JP6086843B2 - Plug - Google Patents

Description

  The present invention relates to an insertion plug in which, for example, a covered electric wire in which a conductor is covered with an insulating coating and two plug blades connected to the covered electric wire are covered with an insulating resin skin member.

  Conventionally, an electrical plug connected to the other end of the wire cord can be connected to a plug receptacle such as an outlet installed on the wall by connecting the plug with one end of the wire cord bundled with the covered wire. Power.

  Such plugs are used in various countries around the world, but have different specifications for each country or region, such as the shape and arrangement of the plug blades and the presence or absence of a ground terminal. For example, an insertion plug in Japan covers two substantially flat-shaped plug blades having an electric wire cord connected to one end, and a plug blade and an electric wire cord juxtaposed with the flat portions facing each other in the thickness direction of the plug blade. It is comprised with the outer skin member, The plug blade exposed from the outer skin member is formed so that a connection to a plug receptacle is possible.

  By the way, the plug is rarely handled roughly when it is pulled out from the plug receptacle. For example, the electric wire cord may be pulled out from the plug receptacle, or may be pulled out from the plug receptacle while greatly shaking the plug. In addition, a heavy electrical device connected to the plug receptacle via an insertion plug, for example, an electric tool, may be accidentally dropped, or a foot plug etc. May be forcibly pulled out unintentionally.

If it is pulled out of the plug receptacle in this way, an unintended input load may be applied to the plug blade or the wire cord, for example, excessive bending stress is applied to the plug blade or excessive tension is applied to the wire cord. It was. For this reason, the insertion plug may have problems such as disconnection of the conductor and poor contact between the conductor and the plug blade due to an unintended input load.
In view of this, various plugs have been proposed for preventing problems caused by unintended input loads.

  For example, the insertion plug described in Patent Document 1 covers two plug blades having a connection portion to which a conductor of an insulation core wire (corresponding to a covered wire) of an electric wire cord is connected, and the insulation core wire and the connection portion. A hard resin internal molded body having a covering fixing portion to be fixed and a bridge for connecting the covering fixing portions to each other so as to be bendable, and a hard resin internal molded body in which an insulating core wire is wound around the bridge are covered and fixed. It consists of a soft resin external molded body.

  Thereby, the insertion plug of patent document 1 can receive the tension | tensile_strength applied to the electric wire cord with a bridge | bridging, and can reduce the load which acts on a connection part. For this reason, it is supposed that the plug described in Patent Document 1 can ensure electrical conductivity by preventing breakage of the connecting portion and disconnection of the conductor even if excessive tension is applied to the electric wire cord.

  However, the insertion plug described in Patent Document 1 requires the bridge to be strong enough to withstand the tension applied to the electric wire cord, so that the thickness of the bridge needs to be increased. That is, it can be said that the bridge in the insertion plug described in Patent Document 1 is bendable but has low flexibility. For this reason, when the electric wire cord is wound around the bridge, the insertion plug described in Patent Document 1 has a possibility that the bridge may be damaged if the interval between the covering fixing portions is widened.

JP 2003-178835 A

  In view of the above-described problems, an object of the present invention is to provide an insertion plug that can secure stable conductivity even when an unintended input load is applied and can improve assembly workability.

  According to the present invention, one end of a conductor connecting portion that allows connection between two covered electric wires in which a conductive conductor is covered with an insulating insulating coating and a predetermined length exposed in the longitudinal direction of the covered electric wire. Two flat blades having a flat plate, a holding portion for holding at least the conductor connecting portions in the plug blades arranged in parallel with the flat portions facing each other in the thickness direction of the plug blades, and the thickness direction An insertion plug comprising a plug blade holding member integrally forming a connecting portion for connecting the holding portion, and an outer skin member made of a soft resin covering at least the plug blade holding member, the thickness direction at the connecting portion A thin-walled portion having a thin thickness in the longitudinal direction is provided at substantially the center.

The plug blade holding member is made of an insulating synthetic resin and can be formed of, for example, polypropylene.
The outer cover member made of the soft resin is preferably made of a soft resin rather than the stopper blade holding member, and has an insulating property, and can be made of, for example, polyvinyl chloride.

According to the present invention, it is possible to ensure stable conductivity even when an unintended input load is applied, and to improve the assembly workability.
Specifically, by providing the thin portion, the connecting portion can have higher flexibility than a bendable connecting portion having a constant thickness in the longitudinal direction, for example.

