JPH08273504A - Acceleration reacting switch - Google Patents

Abstract

PURPOSE: To provide an acceleration reacting switch capable of avoiding a continuous signal due to the peripheral turning movement of an inertia ball, and finishing the peripheral turning in early time. CONSTITUTION: An acceleration reacting switch 1 has a container consisting of a lid plate 2 and a housing 5 with a lead terminal 3 penetrating the lid plate 2. A conductive inertia ball 7 is housed in a container, and a contact member 6 is fixed to the end part of the lead terminal 3. The inertia ball 7 is normally positioned in the vicinity of the middle and inhibited from contacting a contact member 6. When receives vibration having a given value or higher, the inertia ball 7 is rotated on the housing rotation surface to contact the contact member 6 to electrically open/close the housing 5 and the contact member 6. Even when the inertia ball 7 begins to peripherally turns along the side wall of the housing 5, the inertia ball 7 contacts a shock-contact part 5C to change a moving direction to make the contact, between the contact member 6 and the inertia ball 7, into noncontinuous contact, thereby preventing the continuous output of an ON signal; and the moving energy of the inertia ball 7 is quickly reduced, thereby preventing the generation of an undesired signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acceleration responsive switch for detecting earthquake vibrations, etc., and is intended to reliably distinguish earthquake vibrations from disturbance vibrations.

[0002]

2. Description of the Related Art Conventionally, as an acceleration responsive switch of this type, there is, for example, Japanese Patent Application No. 4-272387 entitled "Seismic Sensing Device". This seismic sensor has an electrode that is electrically insulated and fixed in a metal container and houses a conductive ball so that it can swing, and when the conductive ball swings due to shaking, it contacts the electrode. By doing so, the container and the electrode are electrically short-circuited and a detection signal is emitted.

In recent years, such a seismic sensor has been attached to a gas flow meter such as city gas or propane gas installed in each home so that not only the flow rate is recorded but also a secondary disaster such as a fire caused by an earthquake is prevented. In order to provide a function for early detection such as gas leakage, a so-called microcomputer gas flow meter with a built-in microcomputer (hereinafter referred to as a microcomputer meter) has begun to be used. This microcomputer meter has a built-in microcomputer and battery, detects vibrations and falls due to an earthquake, abnormally large outflow of gas, and long-term outflow of a small amount of gas, etc., and closes the built-in solenoid valve etc. The accidents caused by these are prevented before they occur.

Regarding the detection of an earthquake, it is necessary to distinguish between the vibration of an earthquake caused by the collision of a flying object on the microcomputer meter, the artificial vibration caused by the traveling of a car or the construction site, and the vibration of an earthquake. For that purpose, it is necessary for the seismic sensor to exhibit a predetermined operating characteristic in the frequency band which is the vibration region of the earthquake, and to exhibit another operating characteristic in the other frequency bands.

For example, the vibration of an earthquake is a combination of vibrations of various frequencies, but mainly vibrations of 10 Hz or less, particularly 5 Hz or less, are used as a substitute characteristic of the earthquake in the inspection of seismic devices. For example 3.3Hz, 2Hz, 1.4
It is performed by applying a sine wave vibration of 3 Hz. Therefore, for example, in a seismic sensing device using a seismic sensitive device having a contact point that is turned on and off by swinging an inertial element such as a conductive sphere, for example, one ON signal whose duration is 40 milliseconds or more is used. Also, when the off signal is output within a predetermined time, for example, three times or more in three seconds, the microcomputer determines that an earthquake occurs and outputs a signal to distinguish it from other disturbance vibrations.

In order to distinguish the earthquake from the disturbance vibration by such a method, the seismoscope outputs different signals in the frequency band which is the vibration region of the earthquake and other frequency bands. It is necessary to apply a sine wave of 3.3Hz, 2Hz, 1.43Hz for substituting the vibration of the earthquake, for example. It is necessary to operate a safety device such as closing the shut-off valve so that the microcomputer does not perform the control operation even if the vibration is 300 gal for vibration of 5 Hz or more, for example, 6 Hz to 7 Hz or more, which does not substitute the vibration of the earthquake.

