JP2001035599A - Plug socket for inserting power source plug with ground terminal pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent he occurrence of a tracking phenomenon, even in the long-time inserted state by burying a conductive plate in an insulating casing so as to interrupt a pair of terminal blade fitting electrodes, make to protrude the end part on the side opposite to a power source plug from the end surface of the insulating casing, and connecting it to a pin fitting electrode. SOLUTION: A conductive plate 2 is embedded in a plug socket insulating casing 1 so as to interrupt the terminal blade fitting electrodes L1, L2 of an electronic plug. The end surface, opposite to a power source plug of the conductive plate 2, is protruded from the end surface 11 which is opposite to the power source plug of the insulating casing 1, and connected to a ground terminal pin fitting electrode E of the power source plug for inserting the ground terminal pin 5 of the power source plug. When dust 7 accumulates in the clearance between the opposed surfaces 11 of the power source plug and the plug socket and becomes wetted into the state where leakage current I is carried to terminal blades 4A, 4B of the power source plug, the leakage current I can be carried to the electrode E through the protruding end of the conductive plate 2 and then grounded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electrical equipment and office automation equipment.
The present invention relates to an outlet for inserting a power plug at the end of a cord connected to a device or the like.

[0002]

2. Description of the Related Art As the power plug for supplying electric power to electric equipment, OA equipment, and the like, a power plug with a ground terminal pin for grounding a leakage current generated on the electric equipment, OA equipment, and the like is known. I have. As shown in FIG. 4 and FIG. 5, an outlet for inserting such a power plug is a pair of terminal blades provided to face each other at a predetermined interval for inserting the pair of terminal blades 4A and 4B of the power plug 3. Double-terminal blade fitting electrodes L1, L2 for inserting the fitting electrodes L1, L2 and the ground terminal pin 5 of the power plug 3.
2 shows a configuration in which the ground terminal pin insertion electrode E disposed at a lateral position deviated from the opposing surface portion is held in the insulating housing 1. In a normal state where the power plug 3 is inserted, the terminal When electric power is supplied to the electric equipment and the OA equipment through the terminal blades 4A and 4B and the cord inserted into the blade-inserting electrodes L1 and L2 to operate them, and when a leakage current occurs on the electric or OA equipment side, This leakage current flows to the earth side through the earth terminal pin insertion electrode E into which the earth terminal pin 5 is inserted, and the operation of the earth leakage breaker (generally operating at 30 mA) causes an electric shock on the used electric equipment or the OA equipment. The power will be shut down before the accident occurs.

[0003]

However, in the outlet shown in FIGS. 4 and 5 in which the power plug 3 is inserted,
This insertion state continues for a long period of time, and dust 7 accumulates in the gap 6 between the power plug 3 and the facing surface of the outlet. When the dust 7 is moist, both terminal blades 4A, 4B of the power plug 3 The leakage current I flows through the end face 11 of the insulating housing 1 therebetween. The repetitive conduction of the leakage current I causes arc flashing, and eventually causes a tracking phenomenon in which the insulating casing 1 of the outlet and the insulating plug body 8 of the power plug 3 are heated and burned, thereby causing a fire accident. Fear.

The present invention has been made in view of the above points, and provides a novel power plug plug-in outlet with a ground terminal pin, which does not cause a tracking phenomenon even when the power plug is left in a plug-in state for a long period of time. It is intended to do so.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there are provided a pair of power supply plugs which are opposed to each other at a predetermined interval, and a pair of terminal blade insertion electrodes. A pair of terminal blades disposed opposite to each other, wherein the pair of terminal blades are disposed in an insulating housing in which an electrode for fitting a ground terminal pin of a power plug disposed at a side position deviated from a facing surface portion of the power electrode is held in an insulating housing. A conductive plate is embedded in the insulating housing so as to block between the fitting electrodes, and an end of the conductive plate facing the power plug is protruded from an end face of the insulating housing facing the power plug, and the conductive plate is Was connected to an electrode for fitting a ground terminal pin to form an outlet for inserting a power plug with a ground terminal pin.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an outlet for inserting a power plug with a ground terminal pin according to the present invention. 1 and 2 show an embodiment of the present invention in which a power plug with a ground terminal pin is inserted. A pair of terminal blades 4A and 4B of a power plug 3 are provided in an insulating housing 1. And a pair of terminal blade fitting electrodes L1 and L2 for inserting the grounding terminal pins 5 of the power plug 3 and a pair of terminal blade fitting electrodes L1 and L2 disposed opposite to each other at a predetermined interval. An electrode E for fitting a ground terminal pin, which is disposed at a lateral position off the surface, is held. A conductive plate 2 made of, for example, metal, conductive rubber, plastic, or the like is buried in the insulating housing 1 so as to block between the pair of terminal blade insertion electrodes L1 and L2 disposed opposite to each other. I have. The end 2 of the conductive plate 2 on the side facing the power plug 3
1 protrudes from an end surface 11 of the insulating housing 1 facing the power plug 3 so as to fill a gap 6 between the power plug 3 and the facing surface of the outlet, and the conductive plate 2 is connected to the ground terminal pin insertion electrode E. Are electrically connected to each other, thus forming an outlet for inserting a power plug with a ground terminal pin according to the present invention.

