JP2018091387A - Seismic isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolator which has satisfactory base isolation performance upon earthquake and can mount a loading object stably upon normal time.SOLUTION: A seismic isolator 10 includes a base plate member 11, a loading plate member 12 which is arranged on the base plate member 11 and mounts a loading object thereon, a sliding member or a rolling member 14 which is provided between the base plate member 11 and the loading plate member 12 and can be relatively moved and a plurality of elastic members 13 which are connected between the base plate member 11 and the loading plate member 12, absorb earthquake motion and restore the loading object to a position before earthquake. Therein, a magnetic force motion regulation means 20 which regulates a relative motion of a normal time by a magnetic force and permits the relative motion with respect to the earthquake motion is provided between the base plate member 11 and the loading plate member 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic isolation device.

  Seismic isolation devices are used as a measure against earthquakes, and they are exempt not only for large structures such as buildings, but also for ceramics and art, small and lightweight tabletop equipment, and tropical fish tanks. Seismic devices are also used.

The seismic isolation device for small and lightweight devices is a device that applies the principles of rolling isolation and sliding isolation, and has, for example, a lower substrate and an upper base plate located on this substrate. The spherical rotating body provided on the base plate located in the upper part is brought into contact with the base board located in the lower part and supported rotatably, and the base plate and the base plate are connected by elastic members such as a plurality of coil springs and rubber springs. It is constructed by absorbing the seismic motion and energizing the base plate to return on the substrate.
In such a seismic isolation device, if sufficient seismic isolation effect for seismic motion is to be obtained, relative movement may occur due to the force applied when operating the equipment loaded on the seismic isolation device in normal times, for example. .

  Therefore, although it is for buildings, usually, a seismic isolation assist device has been proposed that can suppress vibration even when the building receives a gust of wind, and can exhibit the seismic isolation effect in the event of an earthquake. (Refer to Patent Document 1), the engagement means is pressed and engaged in a direction to engage with the engaged portion of the engaged means with a predetermined pressing force, so that the movement is restricted, and the engaged When retreating from the means, it is provided so as to be retractable so that it can move during an earthquake, and the retracted engaging means is configured to gradually protrude and return within a predetermined time with respect to the next earthquake. Yes.

JP 11-325178 A

  Such a seismic isolation assist device of Patent Document 1 targets a large structure, suppresses movement even by the force of gusts applied to the structure, and after moving by seismic motion, engages within a predetermined time. There is a problem that the apparatus is configured to be restored, the apparatus is complicated and large, and cannot be applied to a seismic isolation apparatus for small and light loads as it is.

  The present invention has been made in view of the problems in the prior art, and provides a seismic isolation device that is sufficiently seismically isolated during an earthquake and that can stably load a load during normal times. For the purpose.

The seismic isolation device of the present invention that solves the above problems is as follows.
A base plate member;
A loading plate member disposed on the base plate member and on which a load is placed;
A sliding member or a rolling member provided between the base plate member and the load plate member described above and capable of relative movement;
A plurality of elastic members coupled between the base plate member and the load plate member described above to absorb seismic motion and restore the position before the earthquake,
Between the base plate member and the load plate member described above is provided with a magnetic force movement restricting means that restricts relative movement at normal time by magnetic force and enables relative movement against earthquake motion.
It is characterized by that.

  The magnetic force movement restricting means includes a restricting magnetic body portion provided on one of the base plate member and the load plate member, and a restricting magnet provided on either one of the restricting magnetic body portions. It is preferable that it is comprised with a part.

The restricting magnetic body portion is configured to serve also as the sliding member or the rolling member provided on any one of the base plate member and the load plate member described above,
It is preferable that the restriction magnet portion is provided on either the base plate member or the load plate member described above, and is configured in a plurality of columnar shapes or a single plate shape facing the sliding member or the rolling member.

  It is preferable that the restricting magnet portion is configured to be embedded from the front surface side or the back surface side of the base plate member.

  It is preferable that a second base plate member is provided on the surface of the restriction magnet portion embedded from the surface side of the base plate member.

  The elastic member includes the base plate between the first connection point on the center point side of the base plate member or the load plate member and the second connection point on the outer peripheral side of the load plate member or the base plate member. It is preferable that the radial direction centered on the center point of the member or the load plate member and the linear direction connecting the first connection point and the second connection point are shifted and connected. .

  It is preferable that the sliding member or the rolling member is disposed either on the inner side of the first connection point, on a concentric circle of the second connection point, or on the outer side of the second connection point.

  It is preferable that the seismic isolation device is provided as one unit, and that a single load can be placed on the load plate member of the plurality of the units described above.

  According to the seismic isolation device of the present invention, there is sufficient seismic isolation in the event of an earthquake, and the load can be stably placed in a normal state.

1A is a schematic plan view and FIG. 1B is a schematic cross-sectional view according to an embodiment of the seismic isolation device of the present invention. It is a partial expanded sectional view which concerns on other embodiment of the seismic isolation apparatus of this invention, respectively. It is the schematic plan view and schematic sectional drawing which abbreviate | omitted a part of base plate member which concerns on other one Embodiment of the seismic isolation apparatus of this invention. It is the schematic sectional drawing and partial expanded sectional view which concern on one Embodiment of the seismic isolation apparatus of this invention. It is a schematic plan view explaining the arrangement | positioning and operating principle of the elastic member which abbreviate | omitted one part which concerns on one Embodiment of the seismic isolation apparatus of this invention. It is a schematic plan view explaining the arrangement | positioning and operation | movement principle of the elastic member which abbreviate | omitted one part which concerns on one Embodiment of the seismic isolation apparatus of this invention, and a schematic plan view of the prior art example compared. It is a schematic plan view explaining arrangement | positioning and an operation principle of the elastic member which abbreviate | omitted one part which concerns on another one Embodiment of the seismic isolation apparatus of this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
The seismic isolation device 10 of the present invention is a device that is used for seismic isolation of a load such as a small and lightweight device. For example, the weight of the load in one seismic isolation device 10 is 10 kg or less and heavy. However, it is suitable for seismic isolation with a target of 50 kg or less. In addition, by using the seismic isolation device 10 as a single unit in combination with a plurality of units, the seismic isolation device 10 can be used for seismic isolation of a load having a size or weight corresponding to the number of units. In principle, the seismic isolation device of the present invention does not limit the weight of the load.

