JPH0758222B2 - Seismic device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention is applied to, for example, a gas meter or other gas appliances, and when it senses a vibration of a predetermined value or more such as an earthquake, it automatically shuts down the power source or the combustion device. The present invention relates to a seismic sensor that achieves disaster prevention functions such as automatic fire extinguishing.

[Conventional technology and problems]

Conventionally, as this type of seismic sensitive device, as shown in FIG. 9, a seismic sensitive case 114 is swingably suspended by a mounting shaft body 113 via a hanging shaft body 113, and the seismic sensitive case 114 is used. To
For example, a sphere 115 made of a steel ball is stored in a rollable manner, and the rolling movement of the sphere 115 pushes up the mover 116,
There is known a structure in which a switch portion 117 provided on the vibration-sensing case 114 is opened and closed (for example, Japanese Patent Laid-Open No. 63-263423, Japanese Utility Model Laid-Open No. 62-193529 and Japanese Utility Model Laid-Open No. 61). -48325 gazette).

The shaft 113 is a spherical portion 113a formed on the outer peripheral surface of the upper end portion.
Is swingably supported by the bearing portion 121, and the center of the upper portion of the vibration-sensitive case 114 is fixed to the lower end portion. A fluid resistance portion 118 extending in the radial direction is provided at the upper end of the shaft body 113 so as to project, for example, an annular seal member 119 made of a seal gome,
The inner peripheral edge is fixed to the lower surface of the fluid resistance portion 118, and the outer peripheral edge is provided with the recess 1 of the attachment body 112.
The shaft body is sandwiched by the lid body 125 fitted in the opening of the 12a,
The viscous fluid 120 is filled in the space 126 composed of the 113, the fluid resistance portion 118, the seal member 119 and the lid 125, so that the fluid resistance portion 118 is immersed in the viscous fluid 120.

Now, in the seismic-sensing device having the above structure, even if the mounting body 112 is mounted in an inclined state with respect to a gas appliance (not shown) or the like at a predetermined inclination angle, the seismic-sensing case
The shaft 114 rotates about the center of rotation Q at the upper end of the shaft 113 to automatically hold the sphere receiving surface 111 in the seismic case 114 horizontally and mount the sphere 115. That is, the rotation center Q of the seismic sensing case 114 and the ball center P of the sphere 115 are located on the same perpendicular line a to achieve the automatic horizontal holding function.

In such a mounting state, when an external vibration such as an earthquake is applied, the fluid resistance portion 118 of the seismic sensitive case 114 receives fluid resistance from the viscous fluid 120 and its swinging movement is restricted. On the other hand, the inner spherical body 115 rolls and moves on the spherical body receiving surface 111 and rolls along the curved surface 124 formed on the lower surface of the mover 116 to move the mover 116 along the bearing hole 123 of the mover holder 122. It is possible to achieve the operation of pushing up and closing the switch unit 117 provided on the vibration-sensing case 114 to stop the gas supply function to the gas appliance or the like.

By the way, when the sphere 115 moves, for example, to the right side in the figure, the mover 116 is moved by the sphere 115 rolling along the curved surface 124 formed on the lower surface thereof, as shown in the schematic view of FIG. In addition, it is pushed up by sliding in the bearing hole 123 while always receiving the rotational moment M in the counterclockwise direction.

Therefore, the sliding resistance between the mover 116 and the bearing hole 123 is high, the mover 116 does not move smoothly, the responsiveness for closing the switch part 117 is poor, and it is not suitable for gas appliances and the like. When stopping the gas supply function, an unexpected situation may occur.

On the other hand, conventionally, as shown in FIG. 11, the viscous fluid 101
A vibration-sensing case 104 is swingably suspended in a mounting body 102 in which the vibration-sensing case 104 is enclosed by a suspending member 103.
The electrodes 106 and 107 that are opened and closed by the mercury 105 held on the seismic sensitive case 104 are provided, and the electrodes 106 and 107 are attached to the mounting body.
The lead wire 11 is connected to the external terminals 108 and 109 fixed to 102, respectively.
Those connected via 0,111 are known (see, for example, JP-A-63-248028).

According to this configuration, although the problem described with reference to FIG. 10 is solved, when the mercury 105 is disposed of, it not only adversely affects the environment, but also fills the inside of the outer case that constitutes the attachment body 102. The viscous fluid 101 is large and wasteful.

Further, conventionally, the bottom of the outer case that constitutes the attachment body is formed in a hemispherical shape, and a hollow hemisphere is fitted to this hemispherical bottom so as to be horizontally movable via a viscous fluid, and the upper part of the hemisphere is In addition to projecting a cylindrical protruding part downward on the lid that is a wall,
A switch part, in which a fixed electrode and a movable electrode are arranged at a predetermined interval, is provided along the inner peripheral surface of the cylindrical protrusion, and a sphere for contacting the movable electrode to open and close the switch part is the hemisphere. It is known that it is rotatably housed inside (for example, see JP-A-63-29286).

