JP2011008974A - Connection structure of insertion plug to socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise a tracking prevention effect in a connection structure between a power plug and a socket, especially the power plug and the linear socket.SOLUTION: The insertion plug 10 is connected to the linear socket 30 having a pair of power receiving grooves 32 internally equipped with a power blade rest 34, and a receiving groove 23 for grounding internally equipped with a blade rest 35 for grounding. The insertion plug 11 includes an insulating plate 21 between a pair of power plug blades 12. The insulating plate 21 is received in a receiving groove 13 for grounding while it is inserted into the linear socket 30.

Description

  The present invention relates to a connection structure of an insertion plug to a linear outlet, and an insertion plug suitable for the connection structure.

  Conventionally, as shown in Patent Documents 1 and 2, a plug for power supply has a recess or projection formed in a plug body in which a pair of insertion blades protrudes from the tip surface, and is formed on the tip surface. It has been proposed to prevent tracking between the insertion blades by increasing the creepage distance between the insertion blades by the concave portions or the convex portions. When the recess is formed in the plug body of the plug, it can be surely inserted until the tip surface of the plug body comes into contact with the tip surface of the outlet. However, as shown in FIGS. 5 and 6 of Patent Document 2, when a plurality of protrusions are formed as the above-described convex portions, the tips of the protrusions come into contact with the tip surface of the outlet. As a result, the insertion blade of the insertion plug cannot be inserted sufficiently deep, and the insertion blade is exposed from the front end surface of the outlet, which may cause tracking due to dust accumulation or the like. In particular, the longer the height of the ridge, the longer the creepage distance, the longer the exposed length of the insertion blade from the tip of the outlet, and the longer the height of the ridge, There is a limit in increasing the creepage distance by increasing the protrusion height of the ridge, because it is unacceptable by the blade receptacle of the outlet.

  On the other hand, there are many types of outlets, and there are those called linear outlets or rail outlets as shown in Patent Document 3. This type of outlet is often used to provide power for lighting such as wall display shelves and showcases. Since it can be seen that it is used in the accumulated state, it is considered that a means for preventing tracking is necessary, but at present, no effective solution has been implemented.

JP 2001-196124 A Japanese Patent Laid-Open No. 10-241775 No. 7-18146

  The present invention has a connection structure between a power plug and an outlet, in particular, a power plug and a linear outlet, and an object thereof is to enhance the tracking prevention effect.

The present invention includes a pair of left and right power receiving grooves each having a power blade holder therein, and a ground receiving groove having a ground blade holder therein, and the gap between the pair of left and right power receiving grooves. The above-mentioned receiving grooves for grounding are formed, and these receiving grooves are three grooves extending in the front-rear direction and opened in the front end surface of the outlet casing, and are linearly arranged in parallel to each other. In the connection structure between the outlet and the power plug having a pair of power plug blades protruding from the front end surface of the plug main body, the plug includes an insulating plate protruding from the front end surface of the plug main body, and the insulation The plate is located on a line segment connecting the pair of power supply blades, and the pair of power supply blades are received in the pair of power supply reception grooves, and the grounding reception groove is provided. That the insulation plate has been received. It provides a connection structure for attachment plug for linear outlet to symptoms.
The plug includes a grounding plug blade in front of or behind the insulating plate, and the pair of power supply blades are received in the pair of power receiving grooves, and the insulating plate is inserted in the grounding receiving groove. And the above-mentioned grounding blade can be received.
The present invention also relates to a power plug having a pair of power plug blades projecting from the front end surface of the plug body, a pair of left and right power supply receiving grooves having a power blade receiver therein, and a grounding plug. A grounding receiving groove having a blade receiver therein, the grounding receiving groove is formed between the pair of left and right power receiving grooves, and these receiving grooves are formed on the front end surface of the outlet casing. In the plug plug for a linear outlet that can be inserted into a linear outlet that has three open grooves extending in the front-rear direction and that are arranged in parallel to each other, protrudes in the distal direction from the distal end surface of the plug body. The insulating plate is positioned on a line segment connecting the pair of power supply blades, and is positioned in the center between the pair of power supply blades in the left-right direction. Yes, above A plug socket for a linear outlet, wherein the insulating plate is received in the grounding receiving groove in a state where the pair of power supply blades are inserted into the pair of power receiving grooves in the socket. Provide Katsura.
In this plug, the insulating plate is provided integrally with the plug main body, the grounding plug blade is provided in front of or behind the insulating plate, and the pair of power plug blades are received in the pair of power receiving grooves. In this state, the insulating plate and the grounding blade can be received in the grounding receiving groove.
In addition, the insulating plate is formed separately from the plug body, and can be used for a power outlet without a grounding receiving groove by being able to protrude and detach from the plug body. . In order to achieve the same purpose, the insulating plate may be provided integrally with the plug body, and a weakened portion may be provided at the base of the insulating plate, and the distal end side of the insulating plate may be folded from the weakened portion.

