Horizontal uniaxial seismic isolation device

Abstract

To provide a small and inexpensive horizontal uniaxial seismic isolation device that can move only in the horizontal uniaxial direction and obtain limited seismic isolation performance. [Solution] The system includes a lower plate (1) installed at the location of the seismically isolated structure; a pair of side plates (3) erected at opposing ends of the lower plate; an upper plate (2) positioned above the lower plate and on which the seismically isolated structure is placed; a displacement means (4) interposed between the lower and upper plates and displacing the upper plate in one horizontal direction relative to the lower plate; a guide means (4) for assisting the displacement of the upper plate; and a deviation prevention and overturn prevention means (6) for assisting the displacement of the upper plate. The displacement means may be composed of multiple rolling shafts and may include a rotary damper. The upper surface of the lower plate may be formed in an upwardly concave arc shape, and the lower surface of the upper plate may be formed in a downwardly convex arc shape. Furthermore, a rolling stabilization member (5) for braking the operation of the displacement means by frictional force may be provided on at least a portion of the upper surface and the lower surface of the lower plate.

Description

[Technical Field]

[0001] The present invention relates to a small, inexpensive seismic isolation device that can achieve limited seismic isolation performance by moving only in a single horizontal axis. More specifically, it relates to a seismic isolation device that prevents an object (seismically isolated body) from falling or tipping over due to earthquakes or vibrations, thereby preventing damage or breakage to the object. [Background technology]

[0002] Seismic isolation devices have traditionally been known as devices that prevent damage or breakage caused by the toppling or falling of seismically isolated objects such as artworks, precision instruments, and computer equipment during an earthquake. These seismic isolation devices are high-performance devices that protect expensive items (seismically isolated objects) from earthquakes and vibrations, and are generally capable of moving in both directions along two horizontal axes (X and Y axes). Furthermore, in order to achieve high performance, the seismic isolation device must have a large movable stroke, which makes it a large and expensive device.

[0003] As such a seismic isolation device, for example, a seismic isolation device has been proposed that can achieve a seismic isolation effect for a seismically isolated body when an earthquake occurs by utilizing the relative movement of seismic isolation rails arranged above and below (see Patent Documents 1 and 2).

[0004] However, depending on the object (isolated body) to be protected by the seismic isolation device, it may be sufficient to obtain seismic isolation performance (effect) in only one axial direction. For example, in the case of an object that is prone to tipping in the X direction but difficult to tip in the Y direction, such as a model train or a photo stand, it is sufficient to have seismic isolation performance that allows movement in only one horizontal axis direction, rather than a large and expensive seismic isolation device that can move in both horizontal axes directions. Also, for example, in the case of an object that needs to be prevented from falling from a shelf against a wall, but is not affected by it tipping sideways on the shelf, it is sufficient for the object to have seismic isolation performance that allows it to move only in one horizontal axis direction.

[0005] In other words, the seismic isolation device that can move in both horizontal directions as described above is desirable as it can provide high-performance seismic isolation for various seismically isolated bodies when an earthquake occurs, but depending on the object to be seismically isolated, it may be sufficient to have seismic isolation performance that can move in only one horizontal direction, and there is a demand for proposals for small, inexpensive seismic isolation devices. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5033230 [Patent Document 2] Patent No. 5677063 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention was developed in consideration of the above-mentioned conventional circumstances, and aims to provide a small, inexpensive seismic isolation device that can achieve limited seismic isolation performance by moving only in a single horizontal axis direction. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, a first aspect of the present invention is a horizontal uniaxial seismic isolation device characterized by comprising a lower plate installed at the position of the seismically isolated body, an upper plate arranged above the lower plate and on which the seismically isolated body is placed, a displacement means interposed between the lower plate and the upper plate and displacing the upper plate in one horizontal direction relative to the lower plate, a guide means for assisting the displacement of the upper plate, and a deviation prevention and overturn prevention means for assisting the displacement of the upper plate.

[0009] In other words, the horizontal uniaxial seismic isolation device of the present invention has a displacement means placed on a lower plate and an upper plate placed on said displacement means, with the displacement means sandwiched between the lower and upper plates, thereby enabling the displacement action of the upper plate to be assisted by the deviation prevention and overturning prevention means, while the displacement means displaces the upper plate horizontally in one direction relative to the lower plate, thereby achieving a seismic isolation effect.

[0010] In the above horizontal single-axis seismic isolation device, the displacement means may be configured by a plurality of rolling shafts. In this case, the rolling shaft can have a function of stabilizing frictional force so that the rolling shaft can roll without slipping. The rolling shaft may also be provided with a rotary damper.