According to this configuration, the viscous fluid filled in the outer case can be made small in amount, as in the case of the seismic sensor shown in FIG.

However, since the sphere directly contacts the movable electrode that constitutes the switch section, the movable electrode is easily deformed and damaged, and the switch section cannot be opened and closed smoothly. When stopping, there is a risk of causing an unexpected situation.

[Object of the Invention]

The present invention has been made to solve the above problems, and an object of the present invention is to provide a seismoscope having high responsiveness of seismic motion and excellent reliability.

[Constitution and effect of the invention]

In the seismic shock absorber according to the present invention, a seismic shock sensitive case is swingably suspended on a mounting body via a hanging shaft, and a spherical body is formed on a spherical surface receiving surface formed on the inner surface of the bottom wall of the seismic sensitive case. It is placed so that it can roll, and a mover holder is provided on the upper part of the above-mentioned seismic case, and an annular recess is provided on the upper surface of this mover holder, and the mover is fitted into this recess from above so that it can move up and down. , A structure in which a movable contact piece is opposed to the mover, the switch part is set on the insulating base, and the mover is moved up and down by abutment based on the rolling movement of the sphere to open and close the switch part. It is characterized by having done.

According to the above configuration, when the sphere moves, the mover is pushed upward by the sphere contacting the lower surface thereof above the recess in a nearly free cantilevered state with a part of the outer periphery as a fulcrum.

Therefore, the sliding resistance between the mover and the recess is reduced, the mover moves smoothly, the response for closing the switch part is fast, and a highly reliable seismic sensor is provided. be able to.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view showing the structure of a seismoscope according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes an attachment body, which comprises a container-shaped main body 3 made of synthetic resin to be mounted on the printed circuit board 2 and a cover 4 fitted in an upper end opening of the main body 3. Reference numeral 5 is an engagement protrusion formed on the side surface of the cover 4 and engageably engageable with an engagement hole 6 formed in the peripheral wall of the main body 3.

Reference numeral 7 denotes a seismic case arranged in the attachment body 1,
The vibration-sensitive case 7 has a bottomed cylindrical case body 8, an insulating base 10 fixed to an upper opening of the case body 8,
The cap 11 is closely fixed on the insulating base 10, and a bearing 11a is formed at the center of the upper portion of the cap 11.

On the other hand, an insertion hole 15 is formed in the center of the cover 4,
The suspension shaft body 16 inserted from the inside of the cap 11 into the insertion hole 15 has a spherical portion 17 formed in the lower portion, and the retaining ring 18 fitted in the annular groove 19 in the upper portion thereof.
And is fixed to the cover 4.

A bearing hole 14 is formed in the center of the bearing portion 11a, the hanging shaft body 16 is inserted into the bearing hole 14 from below, and the bearing portion 11a is externally fitted to the spherical portion 17 of the bearing portion 11a. The seismic case 7 is swingably suspended on the suspension shaft body 16.

Reference numeral 20 denotes an elastic body as a means for horizontally holding the seismic case 7, for example, a foam rubber such as sponge, which is formed in a ring shape, and is located around the suspension shaft body 16 so as to cover the cap 11. It is interposed between the upper surface and the inner surface of the cover 4. On the inner surface of the bottom wall of the vibration-sensing case 7, a sphere receiving surface 12 having a substantially conical concave curvature surface is formed, and a sphere 13 made of, for example, a steel ball rolls in all directions of 360 ° on the sphere receiving surface 12. It is movably mounted.

A mover holder 9 is provided on top of the vibration-sensing case 7,
An annular recess 9a is formed on the upper surface of the mover holder 9 so as to be substantially concentric with a perpendicular line a passing through the swing center Q of the vibration-sensing case 7. The mover 21 is vertically movable in the recess 9a from above. An abutting annular convex portion 21a of the spherical body 13 is formed in the lower portion thereof.

22 is a movable contact piece which is supported by the insulating base 10 and is driven to open and close by the mover 21, 23 is a fixed contact piece which is fixed to the insulating base 10, and is a fixed contact which is brought into contact with and separated from the movable contact piece 22.
24 is stuck. The movable contact piece 22, fixed contact piece 23
The fixed contact 24 and the like form a switch unit 25.

26 is fixed to the insulating base 10 and the movable contact piece 22
Is a first switch terminal electrically connected to, and its outer end portion is bent upward so as to be located at the height level of the suspending portion of the vibration-sensing case 7.

27 is fixed to the insulating base 10 and the fixed contact piece 23
A second switch terminal electrically coupled to the first switch terminal 26. The outer end of the second switch terminal is bent upward so as to be located at the same level as the outer end of the first switch terminal 26.