As shown in FIG. 1, the seismic isolation device 10 is moved on a base plate member 11 placed on a floor surface or a table, and on the base plate member 11 via a sliding member (not shown) or a rolling member 14. A normal load relative to the load plate member 12, the plurality of elastic members 13 connected between the base plate member 11 and the load plate member 12, and the base plate member 11 and the load plate member 12 are provided. Magnetic movement restriction means 20 that restricts movement by magnetic force and enables relative movement with respect to earthquake motion.
The elastic member 13 is composed of, for example, six tension coil springs, and is a first connection point (first connection point) of three elastic members 13 at 120 degree intervals on the center point O side of the base plate member 11. Spring connection points 16 (hereinafter referred to as spring connection points 16) and the spring connection points 16 on the center point O side of the three locations at three locations at 120 ° intervals on the outer peripheral side of the loading plate member 12 shifted by 60 °. The elastic member 13 is connected to a second spring connection point 17 (hereinafter, referred to as a spring connection point 17) that is a connection point (second connection point) of the elastic member 13.
That is, as shown in FIG. 5, each elastic member 13 has a radial direction A passing through the center point O, and a spring connection point 16 on the center point O side to which the one end connection portion 13a of each elastic member 13 is attached and the other end connection. It arrange | positions so that the direction B which connects the spring connection point 17 of the outer peripheral part side to which the part 13b is attached may not correspond. Further, one end connecting portion 13a of two elastic members 13 is connected to each spring connecting point 16, and the two elastic members 13 are equally arranged on both sides of the radial direction A passing through the spring connecting point 16, respectively. Is done.
The spring connecting portion 17 to which the other end connecting portion 13b of the elastic member 13 is connected to the inner peripheral portion of the outer frame portion 12b of the loading plate member 12 is shifted by 60 degrees from the spring connecting portion 16 on the center point O side. Three places are provided at intervals of 120 degrees.

The base plate member 11 of the seismic isolation device 10 is fixedly installed on a floor surface, a table or the like, and includes, for example, a disk-shaped lower plate 11a and a column portion 11b protruding upward concentrically with the center point O. It is prepared for. The column part 11b is provided with three spring connecting parts 16 to which the one end connecting part 13a of the elastic member 13 is connected at intervals of 120 degrees.
On the lower plate 11 a of the base plate member 11, the loading plate member 12 is disposed concentrically with the center point O as the center. The loading plate member 12 includes a disk-shaped loading plate 12a and an outer frame portion 12b protruding downward from the outer peripheral portion of the loading plate 12a. The loading plate 12a has a smaller diameter than the lower plate 11a. The loading plate 12a may be formed to have the same diameter as the lower plate 11a, as long as the loading plate 12a can move relative to the earthquake motion on the lower plate 11a by a desired amount. On the loading plate 12a, a load such as a device is placed.
Two elastic members 13 are provided between the three spring connecting portions 16 on the center point O side and the three spring connecting portions 17 shifted by 60 degrees on the outer peripheral portion side, for a total of six elastic members 13. As described above, the tension coil spring is connected through one end connecting portion 13a and the other end connecting portion 13b.

In the seismic isolation device 10, the sliding member or the rolling member 14 is arranged on the concentric circle of the spring connection point 17 that is the second connection point of the elastic member 13 or on the outer side of the spring connection point 17. Even if the sliding member or the rolling member 14 is arranged on the inner side of the spring coupling point 16 so as to have the same diameter as the loading plate 12a and the lower plate 11a, the sliding plate or the rolling member 14 moves on the lower plate 11a against the earthquake motion. The loading plate 12a is ensured to ensure a desired amount of relative movement.
That is, in the seismic isolation device 10, a plurality of spherical rotating bodies 14 a are provided as rolling members 14 on the lower surface of the outer frame portion 12 b on the concentric circle of the spring connection point 17 of the loading plate member 12. A body 14a is attached via a support frame 14b. The rolling member 14 supports the load loaded on the loading plate 12a in a stable state, and rolls and moves on the lower plate 11a. The number of rolling members 14 is set so that the rolling members 14 move in a stable state and can support a load.
As a result, the loading plate member 12 reaches the support plate 11b on the lower plate 11a until one end of the outer frame portion 12b of the loading plate 12a hits and the other end (the opposite side in the moving direction) is positioned on the lower plate 11a. The range can be moved in a rolling friction state in an arbitrary direction via the spherical rotating body 14a, and so-called rolling seismic isolation is performed.
Further, since the rolling member 14 is provided on the outer frame portion 12b of the loading plate member 12, the loading plate 12a always supports the load in a stable state regardless of the position of the load on the loading plate 12a, and rolls. Can move.

In this embodiment, the lower plate 11a itself of the base plate member 11 is constituted by a member having low friction so that the spherical rotating body 14a can roll more smoothly. In this case, the surface roughness of the low friction member is selected so that the spherical rotating body 14a can roll without slipping.
In addition, in order to reduce friction on the lower plate 11a of the base plate member 11, a disk-like friction reducing member may be separately attached so that the spherical rotating body 14a can smoothly roll.
Further, instead of the rolling member 14, a sliding member may be provided on the lower surface of the outer frame portion 12b to perform so-called sliding seismic isolation. In this case, the outer frame portion 12b itself of the loading plate member 12 may be a low friction material and the lower surface may also be used as a sliding member.

In such a seismic isolation device 10, for example, six elastic members 13 are provided between the base plate member 11 and the loading plate member 12 that can be moved on the base plate member 11 via the rolling member 14. A tension coil spring is connected.
As a result, the loading plate member 12 is held at the center point O of the base plate member 11 by the elastic member 13 constituted by six tension coil springs (statically held), and the energy at the time of earthquake excitation is absorbed, and the response acceleration Reduce.
Further, after the earthquake, the loading plate member 12 is pulled back to the center point O of the base plate member 11 by the elastic member 13 constituted by six tension coil springs (return to the origin).

