JPH08124622A - Attachment plug - Google Patents

Abstract

PURPOSE: To provide an attachment plug wherein dust or moisture does not easily enter between plug blades, and poor insulation can be prevented when the plug blades are inserted into a plug socket, by providing a plug main body wherein a pair of plug blades project from the front surface and the specified insulating projecting parts. CONSTITUTION: An attachment plug is provided with a plug main body 1 wherein a pair of plug blades 3 project from the front surface, and an insulating projecting parts 2 so provided as to surround roots of the plug blades 3. Preferably, the insulating projecting parts 2 are integrally formed on the plug main body. Each insulating projecting part is provided with a center hole part 2a in the center part, having the shape to be fitted into a drawing guide recessed part of the plug blade formed on the opening edge of an insertion hole of a plug socket, and it is desirable that the sectional outer shape is formed into an approximately triangular shape in section by increasing the wall thickness so that one end side of the center hole part 2a may be fitted into the drawing guide recessed part, and gradually decreasing the wall thickness from one end side so that the other end side may be advanced into the insertion hole.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a plug.

[0002]

2. Description of the Related Art An insertion plug is used by inserting it into an outlet, but it is often used while being inserted into the outlet for a long period of time in a humid place such as a kitchen.

[0003]

However, in a humid place, when the plug body is not sufficiently inserted into the outlet surface and the plug body is in a state of being floated from the outlet surface, dust is left between the blades. Penetrates and absorbs moisture, causing insulation failure between the blades and causing leakage current. As a result, the space between the blades is carbonized and short-circuit discharge occurs, causing troubles such as burning. On the other hand, if the moisture between the blades is evaporated by short-circuit discharge, the insulation failure between the blades may be recovered, but if the dust between the blades absorbs moisture again, the same phenomenon as above will occur repeatedly, causing the trouble. Is inevitable.

Therefore, an object of the present invention is to provide a plug-in plug which can prevent insulation failure between blades.

[0005]

A plug plug according to claim 1 is provided with a plug body having a pair of blades protruding from the surface, and an insulating protrusion provided so as to surround the root of the blades. Is. A plug plug according to a second aspect of the present invention is the plug plug according to the first aspect, wherein the insulating protrusion is integrally formed with the plug body.

A plug plug according to a third aspect of the present invention is the plug plug according to the first aspect, which has a fixing portion for removably positioning and fixing the insulating protrusion in the plug body.

[0007]

According to the insert plug of the first aspect, since the insulating protrusion surrounds the root of the blade, dust and moisture are less likely to enter, and the creeping distance between the roots of the blade can be increased. Therefore, even if the dust collected between the blades absorbs moisture, insulation failure can be prevented as compared with the conventional example.

According to the plug-in plug of claim 2, in claim 1, since the insulating protrusion is formed integrally with the plug body, the same effect as in claim 1 is obtained, and the insulating protrusion is provided in the plug body. Compared with the case where it is provided separately, the work of assembling is unnecessary. According to the plug-in plug of claim 3, in the first aspect, since the insulating protrusion has a fixing portion that is removably positioned and fixed in the plug body, the insulating protrusion has the same function as that of the first aspect. Assembling is easy because the plug can be inserted into the plug body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, this plug-in has the plug body 1 and the insulating protrusion 2. The plug body 1 is
A pair of blades 3 are projected from the surface. The plug body 1 of the embodiment is a combination of a vinyl-integrated molded product in which the blade 3 is molded at the same time, or a combination of a half of a pair of molded products.
The one that contains the is used. Reference numeral 4 is a cord, and 5 is a cord insertion hole.

The insulating protrusion 2 is provided so as to surround the root of the blade 3. The insulator 2 of the embodiment is an insulating adapter using a soft rubber molded product, a polyethylene molded product, a polypropylene molded product, or the like, and has a central hole 2a at the center as shown in the figure. The outer shape of the insulating protrusion 2 is such that it fits into the pull-in guide recess 9 of the plug blade 3 formed at the opening edge of the insertion hole 7 of the outlet, and one end of the central hole 2a has a pull-in guide recess. 9 has a large wall thickness so that the other end can be inserted into the insertion hole 7, and the wall thickness is gradually reduced from one end so that the cross-section has a substantially triangular cross-section. . At this time, the front end side of the blade 3 is formed to have a thickness of, for example, about 0.1 mm to 0.3 mm so as not to hinder insertion and removal of the insertion plug. Then, the central hole 2a of the insulating protrusion 2 is passed through the stopper blade 3 in a close contact state and positioned at the root of the stopper blade 3.

