JP3095216U - Overload protection plug - Google Patents

Abstract

(57) [PROBLEMS] To provide an overload protection plug for preventing an electric cord and a socket from being damaged due to excessive current caused by excessive load of an electric circuit. The electric cord includes a supply wire and a ground wire, and the plug includes a supply wire end insertion leg and an earth wire end insertion leg. Wherein the ground wire end insertion leg and the ground wire of the electric cord are electrically connected, and the overload protection means has a supply wire contact portion and an insertion leg contact portion; The contact portion is electrically connected to the supply wire of the electric cord, and is electrically connected to the insertion leg contact portion and the supply wire end insertion leg of the plug to be in a normal conduction state.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention relates to overload protection plugs, especially for connected electrical products. Power supply can be automatically stopped, and protection is given to electrical products, electrical cords and sockets. Regarding overload protection plugs that can be activated.

[0002]

[Prior art]

  Electrical energy provides many conveniences and rich variability to human life, It can be said to be one of the important energies that have a close relationship with the active environment. Electricity The use of energy allows the plug in the electrical cord to be pulled from the electrical product to To make an electrical connection by plugging it into the And the actual needs of the operating environment of electrical products using electrical sockets with multiple holes To comply with. However, the use of electrical energy is also dangerous It is necessary to use it with particular care, and if the electric energy is overused or used Being too long will prevent the appliance and electrical cord or socket from bearing the load If it is light, it may just destroy the electrical product, and in severe cases it may cause a fire. Yes, so the electrical cord and socket are safe for their electrical characteristics in use It is necessary to strengthen sex.

[0003]   In the case of the conventional plug, as shown in FIG. 1, the electric cord 5 and the plug 6 are provided. In the plug 6, the supply wire end insertion leg 60 and the ground wire end attachment leg 60 61 is projectingly formed, and the supply wire end insertion leg 60 and the ground end attachment leg 6 are formed. 1 is a supply wire (not shown) and a ground wire (Fig. (Not shown).

[0004]   In the case of the above-mentioned conventional plug, the electric cord has a multi-hole power socket or Plugs too many electrical products into the multi-hole power socket to connect with certain electrical products Current is excessive, electrical cords may spark, or Can cause flame burnout, which can lead to an unstable current in the electrical circuit. No damage will occur if the electric elements inside the product receive an electric current that exceeds the range that can be tolerated. It

[0005]

[Problems to be solved by the device]

  The present invention is designed to prevent electrical cords and sockets from overloading the electrical circuit. Overload protection plug to prevent large currents and damage Its primary purpose is to provide.

[0006]   Also, the present invention is damaged by appliances producing unstable current. The next aim is to provide an overload protection plug that can prevent this. It

[0007]

[Means for Solving the Problems]

  For the above-mentioned purpose, the present invention provides an electric cord, a plug and an overload protection. And a protective wire, the electric cord includes a supply wire and a ground wire, Also, the plug has a supply wire end insertion leg and a ground wire end insertion leg. The ground wire end insertion leg and the ground wire of the electrical cord and the electrical Connection, and the overload protection means is connected to the supply wire contact part and the insertion And a supply contact of the electric wire and the supply wire contact portion. Supply wire for the insertion leg contact and the plug electrically connected to the ear It is electrically connected to the end insertion leg and becomes a normal conduction state. Provide load protection plug.

[0008]   The overload protection means has a bimetal piece, and the bimetal piece has the support. A supply wire contact part having a wire wire contact part and the insertion leg contact part. Is the fixed end, and the insertion leg contact part is the free end. It is bent and deformed according to the temperature change generated by the total load current in the road, The current in the circuit is kept within the range of a fixed current, and the overload protection is performed. A positive temperature coefficient thermistor can be used as a means, and the current passing through the electric cord is When the temperature rises due to excessive temperature, the resistance of the thermistor increases and passes through. Reduce the current.

[0009]   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. , Those embodiments are provided for reference only and limit the present invention in a narrow sense. It goes without saying that it is not a thing.

[0010]

[Embodiment of device]

  As shown in Figure 2, the present invention provides an overload protection plug, which Including an electric cord 10, a plug 2 and an overload protection means 3, of which electric The cord 1 includes the supply wire 10 and the ground wire 11, 10 and the ground wire 11 do not intersect in parallel.

[0011]   In addition, the plug 2 has a supply wire end insertion leg 20 and a ground wire end insertion leg 20. Ground wire end insertion leg 21 and electric cord 1 The electric wire 11 and the supply wire end insertion leg 20 and the ground wire end. The insertion leg 21 does not intersect in parallel and the through hole 22 is additionally formed in the plug 2. ing.

