JP6482166B2 - Seismic isolator and supported object equipped with seismic isolator - Google Patents

Description

  The present invention relates to a seismic isolation device that suppresses transmission of seismic motion to a supported object and a supported object including the same, and more specifically, a display shelf and equipment for displaying products in a store or a showroom, The present invention relates to a seismic isolator for imparting seismic resistance to a supported object such as furniture such as furniture, and a supported object including the same.

  Conventionally, a seismic isolator for preventing a display shelf, furniture, etc. from falling due to an earthquake motion due to an earthquake, a display item arranged on the display shelf, or an article arranged on the furniture from falling, Are known.

  For example, the seismic isolator disclosed in Patent Document 1 is a base plate disposed at the corner of the bottom surface of the furniture, an adhesive layer attached to the upper surface of the base plate, and disposed on the lower surface of the base plate. A plurality of spikes that bite into the adhesive surface of the base isolation pad are integrally formed on the lower surface of the base plate.

  According to the above-mentioned seismic isolator, even if the seismic motion due to the earthquake is transmitted to the seismic isolator, the base plate spikes attached to the bottom surface of the furniture etc. bite into the gel-like synthetic resin part. The state where the base plate is fixed to the adhesive surface of the pad can be maintained. On the other hand, the vibration caused by the earthquake motion is absorbed by the seismic isolation pad and is not directly transmitted to furniture such as furniture. As a result, it is possible to suppress the shaking of furniture such as furniture by the seismic isolation device, and to prevent the furniture and the like from falling or the articles housed in the furniture from jumping out.

JP 2006-312008 A

  According to the conventional seismic isolation device, furniture such as furniture swings in a predetermined range of seismic motion that can maintain the state where the base plate spike is restrained by the adhesive surface of the seismic isolation pad, It can be prevented from falling. However, if the value of seismic motion (ie, vibration acceleration) exceeds the range in which the spike can be maintained in the adhesive surface of the seismic isolation pad, the engagement between the spike and the seismic isolation pad is suddenly released. There is a risk that furniture such as furniture falls down vigorously due to the recoil, and articles may jump out of furniture and other furniture.

  The present invention has been made in view of such circumstances. In other words, it is possible to prevent the supported object such as a fixture equipped with a seismic isolator from falling down vigorously due to vibration caused by an earthquake or the like, and preventing the article contained in the supported object from jumping out and being damaged. An object of the present invention is to provide a seismic isolation device having a simple structure and a supported object including the seismic isolation device that can be easily maintained.

  In order to solve the above-described problems and achieve the object, the inventors have conducted intensive research. As a result, the first sliding member or the first sliding surface is made of a material containing a resin having good sliding characteristics. It has been learned that the device equipped with has excellent seismic isolation performance. Specifically, according to the first aspect of the seismic isolation device of the present invention, a receiving member that is disposed on the plane portion and supports the supported object in a relatively movable manner, and a first member on which the supported object can be placed. The first sliding surface is formed of a resin-containing material.

  Further, the inventors have said that the first sliding member is constituted by a resin layer containing the resin and a porous metal sintered layer that supports the resin layer. It was found to be effective in preventing and improving durability. According to the second aspect of the seismic isolation device of the present invention based on this knowledge, the first aspect of the seismic isolation device is the first aspect including the first sliding surface and the porous metal sintered layer. 1 sliding member.

  Moreover, according to the 3rd aspect of the seismic isolation tool of this invention, it is the 1st or 2nd aspect of a seismic isolation tool, Comprising: The 2nd slide provided in the said receiving member and mounted in the said plane part A moving surface is provided, the receiving member is placed on the flat surface portion via the second sliding surface, and the second sliding surface is formed of a material containing resin.

  Further, the inventors have said that the second sliding member is composed of a resin layer containing the resin and a porous metal sintered layer that supports the resin layer. It was found to be effective in preventing and improving durability. According to the 4th aspect of the seismic isolation tool of this invention based on this knowledge, it is a 3rd aspect of a seismic isolation tool, Comprising: 2nd which comprises the said 2nd sliding surface and porous metal sintered layer. 2 sliding members.

  Furthermore, the inventors have made a number of sliding properties such as polyacetal resin, polyamide resin, polyester resin, tetrafluoroethylene resin, polyphenylene sulfide resin, and phenol resin as the resin material constituting the sliding member or sliding surface. However, among these, it has been found that a material containing a tetrafluoroethylene resin or an oil-impregnated polyacetal resin has particularly good seismic isolation performance. According to the fifth aspect of the seismic isolation device of the present invention based on this finding, in the first to fourth aspects of the seismic isolation device, the resin is at least one of a tetrafluoroethylene resin and an oil-containing polyacetal resin. It is.

