JPH10241523A - Electric circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the erroneous operation of an exploding means even if an exploding current is mistakenly supplied to a lead wire during assembling or inspection by realizing a short-circuited state between explosives for breaking a part of an electric circuit by explosion and the lead wire for supplying the exploding current to the exploding means and releasing this short-circuited state during use. SOLUTION: A lead wire 19 for supplying an explosion current to an exploding means including explosives 21 and an electric heater 20 for breaking a broken part including a part of an electric circuit by explosion and a lead wire connected to a control means are connected with each other by a connector 37 composed of a pair of connectors 39 and 41. Then, the pair of lead wires 19 connected to the connector 39 of the exploding means side are short-circuited by a short-circuiting plate 43. A releasing means including a projecting part 44 for releasing the short-circuited state by the short-circuiting plate 43 according to its connecting operation is provided in the connector 41 of the control means side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circuit breaker for automatically interrupting an electric circuit when an abnormality occurs when an overload current or a short-circuit current occurs.

[0002]

2. Description of the Related Art Generally, in electric circuits for automobiles and the like,
Fuses and fusible links are commonly used as a means for immediately breaking a circuit when an overload current or a short-circuit current occurs. These fuses and fusible links have a fusible conductor inside the container and have a basic structure with connection terminals led out of the container.Most of them are connected to electrical junction boxes and used. Have been.

However, the fuse and the fusible link blow out only when an overcurrent is generated and cut off the circuit, so that the circuit cannot be forcibly cut off at an arbitrary timing. Therefore, in an emergency such as when an accident occurs in a vehicle, if it is desired to forcibly shut off the circuit even without overcurrent, for safety reasons, the fuse or fusible link should be used instead of or in addition to the fuse or fusible link. It is necessary to install a circuit breaker that can forcibly cut off the circuit by the operation from.

[0004] As a circuit breaker of the latter type, Japanese Patent Publication No. 58-47809 discloses a circuit breaker in which the conductor is forcibly broken using the explosive force of explosive.
In this circuit breaker, an output fuse, an explosive, and a filament for heating the explosive are enclosed in a single enclosed glass, and an input terminal connected to the filament penetrates the enclosed glass. It is led out of the sealed glass, and the surface of the sealed glass is provided with an explosion-proof coating.

[0005] According to such a circuit breaker, the filament is heated by applying a certain amount of current or voltage to the input terminal, and the explosive is exploded by the heat. Can be forcibly broken. Therefore, when an abnormality such as a short circuit occurs in the electric circuit, the circuit can be interrupted at an arbitrary timing by controlling the input current or the input voltage to the input terminal.

[0006]

In the circuit breaker described in the above-mentioned publication, the filament constituting the detonating means for heating and exploding the explosive is connected to a power supply via a lead wire and indicates an abnormal situation. A signal, that is, a current or a voltage higher than a certain value is applied, so that the filament generates heat and explosives explode, so that the filament is caused by a malfunction at the time of assembling or noise due to disturbance or the like. There is a problem that a current may flow and cause an explosion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric circuit breaker that can reliably prevent erroneous explosion of explosives with a simple and compact configuration.

[0008]

The invention according to claim 1 is
An explosive that breaks a part of an electric circuit by an explosion, an initiating device that explodes the explosive by energization, a pair of lead wires that supply an initiating current to the initiating device, and a short-circuit plate that short-circuits the two lead wires. In use, the short-circuit plate is separated from the lead wires by the release means to release the short-circuit state of both the lead wires during use.

According to the above configuration, since the pair of lead wires connected to the detonating means is short-circuited by the short-circuit plate,
Even when an explosion current or the like is erroneously supplied to the lead wire during assembling or the like, the activation of the explosion means is prevented. In use, when the short-circuiting plate is separated from the lead wire and the short-circuit state is released, and when an abnormality occurs, the detonating means is activated and explosive explodes when the detonation current is supplied to the lead wire. become.

