JPH1113830A - Trigger mechanism for base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly lock a base isolation device, by a stopper member from being operated by external force except an earthquake at normal time, eliminate the stopper member by base isolation action when an earthquake is generated, so that the base isolation device can be switched to an unlocked condition. SOLUTION: In a base isolation device 1 arranging a base seat 3 with a support surface between support base 2 and a base isolation base 4 as a recessed surface 6 and a ball unit 7 rollingly moving on the recessed surface 6 of the base seat 3 to be opposed to each other and supporting the base isolation base 4 able to move in a horizontal direction relating to the support base 2 through these base seat 3 and ball unit 7, a stopper member 10 energized in a horizontal direction by a spring 9 is integrally held between the support base 2 and the base isolation base 4 to be interposed, the base isolation base 4 is directly mounted on the support base 2 by the stopper member 10 to prevent the lateral shaking of the base isolation base 4 by external force except an earthquake. Relating to a large vibration such as an earthquake of generation time, by a rise of the base isolation base 4 according to relative displacement of the base seat 3 and the ball unit 7, integral holding force of the support base 2 and the base isolation base 4 by the stopper member 10 is released, by the spring 9, the stopper member 10 is eliminated to an inoperative position without butt to the base isolation base 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention prevents the seismic isolation device from operating due to vibration other than an earthquake, external force, strong wind, etc., and releases the operation of the seismic isolation device when an earthquake occurs. The present invention relates to a trigger mechanism of a seismic isolation device that enables seismic isolation, and more particularly to a trigger mechanism of a seismic isolation device suitable for use on a display stand of a computer or a valuable arts and crafts that extremely dislikes vibration.

[0002]

2. Description of the Related Art In general, a seismic isolated object supported via a seismic isolation device is used to reduce the shaking at the time of the occurrence of an earthquake and to prevent the shaking of the earthquake from being transmitted to the seismic isolated object as much as possible. To support seismic isolation.

For this reason, when the seismic isolation is a relatively small structure such as a general house, or a computer or a valuable arts and crafts which is extremely disliked by the vibration, These seismic isolation members easily swing due to vibration other than the earthquake, external force, strong wind, and the like.

Therefore, in such a seismic isolation device used for such a small seismic isolated object, the seismic isolation table on which the seismic isolated object is mounted is normally kept in a locked state, and vibrations other than an earthquake, external force, strong wind, etc. In addition to suppressing the shaking of the seismic isolation object due to the earthquake, in the event of an earthquake, the seismic isolation table is unlocked to enable the seismic isolation effect by switching to the unlocked state, so that the seismic isolation device is absorbed by the seismic isolation device. It is desirable to do it.

[0005] From such a viewpoint, for example, as disclosed in Japanese Patent Application Publication No. 183060/1990, a seismic isolation operation control mechanism is interposed between a support base and a seismic isolation base along with a seismic isolation device. A seismic isolation device has been proposed.

That is, in the above proposal, a cylindrical stopper member is laid on a table so as to be rolled freely by falling down sideways.
Alternatively, a stopper member (restriction member) which is erected on the support table so as to be able to fall over is used, and these stopper members are interposed between the periphery of the seismic isolation table and the locking wall on the support table side, and A lock / unlock switching mechanism is configured.

In this manner, in normal times, the seismic isolation table is prevented from shaking by the stopper member on the support base side through the stopper member, and the seismic isolation table is kept in a locked state to prevent vibration other than earthquake, external force, strong wind and the like. To reduce the vibration of seismic isolation.

In addition, against a large shaking such as when an earthquake occurs, the stopper member rolls on the table and falls, or falls on the support table and falls off the side surface of the seismic isolation table. The seismic isolation device is unlocked to enable the operation of the seismic isolation device, and the seismic isolation device absorbs and suppresses the vibration of the seismic isolation device.

[0009]

However, even so, in the case of this proposal, as described above, it rolls due to the occurrence of an earthquake and falls from the table or falls on the support table. The seismic isolation table is locked and unlocked in anticipation of the function of the stopper member.

