JP3413408B2 - Protective plug - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective plug, and more particularly to a protective plug for a current overload having practical value.

[0002]

2. Description of the Related Art The prosperity and progress of society greatly improve the quality of life. If you look into everyday items, you will find appliances in every aspect (eg TVs, refrigerators, stoves,
Computer). Therefore, electric appliances are essential tools for daily life. However, with the spread of electric appliances used, accidents due to improper use frequently occur. The number one cause is a fire due to current overload due to improper use. At present, there are automatic electric disconnection plugs on the market, but in addition to economically burdening consumers, they are very inconvenient because they are limited in terms of use, length of wires, quantity, space, etc.

[0003]

In order to solve the above-mentioned drawbacks, the present inventor devised, researched and developed, and finally developed an overload protective plug. The main object of the present invention is to provide an overload protection plug that double blocks the use of electrical appliances.

Another object of the present invention is to provide an overload protective plug which is very simple and reliable to operate. Another object of the present invention is to provide an overloaded protective plug which is economically economical.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the protective plug of the present invention is turned off when the electric current used is overloaded, the positive electrode terminal and the contact thin piece of electric conduction are automatically repelled by heat. become. At that time, since the slide blocking thin piece is pushed by the spring and moves outward, it completely blocks the positive electrode terminal and the contact thin piece of electric conduction, and achieves the protective purpose of double blocking the use of the electric appliance. .

Further, after being cut off, when the user uses it again, by simply pushing the slide blocking thin piece inward, the positive electrode terminal and the electrically conductive contact thin piece come into contact with each other again and become conductive, so the operation method is very simple. And certain.
Moreover, the plug is simple and straightforward, and you don't have to spend money to buy it.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, refer to FIG. 1, FIG. 2 and FIG. The protective plug according to the embodiment of the present invention mainly includes an inner mold 10, a positive electrode terminal 20, a negative electrode terminal 30, a slide blocking thin piece 40, and an electrically conductive contact thin piece 5.
0, spring 45, cover 60 and other elements.

The inner mold 10 is made of an insulating material. Since the upper end thereof has a hollow pedestal 11 having an opening, a housing space 12 is formed in the center. The pedestal 1
An upper insertion groove 13 and a lower insertion groove 14 which are parallel to each other in the vertical direction are provided on the front surface of 1. Inside the upper insertion groove 13 and the lower insertion groove 14, the L-shaped upper partition 15 and the lower partition 16 facing each other are vertically extended, so that a position movement space 17 is provided between the upper partition 15 and the lower partition 16. Besides being formed, a notch 18 is also formed at one end of the pedestal 11.

The positive electrode terminal 20 is made of an electrically conductive material and has an insertion pin 21 and a locking portion 22. Since the insertion pin 21 is inserted into the upper insertion groove 13 and arranged outside,
The insertion pin 21 is exposed to the outside, and the locking portion 22 is vertically fitted into the upper partition 15. A contact 23 for electrical conduction projects inside thereof.

The negative electrode terminal 30 is made of an electrically conductive material, and has an insertion pin 31, a locking portion 32 and a connector 33.
Have. Since the insertion pin 31 is inserted into the lower insertion groove 14 and arranged outside, the insertion pin 31 is exposed to the outside and the locking portion 32 is vertically fitted into the lower partition 16. The connector 33 is connected to the wire 70.

The slide barrier thin piece 40 is made of an insulating material,
It is fitted between the position movement space 17 and the accommodation space 12. A through hole 41 is provided on the surface near the electrical contact 23. Furthermore, the pushing portion 42 is provided at one end.
And is housed and placed in the notch 18. The positioning side 43 projects to one side, and the positioning side 43 has a positioning cock 44.

[0012] The electrically conductive contact strip 50 is formed by merging and connecting two metals having different malleability coefficients. An electrically conductive contact 51 is provided inside the electrically conductive contact piece 50. When it is housed and arranged in the through hole 41, the positive electrode terminal 2
It contacts a contact 23 of 0 electrical continuity. A connector 52 for connecting to the wire 70 is provided at one end of the electrically conductive contact thin piece 50.

Since the spring 45 is fitted to the positioning cock 44, the position moving space 17 is used as a fixed end.
It provides an action force that pushes the slide barrier thin piece 40 and moves it outward. The cover 60 is fitted on the inner mold 10. Then, as shown in FIG.
When the insulating plastic coating 80 is injected to manufacture the plug, the insulating plastic does not enter the receiving space 12. However, in the process of injection, the inner mold 1
It must be injected in line with the notch 18 of 0 so that the notch 18 communicates with the outside world.

