JPH0452522A - Quake-sensitive device - Google Patents

Abstract

PURPOSE:To make a device small in size and to improve reliability by a construction wherein a quake-sensitive ball comes into contact with and pushes up small balls for operating contact pieces when the quake-sensitive ball rolls, and thereby movable contact pieces of a lower-side electrode piece are pushed up and brought into contact with an upper-side electrode piece. CONSTITUTION:A quake-sensitive ball 1 is positioned in a recessed part 5 formed in the central part of the inner bottom of an inside casing 3 and also it is put in a state of being in proximity to and separation from each of small balls 7 for operating contact pieces. When the casing 3 quakes due to an earthquake or the like, the quake- sensitive ball 1 is made to roll inside the casing 3. With this rolling, the quake-sensitive ball 1 comes into contact with the small ball 7 at a position corresponding thereto and pushes it up. By the rising action of the small ball 7, a movable contact piece 8b of a lower-side electrode piece 8 is pushed up and brought into contact with an upper-side electrode piece 9. Thereby a switch 10 is put in a closed state and the quake is detected. The device can be fitted to a printed circuit board easily and reliably by inserting leg parts 4c of an outside casing 4 into the corresponding hole parts of the board. Besides, the switch 10 can be connected to a circuit of the board without lead wires by connection terminals 18 provided in the lower end of this casing.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention is applied to various equipment and devices such as gas meters, kerosene stoves, elevators, chemical plants, railways, etc. for the purpose of detecting seismic motion and preventing various disasters. Regarding the attached seismic device.

2. Description of the Related Art Conventionally, as this type of seismic sensing device, for example,
As shown in Japanese Patent No. 8325, etc., there is a known device that uses a vibration-sensing ball in the vibration-sensing mechanism.

In such a conventional vibration-sensing mechanism, a vibration-sensing ball is housed in a casing with an inverted conical shape with a gentle inner bottom surface, and a concave spherical surface with a larger radius of curvature than that of the vibration-sensing ball is placed on the upper side of the casing on the lower surface side. A plunger having a disc-shaped portion formed in the shape of a disk is disposed so as to be movable up and down with the concave spherical surface in contact with the impression sphere, and a shaft portion protruding from the center of the upper end of the plunger. The tip of the other end of the pressing plate, one end of which is pivotally connected, is brought into contact with the pressing plate, and the tip of the operating lever of the opening/closing switch is elastically contacted with the upper surface of the intermediate portion of the pressing plate in a downwardly biased state. .

As the seismic ball rolls in the casing due to the vibration, the core ball pushes up the concave spherical surface of the plunger, causing the upper end shaft of the plunger to push up the pressing plate, and Accordingly, the actuating lever is pushed up and the contacts of the open/close switch are closed.

Problems to be Solved by the Invention However, as described above, in this type of conventional vibration sensing device, the plunger is disposed in constant contact with the vibration sensing bulb, and the upper end shaft of the plunger is in contact with the upper part of the casing. The structure is such that the plunger is inserted into the shaft hole of the lid covered by the lid, and the plunger is pressed by a pressure plate. Therefore, in order to reliably operate the open/close switch in the event of vibration, the plunger and the seismic ball must be connected. The plunger must be moved up and down by overcoming the frictional force, the frictional force between the shaft of the plunger and the shaft hole into which it is inserted, the gravity of the plunger, the biasing force of the pressing plate, etc. Therefore, it is necessary to use a large-sized earthquake-sensing ball, which poses a problem in that the earthquake-sensing device itself becomes large.

In addition, when the seismic ball makes accurate linear reciprocating motion within the casing, the necessary pulse signal is generated and it is possible to detect an earthquake, but when it makes circular motion etc., the on/off switch is closed during that time. Since the closed state is maintained, it is difficult to obtain the necessary pulse signals and it is difficult to accurately determine an earthquake.

This invention was made in order to solve the above-mentioned problems, and aims to provide a seismic sensing device that can be miniaturized and yet has excellent high performance and high reliability. .

