JP2004146139A - Plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug capable of preventing insertion blades from dusts or the like and preventing a tracking phenomenon. <P>SOLUTION: Covers 4 covering root parts of insertion blades 2 are arranged to a case 1 equipped with a pair of insertion blades 2. The covers 4 are press opened when the insertion blades 2 are inserted into an insertion port 3a to closely contact with a receptacle 3, and the insertion blades 2 are covered over by the covers 4. The dusts are gathered on the outside of the covers 4, and the pair of insertion blades 2 are prevented from becoming conductive with each other by the dusts. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plug used for home electric appliances and the like.
[0002]
[Prior art]
The power plug runs electricity by plugging the blade into an outlet and operates home appliances. The power plugs of household appliances used every day are often left plugged in. If the power plug is left with insufficient insertion, or if the power plug is loose or left, a gap will be created between the power plug case and the outlet, and dust and debris may form on the blade. Collect around. The dust or dirt causes a tracking phenomenon in which the cutting blades are conducted, which causes a fire.
[0003]
Therefore, in order to prevent the tracking phenomenon, there is a type in which an insulating ring is provided at a root portion of the insert blade. When the insert blade is inserted into the outlet, the ring is in close contact with the outlet to prevent dust and dirt from adhering to the insert blade (for example, see Patent Document 1). In addition, there is one provided with a rubber cover that covers the entire two insert blades (for example, see Patent Document 2).
[0004]
[Patent Document 1] JP-A-08-273742 (paragraphs 0007 to 0009, FIG. 1)
[Patent Document 2] Registered Utility Model No. 3007756 (paragraph 0007, FIG. 1)
[0005]
[Problems to be solved by the invention]
By the way, in Patent Document 1, the ring is sandwiched between the case and the outlet. The depth and shape of the recess around the outlet of the outlet differ depending on the outlet. Therefore, when the recess of the insertion opening is deep, the ring does not adhere to the outlet, and a gap is generated. If the depression is shallow, the ring becomes an obstacle, and the plug cannot be fully inserted into the outlet. In Patent Document 2, the rubber cover may not be able to cover the insert blade depending on the size of the outlet. For example, in the case of the extension table tap, since the pedestal portion is small, a gap is left between the rubber cover and the table tap.
[0006]
In these structures, a path from the outside to the insert blade is formed by the gap, so that dust or dirt entering through this passage collects between the two insert blades, and a tracking phenomenon may occur. There is.
[0007]
Therefore, an object of the present invention is to provide a plug that can prevent a tracking phenomenon by preventing dust, dust, and the like from collecting around the insertion blade.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a case in which a case includes a plurality of pins to be inserted into a connector, and a cover covering at least one of the pins is provided integrally with the case. The cover deforms when the plug is inserted into the insertion opening of the connector and covers the periphery of the insertion opening. The connector is an outlet, a pin jack, or the like, and the pins are rod-shaped or flat-plate-shaped.
[0009]
According to the above configuration, when the pin is inserted into the insertion opening of the connector, the cover is deformed by contacting the connector. Then, the cover comes into close contact with the periphery of the insertion opening, and the space around the insertion opening can be shielded from the external space. Therefore, even if a gap is formed between the case and the connector due to loosening of the plug or the like, the pin is completely hidden from the outside by the cover. Even if dust or dirt enters the gap from the outside, it is blocked by the cover and does not enter the area around the pin. Therefore, there is no possibility that dust, dust and the like are accumulated between the pins to be in a conductive state, and the tracking phenomenon can be prevented.
[0010]
The cover may be provided for each of the plurality of pins, or may be provided for only one of the pins. This is because by covering at least one of the pins with the cover, the adjacent pins can be made non-conductive. Also, the cover can be shaped so as to be deformed so as to be pushed open when it comes into contact with the connector. This allows the cover to cover all of the insertion opening or its surroundings, whatever the shape.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of a plug showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the plug, FIG. 3 is a view showing a state of a cover when the plug is inserted into an outlet, and FIG. FIG.
[0012]
As shown in FIG. 1, the plug in the present embodiment is a power plug, and includes a case 1 and two insert blades 2 as a pair of pins. The pair of insert blades 2 is a metal plate inserted into an insertion port 3a of the outlet 3, and a cord 6 is connected to a rear end thereof. The connection portion between each insert blade 2 and the cord 6 is protected by the case 1, and the pair of insert blades 2 is fixed by the case 1 in a positional relationship corresponding to the insertion opening 3 a.
[0013]
A cover 4 that covers each insert blade 2 is provided integrally with the case 1. The cover 4 is a resin molded product obtained by molding a material having insulation, waterproofness, elasticity, adhesion, and the like, for example, silicone rubber into a sucker shape. The cover 4 covers the root portion of the insert blade 2 and has a shape in which a distal end portion 4a is spread outward. The distal end portion 4a of the cover 4 is set to a length that at least makes contact with the periphery of the insertion port 3a of the outlet 3 when the insert blade 2 is inserted into the insertion port 3a of the outlet 3 and becomes conductive. .
