JPH09173171A - Base isolation mechanism for preventing overturn of storing furniture or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope even with an earthquake generating a vibration of large amplitude, and provide a high base isolation effect without preventing relative displacement generated upon the occurrence of an earthquake. SOLUTION: A frame body 20 fixed to the lower side of storing furniture is placed on the upper surface of a floor plate 10 via a low frictional member 30, and a total of four tension sprints 40 consisting of a pair of right and left springs and another pair of back and front springs is provided between a hook 14 fitted to the center of the floor plate 10 and the cross rail 22 of the frame body 20. Furthermore, a distance between the joints of the right and left tension springs 40 to the cross rail 22 is set at a value two times or more of the free length of the spring 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention mechanism for preventing fall of furniture by allowing relative movement with respect to an installation floor surface in the event of an earthquake.

[0002]

2. Description of the Related Art There is a device disclosed in Japanese Utility Model Publication No. 3-50769 as a device for preventing falling of stored furniture in the event of an earthquake.

As shown in the plan view of the relevant portion in FIG. 7, this is mounted on the floor plate 71 which is horizontally fixed on the floor and the mounting frame 7 is mounted on the floor plate 71.
The storage furniture is fixed via the floor board 71 and the mounting frame 72.
Is connected via a tension spring 73 and an oil damper 74.

The mounting frame 72 is provided with rollers 72A along its left and right short sides, respectively, so as to be movable in the direction along the short sides with respect to the floor plate 71, and the tension spring 73 and the oil damper 74 are It is provided parallel to this movable direction.

The tension springs 73 are respectively tensioned between the attachment plate 71A provided at the center of the floor plate 71 and the long front and rear sides of the attachment frame 72, and the pair of tension springs 73 are provided.
Are set so that the attachment frames 72 are pulled in the opposite directions by the same force in opposite directions and the biasing forces are balanced.

The oil damper 74 is installed between the long sides of the floor plate 71 and the mounting frame 72, and the floor plate 71 and the mounting frame 7 are provided.
Resistance is given to the relative displacement of 2.

In the above structure, since the floor plate 71 and the mounting frame 72 can move relative to each other in the short side direction, even if the floor plate 71 vibrates in the horizontal direction due to an earthquake, the mounting frame 72 will not move.
It does not shake due to its relative movement, preventing the furniture from falling over. The tension spring 73 acts to return the floor plate 71 and the mounting frame 72 (that is, the stored furniture) that move relative to each other to a predetermined positional relationship, and the oil damper 74 reduces the relative displacement amount of the mounting frame 72 and the floor plate 71 (the amplitude is reduced). Is expected to act).

[0008]

However, in the above-mentioned conventional structure, the mounting plate 71A provided at the center of the floor plate 71 is used.
Since the tension springs 73 are provided on both the front and rear sides so as to urge each other in opposite directions, the relative displacement amount of the floor plate 71 and the mounting frame 72 is restricted by the tension spring 73 on the moving side. There was a problem that a large amplitude vibration could not be tolerated.

That is, the tension spring 73 has a length of 1/2 or less in the relative displacement direction at the time of initial setting, and the tension spring 73 on the side contracted by the relative displacement of the floor plate 71 and the mounting frame 72 has its free length. Since it acts to prevent further displacement of the mounting frame 72 after contracting up to, the allowable relative displacement amount (amplitude) between the floor plate 71 and the mounting frame 72 is extremely small, and an earthquake with a large amplitude (that is, a large earthquake). ) Was not possible (the seismic isolation function disappears because the earthquake amplitude exceeds the relative displacement).

The oil damper 74 provided to reduce the amount of relative displacement acts so as to prevent relative displacement between the floor plate 71 and the mounting frame 72 at the time of occurrence of an earthquake (at the start of relative displacement), and has a seismic isolation function. It was something that would lower it.

The present invention has been made in order to solve the above-mentioned problems, and can accommodate a large-amplitude earthquake, and can provide a high seismic isolation effect without hindering relative displacement when an earthquake occurs. The purpose is to provide a seismic isolation mechanism that prevents furniture from falling over.