According to a second aspect of the present invention, in the electric circuit breaker according to the first aspect, a housing for accommodating a portion to be broken of the electric circuit, an explosive and explosive means, and a lead wire connected to the explosive means are provided. A pair of connectors coupled to the lead wires connected to the power supply control means, and of the two connectors, the connector on the explosion means side is installed in the housing, and the pair of leads connected to the connector on the explosion means side A short-circuit plate is used to short-circuit the wires, and a release means for releasing the short-circuit state of the lead wire by the short-circuit plate in accordance with the connection operation is provided on the connector on the side of the current supply control means.

According to the above configuration, since the pair of lead wires connected to the connector in the housing is short-circuited by the short-circuit plate, an explosion current or the like is supplied to the lead wires by mistake during assembly or the like. In this case as well, it is possible to prevent the detonating means from being activated. And at the time of use,
When the connector on the power supply control means side is connected to the connector in the housing, the short-circuit plate is separated from the lead wire, and the short-circuit state is released.

According to a third aspect of the present invention, in the electric circuit breaker according to the second aspect, the connector installed in the housing is fixed to the housing with a sealing material made of a synthetic resin material. It is.

[0013] According to the above configuration, the installation portion of the connector formed in the housing is sealed with the sealing material, and the intrusion of moisture into the housing from the installation portion of the connector is prevented by the sealing material. become.

According to a fourth aspect of the present invention, in the electric circuit breaker according to the second or third aspect, a seal member is provided between the connector installed in the housing and the connector connected to the connector. It was done.

According to the above construction, the connector on the detonating means side and the connector on the energization control means side installed in the housing are connected to each other, so that a seal member is provided between the connecting portions of the two connectors. The sealing material prevents moisture from entering the housing from the installation portion of the connector.

[0016]

FIG. 1 shows an electric circuit of a vehicle having an electric circuit breaker according to an embodiment of the present invention.
A circuit that cuts off a part of a power supply line 5 that connects an electric wiring 2 connected to a plurality of vehicle loads 1 and a vehicle power supply 4 to cut off the electric circuit includes the electric circuit. A rupture portion 6, collision detection means 7 for detecting that the vehicle has collided, and control means 8 for controlling the circuit rupture portion 6 to operate according to a detection signal of the collision detection means 7 are provided. I have.

As shown in FIGS. 2 and 3, the circuit breaker 6 includes a holding member 9 for the power supply line 5, an explosive seal 10 installed in the holding member 9, and a periphery of the holding member 9. It has a surrounding housing 11 and a connector 37. The holding member 9 has a blast opening 12 formed in an upper part thereof, and a main body part 14 formed with an opening 13 for installing an explosive seal part 10 therebelow.
It is made of a material having an insulating property, for example, a heat-resistant high-strength synthetic resin material such as a ceramic material or a nylon resin containing a glass filler, a PPS resin, or the like. Have been.

In the blast opening 12 of the holding member 9, a to-be-broken portion 17 is installed horizontally.
Are attached to the upper ends of the power supply wires 5 extending upward through the main body 14 of the holding member 9 via a heat storage body 18. The breakable portion 17 is formed of a thin fusible link formed so as to be surely broken by the explosive force of the explosive 21 provided in the explosive seal portion 10, and is cut off even when an overcurrent occurs. It has become.

As shown in FIG. 4, the explosive seal section 10 comprises an explosive means comprising an electric heater wire 20 having lead wires 19 connected to both ends thereof, and an explosive 21 disposed therearound. The two lead wires 19, 19 penetrate the seal member 22 and are led out below. The sealing member 22 is preferably made of an epoxy resin material or a rubber-like resin material.
And the powder 21 is directly or indirectly molded integrally with the powder and the like.

The lead wires 19, 19 led out from the sealing member 22 are inserted into the female connector 39 of the connection connector 37 installed at the lower end of the housing 11, so that the inside of the female connector 39 is removed. Is configured to be connected to the female terminal 38. The female connector 39
Is connected to the male connector 41 connected to the power supply control means comprising the control means 8 via the lead wires 58, 58. And, both connectors 3
The male terminals 40 in the male connector 41 are connected to each other.
Are connected to the female terminals 38, so that the lead wires 19, 19 are connected to the lead wires 58, 58.

