JP4010656B2 - Seismic isolation devices such as storage fixtures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device such as a storage fixture that can prevent a display case, a locker, a cabinet, furniture, and the like from falling when an earthquake occurs.
[0002]
[Prior art]
As this type of conventional seismic isolation device, for example, there are those disclosed in JP-A-9-173171 and JP-A-2-45038.
[0003]
[Problems to be solved by the invention]
The former seismic isolation device connects storage furniture placed on the floor so as to be movable in the front-rear direction, and is connected to the center of the floor board via four tension springs. This is controlled by the spring force of the tension spring to prevent the furniture from toppling over.
[0004]
This seismic isolation device has a seismic isolation structure only in the front-rear direction, so it can be expected to have a seismic isolation effect on horizontally long furniture that can easily fall forwards and backwards, but it has a cubical shape that can fall in the left-right direction. There is a problem that can not cope with furniture.
[0005]
On the other hand, in the latter seismic isolation device, dish-shaped recesses are formed at a plurality of locations on the lower plate laid under the furniture, and the furniture is placed on the upper plate supported by steel balls accommodated in the recesses. Because the steel ball rolls in the recess when an earthquake occurs, seismic isolation effects can be expected in any direction.
[0006]
However, the steel ball is simply housed in a dish-shaped recess, and the free rolling of the steel ball absorbs the shaking of the earthquake, so a small external force was applied even during normal use of putting in and out of furniture. Just swinging the furniture itself, it is difficult to use.
[0007]
In addition, since the size of the recess is limited, if a large earthquake occurs, the seismic isolation action may be lost and the furniture may fall over or the steel ball may jump out of the recess.
[0008]
The present invention has been made to solve the above-described problems. In addition to preventing shaking caused by a small external force during normal times, the two-dimensional shaking is absorbed to prevent the tipping over regardless of the shape of the fixture or the like. The purpose is to provide a seismic isolation device such as a storage fixture.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the seismic isolation device of the present invention is installed on the floor, and has a lower base in which a plurality of guide grooves are formed on both sides so that both ends are higher than the center. A plurality of guide grooves are formed above the lower base so as to be movable in the horizontal direction, facing the direction substantially perpendicular to the guide grooves of the lower base, and having both side portions lower than the center portion. And a movable body having a roller that is fitted in each of the guide grooves and can roll in the guide grooves, is provided between the lower base and the upper base. One of the opposing surfaces is provided with a friction material that abuts against the other opposing surface in a normal state.
By adopting such a configuration, when the lower base installed on the floor surface in the event of an earthquake sways in the two-dimensional direction, for example, forward or backward or left and right, the rollers fitted in the guide grooves in the upper and lower bases are stored. Since it rolls relatively back and forth or left and right against the load of a fixture or the like and repeats the upward movement, the kinetic energy at that time absorbs the energy of shaking. Therefore, the two-dimensional shaking of the storage fixture placed on the upper base in the front-rear or right-and-left directions is absorbed and it is prevented from falling in those directions. In addition, the sliding resistance of the friction material when the upper and lower bases move relative to each other can stop the shaking of the storage fixtures in a short time and prevent the storage fixtures etc. from moving in a normal state. Is done.
[0010]
In the above seismic isolation device, the length of each guide groove should be such that the center of gravity of a storage fixture placed on the upper base does not come out of the lower base even when the upper base moves to the maximum extent. preferable.
In this way, there is no fear that the storage fixture or the like will fall even if it shakes greatly.
[0012]
In the seismic isolation device, it is preferable to provide a concave portion into which a part of the roller can be fitted in a normal portion at the center of each guide groove.
If it does in this way, similarly to the above, it will prevent that a storage fixture etc. move in a delusion in normal time.
[0013]
In the seismic isolation device, it is preferable that the upper and lower bases are each covered with a cover.
By doing so, the guide grooves and the rollers fitted to the guide grooves are concealed, so that the appearance can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
FIG. 1 shows a display case 1 to which the present invention is applied. The display case 1 is fixedly placed on a seismic isolation device 2.
[0016]
2 is a plan view of the seismic isolation device 2, FIG. 3 is also a front view, and FIG. 4 is a right side view. The seismic isolation device 2 includes a pair of upper and lower base frames 3, which are square in plan view. 3 (upper base, lower base) and rectangular frame bodies 4a and 4b which are stacked and fixed so as to be perpendicular to each other at the center thereof, and the upper and lower sides covering each base frame 3 It consists of a pair of cover frames 5.