[0014]
A flange 4 b is formed integrally with the rear end of the cover 4, and the insert blade 2 is disposed in the case 1 through the rear end of the cover 4. Since the flange 4b is located inside the case 1, displacement and removal of the cover 4 can be reliably prevented by the anchor effect of the flange 4b.
[0015]
Further, the rear end of the cover 4 and the insert blade 2 are closely attached by utilizing the elasticity of the cover 4. Therefore, dust, dust, and the like do not enter the case 1.
[0016]
When the case 1 is manufactured, an insert molding die is used, and the insert blade 2 and the cord 6 in which the cover 4 is fitted are arranged in the die. At this time, the projecting length of the insert blade 2 from the case 1 is defined by positioning the insert blade 2 with respect to the injection mold. Then, a resin 1 in a molten state, for example, polyvinyl chloride is injected into a mold, and the insert blade 2 and the flange 4b of the cover 4 are integrally insert-molded, whereby the case 1 in which the cover 4 is integrated is manufactured. You.
[0017]
As another example of the case 1, a case 1 having a dividable structure in which an upper case and a lower case are connected by screws can be exemplified. In the case 1 of this embodiment, the insert blade 2 with the cover 4 fitted therein is assembled into the lower case and then overlaid with the upper case, whereby the case 1 with the cover 4 provided integrally can be obtained.
[0018]
Regarding the shape of the cover 4, the distal end portion 4 a is formed into an oval shape so as to surround the root portion of the insert blade 2. Then, when the insert blade 2 is inserted into the insertion opening 3 a of the outlet 3, the distal end portion 4 a of the cover 4 is pushed and spread and comes into close contact with the outlet 3. As shown in FIG. 4, the area where the tip 4a of the cover 4 comes into contact completely covers the insertion opening 3a. When the recess 3b is formed around the insertion opening 3a, the size of the tip 4a of the cover 4 is set so that the recess 3b can be completely covered and concealed. The area 5 covered by one cover 4 does not reach the adjacent insertion opening 3a or the depression 3b around the insertion opening 3a, and does not protrude from the outlet 3. As a result, the adjacent covers 4 interfere with each other, and a gap is formed between the cover 4 and the outlet 3 so that dust and dirt can enter there. Intrusion can be prevented.
[0019]
According to the plug having the above structure, as shown in FIG. 3, when the insert blade 2 is inserted into the insertion slot 3a of the outlet 3, the cover 4 comes into contact with the outlet 3 and is deformed. Can be spread. Further, as the insert blade 2 is inserted, the space surrounded by the cover 4 becomes smaller, and the cover 4 sticks to the outlet 3 like a suction cup. As a result, the cover 4 is not separated from the outlet 3, and the tip 4a of the cover 4 is not turned up, so that dust and dirt do not enter.
[0020]
As described above, the space around the insertion opening 3a can be shielded from the external space by the cover 4, and the contact between the insert blade 2 and the external space can be cut off. Dust, dust, and the like that have entered between the case 1 and the outlet 3 accumulate outside the cover 4. Even if the dust absorbs moisture and the electric resistance value decreases, there is no conduction between the two insert blades 2. Therefore, when the insert blade 2 of the case 1 is used by being inserted into the outlet 3 and a gap is formed between the case 1 and the outlet 3, even if dust or dirt accumulates in the gap, the tracking phenomenon occurs. Can be prevented.
[0021]
In the above-described embodiment, an example in which the present invention is applied to a two-pole plug having a pair of insert blades 2 has been described. However, the present invention is not limited to this, and may be applied to a three-pole plug or any other number of plugs. Applicable. Further, the pin shape can be applied to a plug having a round bar-shaped pin in addition to the flat plate shape. Further, the shape of the cover 4 may be not only a suction cup shape but also a stretchable bellows shape. As the material of the cover, a resin such as an elastomer having electrical insulation and elasticity may be used, and the case may be made of the same material and molded at the same time.
[0022]
【The invention's effect】
As described above, according to the present invention, when a pin such as an insert blade is inserted into an insertion port of a connector such as an outlet, the pin is covered with the cover even if a gap occurs due to loosening between the plug and the connector. Can be hidden. As a result, it is possible to prevent a short circuit, a tracking fire, and the like that occur due to the accumulation of dust or dust between the pins.
[0023]
Further, since the cover is integrated with the case, the cover does not fall off or displace when the plug is used. In addition, since the cover is deformable, it can correspond to any shape of connector. Therefore, stable tracking resistance can be always obtained, and a versatile plug can be realized.
[Brief description of the drawings]
FIG. 1 is a perspective view of a plug according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the plug. FIG. 3 is a view showing a state of a cover when inserted into an outlet. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Insert blade 3 Outlet 3a Insertion opening 3b Recess 4 Cover 4a Tip 4b Flange 5 Covering area 6 Code

Claims (2)

A cover that covers a root portion of at least one pin is provided integrally with a case having a plurality of pins inserted into the insertion port of the connector, and the cover is provided when the pins are inserted into the insertion port of the connector. A plug that covers the insertion slot. The plug according to claim 1, wherein the cover is deformable and expands when it comes into contact with the connector.

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