JP7692236B2 - Earthquake-sensing power cutoff device - Google Patents

Description

The present invention relates to an earthquake-sensitive power supply circuit breaker that uses vibrations caused by an earthquake to generate a pseudo earth leakage current and activate an earth leakage breaker.

This type of earthquake-sensitive power cut-off device has become widespread as a measure to prevent electrical fires in the event of an earthquake, and in recent years, for example, a plug-in type has been proposed that can be easily installed without the help of a professional, as disclosed in Patent Document 1.

This type of earthquake-sensitive power supply cutoff device, not limited to the one described in Patent Document 1, and regardless of whether it is a plug-in type or not, generally adopts a configuration in which a vibration detection means such as a earthquake-sensitive operating mechanism and a earthquake-sensitive sensor are installed inside a box-shaped case (housing), these are connected by a wiring circuit, and then covered with a cover.

JP 2022-78908 A

As described above, in the conventional seismic power supply cutoff device, almost all of the components for generating a pseudo earth leakage current to operate the earth leakage breaker are installed inside a box-shaped case, and then covered with a cover. However, the inside of the case is a small space, and it is difficult to fix the seismic operating mechanism and vibration detection means such as a seismic sensor by screwing, etc., and then connect the wiring circuit by screwing or soldering, etc. In other words, after fixing the seismic operating mechanism and vibration detection means such as a seismic sensor, the inside of the case becomes a small space with unevenness due to the presence of these objects (protrusions), so the working space becomes even narrower and the work becomes more difficult. For this reason, it takes time and effort to manufacture, and an increase in manufacturing costs is unavoidable.

The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide an earthquake-sensitive power supply cut-off device that is easy to install and can contribute to reducing manufacturing costs.

In order to achieve the above object, the seismic power supply cut-off device (2) of the present invention is a seismic power supply cut-off device (2) comprising: a case (4); a seismic operating mechanism (18) that is installed in the case (4) and that brings conductive members (22, 24) arranged in a non-contact state into a conductive state by vibration caused by a seismic intensity of a predetermined value or more; and a wiring circuit (20) that is connected to the seismic operating mechanism (18) and generates a pseudo-leakage current in a conductive state, wherein the case (4) is composed of a box-shaped case body (4A) and a cover (4B) that covers the opening side of the case body (4A), the seismic operating mechanism (18) is installed in the case body (4A), and the wiring circuit (20) is installed in the cover (4B), and when the opening side is covered with the cover (4B), the seismic operating mechanism (18) and the wiring circuit (20) are electrically connected.

According to the earthquake-sensitive power supply cutoff device of the present invention, the means for detecting earthquake vibrations (earthquake-sensitive operating mechanism) is installed in the case body, and the wiring circuit is installed in a cover separate from the case body, so that the wiring circuit can be installed without being affected by the presence of the means for detecting earthquake vibrations, and the installation work can be simplified and accelerated, thereby reducing manufacturing costs.

In the above seismic power supply cutoff device (2), the seismic operating mechanism (18) may be provided with a pair of conductive members (22, 24) arranged vertically spaced apart from each other and connected to a wiring circuit (20) with their opposing surfaces horizontal and parallel to each other, and a seismic oscillator (26) that penetrates the lower conductive member (24) of the pair of conductive members (22, 24) and is suspended so as to be able to swing, and that brings the pair of conductive members (22, 24) into a conductive state when the seismic intensity is equal to or greater than a predetermined value. This makes it possible to detect earthquake tremors with an inexpensive mechanical configuration.

In the above seismic power supply cutoff device (2), the seismic swing body (26) may include a conductive swing shaft (30) inserted into a through hole (24a) formed in the lower conductive member (24), a conductive contact member (32) formed integrally with or connected to the upper end of the swing shaft (30) and placed on the upper surface (24b) of the lower conductive member (24), and a weight (34) formed integrally with or connected to the lower end of the swing shaft (30). This allows a simple configuration to establish electrical continuity between the pair of conductive members when earthquake tremors occur.

In the above seismic power supply cutoff device (2), the pair of conductive members (22, 24) may each be formed in a plate shape, the case body (4A) may be integrally formed with a housing portion (28A, 28B) having grooves (28a, 28b) into which the pair of conductive members (22, 24) are inserted from the opening side, and the pair of conductive members (22, 24) inserted into the housing portion (28A, 28B) may be fixed in position by a cover (4B). In this way, the setting of the seismic operating mechanism is completed simply by inserting the pair of conductive members into the case body, and the position fixing of the seismic operating mechanism is completed by attaching the cover, making production easier and faster.

In the above seismic power supply cutoff device (2), the wiring circuit (20) may have a pair of contact terminals (40, 42) that contact the pair of conductive members (22, 24), respectively, and the pair of contact terminals (40, 42) may be configured to elastically deform and press against the pair of conductive members (22, 24) when the opening side is covered with the cover (4B). This makes it possible to suppress instability in electrical connection caused by separately installing the seismic operating mechanism and the wiring circuit in the case body and the cover.

In the above-mentioned seismic power cutoff device (2), the cover (4B) may be provided with a grounded plug terminal (6) and a non-grounded plug terminal (8) to be inserted into the grounded plug hole (102) and the non-grounded plug hole (104) of the grounded outlet (100) provided on the wall surface (W). This allows the installation to be performed simply by inserting the plug into the grounded outlet, and the seismic power cutoff device can be easily put into use without the assistance of a specialist. In this case, an adhesive sheet (9) for attaching and fixing the seismic power cutoff device (2) to the wall surface (W) or the grounded outlet (100) may be attached to at least a part of the periphery of the grounded plug terminal (6) and the non-grounded plug terminal (8) on the surface of the cover (4B). With this configuration, the seismic power cutoff device can be fixed to the wall surface or the grounded outlet with an adhesive sheet, making it easier to install the seismic power cutoff device. In addition, since the installed earthquake-sensitive power supply cut-off device is firmly and securely fixed, malfunction of the earthquake-sensitive power supply cut-off device, etc. can be effectively prevented.

According to the present invention, the configuration for generating a pseudo earth leakage current can be easily installed, which contributes to reducing manufacturing costs.

1 is a perspective view of a seismic power supply cut-off device according to a first embodiment of the present invention, viewed from the rear side. FIG. FIG. 2 is an exploded perspective view of the earthquake-sensitive power cut-off device shown in FIG. 1 . 2 is a rear view of the seismic power supply cutoff device shown in FIG. 1 with the seismic operating mechanism set in the case body. FIG. 2 is a diagram for explaining the connection between the seismic operating mechanism and the wiring circuit in the seismic power supply cutoff device shown in FIG. 1, where (a) is a schematic cross-sectional view, with some parts omitted, taken at the position of line X-X in FIG. 3 before the opening side of the case body is covered with a cover, and (b) is a schematic cross-sectional view, with some parts omitted, taken after the opening side is covered with a cover. 2 is a schematic circuit diagram showing the configuration of electrical wiring within a building in which the earthquake-sensing power cutoff device shown in FIG. 1 is attached to an earthed outlet. 2A and 2B are diagrams for explaining the case where the earthquake-sensitive power supply cut-off device shown in FIG. 1 operates due to shaking caused by an earthquake, where FIG. 2A shows the case where the device operates due to vertical shaking, and FIG. 2B shows the case where the device operates due to horizontal shaking. 11 is a perspective view of a seismic power supply cut-off device according to a second embodiment of the present invention, viewed from the rear side. FIG. 1 is a schematic plan view (partial cross-sectional view) showing a seismic power cut-off device attached to a wall outlet.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment
As shown in Fig. 1, the plug-in type earthquake-sensing power cutoff device 2 according to this embodiment has a rectangular parallelepiped outer shell covered with a case 4 made of non-conductive synthetic resin. The case 4 is composed of a box-shaped case body 4A and a cover 4B covering the opening side (the side indicated by the arrow S2 in Fig. 2) of the case body 4A. A non-conductive grounded plug terminal 6 and a non-grounded plug terminal 8 made of conductive metal are provided on the cover 4B so as to protrude parallel to each other and horizontally. The grounded plug terminal 6 and the non-grounded plug terminal 8 are formed integrally with large rectangular support plates 10, 12 that are fixedly embedded in the thickness of the cover 4B, respectively, and are stably supported. The grounded plug terminal 6 and the support plate 10 are integrally formed of non-conductive synthetic resin, and the support plate 12 that supports the non-grounded plug terminal 8 is formed of conductive metal.