[0010] For this reason, the stopper member falls from the stand or falls on the support base not only depends on the magnitude of the earthquake and the vibration direction, but also when the vibration direction is reversed before the stopper member falls or falls, for example. It returns to the locked state.

From this, it is not known when the stopper member drops or falls and the lock of the seismic isolation table is released, and therefore, if the lock of the seismic isolation table is always reliably released with the occurrence of the earthquake. Is not always limited.

Furthermore, if the stopper member is sandwiched between the locking wall on the support base side and the side wall of the seismic isolation table in normal times, the stopper member will not fall or fall due to the earthquake vibration. Therefore, the stopper member must be provided with a certain gap between the locking wall on the support base side and the side wall of the seismic isolation base.

As a result, even in a normal state, when subjected to vibration other than earthquake, external force, strong wind, etc., not only does the seismic isolation table sway within these gaps, causing the seismic isolation object to sway, but also The problem is that the shaking table repeatedly hits the stopper member and impacts the seismic isolated object, damaging the computer and the arts and crafts for display, or in the case of a general house, causing anxiety to residents. It also has

Accordingly, an object of the present invention is to lock the operation of the seismic isolation device by a stopper member at normal times due to vibrations other than an earthquake, external force, strong wind, etc., and to lock the stopper member at the time of an earthquake. An object of the present invention is to provide a trigger mechanism for a seismic isolation device that can be unlocked by removing the seismic isolation device from a state where the seismic isolation table does not collide with the seismic isolation operation.

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pedestal having a concave support surface between a support table and a seismic isolation table, and a ball moving while rolling on the concave surface of the pedestal. Are placed facing each other, and the seismic isolation table is supported via these pedestals and balls so as to be movable in the horizontal direction with respect to the support base. A stopper member urged in the horizontal direction is integrally held and interposed, and the seismic isolation table is placed directly on the support table with the stopper member to prevent the seismic isolation table from rolling due to external force other than earthquake. In addition to preventing the vibration, such as when an earthquake occurs, the seismic isolation base rises due to the relative displacement of the base and the ball, releasing the integrated holding power of the support base and the isolation base by the stopper member. , Spring removes stopper member to inoperative position where it does not collide with seismic isolation table It is achieved by Rukoto.

In other words, with the above-described configuration, in normal times, the seismic isolation table is moved through the stopper member by the holding force of the stopper member interposed between the support table and the seismic isolation table. It is directly held integrally on top.

[0017] In this way, the sway of the seismic isolation table caused by vibration other than the earthquake, external force, strong wind, and the like is locked and suppressed by the respective holding forces between the support table and the stopper member for the seismic isolation table.

On the other hand, when an earthquake occurs,
As the seismic isolator rises due to the relative displacement of the base and the ball in the seismic isolator, the holding force between the support base and the stopper member and the holding force between the seismic isolator table and the stopper member are both released.

As a result, the stopper member is removed to an inoperative position where it does not collide with the seismic isolation table due to the spring force of the spring. Thereafter, the seismic isolation device absorbs the vibration of the earthquake while performing the normal seismic isolation operation. To prevent the seismic isolation table from rolling.

Preferably, in the above, with the removal of the stopper member to the inoperative position by the spring force of the spring, a projection is provided on the support base and the stopper member is applied, and the stopper member is used by the projection. I will try to get rid of it in an inoperative state that does not collide with the seismic isolation table.

Thus, the interference between the stopper member and the seismic isolation table during the seismic isolation operation is more reliably prevented, and the locking and unlocking of the seismic isolation table by the stopper member can be performed efficiently and stably. Become.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 1, a seismic isolation device 1 includes a plurality of pedestals 3 (only some of which are arranged vertically and horizontally on a support base 2), a house and a computer facing the pedestals 3. Alternatively, it has the same number of supporting legs 5 (only a part is shown) installed on the lower surface of the seismic isolation table 4 on which exhibits such as arts and crafts are placed.

The pedestal 3 arranged on the support base 2 has a conical concave surface 6 having an upper surface, which is a receiving surface, having an upward slope toward the periphery.
As a result, so that the center part is the lowest.