  Thereby, the insertion plug can raise the freedom degree of a deformation | transformation with respect to an input load with the high flexibility of a connection part, and can widen the space | interval of the plug blade which faces. For this reason, the plug can prevent the plug blade holding member from being easily damaged by an unintended input load, and can improve workability in the assembling work.

  For example, when a covered electric wire is wound around the connecting portion, the thin portion is bent, so that the plug blade holding member can prevent the connecting portion from being damaged even if the interval between the plug blades is widened. For this reason, the plug blade holding member can wind the covered electric wire around the connecting portion while widening the gap between the plug blades.

Alternatively, when a plug blade connected by a plug blade holding member is incorporated into a mold or the like for forming an outer skin member, the plug blade holding member absorbs a dimensional error from the mold by bending a thin portion of the connecting portion. be able to.
Thereby, the insertion plug can improve the assembly workability because the flexibility of the thin-walled portion increases the degree of freedom of deformation of the plug blade holding member.

  Further, an unintended input load applied to the two plug blades or the two covered electric wires acts on the holding portion of the plug blade holding member via the plug blades or the covered electric wires. At this time, the stopper blade holding member can absorb the bending or twisting of the connecting portion caused by variation in the input load acting on the holding portion by the flexibility of the thin portion.

  In addition, in the case of a connecting portion having low flexibility, the degree of freedom of deformation in the plug blade holding member is low, so that the outer skin member is plugged against an unintended input load transmitted through the plug blade holding member. The blade holding member prevents the deformation. For this reason, it is difficult for an unintended input load to be transmitted and dispersed to the outer skin member, and there is a possibility that problems such as disconnection of the conductor may occur.

  On the other hand, since the flexibility of the thin-walled portion increases the degree of freedom of deformation in the blade holding member, the outer skin member is inhibited from being deformed by the blade holding member against an unintended input load. It can deform | transform more easily, without. For this reason, the insertion plug can reliably transmit and distribute the input load acting on the plug blade holding member to the outer skin member via the plug blade holding member.

Thereby, the plug can prevent the breakage of the blade holding member and the deformation of the blade due to an unintended input load applied to the blade or the covered electric wire. That is, the plug can prevent the bending stress and tension from acting on the conductor connecting portion of the plug blade and the conductor of the covered electric wire, thereby preventing problems such as disconnection of the conductor.
Therefore, the insertion plug is provided with a thin portion at the connecting portion, so that it is possible to ensure stable conductivity even when an unintended input load is applied and to improve the assembling workability.

  As an aspect of the present invention, the connecting portion is formed on the covered electric wire side in the holding portion, and the thin portion is directed from the plug blade side of the connecting portion toward the covered electric wire side along the longitudinal direction. It can be formed by a slit recessed in a slit shape.

According to this invention, it is possible to facilitate the formation of the thin-walled portion and to improve the assembling workability.
Specifically, for example, when a substantially strip-shaped thin portion is formed at the approximate center in the longitudinal direction of the connecting portion, the connecting portion can be easily bent to the same extent in the direction of narrowing and widening the gap between the facing blades. . For this reason, when the blade connected by the blade holding member is assembled in the mold, or when the covered electric wire is wound around the connecting portion, the distance between the blade blades facing each other is not stable, which causes a reduction in assembly workability. Become.

  On the other hand, the stopper blade holding member easily configures a thin portion by a slit formed on the stopper blade side of the connecting portion, and restricts the bending of the connecting portion in the direction of narrowing the interval between the stopper blades facing each other. Can do.

More specifically, since the gaps between the slits are clogged when the facing plug blades are brought close to each other, the plug blade holding member can regulate the bending of the connecting portion in the direction of narrowing the distance between the facing plug blades.
On the other hand, if the gap between the facing blades is widened, the gap between the slits is widened. Therefore, the blade holding member does not restrict the bending of the connecting portion in the direction of widening the gap between the facing blades.

  Thereby, the stopper blade holding member can facilitate the formation of the thin portion by the slit and the restriction of the bending at the connecting portion. For this reason, for example, when the covered electric wire is wound around the connecting portion, the plug blade holding member can bend the connecting portion only in the direction in which the interval between the plug blades is increased, and the covered electric wire can be wound more easily. Alternatively, for example, when the plug blade holding member is incorporated into a mold for forming the outer skin member, the plug blade can be easily incorporated with the blades being substantially parallel.

