JP4443435B2 - Earthquake sensor - Google Patents

Description

  The present invention relates to an earthquake sensor, and more particularly to an earthquake sensor that can satisfactorily sense a pitching (S wave) caused by an earthquake.

If the occurrence of an earthquake can be detected quickly and accurately by a sensor, various earthquake countermeasures can be taken based on the sensor output.
By the way, an earthquake is transmitted from the ground to the ground surface as a kind of wave. This seismic wave has an acronym for P wave (latinum primae (primary), called P wave) and S wave (latin secunde (secondary)). Called S wave), and the arrival time of P wave and S wave changes depending on the distance from the epicenter. In any case, humans and buildings on the surface of the earth sense rolling by the first P wave that arrives, and sense pitching by the next S wave that arrives. In addition, in the technical literature regarding earthquakes, there are those that describe the P wave as a longitudinal wave and the S wave as a transverse wave according to the mode of waves propagating on the ground, not the state of shaking felt by humans. Since this is a technology related to a sensor that detects an earthquake based on a shake felt by a human (a shake that appears as a phenomenon on the ground surface), in the present specification and claims, the P wave will roll and the S wave will be described as a vertical shake.

Conventional seismic sensors have a configuration in which, for example, a sphere is placed on the actuator of a microswitch, and when a roll occurs due to an earthquake, the sphere rolls sideways, the sphere is removed from the actuator, and the microswitch is switched. It has been proposed (see, for example, Japanese Utility Model Publication No. 6-6438).
No. 6-6438

The previously proposed conventional seismic sensor is mainly configured to detect roll, and is not an earthquake sensor that can accurately detect pitch (S wave). If an earthquake sensor capable of correctly detecting pitching is created, there is a problem that the configuration is complicated or the device itself becomes large.
SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to provide a small-sized earthquake sensor having a simple configuration and capable of correctly detecting pitching.

  Another object of the present invention is to provide a seismic sensor that is small in size and can correctly detect both pitch and roll.

First aspect of the present invention, and which is formed by conductors disposed in a vertical direction axis, a frame top is formed with attached insulation of the shaft, it is fitted on the shaft, along the axis and a mover of conductors can freely move up and down Te, attached to the frame, when said movable element is moved upwards, a fixed contact the movable member may contact, fixed to the lower end of the shaft a lock nut made of conductor, disposed on the locking nut, and is made of a conductor, and a spring receiving the movable element elastically provided in the frame, said fixed contacts and electrically a first terminal which is connected, is provided on the frame, first the above fixed contacts and the first terminal is electrically connected to the armature via a are insulated, the shaft and the spring and two terminals, the only free and the shaft is, Adjustably in length extending towards a seismic sensor, characterized in that attached to the frame.

請 Motomeko 2 the described invention, in the frame, when the roll by an earthquake occurs, the sphere moves in the lateral direction, characterized in that it roll sensor switch switches is attached by, a seismic sensor of claim 1 Symbol placement.

According to a third aspect of the invention, the frame has encloses the armature and the spring, the lower part of the frame is provided with a said roll sensor, the roll sensor, the sphere and micro a switch, when the roll by an earthquake occurs, the motion the sphere laterally, thereby characterized in that a sensor switches the micro-switch is a seismic sensor of claim 2 wherein.

  According to the configuration of the first aspect, when the pitching due to the earthquake occurs, the mover received by the spring moves upward along the axis and comes into contact with the fixed contact. When the mover contacts the fixed contact, the fixed contact electrically connected to the first terminal and the second terminal electrically connect to the mover electrically connected via the shaft and the spring, The first terminal and the second terminal are electrically connected. Therefore, it can be detected that pitching has occurred based on the conduction between the first terminal and the second terminal.

In use, the mover is provided so as to be freely movable up and down along an axis arranged in the vertical direction, and is elastically received by a spring. Therefore, when pitching due to an earthquake occurs, the mover reacts sensitively to pitching and moves upward along the axis.
Axis is adjustable in length protruding from the frame downward. Therefore, if the length of the shaft extending downward from the frame is increased, the movable element fitted on the shaft is lowered downward, and the distance between the movable element and the fixed contact fixed to the frame is increased. Can do. When the position of the mover is lowered relatively downward from the frame, the mover moves relatively large upward to come into contact with the fixed contact. Therefore, if the length of the shaft protruding downward from the frame is adjusted, it is possible to adjust the detection sensitivity of pitching.

The amount of protrusion of the shaft can be easily adjusted by simply rotating the shaft, for example, by cutting screws in the frame and the upper portion of the shaft.
In the configurations of the second and third aspects, the pitching can be detected by a configuration including an axis arranged in the vertical direction, a mover that can freely move up and down on the axis, and a fixed contact. In addition, the roll can be detected by a sensor structure for detecting a roll including a sphere and a micro switch provided separately from the configuration for detecting the pitch. Such a simple sensor structure for detecting roll is already known, and by combining this known configuration with the pitch sensor structure according to the present invention, both roll and pitch can be independently and correctly detected. It can be set as the seismic sensor which can be detected.

  By using the invention having the above-described configuration, it is possible to detect roll and pitch, respectively, and to help take earthquake countermeasures using the signals.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of an earthquake sensor for detecting pitching according to an embodiment of the present invention.
The pitch sensor 1 includes a frame 2 and a shaft 3. The frame 2 is made of an insulator and has a screw hole 4 through which the shaft 3 passes. The shaft 3 is formed of a conductor such as a stainless bar. A screw groove 6 that is screwed into the screw hole 4 is cut on the upper peripheral surface of the shaft 3, and is fitted into the screw hole 4, and the lower part extends to the lower side of the frame 2. Further, the upper part of the shaft 3 protrudes to the upper part of the frame 2, and an adjustment knob 5 is attached to the upper end thereof. By rotating the adjustment knob 5, the shaft 3 rotates, the screwing relationship between the screw hole 4 and the screw groove 6 changes, and the length of the shaft 3 protruding downward from the frame 2 can be adjusted. .

  A lock nut 7 made of a conductor is fixed to the lower end portion of the shaft 3, and a spring 8 made of a conductor is disposed on the lock nut 7. The spring 8 is a coil spring having a resilience against a force in the contraction direction. A movable element 9 having a so-called donut shape in plan view is fitted on the shaft 3, and the movable element 9 can freely move up and down along the shaft 3. The mover 9 is a weight of a conductor having a predetermined weight, and the lower end thereof is received by the spring 8. Therefore, the spring 8 is normally applied with a force in the contraction direction due to the weight of the movable element 9.

  On the lower surface of the frame 2, a contact holding projection 10 having a donut shape in plan view and formed of an insulator is attached concentrically with the screw hole 4. A fixed contact 11 is provided on the outer peripheral surface of the contact holding projection 10. The lower end edge of the fixed contact 11 protrudes slightly below the contact holding projection 10 so that the upper surface of the mover 9 can come into contact when the mover 9 moves upward.

An arrangement relationship among the lower surface of the frame 2, the contact holding projection 10, the fixed contact 11 and the mover 9 is shown in the perspective view of FIG. 2.
Referring to FIGS. 1 and 2, the fixed contact 11 has a cylindrical shape, and its diameter D2 is slightly smaller than the diameter D1 of the mover 9. Thereby, when the needle | mover 9 moves upwards, it can contact the lower end edge of the fixed contact 11.

A first terminal 12 is connected to the fixed contact 11 and can be electrically connected to an external circuit via the first terminal 12.
Further, a second terminal is disposed on the upper surface of the frame 2 concentrically with the shaft 3. The second terminal is electrically connected to the shaft 3. Further, a rotation regulating spring 14 is provided between the second terminal 13 and the adjustment knob 5 so as to surround the shaft 3 so that the adjustment knob 5 does not rotate in a natural state.

The second terminal 13 is electrically connected to the mover 9 via the shaft 3 (lock nut 7 and spring 8). The reason why the spring 8 and the lock nut 7 are enclosed in parentheses is that the movable element 9 comes into contact with the shaft 3 and the movable element 9 can be directly electrically connected to the shaft 3.
When pitching due to an earthquake occurs, the mover 9 moves upward along the axis 3 and can come into contact with the lower edge of the fixed contact 11. As a result, as shown in FIG. 3, the first terminal 12 and the second terminal are electrically short-circuited via the fixing contact 11, the mover 9 (the spring 8, the lock nut 7), and the shaft 3. To do. Therefore, based on the fact that the first terminal 12 and the second terminal 13 are electrically short-circuited, it is possible to detect the occurrence of pitching.

  When adjusting the sensitivity to pitching, the adjustment knob 5 may be turned to adjust the protruding amount of the shaft 3 protruding downward from the frame 2. If the protruding amount of the shaft 3 becomes longer, the position of the mover 9 fitted on the shaft 3 is lowered, the distance between the upper surface of the mover 9 and the lower end edge of the fixed contact 11 is increased, and the sensitivity to the pitching is reduced. Become. That is, it is possible to conduct with respect to relatively large pitching. Conversely, if the protruding amount of the shaft 3 protruding downward is shortened, the distance between the upper surface of the movable element 9 and the lower end edge of the fixed contact 11 can be reduced, and even a small pitching can be detected.

In the configuration described above, the contact holding projection 10 is provided on the lower surface of the frame 2, but the contact holding projection 10 is eliminated, the lower surface of the frame 2 is concentric with the shaft 3 and insulated from the shaft 3. Thus, a fixing contact may be arranged.
FIG. 4 is a diagram showing the configuration of an earthquake sensor according to another embodiment of the present invention, in which the pitch sensor 1 is arranged at the upper part and the roll sensor 20 is arranged at the lower part. In FIG. 4, the configuration of the pitch sensor 1 provided above is the same as the configuration of the pitch sensor 1 already described, and the frame 2 has a container shape surrounding the sensor unit.

A roll sensor 20 is assembled to the lower surface of the frame 2 of the pitch sensor 1. The roll sensor 20 has a known structure, but will be briefly described as follows. The casing 21 is divided into an upper chamber 22 and a lower chamber 23, a sphere 28 is accommodated in the upper chamber 22, and a micro switch is provided in the lower chamber 23. The bottom surface 24 of the upper chamber 22 has a concave conical shape with the center recessed downward. A shaft hole 25 is vertically drilled at the center, and a pin 26 is inserted into the shaft hole 25 so as to be slidable up and down. The lower end of the pin 26 is in contact with the microswitch actuator 27. At the time of non-vibration in which the sphere 28 is located at the center of the bottom surface 24, the pin 26 is pushed downward by the weight of the sphere 28, and the actuator 27 is closed. (Fig. 4 (A))
As shown in FIG. 4B, when rolling due to an earthquake occurs, the sphere 28 moves in the lateral direction in the upper chamber 22. As a result, the sphere 28 is removed from the pin 26, and the actuator 27 is displaced upward due to its elasticity to open the switch.

In response to the roll, the sphere 28 rolls on the bottom surface 24 in the horizontal direction. However, even if the pitch is caused, the actuator 27 does not open unless the pitch is a pitch that lifts the sphere 28.
On the other hand, the pitch sensor 1 provided on the roll sensor 20 can easily move the movable element 9 up and down when the vertical movement occurs. Therefore, when the fine vertical movement occurs, the movable element 9 can move. Touches the fixed contact 11 and can accurately detect pitching. (Fig. 4 (C))
When the seismic sensor according to the present invention is used, roll and pitch can be correctly detected individually by separate sensors. For this reason, the time interval from the occurrence of roll to the occurrence of pitch can be detected accurately, which can be used for detecting the epicenter.

In addition, if a pitch is not detected within a specified time after a roll is detected, a circuit configuration that does not output the occurrence of an earthquake is added to prevent malfunction and make it more accurate that an earthquake has occurred. It can be set as the sensor which can be detected in this.
The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.

  For example, the combination of the pitch sensor 1 and the roll sensor 20 has a configuration in which the pitch sensor 1 is placed on the upper side and the roll sensor 20 is placed below the pitch sensor 1 in this embodiment. A configuration in which the sensors are arranged in the horizontal direction may be employed.

It is a schematic diagram which shows the structure of the earthquake sensor for detecting the pitching which concerns on one Embodiment of this invention. It is a perspective view which shows the arrangement | positioning relationship of the lower surface of a flame | frame, a contact holding protrusion, a stationary contact, and a needle | mover. It is a figure for demonstrating conduction | electrical_connection between a 1st contact and a 2nd contact. It is a figure which shows the structure of the seismic sensor which concerns on other embodiment of this invention, (A) is a normal time, (B) is the state at the time of rolling, (C) represents the state of the sensor at the time of pitching.

Explanation of symbols

1 Pitch sensor (earthquake sensor)
2 frame 3 shaft 4 screw hole 5 adjustment knob 6 screw groove 7 lock nut 8 spring 9 movable element 10 contact holding projection 11 fixed contact 12 first terminal 13 second terminal 20 roll sensor 26 pin 27 actuator 28 sphere

Claims (3)

An axis formed by conductors arranged vertically;
A frame formed by the upper part of the shaft is mounted insulators,
Is fitted to the shaft, and the movable element conductor that can freely move up and down along the shaft,
Attached to said frame, when said movable element is moved upwards, a fixed contact the movable member may contact,
A lock nut made of fixed conductor under end of the shaft,
A spring disposed on the lock nut, made of a conductor and resiliently receiving the mover;
Provided in the frame, a first terminal that is electrically connected to the fixed contact,
Provided in the frame, and the fixed contact and the first terminal and a second terminal connected to the armature and electrically via is insulated, the shaft and the spring,
Only including,
The said shaft is attached to the said flame | frame so that the length extended below is adjustable, The earthquake sensor characterized by the above-mentioned . In the frame, when the roll by an earthquake occurs, the sphere moves in the lateral direction, thereby characterized in that the roll sensor switches switches are attached, seismic sensor of claim 1 Symbol placement. The frame has encloses the armature and the spring, the lower part of the frame is provided with a said roll sensor,
The roll sensor has the sphere and microswitches, when the roll by an earthquake occurs, the motion the sphere laterally, thereby characterized in that a sensor switches the micro-switch, The earthquake sensor according to claim 2 .

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