On the other hand, large diameter steel balls 7 are provided at the lower ends of the support legs 6 installed on the lower surface of the base isolation table 4, respectively.
Are supported by a large number of small-diameter steel balls (not shown) in the support legs 5 so as to roll freely, and the steel balls 7 are arranged to protrude from the lower surfaces of the support legs 5.

The steel ball 7 is placed on the concave surface 6 of the pedestal 3 of the support base 2 and is normally positioned at the center of the concave surface 6 by gravity acting on the seismic isolation table 4 side. Seismic isolation table 4 while rolling
Can be moved in the lateral direction relative to the support base 2 so as to be relatively displaceable in all directions.

On the other hand, the seismic isolation table 4 has side wall pieces 8 hanging downward.
The pedestal 3 on the side of the support 2 and the base 4 above
A stopper member 10 urged inward by a spring 9 is interposed alongside the steel ball 7 on the side.

In this case, a rising portion 11 is formed at the outer end of the upper surface of the stopper member 10, and the rising portion 11 is released by the spring force of the spring 9 in a normal state (the state shown in FIG. 1A). The seismic isolation table 4 is placed directly on the support table 2 via the stopper member 10 against the outer surface of the side wall piece 8 of the vibration table 4.

In addition to the above, the stopper member 10
The height of the rising portion 11 of the stopper member 10 is determined so that the angle α connecting the inner edge of the rising portion 11 and the inner edge of the rising portion 11 is smaller than the angle β of the concave surface 6 of the pedestal 3.

Next, the operation of the seismic isolation device 1 of FIG. 1 configured as described above will be described.

In a normal state, as shown in FIG. 1A, the rising portion 11 of the stopper member 10 is engaged with the side wall piece 8 of the seismic isolation table 4 by the spring force of the spring 9 and is integrally held. Then, the steel ball 7 is slightly lifted and slightly positioned at the center of the concave surface 6 of the pedestal 3. In this way, the seismic isolation table 4 is directly placed on the support table 2 through the stopper members 10.

Thus, the base isolation table 4 and the stopper member 10
In between, while the holding force by the rising portion 11 acts,
A holding force as a frictional force due to the load on the seismic isolation table 4 acts on the contact surface between the support table 2 and the stopper member 10, and the holding force acts in the horizontal direction of the support table 2 and the seismic isolation table 4. And rocks while suppressing the relative displacement of the base isolation table 4 to prevent the seismic isolation table 4 from rolling due to vibration other than the earthquake, external force, strong wind, and the like.

On the other hand, when a large vibration that overcomes the holding force between the support table 2 and the stopper member 10 due to the occurrence of an earthquake is applied to the support table 2 side, the support table 2 and the stopper member 10
Is caused in the contact surface between the base 2 and the base 2 and the seismic isolation table 4, causing a relative displacement in the horizontal direction.

With the relative displacement between the support table 2 and the seismic isolation table 4, the concave surface 6 of the pedestal 3 on the support table 2 side is pressed against the steel ball 8 provided on the support leg 5 on the seismic isolation table 4 side. The seismic isolation table 4 is lifted upward along the inclination of the concave surface 6 while rolling the steel ball 8.

However, until the side wall piece 8 of the seismic isolation table 4 rises beyond the rising part 11 of the stopper member 10, the rising part 11 is pressed against the side wall piece 8 by the spring force of the spring 9, as shown in FIG. In this state, the stopper member 10 is held in a locked state while maintaining the holding force of the stopper member 10 on the seismic isolation table 4.

Nevertheless, as shown in FIG. 1B, a gap 12 is formed between the side wall piece 8 and the stopper member 10 due to the rise of the seismic isolation table 4. The load applied to the contact surface between the support base 2 and the stopper member 10 on the seismic isolation table 4 side is reduced to the concave surface 6 of the base 3.
To the contact portion between the steel ball 7 and the steel ball 7.

For this purpose, the support table 2 and the stopper member 10
The holding force is extremely reduced due to a decrease in the frictional force between the support base 2 and the support table 2 gently slides on the contact surface with the stopper member 10 while lifting the seismic isolation table 4 upward due to the inclination of the concave surface 6 of the base 3. Will move.