[0017]
As shown in FIGS. 5 and 6, the left and right side pieces 4 c of the lower frame body 4 a that is long in the left-right direction and the front and rear side pieces 4 d of the upper frame body 4 b that are long in the front-rear direction in the moving frame body 4. Each pair of rollers 6 is rotated around an axis facing in the left-right direction, and a pair of left and right rollers 6 rotated around an axis facing in the front-rear direction. Reference numeral 7 denotes a reinforcing piece fixed to four corners where the upper and lower frame bodies 4a and 4b intersect. Reinforcing pieces 7 are also fixed to the four corners of the upper and lower base frames 3.
[0018]
The upper and lower base frames 3 have a size that can accommodate the movable frame 4 without a backlash, and the front and rear frame plates 3a of the upper base frame 3 have apexes substantially at the center as shown in FIG. In addition, a pair of left and right guide grooves 8, 8 are formed in which both side portions gradually incline downward.
[0019]
The four rollers 6 of the upper frame 4b are fitted in each guide groove 8 so as to be able to roll, and in the normal state, each roller 6 is in the center of each guide groove 8 by its own weight of the upper base frame 3. It is designed to be located at the top.
[0020]
As shown in FIG. 4, the left and right frame plates 3b in the lower base frame 3 are formed with a pair of guide grooves 9 having a bottom portion at the substantially center and its both side portions inclined gradually upward, In each guide groove 9, four rollers 6 of the lower frame 4a are fitted so as to be able to roll.
[0021]
Each roller 6 is positioned at the bottom at the center of each guide groove 9 due to the weight of the upper base frame 3 and the movable frame body 4 in a normal state.
[0022]
When all the rollers 6 are positioned at the top and bottom of the guide grooves 8 and 9, respectively, the upper and lower base frames 3 are aligned vertically and a slight gap is formed between the opposing surfaces. It has become.
[0023]
The length of each of the guide grooves 8 and 9 is such that the display case 1 placed on the seismic isolation device 2 does not fall over even if each roller 6 rolls back and forth and left and right as much as possible. The center of gravity is set to a length that does not come out of the seismic isolation device 2.
[0024]
A friction pad 10 having a large frictional resistance is fixed to the front and rear of the upper base frame 3 and at the center of the left and right lower surfaces so as to be in sliding contact with the front and rear and left and right upper surfaces of the lower base frame 3.
[0025]
Adjuster bolts 12 for height adjustment are attached to the four corners of the lower surface of the lower base frame 3.
[0026]
Next, the operation of the above embodiment will be described.
[0027]
Since the load of the display case 1 is applied to the seismic isolation device 2 at normal times other than when an earthquake occurs, the roller 6 fitted in the guide groove 8 of the upper base frame 3 is as shown in FIG. In addition, the roller 6 that is positioned at the top of the guide groove 8 and that is fitted in the guide groove 9 of the lower base frame 3 is placed at the bottom that is the lowest point of the guide groove 9 as shown in FIG. positioned.
[0028]
When a horizontal shaking occurs from this state, the lower base frame 3 and the movable frame body 4 vibrate together with the floor surface, but the upper base frame 3 is shown in FIG. 7 (the cover frame 5 is not shown). (Omitted) Since the roller 6 fitted in the guide groove 8 moves in the left-right direction and repeats the ascending motion, the kinetic energy that raises the display case 1 at this time absorbs the energy of shaking. The large shake of 1 is not transmitted and the fall is prevented.
[0029]
On the other hand, when the shaking in the front-rear direction occurs, the lower base frame 3 vibrates with the floor surface, but each roller 6 fitted in the guide groove 9 moves back and forth as shown in FIG. The moving frame 4, the upper base frame 3 and the display case 1 are repeatedly raised by rolling in the direction and repeating the upward movement, and the energy of shaking is absorbed by the kinetic energy at this time, and the display case 1 is moved back and forth. Falling in the direction is prevented.
[0030]
When the rollers 6 pass through the top and bottom of the guide grooves 8 and 9 during the vibration in the front-rear and left-right directions, the friction pad 10 fixed to the lower surface of the upper base frame 3 is attached to the lower base frame 3. Since it is in contact with the upper surface, the shaking of the display case 1 can be terminated in a short time.
[0031]
Further, since the friction pad 10 is always in contact with the lower base frame 3 at normal time, there is no fear that the display case 1 will move with a small external force due to the frictional resistance.
[0032]
The present invention is not limited to the above-described examples, and can take various embodiments.