[0011] In the above-described horizontal single-axis seismic isolation device, the lower plate may be formed in an arc shape with an upper surface recessed upward. In this case, in the above-mentioned horizontal uniaxial seismic isolation device, the upper plate can be formed in an arc shape with its lower surface protruding downward, and the upper surface of the lower plate and the lower surface of the upper plate can be formed in an arc shape with the radius of the orbit at one end of the arc different from the radius of the orbit at the other end of the arc.

[0012] Furthermore, in the above-mentioned horizontal uniaxial seismic isolation device, the guide means is composed of a lower rail provided on the upper surface of the lower plate and an upper rail provided on the lower surface of the upper plate opposite the lower rail, and the displacement means has a guided portion interposed between the lower rail and the upper rail, and the guided portion is guided by the lower rail and the upper rail, thereby displacing the upper plate relative to the lower plate.

[0013] That is, in the above-mentioned horizontal uniaxial seismic isolation device, the lower plate can have a lower rail on its upper surface as a guide means to assist the operation of the displacement means, and the upper plate can have an upper rail on its lower surface opposite the lower rail of the lower plate as a guide means to assist the operation of the displacement means.

[0014] In addition, the lower rail is arranged so that a portion of the upper surface of the lower plate protrudes toward the upper plate, and the upper rail is arranged so that a portion of the lower surface of the upper plate protrudes toward the lower plate, and the guided portion can be a small diameter portion sandwiched between the lower rail and the upper rail.

[0015] That is, in the above-mentioned horizontal uniaxial seismic isolation device, the lower rail has a portion of the upper surface of the lower plate protruding toward the upper plate, and the upper rail has a portion of the lower surface of the upper plate protruding toward the lower plate, and the displacement means can have a small diameter portion interposed between the lower rail protruding from the upper surface of the lower plate and the upper rail protruding from the lower surface of the upper plate.

[0016] Furthermore, in the above-mentioned horizontal uniaxial seismic isolation device, the deviation prevention and overturn prevention means can be composed of a guide groove along the direction in which the upper plate is displaced and a stopper pin inserted into the guide groove, and the displacement means can be configured to displace the upper plate relative to the lower plate by being guided by the stopper pin housed in the guide groove. Furthermore, in the above-mentioned horizontal single-axis seismic isolation device, the guide grooves each have a step portion that protrudes downward at one opposing end and the other opposing end of the upper plate, and are formed opposite the inner surfaces of the step portions, and the stopper pins can each be provided on the side plates protruding outward. In the horizontal single-axis seismic isolation device, the guide groove may have a notch that allows the stopper pin to be inserted.

[0017] Specifically, the horizontal uniaxial seismic isolation device of the present invention comprises a lower plate installed at the position of the seismically isolated body, an upper plate arranged above the lower plate and on which the seismically isolated body is placed, a displacement means interposed between the lower plate and the upper plate and comprising a rotary damper and consisting of a plurality of rolling shafts that displaces the upper plate horizontally in one direction relative to the lower plate, a guide means for assisting the displacement of the upper plate, and an anti-skid and anti-tip means for assisting the displacement of the upper plate, and the lower plate can be formed in an arc shape with its upper surface concave upward.

[0018] In addition, the horizontal uniaxial seismic isolation device of the present invention specifically comprises a lower plate installed at the position of the seismically isolated body, an upper plate arranged above the lower plate and on which the seismically isolated body is placed, a displacement means interposed between the lower plate and the upper plate and comprising a rotary damper composed of a plurality of rolling shafts that displaces the upper plate in a horizontal direction relative to the lower plate, a guide means for assisting the displacement of the upper plate, and an anti-departure and anti-tip means for assisting the displacement of the upper plate, wherein the lower plate has an upper surface formed in an arc shape that is concave upward, and the upper plate has a lower surface formed in an arc shape that protrudes downward, and the upper surface of the lower plate and the lower surface of the upper plate are formed in an arc shape in which the radius of the orbit at one end of the arc is different from the radius of the orbit at the other end of the arc. [Effects of the Invention]

[0019] The seismic isolation device of the present invention uses displacement means to suppress the transmission of unidirectional vibrations from the lower plate to the upper plate, which could cause the seismic isolation body to collapse due to an earthquake or vibration, making it difficult for the seismic isolation body to collapse. Therefore, it is possible to provide a small, inexpensive seismic isolation device that can achieve limited seismic isolation performance by moving only in one horizontal axis direction. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic perspective view of a horizontal single-axis seismic isolation device according to the present invention; [Figure 2] 1 is a schematic development view illustrating the configuration of a horizontal single-axis seismic isolation device according to the present invention. [Figure 3] 1 is a schematic side central longitudinal cross-sectional view illustrating the configuration of a horizontal uniaxial seismic isolation device according to the present invention. [Figure 4] 1 is a schematic perspective view showing a lower plate constituting a horizontal uniaxial seismic isolation device according to the present invention; [Figure 5] 1A and 1B are a schematic perspective view of the upper plate constituting the horizontal uniaxial seismic isolation device according to the present invention; [Figure 6] 1 is a schematic perspective view showing a displacement means (rolling shaft) constituting the horizontal single-axis seismic isolation device according to the present invention. FIG. [Figure 7] 4 is a schematic cross-sectional view of the horizontal uniaxial seismic isolation device shown in FIG. 3 taken along line II. [Figure 8] 4 is a schematic cross-sectional view of the horizontal single-axis seismic isolation device shown in FIG. 3 taken along line II-II. [Figure 9] 1 is a schematic front central vertical cross-sectional view illustrating the operation of the horizontal single-axis seismic isolation device according to the present invention. FIG. [Figure 10] FIG. 2 is a schematic front central vertical cross-sectional view illustrating another horizontal uniaxial seismic isolation device according to the present invention. [Figure 11] 1 is a schematic side view illustrating another horizontal single-axis seismic isolation device according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] An example of an embodiment of a horizontal single-axis seismic isolation device according to the present invention will be described below with reference to the drawings. The device of this invention has seismic isolation performance that can move only in a horizontal direction, making it suitable for objects such as model trains and photo stands that are prone to tipping in the X direction but difficult to tip in the Y direction, or objects that need to be prevented from falling off a shelf against a wall but do not need to tip sideways on the shelf.

[0022] The embodiments described below are preferred examples of the present invention and are therefore subject to various technical limitations. However, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

[0023] 1 to 3, the horizontal uniaxial seismic isolation device 10 of this embodiment comprises at least a lower plate 1, an upper plate 2, and a displacement means 4. That is, the upper plate 2 is disposed on the lower plate 1, and the displacement means 4 is disposed between the lower plate 1 and the upper plate 2.

[0024] It is desirable that this horizontal uniaxial seismic isolation device 10 be provided with guide means for assisting the displacement of the upper plate. That is, in this embodiment, guide means are provided on the upper surface of the lower plate 1 and the lower surface of the upper plate 2, respectively. Furthermore, it is desirable that the horizontal uniaxial seismic isolation device 10 is provided with rolling stabilization members 5. That is, in this embodiment, the rolling stabilization members 5 are disposed between the lower plate 1 and the displacement means 4, and between the upper plate 2 and the displacement means 4, respectively.

[0025] As shown in Fig. 4, the lower plate 1 is a member that is installed at the location of the seismic isolation body, and has an upper surface 11 formed in the shape of an arc recessed upward along one axis direction. That is, the upper surface 11 may be flat, but it is preferable that it be formed in the shape of a concave arc recessed upward, with the end 11e side being higher than the vicinity of the center 11c in one axis direction, as indicated by the arrow line X in Fig. 4. Conversely, it is preferable that the vicinity of the center 11c in one axis direction X is lower than the end 11e side.

[0026] In this way, by forming the upper surface 11 of the lower plate 1 in a concave arc shape, the displacement means 4 placed on the upper surface 11 of the lower plate 1 oscillates in an arc-shaped trajectory along the uniaxial direction X on the upper surface 11 of the lower plate 1, and can obtain a restoring force that returns from a high position to a low position on the arc. That is, even if the displacement means 4 moves from the vicinity of the center 11c of the concave arc shape toward the end 11e due to shaking caused by an earthquake or vibration, the end 11e is higher than the vicinity of the center 11c, so the displacement means 4 moves to the vicinity of the center 11c, which is lower due to gravity. Furthermore, as the displacement means 4 moves, the upper plate 2 also moves and returns to its original position.

[0027] Furthermore, the arc-shaped track makes it possible to realize a seismic isolation device that prevents damage caused by tipping or falling of the seismically isolated body within a limited size (smaller range of movement). In FIG. 4, the lower plate 1 is shown as having a horizontally elongated rectangular shape when viewed from above.

[0028] Furthermore, it is desirable that the lower plate 1 is provided with a lower rail 12 on the upper surface 11 as a guide means, which assists the operation (displacement) of the displacement means 4. This lower rail 12 is a portion on which a small diameter portion 47 of a rolling shaft 41, which will be described later as the displacement means 4, is placed, and a part of the upper surface 11 of the lower plate 1 protrudes toward the upper plate 2. This lower rail 12 ensures that the movement of the displacement means 4 on the upper surface 11 of the lower plate 1 is stable and undisturbed.

[0029] It is also desirable that the lower plate 1 be provided with side plates 3···3 that stand upright at each peripheral end surface. The side plates 3 may be fixedly attached to the lower plate 1, or may be formed integrally with the lower plate 1. In FIG. 4, the side plates 3 are shown as being fixedly attached to the bottom plate 1 .

