JPH09185971A - Plug with tracking preventing means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug with tracking preventing means capable of completely preventing tracking. SOLUTION: A plug with tracking preventing means comprises a plug main body 1 and contact blades 2, dustproof thin parts 9 are formed in the outer circumference of the contact blades 2 of the plug main body 1, a groove is formed at the root on the inner surface of the dustproof thin part 9, and in addition, the dustproof thin part 9 is formed in the shape of tulip. Thereby, even if a gap exists between the plug and a receptacle, dust is not accumulated between them, and tracking is completely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug having a function of preventing tracking.

[0002]

2. Description of the Related Art A plug, which is used as a connector attached to the tip of a cord for connecting equipment to equipment, equipment to power supply, cord to door, etc., is utilized in various places of life, There are various types. The most common one is a plug as shown in FIGS. 3 (A) and 3 (B).

The plug shown in FIG. 3 (A) has an outer shape composed of a plug body 1 and a contact blade 2, and a cord 3 is pulled out. Figure 4 shows the plug connected to an outlet.
Shown in The outlet 4 is attached to the flash plate 6, and the flash plate 6 is further attached to the wall 5 with screws or the like.

When the contact blade of the plug 1 is inserted into the outlet 4 in order to connect the equipment and the power source, the surface of the flash plate 6 and the plug 1 are not in close contact with each other, and some gaps are often formed. There is. If such a state is for a relatively short time such that the plug 1 and the outlet 4 are turned on and off again, there is no problem as much as left, but the contact blade of the plug 1 is left inserted in the outlet 4. For example, there is a possibility that tracking may occur when used for a long time.

In tracking, if there is a gap between the plug and the outlet, dust will accumulate for a long time, and if this dust becomes damp, current will flow between the contact blades even if there is no load, and this dust will resist. It is that the body heats up, the plug is carbonized and ignites, which is extremely dangerous and unacceptable as an electric appliance. Therefore, in order to prevent such tracking, FIG.
There was something like that shown.

The plug shown in FIG. 3 (B) has a tracking prevention groove provided inside both contact blades of the plug shown in FIG. 3 (A), and the groove prevents current from flowing between the contact blades. It is what However, this was not enough to prevent tracking.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention provides a tracking-preventing plug capable of completely preventing tracking from the above-mentioned problems in the prior art.

[0008]

The plug with tracking prevention according to claim 1 of the present invention is achieved by forming a dustproof thin portion on the outer periphery of the plug body on the contact blade side.

In the plug with tracking prevention according to the second aspect of the present invention, the dustproof thin portion is formed on the outer periphery of the contact body side of the plug body, and the groove is provided at the base of the inner surface of the dustproof thin portion. To be achieved.

In the plug with tracking prevention according to claim 3 of the present invention, the dustproof thin portion is formed on the outer periphery of the contact body side of the plug body, and the dustproof thin portion has a tulip shape, or This is achieved by forming a dustproof thin portion on the outer periphery of the contact body side of the plug body, providing a groove at the base of the inner surface of the dustproof thin portion, and further forming the shape of the dustproof thin portion into a tulip shape.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tracking prevention plug according to the present invention will be described with reference to FIG. As shown in FIG. 1, the tracking prevention plug of the present invention has the same outer shape as the conventional plug up to the point where the cord 3 is pulled out, which is composed of the plug main body 1 and the contact blade 2, and further the plug. This is a new configuration different from the conventional plug in that the dustproof thin portion 9 is formed on the outer periphery of the main body 1 on the contact blade 2 side.

Since the dustproof thin portion 9 is thinly formed, it deforms with some elasticity when a force is applied, and a vertical pressing force is applied to the outer peripheral edge portion of the dustproof thin portion 9. 9 exhibits a state of spreading outward. 2A and 2B show a state in which the tracking prevention plug is connected to an outlet.

The outlet 4 is attached to the flash plate 6, and the flash plate 6 is further attached to the wall 5 with screws or the like. When the contact blade of the plug is inserted into the outlet 4 in order to connect the device to the power source, the surface of the flash plate 6 and the dustproof thin portion 9 formed extending to the outer periphery of the plug body 1 come into close contact with each other.

FIG. 2A shows a plug 1 body and an outlet 4.
Although there is a gap between them, the dustproof thin portion 9 acts as a shielding wall against dust, and even if there is a gap between the plug body 1 and the outlet 4, dust accumulates between them. Tracking can be prevented because it is not performed.

Further, by forming the dustproof thin portion 9 on the outer periphery of the contact body 2 side of the plug body 1 and providing the groove 10 at the root of the inner surface of the dustproof thin portion 9, the dustproof thin portion 9 is provided when the plug is inserted. It is possible to reduce the resistance of the thin portion 9 and to secure further adhesion. As a result, tracking can be prevented.

Further, in addition to the above construction, the dustproof thin portion 9
When the plug is inserted in a tulip shape, the dustproof thin portion 9 is likely to open outward when the plug is inserted, and reliable adhesion can be obtained. As a result, tracking can be prevented.

FIG. 2B shows the plug body 1 and the outlet 4.
Is in a completely adhered state, and the shape of the dustproof thin portion 9 is formed in a tulip shape, or the shape of the groove 10 and the dustproof thin portion 9 is tulip-shaped at the root of the inner surface of the dustproof thin portion 9. Can be achieved when formed. Therefore, there is no room for tracking to occur.

Although the above embodiment has been described by taking the plug as an example, it is obvious that the present invention is not limited to this and can be applied to other types of plugs.

[0019]

As described above, according to the tracking prevention plug of the present invention, the dustproof thin portion is formed on the outer periphery of the plug body on the side of the contact blade, so that the dustproof thin portion forms a shielding wall against dust. Such a role is fulfilled, and even if there is a gap between the plug and the outlet, dust is not accumulated between them, so that tracking can be completely prevented and the device can be provided as a safe electric appliance.

[Brief description of the drawings]

FIG. 1 is a plug with tracking prevention according to the present invention.

FIG. 2 is a first and second connection state diagram of the plug and the cent of the present invention.

FIG. 3 shows two conventional plugs.

FIG. 4 is a connection state diagram of a conventional plug and coin.

[Explanation of symbols]

 1 ... Plug body 2 ... Contact blade 3 ... Cord 4 ... Outlet 5 ... Wall 6 ... Flash plate 7 ... Gap 8 ... Tracking prevention groove 9 ... Dustproof Thin-walled part for groove 10 ...

Claims (3)

[Claims] 1. A plug with tracking prevention, characterized in that a dustproof thin portion is formed on the outer periphery of the contact body side of the plug body. 2. The tracking prevention plug according to claim 1, wherein a groove is provided at the base of the inner surface of the dustproof thin portion. 3. The tracking prevention plug according to claim 1 or 2, wherein the dustproof thin portion has a tulip shape.