JP3018144U - Automatic circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] By inserting it into an outlet fixed to the building and interposing it between the plug on the load side and the plug on the load side, the electric circuit is automatically cut off by vibration such as an earthquake. [Structure] A mechanism that automatically shuts off the AC circuit due to vibration such as an earthquake, a plug blade 5 that fits into the blade receiver of the outlet on the power supply side fixed to the building, and one that accepts a plug for connecting to the load side The above-described outlet 6 is provided. As a mechanism for automatically shutting off the AC electric circuit by vibration, a cam 3 supported so that the center of gravity 33 is located diagonally above the rotary shaft 2, a limit switch 4 operated by the cam 3 rotated by vibration, and a fallen cam It may consist of means for returning the to the original position. Further, it is preferable to include a limit switch 45 that is operated by the rotated cam 3 and that closes the DC circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic circuit breaker equipped with a mechanism for automatically blocking a circuit due to vibration such as an earthquake by inserting it into an outlet fixed to a building and interposing it with a plug on a load side.

[0002]

[Prior art]

 For example, Japanese Utility Model Publication No. 63-45719 discloses an anti-seismic switch circuit breaker in which an earth leakage breaker is provided with a device for short-circuiting and operating a circuit by a short-circuiting rod that tilts in response to an earthquake.

[0003]

[Problems to be solved by the device]

 However, installing such an anti-seismic switch circuit breaker requires electrical work and requires a qualified electrician to install it at home, which is not easy.

An object of the present invention is to provide a device having a function of automatically interrupting an AC electric path, which can be easily installed at home.

[0005]

[Means for Solving the Problems]

 The automatic circuit breaker of the present invention is a mechanism that automatically cuts off an AC circuit due to vibration such as an earthquake, a plug blade that fits into a blade receptacle of an outlet on the power supply side fixed to a building, and a connection to the load side. Since it is characterized by having one or more outlets that accept the plugs, the problems can be solved.

In the above-described electric circuit automatic interruption device, a mechanism for automatically interrupting an AC electric circuit by vibration is operated by a cam supported so that its center of gravity is located diagonally above the rotation axis and a cam that is rotated by vibration. A limit switch, a device for returning the fallen cam to the original position, and either of the above devices may be equipped with a limit switch for shutting off the AC circuit and closing the DC circuit.

[0007]

[Action]

 The automatic circuit breaker of the present invention is configured as described above, and the plug is inserted between the outlet fixed to the building and the plug inserted in the outlet to prevent the plug from being inserted when an earthquake occurs. You can expect the same effect as pulling it out, and even if you are not an electrician, you can easily install it at home. In addition, it is small and does not get in the way when installed, it does not consume power, and because the mechanism is extremely simple, it does not break down, and maintenance and inspection is easy in normal times. It can be operated reliably in the event of an earthquake.

[0008]

【Example】

 The electric circuit automatic interruption device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of the apparatus for removing the upper lid portion of the main body case 1 for explaining the function of the electric circuit disconnecting device of the present invention, and FIG. 2 is equivalent to the line AA of FIG. FIG. 3 is a cross-sectional view of the device in the direction of the arrow in the cut section. Wiring in the device is omitted.

At the center of the main body case 1, a metal cam 3 formed in a substantially fan shape in which a part of a disk is cut out is arranged. The rotary shaft 2 fixed near the key of the cam 3 is inserted into a through hole 12 provided in the upper lid portion 11 of the case 1, and a knob 21 is fixed to the end of the rotary shaft 2 protruding from the through hole 12. Has been done. For this reason, the cam 3 can smoothly rotate about the rotation shaft 2.

When the apparatus of the present application is installed vertically, that is, when the paper surface of FIG. 1 is vertical, the knob 21 is turned so that the trailing edge 31 of the cam 3 is moved by the tip of the sensitivity adjusting screw 32 to the cam 3. The center of gravity 33 of the cam 3 is positioned diagonally above the vertical surface of the rotary shaft 2 when the rotary shaft 2 is supported. By moving the sensitivity adjusting screw 32 in and out, the angle between the vertical line passing through the axis of the rotary shaft 2 and the center of gravity 33 can be changed. That is, by reducing the angle, the device can be operated even with a slight vibration.

Therefore, when the cam 3 sways due to vibration such as an earthquake and the center of gravity 33 of the cam 3 moves to the opposite side beyond the direction of the normal of the rotating shaft 2, the cam 3 is shown by the two-dot chain line in FIG. 1 due to gravity. As described above, the rotary shaft 2 pivots and falls down.