  Moreover, according to the 6th aspect of the seismic isolation tool of this invention, It is any one of the 3rd-5th aspect of a seismic isolation tool, Comprising: The force which moves the said receiving member relatively with respect to the said to-be-supported object is The first sliding surface and the second sliding surface are configured so as to be smaller than a force for moving the receiving member with respect to the flat portion.

  In addition, the inventors have found that a seismic isolation device having two sliding members or sliding surfaces containing resins having different sliding frictional force and good sliding characteristics has excellent seismic isolation performance. According to the seventh aspect of the seismic isolation device of the present invention based on this knowledge, the sixth aspect of the seismic isolation device is the first sliding surface, wherein the static friction coefficient is the second sliding surface. Lower than the static friction coefficient of the surface.

  According to an eighth aspect of the seismic isolation device of the present invention, any of the first to seventh aspects of the seismic isolation device, comprising: a support member connectable to the supported object; A moving surface is provided on at least one of the support member and the receiving member, and the support member abuts on the receiving member via a first sliding surface.

  According to the ninth aspect of the seismic isolation device of the present invention, any of the first to eighth aspects of the seismic isolation device, wherein the receiving member and the first sliding surface are made of the same material. is there.

  Moreover, according to the 10th aspect of the seismic isolation tool of this invention, it is either the 3rd-8th aspect of a seismic isolation tool, Comprising: The said receiving member, the said 1st sliding surface, and the said 2nd The sliding surfaces are made of the same material.

  Moreover, according to the 11th aspect of the seismic isolation tool of this invention, it is any 2nd-10th aspect of a seismic isolation tool, Comprising: The said receiving member is a said 1st sliding member, The said receiving member It is provided with an erroneous mounting prevention unit that prevents erroneous mounting.

  Moreover, according to the 12th aspect of the seismic isolation tool of this invention, it is any one of the 1st-11th aspects of a seismic isolation tool, Comprising: The protection member for protecting the front said 1st sliding surface is provided. Prepare.

  According to the thirteenth aspect of the seismic isolation device of the present invention, the seismic isolation device includes any one of the first to twelfth aspects of the seismic isolation device, including a sheet member disposed between the planar portion and the receiving member. .

  According to a fourteenth aspect of the seismic isolation device of the present invention, in the thirteenth aspect of the seismic isolation device, the sheet member is made of polyphenylene sulfide resin.

  According to a fifteenth aspect of the seismic isolation device of the present invention, in any one of the first to fourteenth aspects of the seismic isolation device, the receiving member is provided with a buffer portion for damping a vibration force. Yes.

  According to a sixteenth aspect of the seismic isolation device of the present invention, in the second to fifteenth aspects of the seismic isolation device, the receiving member moves the first sliding member in its thickness direction. It has a regulation part to regulate.

  According to a seventeenth aspect of the seismic isolation tool of the present invention, in any of the first to sixteenth aspects of the seismic isolation tool, the receiving member includes an upper member and a lower member that are detachable from each other. ing.

  In order to solve the above-described problems and achieve the object, the first aspect of the supported object of the present invention includes any one of the first to seventeenth aspects of the seismic isolation device.

  According to the seismic isolator and the supported object having the same according to the present invention, when the vibration acceleration of the seismic motion exceeds a predetermined range, the supported object moves relative to the receiving member, so that the seismic motion is absorbed. it can. As a result, the supported object supported by the seismic isolation device and the supported object equipped with the seismic isolation device fall down vigorously, and the articles accommodated in the supported object fall vigorously from the supported object. Can be prevented.

  Moreover, the 1st sliding member or 1st sliding surface of the seismic isolation device of this invention and a to-be-supported object provided with the same is comprised from the material containing resin. Therefore, it is not necessary to periodically supply lubricating oil or the like to the first sliding member or the first sliding surface as long as it is within the service life under the assumed usage conditions, and it can be used in a completely oil-free state. The maintenance of the seismic isolation device and the supported object including the same can be facilitated. Furthermore, since it is not necessary to provide an oil sump etc., the structure of a seismic isolation tool and a to-be-supported object provided with it can be simplified.

