JP2010025328A - Base isolation device with fall prevention structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation device with a fall prevention structure for preventing a base isolation function from being lost due to the fall of a part of the base isolation device when vibration or an aftershock by an earthquake occurs intermittently and the amplitude of the earthquake is increased. <P>SOLUTION: A plurality of downward recessed members are fixed to an upper member fixed to an upper structure. A plurality of upward recessed members 6 are fixed to a lower member 5 fixed to a foundation member. Rolling members 7 are interposed between the downward recessed members and the upward recessed members 6. Fall prevention sliding bolts 4 are interposed between an upper guide rail and a lower guide rail 8 fixed to the upper member and the lower member 5, respectively. The upper guide rail and the lower guide rail 8 cross each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to a seismic isolation device with a drop-off prevention structure, and in particular, vibrations and aftershocks due to earthquakes occur intermittently, and when the amplitude increases, a part of the seismic isolation device drops and the seismic isolation function is lost. The present invention relates to a seismic isolation device with a fall-off prevention structure.

  Conventionally, various seismic isolation devices have been developed, but most of them have a seismic isolation effect of springs and rubber, sliding method at the lower end, and rolling of the sphere for electronic devices on buildings and floors. There are many methods. For example, Japanese Patent Application Laid-Open No. 2007-24123 and Japanese Patent No. 3058364 have been developed.

  Japanese Patent Laid-Open No. 2007-24123   Japanese Patent No. 3058364

  Japanese Patent Laid-Open No. 2007-24123 has a structure in which a sphere can be freely rotated on a base for seismic isolation, and Japanese Patent No. 3058364 has a structure in which a bolt is screwed to the bottom of a casing of an electronic device. The body had a curved end and was slid on a concave tray.

  However, the sliding range of the amplitude is limited, and there is a problem that it becomes impossible to cope with a large amplitude.

  In Japanese Patent Application Laid-Open No. 2007-24123, since the sphere rolls in a narrow range, it is difficult to cope with the amplified amplitude when the object of use is a building such as a house.

  Moreover, since the said patent 3058364 is made into a leg by screwing a volt | bolt to the housing | casing bottom part of an electronic device, the flexibility of a leg was not easy and it was easy to be damaged.

  The problem of the seismic isolation device with the fall prevention structure according to the present invention is that the seismic isolation function is lost because a part of the seismic isolation device falls off when the vibration or aftershock due to the earthquake occurs intermittently and the amplitude increases. It is to provide a seismic isolation device with a drop-off prevention structure to prevent it in advance.

  A plurality of downward concave members are fixed to the upper member fixed to the upper structure, and a plurality of upward concave members are fixed to the lower member fixed to the base member. The downward concave member and the upward concave member A rolling member is interposed between the upper guide rail and the lower guide rail, and an upper guide rail is interposed between the upper guide rail and the lower guide rail. Provided is a seismic isolation device with a drop-off prevention structure, wherein a rail and a lower guide rail are arranged so as to cross each other. In addition, the sliding bolt is used for preventing the drop and the anti-resonance spring fitted to the sliding bolt has the effect of preventing resonance and the spring effect during vertical vibration.

  Further, the chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a free marble is attached to the inside of the chassis leg mounting C-shaped steel via a support, When the free marble is slidably abutted along a guide provided in an installation fixing portion inside the C-shaped steel for mounting the case leg, the front portion of the case is moved when the case receiving the vibration slides forward. Providing a seismic isolation device with a drop-off prevention structure that rises, the free marble stops at the stopper, and the center of gravity of the case moves backward to prevent the case from falling forward To do.

  Further, the case leg fixed to the case is fixed to the back of the case leg mounting C-shaped steel, and the ball bearing is attached to the inside of the case leg mounting C-type steel via a ball bearing holder, The ball bearing is rotatably abutted along a guide provided in an installation fixing portion inside the C-shaped steel for mounting the leg portion of the casing, and when the casing that receives vibration slides forward, Seismic isolation with a drop-off prevention structure, characterized in that the front part rises, the ball bearing stops at the stopper part, and the center of gravity of the case moves backward to prevent the case from falling forward Providing equipment.

  Also, the chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a free marble is attached to the inside of the chassis leg mounting C-shaped steel via a swing rubber. The free marble is slidably abutted along a guide provided in the installation fixing portion inside the C-shaped steel for mounting the leg portion of the case, and when the case receiving the vibration slides forward, the front of the case The drop-off prevention structure is characterized in that the part rises along the curved surface of the front guide, the free marble stops at the stopper part, and the center of gravity of the case moves backward to prevent the case from falling forward Provide seismic isolation devices.