In the female connector 39, as shown in FIG. 5, a short-circuit plate 43 made of a conductor having a press-contact portion 42 pressed against the left and right female terminals 38 is provided. When the left and right female terminals 38 are connected via the short-circuit plate 43 when the two lead wires 1 are not connected to each other,
9 and 19 and the electric heater wire 20 of the explosive seal portion 10 connected thereto are configured to be in a short-circuit state. In the male connector 41, both connectors 3 are provided.
9 and 41, the female terminal 38 of the female connector 39 is connected.
And a press-contact portion 42 of the short-circuit plate 43 inserted between the press-contact portion 42 and the press-contact portion 42 to separate the press-contact portion 42 from the female terminal 38, thereby releasing a short-circuit state of the lead wires 19, 19. 44 are protruded.

As shown in FIG. 2, the housing 11 has a bottom plate 2 to which the mounting portion 16 of the holding member 9 is screwed.
4, an upper cover 25 externally fitted from above so as to cover an upper part of the bottom plate 24, and a lower cover 26 externally fitted from below so as to cover the lower surface of the upper cover 25. 26 and the bottom plate 24 are formed of an insulator such as a synthetic resin material.
5 is formed of a synthetic resin material or a metal material.

The upper cover 25 is composed of a cylindrical portion 28 having a stepped portion 27 formed on the inner surface of the lower portion in contact with the upper surface of the mounting portion 16 of the holding member 9, and an upper surface portion 29 covering the upper surface. A plurality of air vent holes 30 are formed in the center of the portion 29. In addition, a filter 31 made of a reticulated metal material or a porous metal material having excellent heat resistance and thermal conductivity is attached to the lower surface of the upper plate 29, and the explosive 21 is attached to the upper surface of the upper plate 29. A waterproof sheet material 32 having a strength that can be easily broken by an explosive force is attached.

The lower cover 26 includes a bottom wall portion 33 covering the lower end opening of the upper cover 25 and a side wall portion 34 covering the lower outer peripheral surface of the upper cover 25. The bottom wall 33 is fixed to the vehicle body side mounting portion 36 by means of screws or the like while being screwed to the cylindrical portion 28 of the cover 25.

The power supply lines 5 connected to the to-be-broken portion 17
5 is a bottom plate 24 of the housing 11 and the lower cover 2
6 is drawn out through a through hole formed in the bottom wall portion 33 of the vehicle 6, one end of which is connected to the vehicle power supply 4, and the other end of which is connected to the collecting portion 3. I have. The leads 19, 19 of the explosive seal portion 10 connected to the detonating means consisting of the electric heater wire 20 are connected to the control means 8 via the connector 37 and the leads 58, 58.

The control means 8 controls the vehicle body in response to a detection signal input from a collision detection means 7 such as a G sensor for detecting an impact acceleration used in an airbag device for protecting an occupant in the event of a vehicle collision. When it is confirmed that a collision has occurred, an explosive current is supplied to the electric heater wire 20 via the lead wires 58 and 19, so that the electric heater wire 20 is heated to explode the explosive 21. Have been.

In the above configuration, when the vehicle has a collision accident, the control unit 8 supplies a detonation current to the detonation means including the electric heater wire 20 to heat the electric heater wire 20. Then, the temperature of the explosive 21 rises and explodes. And, by the explosive power of the explosive 21,
The to-be-fractured portion 17 installed above is broken, and the conduction state between the power supply line 5 and the electric wiring 2 is instantaneously cut off.

As described above, the explosive 21 that breaks a part of the electric circuit by explosion, the circuit breaker 6 having the explosion means including the electric heater wire 20 that explodes the explosive 21 by energization, and the electric heater wire 20 A pair of lead wires 19, 19 for supplying a detonation current, and both lead wires 19, 1;
9 and a short-circuit plate 43 for short-circuiting the short-circuit plate 9.
Is separated from the lead wire 19 to release the short-circuit state of the two lead wires 19, 19, so that even when the device is affected by noise or static electricity due to disturbance during assembly or inspection, etc. By preventing the current from flowing through the explosive 21, it is possible to reliably prevent the explosive 21 from erroneously exploding.

