JPH0989028A - Sliding mechanism, earthquake isolation device and dumping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a friction force between a sliding part and a fixed surface to an optional size according to the weight of an article to be loaded. SOLUTION: An earthquake isolation device 1 includes a fixed base 4 fixed on a floor 2, a sliding plate 5 provided in each corner part of the fixed base 4, a sliding base 6 supported in the upper side of the fixed base 4 so as to face the fixed base 4 and be freely slid, sliding mechanisms 7a and 7b provided in the respective corner parts of the bottom surface of the sliding base 6 and a pressing mechanism 8 for pressing the sliding base 6 in a direction for making the center thereof coincide with the center of the fixed base 4. Each of the sliding mechanisms 7a and 7b has a spring force adjusting mechanism 13 for adjusting the spring force of a coil spring 12 for pressing down a sliding member. Since a friction force is adjusted by this spring force adjusting mechanism 13, the sliding resistance of the sliding base 6 against the fixed base 4 is set to a constant value irrespective of the weight of an article 3 to be loaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding mechanism, a seismic isolation device, and a vibration damping device configured such that a sliding portion and a fixed surface are displaced relative to each other according to the magnitude of input vibration.

[0002]

2. Description of the Related Art When an important electronic device such as a computer or an art object such as an expensive Buddhist image is installed, it is necessary to take measures to prevent the electronic device or the Buddhist image from collapsing due to a vibration when an earthquake occurs. is there. As a general measure against earthquakes, electronic equipment or Buddhist statues are placed on a seismic isolation base, or the floor structure is used as a seismic isolation structure, or a damping device is installed in the building. There is a way to dampen the whole.

The seismic isolation device has a sliding portion slidably provided on a fixed surface placed on the floor surface, and an electronic device or a work of art (hereinafter referred to as "mounted surface") is provided on the upper surface of the sliding portion. "Figurine")
There is a small seismic isolation table that can be placed individually, and the sliding mechanism that relatively displaces the sliding part and the fixed surface according to the magnitude of the input vibration prevents the placed object from collapsing. Is configured to. There is also a large seismic isolation device configured to isolate the entire building, and its configuration is almost the same as the seismic isolation table.

In the seismic isolation device having such a structure, since the frictional force between the sliding portion and the fixed surface fluctuates according to the weight of the mounted object, for example, friction against the weight of the mounted object. If the force is large, sufficient seismic isolation will not be obtained even if vibration is input at the time of an earthquake, or if the frictional force against the weight of the mounted object is small, it will slide when a large earthquake occurs. The part may slide too much on the fixed surface and the placed object may collide with another object such as a wall. Further, the frictional force needs to be changed according to the magnitude of vibration of the fixed surface to be isolated.

Therefore, in the seismic isolation device, the frictional force between the sliding portion and the fixed surface is set to an arbitrary value depending on the weight of the object to be mounted so that the seismic isolation operation can be performed reliably and smoothly when an earthquake occurs. It is necessary to set to, and when the actual friction force does not match the friction force at the time of design, it is necessary to change the friction force. Therefore, conventionally, when installing a seismic isolation device, the material of the friction material provided in the sliding portion is changed according to the weight of the mounted object, or the total weight is changed, or the fixed surface is changed. Friction force adjustment work such as changing the effective area of the sliding friction material was performed.

Further, the vibration damping device has a structure in which an additional mass having a predetermined weight is supported by laminated rubber and a friction member is provided between the additional mass and the building. When the building is vibrated due to earthquake, wind, or traffic vibration, the added mass oscillates due to elastic deformation of the laminated rubber, and the vibration of the building is damped. In the vibration damping device having such a configuration, it is necessary to adjust the frictional force as the damping force generated by the friction member according to the weight of the additional mass.

[0007]

However, in the seismic isolation device, in order to set the frictional force between the sliding portion and the fixed surface to an arbitrary magnitude according to the weight of the mounted object, seismic isolation is required. When installing the device, it is necessary to change the material of the friction material according to the weight of the object to be placed, change the overall weight, or change the effective area of the friction member. It is necessary and there is a problem that installation work takes a long time.

When the object to be placed is to be replaced with another object after installation, the seismic isolation device must be disassembled and the friction force adjustment work must be performed each time the friction force is readjusted. Readjustment work was troublesome. Further, in the vibration damping device as described above, since it is necessary to change the material of the friction member according to the weight of the added mass, it is a considerable effort to manufacture the friction member suitable for the structure of the building. In addition to requiring the friction member, if the natural period of the building changes after the friction member is manufactured and it is necessary to change the friction force by the friction member or if you want to change the characteristics of the vibration damping device itself, the friction force generated by the friction member There is a problem that it is difficult to adjust and it is not possible to deal with it.