[0012]   Also, the overload protection means 3 is fixed in the plug 2 and has a cover 30. , A fixed base 31 is provided outside the cover 30, and the fixed base 31 has the plug 2 The grounding end insertion leg 21 of is fixed, and the fixing tank 32 is provided in the cover 30. , The supply wire end insertion leg 20 of the plug 2 is fixed to the fixed tank 32, and fixed. The supply wire end insertion leg 20 of the plug 2 is fixed to the tank 32, and the cover 30 In addition, the supply wire connection piece 33 is fixed inside, and the supply wire connection piece 33 and the It is electrically connected to the supply wire 10 of the air cord 1 and is installed in the cover 30 at the same time. A metal piece 34 is provided on the bimetal piece 34. And the supply wire contact portion 35 serves as a fixed end, and Electrically with the supply wire connecting piece 33 to which the supply wire 10 of the cord 1 is connected When the plug 2 is connected, the insertion leg contact portion 36 becomes a free end and It is electrically connected to the ear insertion leg 20 to be in a normal conduction state. Fixed tank 32 and support A hole 37 corresponding to the through hole 22 of the plug 2 is formed between the ply wire connecting piece 33 and the ply wire connecting piece 33. A button 38 is pivotally mounted in the hole 37, and the button 38 has a pressing portion 39 and a slide. The cover is provided with the id piece 40, and one end of the pressing portion 39 is formed to be expandable and contractible. 30 and the through hole 22 of the plug 2, and the elastic member 41 is provided at the other end. Is provided, the elastic member 41 is a spring, and the slide piece 40 is simultaneously activated. The supply wire attachment leg 20 and the attachment leg contact portion 36 of the bimetal piece 34 are movable. Slide piece 40 is supported when the electric circuit is displaced between The ply wire end insertion leg 20 and the bimetal piece 34 are engaged at the point of contact and the plug is attached. 2 is the supply wire end insertion leg 20 and the ground wire insertion leg 21 and O. Bar load protection means 3, supply wire 10 of electric cord 1, and ground wire 21 After connecting and assembling, and PVC, they are integrally molded by PVC.

[0013]   As shown in FIG. 3 to FIG. 6, a power socket having a large number of holes in the electric cord 1. (Not shown) is connected to the outside, and a socket with multiple holes The product is electrically connected and the supply wire end insertion leg 20 of the plug 2 and the ground wire are connected. The overload protection hand is electrically connected to the ear end insertion leg 21 and the external power supply. The bimetallic strip 34 of stage 3 is set to a predetermined flat current, for example 15 amps. If the total current exceeds the flat-rate current, the overload protection means 3 is warmed up. The bimetal piece 34 is bent and deformed in accordance with the increase in the degree, The contact portion 36 becomes a free end, and is separated from the supply wire end insertion leg 20 of the plug 2 Then the electric circuit is cut. At the same time, the pressing portion 39 is plugged by the urging of the elastic member. 2 is projected from the through hole 22 and the slide piece 40 is used to insert the bimetal piece 34. The plug contact portion 36 and the supply wire end insertion leg 20 of the plug 2 are separated from each other, and Doing so will cause the amount of electricity used to become excessive, causing the electric wire to burn up and the power socket. Since it is possible to prevent the burnout of the electric power, it is possible to improve the safety of electricity use. Electric low When the total current is reduced due to the decrease in temperature, the temperature decreases and the free end of the bimetallic piece 34 is After returning to the original position, the pressing portion 39 is pressed to attach the slide piece 40 to the bimetallic piece 34. The leg contact portion 36 and the supply wire end insertion leg 20 of the plug 2 are separated from each other. Then, the insertion leg contact portion 36 and the supply wire end insertion leg 20 are again in contact with each other. As a result, the electric conduction state is restored.

[0014]   An electric product (not shown) can be connected to the electric cord 1 externally, and a plug 2 The wire end insertion leg 20 and the ground wire end attachment leg 21 are electrically connected to the external power source. Electrically connected, and the bimetal piece 34 of the overload protection means 3 is fitted to the electric appliance. It is set to pass a constant flat-rate current, for example 3 amps, which is not present in the electrical circuit. If a stable current flows, it will be burned out beyond the range of flat-rate current used by electrical products. The overload protection plug of the present invention can be applied to electrical products. The fuses and disconnectors can be replaced to reduce the number of elements inside electrical products. It reduces the design cost.

[0015]   As shown in FIG. 7, between the supply wire 10 and the ground wire 11 of the electric cord 1, A resistor 42 is connected in series between them, and is also connected in series with a certain light emitting element 43. , And when connected in parallel with the overload protection plug and the current is close to the flat-rate current, If the light emitting element 43 emits light and the electric product is overloaded, To warn users of the safety of electricity usage.

[0016]   As shown in FIG. 8, the overload protection means 3'is a positive temperature coefficient thermistor. The positive temperature coefficient thermistor has two metal connection legs. The metal connection leg has a supply wire contact portion 35 'and an insertion leg contact portion 36'. And the supply wire contact portion 35 'and the supply wire 10' of the electrical cord 1 '. Is electrically connected to the supply wire connecting piece 33 'to be connected with the insertion leg contact. Electrically connected to the part 36 'and the supply wire insertion leg 20' of the plug 2 ' The normal conduction state is established, the current flowing through the electric cord 1'becomes excessive, and the temperature rises. The resistance of the thermistor increases, reducing the current passing through it. Also, if the current becomes lower than the current value for operating the electric appliance, supply sufficient power. Since we do not have it, we will not be able to drive electrical products and the temperature will be normal After returning to, the resistance value of the thermistor drops, and the electrical To recover.

[0017]   Figure 9 shows the overload protection that employs the positive temperature coefficient thermistor. A resistor 42 'and a light emitting element 43' are connected in parallel to the overload protection plug of the means 3 '. The user can be informed of the overload status by making a physical connection.

[0018]   As shown in FIGS. 10 to 13, the overload protection means 3 ″ has a temperature switch. Which has a cover 30 "and an elastic conductive piece 49" in the cover 30 ". The supply wire contact portion 35 ″ and the insertion leg are provided on the elastic conductive piece 49 ″. The contact portion 36 ", and the supply wire contact portion 35" serves as a fixed end and is inserted. The wearing leg contact part 36 "becomes a free end, and the supply wire contact part 35" is externally connected. The connecting leg 47 ″ is connected and the supply wire (of the electric cord (not shown)) (Not shown), a fixed conductive piece 46 "is provided in the cover 30". , The fixed conductive piece 46 "is externally connected to a connection leg 48", and a plug (not shown) No.) supply wire insertion leg (not shown) electrically connected to the elastic conductive piece. The 46 "insertion leg contact portion 36" and the fixed conductive piece 46 "are normally contacted, Normal contact between the supply contact 36 ″ and the supply wire end leg (not shown). Are electrically connected to each other, and a bimetal piece 44 ″ is provided on a side portion of the insertion contact portion 36 ″. , The contact rod 45 ″ is provided on the surface of the bimetal piece 44 ″, and If the edge abuts the insert leg contact 36 "and the current is high, the inside of the cover 30" As the temperature rises, the bimetal piece 44 ″ is deformed by heat and faces the abutting rod 45 ″. Press the insertion leg contact part 36 "and separate it from the fixed conductive piece 46". Cut off the path, and after the temperature has dropped, the bimetallic strip 44 "will recover to its original state and insert. The wearing leg contact portion 36 "and the fixed conductive piece 46" are again brought into normal contact to form an electric circuit. Conduct.

[0019]

[Effect of device]   Therefore, when using the overload protection plug of the present invention, the following excellent Have a point. (1) The bimetallic piece is resistant to temperature changes produced by the total load current in an electric circuit. Therefore, it is bent and deformed, and the current in the electric circuit is kept within the range of the flat-rate current, The electrical cord and socket are protected from damage due to excessive current and If an unstable excessive current is generated in the road, the bimetallic piece will also be bent and deformed, cutting the electric circuit. Therefore, it is possible to prevent damage to the electronic element inside the electric product. (2) The resistance value of the positive temperature coefficient thermistor is the total load in the electric circuit. It increases or decreases according to the temperature change generated by the current, and the current in the electric circuit is It is controlled to keep it within the current range, and the electrical cord and socket can The damage caused by it can be prevented. If the unstable current in the electric circuit becomes excessive, The resistance of the lath temperature coefficient thermistor also increases, reducing the passing current and It is possible to prevent the electric power from being driven and prevent damage to electric elements in the electric product. (3) If the light emitting element is connected, the user will be wondering if the electricity used will be excessive. And can be seen, which allows you to observe the load on the electrical circuit as quickly as possible and The danger of using electricity can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional plug.

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

FIG. 3 is a side sectional view showing a case where the overload protection plug according to the first embodiment of the present invention is in an electrically conductive state.

FIG. 4 is an explanatory view showing a position of a button when the overload protection plug according to the first embodiment of the present invention is in an electrically conductive state.

FIG. 5 is a side sectional view showing a case where the overload protection plug according to the first embodiment of the present invention is in an electrical disconnection state.

FIG. 6 is an explanatory view showing a position of a button when the overload protection plug according to the first embodiment of the present invention is in an electric disconnection state.

FIG. 7 is an exploded perspective view showing a case where a light emitting diode is attached to the overload protection plug according to the first embodiment of the present invention.

FIG. 8 is an exploded perspective view showing an overload protection plug according to a second embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a case where a light emitting diode is attached to an overload protection plug according to a second embodiment of the present invention.

