JP4034411B2 - Seismic isolation device for storage fixtures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device capable of preventing a storage fixture (including lockers, cabinets, refrigerators, furniture, and the like) from falling over when an earthquake occurs.
[0002]
[Prior art]
An example of this type of conventional seismic isolation device is disclosed in Japanese Utility Model Publication No. 2-45038.
[0003]
In this conventional seismic isolation device, dish-shaped recesses are formed at a plurality of positions on a lower plate laid under the furniture, and the furniture is placed on an upper plate supported by steel balls accommodated in the recesses. In this way, the steel ball rolls off in the recess when an earthquake occurs, so that it is isolated.
[0004]
[Problems to be solved by the invention]
However, in the conventional seismic isolation device described above, the steel ball is simply housed in the dish-shaped recess, and the free rolling of the steel ball absorbs the shaking of the earthquake. Even during normal use, the furniture itself can be shaken just by applying a small external force, making it difficult to use.
[0005]
In addition, the size of the recess is limited due to the size of the bottom of the furniture, so if an earthquake with a large amplitude occurs, the seismic isolation action may be lost and the furniture may fall over, or the steel ball may jump out of the recess .
[0006]
The present invention has been made to solve the above-described problems, and prevents shaking caused by a small external force such as loading and unloading of articles, and is also a seismic isolation device for a storage fixture that does not fall over even if a large amplitude earthquake occurs. The object is to provide a device.
[0007]
In order to achieve the above object, the seismic isolation device for a storage fixture according to the present invention is directed to the right side and the left side by urging means on the left and right sides of the upper surface of the central portion of the floorboard installed on the floor. And at least one pair of left and right sliding members that are biased by the front and rear sides of the storage fixture placed on the floor plate so as to be movable in the front-rear direction or both left and right sides at the bottom of the placement table. The facing surfaces facing each other have at least a pair of guide surfaces in which the front and rear surfaces starting from the center have a maximum recess at the center of the length in the front-rear direction and are curved inward or in an arcuate shape. The vibration control plate is provided so that each sliding member is pressed against each guide surface of the vibration control plate, and the left and right sliding members are provided on the left and right as the floor plate moves in the front-rear direction. Against the biasing means along the guide surface of It is characterized in that so as to movement.
According to the present invention configured as described above, when the laying board swings in the front-rear direction due to the occurrence of an earthquake, the sliding member slides in the inclined direction against the biasing means on the guide surface of the damping plate, thereby storing the sliding plate. Shaking of the fixtures in the front-rear direction is reduced. In addition, the swinging movement of the storage fixture in the usage form can be prevented.
[0008]
In order to achieve the above object, the seismic isolation device for a storage fixture of the present invention is such that the opposing surfaces facing in the front-rear direction are on the left and right sides of the upper surface of the center portion of the floor plate installed on the floor surface. And provided with at least one pair of vibration damping plates having a guide surface in which the front and rear surfaces starting from that portion have a maximum dent at the center of the length and are curved inward or curved in an arc shape, At least left and right 1 urged toward the right side and the left side by urging means respectively on the bottom of the storage fixture placed on the floor plate so as to be movable in the front-rear direction or on the left and right sides of the bottom of the placement table provided sliding member pairs, each guide surface in the damper plate, wherein the sliding member is pressed against the, with the movement in the longitudinal direction of the laying plate, the damper plate of the pair is governed by the guide surface The urging hand for urging the sliding member provided on It is characterized in the that to move against.
According to the present invention having the above configuration, when the laying board sways in the front-rear direction due to the occurrence of an earthquake,
A pair of damping plates move against the biasing means for biasing the sliding member;
The shaking of the storage fixture in the front-rear direction is reduced. In addition, the swinging movement of the storage fixture in the usage form can be prevented.
[0009]
In the seismic isolation device, it is preferable that the sliding member is a grooved roller and the guide surface is pressed into the groove.
If it does in this way, while a sliding member will move smoothly, a roller will not remove | deviate from a damping plate, even if it rocks vertically.
[0010]
In the above-described seismic isolation device, it is preferable that the biasing means is a cylinder type damper in which a compression coil spring and / or a pressure fluid is enclosed.
If it does in this way, the absorptivity and damping of a vibration will become large, and even a heavy storage fixture will be effectively isolated.