Therefore, an object of the present invention is to provide a sliding mechanism, a seismic isolation device, and a vibration damping device that solve the above problems.

[0010]

In order to solve the above problems, the present invention has the following features. The invention of claim 1 has a sliding portion slidably provided on the fixed surface, and the sliding portion and the fixed surface are relatively displaced according to the magnitude of the input vibration. In the dynamic mechanism, frictional force adjusting means for adjusting a frictional force of the sliding portion with respect to the fixed surface is provided in the sliding portion.

Therefore, according to the first aspect of the present invention, since the frictional force adjusting means for adjusting the frictional force of the sliding portion with respect to the fixed surface is provided, the frictional force adjusting means for adjusting the frictional force between the sliding portion and the fixed surface is provided according to the weight of the object to be placed. The frictional force can be adjusted to any magnitude, and the frictional force can be easily adjusted even if the object to be placed is replaced and the weight is changed after installation.

The invention according to claim 2 is the sliding mechanism according to claim 1, wherein the frictional force adjusting means comprises a sliding leg that slides on the fixed surface, and a vertical movement on the sliding leg. A friction member that is displaceable in any direction and slides on the fixed surface; a spring member that presses the friction member against the fixed surface; and a spring force adjustment mechanism that adjusts the spring force of the spring member. It is characterized by.

Therefore, according to the second aspect, the friction force of the friction member sliding on the fixed surface can be adjusted by adjusting the spring force of the spring member. It can be adjusted to an arbitrary size according to the weight of the placed object, and the frictional force adjustment time can be shortened.

The invention of claim 3 is a seismic isolation device having the sliding mechanism according to claim 1 or claim 2. Therefore, according to the third aspect, in the seismic isolation device, the friction force of the friction member sliding on the fixed surface can be adjusted by adjusting the spring force of the spring member. The force can be adjusted to any size according to the weight of the mounted object, and the frictional force adjustment time can be shortened.

According to a fourth aspect of the present invention, in a vibration damping device in which an additional mass having a predetermined weight is supported by laminated rubber, a sliding portion that slides on the fixed surface is provided on the additional mass, and the sliding portion is provided. The vibration damping device is characterized in that frictional force adjusting means for adjusting the frictional force is provided on the sliding portion.

Therefore, according to the present invention, in the vibration damping device, since the frictional force adjusting means for adjusting the frictional force of the sliding portion is provided in the sliding portion, the frictional force can be adjusted to an arbitrary magnitude. The damping force of the vibration damping device itself can be adjusted.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view of a seismic isolation device as a first embodiment of the present invention, and FIG. 2 is a plan view of the seismic isolation device of the first embodiment. The seismic isolation device 1 is installed on a floor 2 of a building, and an electronic device such as a computer or a work of art such as a Buddhist image is placed as a placement object 3. That is, the seismic isolation device 1 is used as a seismic isolation stand that supports the mounted objects 3 so as to isolate them individually.

The seismic isolation device 1 includes a fixed base 4 fixed to the floor 2, a flat slide plate 5 provided at each corner of the upper surface of the fixed base 4 and made of a low friction material, and the fixed base 4. A sliding base (sliding part) 6 facing the fixed base 4 and slidably supported above, and sliding mechanisms 7a to 7d provided at respective corners of the lower surface of the sliding base 6, The moving base 6 includes a biasing mechanism 8 that biases the center of the moving base 6 in a direction coinciding with the center of the fixed base 4.

On the upper surface of the sliding base 6, a vertically long computer device or a glass case or the like accommodating a Buddhist image or the like is mounted as a mount 3. The urging mechanism 8 is 4
Each of the coil springs 9a to 9d includes a coil spring 9a.
9d are stretched so as to extend in a diagonal direction of the fixed base 4 and the sliding base 6. That is, one end of each of the coil springs 9 a to 9 d is hooked on the rods 4 a to 4 d standing on the upper surface of the fixed base 4, and the other end is hooked on the rods 6 a to 6 d standing on the lower surface of the sliding base 6. .

The rods 4a to 4d are symmetrically arranged near the centers of the fixed base 4 and the sliding base 6, and the other rods 6a to 6d are arranged near the corners of the fixed base 4 and the sliding base 6. Has been done. When the center of the fixed base 4 and the center of the sliding base 6 coincide with each other, the rods 4a-4
The relative positional intervals between d and the rods 6a to 6d are the same.