In the above configuration, dust 7 accumulates in the gap 6 between the facing surface of the power plug 3 and the outlet, and the dust 7 becomes moist and a leakage current I flows between the terminal blades 4A and 4B. In this case, the leakage current I flows into the ground terminal pin insertion electrode E through the protruding end 21 of the conductive plate 2 and is discharged to the ground side. In general, when the leakage current I reaches 30 mA, the leakage breaker operates to cut off the power. Therefore, unlike the related art, no leakage current flows between the two terminal blades 4A and 4B of the power plug 3 and an arc flash does not occur.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a conductive plate 2 is provided so as to surround one of the terminal blade fitting electrodes (electrode L2 in the figure). However, since one side of the rectangular conductive plate 2 blocks between the pair of terminal blade fitting electrodes L1 and L2, the above-described measures regarding the leakage current I are performed in the embodiment shown in FIG. This is the same as in the case, and it is possible to effectively prevent the occurrence of arc flashover between the terminal blades 4A and 4B.

[0009]

According to the present invention, the leakage current I, which tends to flow between the two terminal blades 4A and 4B caused by dust 7 accumulated in the gap 6 between the power plug 3 and the facing surface of the outlet, is generated. Is captured by the conductive plate 2 provided so as to block between the pair of terminal blade fitting electrodes L1 and L2, flows to the ground terminal pin fitting electrode E, and is discharged to the ground side (to be a ground fault current). )be able to. When the leakage current I is large, the power is cut off by the operation of the leakage breaker. Therefore, both terminal blades 4A, 4B of power plug 3
Leakage current causing an arc flash does not flow between them, and it is possible to prevent heat and flame from burning due to the tracking phenomenon of the insulating housing 1 of the outlet and the insulating plug body 8 of the power plug 3.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view showing an embodiment of an outlet for inserting a power plug with a ground terminal pin according to the present invention, in which a power plug with a ground terminal pin is inserted.

FIG. 2 is a front view taken along the line II in FIG.

FIG. 3 is a front view corresponding to FIG. 2, showing another embodiment of an outlet for inserting a power plug with a ground terminal pin according to the present invention.

FIG. 4 is a schematic longitudinal sectional side view showing a conventional outlet for inserting a power plug with a ground terminal pin, in which a power plug with a ground terminal pin is inserted.

FIG. 5 is a front view taken along a roll line in FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Insulated housing 11 End face of insulating housing facing power plug 2 Conductive plate 21 End of conductive plate facing power plug 3 Power plug 4A, 4B Terminal blade of power plug 5 Ground terminal pin of power plug 6 Power plug 7 Dust 8 Insulating plug body L1, L2 Electrode for fitting terminal blade of power plug E Electrode for fitting ground terminal pin of power plug I Leakage current

Claims (1)

[Claims] 1. A terminal blade fitting electrode (L1), (L2) of a pair of power plugs disposed opposite to each other at a predetermined interval.
And an electrode (E) for inserting a ground terminal pin of a power plug disposed at a lateral position deviating from a facing surface of the electrode (L1), (L2) for both terminal blades. )
A conductive plate (2) is buried in the insulating housing (1) so as to block between the pair of terminal blade insertion electrodes (L1) and (L2) disposed opposite to each other. At the same time, the end (21) of the conductive plate (2) facing the power plug protrudes from the end surface (11) of the insulating housing (1) facing the power plug, and the conductive plate (2) is grounded. An outlet for inserting a power plug with a ground terminal pin, the outlet being connected to the terminal pin insertion electrode (E).