[0012]

A fall prevention seismic isolation mechanism for storage furniture and the like according to the present invention which achieves the above object, has a structure in which a storage furniture is guided through a low friction member on a substrate member having a guide member on the upper surface. While being slidably mounted along the member, the storage furniture is provided with a pair of urging means for urging the storage member against the substrate member in equal directions in opposite directions. In the urging means, tension spring members are obliquely stretched symmetrically at a predetermined angle between the plane center of the storage furniture or the board member portion and the board member or the storage furniture in a left-right symmetrical manner. The free length of the spring member is set to be equal to or less than ½ of the distance between the connecting portions of the left and right tension spring members to the storage furniture.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of storage furniture including a fall prevention seismic isolation mechanism for storage furniture according to the present invention,
FIG. 2 is a sectional view taken along the line AA.

The storage furniture 1 is placed on a floor plate 10 as a substrate member laid on the floor surface via a frame body 20, and the frame body 20 is short with respect to the floor plate 10 in its plane. The relative movement in the lateral direction prevents the fall due to an earthquake tremor. Incidentally, the reason why the relative movement in the short side direction is possible is that if the storage furniture 1 is tilted in that direction, the plane projection position of the center of gravity is outside the bottom surface and there is a high possibility of falling.

The floor plate 10 is a thin flat plate whose long side is substantially equal to the long side of the plane of the storage furniture 1 and whose short side is a predetermined amount (floor plate 10 and frame body from the short side of the plane of the storage furniture 1). 20 relative displacement allowance) is set to a large value. Guide fittings 11 as guide members are provided in the vicinity of both ends in the longitudinal direction of the upper surface, in parallel with the short side direction of the storage furniture 1.

As shown in FIG. 3 which is a sectional view taken along the line BB of FIG. 2, the guide fitting 11 has an L-shaped cross section and is welded and fixed to the upper surface of the floor plate 10 at one side thereof and is erected at the other side. The support fitting 11A is formed by fastening an integrated inner guide 12 having a J-shaped cross section and an outer guide 13 having a L-shaped cross section by welding. One side of the rail metal fitting 23 fixed to the frame body 20 is fitted between the inner guide 12 and the outer guide 13, and the inner guide 12
The inner side surface of the rail fitting 23 faces the outer side of the rail bracket 23, thereby guiding the relative movement of the frame body 20 with respect to the floor board 10. Sheets 23A, 23B, and 23C made of fluororesin are attached to the upper surface, the lower surface, and the inner side surface of the rail fitting 23 to reduce the resistance when the rail metal fitting 23 comes into contact with the outer guide 13 or the inner guide 12, respectively.

The frame 20 is formed by vertical and horizontal crosspieces 21 and 22 into a rectangular frame shape which is the same as the planar shape of the storage furniture 1.
On the inner surface of the vertical rail 21 that constitutes the short side, the rail bracket 2 described above is provided.
3 is provided over the entire length.

Further, low friction members 30 are provided at both ends of the vertical rail 21 (that is, four corners of the frame body 20), and the frame body 20 is placed on the floor plate 10 through the low friction members 30. By resisting the frictional force of the low friction member 30, it is possible to move in the short side direction guided by the guide fitting 11.

As shown in FIG. 3, the low friction member 30 has a head 31A of a bolt 31 screwed from the lower surface side to a nut 33 which is welded and fixed to the lower surface of a vertical crosspiece 21 having a hat-shaped cross section.
A low-friction material 32 formed in a columnar shape with a phenol resin, a polyacetal resin, an oil-containing sintered alloy, or the like is externally mounted and fixed, and its flat lower surface abuts on the upper surface of the floor board 10. As a result, the bolt 31 is rotated by utilizing the slit portion at the upper end of the bolt 31 to rotate the vertical bar 21 (nut 33).
The frame body 20 (that is, the storage furniture 1) can be horizontally adjusted according to the inclination of the floor plate 10 by adjusting the screwing amount to the.