Subsequently, when the side wall piece 8 of the seismic isolation table 4 exceeds the rising part 11 of the stopper member 10, the locking of the rising part 11 of the stopper member 10 by the locking piece 8 of the seismic isolation table 4 is released. As shown in FIG. 1C, the stopper member 10 is moved by the spring force of the spring 9 so as to be lower than the locus x of the lower end of the side wall piece 8 due to the relative displacement between the support base 2 and the seismic isolation base 4. It is removed to the inoperative position which does not conflict with

In the above, as shown in FIG.
A projection 13 is provided on the upper surface of the support base 2, and a spring 9 is provided by using a stopper member 10 a having a slit 14.
Is rotatably mounted, and the stopper member 10a is
In this way, it is possible to efficiently and stably exclude the seismic isolation table 4 from the inoperative position while keeping the state in which it does not collide with the seismic isolation table 4.

Thus, the seismic isolation device 1 unlocks the seismic isolation table 4 in response to the occurrence of the earthquake, and
To the inoperative position to prevent the vibration of the earthquake from being transmitted directly to the base isolation table 4 while performing the original seismic isolation function.

When the earthquake stops, the steel ball 7 automatically returns to the center of the concave surface 6 of the pedestal 3 and stands still by the load on the seismic isolation base 4.

Here, the stopper member 10 is promptly reset to the original state, the seismic isolation table 4 is locked, and the next seismic isolation table 4 is prevented from rolling due to vibration other than the earthquake, external force, strong wind, and the like. Prepare for an earthquake.

Also, in the embodiment of FIG. 1 described so far, the case has been described where the stopper members 10 and 10a having the rising portions 11 at the outer end portions of the upper surface are used. As in the other embodiment shown in FIG. 3, the present invention can be similarly implemented using a stopper member 10b having no rising portion 11.

That is, in the embodiment of FIG.
The stopper member 10b is formed as a simple columnar inclusion, and the holding force due to the frictional force between the stopper member 10b and the support table 2 is reduced by the side wall piece 8 of the seismic isolation table 4 and the stopper member 1.
This embodiment differs from the above-described embodiment of FIG. 1 in that the holding force is larger than the holding force due to the frictional force between 0b.

Therefore, in this case, in the normal state shown in FIG. 3A, the relative displacement of the support table 2 and the seismic isolation table 4 in the horizontal direction is controlled by the side wall piece 8 of the seismic isolation table 4 and the stopper member 10b.
And locks, thereby preventing the seismic isolation table 4 from swaying due to vibration other than an earthquake, external force, strong wind, or the like.

On the other hand, the side wall piece 8
When a large vibration that overcomes the holding force between the support member 2 and the stopper member 10b is applied to the support table 2 side, the contact surface between the side wall piece 8 and the stopper member 10b slides and the support table 2 and the seismic isolation table 4 , A relative displacement in the horizontal direction occurs.

With the relative displacement between the support base 2 and the seismic isolation base 4, the concave surface 6 of the pedestal 3 on the support base 2 side is pressed against the steel ball 8 on the seismic isolation base 4 side, and the steel ball 8 rolls. The seismic isolation table 4 is lifted upward along the slope of the concave surface 6 while making a gap 12b in the contact surface between the side wall piece 8 and the stopper member 10b as shown in FIG. 3B.

Due to the formation of the gap 12b, the holding force on the upper and lower surfaces of the stopper member 10b is extremely reduced, and the stopper member 10b is released from the holding state by these frictional forces, as shown in FIG. The force is removed to an inoperative position below the locus x of the lower end of the side wall piece 8 due to the relative displacement between the support base 2 and the seismic isolation table 4 and not in contact with the side wall piece 8.

Thus, the seismic isolation device 1 unlocks the seismic isolation table 4 in response to the occurrence of the earthquake, and
b was removed to the inoperative position, and the seismic vibration immediately
To prevent the transmission to the original seismic isolation function.

Further, in the embodiment shown in FIG. 3, as shown in FIG. 4, a projection 13 is provided on the upper surface of the support 2 and a stopper member 10 having a slit 14 is provided.
By pivotally attaching the spring 9 using c, the stopper member 10a can be overturned by the projection 13 to efficiently and stably remove the stopper member 10a to an inoperative position where it does not collide with the seismic isolation table 4. .

When the relative position between the support 2 and the seismic isolation table 4 returns to the normal state after the earthquake has subsided, the stopper members 10b and 10c are immediately reset, and the seismic isolation table is reset by the stopper members 10b and 10c. Locking 4 is performed again to prevent the seismic isolation table 4 from swaying due to vibration other than the earthquake, external force, strong wind, etc., and prepare for the next earthquake.

Furthermore, as in the embodiment shown in FIGS. 5 and 6, stopper members 10d and 10e having wedge-shaped tapered surfaces 15 as contact surfaces between the side wall pieces 8 on the seismic isolation table 4 side are used. Can be implemented in the same manner.

That is, in this case, the stopper member 1 in the embodiment of FIGS. 1 and 2 described above is used.
Similarly to the angle α of the rising portion 11 of 0, 10a, the tapered surface 15
Is set to “α <β”, and the holding force due to the frictional force of the tapered surface 15 on the upper surfaces of the stopper members 10d and 10e is set to be larger than the holding force as the frictional force of the lower surface.

Thus, in the normal state shown in FIG. 5A, the steel ball 7 is removed from the center of the concave surface 6 of the base 3.
Is slightly lifted and kept in contact with each other, and the stopper members 10 d and 10 e are moved by the spring force of the spring 9 in accordance with the relative displacement between the support table 2 and the seismic isolation table 4.
As shown in FIG. 2B, the side walls 8 of the seismic isolation table 4 and the stopper members 10d and 10e are pulled while performing wedge action.
There is no gap at the contact surface with the contact.

Therefore, during this time, the relative displacement of the support base 2 and the seismic isolation base 4 in the horizontal direction is suppressed by the holding force at the contact surface between the support base 2 and the stopper members 10d and 10e, and the locking is performed. To prevent the seismic isolation table 4 from rolling due to vibration, external force and strong wind.

On the other hand, when a large vibration which overcomes the holding force between the support table 2 and the stopper members 10d and 10e is applied to the support table 2 due to the occurrence of the earthquake, the stopper members 10d and 10e are moved by the springs 9a. The stopper member 1 is greatly drawn while performing wedge action by the spring force of
The tapered surfaces 15 of 0d and 10e are tapered surfaces 1 on the side of the side wall piece 8.
Deviate from 5.

Thus, the stopper members 10d, 10e
As shown in FIG. 5c or FIG. 6, the side wall piece 8 accompanying the relative displacement between the support base 2 and the seismic isolation base 4 is generated by the spring force of the spring 9.
To the inoperative position below the side wall piece 8 below the locus x of the lower end of the or the protruding portion 13 to efficiently and stably eliminate the inoperative state.

Thus, the seismic isolation device 1 unlocks the seismic isolation table 4 in response to the occurrence of the earthquake and
By removing d and 10e to the inoperative position, the seismic vibration is prevented from being directly transmitted to the seismic isolation table 4, and the original seismic isolation function is performed.

When the relative position between the support 2 and the seismic isolation table 4 has returned to the normal state after the earthquake has subsided, the stopper members 10d and 10e are immediately reset, and the seismic isolation table is reset by the stopper members 10d and 10e. Locking 4 is performed again to prevent the seismic isolation table 4 from swaying due to vibration other than the earthquake, external force, strong wind, etc., and prepare for the next earthquake.

In each of the embodiments shown in FIGS. 3 and 4 and FIGS. 5 and 6, the stopper members 10b and 10c and the stopper members 10d and 10
Since the holding force as the frictional force on the upper and lower surfaces of the upper and lower surfaces e is extremely reduced, it goes without saying that the same effect can be obtained even if the magnitude relationship between the holding forces on the upper and lower surfaces is reversed.

In each of the embodiments described above, all the stopper members are removed by springs into the seismic isolation device 1. Needless to say, it may be excluded in one direction.