As a means to solve the problem, the inventors have conducted extensive research and experimentation, and as a result, they have developed a method that uses a conventional switch mechanism to achieve further miniaturization and improved reliability. They came to realize that it was difficult to achieve this goal, and through repeated research and experiments, they were able to complete this invention.

That is, - in the seismic device according to the present invention, a seismic ball is housed in a casing so as to be freely rollable, and a switch section is provided above the seismic ball to open and close as the ball rolls. In the seismic sensing device, the switch section includes a lower electrode piece having an even number of movable contact pieces extending radially at equal angles to each other, and an upper electrode piece arranged close to and spaced above the lower electrode piece. an open/close switch consisting of an open/close switch, which is disposed so as to be movable up and down between each of the movable contact pieces and the seismic bulb, and which is brought into contact with the nuclear bulb when the seismic bulb rolls, causing the movable contact piece to connect to the upper electrode piece. A small ball for actuating the contact piece is operated to push up the contact piece so as to bring it into contact with the contact piece.

In order to enable the vibration sensing device to be directly attached to the printed circuit board, legs may be provided at the lower end of the outer casing to project downward. Further, in order to omit a lead wire connecting the open/close switch and the circuit of the printed circuit board, a connecting terminal electrically connected to the open/close switch may be provided at the lower end of the outer casing in a downwardly protruding manner.

The seismic ball housed in the working casing is normally located at the center of the inner bottom surface of the casing, and is placed in close proximity to and separated from each of the small balls for actuating the contact piece. In this state, when the casing vibrates due to an earthquake, etc., the seismic ball rolls within the casing, and as it rolls, the seismic ball contacts the contact piece operating small ball at the corresponding position and pushes it up. .

This upward movement of the small ball pushes up the movable contact piece of the lower electrode piece, and when the movable contact piece comes into contact with the upper electrode piece, the open/close switch is closed, and vibrations are detected.

By inserting the downwardly projecting legs at the lower end of the outer casing into the corresponding holes on the printed circuit board, it can be easily and securely attached to the printed circuit board, and can be opened and closed without lead wires using the connection terminals provided at the lower end of the outer casing. The switch can be connected to a printed circuit board circuit.

Embodiments Hereinafter, a seismic sensing device according to the present invention will be explained based on illustrated embodiments.

The vibration sensing device of the embodiment shown in FIGS. 1 and 2 has a vibration sensing bulb (1) housed inside and a switch section (
The inner casing (3) provided with the inner casing (3) is always maintained horizontally within the outer casing (4) and suspended with limited swinging.

The inner casing (3) has a concave portion (
5) is formed and has a diameter of approximately 11.11#Ill+
A seismic ball (1) made of steel or the like is normally housed in a state where it is held on the recess (5). At the inner upper part of the inner casing (3), there is a contact piece actuating small ball receiver (6) whose lower surface side is formed into a concave spherical surface corresponding to the seismic bulb (1), and which is close to the seismic bulb (1). It is fitted in a locked state in a position where it becomes a separated state. As particularly shown in FIGS. 3 and 4, the receiver cover (6) has a total of 6 pieces with a diameter of about 2.6 m arranged at equal intervals along the circumference at positions equidistant from the center of the cover (6).
Holes (6a) of the RTR are drilled through the top and bottom, and as shown in Fig. 1, each of these holes (6a) has a small contact piece actuator made of steel or the like with a diameter of about 2.5 m. A ball (7) is fitted. In this fitted state, each small ball (7
) is held in place by the lower end reduced diameter portion (6b) in a state that projects slightly downward from the lower end opening of each hole (6a), and is movable up and down. A protrusion (6C) for attaching an open/close switch is protruded from the center of the upper surface of the small ball receiving cover (6), and a pair of upper and lower electrode pieces (8) (9) are attached to the protrusion (6c).
An open/close switch (10) consisting of is fixed.

