JP2000014472A - Base isolation device for housed article or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb swing energy by kinetic energy by rolling rollers fitted in the guide grooves of the upper and lower bases relatively back and forth and laterally against the load of housed utensils or the like and repeating the rising motion, when the lower base installed on a floor face swings in the two- dimentional direction of the fore and aft and right and left sides. SOLUTION: When a lateral swing occurs, a lower base frame 3 and a transfer frame body swing together with a floor face. But in an upper base frame 3, rollers 6 fitted to guide grooves 8 transfer in the right and left direction to repeat the rising motion. In this time, the kinetic energy moving up the a show case 1 absorbs the swing energy. When a before and behind swing occurs, the lower side tease frame 3 swings together with the floor face. But respective rollers 6 fitted in the guide grooves 9 rolls back and forth and repeats a rising motion. Thereby, the transfer frame body, the upper side base frame 3, and the show case 1 as well repeat the rising motion. The swing energy is absorbed by the kinetic energy generated in this time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to
The present invention relates to a seismic isolation device such as a storage fixture which can prevent a display case, a locker, a cabinet, furniture and the like from falling down.

[0002]

2. Description of the Related Art A conventional seismic isolation device of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. HEI 9-173171 and Japanese Utility Model Application Laid-Open No. 2-4503.
No. 8 discloses a technique disclosed in Japanese Patent Laid-Open Publication No. 8 (1999) -86.

[0003]

According to the former seismic isolation device, the storage furniture mounted on the floor so as to be movable in the front-rear direction is connected to the center of the floor plate via four tension springs. The movement of the stored furniture in the front-rear direction at the time of occurrence is regulated by the spring force of a tension spring to prevent the furniture from falling.

[0004] This seismic isolation device has a seismic isolation structure only in the front-back direction, so that it can be expected to have a seismic isolation effect on horizontally long furniture that easily falls down back and forth, but a cube that may fall down in the left-right direction. There is a problem that can not cope with the shape storage fixtures.

On the other hand, in the latter seismic isolation device, a dish-shaped recess is formed at a plurality of locations on a lower plate laid below furniture, and an upper plate supported by steel balls accommodated in the recess is formed on the lower plate. Since the furniture is placed, the steel ball rolls in the recess when an earthquake occurs, so that a seismic isolation effect can be expected in any direction.

However, since the steel balls are simply housed in a dish-shaped recess and the free rolling of the steel balls absorbs the shaking of the earthquake, a small external force can be applied even in a normal use of taking in and out of stored items from furniture. There is a problem that the furniture itself shakes just by adding the, and it is difficult to use.

Also, since the size of the recess is limited,
When a large earthquake occurs, the seismic isolation function is lost, and furniture may fall or the steel ball may jump out of the recess.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and prevents shaking due to a small external force in a normal state and absorbs shaking in a two-dimensional direction, thereby irrespective of the shape of furniture and the like. It is an object of the present invention to provide a seismic isolation device such as a storage fixture that can prevent the fall.

[0009]

In order to achieve the above object, a seismic isolation device according to the present invention is provided on a floor, and is provided on at least both sides such that both ends are higher than the center. A lower base having a guide groove formed therein, and is provided above the lower base so as to be movable in a horizontal direction. The lower base is oriented in a direction substantially orthogonal to the guide groove of the lower base, and both side parts are lower than the center part. A movement having an upper base on which a plurality of guide grooves are formed, and a roller between the lower base and the upper base, which is fitted into each of the guide grooves and is capable of rolling in the guide grooves. It is characterized by having a body. With such a configuration, when the lower base installed on the floor surface shakes, for example, in two-dimensional directions of front and rear or left and right when an earthquake occurs, the rollers fitted into the respective guide grooves in the upper and lower bases are stored. Since the ascending motion is repeated by rolling relatively back and forth or left and right against the load of the furniture and the like, the kinetic energy at that time absorbs the energy of the shaking. Therefore, the swing of the storage fixture placed on the upper base in the front-back or left-right two-dimensional directions is absorbed, and it is possible to prevent the storage fixture from falling in those directions.

In the above seismic isolation device, the length of each guide groove is set so that the center of gravity of storage fixtures and the like placed on the upper base does not protrude outside the lower base even when the upper base moves to the maximum. Is preferred. In this case, there is no danger that the storage fixtures and the like will fall over even with a large swing.

In the above seismic isolation device, it is preferable to provide a friction material that normally comes into contact with the other opposing surface on one of the opposing surfaces of the upper and lower bases. With this configuration, the swing resistance of the storage fixture or the like can be stopped in a short time due to the sliding resistance of the friction material when the upper and lower bases relatively move, and the storage fixture or the like moves sloppyly in normal times. Is prevented.

