JP4095052B2 - Furniture base isolation table - Google Patents

Description

  The present invention is a furniture base for placing furniture to prevent the furniture from falling over in the event of an earthquake, in particular intervening between the furniture and the floor surface, so that vibration due to the earthquake on the floor surface is not directly transmitted, The present invention relates to a base isolated from which furniture can be moved laterally relative to the floor.

  The basic structure of the base isolation table for furniture includes a floor-side member (base portion) fixed or installed on the floor surface, a member (mounting portion) for placing furniture, a base portion, and a placing portion. A moving part interposed so that both can move relative to each other, and a stopper mechanism part for preventing the movement from being performed for purposes other than seismic isolation such as furniture opening / closing operation and door opening / closing operation, And a damping mechanism that attenuates the movement (Patent Documents 1, 2, 3, and 4).

  Specifically, a configuration in which a rail and wheels are combined as a moving unit (Patent Documents 2 and 3) and a configuration in which a steel ball such as a bearing ball is used (Patent Document 1 and FIG. 4 in FIG. 13) are known. .

  Furthermore, as the stopper mechanism, a structure based on magnetic attraction and release of an electromagnetic valve whose operation is controlled by a vibration sensor (Patent Document 1 and FIG. 5), and a structure that employs a locking portion biased by a ridge (Patent Document 2 and FIG. 6). 3 and 10) are known.

  Moreover, as a damping mechanism part, the damping structure (patent document 1) by the furniture's own weight which made the steel ball moving surface the bowl-shaped surface, and the structure (patent documents 2, 3) which arrange | positioned the opposite ridge are known.

  Although not provided with a damping structure, Patent Document 4 discloses a stopper for limiting the maximum amplitude.

Japanese Patent Laid-Open No. 9-296847. Japanese Patent Application Laid-Open No. 11-141603. Japanese Patent Application Laid-Open No. 11-262421. JP-A-11-262422.

  In the conventional moving part structure described above, the moving direction (isolation direction) is specified in the combination configuration of the rail and the wheel. In addition, the method of adopting a single steel ball at each corner requires a sufficient size because all the weight of the furniture is added to the steel ball, thereby causing a problem that the total height of the base is increased and resistance is increased. Friction also increases.

  The stopper mechanism may be a simple structure that can release the stopper function when a predetermined vibration force (external force) is applied, and it does not cause frequent earthquakes that may cause furniture to fall down. The use of sensors and striated elements can be said to be excessive quality.

  Furthermore, when the configuration in which the opposing ridges are arranged is adopted as the damping mechanism portion, there is no problem with the extending ridges, but the opposing ridges are shortened from the normal state (the state where no external force is acting). If the shortening is not made smoothly, the damping action is lowered.

  Therefore, the present invention proposes a novel furniture base for vibration isolation that efficiently absorbs vibration in all directions and includes a low-cost stopper mechanism.

The base isolation table for furniture according to the present invention has a base portion fixed or installed on the floor surface, and a wall surface surrounding the appropriate range on the upper surface of the base portion, and a large number of through holes in a circular small circular plate. And a moving body fitted with a bearing ball having a size slightly projecting from the height of the wall surface into the through hole escapes to the other remaining range even if it collides with each other inside the wall surface. A plurality of moving parts arranged as possible, and a size that occupies a range equal to or greater than the surrounding range of the wall surface, and is placed on a bearing ball of the moving part and is relative to the base part A mounting portion provided so as to be movable, a stopper portion fixedly interposed between the base portion and the mounting portion with a support rod that breaks when a predetermined lateral shearing force is applied , a base portion and a mounting portion And an attenuation mechanism for attenuating the relative movement operation. To do.

  Thus, the furniture base is installed on the floor, and the furniture is placed on the placement part. Normally, the base part and the placement part are integrated (horizontal direction) by the stopper part. Therefore, the furniture is not shaken by the operation of the drawer or the door, and the operation is not hindered.

