shown in FIGS. 1 and 2.

  By the way, the outer skin 6 is made of a material softer than the first and second cores 51 and 52, and is made of, for example, a polyvinyl chloride resin. And it arrange | positions so that the front-end | tip part of the code | cord | chord 2 and the core 5 may be coat | covered by injection molding mentioned later, as shown in FIG.

  Further, in the outer skin 6, an opening 61 is formed in the outer skin 6 at a position corresponding to the engaged portion 51 c of the first core 51. As shown in FIGS. 1 and 2, the engaged portion 51 c is exposed from the opening 61 to the outer surface of the insertion plug 1.

Next, a method of connecting the plug 1 to the power outlet 7 will be described with reference to FIG.
The outlet 7 shown in FIG. 7 is similar to the outlet disclosed in Patent Document 1, with a main body 71 having a pair of plug blade insertion ports 71a and 71a and a grounding electrode insertion port 71b, a hinge (not shown), and the like. And a cover 72 that is rotatably supported by the main body 71.

  In the outlet 7, the cover 72 is attached in a direction to close the plug blade insertion ports 71a and 71a and the grounding electrode insertion port 71b by an urging means such as a spring as shown by a two-dot chain line in FIG. It is energized. A wedge-shaped engagement portion 72a is formed on the inner surface side of the cover 72, that is, on the surface side facing the plug blade insertion ports 71a and 71a and the ground electrode insertion port 71b when the cover 72 is closed. ing.

  When inserting the plug 1 into the outlet 7, the user first opens the cover 72 by rotating the cover 72 against the urging force of the urging means. Then, with the cover 72 kept open, the side where the engaged portion 51c of the insertion plug 1 is exposed faces the inner surface side of the cover 72, and the plug blades 3, 3 and the grounding electrode 4 correspond to each other. To be inserted into the insertion ports 71a, 71a, 71b.

  At this time, when the tip of the engaged portion 51c gets over the engaging portion 72a in the process of inserting the plug blade 3 or the like into the plug blade insertion port 71a or the like, the engaging portion 72a is as shown in FIG. In addition, the engagement portion 72 and the engaged portion are engaged with each other by being fitted into the fitting recess 51d of the engaged portion 51c by the urging force of the urging means. The engagement between the engaging portion 72 and the engaged portion 51c restricts the insertion plug 1 from moving in the pulling direction of the plug blade 3 and the like, and the insertion plug 1 (plug blade 3 and the like) is inserted. Is to be retained.

  Next, a method for manufacturing the insertion plug 1 will be described with reference to FIG. In manufacturing the plug 1, first, as shown in FIG. 8A, the fitting portion 51 a of the first core 51 is fitted into the fitting hole 52 a of the second core 52, and the ground electrode 4 is inserted. The relative position between the first and second cores 51 and 52 in the direction is positioned. At this time, the first and second grounding electrode insertion holes 51b and 52c communicate with each other to form one continuous grounding electrode insertion hole 53 as shown in FIG. 8B.

  And as shown in FIG.8 (b), the plug blades 3 and 3 to which the front-end | tip of the conducting wire 21 was connected previously are each inserted in the plug blade insertion holes 52b and 52b of the 2nd core 52 corresponding, At the same time that the base is covered with the second core 52, the ground electrode 4 to which the tip of the ground wire 22 is connected in advance is inserted into the corresponding ground electrode insertion 53, and the base is connected to the first, second core 51, 52.

  At this time, the relative position between the first and second cores 51 and 52 in the orthogonal direction is positioned by inserting the ground electrode 4. Thereby, in the 1st and 2nd core 51 and 52, the relative position in the said insertion direction and the said orthogonal direction is positioned, and the relative position between both the cores 51 and 52 is fixed substantially completely. As a result, the core 5 is generated.

  Next, except for the engaged portion 51 c of the first core 51, the outer skin 6 is covered so as to cover the tip end portion of the cord 2 (the conductive wire 21 and the ground wire 22) and the first and second cores 51 and 52. Injection molding. In order to form the outer skin 6, the core 5 generated in the core generation process shown in FIGS. 8A and 8B has a cavity with a predetermined shape as shown in FIG. It puts between the mold 8 and the lower mold 9 and is injection-molded with a synthetic resin (specifically, a polyvinyl chloride resin). By this injection molding process, the outer skin 6 having the opening 61 for exposing the engaged portion 51c to the outer surface is formed, and the insertion plug 1 is completed.