When the rotation is further continued, the front edge 34 of the cam 3 comes into contact with the actuator 41 of the limit switch 4 to operate the limit switch 4. This limit switch 4 is wired so that the AC electric circuit is opened or shut off when the hinge lever type actuator 41 is actuated by an external force, and the electric circuit is closed in a free position where no external force is applied. ing.

A pair of plug blades 5 are projected on a bottom plate 12 of a main body case 1 of this device, and the plug blades 5 are fitted into a blade receptacle of a power source side outlet fixed to a vertical surface of a building. To use. Further, the main body case 1 is equipped with an outlet 6 for receiving a plug for connecting to a load side which is various electric appliances. One of the wire cords connected to this plug blade 5 is directly connected to the grounding side blade receiver of the outlet 6 in the device, and the other wire cord is connected to the non-grounding side of the outlet 6 via the limit switch 4. It is connected to the blade receiver.

Since the AC circuit is wired in the apparatus as described above, when the rear edge 31 of the cam 3 is supported by the tip of the sensitivity adjusting screw 32 and the cam 3 is at the standby position, that is, When the automatic circuit breaker is on standby, the limit switch 4 has its actuator in its free position and its contacts are closed, so the load side electrical equipment connected to the plug fitted in the outlet 6 is not used. It is possible.

When the cam 3 falls down due to vibration such as an earthquake and the limit switch 4 is actuated, its contact is opened and the AC circuit is automatically cut off. It is possible to prevent ignition from electric heating appliances such as heaters, cookers and toasters.

Not only in the case of an earthquake, but also when a large vibration is applied to the device such as when a plug is inserted into the outlet 6 of this device, the cam 3 may fall and the automatic circuit disconnection mechanism may work. . At this time, the outlet 6 of the apparatus cannot be used unless the knob 21 is turned to return the cam 3 to the standby position. Therefore, in order to deal with the case where the electric circuit is unknowingly interrupted, it is preferable to provide the apparatus with a sign indicating that the automatic circuit interruption mechanism is on standby and that the outlet 6 of the apparatus can be used.

As an example thereof, a through hole 15 (shown by a broken line in FIG. 1) is provided in the upper lid portion 11 of the case 1 above the inner position of the rear edge 31 of the cam 3 when the cam 3 is at the standby position. It is advisable to visually confirm that the cam 3 is in the standby position. It is also possible to install a pilot lamp or the like between the blade receivers of the outlet 6 in the apparatus and check the lighting.

Further, when the cam 3 falls down, a limit switch 45 that comes into contact with the front edge 34 of the cam 3 and closes the DC electric path is provided near the limit switch 4 that interrupts the AC electric path, and the DC jack 16 of the device is connected. If a DC switch circuit is connected to the emergency lamp via the DC plug, the battery will automatically turn on the emergency lamp at the same time as or immediately before the AC circuit is cut off. In addition to being a great help, it also serves as a sign that the instrument's socket 6 cannot be used.

FIG. 3 is a front view of the apparatus for removing the upper lid portion 11 of the main body case 1 for explaining the function of another embodiment of the automatic circuit breaker of the present invention. In this example, the notch 35 is provided in the peripheral edge 38 of the cam 3, and when the cam 3 is rotated from the standby position due to vibration and falls to the position shown by the chain double-dashed line, the tip of the spring plate 36 is The cam 3 is received and the rotation of the cam 3 is stopped.

In this way, the fallen cam 3 returns to the original standby position again due to the vibration that occurs subsequently such as the collapse of the building and the limit switch 4 is actuated, and the interrupted AC circuit is closed again. Can be prevented. In order to manually return the cam 3 whose rotation is stopped at a predetermined position to the original standby position, the knob 21 fixed to the rotary shaft 2 of the cam 3 shown in FIG. It suffices to remove the tip of the from the notch 35. The mechanism for stopping the rotation of the cam 3 at a predetermined position is not limited to the above-mentioned example, and other known methods can be adopted. If the rubber piece 37 is arranged at the front edge 34 of the cam 3 when the cam 3 falls and its center of gravity 33 moves directly below the rotating shaft 2, the impact when the cam 3 falls Can be absorbed.