It is a top view of the seismic isolation tool which concerns on 1st Embodiment. FIG. 2 is a partial cross-sectional view taken along line IB-IB in FIG. It is a partial expanded sectional view of IC part of Drawing 1 (b). (A) is a top view of the seismic isolator which concerns on 2nd Embodiment, (b) is a fragmentary sectional view along line IIB-IIB of Fig.2 (a), (c) is FIG. 3 is a partial cross-sectional view taken along line IIC-IIC in FIG. It is a fragmentary sectional view along the axial direction of the seismic isolation tool which concerns on 3rd Embodiment. (A) is a top view of the receiving member which concerns on a 1st modification, (b) is a front view of the receiving member which concerns on a 1st modification, (c) is FIG. 4 (a). It is sectional drawing along line IVC-IVC. (A) is a plan view of the lower member shown in FIG. 4, (b) is a sectional view taken along line VB-VB of (a), and (c) is a cross-sectional view of FIG. It is sectional drawing along line VC-VC. (A) is a bottom view of the upper member shown in FIG. 4, (b) is an enlarged view of the VIB portion of FIG. 6 (a), and (c) is a line VIC in FIG. 6 (a). FIG. (A) is a bottom view which shows an upper member provided with the control part of another aspect, (b) is sectional drawing along line VIIB-VIIB of Fig.7 (a). (A) is a top view of the receiving member which concerns on a 2nd modification, (b) is sectional drawing of the receiving member along line VIIIB-VIIIB of Fig.8 (a), (c) is FIG. 8B is an enlarged view of the VIIIC portion of FIG. 8B, and FIG. 8D is a plan view of the cover member. It is a front view which shows the display shelf provided with a seismic isolation tool. It is a side view which shows the display shelf provided with a seismic isolation tool.

  The seismic isolation device according to the embodiment to which the seismic isolation device according to the present invention is applied will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, reference numerals of elements in the first embodiment are in the 100s, reference numerals of elements in the second embodiment are in the 200s, and reference numerals of elements in the third embodiment are The reference numerals of the elements of the base isolation device according to the first modification shown in the 300 series are indicated by the 400 series, and the reference numerals of the elements of the base isolation equipment according to the second modification are indicated by the 500 series. In the first, second, and third embodiments and the first and second modifications, elements having the same reference numerals in the lower two digits have the same shape and configuration unless otherwise described.

[First Embodiment]
Fig.1 (a) is a top view which shows typically the seismic isolation tool 101 concerning 1st Embodiment, FIG.1 (b) is the partial cross section along line IB-IB of Fig.1 (a). It is a figure and (c) is the elements on larger scale of the IC part of FIG.1 (b). In FIG. 1B, only the receiving member 105 is shown as a cross section.

  As shown in FIGS. 1 (a) and 1 (b), the seismic isolation device 101 mainly receives a support for supporting a supported object such as a display shelf or furniture arranged on the floor in a relatively movable manner. A member 105 and a first sliding member 107 having a first sliding surface 107a on which the supported object can be placed. Furthermore, although the seismic isolation device 101 of this embodiment is not an essential component of the seismic isolation device 101, the seismic isolation device 101 includes a support member 121 connected to the bottom surface of the supported object, and the support member 121 is a first sliding member. It is mounted on the receiving member 105 through the moving member 107. The first sliding member 107 is made of a material containing tetrafluoroethylene resin.

  The disc-shaped receiving member 105 is provided with a recess 111 on one end face side. The recess 111 includes a flat circular bottom surface 111a and a cylindrical surface 111b that is continuous with the outer peripheral edge of the circular bottom surface 111a and extends in a direction perpendicular to the circular bottom surface 111a. The cylindrical surface 111b has a function of restricting the movement region of the support member 121 placed on the circular bottom surface 111a of the receiving member 105.

  Furthermore, the circular bottom surface 111a extends in parallel to the back surface 110 of the receiving member 105 that abuts against a flat portion such as a floor. Therefore, when the receiving member 105 is placed on a horizontal floor as shown in FIG. 1B, the circular bottom surface 111a also extends horizontally.

  A resin-made first sliding member 107 made of a material containing a tetrafluoroethylene resin is fixed to the circular bottom surface 111a. The first sliding member 107 has a uniform thickness and is dimensioned to cover the entire surface of the circular bottom surface 111a. In this way, a pedestal portion 121c described later of the support member 121 slides on the first sliding surface 107a that is the upper surface of the first sliding member 107.

As shown in FIG. 1 (c), the first sliding member 107 is a member laminated in three layers, and a base B made of a steel plate or the like, and a metal powder such as bronze based on the base B A porous metal sintered layer S formed by sintering, and a resin layer R formed on the porous metal sintered layer S in a thin film shape from a material containing a tetrafluoroethylene resin. . By forming the resin layer R as a thin film and very thin, and further providing the porous metal sintered layer S under the resin layer R, the compressive strength of the first sliding member 107 can be ensured. Therefore, creep deformation of the resin layer R can be prevented. Further, since the porous metal sintered layer S is made of a bronze-based material having good sliding characteristics, the resin layer R is abraded when the support member 121 slides on the resin layer R, so that the porous metal Even if the sintered layer S reaches an exposed state and the support member 121 slides on the porous metal sintered layer S, the support member 121 is abruptly worn or burned and damaged. Can be prevented.
In particular, when a spherical bronze metal powder is used for the porous metal sintered layer S, the effect is more preferable.

  In the present embodiment, the first sliding member 107 is a resin formed of a material including the porous metal sintered layer S and the tetrafluoroethylene resin on the base B placed on the circular bottom surface 111a. The layer R is laminated in advance and adhered to the circular bottom surface 111a of the recess 111 with an epoxy-based synthetic resin adhesive. However, the porous metal sintered layer S and the tetrafluoroethylene are directly formed on the circular bottom surface 111a. A configuration in which a resin layer R formed of a material containing a resin is laminated is also possible.

  For example, for the first sliding member 107, OILES Drymet ST, LF, etc. manufactured by OILES CORPORATION can be used. In the case of Oiles Drymet ST, the porous metal sintered layer S is formed from a bronze metal powder, and the thickness of the resin layer R formed thereon is 0.3 mm. In the case of Oiles Drymet LF, the porous metal sintered layer S is formed from a bronze-based metal powder, and the thickness of the resin layer R formed thereon is 0.03 mm.

  When the first sliding member 107 is formed only of the resin layer R, creep deformation may occur in the resin layer R due to the load applied from the support member 121 to the resin layer R. As described above, this resin By providing the porous metal sintered layer S under the layer R, the compressive strength of the first sliding member 107 as a whole can be secured even though the thickness of the resin layer R is very thin, and the resin layer R Creep deformation can be prevented. Further, the second sliding member 207 of the second embodiment to be described later has the same configuration as the first sliding member 107.

  Further, on the upper surface 112 of the receiving member 105, a ring-shaped fixing plate 115 sandwiches a rubber sheet 119 as a protective member by fastening means that are a plurality of screws 117 that are spaced apart at equal intervals in the circumferential direction. It is concluded in a state. As the screw 117, a countersunk screw with a cross hole or the like can be used.

  The rubber sheet 119 is a circular sheet member formed from a stretchable nitrile rubber or the like in a plan view, and includes an opening 119a for allowing the support member 121 to pass therethrough. When the rubber sheet 119 covers the recess 111, it is possible to prevent intrusion of dust, dust or the like into the recess 111.

  The support member 121 extends in the vertical direction in a state where the receiving member 105 is placed on a horizontal floor surface. The support member 121 has a male screw threaded along the longitudinal direction and is connected to a connecting part 121a fixed to the object to be supported, a hexagonal nut part 121b continuous to one end of the connecting part 121a, and a hexagonal nut part 121b. And a base 121c.

  The support member 121 is fixed to the fixture by screwing the connecting portion 121a with a female screw provided at the bottom of the fixture. The pedestal portion 121c has a disk shape in plan view, and has an outer diameter that is larger than the maximum outer shape of the hexagon nut portion 121b along the plane perpendicular to the longitudinal direction of the connecting portion 121a. Further, the pedestal part 121 c comes into contact with the receiving member 105 through the first sliding member 107.

  In the seismic isolation device 101 configured as described above, the force component to be moved in the left-right direction on the paper surface of FIG. 1B is a static friction force F1 (F1) between the base 121c and the first sliding surface 107a. = Μ1 · S1 · σ1: where μ1 is the coefficient of static friction of the first sliding surface 107a, S1 is the area of the pedestal 121c in contact with the first sliding surface 107a, and σ1 is the support When the surface pressure of the pedestal portion 121c applied in the axial direction (vertical direction in FIG. 1B) of the connecting portion 121a of the member 121 is exceeded, the support member 121 is relative to the first sliding member 107. Move on.