In the above-described seismic isolation device, it is preferable to provide a recess in the center of each guide groove, into which a part of the roller can be normally fitted. In this manner, similarly to the above, it is possible to prevent the storage fixtures and the like from moving sloppyly in normal times.

In the above seismic isolation device, it is preferable that the upper and lower bases are respectively covered by covers.
In this way, the guide grooves and the rollers fitted in the guide grooves are concealed, so that the appearance can be improved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a display case 1 to which the present invention is applied. The display case 1 is fixedly mounted on a seismic isolation device 2.

FIG. 2 is a plan view of the seismic isolation device 2, FIG. 3 is a front view thereof, and FIG. 4 is a right side view thereof. Frame 3, 3
(Upper base, lower base) and rectangular frames 4a, 4
The moving frame 4 is composed of a movable frame 4 which is overlapped and fixed at right angles in the center at a central portion thereof, and a pair of upper and lower cover frames 5 which cover the periphery of each base frame 3.

As shown in FIGS. 5 and 6, the left and right side pieces 4c of the lower frame 4a of the movable frame 4 that are long in the left-right direction.
The front and rear side pieces 4d of the upper frame body 4b, which are long in the front and rear direction, have front and rear 1 rotating around an axis facing the left and right direction, respectively.
A pair of rollers 6 and a pair of right and left rollers 6 rotating about an axis extending in the front-rear direction are pivotally mounted. Reference numeral 7 is a reinforcing piece fixed to the four corners where the upper and lower frame members 4a and 4b intersect. Reinforcing pieces 7 are also fixed to the four corners of the upper and lower base frames 3.

The upper and lower base frames 3 are large enough to hold the moving frame 4 without any backlash, and the frame plates 3a before and after the upper base frame 3 are substantially centered as shown in FIG. A pair of left and right guide grooves 8, 8 each having an apex and having a substantially U-shaped shape whose both sides are gradually inclined downward are formed.

The four rollers 6 of the upper frame 4b are fitted in the respective guide grooves 8 so as to be able to roll. 8 is located at the top of the center.

Left and right frame plates 3b of the lower base frame 3
As shown in FIG. 4, a pair of front and rear guide grooves 9 having a bottom substantially in the center and both sides gradually inclined upward are formed, and each of the guide grooves 9 has a lower frame body. Four rollers 6a are fitted so as to be rollable.

Normally, each roller 6 is located at the bottom of the center of each guide groove 9 due to the weight of the upper base frame 3 and the movable frame 4.

In a normal state in which all the rollers 6 are located at the top and bottom of each of the guide grooves 8 and 9, the upper and lower base frames 3 are aligned vertically, and a slight gap is formed between the opposing surfaces. It is supposed to be.

The length of each of the guide grooves 8 and 9 is
The length of the display case 1 placed on the seismic isolation device 2 so that it does not fall over even if it rolls to the front, back, left and right as much as possible, ie, the length of the center of gravity of the display case 1 that does not protrude outside the seismic isolation device 2 is there.

A friction pad 10 having a large frictional resistance is fixed to the central portion of the front and rear and left and right lower surfaces of the upper base frame 3 so as to be in sliding contact with the front and rear and left and right upper surfaces of the lower base frame 3. I have.

At four corners on the lower surface of the lower base frame 3, adjuster bolts 12 for height adjustment are mounted.

Next, the operation of the above embodiment will be described.

During normal times other than when an earthquake occurs, since the load of the display case 1 is applied to the seismic isolation device 2, the rollers 6 fitted in the guide grooves 8 of the upper base frame 3 As shown in the figure, while being located at the top of the guide groove 8,
Roller 6 fitted in guide groove 9 of lower base frame 3
Is located at the bottom, which is the lowest point of the guide groove 9, as shown in FIG.

When the left-right swaying occurs in this state, the lower base frame 3 and the movable frame 4 vibrate together with the floor surface, but the upper base frame 3 moves as shown in FIG. (Not shown), the roller 6 fitted in the guide groove 8 moves in the left-right direction and repeats the upward movement, and the kinetic energy for raising the display case 1 at this time absorbs the energy of the swing. The large swing of the display case 1 is not transmitted, and the fall of the display case 1 is prevented.

On the other hand, when the back-and-forth vibration occurs,
Although the lower base frame 3 vibrates together with the floor surface, each roller 6 fitted in the guide groove 9 rolls in the front-rear direction and repeats the upward movement as shown in FIG. The moving frame body 4, the upper base frame 3 and the display case 1 also rise repeatedly, and the energy of the sway is absorbed by the kinetic energy at this time, and the display case 1 is prevented from falling over in the front-rear direction.

When the rollers 6 pass through the tops and bottoms of the guide grooves 8 and 9 during the above-described front-back and left-right vibrations, the friction pad 1 fixed to the lower surface of the upper base frame 3 is formed.
Since 0 contacts the upper surface of the lower base frame 3, the swing of the display case 1 can be stopped in a short time.

In normal operation, the friction pad 10
Is always in contact with the lower base frame 3, so that there is no danger that the display case 1 will move with a small external force due to its frictional resistance.

The present invention is not limited to the above embodiment, but can take various embodiments.

For example, as shown in FIGS. 9 and 10, concave portions 13 into which a part of the roller 6 is fitted may be formed at the top and bottom of the guide grooves 8, 9 in the upper and lower base frames 3. This prevents the display case 1 from easily moving in normal times.

As shown in FIGS. 11 and 12, the upper and lower guide grooves 8, 9 may be formed in an arc shape having a top and a bottom at the center. Also at this time, the rollers 6
It is preferable to form a concave portion 13 into which a part of is fitted.

The inclination angles and the radii of curvature of the guide grooves 8 and 9 can be appropriately set according to the weight, height, shape, etc. of the fixtures and the like mounted on the seismic isolation device 2. It is.

In the above embodiment, a pair of rollers 6 is provided only on the front and rear and left and right side ends of the upper and lower frame members 4a and 4b. The guide frame may be fitted in a guide groove of a horizontal rail suspended from the middle of the base frame 3.

In the above embodiment, the seismic isolation device 2 is separate from the storage fixtures such as the display case 1, but the upper base frame 3 may be provided integrally with the lower part of the storage fixture.

[0038]

According to the present invention, the following effects can be obtained.

(A) According to the first aspect of the present invention, for example, a two-dimensional swing in the front-back, left-right direction is absorbed.
Regardless of the shape of the storage fixtures and the like, the falling can be prevented.

(B) According to the second aspect of the present invention, it is possible to prevent the storage fixtures and the like from falling even when a large swing occurs.

(C) According to the third aspect of the invention, the shaking of the storage fixture or the like can be stopped in a short time due to the sliding resistance of the friction material when the upper and lower bases relatively move. At the same time, it is possible to prevent the storage fixtures from moving sneakly during normal times.

(D) According to the fourth aspect of the present invention, it is possible to more effectively prevent the storage fixtures from swaying during normal operation.

(E) According to the fifth aspect of the present invention, since the guide grooves of the upper and lower bases and the rollers fitted therein are not exposed to the outside, the appearance and appearance are improved.

[0044]

[Brief description of the drawings]

FIG. 1 is a perspective view of a display case to which the present invention is applied.

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

FIG. 3 is also a partially cutaway front view.

FIG. 4 is a partially cutaway right side view.

FIG. 5 is a plan view of the moving frame.

FIG. 6 is a front view of the moving frame.

FIG. 7 is a front view when the camera shakes in the left-right direction.

FIG. 8 is a right side view of the vehicle when swinging back and forth.

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]

 DESCRIPTION OF SYMBOLS 1 Display case (storage fixture) 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 (5)

[Claims] 1. A lower base provided on a floor surface and having a plurality of guide grooves formed at least on both sides such that both ends are higher than a center portion, and a horizontal direction above the lower base. An upper base having a plurality of guide grooves formed so as to be movable and oriented in a direction substantially orthogonal to the guide grooves of the lower base, and having both sides lower than a central part; and A seismic isolation device for storage fixtures and the like, characterized in that a movable body having rollers that are fitted in the respective guide grooves and can roll in the guide grooves is provided between the upper base and the upper base. 2. The length of each guide groove is such that the center of gravity of a storage fixture or the like placed on the upper base does not protrude outside the lower base even if the upper base moves to the maximum. Seismic isolation devices such as storage fixtures described in. 3. The seismic isolation device for a storage fixture or the like according to claim 1, wherein a friction material is provided on one of the opposing surfaces of the upper and lower bases in normal contact with the other opposing surface. 4. The seismic isolation device for a storage fixture or the like according to claim 1, wherein a recessed portion into which a part of a roller can be normally inserted is provided at a central portion of each guide groove. 5. The seismic isolation device for storage fixtures and the like according to claim 1, wherein the upper and lower bases are respectively covered with covers.