JPH09180814A - Electric connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection device which does not suffer a load upon its blade receiving spring due to decrease in plng inclination. SOLUTION: A sectional, recess-shaped plug-in part is protruded at a plug. A plug blade is provided along both side faces of said plug-in part and a grounding plug blade is provided along the bottom of the recess part. A receptacle 6 is provided with a plug-in port in which said plug-in part provided at the receptacle 6 is be plugged. A blade receiving spring 8 is provided opposite to both sides of the inside of the receptacle 6. A grounding pole blade receiving spring 9 is provided at the center of the inside of the receptacle 6. The width of the grounding pole blade receiving spring 9 is almost equal to the groove width of the recess part of the plug-in part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connecting device composed of a plug and an outlet.

[0002]

2. Description of the Related Art Conventionally, as an electrical connection device for stage lighting or the like, a plug 1 as shown in FIG. 8 is provided with a projection 2 having a concave cross section, and plug blades 3 are provided on both sides of the plug 2. A plug insertion port 7 into which the insertion portion 2 provided in the plug 1 is inserted into the outlet 6 as shown in FIGS. 11 and 12 along with the ground electrode plug blade 5 along the bottom of the recess 4.
The blade receiving springs 8 are provided on both sides inside the outlet 6 so as to face each other, the blade receiving spring 9 for the ground electrode is provided at the center of the inside of the outlet 6, and the insertion portion 2 of the plug 1 is connected to the plug insertion port 7 of the outlet 6. Plug blades 3 provided on both sides of the insertion portion 2 are elastically contacted with the blade receiving springs 8 facing each other, and contacted with the ground electrode plug blades 5 provided on the bottom of the recess 4 of the insertion portion 2. It is known that the blade receiving spring 9 for the ground electrode in the central portion of the inside of the outlet 6 is elastically brought into contact with it. Here, in the prior art, as shown in FIG. 13, the width of the ground electrode blade receiving spring 9 is considerably smaller than the groove width of the recess 4 of the insertion portion 2. 14 and 15 show conventional examples of the blade receiving spring 8 and the ground electrode blade receiving spring 9, respectively.

[0003]

In the above-mentioned conventional example, an abnormal insertion / removal is performed when inserting / removing the insertion portion 2 of the plug 1 (that is, the plug 1 is inserted in an inclined state). When the plug 1 is tilted and the plug is abnormally inserted or removed, an abnormal force acts on the blade receiving spring 8 to deform the blade receiving spring 8. There was a problem of getting bigger.

Further, in the prior art, the portion of the blade receiving spring 8 on the plug insertion port 7 side of the outlet 6 is inclined obliquely inward from the inner surface of the plug insertion port 7 as shown in FIG. Therefore, at the final stage of pulling out, the plug 1 may be pulled out while being slanted as shown in FIG. 13, which causes a problem that a large force is applied to the blade receiving spring 8.

The present invention has been made in view of the above-mentioned problems of the prior art. The inclination of the plug is reduced so that the blade receiving spring is not burdened, and the blade receiving portion near the plug insertion opening is provided. An object of the present invention is to provide an electrical connection device capable of preventing the spring portion from being deformed.

[0006]

In order to solve the problems of the above-mentioned conventional example and to achieve the object of the present invention, in the electrical connecting device of the present invention, a plug 1 is provided with a protruding portion 2 having a concave cross section. Then, the plug blades 3 are provided along both sides of the insertion portion 2 and the ground electrode plug blades 5 are provided along the bottom of the concave portion 4, and the outlet 6
Is provided with a plug insertion port 7 into which the insertion portion 2 provided in the plug 1 is inserted, and blade receiving springs 8 are provided on both sides inside the outlet 6 so as to face each other, and a blade receiving spring 9 for a ground electrode is provided in the center of the inside of the outlet 6. It is characterized in that the width of the ground electrode blade receiving spring 9 is made substantially equal to the groove width of the recess 4 of the insertion portion 2. By adopting such a configuration, it is possible to prevent the plug 1 from tilting with respect to the outlet 6 by inserting the ground electrode blade receiving spring 9 into the recess 4 of the insertion portion 2.

Further, the plug 1 is provided with a plug-in portion 2 having a concave cross-section, the plug blades 3 are provided along both sides of the plug-in portion 2, and a ground electrode plug blade 5 is provided along the bottom of the recess 4. A plug insertion port 7 into which the insertion portion 2 provided in the plug 1 is inserted is provided along the outlet 6, and blade receiving springs 8 are provided on both sides inside the outlet 6 so as to face each other, and a ground electrode is provided at the center of the inside of the outlet 6. Inclination for preventing the inclination of the insertion portion 2 by providing blade receiving springs 9 on both sides of the inside of the outlet 6 in parallel with the insertion direction of the insertion portion 2 of the plug 1 to regulate the position of the side surface of the insertion portion 2. The prevention rib 10 may be provided so as to be vertically offset from the blade receiving spring 8. With such a configuration, the tilt prevention rib 10 prevents the plug 1 from tilting with respect to the outlet 6.

Further, the plug 1 is provided with a plug-in portion 2 having a concave cross-section, the plug blades 3 are provided along both sides of the plug-in portion 2, and the ground electrode plug blade 5 is provided along the bottom of the recess 4. A plug insertion port 7 into which the insertion portion 2 provided in the plug 1 is inserted is provided along the outlet 6, and blade receiving springs 8 are provided on both sides inside the outlet 6 so as to face each other, and a ground electrode is provided at the center of the inside of the outlet 6. A blade receiving spring 9 is provided, and a portion of the blade receiving spring 8 on the side of the plug insertion port 7 of the outlet 6 is located outside the extension line of the inner surface of the plug insertion port 7 and located in the plug 1 insertion direction. An elastic contact portion 12 is provided to extend continuously toward the plug portion 3 and elastically contact the plug blade 3 on the side surface of the insertion portion 2 in the insertion direction of the plug 1 with respect to the escape portion 11.
May be provided, and the elastic contact portion 12 is displaced inward from the extension line of the inner surface of the plug insertion port 7. With such a configuration, even if the tip of the plug 1 is twisted obliquely near the plug insertion port 7 at the final stage of pulling out the plug 1, the tip of the plug 1 can be escaped by the escape portion. become.

Then, a combination of a structure in which the width of the ground electrode blade receiving spring 9 is substantially equal to the groove width of the recess 4 of the insertion portion 2 and a structure in which the inclination preventing rib 10 is provided, and the ground electrode. A structure in which the width of the blade receiving spring 9 is substantially equal to the groove width of the recess 4 of the insertion portion 2 and a structure in which the relief portion 11 is provided, or a structure in which the tilt prevention rib 10 is provided, A portion having a configuration in which the portion 11 is provided, or the width of the ground electrode blade receiving spring 9 is inserted into the insertion portion 2
It is also preferable to have both the structure in which the groove width of the concave portion 4 is substantially equal, the structure in which the tilt preventing rib 10 is provided, and the structure in which the relief portion 11 is provided. With such a configuration, the blade receiving spring 8 can be further prevented from being deformed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. 8 to 10 show the plug 6 used in the electrical connecting device of the present invention. The plug 6 is provided with an insertion portion 2 having a concave cross section.
The plug portions 3 are provided along both sides of the insertion portion 2, and the ground electrode plug blades 5 extend along the bottom of the recess 4 of the insertion portion 2.
Is installed alongside. On these plug blades 3 and the ground electrode blade 5, three electric wires 14 of a cord 13 inserted into the plug 12 from the cord insertion opening 1a provided in the plug 6 are provided.
They are connected inside each.

The outlet 6 has a structure as shown in FIGS. That is, the outer shell of the outlet 6 is constructed by covering the body 20 with the cover 21 and fixing it with the assembly screw 31. The body 20 is provided with three connecting portion fitting portions 61 for fitting the connecting portion 41b of the terminal board 41 (two on one side portion, one on the other side portion, a total of three),
The connection portions 41b of the three terminal plates 41 are fitted in the respective connection portion fitting portions 61. The support plate receiving portion 6 is provided on the body 20 inside the respective connecting portion fitting portions 61.
2 is provided and the support plate 63 is fitted therein. The body 20 is provided with a washer housing portion 44 between each fitting portion fitting portion 61 and the support plate receiving portion 62, and the washer 42 is housed in the washer housing portion 44.
Here, the terminal screw 43 is inserted into the hole 64 of the connecting portion 41b and screwed into the screw hole 65 of the washer 42, and the washer 42 is only moved in the washer housing portion 44 in the moving direction by the terminal screw 43. It is freely movable. In this way, by providing the washer housing portion 44 that movably houses the washer 42 only in the moving direction of the terminal screw 43 on the body 20, the terminal screw 43 can be simply loosened without removing the terminal screw 43 for indoor wiring. It is possible to connect the vinyl-coated electric wire between the washer 42 and the connection portion 41b of the terminal plate 41, and then tighten the terminal screw 43 to connect the wire.
It is also possible to wind the electric wire around the terminal screw 43 between the washer 42 and the connection portion of the terminal plate 41 in a state where it is loosened without removing 3, and then connect the terminal screw 43 by tightening the terminal screw 43. 43 and the washer 4
2 is a state in which the crimp terminal having a screw insertion hole is inserted between the washer 42 and the connection portion of the terminal plate 41 while being stored in the washer storage portion 44, and then the terminal screw 43 is connected to the connection hole and the crimp terminal screw. Various connections can be made by screwing the washers 42 through the insertion holes to connect them.

