JP3066284B2 - plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the prevention of overheating of plugs used for electric equipment in ordinary households.

[0002]

2. Description of the Related Art A conventional plug used as a plug is constructed as shown in FIG. 9. In FIG. 9, 1 is a plug case made of a vinyl chloride resin, 2 and 2 are insulators such as vinyl chloride, 3, 3 is a copper wire conductor covered with the insulator 2, and 4, 4 is a phosphor bronze conductive blade.
The plug is formed by joining one end of a conductor 3 not covered with the insulator 2 with one end of a conductive blade 4 and then integrally molding the same with vinyl chloride to form a plug case 1. It is widely used because it is easy and inexpensive to manufacture.

[0003] The above-mentioned plug is connected to an electric appliance so as to be able to conduct electricity. When an electric appliance is used, the conductive blade of the plug is inserted into an outlet, and connected to a receiving blade inside the outlet to conduct electricity. The circuit of the electric product is used as ON.

[0005] In FIG. 15, an insertion plug connected to an electric hot-air heater is connected to a power strip having a rating of 125 V and 10 A, and a plug for a force required for pulling out the insertion plug from the power strip when a current of 12 A flows. 3 shows a relationship between connection part temperatures. Various points (〇, ●, Δ, ▲) in FIG. 15 indicate variations of the same kind of plugs depending on the product.

FIG. 16 shows the relationship between the contact resistance and the plug connection temperature under the same conditions as FIG. 15, and the contact resistance is proportional to the plug connection temperature. The contact resistance was calculated from the voltage and the current at the connection. That is, when the pull-out force decreases and the contact resistance increases, the temperature of the plug connection portion exceeds 100 ° C., and the inner surface of the resin of the outlet or the plug becomes higher than the thermal deformation temperature of the resin.

[0006]

With the plug constructed as described above, the contact between the conductive blade and the receptacle of the outlet when connected to a cooker or an electric hot air heater through which a large current flows is used. When insufficient, a large current flows through a very small contact portion, and the contact portion is locally heated by Joule heat, which causes a problem that the plug case resin is deformed or discolored. The present invention, when the conductive portion generates heat, cuts off the current supply, returns to a state where current can be supplied by a simple process, and
The purpose is to provide an inexpensive plug.

[0007]

According to a first aspect of the present invention, there is provided a plug, comprising: a first conductor; a second conductor; and a first conductor. A plug including a body and a case in which the second conductor is provided; and a space in which the first conductor and the second conductor are exposed and sealed inside the case, A fusible body for electrically connecting the first conductor and the second conductor at a connection portion of the space, wherein the fusible body is heated when heated to a predetermined temperature; It flows from the connection portion to the bottom of the space to blow off the electrical connection between the first conductor and the second conductor, and further, the fusible material positions the bottom above the connection portion. The fusible body is heated to the predetermined temperature and flows from the bottom to the connection portion to re-establish the electrical connection between the first conductor and the second conductor. One in which you composed.

[0008] The invention described in claim 2 is the first invention.
Providing a heated portion for heating the fusible body to the predetermined temperature in order to regenerate an electrical connection between the conductor and the second conductor, wherein the heated portion includes the first conductor and Or second
Has one end connected to the conductor and the other end exposed to the outer surface of the case.

According to a third aspect of the present invention, in order to regenerate an electrical connection between the first conductor and the second conductor, the first conductor and / or the second conductor may be used. And one end of the conductor is exposed to the outside of the case.

Further, according to a fourth aspect of the present invention, an inner surface of the space from the connection portion to the bottom portion is formed as an inclined surface.

[0011]

According to the first aspect of the present invention, when the first conductor or the second conductor is heated to a predetermined temperature, the plug is connected when the fusible body is heated to the predetermined temperature. The current flows from the portion to the bottom to blow off the first conductor and the second conductor, thereby stopping the current supply. Further, the bottom portion is located above the connection portion, and the fusible material accumulated at the bottom portion is heated to a predetermined temperature, so that the fusible material flows from the bottom portion to the connection portion, and the first conductor and the second conductor are connected to each other. Regenerate the electrical connection between

Further, according to the present invention, by heating one end of the heated portion exposed from the case, the fusible material accumulated at the bottom of the space is dissolved, and the first conductor and the second conductor are melted.
Is again connected to the conductor with a soluble material.

According to a third aspect of the present invention, the first conductor and / or the second conductor is heated at one end exposed to the outside of the case, thereby dissolving the fusible material accumulated at the bottom, thereby dissolving the first conductor and / or the second conductor. The first conductor and the second conductor are connected again with a soluble body.

