JP2692220B2 - Seismic sensor with horizontal holding mechanism - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention is configured to open and close a switch part when it is attached to a self-standing device such as a stove and detects a vibration such as an earthquake. More specifically, the present invention relates to a seismoscope equipped with a horizontal holding mechanism that exhibits a predetermined operation characteristic even when mounted in an inclined posture.

[Prior Art and its Problems] As a seismic sensor with a horizontal holding mechanism of this type, as disclosed in, for example, Japanese Utility Model Laid-Open No. 58-36327,
A type having a function of a spirit level for displaying the inclination of the seismoscope when it is attached to a device, for example, JP-A-61-160026
As disclosed in Japanese Patent Publication No. 58-46134 and Japanese Utility Model Publication No. 58-46134, the seismic sensor is floated above the liquid enclosed in the container to automatically maintain the horizontal level regardless of the inclination during installation. It is known to be of the type configured in.

However, in the conventional example having the function of the electronic level, it is necessary to carry out horizontal adjustment when mounting it on the instrument, not only is it troublesome to mount it, but also the level must be in a state where it can be always monitored from the outside. However, there is a drawback that it is difficult to reduce the size because there is a restriction on the place of attachment to the equipment and a size that can be seen is required.

In addition, in the conventional example of automatic horizontal holding type that uses liquid, it is difficult to secure the sealing property of the container that encloses the liquid, and in order to ensure the reliability of operation over a long period of time, welding is performed during the manufacturing process It is necessary to use expensive means such as, and the cost tends to be high. In addition, a flexible connection such as a lead wire is required to take out the signal from the switch of the seismoscope floated on the liquid, and the workability of the entire assembly is poor.

[Object of the Invention] The present invention has been made in order to eliminate the above-mentioned drawbacks, and can improve the assembly workability and the installation workability, can realize the downsizing and the cost reduction, and the mounting place is free, and the rough work can be performed. It is an object of the present invention to provide a seismic sensor with a horizontal holding mechanism that can exhibit stable operating characteristics even when attached to a.

[Structure and Effect of the Invention] In order to achieve the above-mentioned object, a seismoscope with a horizontal holding mechanism according to the present invention includes a sphere and a sphere receiving surface that supports the sphere in a substantially central portion so that the sphere can roll and move. A case, a first support frame that supports the case so as to be swingable around a first support shaft, and a second support frame that is substantially orthogonal to the axis of the first support shaft. The sphere through a second support frame that is swingably supported around a support shaft and is arranged so as to surround the case and the first support frame with a second support frame, and a plunger that comes into contact with the sphere and is displaced. And a vibration detecting means for detecting the rolling movement of the.

According to the above configuration, it is possible to swing the first and second support frames around the first and second support shafts to hold the center of gravity of the case and the sphere on a substantially vertical line, and to attach the device to the device. Even if there is a tilt, the manual horizontal adjustment becomes unnecessary, and the case with the spherical surface is orthogonal to each other.
Since the case and the sphere can be automatically held in a horizontal state by swinging around the second support shaft and the second support shaft, respectively, stable operation characteristics are exhibited even when the case and the sphere are roughly mounted. Therefore, it is possible to improve the workability of attachment to the device, and also to set the attachment place freely and to widen the applicable range.

Also, since no liquid pad is used for horizontal holding,
It does not require high-grade manufacturing processing to secure the sealing property, and does not require a flexible connection for signal extraction.
Not only can the assembling workability be improved and the cost can be reduced, but also the reliability of the operation can be secured for a long period of time.

Further, since the case is supported by the first support frame and the case and the first support frame are surrounded by the second support frame to form a compact horizontal holding mechanism, downsizing of the seismoscope equipped with the horizontal holding mechanism is achieved. The above can be achieved, and visual control is unnecessary.

[Description of Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an example of a seismic sensor with a horizontal holding mechanism according to the present invention. In FIG. 1, 1 is a cylindrical case made of synthetic resin, and the inner surface of its bottom wall 1A is, for example, a spherical surface. The first support shafts 12 and 12 are integrally formed on the outer surface near the upper end and are radially opposed to each other on the outer surface near the upper end. 3 is a steel ball, which is an example of a sphere, and the steel ball 3 is placed on the spherical sphere receiving surface 2 above.
It is supported so as to be able to roll and move in all directions of 0 degree, and is always held in the substantially central portion.

Reference numeral 4 denotes a plunger. The plunger 4 includes, for example, a cylindrical plunger portion 4A and a cylindrical conical portion 4B integrally formed on an upper portion of the cylindrical plunger portion 4A. Steel ball 3 whose peripheral surface is held in the center
It is configured so that it can be abutted on the spherical surface at a predetermined interval so as to be abuttable. 5 is an actuator, and this actuator 5 is the central hole 4C of the cylindrical conical portion 4B of the plunger 4 described above.
A central shaft portion 5A which is press-fitted into and is integrally connected to the plunger 4 by hot caulking, a disk portion 5B which is laterally projected from an upper portion of the central shaft portion 5A, and a lower portion from an outer peripheral portion of the disk portion 5B. It is composed of a vertically extending annular engaging projection 5C and a hemispherical switch operating projection 5D formed at the center of the upper surface of the disk portion 5B.

Reference numeral 6 is a guide member, and a through hole 6A having a diameter larger than the outer diameter of the upper end portion of the cylindrical conical portion 4B of the plunger 4 is provided in the center portion thereof.
Is provided, and a ring-shaped receiving surface 6B for receiving the ring-shaped engaging projection 5C of the actuator 5 is formed so as to open upward in a portion near the central through hole 6A,
In addition, notched grooves 6C for inserting terminals are formed at equal intervals in the circumferential direction in the peripheral portion. By engaging the annular engaging projection 5C of the actuator 5 with the annular receiving surface 6B of the guide member 6, the cylindrical plunger portion 4A of the plunger 4 has an inner peripheral surface thereof with the steel ball. 3 is separated from the steel ball 3 by a predetermined distance, and a spherical surface of the steel ball 3 held in the substantially central portion is cap-fitted so as to wrap around, for example, the upper side.

Reference numeral 7 denotes a base cover, and hanging portions 7A are formed at four locations at equal intervals in the circumferential direction of the base cover, and engaging protrusions 7B are formed on the hanging portions 7A.

Reference numerals 8 and 9 denote a fixed terminal plate and a movable terminal plate, which are inserted into the lower surface of the base cover 7.
Terminals 8A and 9A that pass through the inside of the notched groove 6C of the guide member 6 project downward from each of the guide members 9. A fixed contact 10 is provided at one end of the fixed terminal plate 8, and a movable contact piece 11 which can be opened and closed with respect to the fixed contact 10 is connected to the movable terminal plate 9 by caulking. The hemispherical switch operating projection 5D of the actuator 5 is in contact with the middle portion of the lower surface of the actuator 11. From the above,
A switch portion that is opened and closed by the actuator 5 is configured.

Reference numeral 13 is a ring-shaped first support frame, and the first support shafts 12 and 1 projecting from the cylindrical case 1 at opposed positions on the inner wall surface thereof.
Engagement grooves 13A, 13A capable of engaging with 2 from above are formed. By engaging the first support shafts 12, 12 with the engagement grooves 13A, 13A, the cylindrical case 1 is removed. Is supported swingably around the first support shafts 12, 12 in the upper part of the second support shafts 12, 12 and the second support shafts 14, 14 orthogonal to the first support shafts 12, 12 are outwardly supported. It is integrally projected toward.

Reference numeral 15 is a cylindrical second support frame, on the inner surface of which a stepped protrusion is formed.
16 is integrally formed, and an engaging groove capable of engaging the second support shafts 14 and 14 from above at a location facing the upper edge of the step-like protrusion 16
15A, 15A are formed, and by engaging the second support shafts 14, 14 with the engagement grooves 15A, 15A, the first support frame 13 and the cylindrical case 1 are moved to the second support shaft 14 , 14 is swingably supported. In addition, the base cover 7 is provided near the upper end of the second support frame 15 to support the second support frame 15.
When fitted from above, the engaging convex portion 7B is formed with an engaging concave portion 15B that elastically engages, and through the elastic engagement between the engaging convex portion 7B and the engaging concave portion 15B. By fixing the second support frame 15 and the base cover 7 to each other, an outer case for incorporating other components is configured.

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

FIG. 2 shows a neutral state in which the seismoscope is horizontally attached to an apparatus such as a stove (not shown). In this state, the center of the plunger 4 and the ball center of the steel ball 3 have the same vertical line a. -A, and the surface of the steel ball 3 is in point contact with the lowest part of the spherical spherical surface 2 on this vertical line aa.

In the above state, when vibration exceeds a certain level due to an earthquake or the like, the first supporting frame 13, the second supporting frame 15 and the case 1 vibrate, and the steel ball 3 also vibrates. Since the receiving surface 2 of 3 is spherical, the vibration amount of the steel ball 3 is smaller than the vibration amounts of the first support frame 13, the second support frame 15 and the case 1, and the steel ball is kept until the vibration exceeds a predetermined value. 3 does not contact the cylindrical plunger portion 4A of the plunger 4.