  The present invention is a connection structure between a power plug and an outlet, in particular, a power outlet and a linear outlet provided with a receiving groove for grounding, and is inserted until the front end surface of the power plug and the front end surface of the outlet are in contact with each other. It can be used in a state in which the power supply can be reliably connected, and at the same time, the tracking prevention effect can be enhanced. In addition, the present invention has been able to provide a power plug that can be used for a linear outlet provided with a grounding receiving groove to realize reliable power connection and prevention of tracking. Further, according to the invention of claim 5 or 6, a power plug that can be used for an outlet without a grounding receiving groove can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a use state of a linear outlet and an insertion plug according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a connection state of the linear outlet and the insertion plug, and FIG. FIG. 4 is a perspective view of the plug, and FIG. 4 is a perspective view showing the internal structure. In the description of the present application, front, rear, left, and right only indicate relative positional relationships, and do not specify an absolute position.

  First, the rail outlet 30 will be described with reference to FIGS. 1 and 2. The rail outlet 30 is used for supplying power to an electric appliance 38 such as a plurality of lighting fixtures on a shelf or a showcase provided on a wall surface, and includes a casing 31 and a cord 36 extended therefrom. Is provided. The casing 31 is generally elongated in a straight line, and a pair of left and right power receiving grooves 32 and a grounding receiving groove 33 arranged between the left and right power supply receiving grooves 32 are opened on the front end surface 37 thereof. A power blade receiver 34 is arranged inside the power receiving groove 32, and a ground blade receiver 35 is arranged inside the ground receiving groove 33. The power supply blade receiver 34 and the grounding blade receiver 35 are elongated in parallel with each other along the longitudinal direction of the casing 31, and each is connected to a cord 36 and connected to a main power supply (not shown). As a result, power can be supplied to any position in the longitudinal direction when the plug is inserted.

  Next, the plug 10 will be described with reference to FIGS. The plug 10 is connected to the plug body 11, two power plug blades 12 and one grounding plug blade 13 provided so as to protrude from the most distal surface 18 of the plug body 11, and to the plug 10. Two power cords 15 and one ground cord 16 are provided. A holding member 14 is arranged in the plug body 11, and the power plug blade 12 and the grounding plug blade 13 are supported on the holding member 14 and are connected to the power cord 15 and the ground cord 16 to be covered. 17 is insert-molded. The holding member 14 and the covering portion 17 are made of non-conductive synthetic resin. By forming the holding member 14 to be harder than the covering portion 17, it is possible to achieve both the holding strength of the power plug blade 12 and the grounding plug blade 13 and the flexibility of the cord.

The grounding blade 13 is located in the center between the left power blade 12 and the right power blade 12 in the left-right direction, and is located behind the power blade 12 in the front-rear direction. It may be located forward.
The plug 10 includes an insulating plate 21 that protrudes from the most distal surface 18 of the plug body 11. The insulating plate 21 is also made of non-conductive synthetic resin, like the holding member 14 and the covering portion 17, but may be formed of other non-conductive materials.

  The insulating plate 21 is formed in parallel with the power plug blade 12 and the grounding plug blade 13, and similarly to the grounding plug blade 13, the left power plug blade 12 and the right power plug blade 12 in the left-right direction, Are arranged on the straight line of the grounding plug blade 13. In the front-rear direction, the insulating plate 21 is positioned on a line segment connecting the pair of left and right power plug blades 12 and the power plug blade, and in this example is positioned in front of the grounding plug blade 13. The width in the front-rear direction of the grounding blade 13 is set to be equal to or longer than the width in the front-rear direction of the power plug blade 12, and the insulating plate 21 is always on a straight line connecting the pair of power supply blades 12. It is desirable to be positioned.