Further, according to the invention described in claim 4, the fusible material heated to a predetermined temperature smoothly flows on the inclined surface from the connection portion of the space to the bottom.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the plug of the present invention will be described below with reference to the drawings. The same parts as those of the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

A first embodiment of a plug according to the present invention is constructed as shown in FIGS. 1 and 2. In FIGS. 1 and 2, reference numeral 4 denotes a first conductive material made of phosphor bronze. blade,
Reference numeral 4a denotes a rhombus portion formed in the shape of a rhombic plate on the end side of the conductive blade 4 provided inside the plug case 1; 4b, a concave portion formed at the right end corner of the rhombus portion 4a; External connection part to be connected to the receptacle (not shown) of the outlet,
5 is a conductive plate, one end of which is a second conductor, which is crimped and joined to a conductor, 5a is inserted into the concave portion 4b and the concave portion 4b
The end 10 of the conductive plate facing the inner surface is a connecting portion where the recess 4b and the end 5a of the conductive plate are connected to face each other.

Reference numeral 6 denotes a fusible member which is a concave portion 4b for electrically connecting the rhombus portion 4a and the end portion 5a of the conductive plate at the connecting portion 10. The fusible member 6 is made of a low melting point solder. A (predetermined temperature) lower than the upper limit of the use temperature of the heat-resistant vinyl chloride resin (75 ° C., according to a ministerial ordinance that stipulates technical standards for electric appliances) is used. For example, as shown in Table 1,
As a fusible material, a wood alloy having a melting point of 60.5 ° C. or 6
For example, a ribobitz alloy at 8.0 ° C., an alloy containing In at 46.7 ° C., or the like is used.

[0018]

[Table 1]

Reference numeral 7 denotes a space formed around the diamond-shaped portion 4a, and reference numeral 8 denotes a conductive blade holding member formed to hold a central portion of the conductive blade 4 and open a space around the central portion of the diamond-shaped portion 4a. . Reference numeral 9 denotes a conductive plate holding member which holds the conductive plate 5 and forms a space around the left end from the center of the conductive plate end 5a and the rhombus 4a. The conductive blade holding material 8 and the conductive plate holding material 9 are molded from a thermoplastic resin such as a phenol resin (melamine phenol resin, upper limit of operating temperature 130 ° C., according to a ministerial ordinance that defines technical standards for electrical appliances). .

That is, the space 7 is a space formed in a rhombic plate shape by the conductive blade holding material 8 and the conductive plate holding material 9, and the shape of the space 7 is as shown in FIG. In order for the fusible body 6 to be quickly separated from the conductive plate 5,
An inclined surface is provided on the side surface of the space 7 so that the solder flows smoothly to the bottom. Further, since the space 7 and the rhombus portion 4a are vertically symmetrical, they are the same even if the plug is turned upside down in FIG.

The plug is manufactured by double molding described below. That is, the electrode plate 5 is molded so as to be held by the electrode plate holding material 9, the conductive blade 4 is formed so as to be held by the conductive blade holding material 8, and the distance between the recess 4 b of the conductive blade and the electrode plate end 5 a is reduced. Then, the plug case 1 is formed by covering the conductive blade holding material 8 and the electrode plate holding material 9 with vinyl chloride.

Next, the operation of the first embodiment will be described with reference to FIGS.
This will be described with reference to FIG. Note that, in FIG.
Indicates the vertical downward direction. First, in FIG. 2, the side of the conductive blade 4 is perpendicular to the horizontal plane, and the conductive blade 4 of the plug is inserted into a receiving blade (not shown) of an outlet and is energized to an electric device. When the external connection portion between the conductive blade 4 and the receiving blade generates heat due to poor contact between the fusible member 6 and the receiving blade, the heat is transmitted to the fusible member 6 and heated. Thus, the body 6 flows toward the bottom.

The above-mentioned dissolved container 6 is shown in FIG.
As shown in the figure, it accumulates at the bottom of the space 7. by this,
The conductive blade 4 and the conductive plate 5 are electrically separated, and the heat generation stops. In addition, since the fusible body melts at the melting point and blows off, the plug can be prevented from excessively increasing the temperature of each part.

When the plug is to be regenerated, after the fusible material in the state shown in FIG. 3 has cooled, the plug is fixed with the external connection portion 4c directed vertically upward as shown in FIG. When the external connection portion 4c of the conductive blade 4 is heated by a soldering iron or the like, the fusible body 6 is melted and the end of the rhombus portion 4a of the conductive blade 4 is connected to the end 5a of the conductive plate as shown in FIG. After the fusible body 6 is cooled, the plug can be used.