[0030] As shown in Fig. 5, the upper plate 2 is a member disposed above the lower plate 1 on which the seismic isolated body is placed, and has a lower surface 21 formed in an arc shape that protrudes downward along one axial direction. That is, the lower surface 21 of the upper plate 2 may be flat, but it is desirable that the lower surface 21 of the upper plate 2 be formed in a convex arc shape that is a downward arc, with the vicinity of the center 21c in one axial direction indicated by the arrow line X in Figs. 5(A) and (B) protruding downward from the end portion 21e side, so as to correspond to the upper surface 11 of the lower plate 1. This allows the displacement means 4 to operate smoothly between the upper surface 11 of the lower plate 1 and the lower surface 21 of the upper plate 2, making it possible to displace the upper plate 2 more stably. In FIG. 5, the upper plate 2 is shown as having a rectangular shape in plan view.

[0031] Furthermore, it is desirable that the upper plate 2 has an upper rail 22 on its lower surface 21 as a guide means, facing the lower rail 12 of the lower plate 1 and assisting the operation of the displacement means 4. Similar to the lower rail 12 of the lower plate 1, this upper rail 22 has a part of its lower surface 21 protruding toward the lower plate 1 side so as to correspond to a small diameter portion 47 of a rolling shaft 41, which will be described later as the displacement means 4. That is, the rolling shaft 41 has a small diameter portion 47 as a guided portion interposed between the lower rail 12 and the upper rail 22, and by guiding the small diameter portion 47 between the lower rail 12 and the upper rail 22, the guiding means assists the operation of the displacement means 4 to displace the upper plate 2 relative to the lower plate 1. In this way, the upper rail 22 as a guide means, in combination with the lower rail 12 as a guide means, helps the displacement means 4 to move stably without disturbance on the upper surface 11 of the lower plate 1.

[0032] The horizontal uniaxial seismic isolation device 10 is equipped with deviation prevention and overturn prevention means 6, which is composed of a guide groove that follows the direction in which the upper plate 2 is displaced, and a stopper pin that is inserted into the guide groove. In other words, the lower plate 1 and the upper plate 2 are assembled together by inserting the stopper pin into the guide groove. The deviation prevention and overturn prevention means 6 is guided by the stopper pin housed in the guide groove, and assists the displacement means 4 in displacing the upper plate 2 relative to the lower plate 1.

[0033] This deviation prevention and tip-over prevention means 6 can be, for example, provided with stopper pins 31 on a side plate 3a erected on one end surface 1a of the lower plate 1 and a side plate 3b erected on the other opposite end surface 1b, and with guide grooves 23 provided on one opposite end 2a and the other opposite end 2b of the upper plate 2. That is, the stopper pins 31 provided on the side plates 3a and 3b are inserted into and guided by the guide grooves 23, 23 provided on one end 2a and the other end 2b of the upper plate 2, respectively.

[0034] The stopper pins 31 can be provided by providing upstanding pieces 32 that protrude upward on the upper surfaces of the side plates 3a and 3b, respectively, and protruding outward from the upstanding pieces 32. In Figure 4, the stopper pin 31 is shown as being arranged to protrude outward in the end face direction from an upright piece 32 arranged at the midpoint of the length direction (i.e., axial direction X) of the side plate 3a and the side plate 3b.

[0035] On the other hand, guide grooves 23 can be formed by providing thick stepped portions 25 that protrude downward and hang down at one end 2a and the other end 2b of upper plate 2, and by forming guide grooves 23 facing the inner surfaces of these stepped portions 25. These guide grooves 23 have a shape that corresponds to the shape of upper surface 11 of lower plate 1, and if upper surface 11 of lower plate 1 is formed in a concave arc shape that is an arc recessed upward, then guide grooves 23 will also be formed in a similarly concave arc shape. The guide groove 23 is formed in a horizontally elongated elliptical shape with one end side 23a and the other end side 23b both closed. In FIG. 5, the guide groove 23 is shown as being formed in a horizontally elongated elliptical shape along the horizontal direction of the upper plate 2 (that is, the axial direction X).

[0036] The deviation prevention and tipping prevention means 6, which is constituted by such guide groove 23 and stopper pin 31, displaces the upper plate 2 relative to the lower plate 1 by sliding along the guide groove 23 guided by the stopper pin 31 in accordance with the operation of the displacement means 4. Moreover, the stopper pin 31 fits within the guide groove 23, thereby limiting the movable range of the upper plate 2, and when the stopper pin 31 abuts against the closed one end side 23a or the other end side 23b of the guide groove 23 (when the upper plate 2 reaches the end of the movable range), it is possible to prevent the upper plate 2 from rotating outward and tipping over. 1 to 3, the lower plate 1 and the upper plate 2 are shown as being combined one above the other so that the anti-skid and anti-tip means 6 can function.

