JP2015127589A - Aseismic base isolation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aseismic base isolation preventing a side surface cover from decreasing a base isolation effect.SOLUTION: A aseismic base isolation 100 has a base member 102, and a vibration energy intercepting device mounted on the base member 102 and intercepting the transmission of vibration energy on the base member 102 side; and places a base isolation object on an upper side of the vibration energy intercepting device. A side surface cover 132 is provided, which hides the vibration energy intercepting device. The side surface cover 132 is suspended from a side edge portion of the aseismic base isolation rotatably about a shaft of an upper part of the side surface cover 132, so as to rock by being pushed from the inside to the outside, during vibration energy intercepting operation of the vibration energy intercepting device.

Description

  The present invention relates to a base isolation table that can block vibration energy such as an earthquake from being transmitted to a mounted object, and more particularly to a structure of a side cover that is a blindfold of its internal mechanism.

  In art museums and museums, it is necessary to protect exhibits such as art and antiques from disasters caused by vibrations such as earthquakes. In order to protect exhibits such as art and antiques from disasters caused by vibrations, art and antiques are displayed on the base. The base isolation table includes a base, a vibration energy cutoff device mounted on the base, and a mounting table attached via the vibration energy cutoff device. The vibration energy blocking device blocks the vibration energy on the base side from being transmitted to the mounting table. Since the vibration energy is cut off, it is possible to prevent the exhibits on the mounting table from being overturned by vibrations and to protect the exhibits.

  There exists invention of patent document 1 as an example of the above base isolation tables. 14 and 15 show the structure of the base isolation table described in Patent Document 1. FIG. 14 and 15, the base 10 is overlapped and fixed on the base member 8. Both the base member 8 and the base 10 are substantially square in plan shape, and a pair of slide rails 16 are provided on the base 10 at positions near both side edges of the base 10 along the side edges of the base 10. Are attached in parallel to each other. As is well known, the slide rail 16 includes an outer rail, an inner rail, a retainer interposed between the inner and outer rails, and a ball held by the retainer and interposed between the inner and outer rails. When the ball rolls between the inner and outer rails, the inner and outer rails smoothly move linearly with each other.

  In the space above the base 10 sandwiched between the slide rails 16 on both side edges of the base 10, there is a coil spring 20 that is an origin return member. Both end portions of the coil spring 20 are hung on plate-like spring hooks 36 and 38. Both longitudinal ends of the spring hooks 36 and 38 are received by holding members 40 and 42 provided on the base 10, respectively. The coil spring 20 is held in a state of being slightly biased in the pulling direction by the holding structure including the spring hooks 36 and 38 and the holding members 40 and 42.

  A square-shaped first movable base 12 is placed on the slide rail 16, and the upper rail surface of the slide rail 16 and the first movable base 12 are coupled to each other. A set of two slide rails 18 are mounted on the first movable table 12 in parallel with each other along the side edges of the first movable table 12 at positions near both side edges of the first movable table 12. ing. The configuration of the slide rail 18 is the same as the configuration of the slide rail 16. The direction of the slide rail 18 is a direction orthogonal to the direction of the slide rail 16. In the space above the first movable base 12 sandwiched between the slide rails 18 on both side edges, there is a coil spring 22 that is an origin return member. The coil spring 22 is held in a state of being slightly biased in the pulling direction by a holding structure including spring hooks 36 and 38 and holding members 40 and 42. The directions of the coil spring 22 and the coil spring 20 are orthogonal to each other.

  A square-shaped second movable base 14 is placed on the slide rail 18, and the upper rail surface of the slide rail 18 and the second movable base 14 are coupled to each other. A top plate 82 is put on the second movable base 14. The top plate 82 moves integrally with the second movable base 14. The top plate 82 constitutes a placement table on which articles such as exhibits can be placed.

  An engaging member 44 is provided on the lower surface side of the first movable base 12 so as to correspond to the spring hooks 36 and 38. The engaging member 44 engages with the spring hook 36 or the spring hook 38 when the first movable base 12 moves in the direction of the slide rail 16. When the first movable base 12 is moved, one of the spring hook 36 or the spring hook 38 is engaged with the engaging member 44 paired therewith, and one of the spring hooks 36, 38 is moved outward. The coil spring 20 is extended. Thereby, a force for returning the first movable base 12 to the origin is stored in the coil spring 20.

  An engagement member (not shown) that engages with the spring hook 36 or the spring hook 38 by the movement of the second movable base 14 is also provided on the lower surface side of the second movable base 14. When the second movable base 14 moves and the engaging member engages one of the spring hooks 36 and 38, the coil spring 22 is extended, and the force for returning the second movable base 14 to the origin is stored. .

  A vibration energy blocking device is configured by the slide rail 16 and the slide rail 18 that are arranged in a direction orthogonal to each other between the base 10 and the second movable base 14. By providing the vibration energy shut-off device, even if the base 10 vibrates due to an earthquake or the like, the top plate 82 as a mounting table moves relative to the base 10 and the seismic energy is transmitted to the top plate 82. To be blocked. The vibration energy blocking device exhibits a seismic isolation effect that reduces the transmission of vibration energy during an earthquake to the top plate 82 and protects the exhibits on the top plate 82.

  As is apparent from FIGS. 14 and 15, there is a space for installing the vibration energy blocking device between the base 10 and the second movable table 14. If no blindfold is provided, the vibration energy blocking device is exposed. . When the vibration energy shut-off device is exposed, the aesthetic appearance is impaired, and there is a problem that dust easily enters the vibration energy shut-off device portion.

  Therefore, in the conventional example shown in FIGS. 14 and 15, the four sides around the base isolation table are surrounded by the side cover 24. The side cover 24 is made of a rectangular plate that can respectively close the four openings of the base isolation table, and rubber magnets 94 and 96 are fixed to the inner surface in two upper and lower stages. Further, one side of the L-shaped bracket 92 is fixed between the rubber magnets 94 and 96 on the inner surface side of the side cover 24, and the other side of the L-shaped bracket 92 protrudes from the inner surface of the side cover 24 at a right angle. One side of the L-shaped bracket 78 is fixed to the upper surface of the peripheral edge of the first movable base 12, and the other side of the L-shaped bracket 78 rises on the same plane as the end face of the first movable base 12.

  FIG. 15 shows an operation mode in which the vibration energy interrupting device including the first and second slide rails 16 and 18 is returned to the origin position by the stored force of the upper and lower coil springs. In this embodiment, one side of the L-shaped bracket 92 of the side cover 24 is placed on the upper surface of the base 10, and the upper rubber magnet 94 adsorbs the end surface of the first movable base 12 and one side of the L-shaped bracket 78. The lower rubber magnet 96 attracts the end surface of the base 10. The side covers 24 on the four sides around the base isolation table surround the opening on the side surface of the base isolation table, and are blindfolded to prevent the internal mechanism of the base isolation table from being seen from the outside.

  When the base 10 vibrates together with the floor due to an earthquake or the like, the first and second movable bases 12 and 14 try to stay in place with inertial force. The slide rail 16 of the vibration energy blocking device blocks transmission of vibration energy in the length direction to the first movable base 12. The energy component in the direction orthogonal to the length direction of the slide rail 16 is transmitted to the slide rail 18. This energy component is blocked by the slide rail 18 of the vibration energy blocking device and is not transmitted to the second movable base 14.

  As described above, when the first movable table 12 and the second movable table 14 move relative to the base 10 due to vibration such as an earthquake, the side cover 24 is moved. When the first movable base 12 moves, its end pushes the rubber magnet 94 above the side cover 24. The side cover 24 is tilted with the adsorption position between the end surface of the base 10 and the lower rubber magnet 96 as a fulcrum, and the space between the base 10 and the second movable base 14 is opened. Thereafter, the side cover 24 is withdrawn from the movement path to the outside of the first movable base 12 and the movement path of the spring hook 36 (or spring hook 38) moved by the first movable base 12, and the vibration energy cutoff device is It operates without being interfered by the side cover 24.

  When the second movable base 14 moves in a direction perpendicular to the paper surface in FIG. 15 due to the linear movement of the slide rail 16, the member that moves together with the second movable base 1 pushes the side cover 24 and the side cover as described above. Defeat 24. After the vibration energy shut-off device operates, the first and second movable bases 12 and 14 are returned to the original positions by the origin return member made of a coil spring. The fallen side cover 24 is attached to the original position by manual operation.

  There are Patent Document 2 and Patent Document 3 as prior art documents related to the present invention. In the invention described in Patent Document 2, a side cover that hides the internal structure is supported by a hinge on the edge of a frame of the seismic isolation device so as to be rotatable by a hinge. The side cover is urged in the closing direction by a spring, and has a cushioning material that stops the rotation of the side cover by the urging force at a rotational position where the side cover blocks the observation of the internal structure. During the seismic isolation operation, the side cover is pushed with a force exceeding the urging force and rotates in the release direction.

  In the invention described in Patent Document 3, a side plate that conceals the internal structure is supported at the edge of the upper plate of the seismic isolation device so as to be rotatable by being urged by a spring in the release direction. It has a catch member for maintaining the side plate rotated against the urging force in the closed position. When the catch member cannot maintain the closed position of the side plate due to the stress during the seismic isolation operation, the side plate is rotated to the release position by the biasing force.

Japanese Patent No. 2954882 JP-A-11-153185 JP 11-287291 A

  In the example of the conventional base isolation table shown in FIGS. 14 and 15, a side cover for improving the appearance is provided. In order to prevent the side cover from becoming an obstacle to the seismic isolation operation, the side cover is pushed and falls during the seismic isolation operation. For this purpose, the side cover is held at a predetermined position by a magnetic attractive force, and falls off from the predetermined position during the seismic isolation operation. Therefore, the side cover must be returned to the original position by manual operation after the seismic isolation operation, and the return operation is troublesome. Further, it is necessary to push the side cover against the magnetic attractive force during the seismic isolation operation, and the seismic isolation effect is reduced by the amount of force necessary to push the side cover.

  In the invention described in Patent Document 2, the side cover rotates by being pushed with a force that resists the urging force during the seismic isolation operation. In invention of patent document 3, it rotates by a side plate being pushed by the force exceeding the holding force by a catch member at the time of seismic isolation operation. In any of the inventions described in Patent Documents 2 and 3, the seismic isolation effect is exhibited and the seismic isolation effect is reduced only when a force greater than the force applied to the side cover and the side plate is applied.

  It is an object of the present invention to provide a base isolation table that prevents the side cover for improving the appearance from becoming a factor that reduces the seismic isolation effect, and that eliminates the need to return the side cover after the base isolation operation. Objective.

The present invention
A base member, and a vibration energy blocking device that is mounted on the base member and blocks transmission of vibration energy on the base member side. Is a base-isolated table,
It has a side cover that is a blindfold for the vibration energy shut-off device,
The side cover is rotatable about the axis of the upper part of the side cover so as to swing when pushed from the inside to the outside during the vibration energy cutoff operation of the vibration energy cutoff device. The main feature is that it is suspended from the side edge of the base.

  When the base member vibrates due to an earthquake or the like, the vibration energy shut-off device moves relative to the base member and performs seismic isolation. The side cover is pushed from the inside to the outside during the seismic isolation operation by the vibration energy cutoff device, and the side cover swings. The side cover can be swung with a small amount of force, and the seismic isolation effect is hardly lowered by providing the side cover. When the vibration energy shut-off device returns to the original position, the side cover also returns to the original hanging state.

It is a perspective view which shows the usage example of the Example of the base isolation table which concerns on this invention. It is a perspective view of the Example of the said base isolation table. It is a front view of the Example of the said base isolation table. It is front sectional drawing of the Example of the said base isolation table. It is front sectional drawing which shows the one operation | movement aspect of the Example of the said base isolation table. It is an expanded front sectional view which shows the principal part of the Example of the said base isolation table. It is a top view which shows another operation | movement aspect of the Example of the said base isolation table. It is a bottom view which shows the mounting table in the said Example. It is a bottom view which shows another example of the mounting table applicable to this invention. It is a perspective view which shows the usage example of another Example of the base isolation table which concerns on this invention. It is front sectional drawing which shows a part of another Example of the base isolation table which concerns on this invention. It is front sectional drawing which shows the operation | movement aspect of the said Example of the base isolation table which concerns on this invention. It is front sectional drawing which shows another Example of the base isolation table which concerns on this invention. It is a disassembled perspective view which shows the example of the conventional base isolation table. It is an expanded front sectional view which shows the principal part of the said conventional base isolation table.

  Hereinafter, embodiments of the base isolation table according to the present invention will be described with reference to the drawings.

  In FIG. 1, the seismic isolation table 100 is installed on an exhibition table 400, and an article 300 such as a work of art or an antique is placed on the base isolation table 100. The display case 400 is covered with a transparent case 200. The transparent case 200 covers the periphery of the article 300, and the article 300 can be observed from the outside through the transparent case 200.

  As shown in FIGS. 2 and 3, the seismic isolation table 100 has an upper surface covered with a mounting table 124, and can place an article on the mounting table 124. The mounting table 124 has a square planar shape, and side covers 132 are arranged on the four surrounding sides. Each side cover 132 functions as a blindfold so that the internal structure of the base isolation table 100 is not visible, and also has a role of aesthetically adjusting the appearance of the base isolation table 100.

  On the lower surface side of the four corners of the mounting table 124, short square columnar bearing blocks 128 are integrally provided. The bearing block 128 may be made of plastic or the like. A shaft 130 is held in a horizontal direction between a pair of bearing blocks 128 facing each other on the four side edges of the mounting table 124. The side covers 132 are supported by these shafts 130, respectively. Each side cover 132 is suspended so as to be rotatable about a shaft 130 at the top of the side cover. The side cover 132 is made of a rectangular plate-like member that can cover the side opening of the base isolation table 100. The upper portions at both ends in the length direction of the side cover 132 are cut off at right angles so as to escape from the bearing block 128.

  The base isolation table 100 includes a vibration energy cutoff device below the mounting table 124. Hereinafter, a specific configuration of the vibration energy cutoff device will be described with reference to FIGS. 4 to 7. The base isolation table 100 has a square plate-like base member 102, and a bottom plate 104 is attached to the upper surface of the base member 102. On the bottom plate 104, a first linear movement mechanism mainly including a slide rail 105 is attached. The slide rail 105 includes an outer rail 106, an inner rail 107, a retainer and a ball interposed between the outer rail 106 and the inner rail 107, similarly to the conventional slide rail shown in FIGS. 19 and 20. The configuration of the slide rail 105 is the same as the configuration of the slide rail 110 described later.

  The slide rails 105 are arranged parallel to each other at both side edges of the bottom plate 104, and two slide rails 105 are arranged as a set at each side edge. Each slide rail 105 is fixed on the bottom plate 104 with the outer surface of the outer rail 106 serving as a bottom surface, and the outer surface of the inner rail 107 serving as a top surface to which a first movable base 108 having a square shape is coupled. Yes. In each slide rail 105, an outer rail 106 and an inner rail 107 are relatively movable in the longitudinal direction. Therefore, the first movable base 108 can move in the horizontal direction in the direction parallel to the paper surface in FIG. 6 with respect to the base member 102.

  A second linear movement mechanism mainly composed of a plurality of slide rails 110 is attached on the first movable base 108. The slide rails 110 are arranged in parallel with each other on both side edges of the first movable base 108 and in pairs on each side edge of the first movable base 108. As shown in FIG. 6, each slide rail 110 has an outer rail 112 in which both side edges in the width direction are bent upward in a semicircular cross section, and both side edges in the width direction are bent in a semicircular cross section. An inner rail 114 is provided. The inner rail 114 is positioned inward of the outer rail 112, and a bent edge on both sides of the outer rail 112 and a bent edge on both sides of the inner rail 114 form a space having a circular cross section. An appropriate number of balls 118 are interposed in the space having a circular cross section, and each ball 118 is held by a retainer 116 interposed between the inner and outer rails 112 and 114.

  Each slide rail 110 constituted by the inner and outer rails 112 and 114, the retainer 116, and the ball 118 is fixed on the first movable base 108 with the outer surface of the outer rail 112 serving as a bottom surface. Further, the outer surface of the inner rail 114 is an upper surface, and a square-shaped second movable base 120 is coupled to the upper surface. In each slide rail 110, an outer rail 112 and an inner rail 114 are relatively movable in the longitudinal direction. Therefore, the second movable base 120 can move straight in the direction perpendicular to the paper surface in FIG. 6 with respect to the first movable base 108. In each slide rail 110, the positional relationship between the outer rail 112 and the inner rail 114 may be upside down. The slide rail 105 constituting the first linear movement mechanism may also be upside down in the positional relationship between the inner and outer rails.

  A mounting table 124 having a substantially square planar shape is placed on the second movable table 120. As already described, the mounting table 124 integrally has bearing blocks 128 on the lower surface sides of the four corners. As shown in FIG. 8, a spacer 125 in which a window hole-shaped gap 148 of various shapes and sizes is formed is fixed to the lower surface of the mounting table 124. The outer shape of the spacer 125 is a square shape smaller than the mounting table 124. On the lower surface side of the mounting table 124, a position regulating member 126 is attached along each outer surface of the four sides of the spacer 125. The position regulating member 126 is shorter than the length of each outer side of the spacer 125. The lower end of the position regulating member 126 projects below the lower surface of the spacer 125.

  When the mounting table 124 is put on the second movable table 120, the position restricting member 126 descends along the respective outer surfaces of the four sides of the second movable table 120, and the mounting table with respect to the second movable table 120. The horizontal relative positional relationship 124 is determined. The relative positional relationship in the vertical direction of the mounting table 124 with respect to the second movable table 120 is determined by the lower surface of the spacer 125 hitting the upper surface of the second movable table 120. When the mounting table 124 is positioned and covered on the second movable table 120 in this way, the side cover 132 suspended by the shaft 130 on the four sides of the mounting table 124 hangs down along the gravity. The side cover 132 surrounds the space between the base member 102 and the mounting table 124 and serves as a blindfold for the internal mechanism of the base isolation table 100.

  The plurality of slide rails 105 and 110 constituting the first and second linear movement mechanisms constitute a vibration energy cutoff device that blocks transmission of vibration energy from the base member 102 side to the mounting table 124. Yes. The vibration energy shut-off device is configured by arranging a plurality of slide rails in a direction orthogonal to each other so that the mounting table 124 can move in all directions within a horizontal plane. The vibration energy cutoff device has an origin return member for returning the first and second movable bases 108 and 120 moved by the seismic isolation operation to the origin. “Seismic isolation operation” refers to the operation of the vibration energy cutoff device, that is, the vibration energy cutoff operation.

  FIG. 7 shows a coil spring 140 which is an origin return member for returning the second movable table 120 and the mounting table 124 to the origin after the vibration energy blocking operation, and a spring hook 142 and a holding member 144 thereof. The constituent parts including the coil spring 140, the spring hook 142, and the holding member 144 are not significantly different from the structure of the conventional example shown in FIG. Although only one end side of the coil spring 140 is shown in FIG. 7, the other end side of the coil spring 140 is also supported by a similar spring hook 142 and a holding member 144 that holds the spring hook 142. The coil spring 140 is provided between the slide rails 110 paired on both sides.

  When the second movable base 120 moves in one direction by the slide rail 110 with respect to the first movable base 108, an engagement member (not shown) of the second movable base 120 engages with the spring hook 142, and the spring hook 142. Push to move outward. In the example shown in FIG. 7, the spring hook 142 that is hidden by the mounting table 124 is pushed outward, and the coil spring 140 is expanded and stored. The second movable table 120 and the mounting table 124 can be returned to the origin by the stored force of the coil spring 140. When the mounting table 124 moves downward along with the second movable table 120, as opposed to the mode shown in FIG. 7, the engaging member of the second movable table 120 holds the spring hook 142 shown on the lower side in FIG. It moves away from the member 144 and moves downward in FIG. The coil spring 140 is extended to accumulate the return force to the origin of the second movable table 120 and the mounting table 124.

  Also between the base member 102 and the first movable base 108, an origin for returning the first movable base 108, which is moved by the slide rail 105, which is a first linear movement mechanism, to the base member 102 to the origin. A return member is provided. Although the origin returning member is not shown, it is constituted by a coil spring as described above, and this coil spring is supported by a spring hook and a holding member, as in the example shown in FIG. And the engaging member provided in the 1st movable stand 108 engages with the said spring hook, and is comprised so that a coiled spring may be stored.

  Each side cover 132 provided around the mounting table 124 is in the moving path of the slide rail 105 or the slide rail 110 during the seismic isolation operation by the vibration energy cutoff device including the slide rails 105 and 110. In the example shown in FIG. 6, when the first movable table 108, the mounting table 124, and the side cover 132 move to the right together with the inner rail 107 of the slide rail 105, the slide rail 105 is inserted into the movement path of the left side cover 132. There are outer rails 106. Therefore, the inner surface of the side cover 132 hits the outer rail 106, and the side cover 132 is pushed from the inside to the outside and swings about the shaft 130. The side cover 132 can swing with an extremely small amount of force, and does not hinder the seismic isolation operation caused by the slide of the slide rail 105.

  When the first movable base 108 moves to the left in FIG. 6, the right side cover 132 hits the outer rail 106 of the slide rail 105 and swings. While the first movable base 108 is moving relative to the base member 102 due to an earthquake or the like, the lower end edge of the side cover 132 is in contact with the upper surface of the outer rail 106, and the lower end edge of the side cover 132 is the outer rail 106. Move while sliding on the top surface. When vibration due to an earthquake or the like converges, the first movable base 108 returns to the origin, and the side cover 132 also returns to a state in which it hangs down in the direction of gravity, thereby blinding the internal mechanism of the base isolation table 100.

  The origin return member formed of a coil spring is within the height range of the slide rail 105, which is a linear movement mechanism, and the overall height of the base isolation table 100 is suppressed. As shown in FIG. 4, a stopper 146 that defines the movement limit of the mounting table 124 during the vibration energy blocking operation is provided between the pair of slide rails 105. The stopper 146 is also within the height range of the slide rail 105. Therefore, when the vibration energy is interrupted by moving the lower end edge of the side cover 132 in contact with the upper surface of the outer rail 106, the origin return member and the stopper 146 and the side cover 132 do not interfere with each other, and the movement is smoothly performed. Done.

  When the second movable base 120 moves in the direction orthogonal to the paper surface in FIG. 6 with respect to the first movable base 108, the side cover 132 hits the outer rail 112 of the slide rail 110, and the side cover 132 swings. To do. FIG. 7 shows a state where one side cover 132 is swinging. As shown in FIG. 7, when the mounting table 124 moves together with the second movable base 120 to perform a seismic isolation operation, the side cover 132 moves while its lower edge slides on the upper surface of the outer rail 112. The operation of the side cover 132 is the same as the operation of the side cover 132 by the movement of the first movable base 108 described above.

  A coil spring 140 constituting the origin return member of the second movable table 120 and the mounting table 124 is depicted in FIG. The end of the coil spring 140 is coupled to the central portion in the length direction of the spring hook 142. Both end portions in the length direction of the spring hook 142 are held by holding members 144. The stoppers that define the movement limits of the coil spring 140, the spring hook 142, the holding member 144, and the mounting table 124 are within the height range of the slide rail 110, which is a linear movement mechanism, and the overall height of the base isolation table 100 is suppressed. ing. The lower end edge of the side cover 132 slides on the upper surface of the outer rail 112 during the vibration energy blocking operation. The side cover 132 smoothly slides without interfering with the origin return member and the stopper.

  As shown in FIGS. 4, 8, and the like, the spacer 125 arranged in an inward direction of the mounting table 124 is formed with a window hole-like gap 148 of various shapes and sizes. In the gap 148, a weight whose weight is adjusted so as to obtain the maximum seismic isolation effect according to the weight of the article placed on the base isolation table 100 may be stored. Alternatively, an insect repellent may be stored in order to protect artworks, antiques, and the like from pests, and humidity control agents, fragrances, and the like may be stored.

  The positioning of the mounting table 124 with respect to the second movable base 120 may be configured by a boss and its receiving hole. FIG. 9 shows an example, and an appropriate number of bosses 150 are formed on the spacer 125 fixed to the mounting table 124 on the mounting table 124 side. These bosses 150 are fitted into receiving holes formed in the second movable table 120 so that the mounting table 124 is positioned and coupled to the second movable table 120.

  According to the embodiment of the base isolation table described above, the side cover that is blinded to the internal mechanism of the base isolation base is suspended so as to be rotatable around the axis at the side edge of the mounting table, and during the vibration energy shutoff operation. The side cover is pushed outward and swings. Since the amount of force required for the swinging of the side cover is small, the swinging of the side cover does not hinder the seismic isolation effect. When the vibration converges and the operation mode of the base isolation table is returned to the origin, the side cover automatically returns to the original operation mode, so that a manual return operation is unnecessary.

  The first embodiment described so far has a configuration in which a mounting table is mounted on the base isolation table 100. The embodiment shown in FIG. 10 does not have a mounting table, and has a configuration in which a transparent case 200 as an display case is placed on the display stand 400 and the display stand 400 is placed on a relatively large seismic isolation table 500.

  The base isolation table 500 includes a vibration energy cutoff device having a structure similar to that of the vibration energy cutoff device provided in the first embodiment. The vibration energy cutoff device includes a first linear movement mechanism and a second linear movement mechanism that are formed of slide rails that are movable in directions perpendicular to each other in the vertical direction. The display stand 400 is placed on the vibration energy shut-off device composed of the first and second linearly moving mechanisms. Therefore, when an earthquake occurs, the transmission of the seismic energy to the display stand 400 is blocked by the vibration energy blocking device, and the displayed article 300 is prevented from falling.

  Around the seismic isolation table 500, the following side covers that are blindfolded for the vibration energy shut-off device are attached. Since the first linear moving mechanism is below the second linear moving mechanism, side covers 152 and 154 are attached to the lower part of the base isolation table 500. Since the first linear movement mechanism is movable in the left-right direction (Y direction), the front side and the side cover 152 on the back side (not shown) are fixed. The side cover 154 on the right side and the left side (not shown) is suspended so as to be rotatable about the upper shaft of the side cover 154.

  Since the second linear movement mechanism is on the upper side of the first linear movement mechanism, side covers 156 and 158 are attached to the upper part of the base isolation table 500. Since the second linear movement mechanism is movable in the front-rear direction (X direction), the side cover 156 on the front side and the back side (not shown) is suspended so as to be rotatable around the upper axis of the side cover 156. ing. The side cover 158 on the right side and the left side (not shown) is fixed.

  Also in the base isolation table according to the second embodiment shown in FIG. 10, each swingable side cover operates in the same manner as the side cover in the first embodiment, and the same effect as the base isolation table according to the first embodiment is obtained. be able to.

  An embodiment in which the operation of the side cover is lightened and the seismic isolation effect is further enhanced is shown in FIGS. This embodiment is different from the embodiments shown in FIGS. 4, 5 and 6 in that the side cover 132 has a roller 134 as a rolling member at the lower end. The roller 134 is supported on the inner surface side of the side cover 132 so as to be rotatable about a horizontal axis. The roller 134 is in a position where it can roll on the upper surface of the outer rail 106 of the slide rail 105 in the length direction of the side cover 132 during the seismic isolation operation of the vibration energy cutoff device of the base isolation table 100.

  11 and 12, only the left and right side covers 132 are depicted, but the side covers 132 are also formed in a direction perpendicular to the paper surface of FIGS. 11 and 12 (hereinafter, this direction is referred to as “front-rear direction”). Is suspended so as to be rotatable about the upper shaft. A roller having the same configuration as the roller 134 is also supported by the side cover 132 in the front-rear direction. The roller of the side cover 132 in the front-rear direction is in a position where it can roll on the upper surface of the outer rail 112 of the slide rail 110 in the length direction of the side cover 132 during the base isolation operation of the base isolation table 100.

  More specifically, two slide rails 110 are paired, and two pairs of slide rails are on both side edges of the first movable base 108. The outer rail 112 of each pair of slide rails 110 rises at both side edges and bends inward from each other, and has a flat upper end surface. The position of the roller is determined with respect to the side cover 132 so that the roller of the side cover 132 in the front-rear direction contacts the upper surface 115 (see FIG. 7) of the outer rail 112 adjacent to each other. During the base isolation operation of the base isolation table 100, the side cover 132 is pushed from the inside toward the outside and swings, and the roller rolls on the upper surface 115 of the outer rail 112.

  The rollers 134 of the left and right side cover 132 shown in FIGS. 11 and 12 roll on the upper surface of the slide rail 105 constituting the first linear movement mechanism. Similarly to the slide rail 110, the two slide rails 105 are paired, and the two pairs of slide rails 105 are arranged on both side edges of the bottom plate 104. The roller 134 rolls on the upper surface of the outer rail 106 that forms two pairs of slide rails 105 and is adjacent to each other.

  According to the embodiment shown in FIGS. 11 and 12, when the side cover 132 is pushed from the inside toward the outside and swings during the base isolation operation of the base isolation table 100, the roller 134 constitutes a slide rail. Roll on the top surface of the outer rail. The rolling resistance of the roller 134 at this time is smaller than the resistance when the side cover 132 slides on the rail surface, and the seismic isolation effect is enhanced.

  As can be seen from FIG. 12, when the roller 134 rolls on the upper surface of the outer rail, the lower end of the side cover 132 is lifted above the upper surface of the outer rail. The restriction that the coil spring 140, the spring hook 142, the holding member 144 and the like constituting the origin returning device have to be lower than the upper surface of the rail is eliminated, and the design of the base isolation table becomes easy.

  FIG. 13 shows still another embodiment of the base isolation table according to the present invention. In FIG. 13, there are side covers 232 at the four side edges of the mounting table 224. Although a specific configuration is not described in FIG. 13, each side cover 232 is suspended from a side edge of the base isolation table so as to be rotatable about an upper axis of the side cover. . Each side cover 232 is pushed and swayed from the inside to the outside during the seismic isolation operation, that is, the vibration energy cutoff operation of the vibration energy cutoff device.

  Each side cover 232 is a quadrangular prism-like member having a length necessary for blinding the vibration energy blocking device and a vertical width. Each side cover 232 moves while sliding in contact with the upper surface of the vibration energy cutoff device, specifically, the upper surface of the outer rail constituting the slide rail, during the seismic isolation operation. Each side cover 232 is made of a slippery material such as polypropylene or polycarbonate.

  According to the embodiment shown in FIG. 13, during the base isolation operation, the sliding resistance between the side cover 232 and the upper surface of the vibration energy cutoff device is reduced, and the seismic isolation effect by the vibration energy cutoff device is increased accordingly.

A modification of the embodiment shown in FIG. 13 is shown below.
The entire side cover 232 does not need to be made of a slippery material, and at least a portion that slides in contact with the vibration energy shut-off device only needs to be made of a slippery member.

In the example illustrated in FIG. 13, the placement table 224 is covered with the decorative cover 226, but the decorative cover 226 may not be provided.
When the mounting table 224 is covered with the decorative cover 226, the side cover 232 can be rotatably supported by the peripheral edge of the decorative cover 226.

[Other variations]
The planar shape and size of the base isolation table are arbitrary. The planar shape may be a rectangle. The planar shape of the mounting table may be a circle, an ellipse, or any other shape. As long as the constituent requirements of the invention according to each claim are satisfied, the design can be changed as appropriate.

100 base isolation table 102 base member 104 bottom plate 105 slide rail (first linear movement mechanism)
108 First movable stand 110 Slide rail (second linear movement mechanism)
112 Outer rail 114 Inner rail 116 Retainer 118 Ball 120 Second movable base 124 Mounting table 126 Position restricting member 128 Bearing block 130 Shaft 132 Side cover 140 Origin return member (coil spring)
142 Spring hook 144 Holding member 400 Exhibition stand 500 Seismic isolation base

Claims (8)

A base member, and a vibration energy blocking device that is mounted on the base member and blocks transmission of vibration energy on the base member side. Is a base-isolated table,
It has a side cover that is a blindfold for the vibration energy shut-off device,
The side cover is rotatable about the axis of the upper part of the side cover so as to swing when pushed from the inside to the outside during the vibration energy cutoff operation of the vibration energy cutoff device. A base isolation table that is suspended from the side edge of the base isolation base. A base member, and a vibration energy blocking device that is mounted on the base member and blocks transmission of vibration energy on the base member side. A base isolation table having a mounting table for mounting
It has a side cover that is a blindfold for the vibration energy shut-off device,
The side cover is rotatable about the axis of the upper part of the side cover so as to swing when pushed from the inside to the outside during the vibration energy cutoff operation of the vibration energy cutoff device. A base isolation table that is suspended from the side edge of the base isolation base.   3. The base isolation table according to claim 1, wherein the side cover moves in contact with the vibration energy cutoff device during the vibration energy cutoff operation of the vibration energy cutoff device.   3. The base isolation table according to claim 1, wherein the side cover moves while sliding in contact with the vibration energy cutoff device during the vibration energy cutoff operation of the vibration energy cutoff device.   The seismic isolation table according to claim 4, wherein at least a portion of the side cover that moves while being in contact with the vibration energy shut-off device is made of a slippery member.   The base isolation table according to claim 1, wherein the side cover includes a rolling member that rolls in contact with the vibration energy cutoff device.   The seismic isolation table according to any one of claims 1 to 6, wherein the vibration energy cutoff device has a linear movement mechanism mainly composed of rails.   The base table according to any one of claims 2 to 7, wherein the placing table has a gap in which an article can be stored.