Therefore, the coil springs 9a to 9d mounted between the rods 4a to 4d and the rods 6a to 6d, respectively.
Holds the relative positions of the fixed base 4 and the sliding base 6 in a state where the spring forces acting in the diagonal directions are balanced when there is no vibration. Therefore, when the fixed base 4 and the sliding base 6 are displaced relative to each other due to an earthquake, the coil springs 9a to 9d are compressed or pulled in the sliding direction of the sliding base 6, and the sliding base 6 is released. An urging force for returning to the position before the shaking action acts on the sliding base 6.

Further, as the sliding base 6 slides with respect to the fixed base 4, the coil springs 9a to 9d become longer in compression or tension, so that as the sliding distance of the sliding base 6 becomes larger, The urging force of the coil springs 9a to 9d increases and the sliding resistance of the sliding base 6 increases, so that the sliding operation is decelerated. Then, the sliding base 6 has coil springs 9a to 9d.
It returns to the position before the seismic isolation operation, in which the urging forces of are balanced.

FIG. 3 is an enlarged side view showing the sliding mechanisms 7a to 7d. The sliding mechanisms 7a to 7d are generally fitted with a seismic isolation leg (sliding leg) 10 provided on the lower surface of the sliding base 6 and a sliding plate 5 which is slidably fitted to the seismic isolation leg 10 in the vertical direction. It includes a sliding member 11 that slides, a coil spring 12 that presses the sliding member 11 downward, and a spring force adjusting mechanism 13 that adjusts the spring force of the coil spring 12.

The seismic isolation leg 10 is screwed to the sliding base 6, a cylindrical ball bearing portion 10b connected to the lower end of the male screw portion 10a, and a ball bearing portion 10b. And the ball 10c supported by. Since the ball 10c is supported with a part thereof protruding from the lower surface of the ball bearing portion 10b, a part of the spherical surface is in contact with the upper surface of the slide plate 5, and the slide plate 5 rolls with extremely low friction. Can move.

As the ball 10c rolls on the surface of the sliding plate 5 in this way, the sliding base 6 can slide smoothly, and the floor 2 can be placed on the object 3 placed on the sliding base 6. To prevent vibrations from being propagated. Further, since the balls 10c are in point contact with the sliding plate 5, the sliding resistance with the sliding plate 5 is reduced, and the balls 10c slide on the surface of the sliding plate 5 when rolling friction is large and rolling is impossible. .

Further, the sliding member 11 is formed in a cup shape, and the fitting portion 11a into which the ball bearing portion 10b is fitted so as to be slidable in the vertical direction and the fitting portion 11a projecting outward from the lower end of the fitting portion 11a. And a friction member 11c held on the lower surface of the collar portion 11b, and a stopper portion 11d protruding inward from the upper end of the fitting portion 11a.

The outer circumference of the ball bearing portion 10b fitted in the fitting portion 11a of the sliding member 11 has a sufficiently large vertical dimension so that when the ball 10c rolls or slides on the sliding plate 5. Even if a horizontal force acts on the seismic isolation leg 10, the ball bearing portion 10b does not tilt in the fitting portion 11a.

The lower end of the coil spring 12 is in contact with the upper surface of the collar portion 11b, and the sliding member 11 is pressed against the sliding plate 5 by the spring force of the coil spring 12. Therefore, the friction member 11c of the sliding member 11 is
The frictional force with respect to the sliding plate 5 is determined by the spring force of. Therefore, when the spring force of the coil spring 12 is adjusted by the spring force adjusting mechanism 13, the frictional force of the sliding member 11 is adjusted to a desired value.

The seismic isolation leg 10 is provided on the inner periphery of the stopper portion 11d.
An insertion hole 11e for inserting the male screw portion 10a is provided, and the sliding member 11 must be fitted to the seismic isolation leg 10 before the seismic isolation leg 10 is attached to the sliding base 6. . In addition, when the installation location of the seismic isolation device 1 is moved after the seismic isolation device 1 is installed, the sliding base 6 is lifted upward. At this time, when the sliding base 6 is lifted upward by a jack or the like, the sliding member 11 pressed by the coil spring 12 moves downward, but the stopper portion 11d abuts the upper surface of the ball bearing portion 10b of the seismic isolation leg 10 and slides. The moving member 11 is prevented from falling off.