[0007]

These conventional control devices such as microcomputer meters are often installed outdoors because of meter reading and the like. For example, they are installed on the outer wall of a building with piping. Therefore, depending on the installation location, it may face a passageway of a person or a children's playground. For example, when a person passes by, a person's body, luggage, a bicycle, etc. may hit, or a catch ball, etc. may hit. In this case, although there is some difference depending on the distance between the support positions of the fixing fittings of the gas pipe, etc., after a shock wave of 1000 to 3000 gal, the vibration acceleration is attenuated from about 1000 gal of a sine waveform at a cycle of about 10 Hz. It was confirmed by the experiment that is applied to the gas meter.

Since such a vibration has a frequency of about 10 Hz, theoretically the signal from the seismic sensor is synchronized with this cycle, so that at least the ON signal or the OFF signal does not reach 40 milliseconds, and for example, the ON time. If the OFF times are equal, the ON signal and the OFF signal of 25 milliseconds, which are considerably shorter time intervals than this, are emitted, so that the microcomputer does not perform the control operation in which the earthquake is recognized.

However, a spherical body is used as an inertia element in a cylindrical or hemispherical container, for example, the above-mentioned Japanese Patent Application No. 4-272.
In something like the 387 seismometer, a large shock may cause the inertial motion to move undesirably along the inner wall of the container or the electrodes. For example, the contact between the inertial element and the electrode is biased, or a slight acceleration component in a direction intersecting with the vibration direction acts due to a slight imbalance of unevenness on the rolling portion 5D. Off the
The resonance of the inertial sphere and the movement in that direction are amplified from the conical bottom surface shape within a certain range within a certain frequency, for example, 7 Hz to 10 Hz, and an orbital movement such as an elliptical orbit or a circular orbit along the contact member or the container is performed. May start. In such a case, the interval between the on-time and the off-time, which corresponds to 1/4 of the cycle time determined by the vibration frequency, becomes completely irregular. That is, if the on-time and the off-time are designed to occur, for example, the maximum frequency for generating the on-time and off-time of 40 milliseconds is 6.25 Hz. Is greater than 6.25Hz due to continuous contact between the inertial element and the electrode, eg 8Hz or 10Hz
A continuous ON signal is generated for more than 0 milliseconds. For example, when the control device such as the gas meter itself tilts or falls for some reason such as a large earthquake, a repeated signal from the seismic sensor cannot be expected, so if a continuous ON signal continues for a predetermined time, for example, 1 second or more. The controller is adapted to operate. Therefore, if the aforementioned circular motion of the inertial sphere generated by the impact of a disturbance does not converge rapidly, the ON signal may continue for a set time or longer and the control device may operate, making it difficult to distinguish between an earthquake and disturbance vibration. ing.

Therefore, the present applicant has filed Japanese Patent Application No. Hei 5-2699981.
No. 3, an acceleration contact switch is provided with an abutting portion on the inner wall surface of the housing, and when the inertial sphere is given a rotational force along the inner wall of the housing, the inertial ball intermittently abuts the abutting portion to change the course. It was proposed that the contact between the inertial sphere and the contact member be disturbed discontinuously.

In this acceleration-responsive switch, when the inertia sphere hits the projection, which is the abutting portion, at a slight angle when swinging, the inertia sphere reaches the side wall of the housing, and the amplitude of the inertia sphere decreases. Since it does not occur, the contact time with the contact member is hardly affected. However, when the protrusions, which are the abutting portions, are provided at even intervals at even intervals, the inertial sphere may reciprocate between the wall surfaces between the protrusions without colliding with the protrusions during rocking. On the contrary, if the inertial sphere hits the protrusion from the front, it may reciprocate between the two protrusions at symmetrical positions. The amount of protrusion of the projection, which is the abutting part, inside the container is selected to be such a height that the contact between the inertia sphere and the contact member is hardly obstructed even if the inertia sphere comes into contact with this projection, but it reciprocates between the protrusions. There is a difference in the contact time between the inertia sphere and the contact member between the case of reciprocating the wall surface and the case of reciprocating between the wall surfaces, and as a result, the signal characteristics may vary depending on the vibration direction, and the vibration may not be detected correctly. There is.