Furthermore, for example, when the covered electric wire is wound around the connecting portion, even if the conductor of the covered electric wire is exposed, the insertion plug is restricted from bending in the direction of narrowing the gap between the facing plug blades, It can prevent that conductors contact.
Therefore, the insertion plug can easily configure the thin portion by the slit formed on the plug blade side of the connecting portion, and can improve the assembling workability.

  Further, as an aspect of the present invention, in the connecting portion, a portion interposed between the holding portion and the thin portion is a first base portion and a second base portion, and the two covered electric wires exposed from the holding portion Are wound around the first base portion and the second base portion, respectively, and the sheath member is configured to cover at least the covered electric wire wound around the plug blade holding member.

  According to the present invention, the tension applied to the covered electric wire can be received by the connecting portion. At this time, the insertion plug can absorb the tension acting on the connecting portion by bending the thin portion of the connecting portion. For this reason, the insertion plug can more reliably prevent the tension from acting directly on the connection portion between the conductor connection portion of the plug blade and the conductor of the covered electric wire.

Thereby, even if an excessive tension is applied to the covered electric wire, the plug can stably ensure a good connection state between the plug blade and the covered electric wire.
Therefore, the insertion plug can secure more stable conductivity even when an unintended input load is applied by winding the covered electric wire around the connecting portion.

  Further, as an aspect of the present invention, a semicircular recess that is substantially semicircular in shape in the longitudinal direction and is substantially the same as the outer diameter of the covered electric wire on the plug blade side of the first base and the second base. Can be provided.

According to the present invention, the covered electric wire can be wound using the semicircular recess as a guide. At this time, since the covered electric wire is fitted into the semicircular recess, the insertion plug can restrict movement of the wound covered electric wire between the holding portions. For this reason, the insertion plug can more reliably prevent the conductors from contacting each other even if the conductors of the covered electric wires are exposed.
Therefore, the insertion plug can restrict the movement of the covered electric wire by the semicircular recess, and can secure stable conductivity and improve the assembly workability even when an unintended input load is applied.

As an aspect of the present invention, the holding portion can be provided with a convex portion protruding from the peripheral surface or / and a concave portion recessed on the peripheral surface.
The convex portion may have a shape in which a part of the holding portion is widened or a protrusion shape.
The concave portion may have a hole shape having a predetermined size or a groove shape.

  According to the present invention, the contact area between the outer skin member and the holding portion can be further increased. Furthermore, since the outer skin member and the blade holding member are locked by the convex portion or / and the concave portion, the insertion plug can further strengthen the contact state between the outer skin member and the blade holding member.

Thereby, the insertion plug can more reliably transmit and distribute the bending stress and tension transmitted to the holding portion to the outer skin member when bending stress and tension are applied.
Therefore, the insertion plug can ensure stable conductivity even when an unintended input load is applied due to the convex portion or / and the concave portion.

  According to the present invention, it is possible to provide an insertion plug that can ensure stable conductivity even when an unintended input load is applied and can improve assembly workability.

The external appearance perspective view which shows the external appearance in an insertion plug. The fragmentary sectional view which shows the cross section of the insertion plug crossed along the longitudinal direction. The side view which shows the winding state of the electric wire cord with a plug blade in a side view. The external appearance perspective view which shows the external appearance of the electric wire cord with a plug blade in the unwinding state. The fragmentary sectional view which shows the cross section of the electric wire cord with a plug blade which traversed along the longitudinal direction. Explanatory drawing explaining the process of forming the blade holding | maintenance member. Explanatory drawing explaining the process of winding a covering electric wire around a stopper blade holding member. Explanatory drawing explaining the process of forming an outer skin member.

An embodiment of the present invention will be described below with reference to the drawings.
First, the plug 1 according to the present embodiment will be described in detail with reference to FIGS.
1 shows an external perspective view of the plug 1, FIG. 2 shows a partial cross-sectional view of the plug 1 crossed along the longitudinal direction X, and FIG. 3 shows a winding state of the wire cord 10 with plug blades. 4 is a perspective view of the outer appearance of the wire cord 10 with plug blades in the unrolled state, and FIG. 5 is a partial sectional view of the wire cord 10 with plug blades traversed along the longitudinal direction X. Yes.