The second switch terminal 27 is the first switch terminal 26 described above.
On the other hand, they are arranged in a substantially point-symmetrical position with the above-mentioned suspension part interposed therebetween.

A first external terminal 29, which is electrically connected to the first switch terminal 26 via a lead wire 28, is attached to the mounting body 1.
(Fig. 2) and the lead wire 30 on the second switch terminal 27.
A second external terminal 31 electrically connected through the first and second switch terminals 26 and 27, respectively, is held in a substantially point-symmetrical position sandwiching the suspension portion,
The upper end connection portions of the first and second external terminals 29 and 31 are set to the same level as the outer end portions of the first and second switch terminals 26 and 27.

The insulating tenth includes the first and second switch terminals 26,2.
First and second movable side projections 32, 33 (FIG. 2) for winding the lead wire are formed in the vicinity of each of the parts.
In addition, the mounting body 1 includes the first and second external terminals.
First and second fixed-side protrusions 34, 35 for winding the lead wire are provided near the respective 29, 31.

One end side of the one lead wire 28 is the first movable side projection.
After being wound around 32, it is connected and fixed to the first switch terminal 26 with solder or the like, and the other end side is the above-mentioned first fixed side protrusion 34.
After being wound around, it is connected and fixed to the first external terminal 29 with solder or the like.

The one end side of the other lead wire 30 has the second movable side projection 33.
And is connected and fixed to the second switch terminal 27 by soldering or the like, and the other end side is wound on the second fixed side projection 35 and then soldered to the second external terminal 31 or the like. Connection is fixed (Fig. 5).

Reference numeral 36 is a hole 37 formed in the substrate 2 and connected to the container-shaped main body 3.
Is an elastic engaging piece that engages with.

Next, the operation of the above configuration will be described.

When the seismic sensor is attached to the gas meter printed circuit board 2 as shown in FIG. 1, for example, the sphere receiving surface 12 is automatically held horizontally and the sphere 13 is placed. At this time, the sphere 13 is located at the center of the sphere receiving surface 12 of the seismic case 7, and the vertical line a passing through the center of the suspension shaft 16 indicates the rotation center Q of the seismic case 7 and the sphere of the sphere 13. Passing the center P, the mover 21 is in the lowered position, the movable contact piece 22 is in the free position, and the switch unit 25
Is open.

In such a state, when an external vibration such as an earthquake is applied, the vibration-sensitive case 7 receives the elastic force from the elastic body 20 and its swinging movement is restricted, while the internal spherical body 13 Moves on the ball receiving surface 12 and contacts the convex portion 21a of the mover 21 by external vibration of a predetermined value or more, pushes up the mover 21, and the movable contact piece 22 is displaced to contact the fixed contact 24. Then, the switch unit 25 is closed (FIG. 3) to achieve the operation of stopping the gas supply function to the gas appliance or the like.

Further, as shown in FIG. 4, when the seismic sensor is attached to a gas appliance or the like with an inclination angle θ with respect to the horizontal plane H, the seismic case 7 is suspended from the mounting body 1. A horizontal posture is maintained by rotationally displacing a spherical portion 17 provided on the lower portion of the lowering shaft body 16.

Therefore, the sphere 13 does not roll and does not affect the operation characteristics of the seismic sensor. In addition, when a relative rotational force acts between the mounting body 1 and the vibration-sensing case 7, the elastic body
The shock-absorbing case 7 exerts a damper function by the elastic force of 20
The excessive shaking of is suppressed. That is, when the vibration is equal to or less than the predetermined value, it plays a role of automatically maintaining the horizontal posture without performing the seismic motion, so that the stable operation can be achieved even in the inclined mounting state.

In such a state, when an external vibration such as an earthquake is applied, the switch portion 25 is closed by almost the same operation as described in FIG. 3, and the vibration detecting operation can be achieved. .

By the way, according to the above configuration, when the sphere 13 moves to the right side in FIG. 1, for example, the mover 21 is schematically illustrated in FIG. 8 by the sphere 13 that abuts on the annular recess 21a provided on the lower surface of the mover 21. As shown in the figure, the counterclockwise rotation moment M
While always receiving, the recess 9a with a part N of the outer periphery as a fulcrum
It is pushed up in a cantilevered state, which is almost free.

Therefore, the sliding resistance between the mover 21 and the recess 9a is reduced, the mover 21 is smoothly moved, the responsiveness for closing the switch 25 is fast, and the gas for gas appliances and the like is fast. It is possible to provide a highly reliable seismic sensor when the supply function is stopped.