Due to the construction of the floor plate 10 and the frame body 20 described above,
The frame 10 moves in the direction along the guide fitting 11 (that is, the short side direction) with respect to the floor plate 10 by the action of a horizontal force against the frictional force of the low friction member 30. The frictional force of the low-friction member 30 is the friction coefficient of the low-friction member 30 and the stored furniture 1.
Although it depends on the weight of the storage furniture 1, it is set to a minimum value that does not easily move when the storage furniture 1 is used.

A tension spring 40 serving as a tension spring member is stretched between the floor plate 10 and the frame body 20.

A pair of tension springs 40 are provided between the hook metal fitting 14 projecting in the center of the floor plate 10 and the horizontal rail 22 of the frame 10 in a front-rear direction at a predetermined angle in a pair of left and right (that is, a total of 4).
Book) is provided. The pulling forces of the pulling springs 40 are all equal, whereby the floor plate 10 is biased in opposite directions (front and back) with respect to the frame body 20 by the combined force of the pulling forces of the pair of left and right pulling springs 40. The bias is balanced.

The distance between the connecting portions of the left and right tension springs 40 to the horizontal rail 22 is at least twice the free length of the tension springs 40 (in other words, the tension springs 40).
The free length of is less than 1/2 of the joint interval).

In the above-mentioned structure, the floor plate 10 vibrates due to an earthquake and the horizontal acceleration in the short side direction of the floor plate 10 is low friction member 3.
When the frictional force is 0 or more, the floorboard 10 is displaced relative to the frame body 20 and the storage furniture 1 does not vibrate, whereby the storage furniture 1 is prevented from falling. That is, the fall of furniture or the like due to an earthquake occurs when only the lower part moves and the upper part is left behind and tilts due to the vibration of the ground contact surface, and the bottom surface projected position of the center of gravity goes out of the bottom surface. Although 10 vibrates due to an earthquake motion, the frame 20 (storage furniture 1) remains stationary, so that the storage furniture 1 can be prevented from falling.

At the start of the relative displacement of the tension springs 40, the urging forces of the floor plate 10 and the frame 20 in the relative displacement directions (front and rear) are balanced, and the tension springs 40 act to suppress the relative displacement. However, the relative displacement between the floor plate 10 and the frame body 20 gradually increases and acts to return the positional relationship between the floor plate 10 and the frame body 20 to the initial state.

Here, a pair of left and right tension springs 4
0 is parallel to the horizontal rail 22 as shown in FIG. 4, because the interval of the connecting portion of the frame body 20 to the horizontal rail 22 is set to be twice the free length of the tension spring 40 as described above. Can be As a result, the relative displacement between the floor plate 10 and the frame body 20 is set to allow up to 1/2 of the short side (vertical bar 21) of the frame body 20 (that is, until the hook fitting 14 and the horizontal bar 22 interfere with each other). It is possible to obtain a large relative displacement allowable amount (that is, an allowable amplitude).

The arrangement structure of the tension spring 40 is reversed between the floor plate 10 and the frame body 20 (a hook metal fitting is provided at the center of the frame body 10 and the other end of the tension spring 40 is fixed to the long side portion of the floor plate 10). Yes) is also good.

5 and 6 show a structure of the low friction member 50 different from the above. This is to movably support the frame body 20 by the roller 51 to which a predetermined rotation resistance is added by friction. In the figure, the same components as those described above are designated by the same reference numerals.

The roller 51 is made of polyacetal resin or oil-containing sintered alloy and is rotatably supported by a pin 53 between roller holders 52 having an inverted U-shaped cross section. A disc spring 54 is interposed between the inner surface of the roller holder 52 and the side end surface of the roller 51.
The biasing pressure of the disc spring 54 causes the roller 51 to rotate with a predetermined frictional resistance.

A nut 55 is welded and fixed to the upper surface of the roller holder 52, and a small-diameter fitting portion 56A at the upper end of a bolt 56 which is screwed into the nut 55 has a secondary holder 5.
7, the E-ring 58 is fitted in the upper protruding portion, and the bolt 56 cannot be removed from the secondary holder 57. At the upper end of the bolt 56, a slit 56B for rotating operation by a driver is formed.

The secondary holder 57 is formed by bending a flat plate into a shape in which both ends of the hat type are bent at a right angle toward the lower side, and is fixed to the upper surface of the roller holder 52 in the upward protruding portion of the hat type. The nut 55 is accommodated, the left and right horizontal parts thereof are placed on the upper surface of the roller holder 52, and the vertical edges 57B at both ends are further arranged on the roller holder 52.
It is fitted between the left and right side plates 52A.

The upper projecting portion 57A of the secondary holder 57 is fitted into the notch 21A formed in the vertical bar 21 of the frame body 20 and welded, so that the secondary holder 57 is opposed to the frame body 20. It is fixed so that it cannot be moved.

According to this structure, a predetermined resistance can be added to the movement of the frame 20 with respect to the floor plate 10 due to the rotational frictional resistance of the roller 51. Depending on the use of the storage furniture 1, the floor plate may be used as in the above-described example. It can be set so that the frame body 20 does not move with respect to 10, and is relatively displaced by the action of a predetermined horizontal acceleration.

Further, by rotating the tip of the bolt 56 projecting from the upper surface of the secondary holder 57, the nut 5
The vertical position of the roller holder 52 with respect to the secondary holder 57 changes due to the change of the screwing position of the roller holder 5 and the horizontal adjustment of the frame 20.

[0035]

As described above, according to the fall-prevention seismic isolation mechanism for storage furniture according to the present invention, the pair of biasing means biases the storage furniture in opposite directions in the moving direction with equal force. By doing so, the relative displacement at the start of vibration when an earthquake occurs is not hindered, and the biasing means is such that the tension spring members are diagonally stretched symmetrically at a predetermined angle in a left-right pair and the tension spring members are free to move freely. Since the length is set to 1/2 or less of the interval between the connecting portions of the left and right extension spring members to the storage furniture, the relative displacement of the extension furniture on the contraction side with respect to the floor plate of the storage furniture becomes perpendicular to the displacement direction. Can be tolerated, and large relative displacement is possible, so that an earthquake with a large amplitude can be dealt with.

[Brief description of the drawings]

FIG. 1 is a perspective view of storage furniture provided with a fall prevention seismic isolation mechanism for storage furniture according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a diagram showing a state where the frame body is relatively displaced with respect to the floor plate from the state of FIG.

FIG. 5 is a sectional view corresponding to FIG. 3, showing another configuration of the low-friction member.

FIG. 6 is a view as viewed in the direction of arrow C in FIG. 5;

FIG. 7 is a diagram showing a seismic isolation mechanism as a conventional example.

[Explanation of symbols]

 1 Storage Furniture 10 Floor Board (Substrate Member) 30 Low Friction Member 40 Tensile Spring (Tension Spring Member) 50 Low Friction Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeru Shimosaka Inventor Shigeru Shimosaka 3-15-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center (72) Inventor Yusuke Mori 3-chome, Toyosu, Koto-ku, Tokyo No. 1-15 Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center (72) Inventor Akihiro Kashiwazaki 1 Shinshinarahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Technical Research Institute

Claims (1)

[Claims] 1. A storage furniture is mounted on a board member having a guide member on its upper surface so as to be slidable along the guide member via a low friction member, and the storage furniture is mounted on the board member. On the other hand, a pair of urging means for urging the moving direction in the opposite directions with equal force are provided, and the urging means includes a plane center of the storage furniture or the board member portion, and the board member or A tension spring member is diagonally stretched at a predetermined angle in a symmetrical manner between the storage furniture and the storage furniture.
The fall prevention seismic isolation mechanism for storage furniture or the like, wherein a free length of the tension spring member is set to be 1/2 or less of an interval of a connecting portion of the left and right tension spring members to the storage furniture.