JP2000291736A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize and lighten a base isolation device, improve the stability of, in particular, the device function, and reduce the cost by comprising a tensile force application means located between the other end of a wire and a sliding plate or a supprting base for applying the tensile force to the wire, and returning the supporting base to an original position. SOLUTION: A base isolation device 1 consists of a supporting base 4 placed on a sliding plate 2 through a rolling bearing body 3, the wire fixing parts 5, 5' for regulating an original position of the supporting base 4 to the sliding plate 2, the wire guides 6, 6' fixed to the supporting base 4, the wires 7, 7' mounted between the supporting base 4 and the wire fixing members 5, 5', the guide rollers 8, 8', 9, 9' mounted on the supporting base 4, the coil springs 10, 10' as the tensile force application means for applying the tensile force in the direction of the original point to the wires 7, 7', and the like. The guide members are respectively formed by the wire guide 6 and the guide rollers 8, 9, and the wire guide 6' and the guide rollers 8', 9'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seismic isolation device.

[0002]

2. Description of the Related Art As a seismic isolation device for preventing falls of arts and crafts, such as Buddha statues, precision instruments, chemical liquid tanks, medicine shelves, etc., mounted on a mounting table during an earthquake, for example, 61-7
No. 6122 is disclosed. This seismic isolation device
The upper plate on which the object is placed is slidable relative to the lower plate fixed to the installation surface, and is stretched between these two plates, and a predetermined loop shape is formed according to the relative displacement of both plates. Deforming wire member, biasing means in a direction to restore the displacement,
In this configuration, displacement amount reducing means for reducing the displacement amount is provided.

[0003]

However, the above seismic isolation device has a problem that the structure is complicated, the number of parts is large, and the cost is high. In addition, there is a problem that the height of the device is increased due to the structure, the entire device becomes large, and it is not suitable for a small mounted object. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made to reduce the size and weight, and particularly to reduce the height to improve the stability of the device function and reduce the cost. It is intended to provide a device.

[0004]

According to the present invention, in order to attain the above object, according to the present invention, it is possible to move in a horizontal direction via a plurality of supports on a slide plate fixed to an installation surface. In a seismic isolation device that places a support table and moves the support table according to the horizontal swing of the slide board to reduce the swing of an object placed on the support board, At least two origin return supporting members provided on one of the bases and defining an origin position of the support base with respect to the slide plate, and interposed between the slide plate and the support base, one end of which is the home return support A wire fixed vertically to the member, the other end of which is routed along a facing surface of the slide plate or the support via a guide member provided on one of the slide plate and the support, The other end of the wire and either the sliding plate or the support Is interposed between the person and the tension imparted to the wire, characterized in that said support base and a tensioning means for returning to the home position.

[0005] The support base is movable in a horizontal plane in accordance with the swing of the slide plate by a support body, and tension (restoring force) is applied to the support plate via a wire by a tension applying means, and the support base is moved to the origin position of the slide plate. Is held. When a horizontal swing (vibration) is input to the sliding plate, the support moves to the maximum movement position against the tension by the tension applying means, and at this time, the swing transmitted from the sliding plate is attenuated, The object is prevented from falling. The support base returns to the original position from the maximum position by the tension by the tension applying means.

According to a second aspect of the present invention, the sliding contact portion of the guide member with the origin return supporting member and the guide member is chamfered with a radius of 3 to 10 times the wire diameter. By chamfering the sliding contact portion with the wire with a radius of 3 to 10 times the wire diameter, a large sliding force acts when the movement of the support is large, and a small sliding force acts when the movement of the support is small, The movement of the wire becomes smooth.

According to a third aspect of the present invention, the tension applying means is a spring member. The spring member applies a necessary damping force as a seismic isolation device to the support base by pulling the wire by the elastic force, and smoothly returns the support base to the origin position. According to the fourth aspect of the present invention, there is provided a trigger mechanism for locking the support between the slide plate and the support and releasing the lock of the support when a large swing is input to the slide. It is characterized by being provided.