Since the short-circuit state is released by the release means at the time of use, the control means 8 is used.
Lead wires 58, 58 connected to the
9 and 19, an explosive current is supplied to the electric heater wire 20 at the time of a collision of an automobile to explode the explosive 21 quickly. The conduction state between the electric wire 5 and the electric wiring 2 is instantaneously interrupted, and current is prevented from flowing through the vehicle load 1, so that damage to the vehicle load 1 can be effectively prevented.

Further, in the above-described embodiment, the housing 11 for accommodating the ruptured portion 17 of the electric circuit, the explosive 21 and the electric heater wire 20 and the lead wires 19 connected to the electric fuse 20 are connected to each other. And a connector 3 comprising a pair of connectors 39 and 41 coupled to the lead wires 58 and 58 connected to the power supply control means (control means 8).
7 and a connector (female connector) 39 on the detonating means side
Is installed in the housing 11, and a pair of lead wires 19, 1 connected to the connector 39 on the detonating means side.
9 is configured to be short-circuited by the short-circuiting plate 43, so that the lead wires 19, 19 can be used during assembly or inspection.
Even if a detonating current flows through the
Erroneously exploded.

Then, the connector 4 on the power supply control means side
1 is provided with a release means comprising a projection 44 for releasing the short-circuit state by the short-circuit plate 43 in accordance with the coupling operation, so that the lead wire 19,
19 is easily released and the lead wires 19, 1
9 and the lead wires 58, 58 can be properly connected.

That is, by attaching the housing 11 of the circuit breaker 6 to the vehicle-body-side mounting portion 36, the female connector 39 and the male connector 41 previously mounted to the vehicle-body-side mounting portion 36 with mounting bolts and the like are provided. Are connected, and the protrusion 44 of the male connector 41 is inserted between the female terminal 38 of the female connector 39 and the short-circuit plate 43 in response to this connection operation, and the short-circuit plate 43 is Will be separated from Therefore, the operation of attaching the housing 11 and the operation of releasing the short-circuited state of the lead wires 19, 19 and connecting the lead wires 19, 19 to the lead wires 58, 58 can be performed at the same time. The attachment property can be greatly improved.

In particular, the housing 11 of the circuit breakage 6
When the vehicle body-side mounting portion 36 to which is mounted is formed by an electric connection box, the lead wires 19, 19 and the like installed in the housing 11 are connected to an electric circuit provided in the electric connection box. Since a separate cable or the like is not required, the structure of the entire system can be effectively simplified.

Further, in the above embodiment, the to-be-fractured portion 17 is provided on a part of the power supply line 5 connecting the collective portion 3 of the electric wires 2 connected to the plurality of vehicle loads 1 and the vehicle power supply 4. ,
Since the to-be-fractured portion 17 is configured to be broken by the explosive force of the explosive 21, the current flows to each vehicle load 1 by cutting off the power supply line 5 connected to the plurality of vehicle loads 1. At the same time.

The power supply line 5 itself or a part of the electric wiring 2 may be broken by the explosion of the explosive 21. However, as shown in the above embodiment, the power supply line 5 is connected to a plurality of vehicle loads 1. A breakable portion 17 made of a fusible link is provided in a part of the power supply line 5 connecting the assembled portion 3 of the electrical wiring 2 and the vehicle power supply 4, and the fusible link is connected to the explosive force of the explosive 21. In this case, there is no need to provide an installation portion for the fusible link at a position different from the circuit breakage portion 6. Therefore, there is an advantage that the structure can be simplified and the installation space can be made compact. is there.

In addition, the fractured portion 17, the electric heater wire 2
0 and the holding member 9 for holding the explosive 21 are installed in the housing 11 composed of the bottom plate 24, the upper cover 25, and the lower cover 26, so that the seal destroyed by the explosion of the explosive 21 It is possible to effectively prevent the member 22 and the like from scattering around.