FIGS. 7 and 8 show a case in which the external connection portion 4c of the conductive blade 4 is used with being directed directly downward. Note that the direction of arrow A in FIGS. 7 and 8 indicates a vertically downward direction. When the container 6 is overheated and melted at first, as shown in FIG. 8, it flows into the diamond-shaped portion 4a and the lower end of the space 7, and the conductive blade 4 and the conductive plate 5 Is electrically separated to stop heat generation, thereby preventing overheating of the plug. The reproduction of the plug is performed in the same manner as described above.

As described above, the plug of the first embodiment prevents the external connection portion 4c of the conductive blade 4 from being heated from the horizontal direction to the vertically downward direction. However,
In the first embodiment, when the fusible member 6 is overheated by using the external connection portion 4c of the conductive blade 4 upward from the horizontal direction, the fusible member 6 may flow to interrupt the connection. Can not. Therefore, an embodiment in which overheating can be prevented when the external connection portion 4c of the conductive blade 4 is used so as to face upward from the horizontal direction will be described below.

FIG. 9 or FIG. 10 shows a second embodiment of the plug of the present invention. In FIG. 9 or FIG. 10, reference numeral 40 denotes a conductive blade made of phosphor bronze, and 40 a denotes a plug case 1. The end of the conductive blade 40 of the conductive blade 40
0c is an external connection portion exposed to the outside of the plug and connected to a receiving blade (not shown) of an external outlet, 50 is a conductive plate having one end caulked and joined to the conductor 3, 50a is a rhombus at the other end of the conductive plate 5 The reference numeral 50b denotes a concave portion formed at the left end corner of the rhombic portion 50a. The conductive blade end 40a is inserted into the recess 50b, and faces the inner surface of the recess 50b with an interval.

Reference numeral 50c denotes a heated portion integrally formed with the conductive plate 50 at the time of reproduction, and 5d denotes an exposed surface exposed on the outer surface of the plug of the heated portion 50c to prevent a finger from contacting the exposed surface 50c. In order to do so, the exposed surface 50c is slightly sunk to the inner surface side from the outer surface of the plug and is exposed,
The exposed area of the exposed surface 50c is sufficiently small.

Reference numeral 6 denotes a fusible body for electrically connecting the diamond-shaped portion 50a and the conductive blade end portion 40a with a concave portion 50b. 7 is a diamond-shaped portion 50 for storing the dissolved fusible material 6.
Reference numeral 8 denotes a space formed around the a, and a conductive blade holding member formed at intervals around the center of the diamond-shaped portion 4a. Reference numeral 9 denotes a conductive plate holding member formed with a space around the conductive blade end portion 40a and the rhombus portion 50a.

That is, in the space 7, the conductive blade holding material 8 and the conductive plate holding material 9 are formed in a diamond shape with respect to the side surface and the outer peripheral surface of the rhombus portion 50a and the conductive blade end portion 40a as described above. It is a space that did.

Next, the operation of the second embodiment will be described. Note that the direction of arrow A in FIGS. 10 and 11 indicates vertically downward. First, as shown in FIG. 10, the side surface of the conductive blade 40 is at right angles to the horizontal plane, and the conductive blade 40 of the plug is inserted into the receptacle (not shown) of the outlet and the electric product is energized. When the connection portion between the conductive blade 40 and the receiving blade generates heat due to poor contact between the conductive blade 40 and the receiving blade, the heat is transmitted to the fusible member 6 and heated, and when the temperature of the fusible member 6 reaches the melting point, the fusible member 6 is heated. Are dissolved, and the container 6 flows toward the bottom.

Then, the above-mentioned dissolved body 6 is
As shown in FIG. 1, the heat accumulates at the bottom of the space 7, the conductive blade 40 and the conductive plate 50 are electrically separated from each other, and the heat generation stops. When the plug is to be regenerated, after the plug in the state shown in FIG. 11 has cooled, the plug is fixed with the external connection portion 40c directed vertically downward as shown in FIG. 12, and the exposed surface 50d of the conductive plate 50 is soldered. When heated with iron, etc., heat is exposed 50d
When the fusible element 6 is transmitted to the rhombus part 50a via the heated part 50c and reaches the melting point, the fusible element 6 is melted and connected to the end of the rhombus part 50a and the conductive blade end 40a. After the fusible member 6 has cooled, it returns to a solid state as shown in FIG. Further, in the second embodiment, overheating can be prevented even when the external connection portion 4c of the conductive blade 4 is used directly upward. As described above, the plug of the second embodiment can be used in a state where the direction of the external connection portion 40c of the conductive blade 40 is from the horizontal direction to the vertically upward direction.