FIG. 3 shows a connection to an outlet, where 7 is an insertion hole, 8 is a receiving blade of the blade 3, and 12 is a main body of the outlet. 3A shows a state before the plug blade 3 of the insertion plug is inserted into the insertion hole 7, and FIG. 3B shows a state where the plug blade 3 of the insertion plug is inserted into the insertion hole 7. The insulating protrusion 2 is fitted in the pull-in guide recess 9 of the insertion hole 7, and the tip is located in the insertion hole 7.

According to this embodiment, since the insulating protrusion 2 surrounds the root of the blade 3, it is difficult for dust and moisture to enter, and the creeping distance between the roots of the blade 3 can be increased. Therefore, even if dust collected between the blades 3 absorbs moisture, defective insulation can be prevented as compared with the conventional example. Therefore, the effect of preventing burnout can be increased, which is particularly useful for a plug that is used while being inserted into an outlet for a long time, and the effect is large regardless of the shape of the outlet. Since the insulating protrusion 2 is separate from the plug body 1, this embodiment can be applied to the conventional plug body 1.

A second embodiment of the present invention is shown in FIGS.
Shown in That is, in this plug-in, the insulating protrusion 2 is formed integrally with the plug body 1 in the first embodiment. The plug body 1 of the embodiment has a pair of halves 14a, 1
4b, and the insulating protrusion 2 is simultaneously formed on the plug body 1 using rubber. Reference numeral 1a is a blade projection groove for forming a blade projection hole for projecting a blade, 13 is a wire connecting screw of the blade 3, 15 is a connecting wire passage, 16 is a connecting hole, and a nut is provided on the surface side of the half body 14a (Fig. (Not shown) is buried. Reference numeral 17 denotes a screw which is threaded into the nut and is passed through the connecting hole of the other half body 14b. Further, the central groove portion 2b of the insulating protruding portion 2 communicates with the blade protruding portion 1a. Other configurations are the same as those of the first embodiment.

According to this embodiment, since the insulating protrusion 2 is formed integrally with the plug body 1, as compared with the case where the insulating protrusion 2 is separately provided in the plug body 1, the work of assembling is unnecessary. Besides, there are the same effects as those of the first embodiment. A third embodiment of the present invention is shown in FIGS.
That is, this plug-in has the fixing portion 19 in which the insulating protrusion 2 is removably positioned and fixed in the plug body 1. The insulating protrusion 2 of the embodiment is made of synthetic resin like the plug body 1. The plug body 1 has the same structure as that of the second embodiment, but each half 1
An insulating protrusion housing portion 18 for housing and fixing is formed by inserting a fixing portion 19 at the front end portions of 4a and 14b.
Further, the plug blade projecting groove 1a is formed larger than the cross-sectional shape of the plug blade 3, the insulating projecting portion 2 is fitted therein, and the blade 3 penetrates the central groove portion 2b of the insulating projecting portion 2. The other structure is similar to that of the second embodiment.

According to this embodiment, the insulating protrusion 2 may be inserted into the plug body 1 to facilitate the assembling.
There are similar effects to those of the first embodiment. The insulating protrusion 2 may be formed by forming a ring-shaped groove in the plug body 1 of the root.

[0016]

According to the insertion flag of the first aspect of the present invention, since the insulating protrusion surrounds the root of the blade, it is difficult for dust and moisture to enter and the creepage distance between the roots of the blade is increased. Therefore, even if dust collected between the blades absorbs moisture, there is an effect that defective insulation can be prevented as compared with the conventional example.

According to the plug-in plug of claim 2, in claim 1, since the insulating protrusion is formed integrally with the plug body, the same effect as in claim 1 is obtained, and the insulating protrusion is formed in the plug body. Compared with the case where it is provided separately, the work of assembling is unnecessary. According to the plug-in plug of claim 3, since the insulating protrusion has a fixing part that is removably positioned and fixed in the plug body in the first aspect, the insulating protrusion has the same effect as that of the first aspect. Assembling is easy because the plug can be inserted into the plug body.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view thereof.

FIG. 3 is an explanatory diagram illustrating insertion into an outlet.

FIG. 4 is a front view of one half of the plug body of the second embodiment.

FIG. 5 is a front view of the other half body.

FIG. 6 is a front view of one half of a plug body according to a third embodiment.

FIG. 7 is a front view of the other half body.

[Explanation of symbols]

 1 Plug body 2 Insulation protrusion 3 Plug blade

Claims (3)

[Claims] 1. A plug plug comprising a plug body having a pair of blades protruding from the surface, and an insulating protrusion provided so as to surround a root of the blades. 2. The plug according to claim 1, wherein the insulating protrusion is formed integrally with the plug body. 3. The plug according to claim 1, wherein the insulating protrusion has a fixing portion that is removably positioned and fixed in the plug body.