[0011]
In the above-mentioned seismic isolation device, it is preferable that support rollers that rotate about axes that face in the left-right direction are provided on at least four corners of the lower part of the storage fixture or the mounting table so as to roll on the floor plate.
If it does in this way, since a storage fixture or its mounting base moves smoothly on the upper surface of a laying board, there is no possibility that a storage fixture with a high height will fall.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 shows a cabinet 1 to which the present invention is applied, and the cabinet 1 is placed on a seismic isolation device 2 below the cabinet 1.
[0014]
The seismic isolation device 2 has a thin metal laying plate 3 having a substantially square shape whose left and right length is substantially equal to the left and right length of the cabinet 1, and a seismic isolation that is mounted on the upper surface of the central portion and is substantially the same shape as the bottom surface of the cabinet 1. It consists of a stand 4.
[0015]
As shown in FIGS. 2 to 4, a pair of left and right vibration damping means 5 are provided symmetrically on the upper surface of the center portion of the laying plate 3. Both vibration damping means 5 have the same configuration, and only the vibration damping means 5 on the right side in the figure will be described, and a detailed description of the left one will be omitted.
[0016]
The vibration damping means 5 is fitted in an upward U-shaped guide plate 6 fixed to the upper surface of the floor plate 3 so as to face in the left-right direction, and slidable in the left-right direction in the U-shaped space of the guide plate 6. A downward U-shaped moving member 7, a grooved roller 8 rotatably mounted around the vertical axis at the right end of the moving member 7, and a compression that constantly urges the moving member 7 to the right. The compression coil spring 9 is housed in the moving member 7, and both ends thereof are fixed to the partition wall 7 a at the right end of the moving member 7 and the stopper plate 10 fixed to the upper surface of the left end of the guide plate 6. And are in pressure contact with each other.
[0017]
The opening on the upper surface of the guide plate 6 is covered with the closing plate 11 to prevent the moving member 7 from floating upward. At the left end of the guide plate 6, a stopper piece 6a for restricting the maximum amount of movement of the moving member 7 to the left is continuously provided upward.
[0018]
The base isolation table 4 has a frame shape whose upper surface is closed by the upper plate 4a, and both front and rear ends of the downward U-shaped reinforcing members 12, 12 fixed to the lower surfaces of the left and right sides of the upper plate 4a in the front-rear direction. That is, support rollers 13 that rotate about a horizontal axis that faces in the left-right direction are pivotally supported at the four corners of the base isolation table 4.
[0019]
Each support roller 13 rolls in contact with the upper surface of the floor plate 3 to move the base isolation table 4 in the front-rear direction.
[0020]
On the opposing surfaces of the left and right reinforcing members 12, that is, on the right surface and the left surface, a damping plate 14 that is slightly shorter than the reinforcing member 12, respectively, and the opposing surface of the inwardly facing piece 14a has a groove width of the grooved roller 8. It is fixed so as to be almost level with the central portion.
[0021]
The facing surfaces of the inward pieces 14a of the left and right damping plates 14 have a maximum recessed portion at the center portion obtained by dividing the length in the front-rear direction into two, and the front and rear surfaces starting from that portion are inward of each other. It becomes the guide surface 14b which inclines at equal angles toward. Each of these guide surfaces 14b is in pressure contact with the central portion of the grooved roller 8, and the grooved roller 8 rolls along the guide surface 14b.
[0022]
Further, since the grooved roller 8 is biased outward by the compression coil spring 9, the grooved roller 8 is normally located at the center of the guide surface 14 b, and the base isolation table 4 is always located at the center of the laying plate 3. It becomes like this.
[0023]
When the grooved roller 8 rolls to the vicinity of the front and rear ends of the guide surface 14b, as shown in FIG. 5, the moving member 7 moves to the left as much as possible and comes into contact with the stopper piece 6a. It is prevented that the wheel 14 is removed from the surface 14b.
[0024]
At this time, the front and rear lengths of the floor plate 3 are set so that the support roller 13 on the moving direction side of the base isolation table 4 is separated from the edge of the floor plate 3 (see FIG. 6).
[0025]
In the above embodiment, when the laying plate 3 swings in the front-rear direction when an earthquake occurs, the roller 8 pivotally attached to the moving member 7 in the vibration damping means 5 moves along the guide surface 14b of the vibration damping plate 14 along with the compression coil spring. By rolling against 9, shaking of the cabinet 1 mounted on the seismic isolation table 4 is reduced and its fall is prevented.