  When a large earthquake occurs, the floor of the house rolls along with the earthquake, but the furniture maintains its stopped state due to inertial force. Therefore, if the horizontal stress between the roll of the base due to the earthquake and the mounting portion receiving the inertial force of the furniture exceeds the durability of the stopper, the support rod breaks. Since the mounting part can move freely and relatively with respect to the base part due to the breakage of the support bar, the rolling due to the earthquake is not transmitted to the furniture by the relative lateral movement of the mounting part, Lodging is prevented.

  Further, the present invention (Claim 2), particularly in the base isolation table, includes a support plate on which the mounting portion is mounted on a bearing ball and a mounting plate on which furniture is mounted. It is formed by connecting and fixing with a small disk between the mounting plate and adopting a plurality of tension ridges interposed in the damping mechanism portion so as to oppose the vicinity of the outer periphery of the small disk and the base portion. The small disk side connecting and fixing part is provided by being shifted from the linear position between the small disk center and the base part connecting and fixing part.

  Therefore, the support bar breaks, and the mounting portion can be freely moved laterally. When the relative position of the base portion and the mounting portion is greatly shifted, a part of the ridges are extended along with the opposing portions. While the ridge on the side remains in an unstretched state, the distance between the connecting and fixing portions at both ends of the ridge becomes short, but the connecting portions are deviated (the ridge is positioned on a straight line between the center of the small disk and the connecting and fixing portion of the base portion Therefore, even if the distance is shortened, it will bend more in the direction in which it is bent, and a smooth damping action will be achieved without causing any trouble.

  Since the apparatus of the present invention supports the furniture with a large number of bearing balls as described above, it can cope with all directions, and since the overload of each bearing ball is distributed, the rolling friction resistance is small, and the earthquake The vibration absorption is efficiently performed, and the stopper mechanism is simplified by adopting the stopper portion having a breakage configuration, so that the cost of the apparatus can be reduced.

  Next, an embodiment of the seismic isolation device for furniture according to the present invention will be described. The seismic isolation device of the embodiment includes a base portion 1, a moving portion 2, a placement portion 3, a stopper portion 4, and a damping mechanism portion 5.

  The base portion 1 is a disc having an appropriate size (diameter of about 20 to 35 cm), and a peripheral wall 11 is formed on the outer periphery, and a urethane layer or a rubber layer cushion portion 12 is provided on the inner peripheral surface of the peripheral wall 11. .

The moving part 2 has a wall surface 21 projecting on the upper surface of the base part 1 so as to surround an appropriate center range (a range of about a half of the diameter), and a plurality of moving bodies 22 are arranged inside the wall surface. is there. The moving body 22 has a plurality of through holes formed in a circular small circular plate 23 and a bearing ball 24 fitted into the through hole. The diameter of the bearing ball 24 is higher than the height of the wall surface 21. The size is lower than the height of the peripheral wall 11 of the base portion 1.

  The mounting portion 3 includes a lower support plate 31, an upper mounting plate 32, and a small disk 33 that connects and fixes the support plate 31 and the mounting plate 32. The support plate 31 is moved as described above. It is placed on the body 22 and has a size that occupies the same or larger range as the wall surface 21, and the placing plate 32 is the same as or larger than the support plate 31.

  The stopper portion 4 is a rod made of wood, metal or resin, and is provided with a constriction or a notch so as to be easily broken when a predetermined lateral shear force is applied in advance. The base portion 1 and the mounting portion 3 It is fixedly interposed between the two. Further, the fixing means is provided with a receiving portion (insertion hole for the stopper rod 4) 41 in the base portion 1, an insertion hole 42 in the mounting plate 32, and the stopper rod 4 from the insertion hole 42 from above. What is necessary is just to insert even the receiving part 41.

  The damping mechanism section 5 radiates 3 to 5 pulling radii between the connecting section 51 provided on the peripheral wall 11 of the base section 1 and the connecting screw holes 52 on the side surface of the small disk 33 of the mounting section 3. In particular, the ridges are provided so as to tie a position shifted from a line connecting the connecting portion 51 of the peripheral wall 11 and the center of the instrument (center of the small disk 33). That is, when the ridge is positioned in the diameter direction, the ridge is provided so as to be bent.