[0008] The trigger mechanism locks the support base when an input less than or equal to a specified value is applied to the slide board, thereby preventing the support base from swinging due to slight swing of the slide board. The invention according to claim 5 is characterized in that a damper mechanism for applying a frictional force to the movement of the support base is provided between the slide plate and the support base. The damper mechanism applies a frictional force to the movement of the support base 4 to suppress a sudden change, thereby preventing the object to be mounted from falling.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of the seismic isolation device according to the present invention, and FIG. 2 is a diagram illustrating an operation state of the seismic isolation device of FIG. As shown in FIGS. 1 and 2, the seismic isolation device 1 is fixed to a sliding plate 2, a support 4 placed on the sliding plate 2 via a bearing, for example, a rolling bearing 3, and the sliding plate 2. And wire fixing members 5 and 5 'which are support members for returning to the origin as two support points for resetting the origin of the support 4 with respect to the slide plate 2, and the support 4 corresponds to the wire fixing members 5 and 5'. Wire guides 6 and 6 ′ fixed by wire, wire 7 interposed between support base 4 and wire fixing members 5 and 5 ′,
7 ', a guide roller 8 provided on the support base 4 and serving as a routing direction changing means for changing the routing direction of the wires 7, 7';
8 ', 9, 9' and coil springs 10, 10 'as tension applying means for applying tension to the wires 7, 7' in the direction of the origin position. The wire guide 6, the guide rollers 8, 9 and the wire guide 6 ', the guide rollers 8', 9 'constitute guide members respectively.

As shown in FIGS. 3 and 4, the sliding plate 2 is
It is a square-shaped thick plate made of, for example, a stainless steel member having rust resistance, and is fixed to a floor as an installation surface. The support base 4 is a square thick plate smaller than the slide plate 2 and is made of, for example, a synthetic resin member such as a transparent acrylic resin member, and includes four rolling bearing members 3 fixed to four corners on the lower surface. On the sliding plate 2 in all directions (3
(60 °). On the lower surface of the support 4, for example, on a straight line LF connecting the centers of the front left and right rolling bearings 3, 3 and the rear left and right rolling bearings 3,
The wire guides 6 and 6 'are provided at respective center positions PF and PR on a straight line LR connecting the centers of the three. On the lower surface of the support 4, concave portions 4 a and 4 b are provided on both sides of one diagonal line in parallel along the diagonal line.
Pins 11 and 11 'are suspended from the respective start ends of a and 4b. In the case where small and lightweight arts and crafts are placed, the support 4 is made of a transparent member, so that maintenance and the like can be facilitated and the weight can be reduced.

As shown by a two-dot chain line in FIG. 3, a spring member, for example, a disc spring 1 is provided between the rolling bearing body 3 and the support base 4.
The vibration of the support table 4 in the vertical direction can be attenuated by interposing the support 2. Further, the seismic isolation device 1 shown in FIG. 3 may be arranged upside down, that is, the support table 4 may be fixed and the upper surface thereof may be fixed to an installation surface such as a floor, and the slide plate 2 may be used as a mounting table. Good. Further, in this case, the support 4
May be housed in a concave portion provided on the installation surface, and the slide plate 2 may be movable with a slight gap from the installation surface. Etc. can be arranged at substantially the same height as the installation surface.

As shown in FIG. 5, the wire guide 6 has a substantially concave shape when viewed from the side, a wire insertion hole 6b is vertically formed in the bottom 6a, and the lower opening end 6c has a predetermined radius R (corner R).
Diameter). The wire 7 can be inserted through the wire insertion hole 6b with a slight gap. Also,
The radius of the corner R is 3 to 10 times the outer diameter (wire diameter) D of the wire 7 as described later. The guide roller 8 is
It is housed in the recess of the wire guide 6 and is rotatably supported in a vertical plane by the shaft 12 so that the vertical tangent to the wire hooking groove 8a is positioned at the center of the wire insertion hole 6b.
It is arranged above the wire insertion hole 6b. In the wire guide 6, the wire insertion hole 6b is located directly below the center position PF, and the groove 8a of the guide roller 8 is disposed directly below the straight line LF along the straight line LF, and is fixed to the lower surface of the support base 4. ing. Wire guide 6 'is also wire guide 6.
It is configured similarly to.

The guide roller 9 is rotatably supported on the lower surface of the support base 4 in a horizontal plane, and the tangential direction of the wire hooking groove 9a formed on the outer peripheral surface is the center of the straight line LF and the center of the concave portion 4a. It is arranged to match the line. The guide roller 9 'is also arranged similarly to the guide roller 9.
Returning to FIG. 1, the support base 4 is disposed at the center position of the slide plate 2 and the state is defined as the origin position with respect to the slide plate 2. 'Matches. In the state in which the support base 4 is located at the origin position, the wire fixing member 5 has a slight gap at a position directly below the wire insertion hole 6b of the wire guide 6, as shown in FIG. It is provided.

As shown in FIG. 5, the wire fixing member 5 has a wire insertion hole 5c formed through the center of the head 5a and the shaft 5b, and the upper open end 5d is chamfered with the predetermined radius R. Have been. Then, one end of the wire 7 is inserted into the wire insertion hole 5c and is firmly fixed. The wire fixing member 5 has a shaft portion 5b fitted and fixed in a hole 2a formed in the slide plate 2.

The wire 7 extends vertically upward from the wire insertion hole 5c of the wire fixing member 5, passes through the wire insertion hole 6b of the wire guide 6, is wrapped around the guide roller 8, and is turned in the horizontal direction. As shown in FIG. 4, it extends toward the center of the side along the lower surface of the support 4 and is extended around the guide roller 9 to extend into the recess 4a.
a is fixed to one end of the coil spring 10 housed in a. The other end of the coil spring 10 is locked on a pin 11. The wire 7 is tensioned by a coil spring 10 in the direction of arrow A and pulled.
The guide rollers 8 and 9 constitute a direction changing mechanism of the wire 7. The same applies to the wire fixing member 5 ', the wire 7', and the coil spring 10 '.

The most suitable coil springs 10 and 10 'are selected in accordance with the weight of the object placed on the support 4 and the seismic isolation cycle of the seismic isolation device 1. And coil spring 1
By setting the spring force of 0 and 10 'to the optimum value, it is possible to appropriately cope with displacement (shake) due to an earthquake or the like. Note that the coil springs 10 and 10 ′ are
Although it is not always necessary to store the support 4 in the recesses 4a and 4b when the winding diameter is large, the height of the support 4 from the slide plate 2 can be reduced. Becomes possible. That is, the height of the seismic isolation device 1 can be significantly reduced (about 50 cm).

As shown in FIG. 6, a trigger mechanism 15 is provided between the slide plate 2 and the support 4. The trigger mechanism 15 holds the support 4 in a stationary state when the swing of the slide plate 2 is equal to or less than a specified value, and moves the support 4 when the shake exceeds the specified value, that is, enables the seismic isolation device 1 to operate. For example, it is configured by a trigger pin 16 formed of a synthetic resin member. The lower end of the trigger pin 16 is fitted into the hole 2 e of the slide plate 2 while the support base 4 is at the origin position of the slide plate 2, and the upper end of the trigger pin 16 is the hole 4 e of the support base 4.
And the support base 4 is locked to the slide plate 2. The trigger pin 16 is broken when the swing of the slide plate 2 becomes larger than a specified value, thereby enabling the movement of the support 4.

This prevents the support base 4 from being displaced by small vibrations. By providing a notch 16a at an appropriate position of the trigger pin 16 and breaking at the notch 16a, it is easy to take out the bent piece from the hole 2e at the time of resetting, and the trigger pin 16 is easily replaced. . In this way, the support table 4 is placed on the slide plate 2.
Are mounted, and wire fixing members 5, 5 ', wire guides 6, 6', wires 7, 7 ', guide rollers 8, 8',
9, 9 'and coil springs 10, 10' are arranged symmetrically with respect to the origin O of the slide plate 2. Also,
By arranging the wires 7, 7 'and the coil springs 10, 10' on a diagonal line (45 °) of the support 4, the length can be maximized. That is, FIG. 4 shows a mounting arrangement of the most compact parts according to the maximum movable distance of the support 4.

While the support 4 is displaced from the origin position shown in FIG. 1 to the maximum displacement position shown in FIG. 2, none of the rolling bearing members 3 interferes with the wire fixing members 5, 5 'of the slide plate 2. It is necessary. As shown in FIG. 1, the mounting position of the wire fixing members 5 and 5 ′ is such that the support 4 is
It is necessary that the position be the furthest from the origin position O of the slide plate 2 and the furthest from each rolling bearing body 3 in the state of holding at the origin position. Therefore, in the embodiment shown in FIG. 1, the wire fixing members 5, 5 'are located at intermediate positions between the left and right rolling bearings 3, 3, and the distance (distance) therebetween is shown in FIG.
Is longer than the maximum displacement amount of the support 4 shown in FIG.

Therefore, as shown in FIG. 1, when the support table 4 is located at the origin position of the slide plate 2, each rolling bearing 3
L between wire and wire fixing member (origin return support member) 5
Is set to be longer than the moving distance Lm when the support 4 moves the maximum distance as shown in FIG. This prevents the rolling bearing 3 from interfering with the wire fixing members 5, 5 'when rolling on the slide plate 2.

Next, the chamfering R provided at the opening end 5d of the wire insertion hole 5c of the wire fixing member 5 and the opening end 6c of the wire insertion hole 6b of the wire guide 6 shown in FIG. I do. (1) As a general characteristic, the following can be said of the seismic isolation device 1 in relation to the movement of the support base 4 depending on the size of the corner R diameter. I. When the R diameter is small: 1) When the R diameter is too small, the wire 7 is easily worn and damaged. 2) When the movement of the support 4 is large, the sliding resistance of the wire 7 becomes large, and the support 4 becomes difficult to move. 3) When the movement of the support 4 is small, the movement of the wire 7 is smooth. 4) When the support base 4 returns to the original position, the wire 7 is less likely to return to the original position because the deflection of the wire 7 is small. B. When the R diameter is large 1) When the support 4 returns to the origin position, it is difficult to return to the origin because the wire 7 is largely shaken. 2) When the movement of the support 4 is large, the movement of the wire 7 is smooth. (2) Proper Range of Corner R Diameter The proper range of the corner R diameter is shown in FIG. 7 under the conditions of the safety factor of the wire 7, the return to origin, and the condition that the support 4 returns within the displacement of 1 mm. 7, the horizontal axis corner R diameter (multiple of the wire diameter D), the safety factor of the wires on the vertical axis (= 10 ⁷ fatigue strength / stress produced) and homing properties (= 1 / (sliding resistance / restore Power))
Then, the wire safety factor changes as shown by the straight line I, and the return-to-origin changes as shown by the curve II. As is clear from this characteristic diagram, the range of the corner R diameter which satisfies the range where the wire 7 does not break and the range where the return to origin is within 1 mm is 3D to 10D.

The operation will be described below. When the slide plate 2 is stationary as shown in FIG. 1, the support 4 is located at the origin position of the slide plate 2. That is, wire 7,
7 ′ is an arrow A by the coil springs 10 and 10 ′,
A 'is pulled in the opposite direction, indicated by A', FIG.
As shown in FIG. 8A, one end 7 a rises vertically from the wire fixing member 5, vertically passes through the wire insertion hole 6 b of the wire guide 6, and is turned horizontally by the guide roller 8. In this state, the length of the wire 7 between the wire fixing member 5 and the guide roller 8 is minimized. The same applies to the wire 7 '. Wire 7, 7 '
Is that the wire fixing members 5, 5 'and the guide rollers 8, 8' are arranged at symmetrical positions with respect to the origin position O, and the coil springs 10, 10 'have the same characteristics, so that even tension is applied. The support 4 is supported at the origin position. The trigger pin 16 holds the support 4 at the origin position. An object (not shown) such as a work of art is placed on the support 4.

In this state, the slide plate 2 is displaced in the direction of arrow B as shown in FIG. 2 due to an earthquake, for example, and when its size exceeds a predetermined size, the trigger pin 16 breaks,
The locking force for locking the support 4 to the slide plate 2 is released. The support base 4 can be relatively displaced (moved) horizontally in all directions (360 °) with respect to the slide plate 2 by the rolling bearing body 3, and is substantially stationary even if the slide plate 2 is displaced in the arrow B direction. Held in state. When the slide plate 2 is displaced in the direction of arrow B, the wires 7, 7 '
It is pulled in the direction of arrow B against the spring force of 0, 10 ',
As shown in FIG. 8B, the relative position between the wire fixing member 5 and the wire guide 6 changes. Then, the displacement of the slide plate 2 in the direction of the arrow B is attenuated by the spring force of the coil springs 10 and 10 ′ and transmitted to the support 4.

Since the open ends 5d and 6c of the wire insertion holes 5c and 6b of the wire fixing member 5 and the wire guide 6 are chamfered with a radius R, the wire 7 is smoothly curved and the inside of the wire insertion hole 6b is formed. Can be slid smoothly. The wire 7 is connected to the opening end 6c of the wire insertion hole 6b (corner R).
, A sliding resistance is generated and a braking action is generated. The wire 7 'operates similarly to the wire 7. As the displacement of the slide plate 2 in the direction of arrow B increases, the wires 7, 7 'of the support table 4 are pulled, and can be displaced to the maximum displaced position shown in FIG.

As shown in FIG. 8 (c), the wire 7 is tilted to near the horizontal state as the displacement of the support 4 increases, and the upper surface of the head 5a of the wire fixing member 5 and the wire guide 6 Abuts on the open end face (corner diameter R) of the wire insertion hole 6b, thereby increasing the sliding resistance (braking force).
As a result, the deceleration force increases as the support 4 approaches the maximum displacement position shown in FIG. The same applies to the wire 7 '. Thus, the vibration to the support table 4 is isolated, that is, the seismic energy is attenuated, and the object to be mounted is prevented from falling.

As shown in FIGS. 1 and 2, when the support table 4 is located at the origin of the slide plate 2, the distance L between each of the rolling members 3 and the wire fixing members 5, 5 'is supported. Stand 4
Is set to be larger than the moving distance Lm at the time of moving the maximum distance, thereby preventing each rolling bearing body 3 from interfering with the wire fixing members 5, 5 'when rolling on the slide plate 2. You.

As shown in FIG. 2, after the support table 4 is displaced relative to the slide plate 2 to the maximum displacement position,
When the displacement in the direction of arrow B is completed, the wires 7, 7 'are pulled by the spring force of the coil springs 10, 10', and the support 4 is returned to the original position. At this time,
Since the wires 7, 7 'are in contact with the open end surfaces (corners R) of the wire insertion holes 6b, 6b' of the wire guides 6, 6 ', the sliding resistance (braking force) is large, and the maximum displacement of the support base 4 is achieved. The return speed from the position to the origin position is reduced and gradually approaches, and as it approaches, the state shown in FIG. 8B is reached, and the sliding resistance gradually decreases. The same applies to the displacement of the slide plate 2 in a direction other than the arrow B direction. This prevents the object placed on the support base 4 from falling over. Note that an air brake such as a piston may be connected to the coil spring 10 to have a damper function.

Further, since the support base 4 is tensioned by the wires 7, 7 'and the coil springs 10, 10', the support base 4 is prevented from being lifted up and also against the vertical swing of the slide plate 2. Available. The support 4 is
Since the wire fixing members 5, 5 'are arranged at positions symmetrical to the origin position O of the slide plate 2 and extend perpendicularly from the slide plate 2, the wire fixing members 5, 5' are returned to substantially the original origin positions. After the support base 4 is finally accurately returned to the home position by manual adjustment, a new trigger pin 16 is mounted between the support base 4 and the slide plate 2 and locked at the home position.

FIG. 9 shows an example of the relationship between the restoring force and the displacement of the seismic isolation device 1. FIG. 9 is a characteristic diagram when the displacement (horizontal movement) of the slide plate 2 is plotted on the horizontal axis, the load acting on the support 4 in the horizontal direction and the hysteresis are plotted on the vertical axis, and the corner radius is kept constant. It is. Curve I is the spring tension F0 of the spring 10, curve II is the friction force F 'acting between the corner R and the wire 7, and curve III is the restoring force Fx (+) of the seismic isolation device 1.
The curve IV indicates the restoring force Fx (−) of the seismic isolation device 1 (the load acting on the support 4 when the support 4 moves away from the origin) (in the direction in which the support 4 approaches the origin). The load acting on the support base 4 when moving) and the curve V represent hysteresis (%).

FIG. 10 shows an example of measured values of the damping characteristics of the seismic isolation device 1. In FIG. 10, the horizontal axis indicates elapsed time (sec), and the vertical axis indicates amplitude (cm). A curve I indicates the attenuation characteristic of the support 4 in an “empty” state in which no object is mounted on the support 4, and a curve II indicates that the object is mounted on the support 4. It shows the damping characteristic of the support 4 when the “product” (about 4 kg) is present. As is clear from this characteristic diagram, the seismic isolation device 1 can provide about 7% attenuation without adding a special damper function. Of course,
As described above, if the seismic isolation device 1 requires further attenuation, the attenuation can be adjusted by providing a damper mechanism, a brake mechanism, and the like.

FIGS. 11 and 12 show examples of experimental results of horizontal vibration of the seismic isolation device 1. FIG. FIG. 11 shows a horizontal vibration device, in which the seismic isolation device 1 is installed on a vibration table 50 that can vibrate in the horizontal direction, and a weight 51 is placed on the support table 4 as an object to be mounted. Acceleration sensor 5 on body 51
2 and 53 are attached. Acceleration sensor 52
Detects the input acceleration (gal) of the shaking table 50, and the acceleration sensor 53 detects the response acceleration (gal) of the support table 4.
FIG. 12 shows a measurement result of the seismic isolation device 1 when a horizontal vibration is input to the shaking table 50 as a seismic wave. Usually, such a seismic isolation device has a response acceleration of 200 (gal).
The following are required: As is clear from the measurement results shown in FIG.
The value of 0 (gal) or less is sufficiently satisfied, and the seismic isolation effect (response acceleration / input acceleration) is 1/4 to 1/5, which is extremely excellent.

By the way, it is necessary to take good measures against the shape of the object placed on the support 4 and the deviation of the center of gravity. The shape of the object placed on the support 4 is various, and the position of the center of gravity is also various. Therefore, in order not to apply a rotational moment to the support 4, two or more origin return support points are required. Further, it is necessary to match the center of gravity of the restoring force with the center of gravity of the object to be mounted.

In the embodiment, the configuration is described in which the rolling support 3 is arranged at the four corners of the square support 4 and the wire fixing members 5 and 5 'are provided on the slide plate 2 as support points for returning to the origin. . However, considering the position of the center of gravity due to the symmetrical and asymmetric shape change of the object to be seismically isolated, setting the mounting position and number of the rolling bearings and wire fixing members, etc., is optimal for the object to be mounted A seismic isolation device can be configured, and the object can be more effectively prevented from falling.

FIG. 13 shows an example of an origin return support point corresponding to the shape of the object to be mounted and the deviation of the center of gravity.
Is the support point for returning to the origin, the symbol W is the object to be mounted, and the symbol +
Represents the center point of the combined restoring force. FIG.
(A) shows the case where the above-mentioned origin return support points are two,
(B) shows a case where the number of the origin return support points is three.
(C) shows a case where there are four support points for returning to the origin, the object placed on the support table 4 is symmetrical, and has an equal load.
Indicates a case where a rectangular support table is used, the origin return support points are four places, and the object to be mounted on the support table 4 is asymmetrical and has an uneven load. Further, FIG. 14 shows the origin return support point P, the coil spring S, and the fixed point S of the coil spring S of the support base 4 when there are four origin return support points shown in FIG.
0 shows an example of the arrangement of wires W, and guide rollers GR.

Further, it is possible to change the magnitudes of the damping force and the frictional force required when the support 4 is displaced on the slide plate 2 and restored. FIG. 15 shows that the mounting position of the guide roller 8 is shifted from the position directly above the wire fixing member 5, that is, the vertical tangent position of the wire hooking groove 8 a of the guide roller 8 is changed to the wire insertion hole 6 b of the wire guide 6. Are shifted toward the center position PF along the straight line LF shown in FIG. 4 and the opening ends 6c 'and 6c above and below the wire insertion hole 6b.
The configuration is such that corners R are provided in c. With such a configuration, the frictional force between the wire fixing member 5, the wire 7, and the wire guide 6 can be reduced. The same applies to the guide roller 8 '.

FIG. 16 shows a structure in which a damper mechanism 17 is provided between the guide roller 8 and the support table 4. A damper member 18 is pressed against the side surface of the guide roller 8 by a spring 19 to apply a frictional force to the support. The damping force (braking force) is applied to the platform 4. Note that a damper mechanism may be provided between the guide roller 9 and the support 4. Further, instead of the damper mechanism 17, the guide roller 8 having a built-in brake is provided.
Or 9 may be used.