Further, in this seismic isolation device 10, the one end connecting portion 13 a of the elastic member 13 is shifted from the spring connecting point 16 to the spring connecting point 16 on the center point O side having an interval of 120 degrees at three positions with 120 intervals. The other end connecting portion 13b of the elastic member 13 is connected to the spring connecting point 17 on the outer peripheral side. Thereby, the expansion / contraction direction of the elastic member 13 is a direction B connecting the one end connecting portion 13a and the other end connecting portion 13b, and is shifted from the radial direction A centering on the center point O of the loading plate member 12. is there.
Therefore, the expansion / contraction direction B of each elastic member 13 does not overlap with the radial direction A, and even when the earthquake motion resonates with the natural frequency of the spring of the elastic member 13, it is possible to prevent vibration amplification by the elastic members 13. it can.

Further, the elastic member 13 is expanded and contracted in the direction B connecting the one end connecting portion 13a and the other end connecting portion 13b, and deviating from the radial direction A centering on the center point O of the loading plate member 12. For example, as shown in FIG. 6B, even if the direction D of the earthquake motion coincides with the radial direction of the center point O of the loading plate member 12, the elastic member 13 is prevented from restricting the movable range of the loading plate member 12. Thus, a sufficient movable range (movement range of the loading plate member 12) can be ensured.
Thus, unlike the case where the movable range of the base plate 3 is limited by the elastic body 4 itself due to the arrangement of the conventional elastic body 4 shown in FIG. 6C, when securing the same movable range, The seismic isolation device 10 can be downsized.

  Further, in the seismic isolation device 10, six elastic members 13 are provided on both sides of the radial direction A between the spring connecting portions 16 on the center point O side and the spring connecting portions 17 on the outer peripheral portion side at three locations. As shown in FIG. 6 (b), the loading plate member 12 moves in a straight line in the traveling direction without being twisted by the opposing elastic member 13 (rotation around the vertical axis), as shown in FIG. 12 and the load on the loading plate member 12 can be prevented from rotating. Furthermore, by arranging the elastic members 13 equally on both sides with the radial direction A in between, the load of each elastic member 13 is not concentrated, and there is an effect that damage is suppressed.

Even when the seismic motion resonates with the natural frequency of the spring of the elastic member 13 by shifting the expansion / contraction direction B of the elastic member 13 and the radial direction A of the center point O of the loading plate member 12, It is desirable that the amount of deviation between the expansion / contraction direction B and the radiation direction A is large in order to prevent vibration amplification by the mutual elastic members 13.
That is, as shown in FIG. 5, a direction (also one radial direction A) connecting the center point O of the base plate member 11 and the spring connection point 16 on the center point O side of the elastic member 13, and the expansion and contraction of the elastic member 13. It is desirable that the angle C formed with the direction B is large, and it is desirably 10 degrees or more and 90 degrees or less.
Even in this angle range, it is necessary that the elastic members 13 do not overlap in the expansion / contraction direction B.

In the seismic isolation device 10 configured as described above, the loading plate member 12 can freely move on the base plate member 11 by the input earthquake motion, and the inner periphery of the outer frame portion 12b of the loading plate member 12 mainly by the elastic member 13. Although the urging force is applied to the part side and moves in the direction of pushing or pulling, the probability of overlapping with the expansion / contraction direction B of the elastic member 13 is very small.
Even if the moving direction of the loading plate member 12 (the base plate member 11 relatively moves during an earthquake) may move in the expansion / contraction direction B of one elastic member 13, other elastic members 13 does not overlap with the expansion / contraction direction B, and therefore, when resonating with the natural vibration of the spring, it is possible to suppress the mutual vibration frequency from being canceled and amplifying the vibration.

  Further, in the seismic isolation device 10, since the rolling member 14 is provided on the outer frame portion 12b of the loading plate member 12, the loading plate 12a is always in a stable state regardless of the position of the loaded load on the loading plate 12a. The load can be supported and moved on the lower plate 11 a of the base plate member 11.

  In the above-described embodiment, the base plate member 11 and the loading plate member 12 of the seismic isolation device 10 are configured in a concentric circular shape, and the spring connecting point 16 on the center point O side of the elastic member 13 and the outer peripheral side. The spring connection points 17 are provided at three positions at intervals of 120 degrees, and the spring connection points 16 and the spring connection points 17 are shifted by 60 degrees. However, the present invention is not limited to this, and the expansion and contraction direction B of the elastic member 13 and the base plate member 11 As long as the radial direction A from the center point O is not coincident with the center point O, the loading plate member 12 is moved to the origin (the center of the base plate member 11) by the elastic member 13 with respect to the base plate member 11 in a state where seismic motion or the like is not applied. What is necessary is just to be comprised so that it may rest at the point O).

For example, as shown in FIG. 6A, the seismic isolation device 10 uses three elastic members 13, and in a state where the elastic force by the elastic members 13 does not act (stationary state), the expansion / contraction direction B of the elastic member 13 Are shifted from the radial direction A with respect to the center point O of the base plate member 11, and the three spring connecting portions 16 of the column portions 11 b of the base plate member 11 and the three spring connecting portions 17 of the outer frame portion 12 b of the loading plate member 12. If the space can be connected, a more simplified seismic isolation device 10 can be configured.
Even with such a seismic isolation device 10, in the same way as the seismic isolation device 10 already described, in addition to the attenuation of seismic energy and suppression of resonance, sufficient securing of the movable range of the loading plate member 12, There are effects such as ensuring stable movement. Moreover, when ensuring the same movable range, size reduction of the seismic isolation apparatus 10 can also be achieved.

In such a seismic isolation device 10, the loading plate member 12 is movable on the base plate member 11 via the spherical rotating body 14 a of the rolling member 14, so that the loaded item is placed on the loading plate member 12. If a slight force is applied in a state where it is in a state of being struck, it may vibrate or move even during an earthquake. For example, in the case of the seismic isolation device 10 that uses an office desktop printer as a load, the desktop printer may vibrate due to the force of pulling out the paper feed tray to replenish the printing paper.
Therefore, between the base plate member 11 and the loading plate member 12, there is provided magnetic force movement restricting means 20 that restricts relative movement in the normal state by magnetic force and enables relative movement against earthquake motion.