[0062]

As described above, according to the first aspect of the present invention, the unlocking of the seismic isolation device is performed depending on the seismic isolation operation without directly performing in anticipation of the earthquake vibration. Thereby, the lock member of the seismic isolation device can be effectively released by removing the stopper member to a state where the stopper member does not collide with the seismic isolation table in response to the occurrence of all the predetermined earthquakes or more.

Further, even in a normal state, even when subjected to vibrations other than an earthquake, external force, strong wind, etc., the seismic isolation device sways over a certain range, damaging the seismic isolation object and causing anxiety to a person. Therefore, the operation of the seismic isolation device can be reliably locked by the stopper member.

According to the second aspect of the present invention, in addition to the above-described effects, the stopper member is turned over and removed to the inoperative state when the lock of the seismic isolation device is released. The unlocking of the device can be efficiently and stably eliminated to the inoperative position.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual view schematically showing an embodiment of a trigger mechanism of a seismic isolation device according to the present invention, wherein (a) shows a normal state, and (b) shows an intermediate state during seismic isolation. It is a figure which shows a state and (c) shows the state which started seismic isolation action.

FIG. 2 is a partial view showing a case where a stopper member, which is a trigger mechanism of the seismic isolation device, is overturned to unlock the seismic isolation device.

FIG. 3 is a conceptual diagram showing a simplified form of another embodiment of the trigger mechanism of the seismic isolation device according to the present invention.
(A) is a diagram showing a normal state, (b) is a state in the middle of a seismic isolation operation, and (c) is a diagram showing a state of entering a seismic isolation operation.

FIG. 4 is a partial view in a case where a stopper member serving as a trigger mechanism of the seismic isolation device in another embodiment of FIG. 3 is overturned to unlock the seismic isolation device.

5A and 5B are conceptual diagrams schematically showing still another embodiment of the trigger mechanism of the seismic isolation device according to the present invention, wherein FIG. 5A shows a normal state, and FIG. It is a figure which shows the state in the middle of the effect | action, Furthermore, (c) shows the state which started the seismic isolation action.

FIG. 6 is a partial view showing a case where a stopper member serving as a trigger mechanism of the seismic isolation device according to still another embodiment of FIG. 5 is overturned to unlock the seismic isolation device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 seismic isolation device 2 support base 3 pedestal 4 seismic isolation base 6 concave surface of pedestal 7 steel ball 9 spring 10, 10a, 10b, 10c, 10d, 10e stopper member 13 protrusion 14 slit

Claims (2)

[Claims] 1. A pedestal having a concave support surface between a support base and a seismic isolation base, and a ball body that moves while rolling on the concave surface of the pedestal are opposed to each other. In the seismic isolation device that supports the seismic isolation table so that it can move in the horizontal direction with respect to the support table, a stopper member urged horizontally by a spring between the support table and the seismic isolation table is integrated. The seismic isolation table is mounted and held, and the seismic isolation table is placed directly on the support table by the stopper member to prevent the seismic isolation table from rolling due to external force other than the earthquake, and also to generate a large vibration such as when an earthquake occurs. Against the base, the seismic isolation base rises due to the relative displacement between the base and the ball, and the integral holding force of the support base and the seismic isolation base by the stopper member is released, and the spring does not abut the stopper member with the seismic isolation base The trigger mechanism of the seismic isolation device, which is removed to the inoperative position. 2. A pedestal having a concave support surface between a support base and a seismic isolation base, and a ball body which moves while rolling on the concave surface of the pedestal are opposed to each other. In the seismic isolation device that supports the seismic isolation table so that it can move in the horizontal direction with respect to the support table, a stopper member urged horizontally by a spring between the support table and the seismic isolation table is integrated. The seismic isolation table is mounted and held, and the seismic isolation table is placed directly on the support table by the stopper member to prevent the seismic isolation table from rolling due to external force other than the earthquake, and also to generate a large vibration such as when an earthquake occurs. In response to the rise of the seismic isolation base due to the relative displacement of the base and the ball, the integral holding force of the support base and the seismic isolation base by the stopper member is released, and the stopper member is pulled by a spring and installed on the support base. To the seismic isolation table. A trigger mechanism for a seismic isolation device, wherein the trigger mechanism eliminates an inoperative state that does not collide.