As shown in FIG. 2, the outlet 6 is provided with through holes 45 penetrating both the front and back sides. One opening of the through hole portion 45 serves as a plug insertion port 7 into which the insertion portion 2 provided in the plug 1 is inserted. A positioning central projection 27 is provided at the center of one inner wall of the plug insertion port 7. The contacts 41a provided on the terminal plates 41 located on both sides are located on both side walls of the outlet 6.
Further, the blade receiving spring 8 is arranged inside the contact 41a. In addition, in the central portion of the outlet 6, a ground electrode blade receiving spring 9 that is integrally extended from the ground electrode terminal plate 41c.
Is located.

The blade receiving spring 8 has a substantially U shape, and is shown in FIG.
The following is used. A contact 69 is provided at one end of the blade receiving spring 8 so as to face the contact 41a of the terminal plate 41, and the other end is attached to the body 20. As shown in FIG. 2, the portion of the blade receiving spring 8 on the side of the plug insertion port 7 of the outlet 6 has a plug insertion port 7
It is positioned so as to be shifted outward from the extension line of the inner surface, and the escape portion 11 is provided by extending this portion toward the inserting direction of the plug 1. An elastic contact portion 12 for elastically contacting the plug blade 3 on the side surface of the insertion portion 2 is provided in the insertion direction of the plug 1 rather than the escape portion 11.
2 is a position shifted inward from the extension line of the inner surface of the plug insertion port 7. The contact point 69 has the elastic portion 12
It is located at the end of the blade receiving spring 8 further displaced in the plug 1 insertion direction.

Tilt prevention ribs 10 parallel to the insertion direction of the insertion portion 2 of the plug 1 are provided above and below the double-edged blade receiving springs 8 on both sides inside the outlet 6.
0 is substantially flush with the plug insertion port 7. Here, the distance between the inclination preventing ribs 10 on both sides is set to be substantially equal to the width of the insertion portion 2 of the plug 1 (actually, slightly shorter).

Further, as the blade receiving spring 9 for the ground electrode provided in the central portion inside the outlet 6, the one as shown in FIG. 7 is used. The width of the ground electrode blade receiving spring 9 is set to be substantially equal to the groove width of the recess 4 of the insertion portion 2. Then, the insertion portion 2 of the plug 1 is connected to the plug insertion opening 7
At the time of inserting or pulling out from above, the upper and lower portions on both sides of the insertion portion 2 (in the embodiment, the upper and lower portions of the blades on both sides) are respectively guided by the tilt preventing ribs 10 provided on the upper and lower sides of the both sides. The recess 4 is inserted while being guided by the ground electrode blade receiving spring 9. As a result, the plug 1 is inserted and removed while preventing the inclination of the plug 1 as much as possible by the guide of the side surface of the insertion portion 2 by the inclination prevention rib 10 and the guide of the recess 4 by the ground electrode blade receiving spring 9. The elastic contact portion 12 of the blade receiving spring 8 is the blade 3
Is elastically contacted in a normal state, or the insertion portion 2 is pulled out in a normal posture, so that the blade 3 is separated from the blade receiving spring 8 without difficulty. Therefore, an excessive force is not applied to the blade receiving spring 8 when the blade receiving spring 8 is inserted or removed, and the blade receiving spring 8 is not deformed excessively.