As shown in FIG. 4, when the working current is overloaded, the electrically conductive contact thin piece 50 exceeds the predetermined temperature, and the electrically conductive contact thin piece 50 moves backward due to the temperature malleability of different metals. Can be bent. The electrically conductive contact 51 is the electrically conductive contact 23 of the positive electrode terminal 20.
It goes off because it leaves. At that time, the slide blocking thin piece 40 is not braked by the contact 51 of electric conduction. As shown in FIG. 5, since the slide blocking thin piece 40 is pushed outward by the spring 45, the insulating slide blocking thin piece 40 completely blocks the contact between the two electrically conductive contacts 23 and 51.

Over time with the plug off, the temperature of the electrically conductive contact strip 50 drops and returns to the body position.
When the user uses it again, the pushing part 42
Press in. So the two electrically conductive contacts 23, 51
Enter along the through hole 41 and merge, so that the original use state is restored as shown in FIG.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a state in which a cover of a protective plug according to an exemplary embodiment of the present invention is removed.

FIG. 2 is an exploded perspective view showing a protection plug according to an exemplary embodiment of the present invention.

FIG. 3 is a sectional view showing a state of a protective plug according to an embodiment of the present invention at room temperature.

FIG. 4 is a cross-sectional view showing a bent state of an electrically conductive contact thin piece of a protective plug according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state in which a slide blocking thin piece of a protection plug according to an exemplary embodiment of the present invention has moved.

FIG. 6 is a cross-sectional view showing a state in which a slide blocking thin piece of a protection plug according to an embodiment of the present invention is pushed.

FIG. 7 is a top view showing a state in which an insulating coating is injected into an inner mold of a protective plug according to an embodiment of the present invention to form the plug.

[Explanation of symbols]

10 Inner mold 12 accommodation space 13 Upper insertion groove 14 Lower insertion groove 15 Upper partition 16 Subdivision 17 Position movement space 18 notches 20 positive electrode terminal 21 Insertion pin 22 Locking part 23 Electrically conductive contacts 30 Negative electrode terminal 31 Insertion pin 32 Locking part 40 Slide barrier slice 41 through hole 43 Positioning side 44 Positioning cock 45 spring 50 Electrically conductive contact flakes 51 Electrical continuity contact 60 cover

Claims (11)

(57) [Claims] 1. An inner mold, a positive electrode terminal, a negative electrode terminal, a contact thin piece for electrical conduction, a slide stop thin piece, and a cover, wherein the inner mold has an opening and is provided in a central portion. Has an accommodating space, an upper insertion groove and a lower insertion groove are provided in parallel to the tip, the positive electrode terminal is installed in the upper insertion groove, has an insertion pin at the tip, and has an L-shaped end at the rear end. A locking portion, which is positioned on the inner mold by the locking portion, the negative electrode terminal is installed in the lower insertion groove, has an insertion pin at the tip, and has an L-shaped locking portion at the rear end. Is positioned in the inner mold by the locking portion, the contact thin piece of electrical conduction is bent by heat, one end is fitted into the accommodation space in parallel, and the other end is suspended in the air. , The slide block The thin piece is provided parallel to the accommodation space between the electrically conductive contact thin piece and the positive electrode terminal, and is movably installed, and the cover is provided above the inner mold. Protective plug to do. 2. The protective plug according to claim 1, wherein the inner mold is made of an insulating material . 3. An L-shaped upper partition and a lower partition facing each other are provided inside the upper insertion groove and the lower insertion groove, and engaging portions of the positive electrode terminal and the negative electrode terminal are fitted therein. The protective plug according to claim 1, wherein: 4. The protective plug according to claim 3, wherein a concave position movement space is formed between the upper partition and the lower partition. 5. A notch is provided on one side of the inner mold, and an outer end of the slide blocking thin piece communicates with the outside through the notch.
Protective plug as described. 6. The protective plug according to claim 1, wherein a contact point for electrical conduction is provided at a locking portion of the positive electrode terminal. 7. The protective plug according to claim 1, wherein a through hole is provided at one end of the slide blocking thin piece. 8. The positioning edge projects vertically from one side of the slide blocking thin piece, and the positioning edge is disposed in a position movement space to limit the movement of the slide blocking thin piece. Protective plug. 9. A positioning cock is provided downward from the positioning side, and a spring is fitted to the positioning cock to push the positioning cock under the position movement space to move the slide blocking thin piece outward. 9. The protective plug according to claim 8, which provides a force. 10. The protective plug according to claim 1, wherein the electrically conductive contact thin piece is formed by merging and connecting double metals having different malleability coefficients. 11. An electrically conductive contact is provided at an end of the electrically conductive contact thin piece, the electrically conductive contact is locked in a through hole at room temperature, and is in mutual contact with the electrically conductive contact of the positive electrode terminal. The protective plug according to claim 1, wherein: