JP3394766B2 - Seismic isolation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a seismic isolation device using rolling elements for earthquake motion used in buildings, machines, computers, expensive equipment and the like.

[0002]

2. Description of the Related Art As a conventional technique, a rolling element having a rod-like cross section, that is, a roller, which is rollable, is sandwiched between a curved surface on a support and a curved surface below a supported body by the inventor, and There is a seismic isolation device having a central portion and a link mechanism rotatably connected to a support body and a supported body (Japanese Patent Laid-Open No. 10-87).
No. 63 publication, hereinafter abbreviated as roller type). In addition, a seismic isolation system developed by the present inventor in which a guide member having a curved surface is mounted on a support body and a supported body is supported by a rolling body capable of rolling around an axis, that is, an axle and wheels capable of rolling around the axle. There is a device (described in Japanese Patent Publication No. 6-74609).
Hereinafter referred to as wheel type). When these seismic isolation devices are actually used, a plurality of seismic isolation devices are arranged between the support and the supported body side by side according to the weight and shape of the supported body.

[0003]

In the seismic isolation device of the prior art, the restoring force in the displaced state is proportional to the weight of the supported body,
The natural frequency is irrelevant to the weight, and can effectively isolate the long-period ground motion.
Among these, the roller type is, for example, as shown in FIGS.
As shown in (c), a roller 101 is interposed between an upper rail 105 and a lower rail 104 between a support body 2 and a supported body 3 to form one unit, and this unit is vertically orthogonally arranged in two stages to be isolated. A seismic isolation device 100 is provided, and four seismic isolation devices 100 are arranged at front, rear, left and right positions. Next, looking at the seismic isolation device 100 from the front, and at the time of maximum displacement due to the occurrence of a seismic motion in the left-right direction X, the upper unit shown in FIG. The single stroke S indicating the maximum horizontal displacement with the lowest portion, which is the center of the concave surface of the lower rail 104 fixed to the body 2, is substantially equal to the concave longitudinal total length L of the lower rail 104 of one seismic isolation device 100. In order to equally correspond to the total stroke 2S including the moving distances on both the left and right sides stably, the total length of the pair of left and right seismic isolation devices 100 is 2L. For example, in the earthquake motion of the Hanshin Awaji Great Earthquake, the total stroke 2S is about 500 mm, the total length 2L of the pair of left and right seismic isolation devices 100 is 500 mm, and the total length L is about 250 m.
Take m. Therefore, since the length of the lower rail 104 is short, the device can be compactly housed. However, since the damping force does not occur with the roller alone, it is necessary to add the damping force with another device.In addition, the roller may fall off or the concave surface that sandwiches the roller vertically may fall into a deadlock state. Therefore, the above-mentioned JP-A-10-8763
The one disclosed in the publication has a special link mechanism to restrict the movement of the rollers. Further, there are those in which a special damper or a spring damping device or a special frame is added. On the other hand, the wheel type has a simple structure without the need for a special damping device because the friction between the wheel and the axle effectively acts as a damping force, but for all strokes 2S corresponding to the assumed total amplitude of seismic motion. It is necessary to make the rail length L about twice as large as that of the roller type. For example, in the earthquake motion of the Great Hanshin-Awaji Earthquake, the total stroke 2S is about 500 mm, and the total length L of the seismic isolation device is about 500 mm.
Since it becomes 000 mm, there is a problem that the device becomes large. On the other hand, the present invention improves the wheel type, effectively utilizes the damping force by the wheel and the axle and does not require a special damping device, and the size of the device can be made smaller in proximity to the roller type, The object of the present invention is to obtain a simple seismic isolation device that can be downsized and can be applied to a wide range of supported objects from low loads to heavy loads.

[0004]

In order to achieve the above-mentioned object, the present invention is, in the invention of claim 1, mounted between a support and a supported body and fixed to the support. A lower base portion that is provided and extends in the longitudinal direction, a lower rail portion that stands upright on the lower base portion, and an opening portion having a substantially constant width, the central portion of which is the lowest portion and which gradually increases toward both ends, is bored in the lower rail portion. A lower rail having a lower rolling surface formed thereon, an upper base fixed to the supported body and extending in a longitudinal direction, an upper rail standing on the upper base, and a central portion of the upper rail being the highest portion. And an upper rail having an upper rolling surface on which an opening having a substantially constant width is gradually lowered toward both ends, and the lower rail and the upper rolling surface are arranged at symmetrical positions, and the upper rail is disposed. Lower wheels that engage with the lower rolling surface and the lower wheels are supported directly or through bearings. A part axle, an upper wheel that engages with the upper rolling surface, an upper axle that supports the upper wheel directly or via a bearing and that is parallel to the lower axle, and a support that fixes the lower axle and the upper axle to each other. By a seismic isolation device that includes a housing having a material, and that each wheel independently rotates around each axle due to seismic motion and rolls along each rolling surface while allowing the supported body to be isolated. Settled. According to the second aspect of the invention, the seismic isolation device according to the first aspect can be provided in which the lower wheel and the lower axle are paired with each other and the upper wheel and the upper axle are paired with each other. In the invention of claim 3, the seismic isolation device according to claim 1 or 2 using a pair of plate materials as the support material can be provided. According to a fourth aspect of the invention, in the seismic isolation apparatus according to any one of the first to third aspects, each axle is fixed to each wheel and each axle is directly or directly attached to an opening formed in the housing. The seismic isolation device can be rotatably supported via bearings. According to a fifth aspect of the present invention, at least a pair of the seismic isolation devices according to any of the first to fourth aspects is provided so that the wheel rolling directions of the lower rolling surface and the upper rolling surface are perpendicular to each other. The two wheels are stacked and fixed on top of each other, and each wheel rotates around each axle due to seismic motion including two orthogonal components, which makes it possible to isolate the supported body by rolling along each rolling surface. It can be a seismic isolation device.

Among the components used in the seismic isolation device of the present invention, common components will be described. As a support,
As long as the seismic isolation device can be fixed, for example, on the floor
There are foundations or fixed materials / fixed materials or structures on them. As the material of the rail, metal, hard wood, hard plastic, FRP, glass, ceramic, etc. can be used, but the most commonly used is carbon steel or stainless steel, the material and size depending on the weight of the supported object and the usage conditions. Is selected. The concave shape of the rail is not particularly limited, but in order to obtain a desired spring constant, the rail has a minimum or maximum vertical cut surface and is usually symmetrical, for example, an arc, a parabola, a hyperbola, a straight line, etc. alone or in combination. A fixed or variable type is used, and is selected so that the supported body is in the reference state of the lowest level position when the earthquake is not activated. As the characteristic of the restoring force, for example, one described in Japanese Patent Publication No. 6-74609 is used. It is also possible to provide a saucer portion on which the wheel is placed on the concave end of the lower rail so that the wheel moves to the central portion when an earthquake motion occurs. Further, it is preferable to dispose stoppers made of, for example, rubber, a spring material, a steep slope of the rail, or bending of the rail at both ends of the rail.
The configuration of the wheel and the axle is not particularly limited as long as it is a rolling element that can roll around the axis. Metals, ceramics, hard plastics, etc. can be used as materials for wheels, axles, and connecting materials, but the most commonly used are carbon steel or stainless steel, and hard plastics are used for light loads, and the weight of the supported body is large. The material and size are selected according to the usage conditions.
The wheels are preferably equipped with rolling bearings or oil-free bearings, and ready-made wheels can also be used.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first seismic isolation device related to the present invention.
It is a part of example, (a) CC direction front view, (b) front view, (c) A-A sectional side view, (d) BB sectional side view. FIG. 2 is a schematic front view showing the operation of the seismic isolation apparatus of FIG. 1, which is (a) in a reference state, (b) in an intermediate displacement, and (c) in a maximum displacement. 3A is a schematic plan view of a conventional roller type seismic isolation device in a reference state, FIG. 3B is a schematic front view of FIG. 3A, and FIG. 3C is a schematic front view of maximum displacement. Figure 4
It is the schematic plan view in the (a) standard state which combined the seismic isolation device 1st example of FIG. 1, (b) The schematic front view of (a), (c) The schematic front view at the time of maximum displacement. FIG. 5 (a) is a schematic front view showing the behavior of the wheel portion of the seismic isolation device of FIG. 1 during intermediate displacement,
(B) It is a schematic front view at the time of a reference state of (a), (c) It is a schematic front view at the time of intermediate displacement which shows the behavior of the roller part of the conventional roller type seismic isolation apparatus. FIG. 6 is a schematic front view showing a second example of the seismic isolation device related to the present invention, in which (a) the reference state,
(B) At maximum displacement. FIG. 7 shows the seismic isolation device of the present invention.
In one example , (a) is a plan view and (b) is a front view. Figure 8
[Fig. 8] is a partially enlarged view of the seismic isolation device of Fig. 7, (a) DD sectional front view, and (b) EE sectional side view. FIG. 9 shows the present invention.
In the third example of the seismic isolation device related to , (a) plan view, (b)
It is a front view. FIG. 10 is an enlarged view of a wheel portion of the seismic isolation device of FIG. 9, (a) front view, (b) FF cross-sectional front view, (c).
It is a top view and (d) GG sectional top view. FIG. 11: is a 4th example of the seismic isolation apparatus relevant to this invention , and a lower half is shown by a front view and an upper half is shown by the center longitudinal cross-sectional view. Figure 12
It is a schematic front view which shows the 5th example of the seismic isolation apparatus relevant to this invention, (a) At the time of a reference state, (b) At the time of maximum displacement, (c) At the time of a reference state of a modification. FIG. 13 is a schematic front view showing a sixth example of the seismic isolation device related to the present invention , in which (a) is in a reference state and (b) is at maximum displacement. Hereinafter, the seismic isolation device will be described as left / right, up / down, and front / back when viewed from the front.

Referring to FIG. 1, the structure of a seismic isolation device 1 of a first example related to the present invention will be described. Part of the reference numerals of the same structure is omitted. The seismic isolation device 1 is installed by being interposed between the support body 2 and the supported body 3, and includes a lower rail 4, an upper rail 5, wheels 7, an axle 8 and a housing 6. The lower rail 4 is fixedly mounted on the support 2, and is formed in, for example, a circular arc surface as a concave shape in which the central portion is the lowest portion and gradually increases toward both ends, and the upper rail 5 is formed on the lower surface of the supported body 3. The upper rail 5 is fixed on the lower rail 4 and the upper rail 5 is arranged so that the upper rail 5 faces the lower rail 4 as a concave shape in which the central portion is the highest portion and gradually lowers toward both ends. It is set up. Four wheels 7 are arranged at vertically and horizontally symmetrical positions when the lower rail 4 and the upper rail 5 are viewed in the longitudinal direction, that is, the wheel rolling direction left and right, and a pair of left and right lower wheels 7a, 7a engaging with the lower rail 4 are provided. , A pair of left and right upper wheels 7b, 7b that engage with the upper rail 5. Four axles 8 are arranged at vertically and horizontally symmetrical positions, and a pair of left and right lower axles 8a and 8a that pivotally support lower wheels 7a and 7a and an upper wheel 7b and 7b are pivotally supported. And a pair of left and right upper axles 8b, 8b, which are parallel to each other. Here, the lower axles 8a, 8
The a and the upper axles 8b and 8b are fixed to supporting members 6a and 6a of the housing 6 which will be described later by fasteners such as snap rings 8c, 8c and 8d and 8d. Instead of the snap rings 8c, 8c and 8d, 8d, screws may be engraved at the front and rear ends of the lower axles 8a, 8a and the upper axles 8b, 8b and fixed by tightening nuts. Further, it is preferable to interpose a separate bearing 9 such as an oil-free bearing or a rolling bearing between each wheel and the axle because stable friction can be obtained. However, if a light load or a hard plastic is used for the wheel and the axle, it is intervened. Is unnecessary. The lower wheels 7a, 7a and the upper wheels 7b, 7b are preferably formed with flanges 7c and 7d on both edges, respectively, and are engaged with the lower rail 4 and the upper rail 5, respectively, to prevent wheel removal.

The housing 6 has lower axles 8a, 8a and upper axles 8b, 8b formed in holes formed at vertically and horizontally symmetrical positions.
The snap rings 8c, 8 of the fastener with the front and rear ends of the
a pair of front and rear supporting members 6a, 6a, which are fixed in parallel with each other and fixed by c and 8d, 8d,
a and 6a, and a rod-shaped connecting member 6b having a circular cross section, which is fixed across the central portions. The shape of the support members 6a, 6a is not limited to a substantially rectangular shape, but may be any shape as long as the axles can be fixed at vertically and horizontally symmetrical positions, and the center of the hole formed in the support member 6a, the wheels 7, and the axles 8 can be fixed. The shaft center is arranged at the top of the square. Although this connecting member 6b is effective for keeping the supporting members 6a, 6a parallel to each other and maintaining strength, the lower axles 8a, 8a
a and the upper axles 8b, 8b may be replaced with each other,
Further, the cross-sectional shape does not have to be circular, as long as the position is not between the central portions of the support members 6a, 6a and avoiding each wheel. With the above configuration, among the wheels 7, the lower wheels 7a, 7a rotate along the lower rails 4 while rotating around the lower axles 8a, 8a fixed to the supporting members 6a, 6a, and the upper wheels 7b, 7b support the supporting members 6a, 6a. It is possible to independently roll along the upper rail 5 while rotating around the upper axles 8b, 8b fixed to 6a. The above-described seismic isolation device 1 is used alone. For example, as shown in FIGS. 4 (a) and 4 (b), a pair of the seismic isolation devices 1 are installed so that the wheel rolling directions of the lower rail 4 and the upper rail 5 are different from each other. The support 2 is placed on the support 2 in two steps in the left-right direction X and the front-back direction Y so as to be at right angles and fixed to each other.
4 units are provided at the four corners of the supported body 3 which are fixedly mounted on the above to form one unit. In the case of a light load, only two units stacked in two stages have left-right direction X and front-back direction Y.
Can be used for seismic isolation including two orthogonal components of, and it is also possible to use only one step for unidirectional seismic isolation in the left-right direction X or the front-rear direction Y.

[0009] For FIG. 6, the configuration of the seismic isolation device 10 of the second example related to the present invention. The same components as those of the seismic isolation device 1 will be designated by the same reference numerals, and some of the drawings and the description will be omitted, and the differences will be described. Seismic isolation device 1
The reference numeral 0 is mounted so as to be interposed between the support body 2 and the supported body 3, and includes a lower rail 4, an upper rail 5, wheels 17, an axle 18, and a housing 16. One wheel 17 is upper 1 and lower 2
A total of three pieces are provided and have a pair of left and right lower wheels 17a, 17a that engage with the lower rail 4 and one upper wheel 17b that engages with the upper rail 5. A total of three axles 18 are arranged, one on the lower side and two on the lower side. The lower wheels 17a, 17a
A pair of left and right lower axles 18a, 18 that rotatably pivot
a and one upper axle 18b that rotatably supports the upper wheel 17b, and the respective axles are parallel to each other. The separate bearings, fasteners, and connecting members can be selected in the same configuration as the seismic isolation device 1. Housing 1
Reference numeral 6 has the same structure as the housing 6 except for a pair of front and rear support members 16a which are arranged in parallel and each of which has a pair of front and rear holes in which a total of three holes are formed. Here, the center of the hole formed in the support member 16a, each wheel 17, and the axle 18
The axial center of is arranged at the apex of the triangle. With the above configuration, among the wheels 17, the lower wheels 17a, 17a are rotated around the lower axles 18a, 18a along the lower rail 4, and the upper wheels 17b are rotated around the upper axle 18b along the upper rail 5. It is possible to roll each independently. Here, a pair of lower wheels 17a, 17a is used,
Since one upper wheel 17b is used, the seismic isolation device 1
In comparison with the above, the upper rail can be shortened by the distance between the wheels, and the height of the triangle formed by the holes formed in the support member 16a can be made small, resulting in a narrow distance between the lower rail 4 and the upper rail 5. There is an advantage of downsizing the device, such as reducing the number of wheels by one. However, it is necessary to select a large upper wheel 17b in order to provide the load bearing capacity of the supported body 3 by one.
The number of wheels is increased, and the stability is slightly reduced as compared with the case where two wheels are used. Also, the wheel arrangement shown in FIG. 6 may be turned upside down, which is suitable when the lower rail needs to be shorter than the upper rail.

The construction of the seismic isolation device 20 of one example of the present invention will be described with reference to FIGS. FIG. 8 shows a seismic isolation device 20
FIG. 7 shows a part of the units, and in FIG. 7, a total of 4 units are arranged under the supported body 3. First, one basic unit will be described. Only some of the common components have reference numerals. The seismic isolation device 20 includes a lower rail 24,
Upper rail 25, wheels 27, axle 28 and housing 2
6 and. The lower rail 24 includes a lower base portion 24a that is fixedly provided on the support body 2 and that extends in a longitudinal direction, a lower rail portion 24b that extends vertically upward in the central portion of the lower base portion 24a, and extends in a longitudinal direction, and a lower rail portion. 24b has a lower rolling surface 24c in which, for example, an arc-shaped opening is formed as a concave shape having a substantially constant width in the central portion and gradually increasing toward both ends. The upper rail 25 is an upper base portion 25 fixed to the supported body 3 and extending in a narrow and long direction.
a, an upper rail portion 25b vertically extending downward in the central portion of the upper base portion 25a and extending in the longitudinal direction, and a substantially constant width in which the central portion is the highest portion of the upper rail portion 25b and gradually decreases toward both ends. It has an upper rolling surface 25c in which an arcuate opening is formed as a concave shape. The lower rail 24 and the upper rail 25 are arranged such that the lower rolling surface 24c and the upper rolling surface 25c face each other in a symmetrical position with a slight gap therebetween. Four wheels 27 are arranged vertically and horizontally symmetrically when the lower rail 24 and the upper rail 25 are viewed in the longitudinal direction, that is, the wheel rolling direction left and right.
A pair of left and right lower wheels 27 that engage with the rolling surface 24c of the No. 4
a and 27a and a pair of left and right upper wheels 27b and 27b that engage with the rolling surface 25c of the upper rail 25.
Four axles 28 are arranged at symmetrical positions in the vertical and horizontal directions, and a pair of left and right lower axles 28a, 28a that pivotally support lower wheels 27a, 27a and an upper wheel 27b, 27b are pivotally supported. And a pair of left and right upper axles 28b, 28b which are parallel to each other. Here, although omitted in the drawing to avoid congestion, like the seismic isolation device 1, the lower axles 28a, 28a and the upper axles 28b, 28 are used.
Reference numeral b is a fixing member such as a snap ring or a nut, which is used as a support member 26a for the housing 26, which will be described later.
Is stuck to. As a preferable configuration, a separate bearing 29 may be interposed between each wheel and the axle, and the lower wheel 27a and the upper wheel 27b have flanges 27 on both edge sides.
Similar to the seismic isolation device 1, the c and 27d may be formed, respectively.

In the housing 26, the front and rear end portions of the lower axles 28a, 28a and the upper axles 28b, 28b are fitted in four holes vertically and horizontally symmetrically formed, and the front and rear are secured by fasteners (not shown). It has a pair of substantially rectangular plate-like support members 26a, 26a placed in parallel. Here, the structure corresponding to the connecting member 6b of the seismic isolation apparatus 1 is omitted, and the lower axles 28a, 28a and the upper axles 28b, 2 are omitted.
Although each 8b also serves as a connecting member, the connecting member may be passed between the supporting members 26a, 26a as a separate member at a position avoiding each wheel. With the above configuration, among the wheels 27, the lower wheels 27a, 27a are rotated around the lower axles 28a, 28a fixed to the support members 26a, 26a, and along the lower rolling surface 24c of the lower rail 24, the upper wheels 27b,
27b is the upper axle 2 fixed to the support members 26a, 26a.
While being rotated around 8b and 28b, along the upper rolling surface 25c of the upper rail 25, the rolling surfaces 24c and 25c can be independently rolled in the substantially constant width openings in a vertically restrained state. There is. When one unit of the seismic isolation device 20 is used, the seismic isolation device 20 can be applied to the seismic isolation in either the left-right direction X or the front-rear direction Y, but FIG. The units are arranged side by side to form a single stage, and the lower rail 24 and the upper rail 25 are stacked in two stages on the support body 2 in the left-right direction X and the front-rear direction Y so that the wheel rolling directions are at right angles to each other with the intermediate member 22 interposed therebetween. Then, they are fixed to each other, and a total of 4 units are arranged at the outer edge portion under the supported body 3.

Referring to FIGS. 9 and 10, the first related to the present invention is shown.
The configuration of the seismic isolation device 30 of three examples will be described. FIG. 10 shows an enlarged rolling portion of the seismic isolation device 30, such as a wheel, and FIG. 9 shows an example in which the seismic isolation device 30 is used in two orthogonal directions. First, the basic unidirectional rolling portion will be described, but common structural elements are given reference numerals only for some of them. Seismic isolation device 30
In addition to the essential components of the lower rail 34, the upper rail 35, the wheels 37, the axle 38 and the housing 36, the reinforcing member 31 is provided as an optional component. The lower rail 34 and the upper rail 35 have the same concave shape as the lower rail 4 and the upper rail 5 of the first example, but the width in the direction perpendicular to the concave wheel rolling direction is the lower rail 4 and the upper rail. Greater than 5. The wheels 37 are disposed at vertically and horizontally symmetrical positions with respect to the lower rail 34 and the upper rail 35, and a pair of left and right lower wheels 37a, 37a are engaged with each other in a width direction perpendicular to the wheel rolling direction of the lower rail 34.
Are arranged in series at intervals T (n is an integer of 2 or more, as shown in FIG.
6 rows) and a total of 2 × n pieces and a pair of left and right upper wheels 37b, 37b that engage in the width direction of the upper rail 35 are arranged in series at intervals T with a total of 2 × n rows of n rows. Has been done. Four axles 38 are arranged at symmetrical positions in the vertical and horizontal directions, and a pair of left and right lower axles 38a, 38a pivotally supporting lower wheels 37a of each n row and upper wheels 3 of each n row.
A pair of left and right upper axles 38b pivotally supporting 7b,
38b and each axle is parallel.
The separate bearing 39 has a selective structure like the bearing 9 of the first example.

The housing 36 has lower axles 38a, 38a and an upper axle 38 formed in holes formed at vertically and horizontally symmetrical positions.
b and 38b, the front and rear ends of which are fitted and fixed as fasteners by, for example, snap rings 38c, 38c and 38d, 38d. 36a, 36a, and a long connecting member 36b having a circular cross section which is fixed by a fixing member 36c such as a nut across the central portions of the 36a.
In the case of a light load, the connecting member 36b may be omitted. The fixing device 36c can be modified and used as in the first example. The reinforcing member 31 includes the lower axles 38a, 38a and the upper axle 38 between the lower wheels 37a, 37a and the upper wheels 37b, 37b adjacent to each other between the pair of front and rear housings 36.
n-1 (five in FIG. 10) substantially rectangular plate-like bodies having a width t slightly smaller than the interval T and fitted through b and 38b, but can be omitted in the case of a light load. is there. With the above configuration, in the rolling portion in one direction of the seismic isolation device 30 of FIG. 10, the n wheels of the lower wheels 37a rotate around the lower axles 38a, 38a fixed to the support members 36a, 36a, and the lower rails. 34, upper wheels 37b, 37b of n rows each
Is an upper axle 38b fixed to the support members 36a, 36a,
While rotating around 38b, they roll independently along the upper rail 35 and can be isolated from the earthquake motion in one direction. On the other hand, FIG. 9 shows a pair of the unidirectional rolling portions, which are two stages above and below the support 2 in the left-right direction X and the front-rear direction Y so that the wheel rolling directions of the lower rail 34 and the upper rail 35 are perpendicular to each other. The seat plates 33, which are overlapped with each other and are arranged in a cross shape under the supported body 3 and which straddle the upper rail 35 of the lower stage and the lower rail 34 of the upper stage, are fixed to the end portions by fasteners such as a crossing bolt. Thus, it is possible to isolate the seismic motion including the two-direction components of the left-right direction X and the front-rear direction Y which are orthogonal to each other.

With reference to FIG. 11, the structure of a seismic isolation device 40 according to a fourth example of the present invention will be described. The seismic isolation device 40 includes a lower rail 44, an upper rail 45, wheels 47, an axle 48,
In addition to the essential components of the housing 46 and the cam portion 50, the reinforcing member 41 is provided as an optional component. Here, the wheel 47, the axle 48, and the reinforcing member 41 have the same configurations as the wheel 37, the axle 38, and the reinforcing member 31 described in the third example, and detailed description thereof will be omitted. The lower rail 44 and the upper rail 45 have a lower rail surface 44a and an upper rail surface 45a, which have the same concave shape as the lower rail 34 and the upper rail 35 of the third example, on the surface, and are perpendicular to the concave wheel rolling direction. The width of the direction is large. In addition, lower guide surfaces 44b having an L-shaped cross section parallel to the lower rail surface 44a and having a constant width are engraved at both lower end edges of the lower rail surface 44a, and upper rail surfaces 45a are formed at both upper end edges of the upper rail surface 45a.
And an upper guide surface 45b having an L-shaped cross section that is parallel to and constant in width is engraved. The housing 46 includes a pair of front and rear support members 46a and 46a having a narrow upper and lower width and support members 46a and 46a.
a The front and rear end portions of the lower axle shafts 48a, 48a and the upper axle shafts 48b, 48b are fitted into four holes formed at the central portion in the vertically and horizontally symmetrical positions, and are fixed by a fixing tool, and further, of the support members 46a, 46a. Holes are formed in the upper and lower end portions of the support member 4
A long connecting member 46 having a circular cross section which is fixed by a fixing member 46c such as a nut across the central portions of 6a and 46a.
However, in the case of a light load, the connecting member 46b may be omitted, and the fixing tool 46c can be modified and used as in the first example. The cam portion 50 penetrates through the holes formed in the upper and lower ends of the support members 46a, 46a, and the inside end portion of the shaft 50a that is fixed to the outside by a fixing member 50b such as a nut. Four roller-like cam followers 50c are rotatably disposed via a separate bearing 50d, and the cam followers 50c are rollable along the lower guide surface 44b and the upper guide surface 45b. Here, the bearing 50d has an optional configuration.

FIG. 12 (a) relates to the present invention .
The configuration of the seismic isolation device 60 of the fifth example will be described. Seismic isolation device 60
Is mounted so as to be interposed between the support body 2 and the supported body 3, and includes a lower rail 64, an upper rail 65, wheels 67, an axle 68, and a housing 66. The lower rail 64 is fixed on the support body 2 with a total length L in the left-right direction, and has a concave shape in which the lowest portion gradually becomes higher toward both ends at a middle position u which is ½d leftward from the central portion. Is formed in. The upper rail 65 is fixed below the supported body 3 with a total length L in the left and right direction, and in the standard state when the earthquake is not operating, the highest part gradually moves toward both ends at the middle position v which is 1 / 2d to the right of the central part. The lower concave shape is formed, for example, in an arc surface, and the upper rail 65 is disposed above the lower rail 64 with the arc surfaces facing each other. Therefore, the horizontal shift between the middle positions u and v is set to d. Four wheels 67 are provided on each of the upper and lower sides, and a total of four wheels 67 are provided on the lower rail 64.
A pair of left and right lower wheels 67a, 67a engaged with and a pair of left and right upper wheels 67b, 67 engaged with the upper rail 65.
b. A total of four upper and lower two axles 68 are provided, and a pair of left and right lower axles 68a and 68a that pivotally support lower wheels 67a and 67a and an upper wheel 67 are provided.
a pair of left and right upper axles 6 that rotatably support b and 67b.
8b and 68b, and the respective axles are parallel to each other, and the axial center distance in the left-right horizontal direction is set to d between the lower axle 68a and the upper axle 68b located at the adjacent positions on the left and right end portions, and the lower axle 68a is provided. , 68a and upper axles 68b, 6
Between 8b, each is taken by e and has a relationship of e = 2d.
The above-mentioned relational dimensions of the respective parts are not strict and are substantial relations, and some differences are allowed. Housing 66
Has a structure similar to that of the housing 6 except a pair of front and rear substantially rectangular plate-shaped supporting members 66a having two upper holes and two lower holes. The center of the hole formed in the support member 66a is arranged in parallel with the line connecting the upper two and the line connecting the lower two, and is formed into a parallelogram shown by a dashed line including these lines. The distance h between the line connecting the two pieces and the line connecting the lower two pieces can be made small, and as a result, the distance between the lower rail 64 and the upper rail 65 is narrow, and the seismic isolation device 60 is provided.
Lowers the height. Lower axles 68a, 68a and upper axles 68b, 68b are provided in the four holes formed in the support material 66a.
The front and rear ends of the wheel are fitted and fixed, respectively, and the axes of the wheels 67 and the axles 68 are arranged at the vertices of the parallelogram.
Bearings between the wheels 67 and the axles 68, fasteners between the axles 68 and the housing 66, connecting members between the pair of front and rear support members 66a, and the like can be selected similarly to the seismic isolation device 1. With the above structure, the wheels 67 are also referred to with reference to FIG.
The lower wheels 67a, 67a of the support members 66a, 66a
Along the lower rail 64 while rotating around the lower axles 68a, 68a fixed to the upper wheels 67b, 67b, the upper wheels 68b, 68b fixed to the support members 66a, 66a.
It is possible to roll independently along the upper rail 65 while rotating around.

Next, with reference to FIG. 12 (c), the structure of a seismic isolation device 61 as a modification of the fifth example seismic isolation device 60 will be described. The same components as those of the seismic isolation device 60 are designated by the same reference numerals and detailed description thereof will be omitted. The seismic isolation device 61 is mounted so as to be interposed between the support body 2 and the supported body 3, and includes a lower rail 62, an upper rail 63, wheels 67, an axle 68, and a housing 69. The lower rail 62 has a left and right overall length L ₀ , and is formed in, for example, a circular arc surface as a concave shape in which the lowest portion gradually increases toward both ends at a middle position w that is ½f to the left of the central portion, and the upper rail 63 Is a concave shape in which the maximum length gradually decreases toward both ends at the middle position z, which is ½f to the right side from the central part, in the reference state when the earthquake is not operating, with a left and right total length L ₀ , and is formed in an arc surface, for example. Is
The upper rail 63 is disposed above the lower rail 62 with their arcuate surfaces facing each other. Therefore, the horizontal shift between the middle positions w and z is set to f. Here, compared to the normal seismic isolation device 60, the relationship of L ₀ > L, f ≧ d is satisfied. The wheels 67 and the axles 68 are arranged such that the respective axles are parallel to each other and the axial center distances in the left and right horizontal directions are adjacent to each other on the left and right end sides, and the lower axle 68a and the upper axle 68b are respectively set to f, and the lower axle 68a, The distances between 68a and the upper axles 68b and 68b are respectively set to g, and are the same as those explained for the seismic isolation device 60 except that they are in the relationship of f ≧ d and g> e compared with the normal seismic isolation device 60. is there. The above-mentioned relational dimensions of the respective parts are not strict and are substantial relations, and some differences are allowed. The housing 69 is composed of a pair of front and rear substantially rectangular plate-shaped supporting members 69a having two upper and two lower holes formed therein, and the center of the holes formed in the supporting member 69a is upward. A line connecting two pieces and a line connecting the bottom two pieces are arranged in parallel to each other and are formed into a parallelogram indicated by an alternate long and short dash line. Usually, a line connecting the top two pieces and a line connecting the bottom two pieces are formed. The interval i can be set to be as small as the interval h, and as a result, the interval between the lower rail 62 and the upper rail 63 is narrow and the height of the seismic isolation device 61 is low. The front and rear ends of the lower axles 68a and 68a and the upper axles 68b and 68b are fitted and fixed in the four holes formed in the support member 69a, and the axes of the wheels 67 and axles 68 are parallelogram vertices. Is disposed in the section. Here, seismic isolation device 61 is replaced by seismic isolation device 6
Compared with 0, since the interval i can be similarly small, the interval between the lower rail 62 and the upper rail 63 is narrow and the seismic isolation device 6
Although the height of 1 is low, the total length of each rail and the lateral width of the support material 69a are large. Although not shown due to the above-mentioned configuration,
Of the wheels 67, the lower wheels 67a and 67a are supporting members 69.
The upper wheels 67b, 6 are rotated along the lower rail 62 while rotating around the lower axles 68a, 68a fixed to the a, 69a.
7b is an upper axle 68 fixed to the supporting members 69a and 69a.
It is possible to independently roll along the upper rail 63 while rotating around b and 68b.

FIG. 13 (a) relates to the present invention .
The configuration of the seismic isolation device 70 of the sixth example will be described. Seismic isolation device 70
Is mounted so as to be interposed between the support body 2 and the supported body 3, and includes a lower rail 74, an upper rail 75, wheels 77, an axle 78 and a housing 76. Wheels 77 are upper and lower 2
A total of four pieces are arranged, and have a pair of left and right lower wheels 77a and 77a that engage with the lower rail 74 and a pair of left and right upper wheels 77b and 77b that engage with the upper rail 75. The lower rail 74 is fixedly installed on the support body 2 with a total length L in the left and right direction, and is formed in a concave shape in which the central portion is the lowest portion and gradually increases toward both ends, for example, an arc surface, and the upper rail 75 is the above-mentioned. The lower rail 74 has a right and left overall length L'shorter than the total length L, which is fixedly mounted below the supported body 3, and is formed in a circular shape, for example, as a concave shape in which the central portion is the highest portion and gradually decreases toward both ends. The upper rail 75 is disposed above the lower rail 74 with their arcuate surfaces facing each other. There are a total of four axles 78, two on the top and one on the bottom.
a, 77a a pair of left and right lower axles 7 that pivotally support
8a, 78a and a pair of left and right upper axles 78b, 78b pivotally supporting the upper wheels 77b, 77b,
Each axle is parallel. Housing 76
Has the same structure as that of the housing 6 except for a pair of front and rear substantially trapezoidal plate-shaped support members 76a having two upper holes and two lower holes. The center of the hole formed in the support member 76a is parallel to the line connecting the upper two and the line connecting the lower two, and is formed in a trapezoidal shape indicated by a chain line including these lines. Usually, the upper two are connected. The distance j between the line and the line connecting the lower two can be made small, and as a result, the distance between the lower rail 74 and the upper rail 75 is narrow and the height of the seismic isolation device 70 is low. The lower axle 7 is inserted into the four holes formed in the supporting member 76a.
The front and rear ends of the wheels 8a and 78a and the upper axles 78b and 78b are fitted and fixed, respectively, and the axes of the wheels 77 and the axles 78 are arranged at the apex of the trapezoid. Here, the shape of the support member 76a is not necessarily limited to the trapezoidal shape, and may be any shape as long as each of the four axles 78 can be fixed. Bearings between the wheels 77 and the axles 78, fixtures between the axles 78 and the housing 76, connecting members between the pair of front and rear support members 76a, and the like can be selected as in the seismic isolation device 1. With the above configuration, FIG.
Referring also to (b), the lower wheels 77a, 7 of the wheels 77
7a is a lower axle 78 fixed to the support members 76a, 76a.
a and 78a along the lower rail 74 while rotating, and the upper wheels 77b and 77b independently rotate along the upper rail 75 while rotating around the upper axles 78b and 78b fixed to the support members 76a and 76a. It is possible to roll. Here, the total length L'is lower than L by the lower axles 78a, 78a.
It is possible to reduce the distance by the difference in center distance between a and between the upper axles 78b, 78b, but the lengths may be the same. See also FIG.
The wheel arrangement shown in (1) may be turned upside down and the trapezoid formed by the axis of the axle 78 may be turned upside down. In this case, the lower rail 74 can be shorter than the upper rail 75.

The above-described seismic isolation device of the present invention and related thereto
In each of the first to sixth examples of the seismic isolation device , each axle is fixed to each wheel, and each axle is rotatably fitted and supported by providing an opening in the housing, or a separate body fixed to the housing. You may make it support via a bearing.
Further, the lower rail and the upper rail are arranged with their arcuate surfaces facing each other, but the upper rail is not necessarily directly above the lower rail, but the shift is allowed if the balance is maintained in the facing direction. In addition, the seismic isolation device No. 2 related to the present invention ,
Except 5 and 6 of example, and the axis of each wheel and the axle showed what vertically symmetrical positions In the vertex portion of the rectangle, not necessarily at the top and bottom symmetrical position, the second, 5及It may be arranged so as to be at the apex of the triangle, parallelogram, or trapezoid shown in Example 6 and 6 . In this case, although the vertical interval between the lower rail and the upper rail is narrow and the height of the seismic isolation device is low, there is a feature that the rail length and shape are different. Also, books
Seismic Isolation Device of Invention and Seismic Isolation Device Related to the First to Sixth Embodiments
In each case, the axial center positions of the wheels and the axles may not be strictly arranged at the apexes of any of triangles, squares, parallelograms, or trapezoids, as long as they are substantially any of these shapes. Good. Furthermore, as long as the posture of the supported body does not collapse, it is also possible to select one of the above-mentioned triangle, square, parallelogram or trapezoidal shape.

Next, referring to FIG. 2, the operation of the seismic isolation device 1 of the first example related to the present invention will be described. When the earthquake is not in operation, the lower wheels 7a, 7 of the seismic isolation device 1 are as shown in FIG.
a is at the center of the lower rail 4 and is equidistant from the lowest concave position, and the upper wheels 7b and 7b are at the center of the upper rail 5 and is equidistant from the concave highest position. The support body 3 is stationary above the support body 2 in a stable state at the lowest level reference state position. When an earthquake motion in the left-right direction X occurs, the lower wheels 7a, 7a roll on the concave surface of the lower rail 4 at the time of intermediate displacement as shown in FIG. 2B, and at the same time, the upper wheels 7b, 7b move on the upper rail 5. Rolling on the concave surface, and at the time of maximum displacement, relative displacement is generated as shown in FIG. 2C, and as a result, the supported body 3 receives a restoring force corresponding to the displacement from the lowest level position and vibrates. Again, since the load of the supported body 3 does not reach the supporting body 2 directly and passes through between each wheel and the axle, friction effectively acts as a damping force and seismic isolation works. here,
One stroke P of the maximum horizontal movement distance from the lowest portion which is the center of the concave surface is defined by the concave longitudinal length L of the lower rail 4 and the inter-axial distance Q of the lower axle 8a and the upper axle 8b. The relation between them is approximately P = LQ. Although the seismic isolation device 1 can be used alone to obtain a seismic isolation action in one direction of the left-right direction X, as shown in FIG.
The support 2 so that the wheel rolling directions are perpendicular to each other.
It is possible to obtain seismic isolation in two right-and-left directions X or front-and-rear direction Y at a right angle in a single unit by stacking two units on top of each other. In the case of occurrence, the supported body 3 swings to the combined position corresponding to the seismic motion in each direction, and seismic isolation works. Further, as described with reference to FIG. 3 for the conventional roller type seismic isolation device, in order to stably correspond to the total stroke 2P as the assumed total amplitude of the seismic motion, a pair of seismic isolation devices 1 should be provided on the left and right sides. Since the total length is 2L = 2P + 2Q, and Q is a value that is sufficiently small with respect to L, it is much smaller than the total length of the wheel type described above and is very close to the roller type, and no special damping device is required and the structure is simple. In addition, the device can be downsized. For example, in the earthquake motion of the Hanshin Awaji Great Earthquake, the total stroke 2P is about 500mm,
The total length 2L of the pair of left and right seismic isolation devices 1 is about 500mm +
2Q, one total length L should be about 250 mm + Q.
Further, as shown in FIG. 4, by arranging four units at the four corners of the supported body 3, it is possible to obtain a seismic isolation action for the heavier supported body 3 including two orthogonal components. By arranging the units in an increased / decreased manner according to the weight and shape of the supported body 3, it can be widely applied as a seismic isolation device from a low load to a heavy load.

The force balance of the operation of the seismic isolation device 1 described with reference to FIG. 2 will be described with reference to FIG. 5 in comparison with a conventional roller type seismic isolation device. First, in the conventional roller-type seismic isolation device 100 in the standard state, when an earthquake motion in the left-right direction X occurs, the roller 101 and the rails 104, 1
The roller 101, which was in the standard state, slipped between 05 and is sandwiched by the portion narrowed toward the left side between the lower rail 104 and the upper rail 105, and reached during the intermediate displacement shown in FIG. 5 (c). Torque acts in the counterclockwise direction a on the portion of the roller 101 that contacts the upper rail 105, while in the clockwise direction b on the portion of the roller 101 that contacts the lower rail 104.
Since a torque is applied to the direction a, it is difficult for the restoring forces in the directions a and b to cancel each other in the direction opposite to the operation direction X of the seismic motion, and it is difficult to expect a smooth seismic isolation. On the other hand, FIG.
In the seismic isolation device 1 shown in (b), when a seismic motion in the left-right direction X occurs, the lower wheels 7a, 7a and the upper wheels 7b, 7b in the reference state shown in FIG. And along the upper rail 5 at the time of the intermediate displacement shown in FIG. 5 (a), at this time, torque acts in the clockwise direction b on the portion contacting the left lower wheel 7a and the lower rail 4, and the left upper wheel 7b and the upper rail 7b. Torque acts on the portion contacting the rail 5 in the counterclockwise direction a, but the left lower wheel 7
Since the a and the left upper wheel 7b are rotatable independently of each other around the axles 8a and 8b supported by the support member 6a, the restoring force F in the direction opposite to the operation direction X of the seismic motion acts, and It acts so as to return to the reference state shown in 5 (b). At this time, the right lower wheel 7a and the right upper wheel 7b are slightly separated from the lower rail 4 and the upper rail 5, respectively, and can rotate independently, so they do not hinder the restoration.

With reference to FIG. 6, the operation of the seismic isolation device 10 of the second example related to the present invention will be described. Figure 6 when the earthquake is not in operation
As shown in (a), lower wheels 17a, 1 of the seismic isolation device 10
7a are equidistant from the lowest concave portion in the center of the lower rail 4, and the upper wheels 17b are highest concave portion in the center of the upper rail 5, so that the supported body 3 is at the lowest level. It is stationary above the support 2 in a stable state at the reference state position. When a seismic motion in the left-right direction X occurs, the lower wheels 17a, 17a roll on the concave surface of the lower rail 4, and at the same time, the upper wheel 17b rolls on the concave surface of the upper rail 5, as shown in FIG. 6 (b). As a result, the supported body 3 repeats the vibration due to the restoring force corresponding to the displacement from the lowest level position, as a result of the relative displacement between the wheels and the axle. Friction acts effectively as a damping force, and seismic isolation works. The seismic isolation device 10 is the same as the first example, and is much smaller than the wheel type, and can handle all strokes of the assumed earthquake motion with a size very close to the roller type, and a special damping device is not required and the structure is simple. In addition, the device can be downsized.

Referring to FIGS. 7 and 8, the seismic isolation device 20 of the present invention .
The operation of will be described. Although the seismic isolation device 20 can be used as a single unit, in FIG.
An example in which four units are used by vertically stacking the rail rolling directions of the rails of the pair of units at right angles to each other will be described. When the earthquake is not operating, the lower wheels 27a and 27a are equidistant from the lowest concave portion at the center of the lower rail 24, and the upper wheels 27b and 27b are highest concave portion at the center of the upper rail 25. Are equidistant from each other, and the supported body 3 is stationary above the support body 2 in a stable state at the reference state position at the lowest level. When a seismic motion in the left-right direction X occurs, the lower wheels 27a, 27a of the lower unit roll on the concave surface of the lower rail 24, and at the same time, the upper wheels 27b, 27b move to the upper rail 25.
The rolling motion of the concave surface of the bearing causes relative displacement until the maximum displacement, and as a result, the supported body 3 receives the restoring force corresponding to the displacement from the lowest level position and repeats the vibration, while the earthquake motion in the front-rear direction Y occurs. Occurs, the lower wheel 27 of the upper unit
a, 27a and upper wheels 27b, 27b are lower rails 2.
4 and the concave surface of the upper rail 25, and relative displacement is generated until the maximum displacement, and as a result, the supported body 3 receives a restoring force corresponding to the displacement from the lowest level position and repeats vibration, Since the load of the support body 3 does not directly reach the support body 2 and passes between each wheel and the axle, the friction between each wheel and the axle effectively acts as a damping force, and the seismic isolation action works. Left and right direction X
When a seismic motion including two orthogonal components in the front-rear direction Y occurs in combination, the supported body 3 swings to the combined position corresponding to the seismic motion in each direction, and the seismic isolation effect is obtained. work. Here, the seismic isolation device 20 includes a lower wheel 27a,
27a is along the rolling surface 24c, and the upper wheels 27b, 27b
Is along the rolling surface 25c, and the rolling surface 24c and the rolling surface 25c
Since it is possible to independently roll in the opening of substantially constant width in a vertically restrained state, it is possible to downsize the device in the same manner as in the first example, and in addition, it is possible to separate the device from vertical acceleration. Has the effect of blocking.

With respect to FIGS. 9 and 10, the first related to the present invention is shown.
The operation of the three seismic isolation devices 30 will be described. Seismic isolation device 30
Can be used as a single unit, but in FIG. 9, a pair of units are vertically stacked on the support body 2 so that the rolling directions of the wheels of the rails are perpendicular to each other. An example in which a cross shape is crossed below 3 will be described. When the earthquake is not in operation, the lower wheels 37a, 37a are mounted on the lower rail 3.
4 is equidistant from the lowest concave position in the center of the upper rail 37, and the upper wheels 37b and 37b are equidistant from the highest concave position in the center of the upper rail 35. It is stationary above the support 2 in a stable state at the lowest level reference state position. When a seismic motion in the left-right direction X occurs, the lower wheel 3 of the lower unit
7a and 37a roll on the concave surface of the lower rail 34, and at the same time, the upper wheels 37b and 37b roll on the concave surface of the upper rail 35, causing relative displacement until the maximum displacement,
As a result, the supported body 3 repeats vibration by receiving a restoring force corresponding to the displacement from the lowest level position, and when seismic motion in the front-rear direction Y occurs, the lower wheels 37a, 37a of the upper unit.
Also, the upper wheels 37b, 37b roll on the concave surfaces of the lower rail 34 and the upper rail 35 to cause relative displacement until the maximum displacement, and the supported body 3 is displaced from the lowest level position like the lower unit. Since the load of the supported body 3 does not directly reach the support body 2 but passes through between each wheel and the axle, the friction between each wheel and the axle effectively acts as a damping force. Seismic isolation works. Further, when a seismic motion including two orthogonal components in the left-right direction X and the front-rear direction Y is combined and generated, the supported body 3 swings to the combined position corresponding to the seismic motion in each direction. Seismic isolation works. Here, the seismic isolation device 30 includes the lower wheel 3
7a, 37a and a plurality of n upper wheels 37b, 37b are used in series and are suitable for the supported object 3 under heavy load, and a damping force due to friction between each wheel and the axle can be secured. Furthermore, n-1 is attached to the lower axles 38a, 38a and the upper wheels 38b, 38b.
By using the individual reinforcing members 31, it is possible to reinforce each axle and eliminate excessive stress. In addition, each wheel, bearing,
If you prepare the reinforcing material as a part and prepare the specifications in advance,
By appropriately selecting the number corresponding to the withstand load, it is possible to flexibly cope with various withstand loads, and the cost can be reduced.

With reference to FIG. 11, the operation of the seismic isolation device 40 according to the fourth example of the present invention will be described. In the seismic isolation device 40,
Among the constituent elements, the wheel 47, the axle 48, and the reinforcing member 41 are
It is similar to the wheel 37, the axle 38, and the reinforcing member 31 of the fourth example, and operates in the same manner as the seismic isolation device 30 in response to seismic motion, so a detailed description will be omitted, but further the cam portion 50 and the lower guide surface 44b. Also, the upper guide surface 45b is added so that the cam follower 50c of the cam portion 50 can roll smoothly under vertical restraint along the lower guide surface 44b and the upper guide surface 45b in conjunction with the rolling of each wheel due to the occurrence of earthquake motion. it can. As a result, the seismic isolation device 40 has the effect of preventing separation against vertical acceleration in addition to being suitable for heavy loads as in the case of the third example. It is suitable for seismic isolation of supports such as towers and high-rise buildings.

With respect to FIGS. 12A and 12B, the present invention will be described.
The operation of the seismic isolation device 60 of the fifth example will be described. When the earthquake is not in operation, as shown in FIG. 12 (a), the lower wheels 67a, 67a of the seismic isolation device 60 are located at 1/2 e on the left and right, respectively, from the middle position u of the concave lowest portion of the lower rail 64, The upper wheels 67b and 67b are the upper rails 65.
1/2 left and right from the middle position v of the highest concave part
At the position e, i.e., the supported body 3 is stationary above the support body 2 in a stable state at the reference state position at the lowest level. When a seismic motion in the left-right direction X occurs, the lower wheels 67a, 67a roll on the concave surface of the lower rail 64, and at the same time, the upper wheels 67b, 67b roll on the concave surface of the upper rail 65, and further, FIG. Relative displacements are generated until the maximum displacement as shown in FIG. 3, and as a result, the supported body 3 receives the restoring force corresponding to the displacement from the reference state position and repeats vibration. The friction between the axles effectively acts as a damping force and seismic isolation works. The seismic isolation device 60 includes the seismic isolation device of the present invention and the seismic isolation device related thereto.
Shin Although the full stroke of the ground motion assumed in close magnitude device type roller than the wheel type as in the first to fourth examples is adaptable, the size of the housing 66 seismic isolation of the present invention
Device and seismic isolation device related thereto 1st to 4th examples (2nd
The width h is larger than that of
Since it is small, the vertical width can be small, and it is effective when it is necessary to keep the height of the seismic isolation device low. If the same wheels etc. are used, the lower rail 64 and the upper rail 65 can be shared. The cost can be reduced. Further departure
Modification of Seismic Isolation Device Fifth Example Related to Ming The operation of the seismic isolation device 61 is similar to the operation of the seismic isolation device 60. When the earthquake is not activated, as shown in FIG. Lower wheel 67
a and 67a are located at positions 1 / 2g to the left and right from the middle position w of the concave lowest portion of the lower rail 62, and upper wheels 67b and 67b are located to the left and right 1 / m from the middle position z of the concave highest portion of the upper rail 63, respectively. At the position of 2 g, the supported body 3 stands still above the support body 2 in a stable state at the lowest level reference state position. When a seismic motion in the left-right direction X occurs, the lower wheels 67a, 67 (not shown)
a rolls on the concave surface of the lower rail 62, and at the same time, the upper wheels 67b and 67b roll on the concave surface of the upper rail 63, causing relative displacements up to the maximum displacement, and as a result, the supported body 3 moves. Vibration is repeated by receiving a restoring force according to the displacement from the reference state position, and like the seismic isolation device 60, the friction between each wheel and the axle effectively acts as a damping force to act as a seismic isolation.
Like the seismic isolation device 60, the seismic isolation device 61 is also capable of handling all assumed strokes of seismic motion with a size closer to the roller type than the wheel type. Since the size of the housing 69 has a small interval i, the vertical width can be small, which is effective when the height of the seismic isolation device needs to be low. However, there is a drawback that the entire length of the rail and the lateral width of the support material become large. However, the balance of the entire device is stable, and it is suitable for use alone or in a reduced number due to the withstand load.