Further, according to the above embodiment, when electrically connecting the first switch terminal 26 and the second external terminal 29 with the lead wire 28, as shown in FIG. 5 and FIG. Since both ends of the lead wire 28 are wound around the movable-side protrusion 32 and the fixed-side protrusion 34 and then connected and fixed to the switch terminal 26 and the external terminal 29 by soldering or the like, the lead wire 28 has both ends with the protrusions 32 and 34. It is temporarily held, and automation such as soldering can be achieved.

Particularly, the first switch terminal 26 and the first external terminal 29
Since the connecting part of is at the same height level as the suspending part of the seismic case 7 and is set in a substantially point-symmetrical position with the suspending part sandwiched, the lead wire 28 can be drawn around with a space, Moreover, the movement of the connecting portion is small, and therefore, the movement of the seismic case 7 is restricted, and the possibility that the lead wire 28 is disconnected is reduced.

The same applies to the configuration in which the lead wire 30 connects between the second switch terminal 27 and the second external terminal 31.

Also, attach both ends of the lead wire 28 (30) to the movable side projection 32.
(33) and the fixed side projection 34 (35)
Even if unreasonable tension is applied to the lead wire 28 (30), the movable side protrusion 32 (33) and the fixed side protrusion 34 (35)
It is absorbed in the lead wire winding portion at, so that disconnection is surely prevented.

FIG. 7 is an exploded perspective view showing another example of the seismoscope according to the present invention.

In the above embodiment, the annular convex portion 21a is integrally provided on the lower surface of the mover 21, but as shown in FIG. 7, the annular convex portion 21a and the mover 21 are formed separately. hand,
It goes without saying that these may be connected to each other.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a seismoscope according to an embodiment of the present invention, FIG. 2 is a top view of the essential parts of the seismoscope, and FIG. 4 is a vertical cross-sectional view of the seismo-sensitive device in an inclined mounting state, FIG. 5 is a schematic plan view for explaining wiring of the seismic-sensitive device, and FIG. 6 is a schematic side view thereof. FIG. 7 is an exploded perspective view showing another example of the seismoscope according to the present invention, FIG. 8 is a schematic sectional view for explaining the seismic movement of the seismoscope, and FIG. 9 is a conventional sectional view. FIG. 10 is a vertical sectional view showing an example of a seismic sensor, FIG. 10 is a schematic sectional view for explaining seismic motion of a conventional seismic sensor, and FIG. 11 is another example of the conventional seismic sensor. FIG. 1 ... Mounting device, 7 ... Vibration case, 9 ... Movable holder, 9a ... Round recess, 10 ... Insulating base, 12 ... Sphere receiving surface,
13 ... Sphere, 16 ... Suspended shaft, 21 ... Mover, 22 ...
… Movable contact piece, 25 …… Switch part, 26,27 …… Switch terminal, 28,30 …… Lead wire, 29,31 …… External terminal, 32,33
…… Movable side protrusion, 34,35 …… Fixed side protrusion, Q …… Swing center, a …… Vertical line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Tanaka, No. 10, Hanazono Tudodo-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture Tateishi Electric Co., Ltd. (56) Reference JP-A-63-29286 (JP, A) JP-A-SHO 63-263423 (JP, A) Actually opened 61-48325 (JP, U) Actually opened 62-193529 (JP, U)

Claims (3)

[Claims] 1. A mounting body, a vibration-sensing case suspended on the mounting body by means of a suspension shaft, and a ball receiving member formed on the inner surface of the bottom wall of the vibration-sensing case. Surface, a sphere rotatably mounted on the sphere receiving surface, a mover holder provided on the upper part of the seismic case, and a shaker of the seismic case formed on the upper surface of the mover holder. An annular recess that is almost concentric with the vertical line that passes through the center of motion, a mover that is vertically movable into this recess, an insulating base that is fixed to the top of this mover holder, and a mover that is movable to the mover. And a switch unit which is set on the insulating base with the contact pieces facing each other,
A seismoscope characterized in that the movable element is displaced upward by the contact based on the rolling movement of the sphere to open and close the switch section. 2. A pair of external terminals are provided on an attachment body composed of an external container, and a pair of switch terminals for taking out a signal of a switch portion are provided on the seismic case, and connecting portions of lead wires to the terminals are provided. The seismoscope according to claim 1, wherein the seismoscope is arranged in substantially the same horizontal plane. 3. The switch terminals and the external terminals are arranged substantially in a point-symmetrical position with respect to each other with the suspension part of the seismic case being sandwiched therebetween, and the switch terminals and the external terminals are located in the vicinity of the switch terminals to the seismic case. A movable side protrusion for winding the lead wire is provided, a fixed side protrusion for winding the lead wire is provided on the mounting body near the external terminal, and one end of each lead wire is used as the movable side protrusion. 3. The seismoscope according to claim 2, wherein the seismoscope is connected to the switch terminal in a wound state, and is connected to the external terminal in a state in which the other end is wound around the fixed side protrusion.