FIG. 17 shows a structure in which a damper mechanism 20 is provided between the slide plate 2 and the support 4, and a damper member 21 provided on the support 4 is spring 22 to slide the slide surface (upper surface) of the slide 2. And a frictional force is applied to the support base 4 to apply a damping force (braking force) to the support base 4. FIG.
Shows another embodiment of the trigger mechanism. Trigger mechanism 24
Is a magnet type, and a magnet 25 is provided on the slide plate 2 side and a magnet 26 is provided on the support base 4 side so as to be attracted to each other. The magnet 26 applies a spring force in a direction away from the magnet 25 by a spring 27. Has been granted. The spring force of the spring 27 is
The force is set smaller than the attraction force between the magnets 5 and 26, and is held on the support base 4 when the magnet 26 separates from the magnet 25. Further, a reset knob 28 is provided on the magnet 26.

When the swing (input) of the slide plate 2 is small and equal to or less than a specified value, the magnet 26 is attracted to the magnet 25, and the support 4 is locked at the origin position. When the swing of the slide plate 2 becomes large and exceeds the specified value, the magnet 26 separates from the magnet 25 and is lifted upward and held by the spring force of the spring 27. This allows
The engagement between the slide plate 2 and the support 4 is released. At this time,
Since the magnet 26 is pulled up, contact with the upper surface (sliding surface) of the slide plate 2 and the like are prevented, so that the slide plate 2 is prevented from being damaged.

When the support base 4 is locked at the origin position, the magnet 26 is positioned above the magnet 25, and the set knob 28 is pushed to push down the magnet 26 against the spring force of the spring 27 to be attracted to the magnet 25. Thereby, the support base 4 can be locked to the slide plate 2. According to such a configuration, it is possible to easily and inexpensively configure the trigger mechanism.

In the above embodiment, the support 4 is formed in a square shape, and the wires 7, 7 ', the coil springs 10, 1
Although 0 'is arranged diagonally (45 °), it is not limited to this. However, by adopting the structure as in the embodiment, the size can be reduced. The means for applying tension to the wires 7, 7 'is not limited to a coil spring, but other tension applying means, for example, a plate spring (spring) or the like may be used.

Although the guide rollers 8 and 9 are used as the direction changing means of the wire 7, pins or the like fixed to the support 4 may be used instead of the guide rollers. However, it is preferable to use a guide roller as in the embodiment, since friction of the wire is reduced and abrasion is prevented. Further, by interposing a spring member such as a disc spring 12 between the rolling bearing body 3 and the support table 4, it is possible to absorb vibration in the vertical direction more favorably and to perform seismic isolation.

Further, in the above embodiment, the wire fixing members 5, 5 'as support points for returning to the origin are provided on the slide plate 2 side.
Wire guides 6, 6 'on the side, guide rollers 8, 8',
9 and 9 'and the coil springs 10 and 10' are arranged, but are not limited thereto.
Wire guides 6, 6 'on the side, guide rollers 8, 8',
9, 9 'and coil springs 10, 10', and wire fixing members 5, 5 'may be arranged on the support base 4 side.

Further, in the above-described embodiment, the seismic isolation device for a small and lightweight object to be mounted has been described. However, the present invention is not limited to this, and is applicable to a large-scale structure such as a building. Of course, it is also applicable. Furthermore, in the above embodiment, the case where the rolling bearing 3 is used as the bearing for supporting the support 4 has been described. However, the present invention is not necessarily limited to the rolling bearing, and other structures such as a sliding bearing may be used. May be used.

[0044]

As described above, according to the first aspect of the present invention,
Therefore, it is possible to improve the stability of the function of the seismic isolation device and the stability of the object to be mounted, because the structure is simple, the size and the weight can be reduced, and the height can be reduced. Can be. Further, cost can be reduced.

According to the second aspect of the present invention, since the sliding contact portion with the wire is chamfered with a radius of 3 to 10 times the wire diameter, a large sliding force acts when the movement of the support is large, and the movement of the support Is small, a small sliding force acts, and the movement of the wire becomes smooth, and accordingly, the movement of the support stand becomes smooth. According to the third aspect of the present invention, by using a spring member as the tension applying means, the necessary damping force as the seismic isolation device can be applied, and the support base can be smoothly returned to the origin position with a simple configuration.