  As described above, in the plug 1 according to the present embodiment, the engaged portion 51 c is formed on the core 5 (first core 51) that is harder than the outer skin 6, and the engaged portion 51 c is connected to the outer skin 6. Since the opening 61 is exposed to the outer surface, the strength of the engaged portion 51c can be ensured.

  Then, the core 5 and the outer skin 6 and the first and second cores 51 and 52 can be integrated with no gap by injection molding the outer skin 6. For this reason, even if it is the specification which forms the opening part 61 in the outer skin 6 as mentioned above, foreign materials, such as earth and sand, rainwater, and dust, can be prevented reliably and the electrical characteristics of the plug 1 Can be secured.

  Further, since the core 5 has the plug blade 3, the insertion holes 51b, 52b, 52c of the grounding electrode 4, and the engaged portion 51c, the shape is inevitably complicated. The integral molding of 5 is extremely difficult.

  Therefore, in the present embodiment, the first core 51 in which the engaged portion 51c is formed and the second core 52 constitute the core 5. Thereby, shaping | molding of the core 5 can be made easy and the manufacturing cost reduction of the insertion plug 1 can be aimed at.

  In this embodiment, the relative position between the first and second cores 51 and 52 is determined by inserting the ground electrode 4 into the first and second ground electrode insertion holes 51b and 52c. ing. Accordingly, the relative position between the first and second cores 51 and 52 can be positioned using the existing components of the plug 1 without using a dedicated jig or fastening member. For this reason, the manufacturing cost of the plug 1 can be reduced.

  In addition, by forming the fitting portion 51a and the fitting hole 52a in the first and second cores 51 and 52, the first and second cores 51 and 52, The relative positions in the insertion direction and the orthogonal direction can be positioned, and the relative positions between the first and second cores 51 and 52 can be fixed almost completely.

  In this case, the first and second cores 51 and 52 can be reliably prevented from shifting in the subsequent injection molding process of the outer skin 6, and the core 5 (first and second cores 51 and 52) and the outer skin 6 can be prevented. Can be integrated more accurately. For this reason, the probability that a defective product of the plug 1 is generated can be reduced, and as a result, the manufacturing cost of the plug 1 can be further reduced.

  Further, by forming the pair of fitting portions 51a and 51a, it is possible to improve the positioning accuracy of the first and second cores 51 and 52, and to shift the first and second cores 51 and 52. It can suppress more reliably.

  Since the engaged portion 51c is formed in the middle portion of the pair of fitting portions 51a and 51a, for example, the cord 2 is pulled in the pull-out direction of the plug 1 so that the engaged portion 51c is large. When a load is applied, it is possible to prevent the load input through the engaged portion 51c from being biased to one of the fitting portions 51a and 51a (fitting holes 52a and 52a). Thereby, damage to core 5 (specifically fitting part 51a and fitting hole 52a) can be controlled.

  Further, the first grounding electrode insertion hole 51b is formed in the middle part of the pair of fitting parts 51a and 51a, so that, for example, when the insertion plug 1 inserted into the outlet 7 (see FIG. 7) is pulled out, When a large load is applied to the ground electrode 4 by, for example, pulling the plug 1 so as to swing it up and down (or front and rear) left and right, the load input through the ground electrode 4 is applied to one of the fitting portions 51a and 51a. Can be avoided. Thereby, damage to the core 5 can be suppressed.

  Further, by inserting the pair of plug blades 3 and 3 in the vicinity thereof corresponding to the pair of fitting portions 51a and 51a (fitting holes 52a and 52a), for example, an insertion plug inserted into the outlet 7 When a large load is applied to the plug blades 3, 3 and the grounding electrode 4 by pulling the insertion plug 1 up and down (or front / back) left and right when pulling out the plug 1, the plug blades 3, 3 and the grounding electrode 4 can prevent the load input via 4 from being biased to one of the fitting portions 51a and 51a. Thereby, damage to the core 5 can be suppressed.

  Further, the bases of the plurality of terminals (plug blades 3, 3, grounding electrode 4) are covered with a second core 52 having high insulation, and one terminal (grounding electrode 4) is connected to the first and second terminals. As described above, the electrical property of the insertion plug 1 is improved by the second core 52 while being inserted into the grounding electrode insertion holes 51b and 52c. The manufacturing cost of the plug 1 can be reduced by minimizing the use of high materials.

  In addition, the first and second grounding electrode insertion holes 51b and 52c are formed so as to have different hole widths, while the grounding electrode 4 corresponds to the boundary between the first and second grounding electrode insertion holes 51b and 52c. Since the step portion 41 is formed at the position where the first and second cores 51 and 52 are not formed, the width of the first and second grounding electrode insertion holes 51b and 52c is not required. Due to this difference, a stepped portion can be formed at the boundary portion, and by positioning the stepped portion and the stepped portion 41, the ground electrode 4 can be positioned reliably. For this reason, the core 5 can be easily molded, and as a result, the manufacturing cost of the insertion plug 1 can be further reduced.