In addition, the upper plate 29 of the upper cover 25
The air vent hole 30 is formed in the air vent hole, and the waterproof sheet 32 and the filter 31 are attached above and below the air vent hole 30, so that the waterproof sheet 32 prevents water from entering through the air vent hole 30 at the time of normal operation. Gunpowder 21
By breaking the waterproof sheet material 32 by the blast, the air inside the housing 11 can be guided to the outside through the air vent hole 30 to prevent the internal pressure of the housing 11 from rising. Further, the sealing material 2
The filter 31 can prevent the fragments and the like from jumping out of the air vent hole 30 to the outside.

Further, as shown in the above embodiment, the explosive seal 10 in which the electric heater wire 20 and the explosive 21 are sealed in the seal member 22 is connected to the opening 1 of the holding member 9.
3, the explosive 21 is used.
There is an advantage that the setting work such as can be performed easily and safely, and the explosive 21 can be reliably waterproofed.

The explosive seal portion 10 may be formed using a capsule 47 or the like as shown in FIG. 6 instead of the above configuration. The capsule 47 is formed of a thin stainless steel or the like into a container shape that opens only downward, and in a state where the electric heater wire 20 and the explosive 21 are filled in the capsule 47, a lid is closed so as to close the lower end opening of the capsule 47. 48
Are attached and fixed by appropriate means. This lid 48
Is provided with a pair of lead wire insertion holes 49, and a pair of lead wires 19, 19 connected to the electric heater wire 20 are led out of the capsule 47 through both the lead wire insertion holes 49.

In such a configuration, the explosive seal portion 10 which has been completed in advance can be easily installed simply by inserting it into the opening 13 of the holding member 9. Then, when the explosive 21 explodes, the thin capsule 47 is pierced upward and the explosive force is concentrated and acts on the to-be-fractured portion 17, so that the to-be-fractured portion 17 can be reliably broken. Also,
Before the explosion, the explosive 21 is sealed in the capsule 47, so that waterproofing and dustproofing can be reliably performed. Note that, in place of the electric heater wire 20, a structure in which a detonating means that generates a spark when energized is provided in the explosive seal portion 10 may be used.

Further, as shown in FIG.
0 and the female connector 39, and
After connecting the lead wire 19 to the female terminal 38 of the female connector 39, an epoxy resin is connected to the connecting portion between the lead wire 19 and the female terminal 38 through an opening 50 provided in the side wall of the female connector 39. A sealing material 51 made of a material or the like may be injected and solidified. In the case of such a configuration, the lower surface of the explosive seal portion 10 can be sealed by the sealing material 51 to effectively prevent water from entering, and the connection between the lead wire 19 and the female terminal 38 can be prevented. There is an advantage that the state can be stably maintained, and the explosive force of the explosive 21 can be prevented from extending downward by the sealing material 51.

As shown in FIG. 8, the connector on the side of the priming means comprising the female connector 39 is connected to the housing 11.
After sealing, a sealing material 53 made of an epoxy resin material or the like is injected into the lower portion of the female connector 39 through an opening 52 formed in a lower portion of the housing 11 and solidified to thereby seal the sealing. Female connector 39 by material 53
Is desirably configured to be fixed.

In the case of the above configuration, the female connector 39 can be stably attached to the housing 11, the installation portion of the female connector 39 is sealed, and the housing 11 is inserted through the opening 53. It is possible to effectively prevent moisture from entering the inside. In addition,
In order to stabilize the mounting state of the female connector 39 more effectively, it is preferable to form a concave portion 54 into which the sealing material 53 is injected, on the entire circumference or a part of the wall surface of the female connector 39. .

As shown in FIG. 9, an O-ring or square ring-shaped seal ring 55 made of a synthetic rubber material or the like is used.
Of the female connector 39 installed in the housing 11 by installing the
And the male connector 4 connected to the female connector 39.
The seal ring 55 may be interposed between the seal ring 55 and the seal ring 55. In this case, by sealing the connecting portion of the two connectors 39 and 41 with the seal ring 55, it is possible to further effectively prevent moisture from entering the housing 11 through the connecting portion. it can.
The sealing material 53 is omitted, and the sealing ring 55 is omitted.
The connection between the two connectors 39 and 41 may be sealed only by the connector.