According to the fourth aspect of the present invention, a slight swing of the slide plate is provided by providing a trigger mechanism between the slide plate and the support base to lock the support base when a large swing is input to the slide plate. Can be prevented from swinging. According to the fifth aspect of the present invention, by providing the damper mechanism between the slide plate and the support, it is possible to suppress the rapid movement of the support 4 and to properly prevent the object to be overturned. is there.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a seismic isolation device according to the present invention.

FIG. 2 is an explanatory diagram showing the operation of the seismic isolation device shown in FIG.

FIG. 3 is a front view of the seismic isolation device of FIG.

FIG. 4 is a bottom view of a support base of the seismic isolation device of FIG.

FIG. 5 is a cross-sectional view of an origin returning support member of the seismic isolation device of FIG.

FIG. 6 is an explanatory view showing an example of a trigger mechanism interposed between the slide plate and the support table of FIG. 1;

FIG. 7 is a characteristic diagram showing a relationship between a wire shown in FIG. 5 and a radius R of a guide member.

8 is an operation explanatory view of the home return support member of FIG. 5 when the seismic isolation device shown in FIG. 2 is operated.

FIG. 9 is a characteristic diagram showing an example of a relationship between a restoring force and a displacement of the seismic isolation device of FIG.

FIG. 10 is a characteristic diagram showing an example of a vibration damping characteristic of the seismic isolation device of FIG.

11 is an explanatory view in which the seismic isolation device shown in FIG. 1 is installed in a horizontal vibration device.

12 is a diagram illustrating an example of a measurement result of the seismic isolation device by the vibration device of FIG. 11;

FIG. 13 is an explanatory view showing another example of the origin return support point of the seismic isolation device according to the present invention.

FIG. 14 is a diagram illustrating an example of the arrangement of the origin return support points, coil springs, and guide rollers when four origin return support points are provided.

FIG. 15 is a sectional view showing another embodiment of the origin return support member and the wire of FIG. 5;

FIG. 16 is an explanatory view showing an example of a damper mechanism of the support stand of FIG. 1;

FIG. 17 is an explanatory view showing another embodiment of the damper mechanism of the support stand of FIG. 1;

FIG. 18 is an explanatory view showing another embodiment of the trigger mechanism interposed between the slide plate and the support of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Sliding plate 3 Rolling support body (support body) 4 Support base 5 Wire fixing member (home return support member) 6 Wire guide 7 Wire 8, 9 Guide roller 10, 10 'Coil spring 15, 24 Trigger mechanism 16 Trigger pin 17, 20 Damper mechanism 25, 26 Magnet 50 Vibration table 51 Plumb (substrate) 52, 53 Acceleration sensor

Continuation of the front page (72) Inventor Manabu Inaba 4-640 Shimoseito, Kiyose-shi, Tokyo F-term in Obayashi Corporation Technical Research Institute Co., Ltd. (reference) 3J048 AA03 AB07 BC03 BG02 BG04 CB30 EA13

Claims (5)

[Claims] 1. A support table is mounted on a slide plate fixed to an installation surface via a plurality of supports so as to be movable in a horizontal direction, and the support table is moved in accordance with horizontal swing of the slide plate. In a seismic isolation device that reduces the swing of an object placed on the support table by moving the support table, the base apparatus is provided on one of the slide plate and the support table, and defines an origin position of the support table with respect to the slide plate. At least two return-to-origin support members, interposed between the slide plate and the support, one end of which is vertically fixed to the return-to-origin support member, and the other end is provided on one of the slide plate and the support. A wire routed along the facing surface of the slide plate or the support via the provided guide member, and interposed between the other end of the wire and the other of the slide plate or the support. Apply tension to the wire and move the support base to the origin. A seismic isolation device comprising: tension applying means for returning to a position. 2. The relief according to claim 1, wherein a sliding contact portion of the guide member with the origin return supporting member and the guide member is chamfered with a radius of 3 to 10 times a wire diameter. Quake device. 3. The seismic isolation device according to claim 1, wherein said tension applying means is a spring member. 4. A trigger mechanism is provided between the slide plate and the support table for locking the support table and releasing the lock of the support table when a large swing is input to the slide plate. The seismic isolation device according to any one of claims 1 to 3, wherein 5. The relief according to claim 1, wherein a damper mechanism for applying a frictional force to the movement of the support base is provided between the slide plate and the support base. Quake device.