As shown in FIGS. 5(a) and 5(b), this open/close switch (10) has six radially extending from the center part (8a) such that adjacent ones make an angle of approximately 60 degrees to each other. a lower electrode (8) having a movable contact piece (8b) extending therebetween and a narrow pull-out piece (8c) extending therebetween;
A contact piece (9b) and a pull-out piece (9
C) with an upper electrode (9).

The movable contact piece (8b) has a length that can cover the upper part of the corresponding hole (8a) of the small ball receiving cover (6), and the movable contact piece (8b) has a length that can cover the upper part of the corresponding hole (8a) of the small ball receiving cover (6), and both of the adjacent pieces It is necessary that they be in the same phase. The picture electrodes (8) and (9) should have a thickness of 0.03 mm from the viewpoint of electrical properties (low contact resistance), strength (durability), flexibility (flexibility or sensitivity), etc.
An ultra-thin plate material made of a Cu-Be alloy with a thickness of about 1.5 m is preferably punched out into the above shape, gold-plated, and then heat-treated. As shown in FIG. 1, each movable contact piece (8b) is placed on each hole (6a) of the small ball receiving cover (6).
The lower electrode piece (8) is positioned at its center (8a
) is fitted and fixed to the switch mounting protrusion (6C) of the small bulb receiving cover (6), and the upper electrode piece (9) is placed on top of the protrusion (6C) through an insulating washer (11) so as to be close to each other. , each contact piece (9b) is in the same phase as the movable contact piece (8b) of the lower electrode piece (8), and the pull-out pieces (8c) (9c) are fitted and fixed in a state where they are pulled out in opposite directions. There is. In the figure, (9
d) is a contact formed on the movable contact piece (9b).

Here, the seismic ball (1) and the small balls for actuating each contact piece (7) are spaced very close to each other with a distance of about 0.2 m, and the seismic ball (1) is inside the casing (3). When rolling, the earthquake-sensitive ball (1) comes into contact with the small ball (7) at the corresponding position, and the small ball (7) is pushed up. This pushed-up small ball (7) pushes up the corresponding movable contact piece (8b) of the lower electrode piece (8), so that the contact piece (8b) moves to the upper electrode piece (8).
9) is contacted with the corresponding contact piece (9b). When the vibration stops and the seismic ball (1) finishes rolling, the seismic ball (1)
, the small ball (7) and the movable contact piece (8b) each return to their original positions to prepare for the detection of the next vibration. In order to accurately detect vibrations, it is desirable that the seismic ball (1) reliably move back and forth in a straight line in response to the vibrations within the casing (3). In order to achieve such reliable and accurate linear movement, in this embodiment, a specially shaped recess (5) is formed on the inner bottom surface of the casing (3). That is, as shown in FIGS. 6 and 7, a recess (5a) is formed in the center, and the tops of the recess (5a) form an angle of about 30 degrees between adjacent recesses (5a). A total of 12 protrusions (5b) each having a triangular cross-section with an angle of about 140 degrees are formed radially. The above recess (5a)
The diameter may be set appropriately depending on the vibration to be detected; for example, in order to detect a vibration of 165 gal, the diameter may be set to about 1°87 mm. In addition, each ridge (5
b) are each set to have a gentle upward slope of about 3 to 4 degrees or less toward the outside. By forming such radial protrusions (5b), the seismic ball (1) can be reciprocated accurately along the protrusions (5b), making it possible to detect vibrations even more accurately. Become. Also, each ridge (
5b) is formed to have a triangular cross section, the seismic ball (1) is brought into point contact with each of the protrusions (5b).

Therefore, it is possible to use a smaller seismic ball (1) than conventional products.