[0037] Furthermore, the guide groove 23 has a notch 24 that allows the stopper pin 31 to be inserted. This notch 24 is a portion that opens up a portion of the guide groove 23. Therefore, by aligning the positions of the stopper pin 31 and the notch 24, the lower plate and the upper plate 2 can be easily assembled. On the other hand, after the lower plate and the upper plate 2 are assembled, when the positions of the stopper pin 31 and the guide groove 23 are aligned, the upper plate 2 can be removed by lifting it upward.

[0038] 5, the notch 24 is shown as being provided at a midpoint in the length direction (i.e., in the axial direction X) of the guide groove 23. Therefore, when the upper plate 2 is displaced relative to the lower plate 1 (not positioned at the center), the guide groove 23 catches on the stopper pin 31, preventing the upper plate 2 from falling off the side plate 3 (lower plate 1). On the other hand, when the upper plate 2 is positioned at the center relative to the lower plate 1, the stopper pin 31 can be removed by removing the notch 24.

[0039] In this embodiment, the stopper pin 31 is provided so as to protrude outward in the end face direction from an upright piece 32 provided at the midpoint of the length direction (i.e., in the axial direction X) of the side plate 3a and the side plate 3b, and the guide groove 23 is shown as being formed opposite the inner surfaces of the step portions 25 provided so as to protrude downward at one end 2a and the other end 2b of the upper plate 2, but is not limited to this.

[0040] Therefore, the stopper pin 31 may be provided on an upright piece 32 that is provided at a position offset from the midpoint in the longitudinal direction of the side plates 3a and 3b. This makes it possible to prevent the upper plate 2 from coming off the lower plate 1 even if it is lifted when the horizontal single-axis seismic isolation device 10 is moved. In other words, when the upper plate 2 is not displaced and is positioned at the center relative to the lower plate 1, lifting the upper plate 2 removes the stopper pin 31 from the notch 24, allowing the upper plate 2 to be removed; however, by shifting the position of the stopper pin 31 from the midpoint in the longitudinal direction of the side plates 3a and 3b, it is possible to prevent the upper plate 2 from being easily removed.

[0041] The stopper pin 31 may be provided so as to protrude inward in the end face direction from an upright piece 32 provided at the midpoint in the length direction of the side plates 3a and 3b, and the guide groove 23 may be provided on the outer surface (end face) of one end 2a and the other end 2b of the upper plate 2. This allows the overall height of the horizontal uniaxial seismic isolation device 10 to be lowered and made more stable.

[0042] The stopper pins and guide grooves may be provided in the reverse order. That is, guide grooves may be provided facing each other on the inner surfaces of side plates 3a and 3b, and stopper pins may be provided on the outer surfaces (end faces) of one end 2a and the other end 2b of upper plate 2. This makes it easier to form the guide grooves and attach the stopper pins.

[0043] As shown in Fig. 6, the displacement means 4 is a support member that is interposed between the lower plate 1 and the upper plate 2 and displaces the upper plate 2 in one horizontal direction relative to the lower plate 1 (i.e., in one axial direction indicated by the arrow X in Figs. 4 and 5). This displacement means 4 can be configured, for example, with a plurality of (at least two or more) rolling shafts 41 each having an elongated cylindrical shape. In other words, the upper plate 2 is smoothly displaced in one horizontal direction relative to the lower plate 1 by the simple method of rotating the rolling shafts 41 between the lower plate 1 and the upper plate 2. The rolling shaft 41 may be an elongated cylinder having an outer diameter of 10 mm, for example.

[0044] In Figure 6, the displacement means 4 is shown as two rolling shafts 41, 41 that are appropriately spaced apart so that the distance between the centers of the rolling shafts 41 is 50 mm, for example, and are integrated at one end and the other end by connecting members 44.

[0045] It is desirable that the rolling shaft 41 has a function of stabilizing the frictional force so that the rolling shaft 41 can roll without slipping. The function of the rolling shaft 41 to roll without slipping means that a stable friction force is generated between the rolling shaft 41 and the rolling stabilizing member 5. Such a function can be provided, for example, by using a soft material with a large coefficient of friction for the rolling stabilizing member 5.

[0046] It is desirable that the rolling shaft 41 has a braking function. The braking function means that the rotational motion of the rolling shaft 41 is damped. Such a function can be provided, for example, by using a rotary damper 42. The rotary damper 42 has a function of reducing (damping) the rotational speed by utilizing a braking force (braking force) generated by the viscous resistance of oil.

[0047] Therefore, by attaching a rotary damper 42 to one axial end of the rolling shaft 41, the rotary damper 42 can absorb the rotational force of the rolling shaft caused by earthquakes or vibrations, thereby exerting a damping effect that stops the rotation of the rolling shaft. Therefore, in this embodiment, by using the arc-shaped track and damping effect, it is possible to realize a seismic isolation device with a limited size that prevents damage caused by an object tipping over or falling.

[0048] Furthermore, it is desirable that the rotary damper 42 be a bidirectional damper (endless damper). The rotary damper 42 may be a one-way damper, but a bidirectional damper is desirable because it has a higher damping effect and can quickly stop the rotation of the rolling shaft 41. In this case, it is desirable that the torque values on the left and right of the bidirectional damper be the same. Specifically, such a rotary damper 42 may be, for example, a rotary damper manufactured by TOK Corporation, TD101W1-25.

[0049] Furthermore, when the lower rail 12 is provided on the upper surface 11 of the lower plate 1 and the upper rail 22 is provided on the lower surface 21 of the upper plate 2, it is desirable that the rolling shaft 41 has small diameter portions 47 as guided portions interposed between the lower rail 12 and the upper rail 22. That is, as shown in Fig. 7, the small diameter portions 47 interposed so as to be sandwiched between the lower rail 12 of the lower plate 1 and the upper rail 22 of the upper plate 2 are provided near one end side and the other end side of the rolling shaft 41. FIG. 7 is a cross-sectional view of the horizontal single-axis seismic isolation device 10 shown in FIG. 3 taken along line II. As a result, the small diameter portion 47 of the rolling shaft 41 is guided by the lower rail 12 and the upper rail 22, and the rolling shaft 41 (displacement means 4) can move smoothly and reliably along the lower rail 12 and the upper rail 22.

[0050] The upper and lower rails may be recessed rather than protruding as described above. That is, the lower rail may have a lower groove formed by recessing a portion of the upper surface 11 of the lower plate 1, and the upper rail may have an upper groove formed by recessing a portion of the lower surface 21 of the upper plate 2, and a protrusion may be provided on the rolling shaft 41 (displacement means 4) as a guided portion interposed between the lower groove and the upper groove. However, in the case of a concave groove, there is a risk that dust or the like may get into the groove and impede the operation of the rolling shaft 41 (displacement means 4). Therefore, it is desirable that the lower rail and upper rail that assist the operation of the rolling shaft 41 protrude from the upper surface 11 of the lower plate 1 and the lower surface 21 of the upper plate 2, respectively.

[0051] 6, the displacement means 4 is shown as having a rotary damper 42 attached to one axial end of the rolling shaft 41, with a collar 43 interposed between the rotary damper 42 and the small diameter portion 47 of the rolling shaft 41. This collar 43 is a component used for positioning and eliminating excess space by being installed on the axial end side of the rolling shaft 41. A specific example of the collar 43 is a counterbore type resin collar, FWZJN-D10-V6-P305-H10-T12.5, manufactured by Misumi Corporation.

[0052] 3, the displacement means 4 is shown as being provided with a bushing 46 on the other axial end side of the rolling shaft 41. That is, the flanged bushing 46 is disposed between the lower rail 12 and the upper rail 22. This flanged bushing 46 may be, for example, an oil-free bushing, polyacetal resin type, JZF4-6, manufactured by Misumi Corporation.

[0053] This displacement means 4 displaces the upper plate 2 horizontally in one direction relative to the lower plate 1, and by the guidance of the stopper pin 23 of the upper plate 2 and the guide groove 31 of the side plate 3, the upper plate 1 is guided by the stopper pin 23 inserted into the guide groove 31 of the side plate 3, allowing it to be displaced smoothly.

[0054] Furthermore, the horizontal single-axis seismic isolation device 10 desirably includes a rolling stabilization member 5 that brakes the movement of the rolling shaft 41 by frictional force on at least a portion of the upper surface 11 of the lower plate 1 and / or at least a portion of the lower surface 21 of the upper plate 2. The rolling stabilization member 5 can be, for example, a rubber sheet or elastomer sheet with a large (high) coefficient of friction. Specifically, it can be, for example, a nitrile rubber sheet with a thickness of 2 mm. Furthermore, it is desirable to provide the rolling stabilization member 5 over the entire upper surface 11 of the lower plate 1 or the lower surface 21 of the upper plate 2, but it is also advisable to provide rolling stabilization members 5, for example, approximately 20 mm wide, in multiple locations distributed over at least a portion of the upper surface 11 of the lower plate 1 or the lower surface 21 of the upper plate 2.

[0055] In Figures 1 and 2, the nitrile rubber sheets (rolling stabilization members) 5 are shown as being distributed in four locations: on the inside of each of the two lower rails 12 protruding from the upper surface 11 of the lower plate 1, and on the inside of each of the two upper rails 22 protruding from the lower surface 21 of the upper plate 2.