The magnetic force movement restricting means 20 is for restricting the movement of the restricting magnetic body portion 21 provided on either one of the base plate member 11 and the loading plate member 12 and on the other. It is comprised with the magnet part 22. FIG.
In the present embodiment, the restricting magnetic body portion 21 is configured to serve also as the spherical rotating body 14a of the rolling member 14 provided on the loading plate member 12, and the spherical rotating body 14a is a steel ball. The restricting magnet portion 22 is provided so as to face the spherical rotating body 14a provided on the base plate member 11, and is composed of a columnar magnet 22a made of a permanent magnet, for example, embedded from the back side of the base plate (see FIG. 1). .
As a result, the spherical rotating body 14a of the restricting magnetic body portion 21 of the magnetic body on the loading plate member 12 side faces the columnar magnet 22a of the restricting magnet portion 22 on the base plate member 11 side. The movement of the spherical rotating body 14a of the body is restricted by the magnetic force of the columnar magnet 22a, and the movement of the loading plate member 12 in the normal state can be restricted by the magnetic force.
On the other hand, during an earthquake, a larger force is applied than in normal times, so that the magnetic force of the columnar magnet 22a of the restricting magnet portion 22 that restrains the spherical rotating body 14a of the restricting magnetic body portion 21 is overcome and loaded from the restricted state by the magnetic force The plate member 12 is released and can freely roll on the base plate member 11 to exhibit a seismic isolation effect.
Therefore, the diameter of the spherical rotating body 14a of the restricting magnetic body portion 21 constituting the magnetic force movement restricting means 20 and the size (opposite area) of the columnar magnet 22a of the restricting magnet portion 22 are compared with the external force applied at normal time. Therefore, it is possible to maintain the regulated state and to release the regulated state for a large force in the event of an earthquake, achieving both normal stability and seismic isolation during an earthquake. Can be made.
That is, considering the weight of the load placed on the loading plate member 12, the cylindrical magnet 22a on the base plate member 11 side according to the magnetic force that needs to be applied to the spherical rotating body 14a on the loading plate member 12 side. It is only necessary to set the number, size, strength, etc., and it is not always necessary to apply a magnetic force to all the spherical rotating bodies 14a.
By such magnetic force movement restricting means 20, for example, normal movement such as opening / closing operation of a paper feed tray of a desktop printer can be restricted, and a seismic isolation effect can be exhibited in the event of an earthquake.
On the other hand, after the earthquake motion is settled, the loading plate member 12 is pulled back to the origin O of the base plate member 11 by the elastic member 13 and returned to the origin, and the columnar magnet 22a acting on the spherical rotating body 14a is restored. The movement is restricted again by the magnetic force. Thereby, the seismic isolation device 10 is kept stationary by the magnetic force movement restricting means 20 and can be prepared for the next earthquake motion.
Further, the spherical rotating body 14a of the loading plate member 12 at the time of the earthquake rolls smoothly and is seismically isolated because the columnar magnet 22a of the base plate member 11 is embedded from the back surface and the surface of the base plate member 11 is a flat surface. can do.

In the above embodiment, the restricting magnet portion 22 of the magnetic force movement restricting means 20 is embedded in the base plate member 11 from the back side to provide the columnar magnet 22a. However, the columnar magnet 22a is provided as the base plate member 11. It may be made to embed from the surface side, and a larger magnetic force can be applied by directly contacting the cylindrical magnet 22a and the spherical rotating body 14a of the magnetic body (see FIG. 2A).
In addition, the restriction magnet portion 22 of the magnetic force movement restricting means 20 is embedded from the surface side of the base plate member 11, and the surface of the base plate member 11 is covered with the second base plate member 11 c so as to be uneven. It is more preferable to ensure a surface free from any problem (see FIG. 2B). By doing so, the thickness of the second base plate member 11c can be reduced to ensure a flat surface. On the other hand, when the cylindrical magnet 22a is embedded from the back side of the base plate member 11, the bottom of the hole cannot be flattened due to processing with a drill, and a certain amount of thickness is reached by the surface of the base plate member 11. However, by using the second base plate member 11c thinner than this wall thickness, a larger magnetic force can be applied and the movement of the loading plate member 12 can be restricted.

Furthermore, instead of providing the restricting magnet portion 22 of the base plate member 11 with a plurality of columnar magnets 22a so as to be opposed to the spherical rotating bodies 14a of the restricting magnetic body portion 21, as shown in FIG. Although it may be configured by one plate-like annular magnet 22b, the annular magnet 22b is embedded from the surface side of the base plate member 11 and covered with the second base plate member 11c, or is not illustrated. The second base plate member 11c is omitted.
Although not shown in the figure by such an annular magnet 22b, the normal movement of the spherical rotating body 14a of the magnetic material can be controlled by a magnetic force, and a large force during an earthquake can be controlled. By overcoming and being released, it can be seismically isolated.
In addition, it can replace with one plate-shaped annular magnet 22b, and can also be comprised with one plate-shaped disk-shaped magnet. In this case, the base plate member 11 has a structure that prevents interference with the column portion 11b that protrudes to the center portion.

In the magnetic force movement restricting means 20 described in the embodiments so far, the restriction magnetic body portion 21 is provided on the loading plate member 12 side, and the restriction magnet portion 22 is provided on the base plate member 11 side. The magnetic body portion 21 is a magnetic spherical rotating body 14a, and the restricting magnet portion 22 is a columnar magnet 22a, an annular magnet 22b, or a disk-shaped magnet (not shown). The restricting magnetic body portion 21 is a base plate member. It can also be constituted by a spherical rotating body 14a comprising a cylindrical magnetic body, an annular magnetic body, and a disk-like magnetic body on the 11th side, and the regulating magnet portion 22 being a spherical magnet on the loading plate member 12 side.
Further, instead of providing the magnetic force movement restricting means 20 between the rolling member 14 on the loading plate member 12 side and the base plate member 11, a sliding member is provided between the loading plate member 12 and the base plate member 11 to prevent slippage. In the case of a seismic motion, a magnetic body or a magnet is arranged inside either one or the other sliding member to ensure the slipperiness of the surface, and the movement by magnetic force can be regulated by the magnetic body and the magnet. Configure as follows.

