JP3706266B2 - Base isolation table - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a base isolation table using a ball.
[0002]
[Prior art]
There are various types of seismic isolation tables (seismic isolation devices), one of which is to allow the ball to roll freely between the upper and lower bases so that the upper and lower bases move relative to each other in the horizontal direction. There are types. MenShindai of this type since it is possible to relatively moving in any direction of the vertical base in plan view, there is what direction the rocking Re may seismic isolation benefits. In addition, since the vertical base moves relative to the ball, the relative movement stroke can be increased without increasing the size of the vertical base, compared to a base with a roller attached to the upper base. As a result, there is an advantage that the seismic isolation function can be improved.
[0003]
For example, as shown in FIG. 16 , the base-isolated table using the ball supports the base-isolated object in a stable state by arranging about four pairs of upper and lower base portions A at an appropriate interval. In general, the upper surface of the lower base portion B and the lower surface of the upper base portion A are concave surfaces that become deeper as they go to the center thereof, so that the upper and lower base portions A and B return to their original positions. Become selfish.
[0004]
Japanese Patent Laid-Open No. 9-291720 as a prior art eliminates an abnormal operation caused by each ball C moving in an arbitrary direction, and each ball C is placed at the center of each base portion A, B after the end of the earthquake. for the purpose of to return, each ball C enclosure in its Rezoreha maggots ring D, be connected integrally to respective housings D in connecting member E, in other words, the retainer F comprising a connecting member E and housing D Describes that the positional relationship of the balls C is kept constant.
[0005]
[Problems to be solved by the invention]
By the way, the motion of an earthquake is complicated, and the force which rotates this horizontally with respect to the lower base B may act depending on the case. In However the prior art, since the positional relationship between each ball C is merely being held constant, the external force is applied such as to horizontally pivot under the base B, as indicated by one-dot chain lines in FIG. 16, the retainer F Turns horizontally relative to the lower base B, and the posture of the retainer F with respect to the lower base B may change.
[0006]
In this case, since the upper base A moves by twice the moving distance of the retainer F via the ball C, the upper base A and the seismic isolation object rotate by an angle 2θ that is twice the turning angle θ of the retainer F. It will end up.
[0007]
In an actual earthquake, the retainer F reciprocally turns while reciprocating in the horizontal direction with respect to the lower base B, and moves complicatedly. Therefore, the upper base A and the seismic isolation object are extremely As a result, the seismic isolation object may fall over very easily. In particular, when the height is higher than the bottom area, such as a cabinet or a display case, the risk of falling is doubled.
[0008]
The present invention has been made for the purpose of improving such a situation.
[0009]
[Means for Solving the Problems]
The base isolation table according to the present invention includes a rectangular upper and lower bases arranged so as to overlap in a plan view, and a rollable base between the upper and lower bases so that the upper and lower bases can move relative to each other in a plan view. and four balls is, a retainer 4 balls before SL during vertical base is relative movement in the horizontal direction through the ball group holds to move together, tripartite plane between the upper and lower base and the retainer Guide means for guiding relative movement in the horizontal direction without changing the visual posture, and the rolling surface of each ball is a concave curved surface so that it returns to its original position even if the upper and lower bases move relative to each other. Or it forms in a conical surface.
[0010]
Each of the upper and lower bases has a pair of rectangular support plates each having a single ball interposed therebetween, and the vertical direction in a plan view so that one corner portion of each of the support plates is located closer to the corner portion of the base. The guide means are arranged symmetrically with respect to the lateral direction, and are spaced between the support plates adjacent in the vertical direction and the support plates adjacent in the horizontal direction in plan view, respectively . There are four runners that move horizontally relative to both the base and the retainer . These four runners are located in two parts between the support plates that are adjacent to each other in the vertical direction in plan view and in the lateral direction. One piece is disposed at each of two portions between the support plates adjacent to each other.