[0033]
For example, as shown in FIGS. 9 and 10, a recess 13 into which a part of the roller 6 is fitted may be formed at the top and bottom of the guide grooves 8 and 9 in the upper and lower base frames 3. If it does in this way, it will prevent that display case 1 moves easily in normal time.
[0034]
Moreover, as shown in FIG.11 and FIG.12, it is good also considering the upper and lower guide grooves 8 and 9 as circular arc shape which has a top part and a bottom part in the center part. Also in this case, it is preferable to form the recess 13 into which a part of the roller 6 is fitted at the top and bottom.
[0035]
It should be noted that the inclination angle and the radius of curvature of each of the guide grooves 8 and 9 described above can be appropriately set depending on the weight, height, shape, and the like of the fixture placed on the seismic isolation device 2.
[0036]
In the above embodiment, a pair of rollers 6 is provided only on the front and rear and left and right side edges of the upper and lower frame bodies 4a, 4b. You may make it fit in the guide groove of the horizontal rail horizontally laid in the intermediate part.
[0037]
In the above embodiment, the seismic isolation device 2 is separated from the storage fixture such as the display case 1, but the upper base frame 3 may be provided integrally with the lower portion of the storage fixture.
[0038]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0039]
(A) According to the first aspect of the present invention, for example, the vibration in the two-dimensional direction of the front and rear and the right and left is absorbed, so that the overturn can be prevented regardless of the shape of the storage fixture or the like. In addition, the sliding resistance of the friction material when the upper and lower bases move relative to each other can stop the shaking of the storage fixtures in a short time and prevent the storage fixtures etc. from moving in a normal state. Is done.
[0040]
(B) According to the invention described in claim 2, even if a large shake occurs, the storage fixture or the like is prevented from falling.
[0042]
( C ) According to the invention described in claim 3 , it is possible to more effectively prevent the storage fixture from shaking during normal times.
[0043]
( D ) According to the invention described in claim 4 , since the guide grooves of the upper and lower bases and the rollers fitted thereto are not exposed to the outside, the appearance is improved.
[0044]
[Brief description of the drawings]
FIG. 1 is a perspective view of an exhibition case to which the present invention is applied.
FIG. 2 is also a plan view of the seismic isolation device.
FIG. 3 is also a partially cutaway front view.
FIG. 4 is a right side view partially cut away.
FIG. 5 is a plan view of the moving frame body.
FIG. 6 is a front view of the moving frame body.
FIG. 7 is a front view of the same when shaking in the left-right direction.
FIG. 8 is also a right side view when shaking in the front-rear direction.
FIG. 9 is an enlarged front view showing another embodiment of the guide groove of the upper base frame.
FIG. 10 is an enlarged right side view showing another embodiment of the guide groove of the lower base frame.
FIG. 11 is an enlarged front view showing another embodiment of the guide groove of the upper base frame.
FIG. 12 is an enlarged right side view showing another embodiment of the guide groove of the lower base frame.
[Explanation of symbols]
1 display case (storage fixtures)
2 Seismic isolation device 3 Upper and lower base frames (upper and lower bases)
3a, 3b Frame plate 4 Moving frame (moving body)
4a, 4b Frame 4c, 4d Side piece 5 Cover frame (cover)
6 Roller 7 Reinforcement piece 8, 9 Guide groove 10 Friction pad (friction material)
12 Adjuster bolt 13 Recess

Claims (4)

A lower base is installed on the floor, and has a plurality of guide grooves formed on at least both sides, both ends of which are higher than the central portion. The lower base is horizontally movable above the lower base. And an upper base formed with a plurality of guide grooves that are oriented in a direction substantially orthogonal to the guide grooves of the lower base and whose both side portions are lower than the center portion, and the lower base and the upper base A moving body having a roller that is fitted in each of the guide grooves and can roll in the guide grooves is provided therebetween , and one of the opposing surfaces of the upper and lower bases is normally provided with the other opposing surface. A seismic isolation device, such as a storage fixture , provided with a friction material that comes into contact with the housing.   2. The storage fixture according to claim 1, wherein the length of each guide groove is set such that the center of gravity of the storage fixture placed on the upper base does not protrude outward from the lower base even when the upper base moves to the maximum extent. Etc. Seismic isolation device. The seismic isolation device for a storage fixture or the like according to claim 1 or 2 , wherein a concave portion into which a part of the roller can be fitted in a normal state is provided at a central portion of each guide groove. The seismic isolation device for a storage fixture or the like according to any one of claims 1 to 3 , wherein the upper and lower bases are each covered with a cover.

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