[0012]

The features of the acceleration responsive switch of the present invention are as set forth in the claims. Particularly, a conductive solid inertial sphere is housed inside the container, and the inertial sphere is generated by receiving vibration. Is an acceleration responsive switch configured to roll and contact the contact member to displace its vane-shaped portion and slide, and at the same time short-circuit the inner surface of the housing and the contact member via an inertia ball. On the inner surface of the housing, an odd number of contact portions are provided at substantially even intervals on a wall surface portion of the inertia sphere which is irrelevant at the time of rest and contacts when a predetermined acceleration is applied, and the inertia sphere swings in the housing. When it is struck, the path is changed by abutting against the abutting portion to intermittently output a signal with less variation due to the vibration direction, and the inertial sphere is given an undesired rotational force along the inner wall of the housing. Time Lies in that it is configured such that the contact between the inertia ball and the contact member inertia ball is caused to change the path and abuts the 該衝 contact portion does not continue.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of the acceleration responsive switch of the present invention, and FIG. 1 is a vertical cross section thereof taken along line B- of FIG.
FIG. 2 is a sectional view taken along the line B, and FIG. 2 is a sectional view taken along the line AA of the acceleration response switch of FIG. The acceleration responsive switch 1 has a metal circular lid plate 2, and a through hole 2A is formed in the center of the lid plate 2, and a conductive lead terminal 3 is inserted into the through hole 2A. It is airtightly insulated and fixed by an electrically insulating filler 4 such as glass. A flange portion 2B is provided on the peripheral portion of the cover plate 2, and the opening end of a cylindrical metal housing 5 having a bottom is hermetically fixed to the flange portion 2B by a method such as ring projection welding so that the damping fluid is long. A closed container is constructed so that it does not leak over a period of time.

A contact member 6 made of a conductive material is conductively fixed to the tip of the lead terminal 3 inside the closed container by welding or the like. The contact member 6 has a plurality of blade-shaped portions 6A having supple elasticity, and the contact portion with the inertial sphere 7 described later is arranged substantially concentrically around the conductive terminal pin 3. If the mass of the inertial sphere is about 0.7 grams,
The material of the contact member 6 has a thickness of 0.01 to 0.0, for example.
A 3 mm phosphor bronze plate is used.

An electrically conductive inertial sphere 7, which is an inertial member, is housed in the closed container, and is normally positioned on a stationary portion 5B provided near the center of the conical housing bottom surface 5A when stationary in a normal posture. are doing. The inertia sphere 7 is a conductive solid sphere such as iron, copper, or an alloy thereof, and the side wall 5E inside the housing or a later-described side wall 5E as shown by a dotted line on the bottom surface 5A of the housing due to vibration of a predetermined magnitude or more due to an earthquake or the like. It can be rolled within a range up to contacting the protrusion 5C, and can be brought into contact with and separated from the blade-shaped portion 6A of the contact member 6. A protective plate 8 is fixed to the lower surface of the fixing portion between the lead terminal 3 and the contact member 6 to prevent plastic deformation of the contact member due to collision of the inertia ball 7 with the contact member 6 near the base thereof.

On the inner side wall 5E of the container 5, there are columnar projections 5C, which are collision parts, as shown in FIG.
In this embodiment, there are five locations. This protrusion 5C
Are formed by, for example, press molding, and the number of them is determined by taking into account the resonance frequency determined by the size of the container and the sphere of inertia, the material of the sphere of inertia, etc. At the time of rocking, at least one side is always contacted. Further, the shape of the projection 5C is set so as not to affect the shape of the rolling portion 5D of the housing bottom surface 5A within which the inertial sphere 7 can actually move before hitting the side wall 5E.

Except when the inertia sphere 7 collides head-on with the projection 5C, which is an abutting portion, the inertia sphere 7 rolls in the housing 5 in an irregular orbit when it hits at an angle with a slight angle. The amplitude of the inertial sphere 7 does not change due to the vibration direction, and as a result, the contact time with the contact member 6 is not affected by the vibration direction. Further, even when the inertial sphere 7 collides head-on with the protrusion 5C during the reciprocating vibration of the inertial sphere, the protrusion 5 which is an abutting portion.
Since the position of C is an odd number, the inertia sphere reaches the housing wall surface in at least one of the amplitude directions, so the difference in contact time between the inertia sphere and the contact member is not as large as in the conventional example, and there is less variation. You can get an acceleration response switch.