[0011]
And in either Tonaria' it was provided freely travel each runner to a fixed guide member disposed on the support plates, or has fitted freely traveling runners in the guide grooves formed in the support plate Tonaria', further, wherein each runner, the retainer, relative movement direction of the runner with respect to the retainer is mounted so as to be perpendicular to a relative movement direction in a plan view of the runner relative to the base.
[0012]
According to the invention of claim 2, in addition to the invention of claim 1, there is further provided a resistance means for making the runner difficult to move relative to the base and / or the retainer. As the resistance means, one using a viscous fluid or one using a friction material can be used, and an optimum one may be selected according to the weight of the seismic isolation object.
[0013]
The resistance means may be received separately from the guide means.
[0014]
[Action / Effect]
According to the present invention, yet immune Shindai of Ru by relatively moving the upper and lower base in a horizontal direction through the ball from the vertical during earthquakes based is guided for linear movement, in other words, HimenShinbutsu because only relative movement along a simple linear direction from the lower base and can improve the stability of the upper base and Himen Shinbutsu. Therefore, the seismic isolation function can be improved without impairing the advantages of using the ball.
[0015]
By the way, when the upper and lower base is too relative motion at too light force, thus moving the seismic isolation products in only at the time of normal people or leaning against things to Himen Shinbutsu (non-earthquake) is or press lightly problem and, there is a problem that in the shaking of an earthquake the upper and lower base resulting in resonance, which is not preferable. In this respect, when configured as claim 2, since the upper and lower base is relative motion with a light force is prevented or suppressed by using a guide means, easily moving Himen Shinbutsu with a light force during normal And the problem that the seismic isolation object falls due to resonance can be prevented or improved without excessively complicating the structure.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0017]
<< First Embodiment >>
1 to 11 show a first embodiment. The present embodiment is applied to a seismic isolation table for a large or medium display case installed in a museum, art gallery, or store, and FIG. 1 shows a state where the display case 1 is placed.
[0018]
FIG. 2 is an exploded perspective view schematically showing the base isolation table 2. The base isolation table 2 includes a lower base 3 installed on the floor F, an upper base 4 to which the display case 1 is attached, and both 3, 4 And a runner 6 for maintaining the posture of the retainer 5. Details will be described below.
[0019]
3 is a bottom view of the upper base 4, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line VV in FIG. 3, as shown in FIGS. The upper base 4 includes a main frame 4a formed in a rectangular shape with a U-shaped steel material having a downward cross-section and a center frame 4b extending in a cross shape in plan view, and is surrounded by the main frame 4a and the center frame 4b. The upper support plate 8 made of stainless steel or the like is fixed to the four locations via the upper spacer plate 7, and each upper support plate 8 is formed with the upper rolling portion 9.
[0020]
The lower surface of the upper support plate 8 is formed flat (may be a downwardly concave curved surface or a conical surface). The main frame 4a of the upper base 4 has a hole 10 for fixing the display case 1 with a screw.
[0021]
Next, the lower base 3, the retainer 5, and the like will be described with reference to FIGS. 6 is a plan view with the upper base 4 removed, FIG. 7 is a cross-sectional view showing a state in which the ball 11 is attached to the retainer 5, and FIG. 8A shows the relationship between the runner 6 and the lower base 3. (B) is a BB plane sectional view of (A), (C) is a CC sectional plan view of (A), (D) is a sectional view of DD of (A), and FIG. IX-IX partial sectional view, FIG. 10 is an enlarged view of a main part.
[0022]
Similarly to the upper base 4, the lower base 3 also includes a main frame 3a made of a steel material having an upward U-shaped cross section and a cross-shaped center frame 3b, and the frames 3a and 3b are opened upward. Moreover, as shown in FIG. 6, the main frame 3a has a hole 12 for fixing to the floor with an anchor or the like.
[0023]
Then, the four sites surrounded by the main frame 3a and the center frame 3b, via the lower spacer plates 13 respectively secured to the lower support plate 14 of stainless steel or the like, thereby, the upper rolling unit 9 Four corresponding lower rolling portions 15 are formed. For example, as shown in FIG. 9, the upper surface of the lower support plate 14 is formed with a curved surface 14a that is loosely curved upward and concave as an example of a return means for returning the upper and lower bases 3 and 4 to their original positions. A ball 11 such as a steel ball is interposed between the plates 8 and 14.