A plug according to a third embodiment of the present invention is configured as shown in FIG. 13, and the direction of arrow A in FIG. 13 is vertically downward, and is the same as that of the first embodiment. Are denoted by the same reference numerals and description thereof is omitted. And FIG.
As shown in the cross-sectional view of FIG. 5, the cross-sectional shape of the space 70 forms an inclined surface 70a in which the portions 8 and 9 are sandwiched between the pair of rhombus portions 4a and 4a and are inclined toward the inner surface side.
Thus, in the state shown in FIG. 13, when the conductive blades 4 and 4 are used by installing the plugs at positions vertically arranged, when the fusible material 6 is melted by overheating, the space 70 located above
The fusible body 6 flows and accumulates on the inclined surface 70a, and the conductive blade 4 and the conductive plate 5 are electrically separated, and the heat generation stops.

[0034]

Since the plug according to the present invention has the above-described structure, the invention according to claim 1 is characterized in that when the fusible material is heated to a predetermined temperature, it flows from the connection portion to the bottom portion and the first conductor and the first conductor are connected to each other. 2
Since the power supply to the conductor is interrupted, accidents such as deformation and ignition of the plug due to overheating can be prevented. Further, after the energization is cut off, the bottom of the space is located above the connection portion, and the fusible body at the bottom is heated to a predetermined temperature, so that the fusible material flows from the bottom to the connection portion, and the first conductor and the second conductor are connected to each other. The plug can be easily regenerated because the electrical connection between the plug and the conductor is regenerated. According to the second aspect of the present invention, by heating one end of the heated portion, the fusible material that has been melted and accumulated in the space and cooled can be reheated and melted, so that the plug can be easily regenerated. .

According to the third aspect of the present invention, the first conductor and / or the second conductor is heated at one end exposed to the outside of the case to dissolve the fusible material, thereby forming the first conductor and / or the second conductor. To connect the second conductor again with a soluble body,
Plugs can be easily regenerated. Furthermore, in the invention according to claim 4, since the dissolved fusible material flows along the inclined surface and flows without being hindered at the bottom, the connection at the time of heating and the reconnection at the time of regeneration can be quickly and reliably performed. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a plug according to the present invention.

FIG. 2 is a side sectional view showing the plug of FIG. 1;

FIG. 3 is a side sectional view showing a non-energized state of the fusible body according to the first embodiment of the present invention.

FIG. 4 is a side sectional view showing a state where a connection portion of the plug of FIG. 3 is directed upward;

FIG. 5 is a side sectional view showing a state in which power supply to the plug of FIG. 4 is regenerated.

FIG. 6 is a side sectional view showing a first embodiment of a regenerated plug of the present invention.

FIG. 7 is a side sectional view showing a state in which a connection portion of the plug of FIG. 2 is directed downward.

FIG. 8 is a side sectional view showing a non-energized state of the fusible member of FIG. 7;

FIG. 9 is a cross-sectional view showing a second embodiment of the plug of the present invention.

FIG. 10 is a side sectional view showing the plug of FIG. 9;

FIG. 11 is a side sectional view showing a non-energized state of a fusible body according to a second embodiment of the present invention.

FIG. 12 is a side sectional view showing a state where a connection portion of the plug of FIG. 11 is directed downward.

FIG. 13 is a side sectional view showing a third embodiment of the plug of the present invention.

FIG. 14 is a sectional view of a conventional plug.

FIG. 15 is a graph showing the relationship between the pulling force and the temperature of the plug connection part.

FIG. 16 is a graph showing the relationship between the contact resistance and the temperature of the plug connection part.

[Explanation of symbols]

 Reference Signs List 4 conductive blade 5 conductive plate 6 fusible body 7 space 10 connecting part 50c heated part

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 13/66-13/68 H01H 85/00

Claims (4)

(57) [Claims] 1. A plug comprising a first conductor, a second conductor, and a case in which the first conductor and the second conductor are provided, wherein a plug is provided inside the case. A space in which the first conductor and the second conductor are exposed and hermetically sealed and electrically connected between the first conductor and the second conductor at a connection portion of the space. A fusible element to be connected, wherein when the fusible element is heated to a predetermined temperature, the fusible element flows from a connection portion of the space to a bottom of the space to electrically connect the first conductor and the second conductor. And the fusible body is further heated by heating the fusible body to the predetermined temperature by flowing the fusible body from the bottom portion to the connecting portion while the bottom portion is positioned above the connecting portion. A plug obtained by regenerating an electrical connection between a body and a second conductor. 2. A heated part for heating the fusible body to the predetermined temperature in order to regenerate an electrical connection between the first conductor and the second conductor, 2. The plug according to claim 1, wherein one end of the plug is connected to the first conductor and / or the second conductor, and the other end is exposed on an outer surface of the case. 3. An end of the first and / or second conductor is connected to the outside of the case in order to regenerate an electrical connection between the first and second conductors. 2. The plug according to claim 1, wherein the plug is exposed to the outside. 4. An inner surface of the space from the connection portion to the bottom portion is formed as an inclined surface.
The described plug.