When pulling out the insertion portion 2 of the plug 1, if the tip of the insertion portion 2 comes close to the plug insertion opening 7 at the last stage, it becomes easy to twist the plug 1 obliquely as shown in FIG. Also in this case, as described above, the blade receiving spring 8 is located at a position on the side of the plug insertion port 7 of the outlet 6 which is offset from the extension line of the inner surface of the plug insertion port 7 and the plug portion is located at the position. 1 Since the relief portion 11 is provided continuously extending in the inserting direction, the inclined insertion portion 2 does not hit the relief portion 11 and the portion of the blade receiving spring 8 on the plug insertion port 7 side is forcibly twisted. It does not deform.

In the above embodiment, the width of the ground electrode blade receiving spring 9 is used as the outlet 6 and the recess 4 of the insertion portion 2 is used.
The configuration having both the groove width substantially equal to the groove width, the configuration in which the tilt prevention rib 10 is provided, and the configuration in which the relief portion 11 is provided have been described, but the configuration is not necessarily limited to this embodiment, and illustration is omitted. However, the blade receiving spring for the ground electrode 9
Has a structure in which the width of the groove is substantially equal to the groove width of the recess 4 of the insertion portion 2 and a structure in which the tilt prevention rib 10 is provided, and the width of the ground electrode blade receiving spring 9 is smaller than that of the recess 4 of the insertion portion 2. It may have both a structure having a groove width substantially equal to that of the groove 11 and a structure having the relief portion 11, or a structure having the inclination preventing rib 10 and a structure having the relief portion 11. , Only the structure in which the width of the receiving spring 9 is substantially equal to the groove width of the recess 4 of the insertion part 2, or only the structure in which the inclination preventing rib 10 is provided, or only the structure in which the escape portion 11 is provided. May be

A lid 80 is detachably attached to the other opening of the through hole portion 45 penetrating both the front and back surfaces of the outlet 6. As described above, the socket 6 is provided with the through-hole portion 45 penetrating both the front and back sides, and one opening portion of the through-hole portion 45 is used as the plug insertion port 7 and the other opening portion is shielded by the detachable lid 80. When the outlet 6 is used as a floor outlet (that is, a floor outlet), the lid 80 is removed and used. By using the lid 80 when used as a floor outlet, for example, for stage lighting. Even if the plug insertion opening 7 is wide due to the pole arrangement, such as a wiring device, since it is a through hole, it is possible to prevent dust and the like from accumulating inside. On the other hand, when used as a wall-embedded outlet, a lid is attached to the other opening of the through hole portion 45 to shield it. By doing so, it is possible to prevent electric wires and the like from entering the through-hole portion 45 from the back surface side, as in the case of an outlet that does not have a normal through-hole portion.

[0019]

According to the first aspect of the present invention, as described above, the plug is provided with the insertion portion having a concave cross section, and the blades are provided along both sides of the insertion portion. Along with the bottom of the recess, along with the ground electrode plug blade, the outlet is provided with a plug insertion port into which the insertion part provided in the plug is inserted, and blade receiving springs are provided on both sides inside the outlet to face each other. Since the blade receiving spring for the ground electrode is provided in the center of the and the width of the blade receiving spring for the ground electrode is made substantially equal to the groove width of the recess of the insertion portion, the blade receiving spring for the ground electrode is provided in the recess of the insertion portion. It is possible to prevent the plug from tilting with respect to the outlet when it is inserted, and to prevent the blade receiving spring from being deformed unintentionally due to the insertion part being inclined and removed, so that the blade receiving spring is not overloaded. Is.

According to the second aspect of the present invention, the plug is provided with a projecting insertion portion having a concave cross section, the blades are provided along both sides of the insertion portion, and the ground is provided along the bottom of the depression. Along with the pole plug blade, the outlet is provided with a plug insertion port into which the insertion part provided in the plug is inserted, the blade receiving springs are provided facing each other inside the outlet, and the ground electrode blade is provided in the center of the outlet. A receiving spring is provided, and both sides of the inside of the outlet are parallel to the insertion direction of the insertion part of the plug and the tilt prevention ribs to prevent the inclination of the insertion part by regulating the position of the side surface of the insertion part Since the position is shifted in the direction, the tilt prevention ribs prevent the plug from tilting with respect to the outlet, and prevent the blade receiving spring from being deformed unduly when the insertion part is tilted and inserted. Blade receiver Are those that can be as burden to the spring is not applied.

According to the third aspect of the present invention, the plug is provided with a plug-in portion having a concave cross-section, the plug blades are provided along both sides of the plug-in portion, and the ground electrode is provided along the bottom of the recess. Along with the plug blade, a plug insertion port into which the insertion part provided in the plug is inserted is provided in the outlet, blade receiving springs are provided facing both sides inside the outlet, and a blade holder for the ground electrode is provided in the center of the outlet. A spring is provided, the part of the blade receiving spring on the side of the plug insertion port of the outlet is displaced outside the extension line of the inner surface of the plug insertion port, and the part is extended toward the plug insertion direction to provide an escape portion. , The elastic contact portion for elastically contacting the plug blade on the side surface of the insertion portion in the plug insertion direction than the relief portion is provided, and the elastic contact portion is displaced inward from the extension line of the inner surface of the plug insertion port, Pulling out the plug Even if there is a case where the plug is tilted and twisted strongly at the stage, the inclined insertion part does not hit the above-mentioned relief part, and the part of the blade receiving spring on the plug insertion side side is not deformed due to unreasonable prying. The blade receiving spring can be prevented from being excessively deformed so that the blade receiving spring is not overloaded.

According to the invention of claim 4, in addition to the effect of the invention of claim 2, blade receiving springs are provided on both sides inside the outlet so as to face each other, and a ground electrode is provided in the center of the inside of the outlet. Since the blade receiving spring for the ground electrode is provided and the width of the blade receiving spring for the ground electrode is made substantially equal to the groove width of the recessed portion of the insertion portion, the blade receiving spring is further prevented from being deformed unnecessarily and the blade receiving spring is not overloaded. It can be prevented.

According to the invention of claim 5, in addition to the effect of the invention of claim 3, blade receiving springs are provided on both sides inside the outlet so as to face each other, and a ground electrode is provided at the center of the inside of the outlet. Since the blade receiving spring for the ground electrode is provided and the width of the blade receiving spring for the ground electrode is made substantially equal to the groove width of the recessed portion of the insertion portion, the blade receiving spring is further prevented from being deformed unnecessarily and the blade receiving spring is not overloaded. It can be prevented.

According to the invention of claim 6, in addition to the effect of the invention of claim 3, blade receiving springs are provided on both sides inside the outlet so as to face each other, and a ground electrode is provided in the center of the inside of the outlet. Blade support springs are provided, and anti-tilt ribs are installed on both sides of the inside of the outlet in parallel to the insertion direction of the plug insertion part to regulate the position of the side surface of the insertion part and prevent the insertion part from tilting. Since the blade receiving springs are vertically displaced, the blade receiving springs can be prevented from being excessively deformed so that the blade receiving springs are not overloaded.

In addition to the effect of the invention according to claim 3, in addition to the effect of the invention according to claim 3, blade receiving springs are provided opposite to each other inside the outlet, and a ground electrode is provided in the center of the inside of the outlet. Blade receiving springs are provided, the width of the ground electrode blade receiving springs is made substantially equal to the groove width of the recessed portion of the insertion portion, the blade receiving springs are provided facing each other on both sides inside the outlet, and the center is grounded inside the outlet. A blade support spring for poles is provided, and the anti-tilt ribs that prevent the inclination of the insertion part are provided on both sides inside the outlet in parallel with the insertion direction of the insertion part of the plug to regulate the position of the side surface of the insertion part. Since it is provided so as to be vertically displaced from the spring, it is possible to prevent the blade receiving spring from being deformed more unnecessarily to prevent the blade receiving spring from being overloaded.

[Brief description of the drawings]

FIG. 1 is a plan view of an outlet used in the present invention with a cover removed.

FIG. 2 is a sectional view of the same.

FIG. 3 is an explanatory view when the insertion portion of the above is tilted and twisted when pulled out.

FIG. 4 is an exploded perspective view of the above outlet.

FIG. 5 is a partially exploded perspective view of the above.

FIG. 6 shows a blade receiving spring used in the same as above, (a) is a plan view, (b) is a front view, (c) is a side view, and (d) is a perspective view.

FIG. 7 shows a blade receiving spring for a ground electrode used in the above,
(A) is a plan view, (b) is a front view, (c)
Is a side view and (d) is a perspective view.

FIG. 8 is a perspective view of a plug used in the above.

FIG. 9 is a perspective view showing a state in which the above cover is removed.

FIG. 10 is a plan view showing a state in which the above cover is removed.

FIG. 11 is a plan view showing a state in which a cover of a conventional outlet is removed.

FIG. 12 is a sectional view of the above.

FIG. 13 is an explanatory view when the insertion portion is pulled out and tilted when being pulled out.

FIG. 14 shows another example of the blade receiving spring used in the above,
(A) is a plan view, (b) is a front view, (c)
Is a side view and (d) is a perspective view.

FIG. 15 shows another example of a ground electrode blade receiving spring used in the above, (a) is a plan view, (b) is a front view,
(C) is a side view and (d) is a perspective view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug 2 Insert part 3 Plug blade 4 Recessed part 5 Ground electrode plug blade 6 Outlet 7 Plug insertion port 8 Blade receiving spring 9 Ground electrode blade receiving spring 10 Tilt prevention rib 11 Relief part 12 Elastic contact part

Claims (7)

[Claims] 1. A plug is provided with a plug-in part having a concave cross-section, a plug blade is provided on both sides of the plug-in part, and a ground electrode plug-blade is provided along the bottom of the recess to connect to an outlet. A plug insertion port into which the insertion part provided in the plug is inserted is provided, blade receiving springs are provided opposite to each other inside the outlet, and a ground electrode blade receiving spring is provided in the center of the outlet, and the ground electrode blade receiving An electrical connection device characterized in that the width of the spring is substantially equal to the groove width of the recess of the insertion portion. 2. A plug is provided with a plug-in portion having a concave cross-section, a plug blade is provided along both sides of the plug-in portion, and a ground electrode plug blade is provided along the bottom of the recess to connect to an outlet. A plug insertion port into which the insertion part provided in the plug is inserted is provided, blade receiving springs are provided opposite to each other inside the outlet, a blade receiving spring for the ground electrode is provided in the center inside the outlet, and plugs are provided on both sides inside the outlet. In parallel with the insertion direction of the insertion part, a side wall of the insertion part is regulated to prevent the inclination of the insertion part, and an anti-tilt rib is provided vertically offset from the blade receiving spring. Characteristic electrical connection device. 3. A plug is provided with a plug-in part having a concave cross-section, a plug blade is provided on both sides of the plug-part, and a ground electrode plug-blade is provided along the bottom of the recess to connect to an outlet. A plug insertion port into which the insertion part provided in the plug is inserted is provided, blade receiving springs are provided facing each other on both sides inside the outlet, and a blade receiving spring for the ground electrode is provided in the center inside the outlet. The part on the plug insertion port side is positioned outside the extension line of the inner surface of the plug insertion port, and the part is continuously provided in the plug insertion direction to provide a relief portion, which is closer to the plug insertion direction than the relief portion. An electrical connecting device, wherein an elastic contact portion for elastically contacting a blade on a side surface of the insertion portion is provided, and the elastic contact portion is displaced inward from an extension line of an inner surface of the plug insertion port. 4. A blade receiving spring is provided on both sides inside the outlet so as to face each other, a blade receiving spring for a ground electrode is provided at a central portion inside the outlet, and a width of the blade receiving spring for the ground electrode is provided in a groove of a recessed portion of the insertion portion. The electrical connection device according to claim 2, wherein the electrical connection device has a width substantially equal to the width. 5. A blade receiving spring is provided opposite to each other inside the outlet, a blade receiving spring for a ground electrode is provided in a central portion inside the outlet, and a width of the blade receiving spring for the ground electrode is provided in a groove of a recessed portion of the insertion portion. The electrical connection device according to claim 3, wherein the electrical connection device has a width substantially equal to the width. 6. A blade receiving spring is provided on both sides inside the outlet so as to be opposed to each other, and a blade receiving spring for a ground electrode is provided at a central portion inside the outlet, and is parallel to the inserting direction of the plug inserting portion on both sides inside the outlet. 4. The electrical connection according to claim 3, wherein a tilt preventing rib for preventing the tilt of the inserting portion by regulating the position of the side surface of the inserting portion is provided so as to be vertically displaced from the blade receiving spring. apparatus. 7. A blade receiving spring is provided on both sides inside the outlet so as to face each other, a blade receiving spring for a ground electrode is provided at a central portion inside the outlet, and a width of the blade receiving spring for the ground electrode is provided in a groove of a recessed portion. The width is almost the same, the blade receiving springs are installed opposite to each other inside the outlet, the blade receiving spring for the ground electrode is provided in the center inside the outlet, and it is parallel to the insertion direction of the plug insertion part on both sides inside the outlet. 4. The electricity according to claim 3, further comprising: an inclination preventing rib for restricting a position of a side surface of the insertion portion to prevent inclination of the insertion portion, the rib being displaced vertically from the blade receiving spring. Connection device.