The upper end opening of the inner casing (4) has a lid (12
) are fitted and fixed. At the center of the upper surface of this lid body (12) is a hanging shaft member (13) whose upper end is formed into a hemispherical shape.
is firmly planted in an upwardly protruding manner, and its upper hemispherical part (1
3a) is locked to the periphery of a hole (14a) drilled in the center of the strip material (14) for suspending the inner casing, and the inner casing (3) swings relative to the strip material (14). It is done freely. In place of the above-mentioned strip material (14), a suspension member having a disc shape or other appropriate shape may be used.

On the other hand, as shown in FIGS. 1 and 2, the outer casing (4) is formed into a size that allows the inner casing (3) to swing freely, and has an opening at its upper end. is closed by a lid (15). A step (4a) is formed on the inner edge of the upper end of the casing (4), and both ends of the strip material (14) that suspends the inner casing (3) are engaged with the step (4a). By being stopped, the inner casing (3) is suspended in a swingable manner while always maintaining a horizontal state even when the outer casing (4) is set to be tilted. In this suspended state, the concave spherical bottom of the outer casing (4) is designed to transmit vibrations of the outer casing (4) to the inner casing (3) and to prevent the inner casing (3) from swinging due to inertial force. A small amount of high viscosity fluid (16) is filled between the inner casing (3) and the bottom of the inner casing (3). As this high viscosity fluid (16), the inner casing (3)
It is necessary to meet various conditions such as keeping the scales horizontal at all times, being able to efficiently transmit vibrations, ensuring that performance does not deteriorate over a long period of time, and that there is no risk of oil leakage. For example, silicone oil with a viscosity of about 10,000 (cP) (Shin-Etsu Chemical Co., Ltd., trade name rK F-96H)
J, etc.) are preferably used. In addition, the above-mentioned high viscosity fluid (1
In place of or in addition to 6), the above strip material (14)
A swing regulating member such as a conical spring that does not inhibit the alignment action may be interposed between the cover body (12) and the cover body (12).

In addition, the outer casing (4) has bulges (4b
) or are provided integrally.

Legs (4c) for inserting and fixing to the printed circuit board (P) on the mounting side are integrally extended at the lower ends of the pair of opposing bulges (4b) (4b). Conductive terminal bars (17) (17) are press-fitted into the other pair of bulges (4b) (4b), respectively, in a buried state, and the upper ends of the terminal bars (17) (17) are inserted inside. The pull-out pieces (8c) (9c) of the open/close switch (10) pulled out from the casing (3) are connected by rivets, and there is an inverted-shaped terminal plate (18) at the lower end.
(18) is fixed in a downwardly protruding manner, so that it can be directly attached to the mounting side printed circuit board (P) without a lead wire. As a result, the soldering work for joining lead wires, which is required in conventional products, can be omitted, thereby reducing manufacturing costs and electrical resistance.

Note that in the above embodiment, a lower electrode piece having six movable contact pieces extending radially is used, and an upper electrode piece having six corresponding contact pieces is used. However, the present invention is not limited to this, and a lower electrode piece having more movable contact pieces may be used, and an upper electrode piece that does not have a radial contact piece, for example, a disc-shaped one, may be used. It is also permissible to use the following. In short, a seismic ball is housed in a casing so as to be able to roll freely, and a lower electrode piece having an even number of movable contact pieces extending radially at equal angles to each other is attached to the upper part of the seismic ball. An opening/closing switch consisting of upper electrode pieces arranged close to and apart from each other is disposed on the top thereof, and is provided between each of the movable contact pieces and the seismic ball to come into contact with the core ball when the seismic ball rolls. Any other design change as long as the small ball for movable contact piece is arranged to be movable up and down and is pushed up to bring the movable contact piece into contact with the upper electrode piece. It also allows for

Effects of the Invention As described above, in the seismic device according to the present invention, the movable contact piece is formed between each movable contact piece and the seismic ball by being brought into contact with and pushed up by the core ball when the seismic ball rolls. Since the small ball for moving the contact piece, which brings the piece into contact with the upper electrode piece, is arranged to be able to move up and down, the frictional resistance between the vibration sensing ball and the small ball for moving the contact piece is extremely low during vibrations. Point contact is made. Moreover, a small ball is used as a member for transmitting the vibration of the seismic ball to a movable contact piece, and an electrode piece having a radially extending movable contact piece is used as an open/close switch operated by the small ball. Therefore, it is possible to accurately detect even the slightest vibration of the seismic bulb, and it is possible to use a much smaller seismic bulb than conventional products, which in turn makes it possible to downsize the entire seismic device. .