Next, another embodiment of the seismic isolation device of the present invention will be described with reference to FIG.
In this seismic isolation device 10A, the configuration of the magnetic force movement restricting means 20A is different, and the same components as those already described are denoted by the same reference numerals, and redundant description is omitted.
The magnetic force movement restricting means 20A attaches a magnet 22c constituting the restricting magnet part 22 to the upper part of the support pillar part 11b of the base plate member 11, and uses a magnetic disc 21a as the restricting magnetic part 21 facing the magnet 22c. The loading plate member 12 is provided at the center.
According to such a magnetic force movement restricting means 20A, by providing the magnetic disk 21a on the loading plate member 12 side and the magnet 22c on the base plate member 11 side opposite thereto, the disk is generated by the magnetic force of the magnet 22c. The movement of 21a can be regulated.
Therefore, the loading plate member 12 at the normal time can be held in a stable state by securing the magnetic force necessary for restricting the movement between the magnet 22c and the disc 21a. In the magnetic force movement restricting means 20A, a necessary magnetic force may be ensured depending on the size of the facing area of the magnet 22c and the disk 21a.
On the other hand, when a large force is applied to the loading plate member 12 during an earthquake, the loading plate member 12 overcomes the magnetic force by the magnetic force movement restricting means 20A and rolls on the base plate member 11 by the spherical rotating body 14a. It becomes an earthquake state.
According to the magnetic force movement restricting means 20A, the magnet 22c and the disk 21a need only be provided at the center portions of the base plate member 11 and the loading plate member 12, and the movement by the magnet 22c is released. After that, the magnetic force by the magnet 22c does not act or affect other things, and smooth rolling can be ensured.

Next, another embodiment of the seismic isolation device will be described with reference to FIG.
The seismic isolation device 10B is configured by forming a base plate member 11A and a loading plate member 12A into a quadrangular shape.
The base plate member 11A is fixedly installed on a floor surface or a table or the like, and includes, for example, a rectangular lower plate 11Aa and a column portion 11Ab protruding upward concentrically with the center point O. Yes. In the column part 11Ab, four spring connection points (first connection points) 16A on the center point O side where the one end connection parts 13a of the elastic member 13 are connected at intervals of 90 degrees are provided in the center part of each side. is there.
On the lower plate 11Aa of the base plate member 11A, a rectangular loading plate member 12A is arranged concentrically with the center point O as the center. The loading plate member 12 includes a quadrangular loading plate 12Aa and a quadrangular frame-shaped outer frame portion 12Ab protruding below the outer peripheral portion of the loading plate 12Aa. The loading plate 12Aa is formed in a rectangular shape smaller than the lower plate 11Aa. On the loading plate 12Aa, a load such as a device is placed.
A spring connecting point (second connecting point) 17A to which the other end connecting portion 13b of the elastic member 13 is connected to the four corners inside the outer frame portion 12Ab of the loading plate member 12A is a spring on the center point O side. Four connecting points 16A are provided at intervals of 90 degrees shifted by 45 degrees. A total of eight elastic members 13, each having two spring connection points 16 </ b> A on the center point O side and four spring connection points 17 </ b> A shifted by 45 degrees of the outer frame portion 12 </ b> Ab on the outer peripheral side. As described above, the tension coil spring is connected through one end connecting portion 13a and the other end connecting portion 13b.

Although not shown in the seismic isolation device 10B, a plurality of spherical rotating bodies 14a are provided as rolling members 14 on the lower surface of the outer frame portion 12Ab of the loading plate member 12A as in the case of the seismic isolation device (see FIGS. 1 and 4). For example, eight spherical rotating bodies 14a are attached via the support frame 14b. That is, in the seismic isolation device 10B, the seismic isolation device 10B is disposed on the lower surface of the outer frame portion 12Ab of the loading plate member 12A outside the spring coupling point 17 which is the second coupling point. The rolling member 14 supports the load loaded on the loading plate 12Aa in a stable state and moves the rolling on the lower plate 11Aa. The rolling member 14 can move in a stable state and can support the load. The number of 14 is set.
As a result, the loading plate member 12A rolls in any direction through the spherical rotating body in a moving state, with the range until the outer frame portion 12Ab of the loading plate 12Aa hits the support column 11Ab on the lower plate 11Aa. It is movable and is configured to perform so-called rolling seismic isolation.
Although not shown in the seismic isolation device 10B, magnetic force movement restricting means 20 and 20A are provided between the rolling member 14 and the base plate member 11A, and the movement of the loading plate member 12A during normal time is restricted by the magnetic force. In the event of an earthquake, the restriction of movement by the magnetic force movement restricting means 20, 20A is released, and the loading plate member 12A moves freely and exhibits a seismic isolation effect (see FIGS. 1 to 4). .

In the seismic isolation device 10 </ b> B configured as described above, the loading plate member 12 </ b> A is normally moved by the magnetic force of the cylindrical magnet 22 a of the restricting magnet portion 22 by the magnetic rotating member 14 of the rolling member 14 by the magnetic force movement restricting means 20. Is restricted (see FIG. 1 and the like).
On the other hand, at the time of an earthquake, the loading plate member 12A can freely roll and move by the movement of the magnetic force movement restricting means 20 being released by the input earthquake motion, and the outer frame portion 12Ab of the loading plate member 12A is mainly moved by the elastic member 13. The seismic isolation state is achieved by moving in the direction of pushing or pulling with the urging force applied to the inner surface of.
By such magnetic force movement restricting means 20, 20A, it is possible to restrict the movement of the loading plate member 12A due to a normal external force. For example, it restricts the normal movement such as the opening / closing operation of the paper feed tray of the desktop printer. In the event of an earthquake, the seismic isolation effect can be demonstrated.
In this seismic isolation device 10B, the probability that the expansion / contraction direction B of the elastic member 13 and the linear direction (radiation direction) A as the moving direction overlap at the time of an earthquake is very small, and functions in the same manner as the circular loading plate member 12. Even if the loading plate member 12A (the base plate member 11A relatively moves in the event of an earthquake) may move in the expansion / contraction direction B of one elastic member 13, the expansion / contraction direction of the other elastic member 13 Since it does not overlap with B, when it resonates with the natural vibration of the spring, it is possible to suppress the mutual vibration frequency from being canceled and amplifying the vibration.