  Also, the chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a free marble is attached to the inside of the chassis leg mounting C-shaped steel via a swing rubber. When the free marble is slidably abutted along the guides provided on the front and rear installation and fixing portions inside the C-shaped steel for mounting the leg portions of the case, the case receives the vibration and slides forward. The seismic isolation device with a drop-off prevention structure is configured such that the front part of the housing rises, the free marble stops at the stopper part, and the center of gravity of the housing moves backward to prevent the housing from falling forward I will provide a.

  In addition, the case leg fixed to the case is fixed to the back of the case leg mounting C-type steel, and a roller is attached to the inside of the case leg mounting C-type steel via a roller holder. Is pivotally abutted along guides provided on the front and rear installation and fixing portions inside the C-shaped steel for mounting the leg portions of the casing, and when the casing that receives the vibration slides forward, the front portion of the casing is A seismic isolation device with a drop-off prevention structure is provided, wherein the roller is raised and stopped at a stopper portion, and the center of gravity of the housing moves backward to prevent the housing from being moved forward.

  In addition, the case leg fixed to the case is fixed to the back of the case leg mounting C-type steel, and a roller is attached to the inside of the case leg mounting C-type steel via a roller holder. Is slidably abutted along guides provided on the front and rear installation fixing portions inside the C-shaped steel for mounting the case legs, and when the case receiving vibration slides forward, it follows the front guides. The front part of the chassis rises, the roller stops at the stopper, and the center of gravity of the chassis moves backward to prevent the chassis from falling forward. Provide a seismic device.

  In addition, the case leg fixed to the case is fixed to the back of the case leg mounting C-type steel, and a roller is attached to the inside of the case leg mounting C-type steel via a roller holder. Is slidably abutted along guides provided on the front and rear installation fixing portions inside the C-shaped steel for mounting the leg portion of the casing, and when the casing that receives vibration slides forward, the front portion of the casing is A seismic isolation device with a drop-off prevention structure is provided, which is configured to prevent the forward roller of the housing from moving forward by stopping the front roller at the stopper and moving the center of gravity of the housing to the rear. .

  In addition, the case leg fixed to the case is fixed to the back of the case leg mounting C-shaped steel, and a marble with a swing function is provided inside the case leg mounting C-type steel via a support portion. Mounting, the marble with swing function is slidably abutted along the guides provided in the front and rear installation fixing parts inside the C-shaped steel for mounting the leg of the casing, and the casing receiving the vibration is moved forward When sliding, the front part of the case rises, the marble with a swing function stops at the stopper part, and the center of gravity of the case moves backward to prevent the case from falling forward A seismic isolation device with a drop-off prevention structure is provided.

  The seismic isolation device with a fall prevention structure according to the present invention indicates that the seismic isolation function is lost because a part of the seismic isolation device falls off when the vibration and aftershocks occur intermittently and the amplitude increases. It can be prevented in advance.

  In addition, when vibrations or aftershocks due to earthquakes occur intermittently, the center of gravity of the housing of the vending machine or the like moves to the rear of the housing, which has an effect of preventing the housing from being moved forward.

Hereinafter, based on the Example shown in drawing, the seismic isolation apparatus with a drop-off prevention structure of this invention is demonstrated concretely. In the drawings, FIG. 1 is a plan view of an upper member of a seismic isolation device with a drop-off preventing structure according to the present invention. FIG. 2 is a plan view of the lower member of the seismic isolation device with a drop-off preventing structure according to the present invention. FIG. 3 is a perspective view of FIG. FIG. 4 is a side view of the seismic isolation device with a drop-off preventing structure according to the present invention. FIG. 5 is a side view of the seismic isolation device with a drop-off preventing structure according to the present invention at the time of swinging. FIG. 6 is a partial perspective view of the drop-off prevention structure. FIG. 7 is a partial cross-sectional view of the drop-off prevention structure. FIG. 8 is a partial cross-sectional view of the drop-off prevention structure. FIG. 9 is a partial cross-sectional view of the drop-off prevention structure. FIG. 10 is a partial cross-sectional view of the drop-off prevention structure. FIG. 11 is a partial side view of a seismic isolation device showing another embodiment installed in the lower part of the housing. 12 is a cross-sectional view taken along line AA of FIG. FIG. 13 is a partial side view when the housing of FIG. 11 moves forward. 14 is a cross-sectional view taken along line BB in FIG. FIG. 15 is a partial side view of a seismic isolation device showing another embodiment installed in the lower part of the housing. 16 is a cross-sectional view taken along line AA in FIG. FIG. 17 is a partial side view when the housing of FIG. 15 is moved forward. 18 is a cross-sectional view taken along line BB in FIG. FIG. 19 is a partial side view of the seismic isolation device showing another embodiment installed in the lower part of the housing. 20 is a cross-sectional view taken along line AA of FIG.
FIG. 21 is a partial side view when the housing of FIG. 19 is moved forward. 22 is a cross-sectional view taken along line BB in FIG. FIG. 23 is a partial side view of a seismic isolation device showing another embodiment installed in the lower part of the housing. 24 is a cross-sectional view taken along line AA of FIG. FIG. 25 is a partial side view when the housing of FIG. 23 moves forward. 26 is a cross-sectional view taken along the line BB in FIG. FIG. 27 is a partial side view of the seismic isolation device showing another embodiment installed in the lower part of the casing. 28 is a cross-sectional view taken along line AA in FIG. FIG. 29 is a partial side view when the housing of FIG. 27 is moved forward. 30 is a cross-sectional view taken along line BB in FIG. FIG. 31 is a partial side view of a seismic isolation device showing another embodiment installed in the lower part of the housing.
32 is a cross-sectional view taken along line AA of FIG. FIG. 33 is a partial side view when the housing of FIG. 31 moves forward. 34 is a cross-sectional view taken along line BB in FIG. FIG. 35 is a partial side view of the seismic isolation device showing another embodiment installed in the lower part of the casing. 36 is a cross-sectional view taken along line AA of FIG. FIG. 37 is a partial side view when the housing of FIG. 35 moves forward. 38 is a cross-sectional view taken along line BB in FIG. FIG. 39 is a partial side view of the seismic isolation device showing another embodiment installed in the lower part of the housing. 40 is a cross-sectional view taken along line AA of FIG. FIG. 41 is a partial side view when the housing of FIG. 39 is moved forward. 42 is a cross-sectional view taken along line BB in FIG. FIG. 43 is a front view of the seismic isolation device attached to the housing. FIG. 44 is a side view of the seismic isolation device attached to the housing and the housing moving forward.

  As shown in the drawing, a plurality of downward concave members 2 are fixed to the upper member 1 fixed to the upper structure 9, and a plurality of upward concave members 6 are fixed to the lower member 5 fixed to the base member 10. The rolling member 7 is interposed between the corresponding downward concave member 2 and upward concave member 6.

  A sliding bolt 4 for preventing the drop is interposed between the upper guide rail 3 and the lower guide rail 8 fixed to the upper member 1 and the lower member 5.

  As shown in FIG. 6, the upper guide rail 3 and the lower guide rail 8 are arranged so as to cross each other, and a sliding bolt 4 is slidably fitted to both cross portions.

  When the rolling member 7 rolls and the upper member 1 is lifted upward as shown in FIG. 5 from the stationary state of FIG. 4 in response to earthquake vibration or roll, the upper guide rail is energized. The position 3 moves from the stationary state of FIGS. 8 and 10 to the position of FIGS. 7 and 9.

  7 and 8, the sliding bolt 4 is slid without being disengaged from the movement of the upper member 1 in all directions, and the bolt head 42 is a spring for preventing resonance. The bolt is held by the lower guide rail 8 via 41, and the bolt tip is held by the upper guide rail 3 by the nut 43.

  Therefore, even if vertical vibrations or rolls occur intermittently, the upper member 1 and the lower member 5 return to their original restoration positions, and the function as a seismic isolation device is maintained.

Hereinafter, another embodiment will be described with reference to FIGS.
The chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a support section 18 is provided inside the chassis leg mounting C-shaped steel 15. A free marble 19 is attached.

  The free marble 19 is slidably abutted along a guide 17 provided on the installation fixing portion 16 inside the C-shaped steel 15 for mounting the case leg, and when the case 12 that receives vibration slides forward. The front part of the housing 12 is raised as shown in FIGS. 13 to 14, the free marble 19 stops at the stopper portion 171, and the center of gravity of the housing 12 moves rearward to move the housing 12 forward. It is configured to prevent.

  FIG. 43 is a front view of the seismic isolation device 20 attached to the housing 12 of a vending machine or the like, and FIG. 44 shows a state where the front of the housing 12 rises and the center of gravity moves backward. In the case of other embodiments described below, the same result as shown in FIG. 44 is obtained, and the casing 12 is prevented from being moved forward.