In addition, the opening/closing device is composed of a lower electrode piece having an even number of movable contact pieces extending radially at equal angles to each other on the upper part of the seismic bulb, and an upper electrode piece placed close to and spaced above the lower electrode piece. Since a switch is disposed and a small contact piece actuating ball is disposed between each of the movable contact pieces and the seismic bulb so as to be able to move up and down, the seismic bulb will not move at any time within the casing. Not only is it possible to accurately detect vibrations even when the vibration is reciprocated in the direction of You can definitely get it. Therefore, inconveniences such as erroneous earthquake determination can be avoided, and reliability can be further improved.

Further, as described in claim (2), a leg portion for fixing the casing to a printed circuit board and a connecting terminal electrically connected to the pull-out piece of the open/close switch are provided at the lower end of the outer casing. By providing them in a downwardly protruding shape, they can be directly attached to a printed circuit board, and lead wires can be omitted.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a perspective view showing each component in an exploded state, and FIG. 3 is a small ball receiver for actuating the contact piece. A plan view of the lid, Fig. 4 is a sectional view taken along the line IV-TV in Fig. 3, Figs. The plan view and FIG. 7 are sectional views taken along the line ■--■ in FIG. 6. (1)...Seismic ball, (3)...(inner) casing, (4)...outer casing, (4c)...legs,
(7)...Small ball for contact piece operation, (8)...Lower electrode piece, (8b)...Movable contact piece, (9)...Upper electrode piece,
(10)... Open/close switch, (18)... Connection terminal, (P)... Printed circuit board. Above Figure 1 Figure 2 Figure 6 Figure 7

Claims (2)

[Claims] (1) A seismic ball (1) is housed in a casing (3) so as to be able to roll freely, and a switch part (2) is provided above the seismic ball (1) and is opened and closed as the ball rolls. In the seismic sensing device, the switch part (2) comprises a lower electrode piece (8) having an even number of movable contact pieces (8b) extending radially at equal angles to each other and an upper part thereof. An open/close switch (1) consisting of an upper electrode piece (9) arranged close to and separated from the
0), each movable contact piece (8b) and the seismic ball (1) are arranged so as to be movable up and down, respectively, and the seismic ball (1)
When the ball (1) rolls, the movable contact piece (8b
2. A seismic sensing device characterized in that it is constituted by a contact piece actuating small ball (7) that is pushed up so as to bring the upper electrode piece (9) into contact with the upper electrode piece (9). (2) An inner casing in which a seismic ball (1) is housed so as to be able to roll freely, and a switch part (2) that is opened and closed by the rolling of the seismic ball (1) is provided on the top of the seismic ball (1). (3) is a vibration sensing device that is swingably suspended in an outer casing (4) so as to be held in a horizontal state, and the switch portions (2) are arranged at equal angles to each other. An open/close switch (1) consisting of a lower electrode piece (8) having an even number of movable contact pieces (8b) extending radially and an upper electrode piece (9) arranged close to and spaced above the lower electrode piece (8).
0), each movable contact piece (8b) and the seismic ball (1) are arranged so as to be movable up and down, respectively, and the seismic ball (1)
When the ball (1) rolls, the movable contact piece (8b
) and a small ball (7) for pushing up the outer casing (4) so as to bring it into contact with the upper electrode piece (9). Legs (4c) (4c) for fixing to the substrate (P) and connection terminals (18) (18) electrically connected to the opening/closing switch (2) are provided in a downwardly projecting shape, respectively. A seismic sensing device characterized by: