JP2001165762A - Quake sensing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quake sensing apparatus which has no need of a viscous fluid and a simple structure. SOLUTION: In the quake sensing apparatus having an inner casing 3 swingably hung by a hanging shaft with an earthquake detecting mechanism housed in this casing, the hanging shaft 22 has a shaft part 22a and an engaging part 22b formed in an inflated shape at the lower end of the shaft part 22a with a ball hole 23 bored into the lower end face, a ball 24 and a spring 25 pressing the ball 24 toward the opening of the ball hole 23 are provided in the ball hole 23, the shaft part 22a is loosely inserted into an insert hole 21a of a cover 21 with the engaging part 22b engaged with the lower end edge of the insert hole 21a, and the ball 24 is pressed to the cover 12 provided at the top end of the inner casing by the elastic force of the spring 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic sensor mounted on various devices and devices such as gas meters, oil heaters, elevators, chemical plants, railways, etc. for the purpose of detecting seismic motion and preventing various disasters. Related to the device.

[0002]

2. Description of the Related Art
As a seismic device of this type, as shown in Japanese Utility Model Publication No. 6-7332, a seismic device having a seismic motion detection mechanism is swingably suspended by a suspension shaft. A cylindrical member having an upper end opening is provided at the center of the upper end of the seismic sensor main body, and a lid having a suspension shaft insertion hole at the center is fitted and fixed to the upper end opening, and the cylindrical member and While the space surrounded by the lid is filled with a viscous fluid, the suspension shaft has a locking portion having at least an upper half formed into a spherical bulge at a lower end of a shaft portion, and a lateral portion formed at a lower portion thereof. An extended wing portion is known in which a shaft portion is loosely inserted into the insertion hole and a locking portion is locked to a lower edge of the insertion hole.

[0003] According to this seismic device, the seismic sensor body having the seismic motion detection mechanism is swingably hung by the suspension shaft, so that even when the seismic sensor body is mounted in a slightly inclined state, the seismic sensor main body is always kept. It is held vertically. The wing provided at the lower end of the suspension shaft is disposed facing a viscous fluid filled in a space surrounded by the cylindrical member of the seismic sensor main body and the lid closing the upper end opening. Therefore, while the tilting of the seismic sensor main body is permitted under the regulation condition, the seismic motion is transmitted to the seismic sensor main body accurately.

However, in the above-described seismic device, a viscous fluid must be separately prepared, and a space for filling the viscous fluid is required in order to effectively operate the seismic sensor body as described above. Must be formed to a certain size, which causes a problem that the size of the seismic sensor body becomes large.
There is also a problem that the viscous fluid filling space must be formed in a highly airtight structure in order to prevent the viscous fluid from leaking out of the viscous fluid filling space.

The present invention has been made in view of the above technical background, and has as its object to provide a seismic device which does not require a viscous fluid and has a simple structure.

[0006]

To achieve the above object, the present invention relates to a seismic device in which a seismic sensor body having an earthquake detecting mechanism is swingably suspended by a suspension shaft,
At the center of the upper end of the seismic device main body, a suspension shaft locking member having a suspension shaft insertion hole formed at the upper end is provided, and the upper end central portion of the seismic device main body is While the suspension shaft is formed in a spherical concave portion centered on the swing center, the suspension shaft,
At the lower end of the shaft portion, at least an upper half is formed in a spherical bulging shape and has a locking portion having a ball hole formed in the lower end surface, and the ball hole has a ball and a ball. A biasing member for biasing in the direction of the opening is provided, a shaft portion is loosely inserted into the insertion hole, a locking portion is locked to a lower end edge of the insertion hole, and the ball is a biasing member. The pressing force is pressed against the spherical concave portion.

According to this, the seismic sensor main body having the seismic motion detection mechanism is swingably hung by the suspension shaft, so that the seismic sensor main body is always in a vertical state even when mounted in a slightly inclined state. Will be retained. In addition, the biasing force of the biasing member pushes the ball against the seismic sensor main body, and an appropriate frictional force is generated at a contact portion between the ball and the seismic sensor main body.
While the tilting of the seismic sensor main body is allowed under the regulated state without using a viscous fluid, the seismic motion is accurately transmitted to the seismic sensor main body.

In addition, a pressing member insertion hole communicating with the ball hole of the locking portion is provided inside the shaft portion of the suspension shaft,
When the urging member is compressed by the pressing member inserted vertically movably into the pressing member insertion hole, it is possible to prevent the ball from being flipped by the urging member when attaching the suspension shaft to a predetermined position. The work of attaching the suspension shaft to the seismic sensor body becomes easy. Further, by changing the pressing amount of the pressing member up and down, the frictional force at the contact portion between the ball and the seismic sensor main body can be easily and reliably adjusted. Further, by examining the degree of rebound from the biasing member when the pressing member is inserted into the suspension shaft, the presence or absence of the biasing member in the suspension shaft can be confirmed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the seismic device according to the present invention is applied to a gas meter seismic device will be described below.

The seismic device of the embodiment shown in FIGS.
An inner casing (3) provided with a switch (2) at the top while the seismic ball (1) is housed therein is always kept horizontal in the outer casing (4), and swinging is limited. It is hung in the state where it was carried out.

The inner casing (3) has a recess (5) formed at the center of the inner bottom surface and has a diameter of about 11.1.
A 1 mm steel seismic ball (1) made of steel or the like is normally housed while being held on the recess (5). The concave portion (5) has a concave portion (5a) at the center as shown in FIG.
Are formed, and a total of 12 ridges (5b) having a triangular cross section whose apex angle is set to about 140 degrees so that adjacent ones from the recess (5a) form an angle of about 30 degrees are radially formed. Is formed. The diameter of the recess (5a) may be appropriately set according to the vibration to be detected.
In order to detect a vibration of 5 gal, the diameter is 1.87 mm
It should just be set to about. Each ridge (5b) is set to have a gentle upward slope of about 3 to 4 degrees or less toward the outside. Such radial ridges (5b)
Is formed so that the seismic sphere (1) has the convex shape (5).
The reciprocating operation is performed accurately along b), and the vibration can be detected more accurately. In addition, each ridge (5b)
Is formed into a triangular cross section, so that the seismic sphere (1)
Is in point contact with each ridge (5b),
It is possible to adopt a ball smaller than the conventional product as the seismic ball (1).

A small ball receiver (6), whose lower surface is formed as a concave spherical surface corresponding to the seismic sphere (1), is provided on the inner upper part of the inner casing (3) at a distance from the seismic sphere (1). It is fitted in a state where it is locked at a position where it will be in a state. As shown in FIGS. 4 and 5 in particular, the small ball receiver (6) has a total of six holes having a diameter of about 2.6 mm at regular intervals along the circumferential direction at positions equidistant from the center thereof. (6a) is drilled in a vertically penetrating state, and as shown in FIG. 1, a small ball (7) for operating a contact piece made of steel or the like having a diameter of 2.5 mm is fitted into each of the holes (6a). Have been. In this fitted state, each small ball (7) is locked and held by the reduced diameter portion (6b) at the lower end while slightly projecting below the lower opening of each hole (6a), and can be moved up and down. ing. An opening / closing switch mounting projection (6c) is provided at the center of the upper surface of the small ball receiver (6), and the opening / closing switch includes a pair of upper and lower electrode pieces (8) and (9). (10) is fixed.

This open / close switch (10) is shown in FIG.
As shown in (b), six movable pieces (8b) are radially extended from the central portion (8a) so that adjacent ones form an angle of 60 degrees with each other, and one movable piece (8b) extends from between them.
An upper electrode piece (9) having a lower electrode piece (8) having a plurality of narrow width drawing pieces (8c) extended therefrom, and a contact piece (9b) and a drawing piece (9c) having shapes substantially corresponding thereto. It is composed of The movable contact piece (8b) includes the small ball receiver (6).
It is necessary to have a length that can cover the upper part of the corresponding hole (6a), and that adjacent ones have the same phase as the hole (6a). The two electrode pieces (8)
As (9), from the viewpoints of electrical characteristics (low contact resistance), strength (durability), flexibility (flexibility or sensitivity) and the like, a Cu-Be alloy ultra-thin sheet material having a thickness of about 0.03 mm is used. After punching in the above shape and applying gold plating, a material subjected to heat treatment is preferably used. Thus, as shown in FIG.
The lower electrode piece (8) is positioned at the center (8a) of the small ball receiver (6) such that each movable contact piece (8b) is located on each hole (6a) of the small ball receiver (6). ) Switch mounting projections (6
c), and is fitted and fixed on the upper part with an insulating washer (1).
The upper electrode piece (9) is connected to the movable contact piece (8) of the lower electrode piece (8) so that the upper electrode piece (9) is in the proximity and separated state via 1).
It is fitted and fixed in the same phase as in b) and with the drawer pieces pulled out in opposite directions. In the drawing, (9d) is a contact formed on the movable contact piece (9b).