  The length of the insulating plate 21 (the distance between the base end and the tip end) may be substantially equal to that of the grounding plug blade 13, but may be shorter than this. Since the creeping distance between the left and right power plug blades 12 is determined by the length of the insulating plate 21, it is advantageous to make the insulating plate 21 longer, but if it is too long, the plug 10 is connected to the rail outlet 30. Since the insulating plate 21 may hit the bottom of the ground receiving groove 33 when the plug is inserted, the plug blade may not be completely received by the blade receiver. On the other hand, the insulating plate 21 can be shortened. By providing the insulating plate 21 with a small length, the tracking prevention performance is improved as compared with the case where the insulating plate 21 is not provided. Accordingly, the length of the insulating plate 21 does not have to reach the grounding blade receiver 35 when the plug 10 is inserted into the rail outlet 30, and at least as long as it is inserted into the grounding receiving groove 33. Good.

  The thickness of the insulating plate 21 in the left-right direction is preferably substantially the same as or thinner than the grounding plug blade 13. If the thickness is smaller than that of the grounding plug blade 13, the grounding blade receiver 35 can be smoothly inserted. However, when the insulating plate 21 is shortened to a length that does not reach the grounding blade receiver 35, the thickness may be equal to or smaller than the width of the grounding receiving groove 33. When the insulating plate 21 is lengthened, the thickness is set to be equal to or less than the width of the grounding receiving groove 33 at the base, and only the portion inserted into the grounding blade receiver 35 at the tip is thinned to form the grounding blade receiver 35. It should be easy to be inserted.

  In this example, the plug 10 is provided at the distal end of the cord of the lighting fixture 38 and is inserted into the rail outlet 30. By this insertion, as shown in FIG. 2, the power plug blade 12 is received by the power supply blade receiver 34 in the power supply receiving groove 32, and the grounding plug blade 13 is received by the grounding blade receiver 33 in the ground receiving groove 33. 35. At this time, the insulating plate 21 is inserted into the grounding receiving groove 33, and when the insulating plate 21 is long, it is received by the grounding blade receiver 35. In this way, since the insulating plate 21 is inserted into the grounding receiving groove 33 together with the grounding plug blade 13, the insulating plate 21 does not get in the way when the plug 10 is inserted, and the most advanced surface 18 of the plug 10. Until the end surface 37 of the rail socket 30 comes into contact with the rail outlet 30, the tracking effect of the insulating plate 21 can be exhibited while maintaining a safe electrical connection.

  The insulating plate 21 can be formed integrally with the covering portion 17 of the plug body 11 or can be formed integrally with the holding member 14 as shown in FIG. It may be formed separately.

  For example, as shown in FIG. 5, the insulating plate 21 is formed separately from the plug body 11, a mounting portion 22 penetrating in the vertical direction is provided in the plug body 11, and the insulating plate 21 is inserted into the mounting portion 22. May be. At this time, the mounting portion 22 and the insulating plate 21 may be bonded together, but the insulating plate 21 can be made to appear in and out of the plug body 11 by being forcedly fitted with an appropriate elastic resistance of the resin. It can also be left. In this way, by making the protrusion / removal or detachable, the plug 10 can be inserted into the rail outlet 30 by denting or removing the insulating plate 21 from the rail outlet 30 without the grounding receiving groove 33. it can.

  Further, as shown in FIG. 6, a groove-like attachment portion 22 may be provided in the front-rear direction (in FIG. 6, the front-rear direction in the drawing), and the base end 23 of the insulating plate 21 may be inserted to be detachable. At that time, as shown in the figure, it is also desirable that the base end 23 is made larger than the exposed portion of the insulating plate 21 to prevent it from coming off. Further, a weakened portion 24 having a reduced thickness may be provided at the base of the insulating plate 21, and the distal end side of the insulating plate 21 may be foldable from the weakened portion 24.

  Further, as shown in FIGS. 7 and 8, a cap 25 may be detachably attached to the most distal surface 18 of the plug main body 11, and the insulating plate 21 may be protruded from the cap 25. The cap 25 may be provided with an insertion hole 26 into which the power plug blade 12 and / or the grounding plug blade 13 can be inserted, and the cap 25 may be attached to the plug body 11. At this time, the insertion hole 26 may be provided with a short sleeve 27 extending in the distal direction so that the power plug blade 12 penetrates into the sleeve 27 so as to enhance the insulating effect. Further, a protrusion for dust removal may be provided on the peripheral edge portion 28 of the cap 25.

Explanatory drawing of the use condition of the linear outlet and the insertion plug which concerns on embodiment of this invention. Sectional drawing of the connection state of a same-line outlet and an insertion plug. The perspective view of the plug. The perspective view which shows the same internal structure. Explanatory drawing which shows an example of the attachment structure of the insulating board to a plug. Explanatory drawing which shows the other example of the attachment structure of the insulating board to an insertion plug. Explanatory drawing which shows the further another example of the attachment structure of the insulating board to an insertion plug. The perspective view of the plug.

DESCRIPTION OF SYMBOLS 10 Plug 11 Plug main body 12 Power plug blade 13 Grounding plug blade 14 Holding member 15 Power cord 16 Grounding cord 17 Covering part 18 End surface 21 Insulating plate 22 Mounting part 23 Base end 24 Weak part 25 Cap 26 Insertion hole 27 Sleeve 28 Peripheral part 30 Rail outlet 31 Casing 32 Receiving groove for power supply 33 Receiving groove for grounding 34 Receiving blade for power supply 35 Blade receiving blade for grounding 36 Code 37 Tip surface 38 Lighting equipment

Claims (6)

A pair of left and right power receiving grooves provided with a power blade holder inside, and a ground receiving groove provided with a ground blade holder inside, and the grounding between the pair of left and right power receiving grooves. Receiving grooves are formed, and these receiving grooves are three grooves extending in the front-rear direction that open on the front end surface of the outlet casing, and linear outlets that are arranged in parallel with each other;
In the connection structure with the plug for power supply provided with a pair of power plug blades protruding from the tip surface of the plug body,
The plug is provided with an insulating plate protruding from the tip end surface of the plug body,
The insulating plate is located on a line segment connecting the pair of power supply blades,
A structure for connecting a plug to a linear outlet, wherein the insulating plate is received in the grounding receiving groove in a state where the pair of power supply blades are received in the pair of power receiving grooves. The plug is provided with a grounding blade at the front or rear of the insulating plate,
2. The insulating plate and the grounding plug blade are received in the grounding receiving groove in a state where the pair of power supply blades are received in the pair of power receiving grooves. Plug connection structure for the described linear outlet. A power plug having a pair of power blades protruding from the front end surface of the plug body,
A pair of left and right power receiving grooves provided with a power blade holder inside, and a ground receiving groove provided with a ground blade holder inside, and the grounding between the pair of left and right power receiving grooves. Receiving grooves are formed, and these receiving grooves are three grooves extending in the front-rear direction that open on the front end surface of the outlet casing, and can be inserted into linear outlets that are arranged in parallel to each other. In a plug for a straight wire outlet,
Provided with an insulating plate protruding in the tip direction from the tip surface of the plug body,
The insulating plate is located on a line connecting the pair of power supply blades, and is located in the center between the pair of power supply blades in the left-right direction,
The insulating plate is received in the grounding receiving groove in a state where the pair of power supply blades are inserted into the pair of power receiving grooves of the linear outlet. Plug-in plug. The insulating plate is provided integrally with the plug body,
A grounding plug blade is provided in front of or behind the insulating plate,
The insulating plate and the grounding plug blade are received in the grounding receiving groove in a state where the pair of power supply blades are received in the pair of power receiving grooves. The plug for a linear outlet according to claim 3. 4. The plug for a linear outlet according to claim 3, wherein the insulating plate is formed separately from the plug main body, and can be inserted into and removed from the plug main body. The insulating plate is provided integrally with the plug body,
4. The plug plug for a linear outlet according to claim 3, wherein a weakened portion is provided at a base portion of the insulating plate, and a tip end side of the insulating plate can be folded from the weakened portion.

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