In FIG. 1, an arrow X indicates the longitudinal direction (hereinafter referred to as “longitudinal direction X”), and an arrow Y indicates the width direction (hereinafter referred to as “width direction Y”). Furthermore, in the longitudinal direction X, the plug blade 40 side (left side in FIG. 1) described later is defined as the front, and the covered electric wire 31 side (right side in FIG. 1) described later with respect to the plug blade 40 is defined as the rear. In addition, the upper side in FIG. 1 is the upper side, and the lower side in FIG. 1 is the lower side.
Moreover, in FIG. 3, the outer skin member 20 is shown with the dashed-two dotted line.

  As shown in FIGS. 1 and 2, the plug 1 includes a plug blade-attached electric wire cord 10 having one end connected to an appropriate electric device (not shown) such as an electric tool and a plug blade-attached electric wire cord 10. The outer cover member 20 is covered.

  As shown in FIG. 2 to FIG. 5, the wire cord 10 with a plug blade includes a wire cord 30 in which two covered wires 31 are bundled, two plug blades 40 respectively connected to the tips of the covered wires 31, It comprises a blade holding member 50 for holding two blades 40. In the state covered with the outer skin member 20, the plug-cable-attached electric wire cord 10 wraps the covered electric wire 31 around the electric wire receiving portions 54 a and 55 a of the plug blade holding member 50 described later.

  As shown in FIG. 2, the covered wire 31 is formed by covering a conductive conductor 33 with an insulating synthetic resin insulating coating 32. The conductor 33 is configured by bundling or twisting a plurality of strands (not shown) such that the cross section has a predetermined cross sectional area. The electric wire cord 30 is configured by bundling two covered electric wires 31 having such a configuration and covering them with an insulating covering tube 34.

  As shown in FIGS. 4 and 5, the plug blade 40 includes a blade portion 41 inserted into a plug receiver (not shown), and a conductor crimping portion 42 crimped and connected to the conductor 33 exposed from the insulating coating 32. They are integrally formed in this order from the front in the longitudinal direction X.

The blade portion 41 is formed in a substantially rectangular flat plate shape having a predetermined thickness in the width direction Y.
The conductor crimping portion 42 is formed in a so-called open barrel type in which a thin plate that is thinner than the plate pressure of the blade portion 41 is curved so that the cross section in the width direction Y has a substantially U-shaped cross section.
The plug blade 40 crimps and connects the conductor 33 exposed to a predetermined length from the insulating coating 32 and the conductor crimping portion 42, and the plane portion (not shown) of the blade portion 41 is in the width direction Y. It is arranged to face each other.

As shown in FIGS. 4 and 5, the blade holding member 50 is made of polypropylene having insulation properties, and includes a first holding portion 51 and a second holding portion 52 that hold the covered electric wire 31 and the blade 40, The first holding part 51 and the connecting part 53 that connects the vicinity of the rear ends of the second holding part 52 in the width direction Y are integrally formed to have a substantially portal shape in plan view.
The first holding part 51 and the second holding part 52 have a substantially quadrangular prism shape that is long in the longitudinal direction X, and range from the vicinity of the rear end of the blade part 41 in the plug blade 40 to the vicinity of the front end of the insulating coating 32 in the covered electric wire 31. It is formed to surround.

  Furthermore, outer peripheral protrusions 51a and 52a are formed on the front portions of the first holding part 51 and the second holding part 52 so as to protrude outward in a predetermined range in the longitudinal direction X. doing. The outer peripheral projections 51a and 52a are formed in a range excluding the surface facing the other holding portion. In addition, circular recesses 51b and 52b each having a substantially circular shape in plan view are formed on the upper surface and the lower surface of the rear portion of the first holding unit 51 and the second holding unit 52, respectively. doing.

The connecting portion 53 includes a first base portion 54 extending from the first holding portion 51, a second base portion 55 extending from the second holding portion 52, and a thin portion 56 connecting the first base portion 54 and the second base portion 55. And are integrally formed.
More specifically, the connecting portion 53 has a length in the vertical direction shorter than the length in the vertical direction in the first holding portion 51 and the second holding portion 52 and has a width substantially in the center in a plan view of a substantially quadrangular prism shape extending in the width direction Y. A first base portion 54, a thin portion 56, and a second base portion 55 are formed by slits 57 having a constant interval in the direction Y and opening in a slit shape from the front to the rear.