Here, the seismic sphere (1) and each of the small balls (7) are in a very close distance of about 0.2 mm, and the seismic sphere (1) rolls in the casing. At this time, the seismic sphere (1) comes into contact with the small ball (7) at the corresponding position, and the small ball (7) is pushed up. The pushed small ball (7) pushes up the corresponding movable contact piece (8b) of the lower electrode piece (8), and the movable contact piece (8b) pushes the corresponding contact piece of the upper electrode piece (9). Touch the piece (9b). When the shaking disappears and the rolling of the seismic ball (1) ends, the seismic ball (1)
The small ball (7) and the movable contact piece (8b) return to their original positions, respectively, and prepare for the detection of the next vibration.

A lid (12) is fitted and fixed to the upper end opening of the inner casing (3). This lid (1
In the center of the upper surface of 2), a cylindrical member (2
0) is formed, and a lid (21) of a corresponding shape is forcibly fitted to the upper end opening. The lid (1
The center of the upper surface of 2) is formed in a spherical concave portion (26) centered on the swing center of the inner casing (3). The inner casing (3) has an inner casing strip (14) having both ends locked in the outer casing (4).
And a suspension shaft (22) attached to a longitudinally intermediate portion thereof in a protruding downward shape, and is suspended and fixed in the outer casing (4).

As shown in FIG. 2, the suspension shaft (22) has a shaft portion (22a) having an upper end fixed to the inner casing strip (14), and an upper portion at the lower end of the shaft portion (22a). Is formed in a bulged spherical shape and has a locking portion (22b) having a ball hole (23) formed in the lower end surface thereof. The ball (24) is provided in the ball hole (23). 24)
And a spring (25) for urging the spring toward the opening of the ball hole (23). And the shaft part (22a)
Is loosely inserted into the insertion hole (21a) formed in the center of the lid (21), and the lower end edge of the insertion hole (21a) is locked by the locking portion (22b). The ball (24) is pressed against the spherical concave portion (12) of the lid (12) in a state where a part of the ball (24) projects downward by the urging force of the spring (25).

According to this suspension structure, the inner casing (3) is always swingably hung by the suspension shaft (22), so that even if the inner casing (3) is mounted in a slightly inclined state, the inner casing (3) is always kept. It is held vertically. The ball (24) is pressed against the lid (12) by the urging force of the spring (25), so that the ball (2) is pressed.
4) Since an appropriate frictional force is generated at the contact point (B) between the lid (12) and the lid (12), the tilting of the inner casing (3) is allowed under the regulated state without using a viscous fluid,
The seismic motion is accurately transmitted to the inner casing (3). As described above, the central portion of the upper end of the lid portion (12) is formed in the spherical concave portion (26) centered on the swing center (A) of the inner casing (3), so that the inner casing (3) is formed. In both the inclined state and the vertical state, the distance from the swing center (A) to the contact point (B) of the ball (24) is always constant, so that the inner casing (3) moves from the inclined state. The transition to the vertical state can be smoothly performed.

On the other hand, as shown in FIGS. 1 and 2, the outer casing (4) has the inner casing (3) inside.
Is formed in such a size as to be swingably accommodated, and its upper end opening is closed by a lid (15). A step (4) is provided at the upper inner edge of the outer casing (4).
a) is formed, and both ends of the inner casing strip (14) are locked to the step (4a).

The outer casing (4) is integrally provided with bulges (4b) extending in the axial direction at four positions on the outer peripheral surface thereof with a phase difference of 90 degrees. At the lower end of the pair of opposing bulges (4b), (4b), an insertion fixing leg (4c) for the printed circuit board on the mounting side is integrally extended. The other pair of bulges (4b) (4
In (b), conductive terminal rods (17) and (17) are press-fitted in a buried state, respectively.
At the upper end of 7), the pull-out pieces (8c) and 9c) of the open / close switch (10) pulled out from the inner casing (3) are connected by riveting, respectively, and at the lower end thereof are inverted L-shaped terminal plates (18) and (9). 18) is fixed in a downward projecting shape.

FIG. 9 shows another embodiment of the present invention.

In this embodiment, an elongated pressing member insertion hole (27) communicating with the ball hole (23) of the locking portion (22b) is provided inside the shaft portion (22a) of the suspension shaft (22). Are formed, and the pressing member (2) is inserted into the pressing member insertion hole (27).
8) is inserted movably up and down. The pressing member (28) is provided with a spring compression disk (28a) at the lower end and a female screw member (28b) at the upper end that can be screwed to the male screw portion (22c) at the upper end of the shaft portion (22). I have. Then, the ball (24) and the spring (2)
5) with the suspension shaft (2) inserted into the ball hole (23).
After arranging 2) at a predetermined location, the pressing member (28) compresses the spring (25) by a predetermined amount,
The pressing member (28) is screwed and fixed to the suspension shaft (22). Note that the same members as those in the above-described embodiment are denoted by the same reference numerals and are omitted.