  Then, by improving the positioning accuracy of the ground electrode 4, as described above, it is possible to reliably position the tip of the ground electrode 4 to protrude from the tip of the plug blade 3.

  In the above-described embodiment, the relative position between the first and second cores 51 and 52 is determined by the ground electrode 4 among the terminals of the plug 1. However, the present invention is not limited to this, and the positioning may be performed by the plug blade 3 that is one of the terminals. In this case, the present invention can be applied even to an insertion plug that does not include the ground electrode 4.

  In the present invention, the number of terminals for positioning the relative position between the first and second cores 51 and 52 may be at least one. Furthermore, the second core 52 is more It is not limited to comprising the material which has high insulation. Therefore, a plurality of insertion holes may be formed in the first and second cores 51 and 52, and the positioning may be performed by a plurality of terminals.

In correspondence between the configuration of the present invention and the above-described embodiment,
The plurality of terminals of the present invention correspond to the plug blades 3 and 3 and the ground electrode 4
Similarly,
The first and second terminal insertion holes correspond to the first and second grounding electrode insertion holes 51b and 52c,
The fitted portion corresponds to the fitting hole 52a,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Plug 2 ... Cord 3 ... Plug blade 4 ... Grounding pole 5 ... Core 6 ... Outer skin 7 ... Outlet 41 ... Step part 51 ... 1st core 51a ... Fitting part 51b ... 1st earthing pole insertion hole 51c ... Engagement portion 52 ... second core 52a ... fitting hole 52c ... second grounding electrode insertion hole 61 ... opening 72a ... engagement portion

Claims (7)

A plurality of terminals connected to the tip of the cord and inserted into the terminal insertion port provided in the power outlet;
A synthetic resin core covering the base of the terminal;
The injection molding is provided with a sheath made of a synthetic resin that is softer than the core disposed so as to cover the tip portion of the cord and the core,
An insertion plug provided on an outer surface with an engaged portion that holds an insertion state of the terminal into the terminal insertion port by engagement with an engagement portion provided on the power supply side,
The core includes a first core in which the engaged portion is formed;
Composed of a second core,
By inserting at least one of the plurality of terminals into the first and second cores, the base of the terminals is covered, and the relative position between the first and second cores is positioned. The first and second terminal insertion holes are formed,
An insertion plug in which an opening for exposing the engaged portion to the outer surface is formed in the outer skin corresponding to the engaged portion. The first and second cores are formed with fitting portions and fitted portions for positioning relative positions between the first and second cores in the insertion direction of the terminals by mutual fitting. The plug according to claim 1. A pair of the fitting portions are formed at both end portions of the first core,
The insertion plug according to claim 2, wherein the engaged portion and the first terminal insertion hole are formed and drilled in an intermediate portion of the pair of fitting portions. As the plurality of terminals, a pair of blades and a grounding electrode are provided,
The terminal inserted through the first and second terminal insertion holes is the ground electrode,
The insertion plug according to claim 3, wherein the pair of plug blades are disposed in the vicinity thereof corresponding to the pair of fitting portions. The second core has higher insulation than the first core,
The bases of the plurality of terminals are covered with the second core,
The insertion plug according to any one of claims 1 to 4, wherein one of the terminals is inserted into the first and second terminal insertion holes. The first and second terminal insertion holes have different hole widths,
The said terminal was formed in the position corresponding to the boundary part of the said 1st, 2nd terminal penetration hole, and the level | step-difference part from which thickness differs corresponding to the said hole width was formed. Insert plug as described in. A plurality of terminals connected to the tip of the cord and inserted into the terminal insertion port provided in the power outlet;
A synthetic resin core covering the base of the terminal;
And a skin made of a synthetic resin softer than the core,
A method of manufacturing an insertion plug provided on an outer surface with an engaged portion that holds an insertion state of the terminal into the terminal insertion port by engagement with an engagement portion provided on the power supply side,
At least one of the plurality of terminals is inserted into a first terminal insertion hole formed in the first core in which the engaged portion is formed and a second terminal insertion hole formed in the second core. A step of covering the base portion of the terminal by inserting and positioning the relative position between the first and second cores to generate the core;
And a step of injection molding the outer skin so as to cover the tip end portion of the cord and the core excluding the engaged portion.

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