Further, since the expansion / contraction direction B of the elastic member 13 and the radial direction A passing through the center point O of the base plate member 11A are shifted, as described above, the direction of the earthquake motion is the center point O of the loading plate member 12A. Even if it coincides with the radial direction A, the elastic member 13 is prevented from restricting the movable range of the loading plate member 12A, and a sufficient movable range (movement range of the loading plate member 12A) can be secured. Thus, unlike the case where the movable range of the base plate 3 is limited by the elastic body 4 itself due to the arrangement of the conventional elastic body 4 shown in FIG. 6C, when securing the same movable range, The seismic isolation device 10B can be downsized.
In addition, by arranging the eight elastic members 13 equally between the spring connecting point 16A on the center point O side and the spring connecting point 17A on the outer peripheral portion side, on the left and right sides sandwiching the radial direction A. The loading plate member 12A is moved in a straight line in the traveling direction without being twisted by the opposing elastic member 13, and the rotation of the loading plate member 12A and the load on the loading plate member 12A can be suppressed. Furthermore, by arranging the elastic members 13 equally on both the left and right sides across the radial direction A, the load of each elastic member 13 becomes uniform, and there is an effect that breakage is suppressed.

In the above embodiment, the case where the loading plate members 12 and 12A are made smaller than the base plate members 11 and 11A has been described as an example in any of the seismic isolation devices 10, 10A and 10B. 12A may have the same shape as the base plate members 11 and 11A, and only the loading plate members 12 and 12A may be seen from above at normal times. In this case, the outer frame portions 12b and 12Ab of the loading plate members 12 and 12A may be widened, or a second outer frame portion may be provided outside the outer frame portions 12b and 12Ab. The spherical rotating body 14a may be left in its original position.
As a result, in a stationary state, the loading plate members 12 and 12A are covered with the base plate members 11 and 11A. By covering the outer edge portions of the base plate members 11 and 11A, dust and dirt on the lower plates 11a and 11Aa, etc. Can be prevented as much as possible to ensure smooth rolling of the rolling member 14.
Moreover, the magnitude | size of the seismic isolation apparatus 10, 10A, 10B can be recognized as the magnitude | size of the loading plate member 12, and it will be in the state which cannot see the outer edge part of the base plate members 11, 11A. On the other hand, at the time of an earthquake, the rolling member 14 inside the outer frame portions 12b and 12Ab of the loading plate members 12 and 12A rolls on the base plate members 11 and 11A to ensure a necessary movable range and roll. Can do.
Also, the movement of the loading plate members 12 and 12A can be regulated by the magnetic force by the magnetic force movement restricting means 20 and 20A, and can be held in a stable state. By releasing the restricted state, seismic isolation during an earthquake can be secured. This makes it possible to achieve both normal stability and seismic isolation. For example, normal movement such as opening and closing operations of the paper tray of a desktop printer is regulated. The effect can be demonstrated.
Since the movable range is from the outside of the rolling member 14 to the outer ends of the base plate members 11 and 11A, the size of the base plate members 11 and 11A may be determined according to the necessary movable range of the rolling member 14. .

In such seismic isolation devices 10, 10 </ b> A, 10 </ b> B, in order to make the seismic isolation effect due to the arrangement of the elastic member 13 more effective, the elasticity of an appropriate spring constant k with respect to the load applied to the loading plate members 12, 12 </ b> A. The member 13 needs to be selected.
For example, in the case where the elastic members 13 in the case of the seismic isolation devices 10 and 10A are provided with six elastic members 13 and the loading amount of the loading plate member 12 is less than 10 kg, the spring constant k is 0.0015 or more and 0.0040 N. / Mm or less is preferable.
In addition, when the loading amount on the loading plate member 12 is 10 kg or more and 50 kg or less, the spring constant k of the elastic member 13 is preferably 0.0020 or more and 0.0060 N / mm or less.

In addition, the loading plate member 12 (the loading plate 12 a of the loading plate member 12) connected by the elastic member 13 has the outer frame portion 12 b in contact with the column portion 11 b on the center point O side of the base plate member 11 on the base plate member 11. The movement distance (movable range) is 16 cm or more on the base plate member 11 when the loaded load is less than 10 kg. It is desirable to make it movable. In addition, when the loading load is 10 kg or more and 50 kg or less, the loading plate member 12 connected by the elastic member 13 is configured to be movable on the base plate member 11 by 20 cm or more (10 cm to the left and right respectively). Is desirable.
In order to secure such a moving distance of the loading plate member 12, it is necessary to secure a space for the elastic member 13 that is compressed and contracted with the movement. In the seismic isolation device 10 (10 </ b> A), the elastic member 13 Since the expansion / contraction direction B and the radial direction A in which the loading plate member 12 moves are shifted, the expansion / contraction space of the elastic member 13 can be easily secured, and the seismic isolation device 10 (10A) can be downsized. .

Furthermore, in the seismic isolation device 10 (10A), since the rolling member 14 rolls in an arbitrary direction on the lower plate 11a of the base plate member 11, the base plate member 11 itself is removed in order to ensure the seismic isolation effect. It is preferable that the friction reducing member is formed on the lower plate 11a so as to be configured by a member having low friction or to roll smoothly by reducing rolling friction.
As this friction reducing member, for example, a material having a low friction coefficient such as an acrylic resin material or a fluorine resin material (for example, PTFE (polytetrafluoroethylene)) is most preferable, and polyethylene or other low friction coefficient materials can also be used.
Further, it is more preferable that the friction reducing member is provided with unevenness even in a flat planar shape so as to reduce the contact area with the lower plate 11a and the like with respect to the entire area of the lower plate 11a.
Further, the friction reducing member is not limited to the case where a sheet-like member is attached on the lower plate 11a, but can be formed as a friction reducing member by applying the coating material of the above material on the lower plate 11a.
In this case, when the friction reducing member is provided on the lower plate 11a to roll the rolling member 14 in an arbitrary direction, if the friction with the friction reducing member is too small, the rolling member 14 does not roll. The effect of rolling cannot be obtained.
Therefore, in the case of rolling isolation using the rolling member 14, there is an appropriate range of friction, and for example, the surface roughness (Ra) is preferably 0.01 to 0.1 μm.
Furthermore, the base plate member 11 including the friction reducing member needs to have a hardness that allows the rolling member 14 and the like to smoothly roll even when a load is applied. Although the hardness of the surface of the base plate member 11 including the friction reducing member varies depending on the size of the sphere of the rolling member 14, for example, the Asker A hardness is preferably 50 or more.