With reference to FIG. 13, the operation of the seismic isolation device 70 of the sixth example relating to the present invention will be described. When the earthquake is not in operation, as shown in FIG. 13A, the lower wheel 77 of the seismic isolation device 70.
a and 77a are located at positions equidistant from the lowest concave portion of the lower rail 74 to the left and right, respectively.
7b is at a position equidistant from the highest concave portion of the upper rail 75 to the left and right, and the supported body 3 is stationary above the supporting body 2 in a stable state at the reference state position at the lowest level. When a seismic motion in the left-right direction X occurs, the lower wheel 67
a and 67a roll on the concave surface of the lower rail 64, and at the same time, the upper wheels 77b and 77b roll on the concave surface of the upper rail 75, and are relatively moved until the maximum displacement as shown in FIG. 13B. As a result, the supported body 3 repeats the vibration by receiving a restoring force corresponding to the displacement from the reference state position, but the friction between each wheel and the axle effectively acts as a damping force as in the first example. The seismic isolation works. The seismic isolation device 70
The seismic isolation device of the present invention and the seismic isolation device related thereto No. 1
Examples ~ Although the fourth example and is adaptable to the ground motion full stroke of assumed in size close to the type rollers from the wheel type as well, the size of the housing 76 is the isolator and this invention
Seismic isolation devices related to this 1st to 4th examples (excluding 2nd example)
Although the horizontal width is large compared to the above, since the interval j is small and the vertical width can be made small, it is effective when the height of the seismic isolation device needs to be low, and in particular, the upper rail 65 is longer than the total length L of the lower rail 64. This is effective when it is necessary to shorten the total length L'of

[0027]

According to the seismic isolation device of the present invention, since the damping force of the wheel type is effectively used and no special damping device is required, the structure is simple and the size of the device is significantly smaller than the conventional wheel type. Since the size can be made close to that of the roller type, the device can be downsized and can be applied to a wide range of withstand loads from low loads to heavy loads. Further, the configuration of the opening of the rolling surface can prevent separation against vertical acceleration. Further, by arranging a plurality of wheels in series, it is possible to apply to a heavy load supported body, and by appropriately selecting the number, it is possible to flexibly cope with various withstand loads, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a part of a first example of a seismic isolation device related to the present invention,
(A) C-C direction front view, (b) front view, (c) A-
It is an A sectional side view, (d) BB sectional side view.

FIG. 2 is a schematic front view showing the operation of the seismic isolation device of FIG.
(A) Standard state, (b) Intermediate displacement, (c) Maximum displacement.

3A is a schematic plan view of a conventional roller-type seismic isolation device in a reference state, FIG. 3B is a schematic front view of FIG. 3A, and FIG. 3C is a schematic front view of maximum displacement.

4 (a) is a schematic plan view in a standard state in which the first example of the seismic isolation device of FIG. 1 is combined, (b) is a schematic front view of FIG.
(C) It is a schematic front view at the time of maximum displacement.

5 (a) is a schematic front view showing a behavior of a wheel portion of the seismic isolation device shown in FIG. 1, at a middle displacement, (b) a schematic front view at a reference state of (a), and (c) a conventional roller type. It is a schematic front view which shows the behavior of the roller part of a seismic isolation device at the time of intermediate displacement.

FIG. 6 is a schematic front view showing a second example of the seismic isolation device related to the present invention , in which (a) is in a reference state and (b) is at maximum displacement.

7 (a) is a plan view and FIG. 7 (b) is a front view of one example of the seismic isolation device of the present invention.

8 is a partially enlarged view of the seismic isolation device of FIG. 7, (a) DD sectional front view, and (b) EE sectional side view.

FIG. 9 is a third example of the seismic isolation device related to the present invention, (a)
It is a top view and (b) front view.

FIG. 10 is an enlarged view of a wheel portion of the seismic isolation device of FIG. 9, in which (a) a front view, (b) an F-F sectional front view, (c) a plan view, and (d).
It is a GG sectional top view.

FIG. 11 is a fourth example of the seismic isolation device related to the present invention , in which the lower half is shown in a front view and the upper half is shown in a central longitudinal sectional view.

FIG. 12 is a schematic front view showing a fifth example of the seismic isolation device related to the present invention , in which (a) the reference state, (b) the maximum displacement,
(C) In the reference state of the modified example.

FIG. 13 is a schematic front view showing a sixth example of the seismic isolation device related to the present invention, where (a) is in a reference state and (b) is at maximum displacement.

[Explanation of symbols]

1, 10, 20, 30, 40, 60, 61, 70 Seismic isolation device 2 Support body 3 Supported body 4, 24, 34, 44, 62, 64, 74 Lower rail 5, 25, 35, 45, 63, 65, 75 upper rail 6, 16, 26, 36, 46, 66, 69, 76 housing 6a, 16a, 26a, 36a, 46a, 66a, 69
a, 76a Support materials 6b, 36b, 46b Connection materials 7, 17, 27, 37, 47, 67, 77 Wheels 7a, 17a, 27a, 37a, 47a, 67a, 77
a Lower wheels 7b, 17b, 27b, 37b, 47b, 67b, 77
b Upper wheels 7c, 7d, 27c, 27d Flange 8, 18, 28, 38, 48, 68, 78 Axle 8a, 18a, 28a, 38a, 48a, 68a, 78
a Lower axle 8b, 18b, 28b, 38b, 48b, 68b, 78
b upper axle 8c, 18d, 38c, 38d snap ring 9, 29, 39, 50d bearing 22 intermediate member 24a, 25a base portion 24b, 25b rail portion 24c, 25c rolling surface 31, 41 reinforcing member 33 seat plate 36c, 46c, 50b Fastener 44a Lower rail surface 45a Upper rail surface 44b Lower guide surface 45b Upper guide surface 50 Cam part 50a Shaft 50c Cam follower L, L ₀ , L'Total length P, S Single stroke d, e, f, g Distance h, i , J, T interval t width u, v, w, z middle position T interval X left-right direction Y front-back direction

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16F 15/02

Claims (5)

(57) [Claims] 1. A lower base portion that is mounted between a support body and a supported body, is fixed to the support body and extends in a longitudinal direction, a lower rail portion that is erected on the lower base portion, and a central portion of the lower rail portion. Is a lowest part and has a lower rolling surface having an opening of a substantially constant width that gradually increases toward both ends, and an upper base fixed to the supported body and extending in the longitudinal direction. And an upper rail portion which is erected on the upper base portion, and an upper rolling surface which is provided with an opening of a substantially constant width, the central portion of which is the highest portion and which gradually lowers toward both end portions of the upper rail portion. A lower wheel engaging with the lower rolling surface and a lower axle supporting the lower wheel directly or through a bearing. And the upper wheel engaging with the upper rolling surface and the upper wheel directly or via a bearing. And an upper axle parallel to the lower axle and a housing having a supporting member for fixing the lower axle and the upper axle to each other, and each wheel independently rotates around each axle due to earthquake motion. At the same time, the seismic isolation device is characterized in that it rolls along each of the rolling surfaces so that the supported body can be isolated. 2. The seismic isolation device according to claim 1, wherein the lower wheel and the lower axle are each paired, and the upper wheel and the upper axle are each paired. 3. The seismic isolation device according to claim 1, wherein a pair of plate members are used as the supporting member. 4. The seismic isolation device according to claim 1, wherein each axle is fixed to each wheel and each axle is rotated directly or through a bearing in an opening formed in the housing. A seismic isolation device characterized by being movably supported. 5. At least one pair of the seismic isolation devices according to claim 1 is stacked on a support so that the wheel rolling directions of the lower rolling surface and the upper rolling surface are perpendicular to each other. It is characterized in that each wheel is rotated around each axle by seismic motion including two orthogonal component components, and each wheel rolls along each rolling surface so that the supported body can be isolated. Seismic isolation device.