Further, in this embodiment, the limit switch 4 for interrupting the AC circuit is provided with a hinge-lever type actuator 42, and when the cam 3 is at the standby position, the actuator 42 makes contact with the peripheral edge 38 of the cam 3. Press to close the AC circuit. When the cam 3 pivots or falls, the actuator 42 is deformed as shown by the chain double-dashed line to cut off the AC electric circuit. The force required to actuate the actuator 42 is about several tens of grams, and the arc of the peripheral edge 38 of the cam 3 is eccentric with respect to the rotary shaft 2, so it does not give a large load to the rotation of the cam 3. The maximum operating force is applied only at the initial stage of the rotation of the cam 3, but the sensitivity adjusting screw 32 is adjusted in consideration of the load, and the cam is oscillated with a predetermined magnitude of vibration. It is essential to determine the position of the center of gravity of the cam 3 in the standby position so that the cam 3 can rotate. When a hinge roller lever type is used as the actuator, the friction coefficient between the peripheral edge 38 of the cam 3 and the actuator can be lowered.

Also in this embodiment, when the cam 3 is at the standby position, the actuator is contact-pressurized at the peripheral edge of the cam 3 to provide the limit switch 45 for opening the DC electric path. When the cam 3 is rotated by vibration, the limit switch 45 is operated to close the contact. This DC electric line is led from the DC jack 16 of the main body case 1 to the DC plug 73 of the portable electric lamp holder 71 attached to the building shown in FIG.

The portable electric lamp 7 is provided with a DC jack 72 for receiving the DC plug 73 of the holder 71 at the bottom, and when the portable electric lamp 7 is inserted into the holder 71 in a lighting state with a switch 74 turned on, FIG. As shown in, the relay 75 of the DC jack 72 is opened, the portable electric lamp circuit is cut off, and the light is turned off. On the other hand, when the cam 3 is rotated by the vibration and the limit switch 45 is operated, the direct current circuit is closed and the portable electric lamp 7 is turned on.

In each of the above-described embodiments, the case where the limit switch is actuated by the rotation of the cam 3 is shown as a mechanism for automatically shutting off the AC electric circuit. However, in addition to the magnet type relay, various known types are known. An automatic circuit breaker can also be used.

[0025] For example, a device described in Japanese Utility Model Publication No. 63-45719, which operates by short-circuiting a circuit by a short-circuiting rod that is tilted by a vibration, a spherical body having magnetic attraction described in Japanese Utility Model Publication No. Sho 55-80831, It has a mortar-shaped inner bottom surface with a through hole at its center, and a sphere that is movably mounted on the inner bottom surface, and a sphere that faces the sphere through the through hole on the inner bottom surface. , A vibration-sensitive switch equipped with a magnet whose attachment / detachment to / from the sphere is controlled by the position of the sphere, and a switch part which is turned on / off in conjunction with attachment / detachment of the magnet.

[0026]

[Effect of device]

 Since the electric circuit automatic interruption device of the present invention is configured as described above, it has the following effects. In other words, the same effect as pulling out the plug in the event of an earthquake can be expected by simply interposing it between the outlet fixed to the building and the plug inserted into the outlet, and electrical work can be expected. Even if you are not a master, you can easily install it at home.

In addition, it is small and does not get in the way when it is installed, it consumes no power, and because the mechanism is extremely simple, it does not break down, maintenance is easy in normal times, and it is large in case of accident. It can be operated reliably in the event of an earthquake.

Furthermore, if a limit switch that closes the direct current circuit, which is operated by a rotated cam, is installed, an emergency lamp and a portable electric lamp can be automatically turned on.

[Brief description of drawings]

FIG. 1 is a front view of the device with an upper lid part removed to explain the function of an automatic circuit breaker according to an embodiment of the present invention.

2 is a cross-sectional view of the device taken along the line AA of FIG. 1 in the direction of the arrow.

FIG. 3 is a front view of the device with the upper lid part removed to explain the function of the automatic circuit breaker according to another embodiment of the present invention.

FIG. 4 is a front view of an automatic circuit breaker.

FIG. 5 is a sectional view of a portable electric lamp.

6 is an enlarged view of the DC plug and DC jack of FIG.

[Explanation of symbols]

 2 Rotating shaft 3 Cam 4 Limit switch 5 Plug blade 6 Outlet 45 Limit switch

Claims (3)

[Scope of utility model registration request] 1. A mechanism for automatically shutting off an AC electric circuit due to vibration such as an earthquake, a plug blade fitted into a blade receiver of a power source side outlet fixed to a building, and a plug for receiving a load side 1 An automatic circuit breaker equipped with more than one outlet. 2. A mechanism for automatically shutting off an AC electric circuit by vibration includes a cam supported so that its center of gravity is located diagonally above the rotation shaft, a limit switch operated by a cam rotated by vibration, and a fallen cam. The automatic circuit breaker according to claim 1, comprising means for returning to the original position. 3. The automatic circuit breaker according to claim 1, further comprising a limit switch that closes the DC circuit as well as the AC circuit.