[0024]
Each ball 11 is integrally held by a retainer 5. The retainer 5 includes a rectangular frame body 5a made of a steel material having a U-shaped cross section and a bearing receiver 5b fixed to a corner portion of the frame body 5a. The ball receivers 16 and 17 are fixed by screws 18, and the ball 11 is rotatably held by the upper and lower ball receivers 16 and 17 so that they cannot be removed.
[0025]
The ball 11 is set so as to be exposed vertically from the upper and lower ball receivers 16, 17. In this case, for example, as shown in FIG. 7, the upper ball receiver 16 is in close contact with the upper support plate 8 of the upper base 4. By forming a contact portion 16a to be obtained and providing a slight gap between the inner surface of the upper and lower ball receivers 16 and 17 and the ball 11, the ball 11 and the ball receivers 16 and 17 are relatively moved in the vertical direction. Set to get. At least the upper ball receiver 16 is made of a synthetic resin having a high frictional resistance such as a POM resin.
[0026]
Note that the contact portion 16a may be configured separately from the upper ball receiver 16, and only the contact portion 16a may be manufactured from a material having a high frictional resistance such as POM resin.
[0027]
For example, as clearly shown in FIG. 8, the four parts of the center frame 3 b of the lower base 3 sandwiched between the adjacent lower support plates 14 are directed upward as part of the resistance means recited in the claims. An upwardly-opening U-shaped fixed guide body 20 which is a part of the guide means described in the claims is fixed to the bottom surface of the flange member 19. A bracket 21 is fixed to the side surface of the flange member 19 by welding or the like, and the bracket 22 is fixed to the lower spacer 13 with a screw 22.
[0028]
An appropriate amount of fluid (viscous fluid) 23 having a high viscosity such as silicone resin is placed in the gap between the inner surface of the flange member 19 and the outer surface of the fixed guide body 20 (also inside the fixed guide body 20). It is possible to fill the viscous fluid 23). As shown in FIG. 6, both ends of the flange member 19 are closed by end plates 24.
[0029]
Next, the structure of the runner 6 will be described. As shown in the respective drawings of FIG. 8, the runner 6 includes a rectangular head 25 that is inserted into the frame 5 a of the retainer 5 and a rectangular body that is fixed to the lower surface of the head 25 with screws. 26, a square tube 27 fitted to the body 26 so as to be vertically slidable from below, and a resistor 28 having a U-shaped cross-section that is fixed to the height portion of the square tube 27 in the vertical direction.
[0030]
The lower end of the rectangular tube 27 is closed with a bottom plate 27a, and a slider 29 made of synthetic resin is attached to the bottom plate 27a in order to make the sliding with the fixed guide body 20 smooth. Further, a spring 30 for urging the body 26 upward is disposed inside the rectangular tube 27.
[0031]
As shown in FIG. 10, the side plate of the resistor 28 is set so as to be positioned between the inner side surface of the flange member 19 and the outer side surface of the fixed guide body 20. In other words, a slight gap is set between the side plate of the resistor 28 and the inner side surface of the flange member 19 and the outer side surface of the fixed guide body 20.
[0032]
Four rollers 31 are attached to the head 25 of the runner 6 so as to be able to roll on the inner surface of the frame body 5a of the retainer 5 so as to be freely rotatable. The frame body of the retainer 5 is mounted on the upper surface of the head 25. An upper slider 32 made of synthetic resin that hits the ceiling surface of 5a is provided.
[0033]
Although not shown in the figure, there are provided restricting means for preventing the upper and lower bases 3 and 4 from excessively moving relative to each other. As the restricting means, for example, a stopper that restricts the movement of the runner 6 is provided on the flange member 19 or the fixed guide body 20 of the lower base 3, or a member that directly restricts the movement range of the retainer 5 is used as the lower base 3. Various structures can be employed, such as providing a circular ring (frame) in plan view that isomerizes the moving range of the ball 11 on the lower rolling portion 15.