[0026]
When the earthquake stops, the grooved roller 8 rolls to the center of the guide surface 14b, so that the base isolation table 4 and the cabinet 1 naturally return to the center position of the laying board 3.
[0027]
When the grooved roller 8 rolls up to the vicinity of the front and rear ends of the guide surface 14b due to a large earthquake, either the front or rear support roller 13 of the base isolation table 4 is disengaged from the edge of the laying plate 3, and the floor surface (illustrated) (Omitted) Since the top moves with the laying plate 3, there is no fear that the cabinet 1 will fall. The support roller 13 removed from the laying plate 3 rides on the laying plate 3 again when the laying plate 3 swings back to the opposite side. Note that the front and rear edges of the laying plate 3 may be inclined obliquely downward so that the roller 13 can easily ride on.
[0028]
As described above, when the seismic isolation device 2 of the above embodiment is used, the vibration of the earthquake is effectively absorbed by the damping means 5 and the damping plate 14, so that the seismic isolation action of the cabinet 1 becomes large. The fall can be prevented.
[0029]
Further, the action of the compression coil spring 9 and the inclined guide surface 14b of the damping plate 14 allows the cabinet 1 to be always positioned at the center of the laying plate 3, and further compresses according to the size of the cabinet 1 and the like. By appropriately changing the spring constant of the coil spring 9 or the inclination angle of the guide surface 14b, it is possible to prevent the cabinet 1 from swinging back and forth as in the prior art in normal use conditions such as withdrawing / inserting.
[0030]
Since the longitudinal length of the floor plate 3 is made larger than that of the base isolation table 4, the mounting area of the base isolation table 4 and the cabinet 1 mounted thereon is substantially increased, and stability against shaking is increased. Will increase.
[0031]
Since the roller 5 of the vibration damping means 5 is a grooved roller 8 and is brought into pressure contact with the guide surface 14b of the vibration damping plate 14, the roller 8 does not come off the guide surface 14b even if longitudinal vibration occurs. The loss of seismic action is prevented.
[0032]
The seismic isolation device 2 as a single unit can be easily attached to a storage fixture such as an existing locker or furniture, and since the structure is simple and the height of the device is low, it can be replaced as a substitute for an existing furniture stand. it can.
[0033]
When a large earthquake occurs, the support roller 13 either before or after the base isolation table 4 comes off the floor plate 3 and rolls on the floor surface, so that the danger of the cabinet 1 falling over is avoided. That is, if the roller 13 does not come off the laying plate 3, the cabinet 1 may fall down together with the laying plate 3 with the roller 13 opposite to the vibration direction as a fulcrum.
[0034]
The present invention is not limited to the above-described examples, and can take various embodiments.
[0035]
For example, the sliding member 8 can be provided on the storage fixture 1 or the mounting table 4, and the damping plate 14 can be provided on the laying plate 3. The damping plate 14 is provided with an arcuate guide surface 14 c as shown in FIG. 7. It is good.
[0036]
Further, the biasing means of the roller 8 in the vibration damping means 5 is a cylinder type damper as shown in FIG. 8, that is, a pressure fluid such as a compressed coil spring 16 or compressed air or inert gas, in the cylinder body 15. Alternatively, both of them may be enclosed, and the piston rod 17 having the roller 8 pivotally attached to the tip may be urged.
[0037]
If such a cylinder type damper is used, vibration absorption and damping can be increased, which is suitable for seismic isolation of a heavy fixture.
[0038]
In the above embodiment, the support rollers 13 are provided at the four corners of the base isolation table 4, but instead of the support rollers 13, spherical protrusions such as coin plastic having a small sliding frictional resistance may be used.
[0039]
In addition, although the base isolation table 4 is separate from the cabinet 1, it is a matter of course that the vibration isolation plate 14, the support roller 13 and the like may be provided directly on the bottom of the cabinet 1 and the base isolation table 4 may be omitted. .
[0040]
Instead of the roller 8 of the vibration damping means 5, a sliding piece such as a coin plastic having a small sliding frictional resistance may be used and moved on the guide surface 14b by sliding.
[0041]
In the embodiment, the maximum moving amount of the moving member 7 is regulated by the stopper piece 6a to prevent the roller 8 from falling off the damping plate 14, but a stopper is provided at the front and rear ends of the damping plate 14. Thus, the roller 8 may be prevented from rolling.