Hereinafter, another embodiment will be described with reference to FIGS. 15 to 18.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a ball bearing holder 22 is placed inside the chassis leg mounting C-shaped steel 15. The ball bearing 21 is attached via the via.

  The ball bearing 21 is rotatably abutted along a guide 17 provided on an installation fixing part 16 inside the C-shaped steel 15 for attaching the case leg part, and the case 12 receiving the vibration is moved forward. When sliding, the front portion of the housing 12 rises as shown in FIGS. 17 to 18, the ball bearing 21 stops at the stopper portion 171, the center of gravity of the housing 12 moves rearward, and the housing 12 is moved forward. It is configured to prevent.

Hereinafter, another embodiment will be described with reference to FIGS. 19 to 22.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a swing rubber 23 is provided inside the chassis leg mounting C-shaped steel 15. A free marble 19 is attached via

  When the free marble 19 is slidably abutted along a guide 17 provided in the installation fixing portion 16 inside the C-shaped steel 15 for attaching the case leg, and the case 12 that receives vibration slides forward. The front portion of the housing 12 rises along the curved surface of the front guide 17, the free marble 19 stops at the stopper portion 171, and the center of gravity of the housing 12 moves rearward as shown in FIG. It is configured to prevent advance.

Hereinafter, another embodiment will be described with reference to FIGS.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a swing rubber 23 is provided inside the chassis leg mounting C-shaped steel 15. A free marble 19 is attached via

  The free marble 19 is slidably contacted along guides 17 provided on the front and rear installation fixing parts 16 inside the C-shaped steel 15 for attaching the case leg part, and the case 12 receiving the vibration is moved forward. When sliding, the front part of the casing 12 rises as shown in FIGS. 25 to 26, the free marble 19 stops at the stopper 171, and the center of gravity of the casing 12 moves rearward as shown in FIG. It is configured to prevent the body 12 from being moved forward.

Hereinafter, another embodiment will be described with reference to FIGS.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a roller holder 25 is interposed inside the chassis leg mounting C-shaped steel 15. A roller 24 is rotatably attached. The roller holder 25 that is in contact with the installation fixing portion 16 is provided with a projection 27 on both or one side, and is prevented from resonating due to friction with the installation fixing portion 16, and the stopper portion 171 has a buffer rubber ( (Not shown) may be fitted to prevent damage and soundproofing, and the performance as a seismic isolation device with a drop-off preventing structure will not change even if a cushioning rubber (not shown) is not fitted.

  The roller 24 is rotatably contacted along guides 17 provided on the front and rear installation and fixing portions 16 inside the case leg mounting C-shaped steel 15, and the case 12 that receives vibration slides forward. Then, the front part of the housing 12 rises as shown in FIG. 44, the roller 24 stops at the stopper 171, and the center of gravity of the housing 12 moves rearward as shown in FIG. Is configured to prevent.

  Although the installation fixing part 16 is divided into two parts, the front and rear, in the case of FIGS. 31 to 33 shown below, the installation fixing part 16 is integrally formed.

Hereinafter, another embodiment will be described with reference to FIGS. 31 to 34.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a roller holder 25 is interposed inside the chassis leg mounting C-shaped steel 15. A roller 24 is attached.

The roller 24 is rotatably contacted along a guide 17 provided on an installation fixing portion 16 integrally formed on the inner side of the C-shaped steel 15 for mounting the case leg, and the case 12 receives vibration. When the slider slides forward, the front portion of the casing rises along the front guide, the roller 24 stops at the stopper 171, and the center of gravity of the casing 12 moves rearward as shown in FIG. It is configured to prevent 12 forwards. The roller holder 25 that is in contact with the installation fixing portion 16 is provided with a projection 27 on both or one side, and is prevented from resonating due to friction with the installation fixing portion 16, and the stopper portion 171 has a buffer rubber ( (Not shown) may be fitted.

Hereinafter, another embodiment will be described with reference to FIGS.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a roller holder 25 is interposed inside the chassis leg mounting C-shaped steel 15. A roller 24 is attached.

The roller 24 is rotatably abutted along a guide 17 provided on an installation fixing portion 16 formed by being divided into two front and rear inside the C-shaped steel 15 for mounting the case leg portion, and the housing receives vibration. When the body 12 slides forward, the front portion of the housing 12 rises as shown in FIG. 32, the front roller 24 stops at the stopper portion 171, and the center of gravity of the housing 12 moves rearward as shown in FIG. Thus, the housing 12 is configured to be prevented from being moved forward. The roller holder 25 that is in contact with the installation fixing portion 16 is provided with a projection 27 on both or one side, and is prevented from resonating due to friction with the installation fixing portion 16, and the stopper portion 171 has a buffer rubber ( (Not shown) may be fitted.

Next, another embodiment will be described with reference to FIGS.
A chassis leg 13 fixed to the chassis 12 is firmly fixed to the back of the chassis leg mounting C-shaped steel 15, and a support section 18 is provided inside the chassis leg mounting C-shaped steel 15. The marble function-equipped marble 26 is attached.

  The marble 26 with a swing function is slidably contacted along a guide 17 provided on the installation and fixing portion 16 on the front and rear sides of the C-shaped steel 15 for attaching the case leg portion, and the case 12 receiving the vibration is When sliding forward, the front part of the housing 12 rises as shown in FIG. 41, the marble 26 with a swing function stops at the stopper portion 171 and the center of gravity of the housing 12 moves rearward as shown in FIG. The casing 12 is prevented from being moved forward.

  In FIG. 31, FIG. 33, FIG. 35 and FIG. 37, the protrusion 27 provided at the lower part of the roller holder 25 arranged at the rear is normally in contact with the installation fixing part 16, and the frictional force of the contact part. Therefore, there is an effect of preventing resonance, and it does not slide easily even if a stored item is put in and out of the housing 12 or a little strong wind is received.

  According to the seismic isolation device of the present invention described above, the seismic isolation function has a function such that a part of the seismic isolation device falls off, particularly when the vibration or aftershock due to the earthquake occurs intermittently and the amplitude increases. The industrial applicability is high in order to prevent the loss and prevent the housing of the vending machine or the like from being pushed forward.

  It is a top view of the upper part member of a seismic isolation device with a drop-off prevention structure concerning the present invention.   It is a top view of the lower side member of a seismic isolation device with a drop-off prevention structure concerning the present invention.   FIG. 3 is a perspective view of FIG. 2.   It is a side view of the seismic isolation device with a drop-off prevention structure according to the present invention.   It is a side view at the time of rocking | fluctuation of the seismic isolation apparatus with a drop-off prevention structure which concerns on this invention.   It is a fragmentary perspective view of a drop-off prevention structure.   It is a fragmentary sectional view of a drop-off prevention structure.   It is a fragmentary sectional view of a drop-off prevention structure.   It is a fragmentary sectional view of a drop-off prevention structure.   It is a fragmentary sectional view of a drop-off prevention structure.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 11 moves ahead.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 15 moves ahead.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 19 moves ahead.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   FIG. 24 is a partial side view when the housing of FIG. 23 moves forward.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 27 moves ahead.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 31 moves ahead.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 35 moves ahead.   It is sectional drawing of the BB line of FIG.   It is a partial side view of the seismic isolation apparatus which shows the other Example installed in the lower part of a housing | casing.   It is sectional drawing of the AA line of FIG.   It is a partial side view when the housing | casing of FIG. 39 moves to the front.   It is sectional drawing of the BB line of FIG.   It is the front view which attached the seismic isolation apparatus to the housing | casing.   It is the side view which attached the seismic isolation apparatus to the housing | casing and the housing | casing moved ahead.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper member 2 Downward concave surface member 3 Upper guide rail 4 Sliding bolt 41 Resonance prevention spring 42 Bolt head 43 Nut 5 Lower side member 6 Upward concave surface member 7 Rolling member 8 Lower guide rail 9 Upper structure 10 Base member 11 Installation concrete 12 Housing 13 Housing leg 14 Leg fixing 15 C-shaped steel 16 for mounting chassis 16 Installation fixing 17 Guide 171 Stopper 18 Support 19 Free marble 20 Seismic isolation device 21 Ball bearing 22 Ball Bearing holder 23 Swing rubber 24 Roller 25 Roller holder 26 Marble 27 with swing function Protrusion

Claims (11)

  A plurality of downward concave members are fixed to the upper member fixed to the upper structure, and a plurality of upward concave members are fixed to the lower member fixed to the base member. The downward concave member and the upward concave member A rolling member is interposed between the upper guide rail and the lower guide rail, and a sliding bolt for preventing falling and resonance is interposed between the upper guide rail and the lower guide rail. Seismic isolation device with prevention structure.   2. The seismic isolation device with a drop-off preventing structure according to claim 1, wherein the upper guide rail and the lower guide rail are arranged so as to cross each other.   The chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a free marble is attached to the inside of the chassis leg mounting C-shaped steel via a support. Is slidably abutted along a guide provided in the installation fixing portion inside the C-shaped steel for mounting the case leg, and the front part of the case rises when the case receiving vibration slides forward. The seismic isolation device with a drop-off prevention structure is configured such that the free marble is stopped at the stopper portion, and the center of gravity of the housing moves backward to prevent the housing from falling forward.     The chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a ball bearing is mounted inside the chassis leg mounting C-shaped steel via a ball bearing holder. A bearing is rotatably abutted along a guide provided in an installation fixing part inside the C-shaped steel for mounting the leg portion of the casing. When the casing that receives vibration slides forward, the front portion of the casing , The ball bearing stops at the stopper, and the center of gravity of the housing moves rearward to prevent the housing from falling forward.   The chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a free marble is attached to the inside of the chassis leg mounting C-shaped steel via a swing rubber, When the free marble is slidably abutted along a guide provided in an installation fixing portion inside the C-shaped steel for mounting the case leg, the front portion of the case is moved when the case receiving the vibration slides forward. Rise along the curved surface of the front guide, the free marble stops at the stopper, and the center of gravity of the case moves backward to prevent the case from falling forward. Seismic device.   The chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a free marble is attached to the inside of the chassis leg mounting C-shaped steel via a swing rubber, When the free marble is slidably abutted along guides provided on the front and rear installation and fixing parts inside the C-shaped steel for mounting the leg of the case, the front of the case is moved when the case that receives vibration slides forward. The seismic isolation device with a drop-off prevention structure is configured such that the portion rises, the free marble stops at the stopper portion, and the center of gravity of the housing moves rearward to prevent the housing from falling forward.   The case leg fixed to the case is fixed to the back of the case leg-attaching C-type steel, and a roller is attached to the inside of the case leg-attaching C-type steel via a roller holder and arranged rearward. The protrusion provided on the lower part of the roller holder is in contact with the installation fixing part, and resonance is prevented by the frictional force of the contact part, making it easy to put in and out of the housing and to receive a little strong wind Without sliding, the roller is pivotally contacted along a guide provided on the front and rear installation fixing portions inside the C-shaped steel for mounting the leg portion of the casing, and the casing subjected to vibration is moved forward. The front part of the chassis rises when sliding to the top, the roller stops at the stopper, and the center of gravity of the chassis moves backward to prevent the chassis from falling forward. Seismic isolation device.   The chassis leg fixed to the chassis is fixed to the back of the chassis leg mounting C-shaped steel, and a roller is attached to the inside of the chassis leg mounting C-shaped steel via a roller holder, and arranged rearward. The protrusion provided on the lower part of the roller holder is in contact with the installation fixing part, and resonance is prevented by the frictional force of the contact part, making it easy to put in and out of the housing and to receive a little strong wind Without sliding, the roller is slidably abutted along the guides provided on the front and rear installation and fixing parts inside the C-shaped steel for mounting the leg of the casing, and the casing subjected to vibration is moved forward. The front part of the chassis rises along the front guide, the roller stops at the stopper, and the center of gravity of the chassis moves backward to prevent the chassis from falling forward. A seismic isolation device with a drop-off prevention structure.   The case leg fixed to the case is fixed to the back of the case leg-attaching C-type steel, and a roller is attached to the inside of the case leg-attaching C-type steel via a roller holder. The front part of the case rises when the case that is slidably abutted along the guides provided on the front and rear installation and fixing parts inside the C-shaped steel for mounting the case leg is slid forward. The seismic isolation device with a drop-off prevention structure is configured such that the front roller stops at the stopper portion, and the center of gravity of the housing moves backward to prevent the housing from falling forward.   The case leg fixed to the case is fixed to the back of the case leg mounting C-shaped steel, and the marble with a neck screw function is attached to the inside of the case leg mounting C-type steel via a support, When the marble with a swing function is slidably contacted along guides provided on the front and rear installation fixing portions inside the C-shaped steel for mounting the leg portion of the casing, and the casing that receives vibration slides forward The front part of the case rises, the marble with a swing function stops at the stopper part, and the center of gravity of the case moves backwards to prevent the case from falling off. Seismic isolation device with structure.   The roller holders that are in contact with the installation / fixing part are provided with projections on both or one side to prevent resonance by friction with the installation / fixing part, and the stopper part is configured to be fitted with a buffer rubber. The seismic isolation device with a drop-off prevention structure according to claim 3, wherein:

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