In the above embodiment, the base plate member 11 is isolated from the base plate member 11 by rolling by the spherical rotating body 14a constituting the rolling member 14 attached to the outer frame portion 12b of the loading plate member 12. Instead of the rolling member 14, a sliding member having a low friction surface is used, and the sliding surface is slid on the lower plate 11 a or the friction reducing member of the lower plate 11 a so that the sliding surfaces can be slid. It can also be configured to shake. The elastic member 13 is connected by shifting the expansion / contraction direction B of the elastic member 13 and the radial direction A with respect to the center point O of the base plate member 11, and the spring connection point 16 on the center point O side and the spring connection point on the outer peripheral side. What is necessary is just to set it as the structure which connects the elastic member 13 between.
In addition, even in the case of a structure that provides seismic isolation by sliding, magnetic force movement restricting means 20 is provided between the base plate member 11 and the loading plate member 12, and in normal times, the movement of the loading plate member 12 is restricted by magnetic force, During an earthquake, the loading plate member 12 overcomes the magnetic force and freely moves to exert a seismic isolation effect.
Even when the sliding surfaces of such sliding members are in contact with each other by sliding, it is possible to prevent the vibrations from canceling each other and amplifying the vibration when resonating with the natural vibration of the spring. it can. Further, by providing a sliding member on the outer frame portion 12b of the loading plate member 12 to support the load, the loading plate member 12 can always support the load in a stable state. Furthermore, as already described with the seismic isolation device 10 as described above, in addition to the attenuation of the energy of the seismic motion, there are effects such as sufficient securing of the movable range of the loading plate member 12. Moreover, when securing the same range of motion, the seismic isolation device 10 can be downsized.

The seismic isolation device of the present invention can also be configured by reversing the upper and lower sides so that the base plate member 11 described in the above embodiment is a loading plate member and the loading plate member 12 is a base plate member.
In this case, the lower plate member is constituted by a lower plate and an outer frame portion of the outer peripheral portion thereof, and the loading plate member is constituted by including a loading plate and a column portion at the center thereof.
The rolling member 14 is attached to the upper surface of the outer frame portion of the lower plate 11a.
The elastic member 13 has an expansion / contraction direction B between the first attachment point of the column portion on the center point O side and the second attachment point of the outer frame portion on the outer peripheral portion side, similarly to the already described seismic isolation device. It arranges and connects in the state shifted from radiation direction A. In addition, it is necessary to be able to support the load and move the rolling with the rolling member in a stable state within the movable range of the loading plate member.
Further, the magnetic force movement restricting means 20 is provided between the lower plate 11 a located at the upper part and the loading plate member 12 located at the lower part. For example, the spherical rotating body 14 a of the upward rolling member 14 is used as the restricting magnetic body part 21. The movement of the restricting magnetic body portion 21 is restricted by the restricting magnet portion 22. In this way, it is possible to restrict the lower plate member on which the load is placed during normal operation from moving with respect to the load plate member, and in the event of an earthquake, the lower plate member on which the load is placed is relative to the load plate member. As a result, the magnetic force movement restricting means is in a released state and freely moves to exert a seismic isolation effect.
Such an inverted seismic isolation device can achieve the same effects as the already described seismic isolation device 10 and the like.

The seismic isolation device 10 (10A, 10B) of the present invention includes a base plate member 11, a loading plate member 12 that is movable on the base plate member 11 via a rolling member 14, and an elastic member disposed between them. Seismic isolation composed of a member 13 and a magnetic movement restricting means 20 provided between the base plate member 11 and the loading plate member 12 for restricting relative movement at normal times and enabling relative movement against seismic motion. The apparatus 10 (10A, 10B) can be configured as one unit, and can be configured as a seismic isolation apparatus including a plurality of units. In this seismic isolation device, a single load is placed on the loading plate member 12 of a plurality of units.
For example, when the loaded luggage is a large square shape, four units (the seismic isolation devices 10, 10A, 10B) are arranged at the four corners of the loaded luggage, so that it is normally stabilized by the movement restricting means of each unit. Thus, the load can be supported and, at the time of an earthquake, the magnetic force movement restricting means 20 is released to obtain a sufficient seismic isolation effect.
Note that the number of units used as the seismic isolation device is not limited to the case of four units, but may be two or more, and may be determined according to the projected area and weight of the load on the plane.

  According to the seismic isolation device 10 of the present invention, the base plate member 11, the loading plate member 12 that is disposed on the base plate member 11 and on which the load is placed, and the base plate member 11 and the loading plate member 12 are provided. A seismic isolation device comprising: a sliding member or rolling member 14 that enables relative movement; and a plurality of elastic members 13 that are connected between the base plate member 11 and the loading plate member 12 and that absorb earthquake motion and restore the position before the earthquake. The apparatus 10 includes a magnetic movement restricting means 20 between the base plate member 11 and the loading plate member 12 that restricts relative movement in a normal state by magnetic force and enables relative movement with respect to seismic motion. Therefore, the movement of the loading plate member 12 at the normal time can be restricted by the magnetic force movement restricting means 20, while the normal time at the time of the earthquake. Since the base large force is applied, regulation by the magnetic force movement restricting means 20 is released, the loading plate member 12 can freely roll on the base plate member 11, it exhibits a seismic isolation effect. Thereby, the seismic isolation apparatus 10 which has sufficient seismic isolation property at the time of an earthquake and can stably load a load can be provided at a normal time.

  According to the seismic isolation device 10 of the present invention, the magnetic force movement restricting means 20 is provided on one of the base plate member 11 and the loading plate member 12 and the restricting magnetic body portion 21 is provided on one of the other. The base plate member 11 and the loading plate member are configured by the magnetic force acting between the restricting magnetic body portion 21 and the restricting magnet portion 22 because the restricting magnet portion 22 restricts the movement of the magnetic body portion 21. 12 can be controlled relative to the normal movement, can be kept stable by restricting the normal movement, to ensure the seismic isolation state by releasing the restriction of movement in the event of an earthquake be able to.