[0042]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0043]
(A) According to the inventions of claims 1 and 2, when the laying board swings in the front-rear direction due to an earthquake or the like, the sliding member slides in the inclined direction on the guide surface of the damping plate, so that the shaking of the storage fixture is reduced. The fall is prevented.
[0044]
Moreover, since the sliding member is located in the largest dent part of a guide surface at the normal time, a storage fixture does not rock back and forth in normal use conditions, such as putting in and out of an article.
[0045]
(B) According to the invention of claim 3, while the sliding member moves smoothly, the roller does not come off from the guide surface of the damping plate even when the sliding member is swayed.
[0046]
(C) According to the invention of claim 4, vibration absorption and damping are increased, so that even a heavy storage fixture can be effectively isolated.
[0047]
(D) According to the invention of claim 5, since the storage fixture or its mounting table moves smoothly on the laying plate, there is no fear that the storage fixture with a high height falls.
[0048]
[Brief description of the drawings]
FIG. 1 is a perspective view of a cabinet to which the present invention is applied.
FIG. 2 is an enlarged cross-sectional plan view taken along the line II-II in FIG.
FIG. 3 is a longitudinal front view of a main part taken along line III-III in FIG. 2;
FIG. 4 is a longitudinal side view taken along the line IV-IV in the same manner.
FIG. 5 is a cross-sectional plan view of the main part when the roller of the vibration damping means moves to the rear limit of the vibration damping plate.
6 is a longitudinal side view along the line VI-VI of FIG.
FIG. 7 is a cross-sectional plan view showing another embodiment of the guide surface of the damping plate.
FIG. 8 is a cross-sectional plan view showing another embodiment of the urging means.
[Explanation of symbols]
1 cabinet (storage fixtures)
2 Seismic isolation device 3 Base plate 4 Base isolation table (mounting table)
5 Damping means 6 Guide plate 6a Stopper piece 7 Moving member 7a Partition 8 Grooved roller (sliding member)
9 Compression coil spring (biasing means)
DESCRIPTION OF SYMBOLS 10 Stopper plate 11 Blocking plate 12 Reinforcing member 13 Support roller 14 Damping plate 14a Inward pieces 14b, 14c Guide surface 15 Cylinder body 16 Compression coil spring 17 Piston rod

Claims (5)

At least one pair of left and right sliding members urged toward the right side and the left side by the urging means are provided on the left and right sides of the upper surface of the central portion of the laying plate installed on the floor surface, and the laying plate On the left and right sides of the bottom of the storage fixture placed so as to be movable in the front-rear direction or the bottom of the placement table, the opposing surfaces facing each other in the front-rear direction are the maximum recesses in the center of the length in the front-rear direction. And at least one pair of damping plates that form a guide surface whose front and rear surfaces starting from that portion are inclined or arcuate inwardly, The sliding member is brought into pressure contact , and the left and right sliding members are moved against the urging means along the guide surfaces of the vibration control plates provided on the left and right as the floor plate moves in the front-rear direction. A seismic isolation device for storage fixtures. On the left and right sides of the upper surface of the central part of the floor plate installed on the floor surface, the opposing surfaces facing each other in the front-rear direction have a maximum recess in the center part of the length in the front-rear direction, and that part is the starting point. And at least one pair of damping plates that form guide surfaces that are curved in an inwardly inclined or arcuate manner, and a bottom portion of a storage fixture that is placed on the floor plate so as to be movable in the front-rear direction, or At least one pair of left and right sliding members urged toward the right side and the left side by the urging means are provided on the left and right sides of the bottom of the mounting table. The sliding members are pressed against each other, and the pair of damping plates move against the biasing means for biasing the sliding members provided on the left and right by the guide surfaces as the floor plate moves in the front-rear direction. Base storage furniture, characterized in that the the like Apparatus.   The seismic isolation device for a storage fixture according to claim 1 or 2, wherein the sliding member is a grooved roller, and the guide surface is pressed into the groove.   The seismic isolation device for a storage fixture according to any one of claims 1 to 3, wherein the urging means is a cylinder type damper in which a compression coil spring and / or pressure fluid is enclosed.   The storage according to any one of claims 1 to 4, wherein support rollers that rotate around an axis directed in the left-right direction are provided at least at the four corners of the lower portion of the storage fixture or the mounting table so as to roll on the floor plate. Seismic isolation device for fixtures.

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