[0056] Therefore, the rolling shaft 41 rolls on the rolling stabilization member 5 while receiving a frictional force, as shown in FIG. FIG. 8 is a cross-sectional view of the horizontal single-axis seismic isolation device 10 shown in FIG. 3 taken along line II-II. When the rolling stabilization members 5 are provided in a dispersed manner, their positions and numbers are not limited, and the design can be changed as appropriate.

[0057] In this way, by providing the rolling stabilization member 5 on at least a portion of the upper surface 11 of the lower plate 1 or at least a portion of the lower surface 21 of the upper plate 2, a damping effect can be achieved that uses frictional force to brake the movement of the rolling shaft 41 due to earthquakes or vibrations.

[0058] The horizontal single-axis seismic isolation device 10 configured as described above has limited seismic isolation performance, being movable only in the horizontal single-axis direction. Moreover, due to the small number of parts, it is small and inexpensive. That is, as shown in Figure 9, when an earthquake occurs and the lower plate 1 shakes in a horizontal uniaxial direction, the rolling shaft 41 (displacement means 4) rolls between the lower plate 1 and the upper plate 2, but the rotary damper 42 attached to one end generates a damping force that prevents the rolling shaft 41 from rolling, absorbing the seismic energy and making it difficult for the seismically isolated body S to collapse. In addition, the rolling shaft 41 (displacement means 4) obtains a restoring force that returns it to its original position due to the shape of the upper surface 11 of the lower plate 1, which is formed in a concave arc shape.

[0059] 9, the top plate 2 is shown as being displaced relative to the bottom plate 1 by sliding along the guide groove 23 guided by the stopper pin 31. Also, in Figures 9(B) and (C), when the top plate 2 is displaced relative to the bottom plate 1 (not positioned in the center as shown in Figure 9(A)), the notch 24 that opens the guide groove 23 is positioned away from the stopper pin 31, and the guide groove 23 is caught on the stopper pin 31, preventing the top plate 2 from falling off the side plate 3 (lower plate 1).

[0060] 10, the horizontal uniaxial seismic isolation device may be formed in an arc shape in which the radius of the orbit at one end of the arc on the upper surface 11 of the lower plate 1 and the lower surface 21 of the upper plate 2 is different from the radius of the orbit at the other end of the same arc. In other words, the curvature at one end of the arc may be different from the curvature at the other end, resulting in an asymmetric structure when moving in one direction and when moving in the other direction.

[0061] In Figure 10, for example, if the center of the arc formed on the upper surface 11 of the lower plate 1 is X0, one end side is X1, and the other end side is X2, the curvature of the arc at X0-X2 is shown to be smaller (the radius of the arc orbit is smaller) than the curvature of the arc at X0-X1.

[0062] In this way, by using an asymmetric structure in which the curvature of one arc is different from the curvature of the other arc, it is possible to increase the restoring force on the side of the arcuate path with a smaller radius and also increase the damping force. Therefore, for example, by reducing the radius of the arcuate trajectory when moving toward the wall, it is possible to prevent dead space from being created on the wall side, and to obtain a large range of movement inside the room, allowing for efficient installation next to the wall.

[0063] Furthermore, in this embodiment, the lower plate 1 and the upper plate 2 have been described as having the same size rectangular shape in plan view, but this is not limiting, and the lower plate 1 may have a larger planar area than the upper plate 2. In other words, the installation area of the lower plate 1 may be increased so that the lower plate 1 does not shift position when the upper plate 2 is displaced, thereby increasing the stability of the horizontal uniaxial seismic isolation device. A shape that increases the stability of a horizontal uniaxial seismic isolation device can be, for example, as shown in Figure 11, one that has a lower plate 1 and an upper plate 2 in which the planar area of the lower plate 1 is larger than the planar area of the upper plate 2, and the overall shape is trapezoidal when viewed from the side.

[0064] 11 shows a horizontal single-axis seismic isolation device in which an upper plate 2, which is a horizontally elongated trapezoid in side view and smaller than the lower plate 1, is placed on top of a lower plate 1, which is a horizontally elongated trapezoid in side view, and a rolling shaft 41 (displacement means 4) is placed between the lower plate 1 and the upper plate 2. This horizontal single-axis seismic isolation device also has deviation prevention and tipping prevention means 6, which is composed of a guide groove 31 that follows the direction in which the upper plate 1 is displaced and a stopper pin 26 that is inserted into the guide groove 31.

[0065] One possible way to increase the stability of the lower plate 1 is to attach weights to it to increase its weight, but increasing the installation area of the lower plate 1 and increasing the frictional force against the installation surface will efficiently increase stability without requiring any additional components. [Industrial Applicability]

[0066] The device according to the present invention is expected to be used as a seismic isolation device for objects that are prone to tipping in the X direction but difficult to tip in the Y direction, such as model trains or photo stands, or objects that need to be prevented from falling off a shelf against a wall but are not affected by tipping sideways on the shelf. [Explanation of symbols]

[0067] S Seismic isolation body 1 Lower plate 2 Upper board 3 Side Panel 4. Displacement means 5. Rubber sheet (rolling stabilization material) 10 Horizontal uniaxial seismic isolation device 11 Top side 12 Lower rail 21 Bottom side 22 Upper rail 23 Guide groove 24 Notch 25 Step 31 Stopper pin 32 Standing piece 41 Rolling shaft 42 Rotary damper 43 Color 44 Connecting member 46 Bush (with collar) 47 Small diameter part (guided part)

Claims

1. A lower plate installed at the location of the seismic isolation body; an upper plate disposed above the lower plate and on which the seismic isolation body is placed; a displacement means interposed between the lower plate and the upper plate for displacing the upper plate in one horizontal direction relative to the lower plate; a guide means for assisting the displacement of the upper plate; a deviation prevention and tip-over prevention means for assisting the displacement of the upper plate; A horizontal uniaxial seismic isolation device comprising:

2. 2. The horizontal single-axis seismic isolation device according to claim 1, wherein the displacement means is composed of a plurality of rolling shafts.

3. 3. The horizontal single-axis seismic isolation device according to claim 2, wherein the rolling shaft has a function of stabilizing frictional force so that the rolling shaft can roll without slipping.

4. The horizontal single-axis seismic isolation device according to claim 3, wherein the rolling shaft is provided with a rotary damper.

5. 2. The horizontal single-axis seismic isolation device according to claim 1, wherein the lower plate has an upper surface formed in an arc shape with an upward recess.

6. A horizontal uniaxial seismic isolation device as described in claim 5, characterized in that the upper surface of the lower plate and the lower surface of the upper plate are formed in an arc shape in which the radius of the orbit at one end of the arc is different from the radius of the orbit at the other end of the arc.

7. the guide means is composed of a lower rail provided on an upper surface of the lower plate and an upper rail provided on a lower surface of the upper plate opposite to the lower rail, the displacement means has a guided portion interposed between the lower rail and the upper rail, and the guided portion is guided by the lower rail and the upper rail to displace the upper plate relative to the lower plate; 2. The horizontal uniaxial seismic isolation device according to claim 1.

8. The lower rail is provided such that a portion of an upper surface of the lower plate protrudes toward the upper plate, The upper rail is provided such that a part of the lower surface of the upper plate protrudes toward the lower plate, the guided portion is a small diameter portion sandwiched between the lower rail and the upper rail; The horizontal uniaxial seismic isolation device according to claim 7.

9. the deviation prevention and tipping prevention means is composed of a guide groove along the direction in which the upper plate is displaced and a stopper pin inserted into the guide groove, the displacement means displaces the upper plate relative to the lower plate by being guided by the stopper pin housed in the guide groove; 2. The horizontal uniaxial seismic isolation device according to claim 1.

10. The guide grooves have step portions that protrude downward at one end and the other end of the upper plate that face each other, and are formed to face the inner surfaces of the step portions, respectively; The stopper pins are provided on the side plates so as to protrude outward. The horizontal uniaxial seismic isolation device according to claim 9.

11. The horizontal single-axis seismic isolation device according to claim 10, wherein the guide groove has a notch that allows the stopper pin to be inserted.

12. A lower plate installed at the location of the seismic isolation body; an upper plate disposed above the lower plate and on which the seismic isolation body is placed; a displacement means including a rotary damper that is interposed between the lower plate and the upper plate and that displaces the upper plate in one horizontal direction relative to the lower plate and is constituted by a plurality of rolling shafts; a guide means for assisting the displacement of the upper plate; a deviation prevention and tip-over prevention means for assisting the displacement of the upper plate; Equipped with The lower plate has an upper surface formed in an arc shape concave upward. A horizontal uniaxial seismic isolation device characterized by:

13. A lower plate installed at the location of the seismic isolation body; an upper plate disposed above the lower plate and on which the seismic isolation body is placed; a displacement means including a rotary damper that is interposed between the lower plate and the upper plate and that displaces the upper plate in one horizontal direction relative to the lower plate and is constituted by a plurality of rolling shafts; a guide means for assisting the displacement of the upper plate; a deviation prevention and tip-over prevention means for assisting the displacement of the upper plate; Equipped with The lower plate has an upper surface formed in an arc shape concave upward, the upper plate has a lower surface that is arc-shaped and protrudes downward, and the arc size is equal to the arc size of the upper surface of the lower plate; The upper surface of the lower plate and the lower surface of the upper plate are formed in an arc shape in which the radius of the orbit at one end side of the arc is different from the radius of the orbit at the other end side of the arc. A horizontal uniaxial seismic isolation device characterized by:

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