  According to the seismic isolation device 10 of the present invention, the restricting magnetic body portion 21 is configured to serve as a sliding member or a rolling member 14 provided on one of the base plate member 21 and the loading plate member 12, and is used for restriction. Since the magnet part 22 is provided in either one of the base plate member 11 and the loading plate member 12 and is configured to have a plurality of pillars or one plate facing the sliding member or the rolling member 14, the magnetic sliding member Further, by constituting with a rolling member and a columnar or plate-like magnet, an increase in the number of parts can be suppressed and the structure can be simplified.

  According to the seismic isolation device 10 of the present invention, the restricting magnet portion 22 is configured to be embedded from the front surface side or the back surface side of the base plate member 11. It can be made to act on the magnetic body part 21, and the flatness of the surface of the base plate member 11 can be ensured from the back side.

  According to the seismic isolation device 10 of the present invention, the second base plate member 11c is provided on the surface of the restriction magnet portion 22 embedded from the surface side of the base plate member 11, so that the second base plate The flatness of the rolling surface of the rolling member 14 can be ensured by the member 11c.

  According to the seismic isolation device 10 of the present invention, the elastic member 13 includes the first connection point 16 on the center point side of the base plate member 11 or the loading plate member 12 and the outer peripheral side of the loading plate member 12 or the base plate member 11. A linear direction A connecting the first connection point 16 and the second connection point 17 between the second connection point 17 and the radial direction A centered on the center point of the base plate member 11 or the loading plate member 12. Are connected to each other so that the elastic member 13 can be prevented from being amplified even if resonance due to the natural vibration of the elastic member 13 occurs, and the loading plate member 12 can be returned to the origin. In addition to being able to attenuate the energy from the earthquake. In addition, since the expansion / contraction direction B of the elastic member 13 and the linear direction (radial direction) A that is the moving direction of the loading plate member 12 do not coincide with each other, the space in which the elastic member 13 is compressed is sufficiently small. The range of motion can be secured and the seismic isolation device can be miniaturized.

  According to the seismic isolation devices 10, 10 </ b> A, and 10 </ b> B of the present invention, the sliding member or the rolling member 14 is located on the inner side of the first connection point 16, on the concentric circle of the second connection point 17, or from the second connection point 17. Further, by arranging it on either outer side, the degree of freedom of arrangement of the sliding member or the rolling member 14 is increased, and the seismic isolation devices 10, 10A, 10B can be configured with a necessary movable range secured.

  According to the seismic isolation device 10 of the present invention, the seismic isolation devices 10, 10 </ b> A, and 10 </ b> B are provided as one unit, and a single load can be placed on the loading plate member 12 of a plurality of units. Thus, even when the load is large, it can be stably supported. Further, by changing the number of units, the degree of freedom with respect to the size and weight of the loaded luggage can be increased.

In the above-described embodiment, the outer shape of the base plate member 11 and the loading plate member 12 of the seismic isolation device 10 has been described as an example of a circular shape or a rectangular shape. However, there is no limitation on the outer shape, and an arbitrary outer shape is used. The base plate member and the loading plate member may have different external shapes.
Further, although the tension coil spring has been described as an example of the elastic member 13, the invention is not limited to this, and a member having elasticity such as rubber can also be used.
Further, the magnetic force movement restricting means 20, 20A has been described as an example in which one is configured as a magnetic body and the other is configured as a magnet. it can.

DESCRIPTION OF SYMBOLS 10 Seismic isolation device 11 Base plate member 11a Lower plate 11b Support | pillar part 11c 2nd base plate member 12 Loading plate member 12a Loading plate 12b Outer frame part 13 Elastic member (tensile coil spring)
13a One end connecting portion 13b Other end connecting portion 14 Rolling member 14a Spherical rotating body (regulating convex portion)
14b Support frame 16 First spring connection point (first connection point)
17 Second spring connection point (second connection point)
10A Seismic isolation device 10B Seismic isolation device 11A Base plate member 11Aa Lower plate 11Ab Column portion 12A Loading plate member 12Aa Loading plate 12Ab Outer frame portion 16A First spring connection point (first connection point)
17A Second spring connection point (second connection point)
20 magnetic force movement restricting means 20A magnetic force movement restricting means 21 restricting magnetic body portion 21a disc 22 restricting magnet portion 22a cylindrical magnet 22b annular magnet 22c magnet A linear direction (radial direction)
B Stretching direction (elastic member mounting direction)
C Angle D Direction of ground motion O Center point (return origin)

Claims (8)

A base plate member;
A loading plate member disposed on the base plate member and on which a load is placed;
A sliding member or a rolling member provided between the base plate member and the load plate member described above and capable of relative movement;
A plurality of elastic members coupled between the base plate member and the load plate member described above to absorb seismic motion and restore the position before the earthquake,
Between the base plate member and the load plate member described above is provided with a magnetic force movement restricting means that restricts relative movement at normal time by magnetic force and enables relative movement against earthquake motion.
A seismic isolation device characterized by that. The magnetic force movement restricting means includes a restricting magnetic body portion provided on one of the base plate member and the load plate member, and a restricting magnet provided on either one of the restricting magnetic body portions. Composed of parts,
The seismic isolation device according to claim 1. The restricting magnetic body portion is configured to serve also as the sliding member or the rolling member provided on any one of the base plate member and the load plate member described above,
The restriction magnet portion is provided on any one of the base plate member and the load plate member described above, and is configured in a plurality of columnar shapes or one plate shape facing the sliding member or the rolling member,
The seismic isolation device according to claim 2. The restriction magnet portion is configured to be embedded from the front side or the back side of the base plate member.
The seismic isolation device according to claim 3. On the surface of the restriction magnet portion embedded from the surface side of the base plate member, a second base plate member is provided.
The seismic isolation device according to claim 4. The elastic member includes the base plate between the first connection point on the center point side of the base plate member or the load plate member and the second connection point on the outer peripheral side of the load plate member or the base plate member. The radial direction centering on the center point of the member or the load plate member and the linear direction connecting the first connection point and the second connection point are shifted and connected,
The seismic isolation device according to any one of claims 1 to 5. The sliding member or the rolling member is disposed either on the inner side of the first connection point, on a concentric circle of the second connection point, or on the outer side of the second connection point.
The seismic isolation device according to claim 6. The seismic isolation device according to any one of claims 1 to 7 is provided as a unit, and a single load can be placed on the load plate member of the plurality of units.
A seismic isolation device characterized by that.

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