[0034]
In the above configuration, by a spring 30 which is a built in the runner 6 retainer 5 is urged upward in four portions, Thus, four abutting portions 16a are upper rolling portion 9 in the retainer 5 (on the supporting plate 8) is a strong hit. The contact portion 16a of the retainer 5 has a large frictional resistance, and the resistance body 21 of each runner 6 is immersed in the viscous fluid 23 and is difficult to move, so that even if some external force acts on the display case 1. It does not move easily. For this reason, it can prevent that the display case 1 moves with a light force in normal times.
[0035]
On the other hand, when an earthquake occurs and the floor is shaken, the display case 1 and the upper base 4 are stationary due to inertia, and the lower base 3 moves together with the floor F, so that the display case 1 is seismically isolated. The Since the energy due to the shaking of the earthquake is large, when the floor is shaken, the retainer 5 and the upper base 4 move relative to each other in a state where the contact portion 16a of the retainer 5 is in contact with the upper rolling portion 9. Further, the display case 1 and the upper base 4 are not completely stationary, and generally move to follow the lower base 3 to some extent.
[0036]
Each runner 6 is movable along the longitudinal direction of the frame body 5a of the retainer 5 and is movable along the fixed guide body 20 of the lower base 3, that is, the retainer 5 is viewed in a plan view. The upper and lower bases 3 and 4 are allowed to move relative to each other in any direction because they can move freely in the X direction and the Y direction, and are restricted by the runners 6 so that the attitude of the retainer 5 with respect to the lower base 3 Does not change.
[0037]
In this way, since the retainer 5 moves with the posture kept constant, even if an external force that causes the lower base 3 to turn horizontally is applied, the retainer 5 and the lower base 3 are shown in FIG. As shown in FIG. 1, the display case 1 is moved horizontally in the linear direction. Therefore, the stability of the display case 1 can be improved and the seismic isolation function can be improved. Since between the upper base 4 and the retainer 5 are guide means for holding the relative posture is not interposed, the upper base 4 to move down the base 3 in the opposite direction across the retainer 5, the retainer When 5 is relatively moved in the linear direction, the upper base 4 is also moved in the linear direction. For this reason, the posture of the upper base 4 is also kept constant.
[0038]
When the viscous fluid 23 as in the embodiment is used as the resistance means, the number of the resistors 28 can be arbitrarily set as necessary (the movable resistor 28 and the fixed resistor plate provided on the flange member 19 are connected to each other). It may be configured to engage in a comb-teeth shape). Further, instead of the viscous fluid 23, a friction plate may be used, or the friction plate and the viscous fluid 23 may be used in combination.
[0039]
Since the viscosity of the viscous fluid 23 increases as the moving speed of the resistor 28 increases, there is an advantage that the upper and lower bases 3 and 4 can be prevented from resonating when greatly shaken.
[0040]
As in the embodiment, in addition to the resistance means using the viscous fluid 23 or the like, if the retainer 5 is provided with the contact portion 16a (friction resistor) that contacts the upper base 4, the display case 1 easily moves in normal times. In this case, if the upper rolling part 9 is formed flat as in the embodiment, the abutting part 16a is moved to the upper rolling part 9 ( There is an advantage that the smooth relative movement of the upper and lower bases 3, 4 is not impaired because the upper support plate 8) hits uniformly without hitting.
[0041]
<< Second Embodiment >>
12 to 15 show the second embodiment, FIG. 12 is a front view, FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12, FIG. 14 is a sectional view taken along line XIV-XIV in FIG. FIG.
[0042]
In this embodiment, the retainer 5 is held in a posture with respect to the upper and lower bases 3 and 4. In this embodiment, the frame 5a in the retainer 5 is formed in a state of being opened up and down with the grooved steels back to back, and the runner 6 provided with four rollers 36 in the upper and lower guide grooves 35 in the frame 5a. Each of the upper and lower runners 6 is movably fitted, and four rollers 38 are attached to each of the upper and lower runners 6 so as to be in contact with the inner side surfaces of the guide grooves 37 formed on the upper and lower bases 3 and 4.