  On the front surfaces of the first base portion 54 and the second base portion 55, wire receiving portions 54a and 55a that are recessed substantially in a semicircular shape toward the rear are formed in a plan view. The wire receiving portions 54 a and 55 a are formed with a diameter substantially equal to the outer diameter of the insulating coating 32 in the covered electric wire 31.

  The outer skin member 20 is made of polyvinyl chloride which is softer and more insulative than the blade holding member 50 and covers a predetermined length range from the blade portion 41 exposed from the blade holding member 50 to the rear. ing. More specifically, the outer skin member 20 includes an outer skin main body portion 21 that covers a range in the longitudinal direction X from the blade portion 41 exposed from the plug blade holding member 50 to the front end of the covering tube 34, and a rear end of the outer skin main body portion 21. A bellows portion 22 formed in a bellows shape is integrally formed.

Next, a method for manufacturing the above-described plug 1 will be described in detail with reference to FIGS.
6 is an explanatory view for explaining the process of forming the blade holding member 50, FIG. 7 is an explanatory view for explaining the step of winding the covered wire 31 around the blade holding member 50, and FIG. The explanatory view explaining the process of forming member 20 is shown.

  First, the conductor 33 is exposed by removing a predetermined length from the tip of the insulating coating 32 in the covered electric wire 31. Then, after placing the exposed conductor 33 on the conductor crimping portion 42 of the plug blade 40, the conductor 33 and the conductor crimping portion 42 are crimped and connected by crimping the conductor crimping portion 42 using a predetermined crimping tool. To do. At this time, the plug blade 40 is crimped and connected with the relative position of the plug blade 40 with respect to the covered electric wire 31 so that the flat portion of the blade portion 41 in the plug blade 40 can easily face the width direction Y.

  When the electric wire cord 30 and the plug blade 40 are crimped and connected, the plug blade holding member 50 that covers the conductor crimping portion 42 and the covered electric wire 31 is formed by injection molding. Specifically, as shown in FIG. 6, the plug blade 40 and the electric wire cord 30 are sandwiched between the first mold 2 that is divided into upper and lower parts. The first mold 2 has an inner surface shape capable of sandwiching the blade portion 41 of the plug blade 40 and a portion near the rear from the front end of the insulating coating 32, and an inner surface substantially the same as the outer surface shape of the plug blade holding member 50. It has an internal space S1 formed in a shape.

  The plug blade holding member 50 is formed by injecting molten polypropylene into the internal space S1 of the first mold 2 with respect to the plug blade 40 and the electric wire cord 30 sandwiched between the first mold 2. The attached electric wire cord 10 is configured.

  If the electric wire cord 10 with a plug blade is configured, the covered electric wire 31 is wound around the first base portion 54 and the second base portion 55 of the plug blade holding member 50. Specifically, as shown in FIG. 7A, the front end of the first base portion 54 and the second base portion 55 are bent so that the connecting portion 53 of the blade holding member 50 protrudes forward in plan view. The width direction Y interval between the front ends of the blade 40 is widened while increasing the width direction Y interval between the front ends of the slit blades 57, that is, the width direction Y interval at the front end of the slit 57.

  And in the state where the interval in the width direction Y in the plug blade 40 is widened, as shown in FIG. 7B, the covered electric wire 31 is passed between the first holding part 51 and the second holding part 52, The plug blade holding member 50 is rotated once from the upper side to the rear together with the plug blade 40. When the blade holding member 50 is rotated once, as shown in FIG. 7C, the covered wire 31 is wound around the wire receiving portions 54 a and 55 a of the connecting portion 53.

  When the covered electric wire 31 is wound around the plug blade holding member 50, the outer skin member 20 that covers the plug blade holding member 50 and the electric wire cord 30 is formed by injection molding. In detail, as shown in FIG. 8, the electric wire cord 10 with a blade is sandwiched between the second mold 3 divided into two parts. The second mold 3 has an inner surface shape capable of sandwiching the blade portion 41 of the plug blade 40 and the electric wire cord 30, and has an inner space S2 formed with an inner surface shape substantially the same as the outer surface shape of the outer skin member 20. doing.

  By inserting molten polyvinyl chloride into the inner space S2 of the second mold 3 to form the outer skin member 20 with respect to the wire cord 10 with a blade held by the second mold 3, an insertion plug 1 is constructed.

The plug 1 that realizes the above configuration can ensure stable conductivity and improve the assembly workability even when an unintended input load is applied.
Specifically, by providing the thin portion 56, the connecting portion 53 can have higher flexibility than a bendable connecting portion having a constant thickness in the longitudinal direction X, for example.

  Thereby, the insertion plug 1 can make the freedom degree of a deformation | transformation with respect to an input load high with the high flexibility of the connection part 53, and can widen the space | interval of the plug blade 40 which faces. For this reason, the plug 1 can prevent the blade holding member 50 from being easily damaged by an unintended input load, and can improve the workability in the assembling work.

  For example, when the covered electric wire 31 is wound around the connecting portion 53, the thin portion 56 is bent, so that the plug blade holding member 50 prevents the connecting portion 53 from being damaged even if the interval between the plug blades 40 is widened. it can. For this reason, the plug blade holding member 50 can wind the covered electric wire 31 around the connecting portion 53 while increasing the interval between the plug blades 40.

Alternatively, when the plug blade 40 connected by the blade holding member 50 is incorporated into the second mold 3 for forming the outer skin member 20, the plug blade holding member 50 is bent by the thin portion 56 of the connecting portion 53. 2 A dimensional error with the mold 3 can be absorbed.
Thereby, the insertion plug 1 can aim at the improvement of assembly | attachment workability | operativity because the freedom degree of a deformation | transformation in the plug blade holding member 50 becomes high by the high flexibility of the thin part 56. FIG.

  Further, an unintended input load applied to the two plug blades 40 or the two covered electric wires 31 causes the first holding portion 51 and the second holding of the plug blade holding member 50 via the plug blade 40 or the covered electric wire 31. It will act on the part 52. At this time, the blade holding member 50 absorbs the bending and twisting of the connecting portion 53 caused by variations in the input load acting on the first holding portion 51 and the second holding portion 52 by the flexibility of the thin portion 56. be able to.

  In addition, in the case of a connection portion having low flexibility, the degree of freedom of deformation in the plug blade holding member is low, so that the outer skin member 20 can be applied to an unintended input load transmitted through the plug blade holding member. The stopper blade holding member prevents the deformation. For this reason, an unintended input load is difficult to be transmitted and dispersed to the outer skin member 20, and there is a possibility that problems such as disconnection of the conductor 33 occur.

  On the other hand, the flexibility of the thin-walled portion 56 increases the degree of freedom of deformation in the blade holding member 50, so that the outer skin member 20 is moved by the blade holding member 50 against an unintended input load. The deformation can be made more easily without being hindered. For this reason, the plug 1 can reliably transmit and distribute the input load acting on the plug blade holding member 50 to the outer skin member 20 via the plug blade holding member 50.

Thereby, the plug 1 can prevent the plug blade holding member 50 from being damaged or deformed by the unintended input load applied to the plug blade 40 or the covered electric wire 31. That is, the plug 1 prevents the bending stress and tension from acting on the conductor crimping portion 42 of the plug blade 40 and the conductor 33 of the covered electric wire 31, thereby preventing problems such as disconnection of the conductor 33. can do.
Accordingly, the insertion plug 1 is provided with the thin portion 56 in the connecting portion 53, so that it is possible to ensure stable conductivity even when an unintended input load is applied, and to improve the assembling workability.

Further, since the thin portion 56 is configured by the slit 57, it is possible to facilitate the formation of the thin portion 56 and to improve the assembling workability.
Specifically, for example, when a substantially band-shaped thin part is formed at the approximate center in the longitudinal direction X of the connecting part, the connecting part can be easily provided in the same direction in the direction of narrowing and widening the gap between the facing blades 40. Bend. For this reason, when assembling the plug blade 40 connected by the blade holding member into the second mold 3 or winding the covered electric wire 31 around the connecting portion, the interval between the plug blades 40 facing each other is not stable, and the assembling work It becomes a factor to reduce the sex.

  On the other hand, the plug blade holding member 50 can easily form the thin-walled portion 56 by the slit 57 formed on the plug blade 40 side of the connection portion 53 and connect the plug blade 40 in the direction of narrowing the interval between the plug blades 40 facing each other. 53 bends can be regulated.