The projections 5C may be provided, for example, at three locations, or of course, seven or more locations, provided that they are evenly and oddly provided on the inner circumference of the container. Further, the abutting portion may be a protrusion in which only the side wall 5E inside the housing is raised.
Also, by making the width of each container in the circumferential direction of the abutting part as narrow as possible, it is possible to minimize the chance that the inertia ball 7 collides head-on with the abutting part when the reciprocating vibration of the inertia ball and the amplitude decreases. It can be limited.

Next, the operation of the acceleration response switch will be described. The inertial sphere 7 is positioned on the stationary portion 5B of the housing bottom surface 5A when it is stationary in the normal posture, and in this state, the inertial sphere 7 does not contact the contact member 6 and the lead terminal 3, the housing 5 and the lid 2 are not contacted. Since no electrical connection is made between them, no signal is output.

When the acceleration responsive switch 1 receives horizontal vibration of a predetermined value or more, the inertia ball 7 moves the inertia ball 7 into the housing bottom surface 5A.
The contact member 6 and the housing 5 are electrically short-circuited by rolling on the rolling portion 5D of the contact member and contacting the blade-shaped portion 6A of the contact member 6, and the lead terminal 3-contact member 6-inertial sphere 7-
An electric path is formed in the path of the housing 5 and the cover plate 2, and a signal is output.

If the vibration applied to the acceleration responsive switch during the rolling of the inertial sphere as described above is reciprocating in a certain direction, theoretically the inertial sphere reciprocates on the center line of the housing determined by the vibration direction. Will be done.
However, in reality, the inertial sphere 7 abuts the projection 5C, which is the abutting portion, on at least one side of the reciprocating motion. Therefore, if the inertial sphere 7 abuts the projection 5C at a slight angle, the inertia sphere 7 7, the course can be changed, and it is possible to reduce the possibility that the swing of the inertial sphere 7 is stabilized at the maximum amplitude position and the minimum amplitude position depending on the vibration direction as in the conventional case, and there is little variation depending on the vibration direction. The signal can be output intermittently. Although unlikely, even if the inertial sphere 7 collides from the front of the protrusion 5C and makes a stable reciprocating motion, the inertial sphere 7 reaches the side wall 5E on at least one side of the reciprocating motion, so The contact time with the contact member 6 is secured, and the difference in contact time as compared with the conventional one can be eliminated.

The inertia sphere 7 deviates from the center of the housing due to the collision with the projection 5C, and the acceleration component in the direction intersecting with the swinging direction acts, so that the inertia sphere 7 has a frequency within a range of 7 Hz to 10 Hz. In a certain range, the resonance of the inertial sphere and the movement in that direction are amplified due to the bottom surface shape of the conical surface, and a circular movement such as an elliptical orbit or a circular orbit may start along the contact member or the container. In such a case, in the conventional device without the control unit 5C, the inertial sphere makes a circular movement along the side wall, and the inertial element and the electrode are continuously in contact with each other, so that a continuous ON signal is generated. In this case, if the circular motion of the inertial sphere does not converge promptly, the ON signal from the acceleration response switch continues for a set time or longer as described above, and occurs, for example, when the control device such as the gas meter tilts greatly or falls. There is a problem in that it cannot be distinguished from continuous ON signals.

However, in the present invention, the side surface 5 of the container 5
Since the protrusion 5C serving as an abutting portion is provided at E, the inertial sphere 7 abuts the protrusion 5C when the orbital movement is started, and the movement direction of the inertial sphere 7 abruptly changes to temporarily make contact between the contact member and the inertial sphere. And avoid continuous output of ON signal,
The kinetic energy of the inertial sphere 7 can be rapidly reduced by the collision with the protrusion 5C, and the orbital motion of the inertial sphere can be converged early.

When a person or a ball hits the device to which the acceleration responsive switch 1 is attached and a strong impact is applied to the device, the inertia sphere 7 runs along the housing 5 and the contact member 6 if there is no contact portion. It may start spinning and continue for more than a second. However, in the present invention, since the projection 5C is provided, continuous output of the ON signal can be avoided for the above reason. Further, since the orbital motion of the inertial sphere 7 can be converged in a short time, even if the ON signal and the OFF signal are repeatedly output, the repetition of the signal that meets the above condition can be avoided by shortening the convergence process. This prevents the microcomputer from performing an undesired control operation.

For example, in the impact test in the example, it took 20 to 30 seconds until the movement of the inertial sphere 7 converges in the case of not having the projection 5C as the abutting portion,
In the same test, those having the protrusion 5C converged in 15 seconds or less. Therefore, for example, as described above, in the case where the microcomputer determines that an earthquake occurs when the ON signal and the OFF signal each having a duration of 40 ms or more are output three times or more in 3 seconds, the ON signal of 40 ms or more is used. There are more opportunities to occur in the process of converging the motion of the inertial sphere 7, but the motion of the inertial sphere converges to a minute vibration in a state where it does not come into contact with the contact member before the motion occurs three times. With a shock, the microcomputer no longer makes a false decision that an earthquake has occurred.

The shape of the abutting portion is not limited to the projection as shown in FIG. 1, but any shape can be used as long as the inertial sphere rapidly changes its movement direction and reduces kinetic energy when it shifts to a rotational movement. For example, as shown in FIGS. 3 and 4, the structure may be such that an abutting member is fixed in the housing. In this embodiment, the same members as those in the above-mentioned example are designated by the same reference numerals and the description thereof will be omitted. The contact member 22 of the acceleration responsive switch 21 of this embodiment is formed of, for example, metal such as iron or its alloy, resin, or the like, and is substantially formed on the ring-shaped base 22A as shown in FIGS. 5 (A) and 5 (B). Odd contact portions 22B are provided at even intervals. By inserting and fixing the base portion 22A into the bottomed cylindrical housing 23, the abutting portion 22B is arranged at a predetermined position. Since the base portion 22A of the abutting member 22 is ring-shaped and the rolling portion of the inertial sphere 7 is located inside this, the abutting member 22 does not affect the basic rolling characteristics of the inertial sphere 7. .

The effect of the abutting portion 22B of the abutting member 22 is the same as that of the projection 5C described above, but since the abutting member 22 is a member separate from the housing, for example, a material thinner than the housing is used. By using a material that is easily elastically deformed, it is possible to design so that a large amount of kinetic energy of the inertia sphere 7 can be absorbed as compared with the protrusion 5C that is closer to a rigid body when it collides with the inertia sphere 7. The movement of can be converged more quickly.

Further, as shown in the transverse sectional view of the housing 35 shown in FIG. 6, the side wall 35A of the housing is formed into a polygonal shape or the curvature thereof is changed to have a non-circular sectional shape, whereby the side wall 35 is formed.
A may substantially be an abutting portion, and the structure may be such that the rotational movement of the inertial sphere 7 along the inner surface of the housing 35 is made unstable and the movement is converged. Also in this case, the housing bottom surface 3
The cross-sectional shape of the inertia ball rolling portion 35C on 5B can be kept unchanged so as not to affect the basic rolling characteristics of the inertia ball 7. In addition, if the shape is designed in consideration of the relative size with the diameter of the inertia sphere to minimize the difference in on-time caused by the difference in rolling distance depending on the rolling direction of the inertia sphere, it is possible to detect the vibration substantially. There will be no obstacles.

Next, another embodiment of the present invention will be described with reference to FIG. Also in FIG. 7, the same members as those in the above-described example are designated by the same reference numerals, and detailed description thereof will be omitted. In the acceleration responsive switch 41, the lid plate 42 is made of an electrically insulating material such as resin or ceramics, and the lead terminal 3 is fixed to the lead terminal 3 at substantially the center thereof. Housing 45
The projections 45A provided on the bottom surface and in odd-numbered locations at substantially equal intervals are the same as those of the housing 5 shown in FIG. 1, but a fixing portion 45B is provided at the opening end thereof, and the cover plate 42 is provided.
It is fixed by caulking with. Therefore, welding work becomes unnecessary and manufacturing becomes easier.

This embodiment is not a completely closed type as in the above-mentioned embodiments, but this is sufficient when used in a vacuum or in an inert atmosphere, and the inner surface of the inertia ball 7 and the container 45 is sufficient. It is used in the air like the completely sealed type by applying surface treatment such as noble metal to the contact part with the inertia sphere and the contact member 6 and using a material that does not corrode in the use atmosphere for each part. You can also do it. The fixed portion 45
By sealing the space between B and the cover plate 42 with an appropriate adhesive or the like, it is possible to give a sealing property to the extent that a viscous liquid or the like does not enter and to use it in a seismic sensor described later.

FIG. 8 shows an example in which these acceleration response switches are attached to a microcomputer meter or the like. This seismic sensor 11 has a case 12 accommodating the acceleration response switch 1. A suspension portion 13 is provided on the lead terminal 3 of the acceleration response switch 1 and is suspended by a hanger 14A of a holder 14 provided in the case 12 so as to be swingable. It is designed to be in a posture. One end of the flexible lead wires 15A and 15B is electrically connected to the cover plate 2 and the lead terminal 3 of the acceleration response switch 1, and the other end of each lead wire is a connection terminal 16A,
The conductive terminals 17A and 17B are insert-molded in the case 12 via 16B. A predetermined amount of viscous fluid 18 is filled in the case 12, and an outer lid 19 is hermetically sealed at the opening end of the case 12 such that the viscous fluid 18 does not leak out.

The seismic sensor 11 is directly attached to a printed circuit board or the like of the control device, and is connected to wiring on the board by conductive terminals 17A and 17B. Due to the structure of the acceleration responsive switch according to the present invention, the mounting posture has a great influence on the operating characteristics. For example, when the switch is tilted 1 degree from the normal posture, the operating acceleration changes by about 20 gal. Since the mounting posture requires a high degree of accuracy, it is very difficult to directly mount the acceleration responsive switch 1 on the printed circuit board in a regular posture. However, since the acceleration response switch 1 is hung in the case 12 in the seismic response device 11, if the mounting posture of the seismic response device is within the range of the allowable inclination angle, the acceleration response switch 1 automatically moves to the normal position by its own weight. Therefore, the work is easy because the precision required for mounting is not required.

The case 12 has an acceleration response switch 1
In addition, since a viscous fluid 18 such as silicone oil whose viscosity has been selected is enclosed, the acceleration responsive switch is used when the device to which the seismic sensor 1 is attached falls or suddenly tilts, or when vibration such as an earthquake occurs. 1 substantially follows the movement of the case 12 and generates an operation signal. Further, the viscous fluid 18 is selected so as to return to the normal posture within 30 seconds with respect to the inclination at the time of mounting. As described above, the seismic sensor having the structure as shown in FIG. 2 can be easily mounted and the vibration of the earthquake, the steep inclination and the fall can be surely detected.

The acceleration responsive switch used in the seismic sensor 11 of the present invention has been described in the embodiment as having a metallic lid plate, but a sufficient airtight container for the viscous fluid 18 is formed. Any resin or ceramic as shown in FIG. 7 may be used as long as it is capable of insulating and fixing conductive lead terminals. In this case, one end of the lead wire 15A shown in FIG. 2 is conductively fixed to the housing 5.

[0035]

According to the present invention, by providing an odd number of abutting portions on the inner surface of the housing at substantially equal intervals, the maximum amplitude and the minimum amplitude of the inertia sphere when the inertia sphere swings in the housing can be obtained. By reducing the difference between the two, it is possible to reduce the difference in contact time between the inertia sphere and the contact member due to the swing direction of the inertia sphere. Further, since the inertial sphere is configured to abut on the abutting portion and disturb the course discontinuously, it is possible to eliminate variations in characteristics depending on the vibration direction. In addition, by providing an abutting part on the inner surface of the housing to suppress the circular movement of the inertia ball, it is possible to prevent the continuous ON signal from being generated from the acceleration response switch. The generation of unwanted signals can be eliminated.

When the inertial sphere rolls due to impact, its kinetic energy can be quickly converged by the abutting portion, and the signal output time in the converging process can be shortened to meet the earthquake detection condition by the microcomputer. It becomes more reliable to avoid signal repetition and prevent malfunction of the microcomputer meter, and it is possible to reduce the defective rate in the case of mass production.

[Brief description of drawings]

FIG. 1 is an embodiment of an acceleration response switch of the present invention.

2 is a sectional view taken along line AA of the embodiment shown in FIG.

FIG. 3 is another embodiment of the acceleration response switch of the present invention.

FIG. 4 is a sectional view taken along line CC of the embodiment shown in FIG.

5 is an example of an abutting member used in the embodiment of FIGS. 3 and 4. FIG.

FIG. 6 is a cross-sectional view of an example of a housing of the acceleration response switch according to the present invention.

FIG. 7 is a cross-sectional view of another embodiment of the acceleration response switch of the present invention.

FIG. 8 is an example of a seismoscope using the acceleration response switch of the present invention.

[Explanation of symbols]

 1, 21, 41: Acceleration response switch 2, 42: Lid plate 3: Lead terminal 4: Electrically insulating filling material 5, 45: Housing 5C, 45A: Protrusion (impingement part) 6: Contact member 7: Inertial ball 8 : Protective plate 22: Impact member 22A: Impact part

Front page continuation (72) Inventor Katsuyuki Watanabe 4-30 Hoshocho, Minami-ku, Nagoya City Stock Company Shakata Co., Ltd. (72) Inventor Hideki Koseki 4-30 Hoseicho Minami-ku Nagoya City Stock Company Inside the factory

Claims (2)

[Claims] 1. A cover plate having a substantially circular metal plate, which is formed at a substantially central portion thereof and is airtightly fixed by penetrating a conductive lead terminal with an electrically insulating filling material, and a bottomed cylindrical conductive housing. An inclined surface is formed on the bottom surface of the housing, which gradually rises concentrically from the center toward the outside, and the opening end of the housing is airtightly fixed to the peripheral portion of the lid plate to form a closed container. A contact made of a conductive material having a plurality of lithematic elastic blade-shaped portions, each of which is formed with a contact portion arranged substantially concentrically around the conductive terminal pin at the end of the lead terminal inside the container of the lid plate. The member is electrically conductively fixed, and a conductive solid inertial sphere is housed inside the closed container so that it is located in the approximate center of the bottom surface of the housing due to gravity when it is stationary in a normal posture. Sphere rolls and contacts It is configured so as to come into contact with a member to displace its vane-shaped portion and slide, and at the same time short-circuit between the inner surface of the housing and the contact member via an inertial sphere. Irrespectively, odd-numbered abutting portions are provided at substantially even intervals on a wall surface portion that comes into contact when a predetermined acceleration is applied, and when the inertial sphere swings in the housing, the abutting portions abut on the abutting portions to move the course. By changing it, a signal with little variation due to the vibration direction is intermittently output, and when an undesired rotational force along the inner wall of the housing is applied to the inertia sphere, the inertia sphere abuts the abutting portion. An acceleration responsive switch characterized in that the path is changed so that the contact between the inertia ball and the contact member is not continuous. 2. A cover plate having a conductive lead terminal penetrating and fixed in a hole formed at a substantially center of a substantially circular plate-like body, and a bottomed cylindrical conductive housing, and a bottom surface of the housing. Has an inclined surface that gradually rises concentrically from the center toward the outside, and the opening end of the housing is fixed to the peripheral edge of the lid plate to form a container. The lead terminal and the housing are electrically connected. Made of a conductive material having a plurality of flexible blade-shaped portions, which are insulated from each other and have contact portions arranged substantially concentrically around the conductive terminal pins at the end of the cover plate of the lead terminal inside the container. The contact member is electrically conductively fixed, and a conductive solid inertial sphere is housed inside the sealed container so that it is positioned in the approximate center of the bottom surface of the housing due to gravity when stationary in a normal posture, and is subject to vibration. Causes the inertia ball to roll The contact point member comes in contact with the contact point member to displace and slide the vane-shaped portion, and at the same time, the inner surface of the housing and the contact point member are short-circuited via the inertial ball, and the inertial ball is stationary on the inner surface of the housing. Occasionally irrelevant, odd-numbered abutting portions are provided at substantially even intervals on the wall surface portion that comes into contact when a predetermined acceleration is applied, and the inertia sphere abuts against the abutting portions when swinging in the housing and advances along the path. Is changed to intermittently output a signal with little variation depending on the vibration direction, and when an undesired rotational force along the inner wall of the housing is applied to the inertia sphere, the inertia sphere abuts the abutting portion. The acceleration responsive switch is characterized in that the course of the inertia sphere and the contact member are discontinuous so that the contact is not continuous.