The grounded plug terminal 6 is inserted into the grounded plug hole 102 of the grounded outlet 100 fixed in a buried state in the wall W, and the non-grounded plug terminal 8 is inserted into the non-grounded plug hole 104. The grounded plug hole 102 and the non-grounded plug hole 104 have different vertical widths to prevent the plug from being inserted upside down, and the grounded plug terminal 6 and the non-grounded plug terminal 8 have a corresponding width. The earth wire 14 and the LED lamp 16 as an indicator lamp are pulled out from the lower left side of the seismic power cutoff device 2 as seen from the front side (the side indicated by the arrow S1 in FIG. 2), and the earth wire 14 is screwed to the earth terminal 108 covered by the cover 106 of the earthed outlet 100 for grounding. In this way, the installation of the seismic power cutoff device 2 is easily completed by inserting the seismic power cutoff device 2 into the grounded outlet 100 and grounding it, and the seismic power cutoff device 2 is ready to be used and activated at a seismic intensity of a predetermined value or more. Hereinafter, the left-right direction of the case body 4A is defined as the direction as seen from the front side (the side indicated by the arrow S1 in FIG. 2).

2, the seismic power supply cutoff device 2 includes a case 4, a seismic operating mechanism 18 that is installed in the case 4 and that brings conductive members arranged in a non-contact state into a conductive state by vibration caused by a seismic intensity of a predetermined value or more, and a wiring circuit 20 that is connected to the seismic operating mechanism 18 and generates a pseudo leakage current in the conductive state between the conductive members. The seismic operating mechanism 18 is installed in the case body 4A, and the wiring circuit 20 is installed in the cover 4B, so that the seismic operating mechanism 18 and the wiring circuit 20 are electrically connected when the opening side (arrow S2 side) of the case body 4A is covered with the cover 4B.

The seismic operating mechanism 18 is arranged opposite each other with a gap in the vertical direction and connected to the wiring circuit 20, and comprises a rectangular upper plate 22 and a lower plate 24 as a pair of conductive members whose opposing surfaces are horizontal and parallel to each other, and a seismic sensor oscillator 26 that is suspended so as to be able to swing through the lower plate 24, which is the lower of the pair of conductive members, and which brings the pair of conductive members, i.e., the upper plate 22 and the lower plate 24, into a conductive state when the seismic intensity is equal to or greater than a predetermined value.

The upper plate 22 and the lower plate 24 as a pair of conductive members are each formed in a rectangular plate shape from conductive metal, and a pair of left and right storage sections 28A, 28B into which the upper plate 22 and the lower plate 24 are inserted from the opening side are integrally formed on the inner depth side (front side) of the case body 4A. The upper plate 22 and the lower plate 24 inserted into the storage sections 28A, 28B are prevented from coming off and fixed in position by the cover 4B. Each storage section 28A, 28B has an upper groove 28a into which the upper plate 22 is inserted, and a lower groove 28b into which the lower plate 24 is inserted.

The seismic oscillator 26 includes a conductive oscillation shaft 30 inserted through a through hole 24a (see FIG. 3) formed in the lower plate 24, a conductive contact member 32 integrally formed or connected to the upper end of the oscillation shaft 30 and placed on the upper surface 24b of the lower plate 24, and a cylindrical weight 34 integrally formed or connected to the lower end of the oscillation shaft 30. The contact member 32 is composed of a disk 36 and a cylindrical base 38 having a smaller diameter than the disk 36, integrally provided on the lower surface of the disk 36, and placed on the upper surface 24b of the lower plate 24. In this embodiment, the weight 34 and the base 38 are screwed to the end of the oscillation shaft 30. Either the weight 34 or the contact member 32 may be formed integrally with the oscillation shaft 30. The diameter of the through hole 24a formed in the lower plate 24 is set to be slightly larger than the outer diameter of the swing shaft 30, allowing the swing shaft 30 to tilt obliquely, i.e., to swing the seismic swing body 26. A notched recess 4A-1 for pulling out the earth wire 14 and the LED lamp 16 is formed in the lower left side surface of the case body 4A.

The wiring circuit 20 has a pair of contact terminals 40, 42 that respectively contact the upper plate 22 and the lower plate 24 as a pair of conductive members, and the pair of contact terminals 40, 42 are configured to elastically deform and be pressed against the upper plate 22 and the lower plate 24, respectively, when the opening side of the case body 4A is covered with the cover 4B.

The contact terminal 40 that contacts the upper plate 22 is formed of a spring steel plate material, and includes a base portion 40a that is arranged and fixed in a U-shaped arrangement recess 44 formed in the cover 4B, a vertical portion 40b that extends in the vertical direction from the base portion 40a, and a contact portion 40c that extends horizontally from the upper end of the vertical portion 40b. The contact portion 40c has a shape that spreads horizontally in a V-shape. Similarly, the contact terminal 42 that contacts the lower plate 24 includes a base portion 42a that is arranged and fixed in a U-shaped arrangement recess 46, a vertical portion 42b that extends in the vertical direction from the base portion 42a, and a contact portion 42c that extends horizontally from the upper end of the vertical portion 42b. The contact portion 42c has a shape that spreads horizontally in a V-shape. The vertical portion 42b of the contact terminal 42 is shorter than the vertical portion 40b of the contact terminal 40 by the vertical distance between the upper plate 22 and the lower plate 24.

The ground wire 14 is electrically connected to the base portion 40a of the contact terminal 40, and the lead wire of the LED lamp 16 is connected to the electrical path of the contact terminal 42. A resistor 48 for preventing a large current from flowing when the power is restored is connected to the base portion 42a of the contact terminal 42 by an electric wire 49, and the resistor 48 is electrically connected to the non-grounded plug terminal 8 via the support plate 12 by an electric wire 50 arranged within the thickness of the cover 4B (see FIG. 1).

3 shows the seismic operating mechanism 18 set in the case body 4A. The upper plate 22 and the lower plate 24 are a pair of conductive members whose opposing surfaces, i.e., the lower surface 22a of the upper plate 22 and the upper surface 24b of the lower plate 24, are horizontal and parallel to each other. In this embodiment, the upper plate 22 and the lower plate 24 are both formed from flat metal plates, and the positions of the upper grooves 28a and the lower grooves 28b of the accommodation sections 28A and 28B are precisely formed, so that the horizontality and parallelism of the opposing surfaces of the upper plate 22 and the lower plate 24 can be ensured simply by inserting the upper plate 22 and the lower plate 24.

The upper plate 22 and the lower plate 24 are vertically separated by a distance h1 and are arranged in a non-contact state. The bottom surface of the base 38 is in contact with the upper surface 24b of the lower plate 24, thereby electrically connecting the contact member 32 and the lower plate 24. When the seismic sensor oscillator 26 is not oscillating, i.e., when no earthquake is occurring, the upper surface 36a of the disk 36 and the lower surface 22a of the upper plate 22 are vertically separated by a distance h2, thereby causing the upper plate 22 and the lower plate 24 to be non-conductive.

By adjusting the outer dimensions of the disk 36 and the base 38, the distance (h1) between the upper plate 22 and the lower plate 24, the distance (h2) between the upper plate 22 and the disk 36, the weight of the weight 34, and the like, the degree of oscillation of the seismic oscillator 26 can be adjusted as desired. Therefore, it is possible to set the magnitude of oscillation (seismic intensity) at which the seismic operating mechanism 18 operates to generate a pseudo-current leak to any desired magnitude. In other words, the seismic operating mechanism 18 can be operated to reliably generate a pseudo-current leak at a seismic intensity equal to or greater than a predetermined value.

The electrical connection between the seismic operating mechanism 18 and the wiring circuit 20 will be described with reference to Fig. 4. When the cover 4B is separated from the case body 4A as shown in Fig. 4(a), the opening side of the case body 4A is covered with the cover 4B so that the front end surface 4B-1 of the cover 4B abuts against the rear end surface 4A-2 of the case body 4A. As shown in Fig. 4(b), the contact portion 40c of the contact terminal 40 is elastically deformed so that the V-shaped spread narrows and is pressed against the upper plate 22, and similarly, the contact portion 42c of the contact terminal 42 is elastically deformed so that the V-shaped spread narrows and is pressed against the lower plate 24. As a result, the upper plate 22 is electrically connected to the grounded plug terminal 6 and the earth wire 14, and the lower plate 24 is electrically connected to the non-grounded plug terminal 8. That is, when the upper plate 22 and the lower plate 24 are in a conductive state due to the oscillation of the seismic oscillator 26, a circuit for generating a pseudo leakage current is formed. When the opening side of the case body 4A is covered with the cover 4B, the upper plate 22 and the lower plate 24 are prevented from coming off and are fixed in position.

The case body 4A and the cover 4B may be joined together by adhesive, screws, or snap-fit connection.

As described above, the seismic power supply cutoff device 2 according to this embodiment is easily manufactured and contributes to reducing manufacturing costs because the seismic operating mechanism 18 is installed separately in the case body 4A and the wiring circuit 20 is installed separately in the cover 4B. That is, the seismic operating mechanism 18 can be installed simply by inserting the upper plate 22 and the lower plate 24 with the seismic oscillating body 26 integrally therewith into the case body 4A, and the installation process of the wiring circuit 20 is performed in the flat cover 4B and is therefore not affected by the presence of the seismic operating mechanism 18. Since it is not necessary to perform screwing, soldering, and other operations in the installation of the wiring circuit 20 in the small, uneven space where the seismic operating mechanism 18 is present, installation operations such as wiring work can be performed easily and quickly.

The materials of the upper plate 22, the lower plate 24, and the contact member 32 and the oscillating shaft 30 of the seismic oscillating body 26 are preferably iron or gunmetal, but are not particularly limited as long as they are metals having electrical conductivity. It is preferable that the materials are not susceptible to rust that inhibits electrical conductivity, that the materials are subjected to anti-rust surface treatment such as plating, that the materials are less susceptible to deterioration over time, and that the materials have a strength sufficient to prevent deformation or breakage when subjected to earthquake vibrations. On the other hand, the material of the weight 34 is not limited to being conductive, and may be a non-conductive material. The shape of the weight 34 is not limited to being cylindrical, and may be other shapes such as square or spherical.

FIG. 5 shows the configuration of electrical wiring in a building to which the seismic power cutoff device 2 is attached. A distribution board 110 installed in the building is provided with one main breaker 111, multiple branch breakers 112, and a ground fault circuit breaker 115 provided between the main breaker 111 and the branch breakers 112. The main breaker 111 is a circuit breaker incorporating a contact for opening and closing an electric circuit and an electronic circuit for controlling the opening and closing of the contact (both not shown), and is connected to a power line 120. The branch breaker 112 is connected to the main breaker 111 via a wiring 113, and is connected to multiple load devices (not shown) via an earthed outlet 100. The ground fault circuit breaker 115 is provided on the wiring 113 between the main breaker 111 and the branch breaker 112, and is designed to immediately cut off the power supply when a ground fault is detected downstream.

Next, the operation of the seismic power supply cutoff device 2 configured as above will be described. When the seismic power supply cutoff device 2 is inserted into the earthed outlet 100, the LED lamp 16 is constantly lit, and it is possible to know that the seismic power supply cutoff device 2 is in a state in which it can be operated at a seismic intensity of a predetermined value or more. When vertical shaking occurs due to an earthquake of a seismic intensity of a predetermined value or more (for example, seismic intensity 5), as shown in Fig. 6 (a), the disk 36 comes into contact with the lower surface 22a of the upper plate 22 due to the vertical movement of the seismic swinging body 26, and the swinging shaft 30 comes into contact with the lower plate 24, so that the upper plate 22 and the lower plate 24 are in a conductive state, and a pseudo earth leakage occurs. This pseudo earth leakage is detected by the earth leakage breaker 115 and the power supply is cut off.

When horizontal shaking occurs due to an earthquake with a seismic intensity of a predetermined value or more (for example, seismic intensity 5), as shown in Fig. 6 (b), the seismic sensor oscillator 26 tilts obliquely, and part of the disk 36 comes into contact with the lower surface 22a of the upper plate 22, and part of the base 38 comes into contact with the upper surface 24b of the lower plate 24, so that the upper plate 22 and the lower plate 24 are in a conductive state, and a pseudo-earthquake occurs. This pseudo-earthquake is detected by the earth leakage breaker 115 and the power supply is cut off. Here, the state in which the seismic sensor oscillator 26 is tilted at a specific angle is shown, but the range in which the seismic sensor oscillator 26 can be tilted is the entire range of 360 degrees, and in order to ensure good contact over the entire range, the disk 36 and base 38 of the contact member 32 are circular.