More specifically, since the gaps between the slits 57 are clogged when the facing blades 40 facing each other, the blade holding member 50 restricts the bending of the connecting portion 53 in the direction of narrowing the space between the facing blades 40. be able to.
On the other hand, when the gap between the facing blades 40 is widened, the gap between the slits 57 is widened. Therefore, the blade holding member 50 can restrict the bending of the connecting portion 53 in the direction of widening the distance between the facing blades 40. Absent.

  Thereby, the blade holding member 50 can facilitate the formation of the thin portion 56 by the slit 57 and the restriction of the bending at the connecting portion 53. For this reason, when the covered electric wire 31 is wound around the connecting portion 53, the plug blade holding member 50 can bend the connecting portion 53 only in the direction of widening the interval between the plug blades 40, thereby making it easier to wind the covered electric wire 31. be able to. Alternatively, when assembling into the second mold 3 forming the outer skin member 20, the plug blade holding member 50 can be assembled with the plug blade 40 being made substantially parallel.

Furthermore, when the covered electric wire 31 is wound around the connecting portion 53, even if the conductor 33 of the covered electric wire 31 is exposed, the insertion plug 1 is restricted from bending in the direction in which the gap between the plug blades 40 facing each other is reduced. Therefore, the conductors 33 can be prevented from contacting each other.
Therefore, the insertion plug 1 can easily configure the thin portion 56 by the slit 57 formed on the plug blade 40 side of the connecting portion 53 and can improve the assembling workability.

  In addition, since the covered electric wire 31 is wound around the first base portion 54 and the second base portion 55, the tension applied to the covered electric wire 31 can be received by the connecting portion 53. At this time, the insertion plug 1 can absorb the tension acting on the connecting portion 53 by bending the thin portion 56 of the connecting portion 53. For this reason, the plug 1 can more reliably prevent the tension from acting directly on the connection portion between the conductor crimping portion 42 of the plug blade 40 and the conductor 33 of the covered electric wire 31.

Thereby, even if an excessive tension is applied to the covered electric wire 31, the insertion plug 1 can stably ensure a good connection state between the plug blade 40 and the covered electric wire 31.
Therefore, the insertion plug 1 can secure more stable conductivity even when an unintended input load is applied by winding the covered electric wire 31 around the connecting portion 53.

Further, since the first base portion 54 and the second base portion 55 are provided with the wire receiving portions 54a and 55a, the covered electric wire 31 can be wound using the wire receiving portions 54a and 55a as a guide. At this time, since the covered electric wire 31 is fitted into the electric wire receiving portions 54 a and 55 a, the insertion plug 1 moves the wound covered electric wire 31 between the first holding portion 51 and the second holding portion 52. Can be regulated. For this reason, the plug 1 can more reliably prevent the conductors 33 from contacting each other even if the conductor 33 of the covered electric wire 31 is exposed.
Therefore, the plug 1 can restrict the movement of the covered wire 31 by the wire receiving portions 54a and 55a, and can ensure stable conductivity even when an unintended input load is applied, and improve the assembly workability. it can.

  Further, since the first holding part 51 and the second holding part 52 are provided with outer peripheral protrusions 51a and 52a and circular concave parts 51b and 52b, the outer skin member 20, the first holding part 51 and the second holding part 52, The contact area can be increased. Furthermore, since the outer skin member 20 and the plug blade holding member 50 are locked by the outer peripheral protrusions 51a and 52a and the circular concave portions 51b and 52b, the plug 1 is brought into close contact with the outer skin member 20 and the plug blade holding member 50. The state can be made stronger.

Thereby, the insertion plug 1 more reliably transmits and distributes the bending stress and tension transmitted to the first holding unit 51 and the second holding unit 52 to the outer skin member 20 when bending stress and tension are applied. be able to.
Therefore, the insertion plug 1 can ensure stable conductivity even when an unintended input load is applied, by the outer peripheral protrusions 51a and 52a and the circular recesses 51b and 52b.

In the above-described embodiment, the blade holding member 50 is made of polypropylene. However, the present invention is not limited to this and may be made of a synthetic resin having insulation properties.
Further, the outer skin member 20 is made of polyvinyl chloride. However, the invention is not limited thereto, and the outer skin member 20 may be made of an appropriate synthetic resin as long as it has insulating properties and is made of a soft resin rather than the plug blade holding member 50.

