JP6457232B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device.

  Seismic isolation devices are used as one of the earthquake countermeasures, and not only large structures such as buildings, but also seismic isolation devices for pottery and art, small and lightweight equipment, tropical fish tanks, etc. It has been.

  The seismic isolation device for small and lightweight devices is based on the principles of rolling isolation and sliding isolation, for example, it has a structure with two or more layers above and below, with rollers and balls arranged between them. In addition, it uses rolling friction to absorb the energy of earthquake motion.

  For example, a seismic isolation device for small and light objects such as arts and crafts is disclosed in Patent Document 1, which has a lower substrate and an upper base plate positioned on the substrate, and is spherical. An intermediate plate that is rotatably supported by contacting the rotating body with the substrate located at the lower portion and the base plate located at the upper portion is slidably and non-fixedly arranged between the substrate and the base plate. However, the base plate is urged by a plurality of elastic members such as coil springs and rubber springs so that the base plate returns directly above the substrate.

JP 2007-239907 A

In such a seismic isolation device of Patent Document 1, a plurality of elastic members, for example, four coil springs, are arranged at an equal interval of 90 degrees with respect to the center of the base plate in order to return the base plate directly above the base plate. It is connected between the boards. These coil springs are arranged in the radial direction with respect to the center of the base plate, and the expansion / contraction direction of the coil springs coincides with the radial direction which is the mounting direction of the coil spring.
For this reason, when the base plate moves due to the earthquake motion, the center of the base plate moves in any radial direction, and depending on the direction of the earthquake motion, resonance occurs at the natural frequency of the coil spring, and the expansion and contraction directions coincide. There is a problem that vibration is amplified by the coil spring.
Moreover, when it is going to secure the movable range of a seismic isolation apparatus, it is necessary to ensure the space where a coil spring is compressed, and the problem that an apparatus will enlarge correspondingly arises.
Furthermore, when trying to reduce the size of the seismic isolation device itself, the base plate becomes small, and the distance from the center of the base plate of the spherical rotating body becomes small, so that the load cannot be stably placed on the base plate. Problems arise.

  The present invention has been made in view of the problems in the prior art, and can prevent amplification of vibration due to resonance at the natural frequency of the elastic member for returning to the origin, ensuring a sufficient range of motion. The aim of the present invention is to provide a seismic isolation device that can downsize the device and stably place a load.

In order to solve the above-mentioned problem, after carrying out an intensive study on the elastic member that has the effect of attenuating the energy of the seismic motion of the seismic isolation device and urges the loading plate member on which the loaded load is loaded to return to the origin, The center of the plate member is moved in the radial direction, whereas the conventional elastic member is installed with its expansion / contraction direction aligned with the radial direction as the movement direction.
For this reason, it has been found that when resonance occurs at the natural frequency of the elastic member, a phenomenon in which vibration is amplified by the elastic member having the same expansion / contraction direction occurs.
Thus, it has been found that shifting the movement direction of the center of the loading plate member and the expansion / contraction direction of the elastic member is effective in preventing vibration amplification, and the present invention has been completed.
Also, shifting the center moving direction of the loading plate member and the elastic member's expansion / contraction direction to make the space where the elastic member can be compressed and compressed is effective in securing a movable range and reducing the size of the seismic isolation device. It was found to be effective.
A specific configuration of the present invention based on such knowledge is as follows.

That is, the seismic isolation device according to claim 1 of the present invention is
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,
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. A radiating direction centered on the center point of the member or the load plate member and a linear direction connecting the first connecting point and the second connecting point are connected to each other while being shifted,
The sliding member or the rolling member is disposed on the concentric circle of the second connection point or on the load plate member on the outer side of the second connection point while securing a necessary movable range with respect to the base plate member .
It is characterized by that.

The elastic member has a linear direction connecting the first connection point on the center point side and the second connection point on the outer peripheral side, and the first connection point on the center point and the center point side. You may make it comprise as an angle made with the said radiation direction which connects with 10 to 90 degree | times.

While providing the first connection point on the center point side at three locations at 120 degree intervals on a concentric circle centering on the center point,
The second connection points on the outer peripheral portion side are provided at three positions 120 degrees apart from the first connection points by 60 degrees on a concentric circle with the center point as the center,
6 elastic members are connected between the first connection point and the second connection point at three locations, respectively.
While providing the first connection point on the center point side at four positions at intervals of 90 degrees on concentric circles centering on the center point,
The second connection points on the outer peripheral portion side are provided at four locations at intervals of 90 degrees shifted from the first connection points by 45 degrees on a concentric circle with the center point as the center,
Each of the four elastic members may be connected and arranged between the four first connection points and the second connection points.

  The seismic isolation device may be provided as a single unit so that a single load can be placed on the load plate member of the plurality of units.

  According to the seismic isolation device of the present invention, the amplification of vibration due to resonance at the natural frequency of the elastic member can be prevented, the movable range is sufficiently secured, the device is downsized, and the load is stably placed. be able to.

It is a schematic sectional drawing which concerns on one Embodiment of the seismic isolation apparatus of this invention. It is the schematic plan view and schematic sectional drawing which abbreviate | omitted some loading plate members concerning 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 operating 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 sectional drawing which concerns on other one Embodiment of the seismic isolation apparatus of this invention. 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 includes a base plate member 11 placed on a floor surface or a table, and a loading plate member movable on the base plate member 11 via a rolling member 14. 12 and a plurality of elastic members 13 connected between the base plate member 11 and the loading plate member 12.
As shown in FIG. 2, the elastic member 13 is composed of, for example, six tension coil springs, and is connected to the connection points (first first points) of the three elastic members 13 at intervals of 120 degrees on the center point O side of the base plate member 11. A first spring connection point 16 (hereinafter referred to as a spring connection point 16) to be a connection point) and a spring connection point 16 on the center point O side of the three locations on the outer peripheral side of the loading plate member 12 shifted by 60 degrees. They are connected to second spring connection points 17 (hereinafter referred to as spring connection points 17) that become connection points (second connection points) of the three elastic members 13 at intervals of 120 degrees.
That is, as shown in FIG. 3, 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 expansion-contraction 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 base plate member 11 of the seismic isolation device 10 is fixedly installed on a floor surface or a table, for example, a disk-like lower plate 11a, and a column part 11b protruding upward concentrically with the center point O; It is configured with. The column part 11b is provided with three spring connection points 16 to which the one end connection 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. On the loading plate 12a, a load such as a device is placed.
The spring connecting point 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 60 degrees from the spring connecting point 16 on the center point O side. Three places are provided at intervals of 120 degrees.
Tensile coil springs are provided as six elastic members 13 in total, two each between three spring connection points 16 on the center point O side and three spring connection points 17 shifted 60 degrees on the outer peripheral side. It is connected via 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.
That is, in the seismic isolation device 10, a plurality of spherical rotating bodies 14 a serving as rolling members 14 are provided 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 can move in a rolling friction state in any direction through the spherical rotating body 14a until the outer frame portion 12b of the loading plate 12a hits the support column 11b on the lower plate 11a. It is configured to perform so-called rolling seismic isolation.
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 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 composed of six tension coil springs (return to the origin), and the energy at the time of earthquake excitation is absorbed, and the response acceleration Reduce.

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 the expansion / contraction 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. 4B, 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 member 4 itself due to the arrangement of the conventional elastic member 4 shown in FIG. 4C, 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 connection points 16 on the center point O side and the spring connection points 17 on the outer peripheral portion side at three locations. 4B, the loading plate member 12 moves in a straight line in the traveling direction without being twisted (rotation about the vertical axis) by the opposing elastic member 13 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. 3, the direction connecting the center point O of the base plate member 11 and the spring connecting point 16 on the side of the center point O of the elastic member 13 (also one radial direction A) and the expansion / contraction of the elastic member 13. It is desirable that the angle C formed with the direction B is large. 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 peripheral portion of the outer frame portion 12b of the loading plate member 12 mainly by the elastic member 13. The urging force is applied to the side to move in the direction of pushing or pulling, but 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. 4A, three elastic members 13 are used, and the elastic member 13 is in a state where the elastic force is not applied (stationary state), and the elastic member 13 extends and contracts in the center B of the base plate member 11. By shifting from the radial direction A with respect to the point O, the three spring connection points 16 of the column portions 11b of the base plate member 11 and the three spring connection points 17 of the outer frame portion 12b of the loading plate member 12 are connected. The seismic isolation device 10 can be configured.
Even with such a seismic isolation device 10, in the same way as the already described seismic isolation device 10, 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.

Next, another embodiment of the seismic isolation device will be described with reference to FIG.
In the seismic isolation device 10A, the outer diameter of the lower plate 11a of the base plate member 11 and the outer diameter of the outer frame portion 12b of the loading plate member 12 that rolls and moves on the lower plate 11a are the same. A rolling member 14 provided on the outer peripheral portion of the loading plate member 12 is attached to the inner peripheral side of the outer frame portion 12b, and is located at the same position as the rolling member 14 of the seismic isolation device 10. That is, the outer frame portion 12 b of the seismic isolation device 10 is in a state of being widened in accordance with the outer diameter of the base plate member 11.
As a result, in a stationary state, the loading plate member 12 is covered with the base plate member 11, and the outer edge portion of the base plate member 11 is covered to prevent dust and dirt from adhering to the lower plate 11a as much as possible. Smooth rolling of the member 14 can be ensured.
In addition, the size of the seismic isolation device 10A can be recognized as the size of the loading plate member 12, and the outer edge portion of the base plate member 11 is not visible. On the other hand, at the time of an earthquake, the rolling member 14 on the inner peripheral side of the outer frame portion 12b can roll on the base plate member 12, and can roll while securing a necessary movable range.
Therefore, in the seismic isolation devices 10 and 10A, the outer diameter of the lower plate 11a of the base plate member 11 may be determined according to the necessary movable range of the rolling member 14 attached to the outer frame portion 12b of the loading plate member 12. In the seismic device 10A, the outer frame portion 12b may be widened to have the same outer diameter in accordance with the outer diameter of the lower plate 11a.

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 </ b> A includes a rectangular loading plate 12 </ b> Aa and a rectangular frame-shaped outer frame portion 12 </ b> Ab protruding downward from the outer peripheral portion of the loading plate 12 </ b> Aa. 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, as with the seismic isolation device 10, a plurality of spherical rotating bodies, for example, eight spherical rotating bodies, are provided as rolling members on the lower surface of the outer frame portion 12Ab of the loading plate member 12A. Is attached via a support frame. 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 17A that is the second coupling point. The rolling member 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. 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.

In the seismic isolation device 10B configured as described above, the loading plate member 12A can freely roll and move due to the input earthquake motion, and an urging force is applied to the inner side surface of the outer frame portion 12Ab of the loading plate member 12A mainly by the elastic member 13. However, the probability that the expansion / contraction direction B of the elastic member 13 and the moving linear direction A overlap with each other is very small.
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. 4C, 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 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. Further, 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 20 cm or more on the base plate member (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 the friction reducing member, for example, an acrylic resin material or a fluorine resin material such as PTFE (polytetrafluoroethylene) is most preferable because it has a low friction coefficient, but 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.
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 member 11. The elastic member 13 has an expansion / contraction direction B between the first connection point of the column part on the center point O side and the second connection point of the outer frame part on the outer peripheral part side, as in 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.
Such an inverted seismic isolation device can achieve the same effects as the already described seismic isolation device 10 and the like.

In the seismic isolation device of the present invention, a base isolation member 10 (10A, 10B) including a base plate member 11, a loading plate member 12, and an elastic member 13 disposed therebetween is formed as a single unit. It can be configured as a seismic isolation device having a single unit. 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, it is possible to stably support the loaded luggage by arranging four units (the seismic isolation devices 10, 10A, 10B) at the four corners of the loaded luggage. Sufficient seismic isolation effect is obtained.
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 (10) comprising a sliding member or rolling member (14) capable of relative movement, and a plurality of elastic members (13) connected between the base plate member (11) and the loading plate member (12). The first connection point (spring connection point) 16 on the center point O side of the base plate member 11 or the loading plate member 12 and the second connection point (spring connection point) on the outer peripheral side of the loading plate member 12 or the base plate member 11. ) 17, the radial direction A centering on the center point O of the base plate member 11 or the loading plate member 12, and the first connection point The sliding member or the rolling member 14 is connected to the second connection point (spring connection point) by shifting the expansion and contraction direction B connecting the spring connection point (16) and the second connection point (spring connection point) 17 to each other. Point) 17 or on the loading plate member 12 outside the second connection point (spring connection point) 17 while securing a necessary range of motion relative to the base plate member 11 , the elastic member 13 is expanded and contracted. B and the linear direction A that moves during the earthquake of the loading plate member 12 do not coincide with each other, and it is possible to prevent the elastic member 13 from amplifying the vibration even if resonance occurs due to the natural vibration of the elastic member 13, and the loading plate member 12 can be returned to the origin, and the energy caused by the earthquake can be attenuated.
In addition, since the expansion / contraction direction B of the elastic member 13 and the linear direction A of the loading plate member 12 that moves during an earthquake do not coincide with each other, it is possible to secure a sufficient range of motion by making the space in which the elastic member 13 is compressed / compressed very small. The seismic isolation device can be downsized (see FIGS. 4A and 4B).
Further, the sliding member or the rolling member 14 is placed on the loading plate member 12 on the concentric circle of the second connection point (spring connection point) 17 or on the outer side of the second connection point (spring connection point) 17 with respect to the base plate member 11. Since the necessary movable range is secured and arranged, the load of the load can be supported in a stable state at all times, and can be moved and slid in a stable state.

According to the seismic isolation device 10 of the present invention, the elastic member 13 includes a first connection point (spring connection point) 16 on the center point O side and a second connection point (spring connection point) 17 on the outer peripheral side. Since the angle C formed by the expansion / contraction direction B to be connected and the radial direction A connecting the center point O and the first connecting point 16 on the center point side is configured to be not less than 10 degrees and not more than 90 degrees, the expansion / contraction direction of the elastic member 13 The elastic member 13 is placed between the first connection point (spring connection point) 16 and the second connection point (spring connection point) 17 without matching B and the linear direction A that moves during the earthquake of the loading plate member 12. Even when the seismic motion resonates with the natural frequency of the elastic member 13, it is possible to prevent the vibration of the elastic member 13 that has resonated from being amplified by canceling each other's vibration.
Further, the elastic member 13 is connected to the first connecting point (spring connecting point) 16 and the second connecting point (the second connecting point (spring connecting point) 16 without matching the expansion / contraction direction B of the elastic member 13 and the linear direction A moving during the earthquake of the loading plate member 12. It can be attached between the spring connecting point) 17 and the space in which the elastic member 13 is pressed and shrunk by the earthquake motion can be made extremely small to ensure a sufficient range of motion, and the seismic isolation device 10 can be downsized. it can.

According to the seismic isolation device 10 of the present invention, the first connection point (spring connection point) 16 on the center point O side is provided on three concentric circles centered on the center point O at intervals of 120 degrees, while the outer periphery. The second connection points (spring connection points) 17 on the part side are provided at three positions 120 degrees apart from the first connection points (spring connection points) 16 on a concentric circle centered on the center point O. Since the six elastic members 13 are connected between the first connection point (spring connection point) 16 and the second connection point (spring connection point) 17 at three locations, respectively, The arrangement of the members 13 can prevent the expansion / contraction direction B of each elastic member 13 from overlapping the radial direction A, thereby preventing vibration amplification even when the earthquake motion resonates with the natural frequency of the elastic member 13. be able to.
Further, by shifting the expansion / contraction direction B of the elastic member 13 and the radial direction A centering on the center point O of the loading plate member 12, resonance can be suppressed and the first connection is made at three locations. By placing six elastic members 13 equally between the point (spring connection point) 16 and the second connection point (spring connection point) 17 on both the left and right sides of the radial direction A, the loading plate member 12 Can move in a straight line in the advancing direction without being twisted by the opposing elastic members, and the rotation of the loading plate member 12 and the load on the loading plate member 12 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, durability increases, and breakage is suppressed.

According to the seismic isolation device 10 of the present invention, the first connection points (spring connection points) 16 on the center point O side are provided on four concentric circles centered on the center point O at four intervals of 90 degrees. The second connection points (spring connection points) 17 on the part side are provided at four positions 90 degrees apart from the first connection points (spring connection points) 16 on a concentric circle with the center point O as the center. Since the eight elastic members 13 are connected and arranged between the four first connection points (spring connection points) 16 and the second connection points (spring connection points) 17, respectively, The arrangement of the elastic members 13 can prevent the expansion / contraction direction B of each elastic member 13 from overlapping the radiation direction A, thereby preventing vibration amplification even when the earthquake motion resonates with the natural frequency of the elastic member 13. can do.
In addition, eight elastic members 13 are arranged evenly on both the left and right sides of the radial direction A between four first connection points (spring connection points) 16 and second connection points (spring connection points) 17. By doing so, the loading plate member 12 moves in a straight line in the traveling direction without being twisted by the opposing elastic member 13, and rotation of the loading plate member 12 and the load on the loading plate member 12 can be suppressed. Furthermore, by arranging the elastic member 13 equally on both the left and right sides across the radial direction A, the load on each elastic member 13 is equalized, durability is increased, and breakage is suppressed.

  According to the seismic isolation device 10 of the present invention, the seismic isolation device 10 is provided as one unit, and a single load can be placed on the loading plate member 12 of a plurality of units. Even if it is large, it can be supported stably. 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.

DESCRIPTION OF SYMBOLS 10 Base isolation device 11 Base plate member 11a Lower plate 11b Support | pillar part 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 14b Support frame 16 First spring connecting point (first connecting 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)
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 (5)

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,
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. A radiating direction centered on the center point of the member or the load plate member and a linear direction connecting the first connecting point and the second connecting point are connected to each other while being shifted,
The sliding member or the rolling member is disposed on the concentric circle of the second connection point or on the load plate member on the outer side of the second connection point while securing a necessary movable range with respect to the base plate member .
A seismic isolation device characterized by that. The elastic member has a linear direction connecting the first connection point on the center point side and the second connection point on the outer peripheral side, and the first connection point on the center point and the center point side. And the angle formed by the radial direction connecting the two is configured to be 10 degrees or more and 90 degrees or less,
The seismic isolation device according to claim 1. While providing the first connection point on the center point side at three locations at 120 degree intervals on a concentric circle centering on the center point,
The second connection points on the outer peripheral portion side are provided at three positions 120 degrees apart from the first connection points by 60 degrees on a concentric circle with the center point as the center,
Six elastic members are connected between the first connection point and the second connection point at three locations, respectively.
The seismic isolation device according to claim 1 or 2. While providing the first connection point on the center point side at four positions at intervals of 90 degrees on concentric circles centering on the center point,
The second connection points on the outer peripheral portion side are provided at four locations at intervals of 90 degrees shifted from the first connection points by 45 degrees on a concentric circle with the center point as the center,
8 elastic members are connected and arranged between the first connection point and the second connection point at four locations, respectively.
The seismic isolation device according to claim 1 or 2. The seismic isolation device according to any one of claims 1 to 4 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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