As shown in FIG. 10, the lower portions of the lead wires 5, 5 connected to the breakable portion 17 are
And is bent out along the side surface and the lower surface of the bottom plate 24, and then is drawn out downward through the bottom wall portion 33 of the lower cover 26. Alternatively, the lead wires 5 may be fixed to the bottom plate 24 and the bottom wall portion 33 of the lower cover 26 by mounting bolts 15.

In the case of such a configuration, the installation interval between the lower portions of the lead wires 5 and 5 regulated by a connector or the like provided on the vehicle body side mounting portion 36 and the insertion hole formed in the holding member 9 are provided. Even when there is a difference between the installation intervals of the lead wires 5 and 5 regulated by the above, there is an advantage that the lead wires 5 and 5 can be easily and appropriately wired. As shown in FIG. 11, the upper portions of the lead wires 5 and 5 and the lower portions of the lead wires 5 and 5 are formed separately, and their ends are overlapped with each other at the installation portion of the mounting bolt 15. Thus, the connection may be made.

As shown in FIG. 12, an upper cover 57 having a flange 56 projecting from the lower end is fitted to the holding member 9 of the explosive seal portion 10 and a lower portion and a bottom plate of the upper cover 57 are provided. The lower cover 58 may be integrally formed of a synthetic resin material so as to surround the outside of the cover 24. With this configuration,
The upper cover 57, the bottom plate 24, and the lower cover 58
There is an advantage that the bonding strength between members and airtightness can be effectively improved.

In the above embodiment, the upper cover 25
An example in which a separate waterproof sheet 32 covering the air vent hole 30 formed in the upper surface 29 of the upper cover 29 is described above, but as shown in FIG.
5 is formed integrally with a thin blocking portion 59 for closing the upper end of the air vent hole 30, and the closed portion 59 is broken by the explosive force of the explosive 21, whereby the air vent hole 30 is formed. The inside of the housing 11 may be configured to communicate with each other through the housing.

In the above embodiment, the housing 11
An example was described in which the lead wires 19, 19 of the explosive seal portion 10 were inserted into the upper portion of the female connector 39 on the detonating means side attached to the explosive device, and the male connector 41 was connected to the lower portion. The female connector 39
A structure in which a connecting portion of the male connector 41 is provided on the lower side of the connector. Further, a male connector may be provided in the housing 11 and a female connector connected to the power supply control unit may be connected to the male connector.

Further, the connector 37 is connected to the circuit breaker 6.
Instead of the above embodiment directly connected to the housing 11,
As shown in FIGS. 14 and 15, by connecting the explosive seal portion 10 and the connector 37 via the lead wire 60 led out from the explosive seal portion 10, the circuit break portion 6 is separated from the installation position. Connector 3 in position
7 may be provided. In the case of such a configuration, the structure of the housing 11 can be simplified, the sealing performance of the explosive seal portion 10 can be easily improved, and the installation location of the connection connector 37 can be arbitrarily set. There are advantages.

Further, a vehicle load 1a such as a hazard lamp or a room lamp for notifying other vehicles of the presence of the vehicle, for example, a vehicle load that is desirably maintained in an operating state when a vehicle collision accident occurs. Is connected to the feeder line 5 upstream of the installation portion of the circuit breaker 6, so that the current is supplied to the vehicle load 1a even after the breakable portion 17 of the electric circuit is broken. It is desirable to do so.

Further, the electric circuit breaker according to the present invention is not limited to a vehicle, and various types of circuits configured to cut off a circuit when an abnormality occurs due to an overload current or a short-circuit current or the like. It can be used for electric circuits.

[0053]

As described above, according to the first aspect of the present invention, there is provided an explosive that breaks a part of an electric circuit by explosion, an explosion device that explodes the explosive by energization, and an explosion current supplied to the explosion device. And a short-circuit plate for short-circuiting both the lead wires, and the short-circuit plate is separated from the lead wires by a release means to release the short-circuit state of both the lead wires during use. At the time of assembling or inspection, it is possible to prevent a situation in which the explosive explodes erroneously under the influence of noise or static electricity due to disturbance. Then, by releasing the short-circuit state at the time of use, by connecting the lead wire connected to the detonation current supply source and the detonation means side, the detonation current is supplied at the time of a collision of an automobile or the like. Since the explosive can explode explosively, a part of the electric circuit can be broken by the explosive force to instantaneously interrupt the conduction state.