Further, the male thread portion 10a of the seismic isolation leg 10 is
A lock nut 14 that abuts the lower surface of the sliding base 6, a disk-shaped spring receiver 15 of the spring force adjusting mechanism 13, and a lock nut 1 that locks the spring receiver 15 at a predetermined adjustment position.
6 and are screwed together. The spring bearing 15 has a seismic isolation leg 1 in the center.
A screw hole 15a into which the male screw portion 10a of 0 is screwed is provided, and an annular recess 15b into which the upper end of the coil spring 12 is fitted is provided on the lower surface of the spring receiver 15.

The lock nut 16 functions as a restricting member for restricting the mounting position of the spring receiver 15, and also as a locking member for locking the spring receiver 15 so as not to rotate freely. Therefore, the spring force adjusting mechanism 13
Is the spring receiver 15, the lock nut 16, and the male screw portion 1.
And 0a.

In the spring force adjusting mechanism 13 having the above structure, the height position of the spring receiver 15 can be changed by loosening the lock nut 16 and rotating the spring receiver 15 screwed onto the male screw portion 10a. That is, by changing the separation distance L between the spring receiver 15 and the flange portion 11b of the sliding member 11, it is possible to adjust the spring force of the coil spring 12 by changing the vertical total length of the coil spring 12 to an arbitrary length. .

Here, the frictional force of the friction member 11c provided at the lower end of the sliding member 11 will be described. When the frictional force F is expressed by a mathematical expression, it can be expressed as the following expression. F = μN (1) (μ: friction coefficient determined by the material of the friction member, N: vertical drag) In the above formula (1), when the vertical drag N is the spring force of the coil spring 12, the amount of deflection of the coil spring 12 is The frictional force of the friction member 11c can be changed by changing. The relationship between the spring force of the coil spring 12 and the frictional force F can be expressed by the following equation (2).

F = μkx (2) (k: Spring constant, x: Deflection amount of coil spring 12) Therefore, the friction force F of the friction member 11c can be adjusted by changing the deflection amount of the coil spring 12. it can.

For example, when the weight of the object 3 placed on the sliding base 6 is relatively small, the frictional force becomes relatively large with respect to the weight of the object 3 to be placed. For this reason,
The amount of relative displacement between the sliding plate 5 and the sliding base 6 with respect to a predetermined vibration is reduced. Therefore, in the seismic isolation device 1, the vibration that must be isolated is transmitted to the sliding base 6 more than expected, and as a result, the isolation operation for the predetermined vibration that must be isolated cannot be performed.

In this case, as shown in FIG.
And the spring force of the coil spring 12 is weakened. As a result, the amount of deflection of the coil spring 12 is reduced, and the frictional force F of the friction member 11c can be set small. Therefore, when the sliding base 6 slides with respect to the fixed base 4, the frictional force F generated by the friction member 11c of the sliding member 11 sliding on the sliding plate 5 is alleviated.

Therefore, even if the weight of the mounted object 3 is comparatively light, the relative speed between the fixed base 4 and the sliding base 6 with respect to a predetermined vibration is limited to a predetermined sliding speed. As a result, the sliding base 6 can be stably slid even though the object 3 is light in weight.

FIG. 4 is a vertical sectional view showing the spring force adjusting operation of the coil spring 12 by the spring force adjusting mechanism 13. When the weight of the mounted object 3 placed on the sliding base 6 is relatively heavy, the frictional force becomes relatively small with respect to the weight of the mounted object 3. Therefore, the sliding plate 5 against a predetermined vibration
The relative displacement between the sliding base 6 and
May come off the sliding plate 5. Therefore, the seismic isolation apparatus 1 may not be able to perform seismic isolation operation for a predetermined vibration that must be seismically isolated.

In this case, as shown in FIG.
The height of the coil spring 12 is lowered to increase the spring force of the coil spring 12. As a result, the amount of deflection of the coil spring 12 increases, and the frictional force F of the friction member 11c can be set to a large value. Therefore, when the sliding base 6 slides with respect to the fixed base 4, the frictional force F generated by the friction member 11c of the sliding member 11 sliding on the sliding plate 5 is increased.

Therefore, even when the object 3 to be placed is relatively heavy, the relative speed between the fixed base 4 and the sliding base 6 against a predetermined vibration is kept at a predetermined sliding speed. Since the frictional force F of the frictional member 11c can be adjusted in this way, the frictional force F of the frictional member 11c according to the weight of the object 3 placed on the seismic isolation apparatus 1 having the above-described configuration can be adjusted. It is possible to set the sliding resistance, and as a result, the sliding resistance of the sliding base 6 with respect to the fixed base 4 can be set to a constant value regardless of the weight of the mounted object 3. Therefore, the weight of the mounted object 3 is too heavy and even if the vibration is small, the sliding base 6 slides to make the mounted object 3 unstable, or the weight of the mounted object 3 is too light to propagate the vibration due to the earthquake. When this is done, it is possible to eliminate the inconvenience that the sliding base 6 does not slide smoothly and a sufficient seismic isolation effect cannot be obtained.

Further, in the spring force adjusting mechanism 13, the lock nut 16 is loosened and the spring receiver 15 which is screwed into the male screw portion 10a is rotated to adjust the spring force of the coil spring 12 and the friction force F of the friction member 11c. The friction member 1 can be easily changed even after the seismic isolation device 1 is installed.
The frictional force F of 1c can be adjusted.

FIG. 5 is a vertical sectional view of a second embodiment of the present invention. The spring receiver 15 is provided with an insertion hole 15c into which the male screw portion 10a of the seismic isolation leg 10 is inserted. Insertion hole 15
Since the inner diameter of c is sufficiently larger than the outer diameter of the male screw portion 10a, the spring receiver 15 is slidably fitted in the male screw portion 10a in the axial direction (vertical direction).

The lock nut 16 functions as a stopper for regulating the height position of the spring receiver 15 and also as a position adjusting member for adjusting the height position of the spring receiver 15. With this configuration, the height position of the spring receiver 15 can be easily adjusted simply by rotating the lock nut 16 using a tool such as a spanner.

Therefore, since the spring force of the coil spring 12 can be adjusted by rotating the lock nut 16 to change the friction force F of the friction member 11c, the friction force F of the friction member 11c can be easily adjusted. be able to. FIG. 6 is a vertical sectional view of a third embodiment of the present invention.

The sliding member 11 is not provided with the stopper portion 11d at the upper end, and the fitting portion 11a into which the ball bearing portion 10b fits is penetrated upward. Therefore, after the seismic isolation leg 10 is attached to the sliding base 6, the coil spring 12 and the sliding member 11 can be attached.

Therefore, even when the coil spring 12 or the friction member 11c is replaced after the seismic isolation device 1 is installed, the sliding member 11 can be pulled out and pulled out, so that the sliding base 6 is lifted and slid upward. By removing the member 11 from the ball bearing portion 10b, the coil spring 12 or the friction member 11 is removed.
The replacement work of c can be easily performed.

FIG. 7 is a longitudinal sectional view of the fourth embodiment of the present invention, and FIG. 8 is a perspective view of the fourth embodiment. The male thread 10a of the seismic isolation leg 10 is provided with a groove 10d extending in the axial direction. A thin plate-shaped scale 17 is attached to the wall surface of the groove 10d. When adjusting the spring force by the spring force adjusting mechanism 13 as described above, the amount of change in the height position of the spring receiver 15 screwed onto the male screw portion 10a can be read from the scale 17. Therefore, since the amount of change in the vertical direction of the spring receiver 15 can be seen at a glance from the scale 17, the coil spring 12 relative to the adjustment position of the spring receiver 15 based on the scale 17.
The amount of change in the spring force can be predicted, and the frictional force F of the friction member 11c can be set to an arbitrary value.

On the surface of the scale 17, the object 3 to be placed is placed.
The color is gradually changed according to the weight of. For example, the scale 17 corresponding to the weight of the placed object 3 is 20 to 30 kg.
The adjustment range is colored "white", and the weight of the object 3 corresponds to 30 to 40 kg. The adjustment range of the scale 17 is colored "yellow" and the weight of the object 3 corresponds to 40 to 50 kg. The adjustment range of the scale 17 is colored "blue",
Scale 1 on which the weight of the object 3 is 50 to 70 kg
The adjustment range of 7 is colored “green”.

Therefore, depending on the weight of the object 3 to be placed, the spring receiver 15 is placed so that the spring receiver 15 falls within each color-coded range.
The spring force of the coil spring 12 can be relatively easily adjusted to a magnitude corresponding to the weight of the mounted object 3 by adjusting the height position of the friction member 11c, and the friction force F of the friction member 11c can be adjusted to an arbitrary magnitude. Can be set to.

FIG. 9 is a perspective view of the fifth embodiment of the present invention. A marker 18 is provided on the peripheral edge of the spring receiver 15. The marker 18 includes a triangular mark 18 a provided on the upper surface 15 d of the spring receiver 15 and an outer circumference 15 e of the spring receiver 15.
And a marker line 18b in the vertical direction provided on the.
The marker 18 is colored red for easy viewing.

A scale 19 is provided on the peripheral edge of the upper surface 11f of the sliding member 11. The scale 19 is for reading the position of the marker 18 of the spring receiver 15, and the displacement amount of the marker 18 can be read from the scale 19 when the spring receiver 15 is rotated.

Therefore, as described above, the spring force adjusting mechanism 13
Thus, when adjusting the spring force, it is possible to read from the scale 19 the amount of change in the rotational direction of the spring receiver 15 that is screwed into the male screw portion 10a. Therefore, since the amount of change in the rotational direction of the spring receiver 15 can be seen at a glance from the scale 19, it is possible to predict the amount of change in the spring force of the coil spring 12 with respect to the adjustment position of the spring receiver 15 based on the scale 19. The frictional force F of the friction member 11c can be set to an arbitrary magnitude.

FIG. 10 is a vertical sectional view of a sixth embodiment of the present invention. A rubber cover 20 is attached to the flange portion 11b of the sliding member 11. This cover 20 has a collar 1
An annular mounting portion 20a that is in close contact with the upper surface of 1b and a skirt portion 20b that extends downward from the outer periphery of the mounting portion 20a and that is in close contact with the outer periphery of the collar portion 11b. Also, the skirt 2
The tip 20c of 0b is extended so as to slidably contact the surface of the sliding plate 5 in a bent state.

Since the cover 20 is made of rubber having elasticity, when the sliding base 6 is displaced relative to the fixed base 4, the tip 20c of the skirt portion 20b is in a state where there is no resistance on the surface of the sliding plate 5. It can be slid on. And
The tip 20c of the skirt portion 20b has a flange portion 1 of the sliding member 11.
It is formed so as to cover the outside of the friction member 11c provided on 1b.

Therefore, foreign matter such as dust is prevented from adhering to the friction member 11c. When the sliding base 6 slides relative to the fixed base 4, the skirt portion 2
The tip 20c of 0b cleans the surface of the slide plate 5 and
Remove foreign matter such as dust adhering to. Therefore, the friction member 11c can always slide on the slide plate 5 in the absence of foreign matter such as dust, and the frictional force is prevented from varying due to dust and the like.

Therefore, the friction member 11c of the sliding member 11 can always obtain a stable friction force, and even after the seismic isolation device 1 is installed, the friction force F of the friction member 11c is changed in the same manner as in the initial state. be able to. FIG. 11 shows the seventh aspect of the present invention.
FIG. 12 is a front view of the embodiment, and FIG. 12 is a vertical sectional view of the seventh embodiment.

The vibration damping device 21 is a passive type vibration damping device which is installed on the rooftop 22 of the building and performs a vibration damping operation when the building vibrates due to an earthquake. The vibration damping device 21 includes an additional mass (placement) 23 having a predetermined weight according to the size of the building,
It is composed of four laminated rubbers 24 supporting the additional mass 23 and a sliding mechanism 25 provided at the center of the additional mass 23.

The laminated rubber 24 has a structure in which a plurality of iron plates and rubber plates are alternately stacked and is capable of bending in the horizontal direction. Therefore, when the building vibrates in the horizontal direction due to an earthquake, similar vibration propagates to the additional mass 23 via the laminated rubber 24 of the vibration damping device 21, and the laminated rubber 24 allows the damping operation of the additional mass 23. Elastically deforms horizontally. The natural frequency of the laminated rubber 24 at this time is set to match the natural frequency of the building.

The sliding mechanism 25 generally includes a friction leg (sliding leg) 26 provided on the lower surface of the sliding base 6, and a sliding member 27 into which the friction leg 26 is vertically movably fitted. The friction member 28 provided on the lower surface of the sliding member 27 and the sliding member 2
7, a coil spring 30 for pressing the bottom plate 29 of the sliding member 27 downward, a spring force adjusting mechanism 31 for adjusting the spring force of the coil spring 30, and a sliding plate 32 on which the friction member 28 slides. . The friction leg 26 includes a male screw portion 26a screwed into the screw hole 23a of the additional mass 23 and a cylindrical sliding portion 26b coupled to the lower end of the male screw portion 26a.

The friction member 28 is integrally fixed in a recess 29a provided on the lower surface of the bottom plate 29 in a fitted state. Therefore, when the additional mass 23 swings in the horizontal direction to perform the vibration damping operation, the friction member 28 slides on the surface of the sliding plate 32 to impart sliding resistance to the additional mass 23.

Further, the sliding member 27 is formed in a cylindrical shape, and the fitting portion 27a into which the sliding portion 26b is fitted so as to be slidable in the vertical direction, and the fitting member 27a protruding outward from the lower end of the fitting portion 27a. And a stopper portion 27c protruding inward from the upper end of the fitting portion 27a. In addition, the sliding member 27
Since the outer circumference of the sliding portion 26b fitted to the fitting portion 27a is sufficiently large in the vertical direction, it is guided by the fitting portion 27a and a horizontal force acts on the friction leg 26. Also, the sliding portion 26b is prevented from tilting in the fitting portion 27a.

Further, a bottom plate 29 is fixed to the lower surface of the flange portion 27b by a mounting bolt 34 to close the lower opening of the fitting portion 27a. A coil spring 30 is interposed between the sliding portion 26b inserted in the fitting portion 27a and the bottom plate 29. An insertion hole 27e for inserting the external thread portion 26a of the friction leg 26 is provided on the inner periphery of the stopper portion 27c, and the friction leg 26 is attached to the sliding base 6a.
It is necessary to fit the sliding member 27 to the friction leg 26 before attaching to the friction leg 26. Further, when the additional mass 23 is moved after being installed, even if the additional mass 23 is lifted up by a jack or the like, the sliding member 27 moves downward, but the stopper portion 27c contacts the upper surface of the sliding portion 26b of the friction leg 26. The sliding member 27 is prevented from coming off due to the contact.

Further, the external thread portion 26a of the friction leg 26 is
A lock nut 35 that contacts the lower surface of the additional mass 23 is screwed. The lock nut 35 regulates the height position of the sliding member 27 and locks the sliding member 27 so as not to rotate freely. Therefore, the spring force adjusting mechanism 31
It is composed of the lock nut 35 and the male screw portion 26a.

In the spring force adjusting mechanism 31 having the above structure, the height position of the sliding portion 26b can be changed by turning the lock nut 35. That is, the sliding portion 2
By changing the separation distance L between 6b and the bottom plate 29, the overall length of the coil spring 30 in the vertical direction can be changed to an arbitrary length, and the spring force of the coil spring 30 can be adjusted.

Therefore, the friction member 28 provided on the lower surface of the bottom plate 29 is slidable by the spring force of the coil spring 30.
The frictional force against is determined. Therefore, the spring force adjustment mechanism 31
When the spring force of the coil spring 30 is adjusted by, the friction force of the friction member 28 is adjusted to a desired value.

In the vibration damping device 21, for example, when it is desired to change the frictional force of the friction member 28, when adjusting the damping force of the vibration damping device 21, the spring force adjusting mechanism 31 adjusts the spring force of the coil spring 30. Then, the frictional force of the friction member 28 is changed. For example, when it is desired to reduce the damping force of the vibration damping device 21 itself, the height of the sliding portion 26b is increased to weaken the spring force of the coil spring 30. As a result, the amount of deflection of the coil spring 30 is reduced, and the friction force F of the friction member 28 is reduced.
Can be set small. Therefore, when the additional mass 23 is horizontally displaced relative to the rooftop 22 of the building, the frictional force F generated by the friction member 28 sliding on the sliding plate 32 is mitigated.

When it is desired to increase the damping force of the vibration damping device 21 itself, the height of the sliding portion 26b is lowered to increase the spring force of the coil spring 30. As a result, the amount of deflection of the coil spring 30 increases, and the frictional force F of the friction member 28 can be set to a large value. Therefore, when the additional mass 23 is horizontally displaced relative to the rooftop 22 of the building, the frictional force F generated by the friction member 28 sliding on the sliding plate 32 is increased.

If it is desired to change the damping force of the vibration damping device 21 itself, the frictional force F of the friction member 28 can be easily adjusted. Further, it is not necessary to design the sliding mechanism 25 in accordance with the size of the additional mass 23 and the vibration to be damped, that is, the sliding mechanism 25 itself can be easily mass-produced, and the manufacturing cost of the sliding mechanism 25 can be reduced. Vibration control device 2 can be made inexpensive, and after the vibration control device 21 is installed in the building, the vibration control device 2
The damping force of 1 can be adjusted.