In the seismic power supply cutoff device 2, the seismic oscillating body 26 oscillates regardless of whether the earthquake is mainly vertical or horizontal, and the oscillating shaft 30, the disk 36, or the base 38 abuts against both the upper plate 22 and the lower plate 24, thereby making the upper plate 22 and the lower plate 24 conductive. This allows a pseudo leakage current to be generated and the leakage current breaker 115 to be activated when the seismic oscillating body 26 oscillates due to the vertical P-waves or horizontal S-waves of an earthquake, or a combination of these. This makes it possible to more reliably prevent electrical fires after an earthquake. In addition, since the wiring circuit 20 is equipped with a resistor 48, it is possible to suppress large currents when electricity is restored, and to prevent fires caused by power restoration.

Second Embodiment
Next, a second embodiment of the present invention will be described. In the description of the second embodiment and the corresponding drawings, the same reference numerals are used for the same or corresponding components as those in the first embodiment, and detailed descriptions of those components will be omitted below. In addition, matters other than those described below and those not shown in the drawings are the same as those in the first embodiment.

7 is a perspective view of the seismic power cutoff device according to the second embodiment of the present invention, seen from the rear side. As shown in the figure, the seismic power cutoff device 2 of the second embodiment has a double-sided adhesive sheet (adhesive sheet) 9 attached around the grounded plug terminal 6 and the non-grounded plug terminal 8 on the surface of the cover 4B (the surface facing the wall surface W and the outlet 100) for fixing the seismic power cutoff device 2 to the wall surface W or the earthed outlet 100. It is preferable that the double-sided adhesive sheet 9 has sufficient adhesive strength to firmly fix the cover 4B of the seismic power cutoff device 2 to the wall surface W or the earthed outlet 100 when it is attached to the wall surface W or the earthed outlet 100.

8 is a schematic plan view (partial cross-sectional view) showing the seismic power cutoff device 2 attached to the earthed outlet 100 on the wall surface W. As shown in the figure, the seismic power cutoff device 2 of this embodiment can be fixed by attaching the surface of the case 4B to the earthed outlet 100 with a double-sided adhesive sheet 9. Although not shown, the case 4B of the seismic power cutoff device 2 may be attached to the wall surface W other than the earthed outlet 100 with the double-sided adhesive sheet 9. In addition, the double-sided adhesive sheet 9 only needs to be attached to at least a part of the surface of the cover 4B, and does not necessarily need to be provided around the entire periphery of the grounded plug terminal 6 and the non-grounded plug terminal 8. For example, although not shown, it is possible to provide a double-sided adhesive sheet cut into a thin strip shape so as to extend horizontally above and below the grounded plug terminal 6 and the non-grounded plug terminal 8 on the surface of the case 4B, or to extend vertically to the left and right of the grounded plug terminal 6 and the non-grounded plug terminal 8. Alternatively, the double-sided adhesive sheet may be attached to the entire surface of case 4B, or may be provided in a ring shape surrounding the periphery of the surface of case 4B.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the claims and the technical ideas described in the specification and drawings. For example, in the above embodiment, flat upper plate 22 and lower plate 24 are used as a pair of conductive members, but it is sufficient that at least the opposing surfaces are horizontal and parallel to each other, and the overall shape does not need to be flat. In addition, the pressure contact configuration of the contact parts 40c, 42c of the contact terminals 40, 42 provided on the cover 4B with respect to the upper plate 22 and the lower plate 24 is not limited to the above, and may be performed by the fixed configuration of the cover 4B. In other words, the contact terminals 40, 42 themselves may not be elastically deformable, and may be configured such that the cover 4B presses the contact terminals with elastic force, for example, by snap-fit connection. In addition, in the above embodiment, a type in which the earth wire 14 is connected to the earth terminal 108 of the earthed outlet 100 is exemplified, but the earth wire 14 may be configured as a pin type, or may be configured to be connected to the earthed outlet 100 via an adapter equipped with a pin type earth.

In the above embodiment, a mechanical seismic sensing mechanism 18 is installed in the case body 4A, but this is not limited to an analogue vibration sensing device, and the same manufacturing cost reduction effect can be obtained even when a digital vibration sensing device (seismic sensor) is installed. In addition, in the above embodiment, a plug-in type is exemplified, but the same effect can be obtained when a wall-mounted type that does not have a plug terminal for insertion is installed.

Claims (7)

Case and
a seismic operating mechanism that is installed in the case and that brings conductive members arranged in a non-contact state into a conductive state when the conductive members are rocked by a seismic intensity of a predetermined value or more;
A wiring circuit connected to the seismic operating mechanism and configured to generate a pseudo leakage current in the conductive state;
A seismic power cut-off device comprising:
The case is composed of a box-shaped case body and a cover that covers an opening side of the case body,
The seismic operating mechanism is
a pair of conductive members arranged opposite to each other with a gap therebetween in the vertical direction and connected to the wiring circuit, the opposed surfaces of which are horizontal and parallel to each other;
A seismic sensor oscillator that brings the pair of conductive members into a conductive state when the seismic intensity is equal to or greater than a predetermined value;
Equipped with
a housing portion into which the pair of conductive members can be inserted from the opening side is integrally formed in the case body, and the pair of conductive members inserted in the housing portion are fixed in position by the cover,
This earthquake-sensitive power supply cut-off device is characterized in that the earthquake-sensitive operating mechanism is installed in the case body and the wiring circuit is installed in the cover, and when the opening side is covered with the cover, the earthquake-sensitive operating mechanism and the wiring circuit are electrically connected. The seismic power supply cutting device described in claim 1, characterized in that the seismic oscillator comprises a conductive oscillating shaft inserted into a through hole formed in the lower conductive member of the pair of conductive members, a conductive contact member formed integrally with or connected to the upper end side of the oscillating shaft and placed on the upper surface of the lower conductive member, and a weight formed integrally with or connected to the lower end side of the oscillating shaft, and is suspended in a swingable manner . The pair of conductive members are each formed in a plate shape,
2. The earthquake-sensitive power supply cutoff device according to claim 1 , wherein the housing portion of the case body has grooves into which the pair of conductive members can be inserted from the opening side . the wiring circuit includes a pair of contact terminals;
The seismic power supply cut-off device described in claim 1, characterized in that when the cover is moved from a state separated from the case body to a state covering the opening side of the case body, the pair of contact terminals abut against the pair of conductive members, respectively, thereby electrically connecting the seismic operating mechanism and the wiring circuit . Case and
a seismic operating mechanism that is installed in the case and that brings conductive members arranged in a non-contact state into a conductive state when the conductive members are rocked by a seismic intensity of a predetermined value or more;
A wiring circuit connected to the seismic operating mechanism and configured to generate a pseudo leakage current in the conductive state;
A seismic power cut-off device comprising:
The case is composed of a box-shaped case body and a cover that covers an opening side of the case body,
The seismic operating mechanism is
Installed on the case body,
The device comprises a pair of conductive members arranged opposite each other with a gap therebetween in the vertical direction, with opposing surfaces being horizontal and parallel to each other, and a seismic sensor oscillator that brings the pair of conductive members into a conductive state when a seismic intensity is equal to or greater than a predetermined value,
the wiring circuit is disposed on the cover and includes a pair of contact terminals;
This earthquake-sensitive power supply cut-off device is characterized in that when the cover is moved from a state separated from the case body to a state covering the opening side of the case body, the pair of contact terminals abut against the pair of conductive members , respectively, thereby electrically connecting the earthquake-sensitive operating mechanism and the wiring circuit. The earthquake-sensitive power cutoff device according to any one of claims 1 to 5, characterized in that the cover is provided with a grounded plug terminal and a non-grounded plug terminal that are inserted into the grounded plug hole and the non-grounded plug hole of an earthed outlet provided on a wall. The seismic power supply cutoff device according to claim 6, characterized in that an adhesive sheet is attached to at least a portion of the periphery of the grounded plug terminal and the non-grounded plug terminal on the surface of the cover for attaching and fixing the seismic power supply cutoff device to the wall surface or the earthed outlet.

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