According to a second aspect of the present invention, there is provided a housing for accommodating a portion to be broken of an electric circuit, explosives and explosive means, and a lead wire connected to the explosive means to a lead wire connected to the power supply control means. A pair of connectors to be coupled, the connector on the detonating means side being installed in the housing, the pair of lead wires connected to the connector on the detonating means side being short-circuited by a short-circuit plate, and Since the release means for releasing the short-circuit state by the short-circuit plate according to the connection operation of the connector is provided, the terminal of the connector on the detonating means side and the short-circuit plate are connected according to the connection operation of the two nectars. Can be automatically released, and thereby the assemblability can be significantly improved.

According to the third aspect of the present invention, the connector installed in the housing is fixed to the housing by a sealing material made of a synthetic resin material. By sealing, there is an advantage that it is possible to effectively prevent moisture from entering the housing from the installation portion of the connector.

Further, in the invention according to claim 4, since a seal ring is provided between the connector installed in the housing and the connector connected to the connector, the connecting portion of both connectors is sealed by the seal ring. By doing so, it is possible to effectively prevent moisture from entering the housing through the connecting portion.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an electric circuit having an electric circuit breaker according to the present invention.

FIG. 2 is a sectional view showing an embodiment of an electric circuit breaker according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram showing a main part of the electric circuit breaker according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a configuration of a connection connector.

FIG. 6 is a sectional view showing another example of the explosive seal portion.

FIG. 7 is a cross-sectional view showing another example of an attached state of the explosive seal portion.

FIG. 8 is a sectional view showing still another example of an attached state of the explosive seal portion.

FIG. 9 is a cross-sectional view showing still another example of an attached state of the explosive seal portion.

FIG. 10 is a cross-sectional view showing another embodiment of the electric circuit breaker according to the present invention.

FIG. 11 is a sectional view showing still another embodiment of the electric circuit breaker according to the present invention.

FIG. 12 is a sectional view showing another example of the housing.

FIG. 13 is a sectional view showing still another example of the housing.

FIG. 14 is an explanatory diagram showing another example of the electric circuit having the electric circuit breaker according to the present invention.

FIG. 15 is a sectional view showing another example of the connection connector.

[Explanation of symbols]

 2 Electrical Wiring 5 Power Feeding Line 6 Circuit Breaking Part 8 Control Means (Electrification Control Means) 11 Housing 17 Breakable Part 19 Lead Wire 20 Electric Heater Wire (Initiating Means) 21 Explosives 43 Short-Circuit Plate 44 Protrusion (Release Means) 53 Sealing Material 54 Seal ring

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahiro Kume 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi Harness Research Institute, Inc.

Claims (4)

[Claims] 1. An explosive that breaks a part of an electric circuit by an explosion, an explosion means for exploding the explosive by energization, a pair of lead wires for supplying an explosion current to the explosion means, and a short circuit between the two lead wires. An electrical circuit breaker, wherein the short-circuit plate is separated from the lead wires by use of a release means to release the short-circuit state of both the lead wires during use. 2. A housing for accommodating a portion to be broken of an electric circuit, an explosive, and an explosive means, and a pair of connectors for connecting a lead wire connected to the explosive means to a lead wire connected to an energization control means. And, of the two connectors, the connector of the explosion means side is installed in the housing, the pair of lead wires connected to the connector of the explosion means side is short-circuited by a short-circuit plate, and the connector of the energization control means side, 2. An electric circuit breaker according to claim 1, further comprising a releasing means for releasing a short-circuit state of the lead wire by the short-circuit plate in accordance with the connecting operation. 3. A connector installed in a housing,
3. The electric circuit breaker according to claim 2, wherein the circuit breaker is fixed to the housing by a sealing material made of a synthetic resin material. 4. A connector installed in the housing,
4. An electric circuit breaker according to claim 2, wherein a seal ring is provided between said connector and said connector.