According to this, when the suspension shaft (22) is attached to a predetermined position, the ball (24) is moved by the spring (25).
Can be prevented from being flipped by the suspension shaft (2
2) Installation work becomes easy. Further, the frictional force at the contact point (B) between the ball (24) and the spherical concave portion (26) can be easily and reliably adjusted by changing the pressing amount of the pressing member (28) by screw adjustment. . Further, by examining the degree of rebound from the spring (25) when the pressing member (28) is inserted into the suspension shaft (22), the presence or absence of the spring (25) in the suspension shaft (22) can be easily determined. You can check.

In each of the above embodiments,
Although the suspension shaft locking member is constituted by the cylindrical member (20) and the lid (21), the invention is not limited to this, and the suspension shaft locking member may be integrally formed. The portion may be changed to a columnar member or the like. In short, the suspension shaft locking member is formed in a mode having a certain space inside at the center of the upper end of the inner casing (3), and the suspension shaft insertion hole is formed at the upper end. I just need.

Further, a spring (25) is used as a biasing member.
Was used, but other urging members may be used as long as they can urge the ball (24).

The present invention is not limited to the seismic device for a gas meter as shown in the above embodiment, but may be used for various devices and devices such as an oil stove, an elevator, a chemical plant, and a railway. It may be suitable for an apparatus.

[0026]

According to the first aspect of the present invention, the seismic sensor main body having the seismic motion detecting mechanism is swingably suspended by the suspension shaft, so that the seismic sensor can be mounted even if it is slightly inclined. The main body can be always maintained in a vertical state. Also,
The biasing force of the biasing member pushes the ball against the seismic sensor main body, and an appropriate frictional force is generated at the contact point between the ball and the seismic sensor main body. While allowed below, seismic motion can be accurately transmitted to the seismic sensor body.

According to the second aspect of the present invention, it is possible to prevent the ball from being flipped by the biasing member when the suspension shaft is attached to a predetermined position, and to attach the suspension shaft to the seismic sensor main body. Work becomes easy. Further, by changing the pressing amount of the pressing member up and down, the frictional force at the contact portion between the ball and the seismic sensor main body can be easily and reliably adjusted. Further, by examining the degree of rebound from the biasing member when the pressing member is inserted into the suspension shaft, the presence or absence of the biasing member in the suspension shaft can be confirmed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a seismic device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an exploded perspective view of the seismic device.

FIG. 4 is a plan view showing the seismic device with an outer lid removed.

FIG. 5 is a sectional view of a small ball receiver.

FIG. 6 is a plan view of an upper electrode piece and a lower electrode piece.

FIG. 7 is a plan view of an inner casing.

FIG. 8 is a sectional view of the inner casing.

FIG. 9 is an enlarged cross-sectional view of a main part of a seismic device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Seismic ball 3 ... Inner casing 4 ... Outer casing 7 ... Small ball 8 ... Lower electrode piece 8b ... Movable contact piece 9 ... Upper electrode piece 12 ... · Lid 14 ··················································································································・ Ball 25 ・ ・ ・ Spring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tokushi Nakagawa 2-10-16 Higashiobashi, Higashinari-ku, Osaka Kansai Gas Meter Co., Ltd. (72) Inventor Akio Takahashi 2206-1 Yoga, Suwa-shi F-term (reference) 2G064 AA11 AB19 BA07 BB11 BB16 BB21 BB40 BB61 DD32

Claims (2)

[Claims] 1. A seismic device in which a seismic sensor main body having an earthquake detecting mechanism is swingably hung by a suspension shaft, wherein a suspending shaft is provided at a central upper end of the seismic sensor main body and at an upper end thereof. A suspension shaft locking member having an insertion hole formed therein is provided, and a center of an upper end of the seismic sensor main body is formed in a spherical concave portion centered on a swing center of the seismic sensor main body; The suspension shaft has a shaft portion, and a locking portion in which at least an upper half is formed in a spherical bulge at a lower end of the shaft portion and a ball hole is formed in a lower end surface. A ball and a biasing member for biasing the ball in the direction of the opening of the ball hole. A shaft portion is loosely inserted into the insertion hole, and a locking portion is locked to a lower edge of the insertion hole. And the ball is pressed against the spherical concave portion by a biasing force of a biasing member. 2. A pressing member insertion hole communicating with the ball hole of the locking portion is formed inside the shaft portion of the suspension shaft, and a pressing member inserted vertically movably into the pressing member insertion hole. The seismic device according to claim 1, wherein the urging member is configured to be compressed.