Moreover, although the electric wire receiving parts 54a and 55a were formed in the 1st base 54 and the 2nd base 55, it is not limited to this, Even if it does not form the electric wire receiving parts 54a and 55a in the 1st base 54 and the 2nd base 55 Good.
Further, the outer peripheral protrusions 51a and 52a and the circular recesses 51b and 52b are formed in the first holding part 51 and the second holding part 52, but the outer protrusions 51a and 52a or the circular recesses 51b and 52b are not limited thereto. Either of these may be formed. Furthermore, it is not necessary to form the outer peripheral protrusions 51a and 52a and the circular recesses 51b and 52b in the first holding part 51 and the second holding part 52.

In addition, the outer peripheral projections 51a and 52a are formed so that the predetermined ranges of the first holding part 51 and the second holding part 52 bulge outward. It is good also as the protrusion shape etc. which protruded.
Moreover, although the circular recessed parts 51b and 52b were formed in planar view substantially circular shape which has predetermined depth in the up-down direction, it is good not only as this but groove | channel shape which has predetermined depth.

In correspondence between the configuration of the present invention and the above-described embodiment,
The conductor connection portion of the present invention corresponds to the conductor crimping portion 42 of the embodiment,
Similarly,
The thickness direction corresponds to the width direction Y,
The holding unit corresponds to the first holding unit 51 and the second holding unit 52,
Soft resin corresponds to polyvinyl chloride,
The thin portion corresponds to the thin portion 56,
The semicircular recess corresponds to the wire receiving portions 54a and 55a, and the convex corresponds to the outer peripheral protrusions 51a and 52a.
The recess corresponds to the circular recess 51b, 52b,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

  The present invention can be applied to an insertion plug having one end connected to an electric device such as an electric tool or a household appliance.

DESCRIPTION OF SYMBOLS 1 ... Plug 20 ... Outer skin member 31 ... Covered electric wire 32 ... Insulation coating 33 ... Conductor 40 ... Plug blade 42 ... Conductor crimping part 50 ... Plug blade holding member 51 ... 1st holding part 51a ... Outer peripheral protrusion 51b ... Circular recessed part 52 ... 2nd holding | maintenance part 52a ... Outer peripheral protrusion 52b ... Circular recessed part 53 ... Connection part 54 ... 1st base 54a ... Electric wire receiving part 55 ... 2nd base 55a ... Electric wire receiving part 56 ... Thin part 57 ... Slit X ... Longitudinal direction Y ... Width direction

Claims (5)

Two covered electric wires in which a conductive conductor is covered with an insulating insulating coating;
Two substantially blade-like plug blades having at one end a conductor connecting portion that allows connection of the conductor exposed for a predetermined length in the longitudinal direction of the covered electric wire;
A plug blade integrally formed with a holding portion for holding at least the conductor connecting portions in the plug blades juxtaposed with the flat portions facing each other in the thickness direction of the plug blade, and a connecting portion for connecting the holding portions in the thickness direction A holding member;
An insertion plug provided with a skin member made of a soft resin that covers at least the plug blade holding member,
In the approximate center of the connecting portion in the thickness direction,
An insertion plug having a thin portion in which the thickness in the longitudinal direction is thin. The connecting portion,
Formed on the covered electric wire side in the holding part,
The thin-walled portion,
The insertion plug according to claim 1, wherein the insertion plug is formed by a slit recessed in a slit shape from the plug blade side of the connecting portion toward the covered electric wire side along the longitudinal direction. In the connecting portion, a portion interposed between the holding portion and the thin portion is a first base and a second base,
The two covered electric wires exposed from the holding portion are
Wrap around the first base and the second base,
The outer skin member,
The insertion plug according to claim 1 or 2, wherein the plug blade holding member and the covered electric wire wound around are covered. On the plug blade side in the first base and the second base,
The insertion plug according to claim 3, further comprising a semicircular recess formed in a substantially semicircular shape substantially equal to the outer diameter of the covered electric wire and recessed in the longitudinal direction. In the holding part,
The insertion plug according to any one of claims 1 to 4, further comprising a convex portion projecting from the peripheral surface and / or a concave portion concaved on the peripheral surface.

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