FIG. 10 is a side sectional view showing a case where an overload protection plug according to a third embodiment of the present invention is in an electrically conductive state.

FIG. 11 is another side cross-sectional view showing a case where the overload protection plug according to the third embodiment of the present invention is in an electrically conductive state.

FIG. 12 is a side sectional view showing a case where an overload protection plug according to a third embodiment of the present invention is in an electrically disconnected state.

FIG. 13 is another side cross-sectional view showing a case where the overload protection plug according to the third embodiment of the present invention is in an electrically disconnected state.

[Explanation of symbols]

1,1 'electric cord 2,2 'plug 3,3 ', 3 "overload protection means 10,10 'supply wire 11,11 'ground wire 20, 20 'Supply wire end insertion leg 21,21 'Ground wire end insertion leg 22 Through hole 30,30 "cover 31 fixed base 32 fixed tank 33,33 'Supply wire connection piece 34 Bimetal Piece 35,35 ', 35 "supply wire contact 36,36 ', 36 "Insertion leg contact 37 holes 38 buttons 39 Pressing part 40 slide pieces 41 Elastic member 42, 42 'resistance 43,43 'light emitting device 44 "bimetal strip 45 "abutment rod 46 "fixed conductive strip 47 ", 48" connecting legs 49 "elastic conductive strip

Claims (6)

[Scope of utility model registration request] 1. An electric cord having a supply wire and an earth wire; and a supply wire end insertion leg and an earth wire end insertion leg, wherein the ground wire end insertion leg and the earth wire of the electric cord are electrically connected. A plug configured to be electrically connected, a supply wire contact portion, and an insertion leg contact portion, and configured to be electrically connected to the supply wire contact portion and the supply wire of the electrical cord. And an at least overload protection means configured to be electrically connected so that the leg contact portion and the supply wire end insertion leg of the plug are electrically connected in a normal state. 2. The overload protection means has a cover, a fixed base is provided outside the cover, and the ground wire end insertion leg of the plug is fixed to the fixed base, and the inside of the cover is provided. Has a fixing tank, the supply wire end insertion leg of the plug is fixed to the fixing tank, and a bimetal piece is provided in the cover, and the bimetal piece is inserted into the supply wire contact portion. The overload protection plug according to claim 1, further comprising a mounting leg contact portion, the supply wire contact portion serving as a fixed end, and the insertion leg contact portion serving as a free end. 3. A supply wire connecting piece is fixed in the cover of the overload protection means, the supply wire connecting piece is electrically connected to the supply wire of the electric cord, and the supply wire contact of the bimetallic piece is made. Part is electrically connected to the supply wire connecting piece, a through hole is formed in the plug, and a hole corresponding to the through hole of the plug is formed in the cover of the overload protection means. The hole is provided with a button, and the button is provided with a pressing part and a slide piece, one end of the pressing part is extendable and protrudes from the hole of the cover and the through hole of the plug, and is elastic at the other end. A member is provided, and a spring is adopted as the elastic member, and the slide piece is simultaneously attached to the supply wire end insertion leg and the bimetal piece insertion leg contact. The overload protection plug according to claim 2, wherein the overload protection plug is slidably displaced with respect to the touch portion. 4. A positive temperature coefficient thermistor is adopted as the overload protection means, and the positive temperature coefficient thermistor has two metal connection legs, and the two metal connection legs are respectively the above overload protection. The overload protection plug according to claim 1, characterized in that it serves as a supply wire contact part and an insertion leg contact part of the means. 5. A resistor is connected in series between a supply wire and a ground wire of the electric cord, and then a light emitting device is connected in series, which is connected in parallel with an overload protection plug. The overload protection plug according to claim 1, characterized in that 6. The overload means has a cover, and an elastic conductive piece is provided in the cover, and the elastic conductive piece includes the supply wire contact portion and the insertion leg contact portion, The wire contact portion serves as a fixed end, the insertion leg contact portion serves as a free end, and the connection leg is connected to the outside of the supply contact portion, and is electrically connected to the supply wire of the electric cord, inside the cover. In addition, a fixed conductive piece is provided, the connecting leg is connected to the outside of the fixed conductive piece, and is electrically connected to the supply wire end insertion leg of the plug, and the insertion leg contact of the elastic conductive piece. Part and the fixed conductive piece to make a normal contact,
The insertion leg contact portion and the supply wire end are electrically connected to the insertion leg so as to be in a normal conduction state, a bimetal piece is provided on a side portion of the insertion leg contact portion, and a surface of the bimetal piece is provided. When the contact rod is fixed, and the other end of the contact rod contacts the insertion leg contact portion and the bimetal piece is heated and deformed, the contact rod is moved and pressed downward. The overload protection plug according to claim 1, wherein the insertion leg contact portion and the fixed conductive piece are separated from each other.