[0043]
In this embodiment, as shown in FIG. 15, the retainer 5 and the lower base 3 are held in posture via four lower runners 6, and the retainer 5 and the upper base 4 are interposed via four upper runners 6. Hold the posture. Although not shown in the drawing, also in the second embodiment, resistance means for suppressing relative movement between the retainer 5 and the lower base 3 and / or the retainer 5 and the upper base 4 may be provided.
[0044]
≪Others≫
The present invention can be embodied in various ways other than the above forms. For example, the guide means is not limited to the embodiments described above, and various guide mechanisms can be used. Moreover, the seismic isolation table of this application is applicable not only to a display case but to various things, such as a cabinet, various facilities, apparatus, fixtures, a building, etc. The upper base is may be provided integrally with the Himen Shinbutsu (i.e., may form an upper base bottom of HimenShinbutsu).
[Brief description of the drawings]
FIG. 1 is a perspective view in a state where a display case is placed on a base isolation table.
FIG. 2 is an exploded perspective view of a base isolation table.
FIG. 3 is a bottom view of the upper base.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
5 is a cross-sectional view taken along the line VV of FIG.
FIG. 6 is a plan view of a retainer and a lower base.
FIG. 7 is a cross-sectional view of a main part of the retainer.
FIG. 8 is a diagram showing a relationship between an upper and lower base and a retainer.
FIG. 9 is a partial cross-sectional view of the base isolation table.
FIG. 10 is a cross-sectional view of a main part.
FIG. 11 is a plan view showing an operation.
FIG. 12 is a cross-sectional view of a second embodiment.
13 is a cross-sectional view taken along line XIII-XIII in FIG.
14 is a cross-sectional view taken along line XIV-XIV in FIG. 13;
FIG. 15 is a diagram illustrating an operation of the second embodiment.
FIG. 16 is a plan view showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Display case as an example of a to-be-isolated object 2 Seismic isolation base 3 Lower base 4 Upper base 5 Retainer 6 Runner 9 Upper rolling part 11 Ball 15 Lower rolling part 16, 17 Ball rest 19 Jade member 20 Fixed guide body 23 Viscous fluid 28 Resistor 30 Spring 31 Roller
37 Guide groove

Claims (2)

An upper and lower base of a rectangular shape in plan view arranged so as to overlap in plan view;
Four balls that are freely rollable between the upper and lower bases so that the upper and lower bases can move relative to each other in plan view ;
A retainer ball before Symbol 4 when the upper and lower base relative movement in the horizontal direction through the ball group holds to move together,
A guide means for guiding the upper and lower bases and the retainer to move relative to each other in the horizontal direction without changing the posture in plan view;
A base-isolated table in which the rolling surface of each ball is formed in a concave curved surface or a conical surface so that it returns to its original position even if the upper and lower bases move relative to each other ,
Each of the upper and lower bases has a pair of rectangular support plates each having a single ball interposed therebetween, and the vertical direction in a plan view so that one corner portion of each of the support plates is located closer to the corner portion of the base. While arranged symmetrically with respect to the lateral direction, and there is a gap between the support plates adjacent in the vertical direction and the support plates adjacent in the horizontal direction in plan view, respectively,
The guide means includes four runners that move in a horizontal direction relative to both the base and the retainer, and these four runners are provided at two positions between support plates adjacent in the vertical direction in plan view. And one each at the two parts between the support plate adjacent in the lateral direction,
A runner is provided on each of the fixed guide bodies arranged between the adjacent support plates so that they can run freely, or the runners are fitted in the guide grooves formed by the adjacent support plates,
Further, the each runner, the retainer, relative movement direction of the runner with respect to the retainer is mounted so as to be perpendicular to a relative movement direction in a plan view of the runner with respect to the base,
Base isolated. Furthermore, resistance means for making the runner difficult to move relative to the base or the retainer or both is provided.
The base isolation table according to claim 1.

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