  Thus, the furniture base is installed on the floor A of the building, and the furniture B is placed on the placing plate 32 of the placing portion 3 and used in a normal state. Since the base part 1 and the mounting part 3 are connected and fixed by 4, the seismic isolation function is not exhibited even if the furniture is slightly shaken by the furniture pull-out operation or the door operation. (Fig. 2a)

  When a large earthquake occurs, the floor A of the house shakes greatly, and there is a risk of furniture falling down, the stopper part 4 breaks, and even if the house floor A shakes, the furniture B is free with the mounting part 3 The furniture B can be prevented from falling down. (Fig. 2 b)

  In particular, the mounting portion 3 is supported by a plurality of moving bodies 22, the moving bodies 22 can arbitrarily move inside the wall surface 21, and even if the small discs 23 collide with each other, they escape. Since it is always possible to move freely (because it is not meshed and fixed), the shaking of the floor surface A is reliably prevented from being transmitted to the furniture B side. (Fig. 3 b)

  In addition, when relative movement between the base portion 1 and the mounting portion 3 occurs, the relative rolling is attenuated by the damping mechanism portion 5, but a part of the striation (damping mechanism portion) 5 is in the extended state. In this case, the ridge facing the elongated ridge will bend, and since it is provided in advance so as to bend easily, the dam itself does not hinder the damping action. If the ridges are provided in the diametrical direction and in the four directions, the tensile ridges remain as they are, and as a result, no damping action is performed. The problem is solved by providing the arrangement of the ridges in advance so as to be easily bent.

  Further, when the height of the support plate 31 is set lower than the peripheral wall 11 so that the support plate 31 does not deviate from the range of the moving part 2 and the furniture B has a large vibration, the support plate 31 collides with the cushion part 12. Therefore, even if the stopper bar 4 breaks after the earthquake and the furniture B can be easily moved laterally by an external force, the furniture B should not be moved greatly by the collision. ing. Furthermore, since the broken stopper rod 4 can be easily replaced, it can be easily reused.

The disassembled perspective view of embodiment of this invention. In the cross-sectional view, (a) shows the normal state and (b) shows the state at the time of the earthquake. In the operation explanatory plan view of the moving body, (a) shows a normal state and (b) shows a state at the time of an earthquake. In the operation explanatory plan view of the damping mechanism section, (a) shows a normal state and (b) shows a state at the time of an earthquake.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base part 11 Perimeter wall 12 Cushion part 2 Moving part 21 Wall surface 22 Moving body 23 Small disk 24 Bearing ball | bowl 3 Mounting part 31 Supporting plate 32 Mounting board 33 Small disk 4 Stopper part (stopper bar)
41 Receiving part 42 Insertion hole 5 Damping mechanism part (Spring)
51 connecting part 52 connecting screw hole A floor B furniture

Claims (2)

A base portion which is fixed or placed on the floor, projecting a wall which surrounds the central appropriate range to the base portion upper surface, with bored a number of holes in a circular small disc, the wall surface in the through hole A plurality of moving parts that are fitted with bearing balls having a size slightly protruding from the height of the moving body are arranged on the inner side of the wall so that they can move to other remaining ranges even if they collide with each other. And a placing portion provided on the bearing ball of the moving portion so as to be movable relative to the base portion in a size that occupies a range equal to or greater than the surrounding range of the wall surface. A stopper that fixes a support rod that breaks when a predetermined lateral shear force is applied between the base portion and the mounting portion, and an attenuation that attenuates the relative movement between the base portion and the mounting portion. A base isolation table for furniture, comprising a mechanism part.   The mounting portion includes a support plate placed on the bearing ball and a placement plate on which furniture is placed, and is formed by connecting and fixing the support plate and the placement plate with a small disk, Adopting a plurality of pulling ridges that interpose the damping mechanism part in the vicinity of the outer periphery of the small disk and the base part, and connecting and fixing the small disk side of the pulling line to the center of the small disk and the base part. The base isolation table for furniture according to claim 1, wherein the base is shifted from a position on a straight line with the place.

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