FIG. 13 is a vertical sectional view of the eighth embodiment of the present invention. In the sliding mechanism 25 of the vibration damping device 21, the sliding portion 26b of the friction leg 26 has a flange portion 26b ₁ fitted to the fitting portion 27a of the sliding member 27 and a guide portion 27f of the sliding member 27.
Has a cylindrical portion 26b ₂ which is fitted to The collar portion 26b ₁ is
The coil spring 30 functions as a spring receiver that contacts the coil spring 30 and also functions as a spring stopper that contacts the guide portion 27f.

Further, the column portion 26b ₂ and the guide portion 27f
Has a sufficiently large vertical dimension, the columnar portion 26b ₂ is guided by the guide portion 27f, and even if a horizontal force acts on the friction leg 26, the columnar portion 26b ₂ moves within the guide portion 27f. Tilt is prevented.

[0071]

As described above, according to the first aspect of the present invention, since the frictional force adjusting means for adjusting the frictional force of the sliding portion with respect to the fixed surface is provided, the sliding portion and the fixed surface can be adjusted according to the weight of the object. The frictional force between and can be adjusted to an arbitrary magnitude, and the frictional force can be easily adjusted even if the object to be placed is replaced and the weight is changed after installation.

Further, according to the second aspect, the friction force of the friction member sliding on the fixed surface can be adjusted by adjusting the spring force of the spring member. It can be adjusted to an arbitrary size according to the weight of the placed object, and the frictional force adjustment time can be shortened.

According to the third aspect, in the seismic isolation device, the friction force of the friction member sliding on the fixed surface can be adjusted by adjusting the spring force of the spring member.
The frictional force can be adjusted to an arbitrary size according to the weight of the object to be placed by a relatively simple operation, and the frictional force adjustment time can be shortened.

According to the present invention, in the vibration damping device, since the frictional force adjusting means for adjusting the frictional force of the sliding portion is provided in the sliding portion, the frictional force can be adjusted to an arbitrary magnitude. The damping force of the vibration damping device itself can be adjusted.

[Brief description of drawings]

FIG. 1 is a front view of a seismic isolation device to which a first embodiment of the present invention is applied.

FIG. 2 is a plan view of the seismic isolation device.

FIG. 3 is an enlarged side view showing a sliding mechanism.

FIG. 4 is a vertical sectional view showing a spring force adjusting operation by a spring force adjusting mechanism.

FIG. 5 is a vertical sectional view of a second embodiment of the present invention.

FIG. 6 is a vertical sectional view of a third embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a fourth embodiment of the present invention.

FIG. 8 is a perspective view of a fourth embodiment.

FIG. 9 is a perspective view of a fifth embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a sixth embodiment of the present invention.

FIG. 11 is a front view of the seventh embodiment of the present invention.

FIG. 12 is a vertical sectional view of a seventh embodiment.

FIG. 13 is a vertical sectional view of an eighth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 3 Mounted object 4 Fixed base 5 Sliding plate 6 Sliding base 7a-7d Sliding mechanism 8 Energizing mechanism 9a-9d Coil spring 10 Seismic isolation leg 11 Sliding member 11c Friction member 12 Coil spring 13 Spring force adjusting mechanism 14, 16 Lock nut 15 Spring receiver 17, 19 Scale 18 Marker 20 Cover 21 Vibration suppressor 23 Additional mass 24 Laminated rubber 25 Sliding mechanism 26 Friction leg 27 Sliding member 28 Friction member 31 Spring force adjusting mechanism

Claims (4)

[Claims] 1. A sliding mechanism having a sliding portion slidably provided with respect to a fixed surface, wherein the sliding portion and the fixed surface are displaced relative to each other according to the magnitude of input vibration. A sliding mechanism, wherein frictional force adjusting means for adjusting a frictional force of the sliding portion with respect to the fixed surface is provided in the sliding portion. 2. The sliding mechanism according to claim 1, wherein the frictional force adjusting means is provided on a sliding leg that slides on the fixed surface, and is vertically displaceable on the sliding leg. A sliding mechanism comprising: a friction member that slides on the fixed surface; a spring member that presses the friction member against the fixed surface; and a spring force adjustment mechanism that adjusts the spring force of the spring member. . 3. A seismic isolation device having the sliding mechanism according to claim 1 or 2. 4. A vibration damping device for supporting an additional mass having a predetermined weight by means of laminated rubber, wherein a frictional force for adjusting the frictional force of the sliding part is provided by providing the additional mass with a sliding part that slides on the fixed surface. A vibration damping device characterized in that force adjusting means is provided on the sliding portion.