Then, when the vibration exceeds a predetermined value, the steel ball 3 rolls on the spherical spherical surface 2 at a certain speed and collides against the cylindrical plunger portion 4A of the plunger 4, and the impact force causes the plunger 4 to move. As shown in FIG. 3, the actuator 5 which is integral with the plunger 4 swings about a local portion of the annular engaging projection 5C as a fulcrum R. Due to the swinging movement of the plunger 4, the hemispherical switch actuating projection 5D of the actuator 5 pushes the movable contact piece 11 upward, and the movable contact piece 11 abuts the fixed contact 10 to close the switch portion. It That is, the seismic shock absorber operates.
In this embodiment, since the plunger 4 is not affected by the sliding resistance, it is possible to obtain a very sensitive operating characteristic and to ensure the return.

In addition, as shown in FIG. 4, the second support frame 15 has a horizontal surface H.
The first support frame 13 swings around the second support shaft 14 and the case 1 swings around the first support shaft 12 when attached to the device in a state of being inclined with respect to Therefore, the case 1 and the steel ball 3 automatically maintain the horizontal state. Therefore, even if the device is installed roughly and inclined, the speed and impact force required to operate the plunger 4 are not exceeded, and the operating characteristics of the seismic sensitive device are hardly affected. Then, when vibration above a certain level is applied in such an inclined mounting state, as in the case of the horizontal mounting state,
The steel ball 3 rolls on the spherical ball receiving surface 2 at a certain speed and collides with the cylindrical plunger portion 4A of the plunger 4, and the impact force causes the plunger 4 to move to the actuator 5 described above.
With the local portion of the annular engaging projection 5C at the fulcrum R as a fulcrum, the oscillating motion is performed as in the horizontal mounting. Therefore, no strict levelness is required for mounting on the instrument, and the mounting is very simple.

Further, the case 1 is supported by the first support frame 13, and the case 1 and the first support frame 13 are surrounded by the second support frame 15 to form a compact horizontal holding mechanism. The seismic device can be downsized, and visual management is unnecessary.

As shown in FIGS. 2 to 4,
The projection 16 is projected from the lower surface of the bottom wall portion 1A of the case 1, and a circular groove 17 is formed on the inner surface of the bottom wall of the second support frame 15 corresponding to the projection 16 to form the case 1 and the second support frame 15 By configuring so as to limit the inclination angle between the and, it is possible to prevent an unexpected malfunction during installation in the inclined state.

In addition, if the natural vibration cycle around the first support shaft 12 and the second support shaft 14 is brought close to the vibration cycle applied from the outside of the second support frame 15, or the natural vibration cycle is increased. It is possible to reduce the amplitude due to external vibration on the lower surface of the second support frame 15, increase the natural vibration frequency of only the vibration-sensing portion, and eliminate the need for a buffer damper using viscous fluid or the like.

Further, the annular engagement portion 5C of the actuator 5 is shown as the engagement protrusion in the above embodiment, but may be formed in the engagement recess.

[Brief description of the drawings]

FIGS. 1 and 2 show an example of a seismoscope according to the present invention. FIG. 1 is an exploded perspective view of the whole, FIG. 2 is a longitudinal sectional view in an assembled state, FIGS. 3 and 4 Each of the drawings is a vertical cross-sectional view for explaining the operation. 1 ... Case, 2 ... Sphere receiving surface, 3 ... Steel ball, 4 ... Plunger, 5 ... Actuator, 6 ... Guide member, 8, 9 ... Terminal plate, 10 ... Fixed contact, 11 ... Movable contact piece, 12 ... First Support shaft, 13 ... first support frame, 14 ... second support shaft, 15 ... second support frame.

Claims (1)

(57) [Claims] 1. A sphere, a case having at its bottom a sphere receiving surface that supports the sphere in a substantially central portion so that the sphere can roll and move, and a first support for swingably supporting the case around a first support shaft.
A support frame and the first support frame are swingably supported around a second support shaft that is substantially orthogonal to the axis of the first support shaft, and the case and the first support frame are second supported. The first support frame and the second support frame are provided with a second support frame surrounded by a frame and vibration detection means for detecting rolling movement of the sphere through a plunger that comes into contact with the sphere and is displaced. Is swung around the first and second support shafts to maintain the center of gravity of the case and the sphere on a substantially vertical line, and the sphere rolls on the sphere receiving surface of the case to move the plunger. A vibration sensor with a horizontal holding mechanism, which is configured to be displaced, and the displacement of the plunger is detected by the vibration detecting means to detect a vibration of a predetermined value or more.