Note that the static friction coefficient μ1 of the first sliding surface 107a is such that the support member 121 starts relative movement with respect to the first sliding member 107 when a predetermined vibration force is applied to the seismic isolation device 101. Is set to Further, in the embodiment, the frictional force generated when the relative movement starts is set by appropriately selecting the static friction coefficient μ1, but S1 and σ1 that are other parameters of F1 are appropriately selected. It goes without saying that the frictional force can be set by doing so.

  Further, making the static friction force on the floor surface of the receiving member 105 larger than the static friction force on the first sliding member 107 of the support member 121 means that the static friction coefficient between the floor surface and the receiving member 105, the support The coefficient of static friction μ1 between the member 121 and the first sliding member 107, the area in contact with the floor surface of the receiving member 105, the area in contact with the first sliding member 107 of the support member 121, the floor surface of the receiving member 105 Can be set by parameters such as the surface pressure against the first sliding member 107 of the support member 121. Therefore, in the embodiment in which the above setting is performed, the vibration force exceeding the static friction force with respect to the support member 121 and the first sliding member 107 (force component to be moved in the left-right direction in FIG. 1B) is generated. When added to the support member 121 of the seismic isolation device 101, the support member 121 moves relative to the first sliding member 107. Further, when a relatively large vibration force exceeding the static friction force on the floor surface of the receiving member 105 is applied to the seismic isolation device 101, the receiving member 105 slides on the floor surface. Thus, the back surface 110 of the receiving member 105 constitutes the second sliding surface.

In the present embodiment, when the frictional force Fd generated when a vibration force is applied to the support member 121 is greater than the value of M2 [kg] · 980 [cm / s ² ] · μ0, the pedestal portion 121c of the support member 121 is The receiving member 105 moves relative to the floor surface in a state where the receiving member 111 is in contact with the cylindrical surface 111b. Here, Fd is indicated by M1 · α, M1 is a load applied to the support member 121, and α is a vibration acceleration of the support member 121 caused by the frictional force Fd. M2 is a load applied to the receiving member 105, 980 is a gravitational acceleration, and μ0 is a coefficient of static friction between the back surface 110 and the floor surface of the receiving member 105.

  As described above, when the seismic isolation device 101 according to the present embodiment is used, the support member 121 moves relative to the receiving member 105 due to the earthquake motion, so that vibration can be absorbed and the seismic isolation device is attached. It is possible to prevent the fixture from suddenly falling over and the articles accommodated in the fixture from dropping suddenly.

[Second Embodiment]
Fig.2 (a) is a top view which shows typically the seismic isolation tool 201 which concerns on 2nd Embodiment, FIG.2 (b) is the partial cross section along line IIB-IIB of Fig.2 (a). It is a figure and (c) is a fragmentary sectional view in alignment with line IIC-IIC of Fig.2 (a). 2B and 2C, only the receiving member 205 is shown as a cross section. Furthermore, about the shape and structure of the seismic isolation tool 201 which concerns on 2nd Embodiment, it mainly describes about the shape and structure different from 1st Embodiment. Therefore, the shape and configuration of elements not specifically described are the same as the shape and configuration of the elements of the seismic isolation device 101 according to the first embodiment.

  As shown in FIGS. 2B and 2C, the seismic isolation device 201 of the second embodiment is different from the first embodiment in that the second sliding member 253 is fastened with a flat head screw 251 or the like. By means, it is fixed to the back surface 210 of the receiving member 205. The second sliding member 253 is configured by a circular plate-like member in plan view. In the present embodiment, the second sliding member 253 has a circumferential direction along the outer peripheral end surface of the second sliding member 253 by a plurality of countersunk screws 251 having cross holes in the head. It is fixed at a position that is spaced apart.

  Furthermore, as in the first embodiment, the seismic isolation device 201 of the second embodiment mainly includes a support member 221 that supports a supported object such as a display shelf or furniture arranged on the floor, and a support member. A receiving member 205 on which 221 is mounted so as to be relatively movable, and a first sliding member 207 interposed between the supporting member 221 and the receiving member 205. Further, as described above, since the receiving member 205 includes the second sliding member 253 on the back surface 210, the receiving member 205 is placed on the floor surface via the second sliding member 253, and the second sliding member 253 is provided. The sliding surface 253a is in contact with the floor.

  The first and second sliding members 207 and 253 are made of a material containing tetrafluoroethylene resin. The first and second sliding members 207 and 253 can be made of a material containing at least one of a tetrafluoroethylene resin and an oil-containing polyacetal resin.

  The static frictional force F1 of the first sliding surface 207a of the first sliding member 207 placed on the circular bottom surface 211a of the receiving member 205 is a second sliding member fixed to the back surface 210 of the receiving member 205. The first sliding surface 207a of the first sliding member 207 and the second sliding surface of the second sliding member 253 so as to be smaller than the static friction force F2 of the second sliding surface 253a of 253. A static friction coefficient of 253a is selected.

  In the seismic isolation device 201 having the above-described configuration, the force component to be moved in the left-right direction on the paper surface of FIGS. 2B and 2C is the static friction between the base 221c and the first sliding surface 207a. Force F1 (F1 = μ1 · S1 · σ1: where μ1 is the coefficient of static friction of the first sliding surface 207a, and S1 is the area of the pedestal 221c in contact with the first sliding surface 207a , Σ1 exceeds the surface pressure of the pedestal portion 221c applied in the axial direction of the connecting portion 221a of the support member 221 (the vertical direction in FIGS. 2B and 2C), the support member 221 is the first. It moves relative to the sliding member 207. On the other hand, the receiving member 205 does not move with respect to the floor surface. This is because the static friction coefficient μ1 of the first sliding surface 207a is smaller than the static friction coefficient μ2 of the second sliding surface 253a, and the force component to be moved in the left-right direction is the receiving member 205 and the floor. This is because the static frictional force between the surfaces (F2 described later) is not exceeded.

  Further, a large force is transmitted to the seismic isolation device 201, and the force is a static frictional force F2 between the receiving member 205 and the floor on which the seismic isolation device 201 is placed (F2 = μ2, S2, σ2: μ2 is the coefficient of static friction of the second sliding surface 253a, S2 is the area of the second sliding surface 253a of the second sliding member 253 in contact with the floor, and σ2 is the surface of the support member 221. When the axial direction of the connecting portion 221a (the vertical direction in FIGS. 2B and 2C) is below the surface pressure of the second sliding member 253 applied), the receiving member 205 is against the floor. Slide. That is, the first sliding member 207 and the second sliding member 253 are configured so that F1 <F2.

The static friction coefficient of the second sliding surface 253a is such that the second sliding member 253 starts relative movement (sliding) with respect to the floor when a predetermined vibration force is applied to the seismic isolation device 201. Is set to Specifically, when the frictional force Fd generated when a vibration force is applied to the support member 221 is larger than the value of M2 [kg] · 980 [cm / s ² ] · μ2 (that is, F2 described above), the support is performed. In a state where the base portion 221c of the member 221 is in contact with the cylindrical surface 211b of the receiving member 211, the receiving member 205 moves relative to the floor surface. Here, Fd is represented by M1 · α, M1 is a load applied to the support member 221, and α is a vibration acceleration of the support member 221 caused by the frictional force Fd. M2 is a load applied to the second sliding member 205, 980 is a gravitational acceleration, and μ2 is a coefficient of static friction between the second sliding surface 253a and the floor surface. In the second embodiment, the frictional force generated when the relative movement starts is set by appropriately selecting the static friction coefficients μ1 and μ2, but the other parameters F1 and F2 are used. It goes without saying that the frictional force can be set by appropriately selecting a certain S1, σ1, S2, and σ2.

  Thus, when the seismic isolation device 201 of the present embodiment is used, the support member 221 first moves relative to the receiving member 205 and then the receiving member 205 moves relative to the floor surface due to the earthquake motion. Can absorb vibrations in multiple stages, and can perform seismic isolation functions for a wider range of vibration forces. As a result, it is possible to prevent the fixture on which the seismic isolation device is mounted from suddenly falling over and a sudden fall of an article accommodated in the fixture with respect to a wide range of vibration forces.

  Furthermore, in the second embodiment, the first and second sliding members 207 and 253 are made of a material containing a tetrafluoroethylene resin or an oil-containing polyacetal resin, so that the first sliding surface 207a and the second sliding member 207 and 253 are used. Since the relationship between the static friction coefficients of the two sliding surfaces 253a can be accurately controlled, the seismic isolation performance can be set reliably. Furthermore, since the sliding members 207 and 253 having a three-layer structure of the base B, the porous metal sintered layer S, and the resin layer R formed in a thin film are used, creep deformation of the resin layer R is prevented as much as possible. Because it can, it is excellent in durability. In addition, the use of a material containing tetrafluoroethylene resin or oil-impregnated polyacetal resin eliminates the need for a structure for periodically supplying lubricating oil, facilitating maintenance of the seismic isolation device, and The lifetime can be extended.

[Third Embodiment]
FIG. 3 is a partial cross-sectional view along the axis of the seismic isolation tool 301 according to the third embodiment. Further, in FIG. 3, only the receiving member 305 is shown as a cross section. Furthermore, about the shape and structure of the seismic isolation tool 301 which concerns on 3rd Embodiment, it mainly describes about the shape and structure different from 1st Embodiment. Therefore, the shape and configuration of elements not specifically described are the same as the shape and configuration of the elements of the seismic isolation device 101 according to the first embodiment.

  As shown in FIG. 3, the seismic isolation device 301 is different from the first embodiment in that a receiving member 305 is formed from a material containing a tetrafluoroethylene resin constituting the first sliding member. That is, the first sliding member and the receiving member 305 are configured as one component, and the circular bottom surface 311a configures the first sliding surface 307a. In addition, the receiving member 305 can use the material containing at least one of a tetrafluoroethylene resin and an oil-containing polyacetal resin.

  Furthermore, in the seismic isolation tool 301 having the above-described configuration, the force component to be moved in the left-right direction on the paper surface of FIG. 3 is a static friction force F3 (F3 = F3 = F) between the base 321c and the first sliding surface 307a. μ3 · S3 · σ3: Here, μ3 is a coefficient of static friction of the first sliding surface 307a, and σ3 is a pedestal portion applied in the axial direction (vertical direction in FIG. 3) of the connecting portion 321a of the support member 321. If the surface pressure exceeds 321c, the support member 321 moves relative to the receiving member 305. The static friction coefficient F3 of the first sliding surface 307a is set so that the support member 321 starts relative movement with respect to the receiving member 305 when a predetermined vibration force is applied to the seismic isolation tool 301. Yes.

  Further, making the static frictional force on the floor surface of the second sliding surface 309 of the receiving member 305 larger than the static frictional force on the first sliding surface 307a of the support member 321 means that the floor surface, the receiving member 305 and , The static friction coefficient between the support member 321 and the first sliding surface 307a, the area in contact with the floor surface of the receiving member 305, and the first sliding surface 307a of the support member 321. It can be set by parameters such as the area, the surface pressure of the receiving member 305 against the floor surface, and the surface pressure of the support member 321 against the first sliding surface 307a. Therefore, in the present embodiment in which the above setting is performed, the vibration force (force component to be moved in the left-right direction in FIG. 3) exceeding the static friction force with respect to the first sliding surface 307 of the support member 321 is immune. When added to the tremor 301, the support member 321 moves relative to the first sliding surface. Further, when a relatively large vibration force exceeding the static friction force between the receiving member 305 and the floor surface is applied to the seismic isolation tool 301, the receiving member 305 slides with respect to the floor surface.

In this embodiment, when the frictional force Fd generated by the vibration force applied to the support member 321 becomes larger than the value of M2 [kg] · 980 [cm / s ² ] · μ0, the pedestal portion 321c of the support member 321 is received by the receiving member. The receiving member 305 moves with respect to the floor surface in a state of being in contact with the cylindrical surface 311b of 311. Here, Fd is indicated by M1 · α, M1 is a load applied to the support member 321, and α is a vibration acceleration of the support member 321 caused by the frictional force Fd. M2 is a load applied to the receiving member 305, μ0 is a gravitational acceleration, and 980 is a coefficient of static friction between the back surface 310 and the floor surface of the receiving member 305.

  When the seismic isolation device 301 of this embodiment is used, the support member 321 moves relative to the receiving member 305 due to the earthquake motion, so that vibration can be absorbed and the fixture on which the seismic isolation device is mounted falls suddenly. It is possible to prevent the article contained in the fixture from dropping suddenly. Furthermore, since the receiving member 305 itself is made of a material containing at least one of an ethylene tetrafluoride resin and an oil-containing polyacetal resin, it is not necessary to prepare the first sliding member as in the first embodiment. Processing costs can be reduced.

(Modification of the third embodiment)
As a modification of the present embodiment, the back surface 310 of the receiving member 305 can be configured as the second sliding surface 309 as in the second embodiment. Specifically, the static friction coefficient μ3 of the first sliding surface 307a which is the circular bottom surface 311a of the receiving member 305 is smaller than the static friction coefficient μ4 of the second sliding surface 309 of the receiving member 305. The coefficient of static friction and the like of the first sliding surface 307a and the second sliding surface 309 are selected.

  In the seismic isolation tool 301 having the above-described configuration, the force component to be moved in the left-right direction on the paper surface of FIG. 3 is a static friction force F3 (F3 = μ3 ·) between the base 321c and the first sliding surface 307a. S3 · σ3: Here, μ3 is a coefficient of static friction of the first sliding surface 307a, and σ3 is a pedestal portion 321c applied downward in the axial direction (vertical direction in FIG. 3) of the connecting portion 321a of the support member 321. If the pressure exceeds the pressure, the support member 321 moves relative to the receiving member 305. On the other hand, the receiving member 305 does not move with respect to the floor surface. This is because the static friction coefficient μ3 of the first sliding surface 307a of the receiving member 305 is smaller than the static friction coefficient μ4 of the second sliding surface 309, and the force component to be moved in the left-right direction is This is because the static frictional force (F4 described later) between the receiving member 305 and the floor surface is not exceeded.

  A greater force is transmitted to the seismic isolation tool 301, and the force is a static frictional force F4 between the receiving member 305 and the floor on which the seismic isolation tool 301 is placed (F4 = μ4 · S4 · σ4: where μ4 Is the coefficient of static friction of the second sliding surface 309, S4 is the area of the second sliding surface 309 of the second sliding member 353 in contact with the floor, and σ4 is the connection of the support member 221 When the surface pressure of the receiving member 305 applied to the lower part of the portion 321a in the axial direction (vertical direction in FIG. 3) is exceeded, the receiving member 305 slides with respect to the floor. That is, the region that forms the first sliding surface 307a and the region that forms the second sliding surface 309 of the receiving member 305 are formed so that F3 <F4 holds.

The static friction coefficient of the second sliding surface 309 is set so that the receiving member 305 starts relative movement (sliding) with respect to the floor when a predetermined vibration force is applied to the seismic isolation device 301. ing. Specifically, when the frictional force Fd generated by the vibration force applied to the support member 321 becomes larger than the value of M2 [kg] · 980 [cm / s ² ] · μ4, the pedestal portion 321c of the support member 321 becomes the receiving member. The receiving member 305 moves with respect to the floor surface in a state of being in contact with the cylindrical surface 311b of 311. Here, Fd is indicated by M1 · α, M1 is a load applied to the support member 321, and α is a vibration acceleration of the support member 321 caused by the frictional force Fd. M2 is a load applied to the receiving member 305, 980 is a gravitational acceleration, and μ4 is a coefficient of static friction between the back surface 310 and the floor surface of the receiving member 305. In the third embodiment and its modification, the frictional force generated when the relative movement starts is set by selecting the static friction coefficients μ3 and μ4, but other than the above F3 and F4 It goes without saying that the frictional force can be set by appropriately selecting the parameters S3, σ3, S4, and σ4.

  Thus, when the seismic isolation device 301 of this embodiment is used, the support member 321 first moves relative to the receiving member 305 and then the receiving member 305 moves relative to the floor surface due to the earthquake motion. It can absorb shocks in multiple stages and can perform seismic isolation functions for a wider range of vibration forces. As a result, it is possible to prevent the fixture on which the seismic isolation device is mounted from suddenly falling over and a sudden fall of an article accommodated in the fixture with respect to a wide range of vibration forces.

  In the first embodiment, the second sliding member is not provided, but the function of the second sliding member is achieved by integrally forming the receiving member from a material containing tetrafluoroethylene resin or oil-containing polyacetal resin. It is also possible to have it.

  The first sliding members 107 and 207 of the seismic isolation devices 101 and 201 of the first and second embodiments are configured to be provided in the recess 111 (211) of the receiving member 105 (205). However, it is good also as a structure provided in the site | part which slides with respect to the receiving member 105 (205) of the base part 121c (221c), or a structure provided in both the base part 121c (221c) and the recessed part 111 (211).

Further, in the support member 121 of the first and second embodiments, the support portion 121a, the hexagonal nut portion 121b, and the pedestal portion 121c are configured as one integrally molded component. You may comprise as.
In the first and second embodiments, each of the receiving member and the first and second sliding members is circular in plan view, but a polygon such as a rectangle, an ellipse, etc. can be changed for each element. Needless to say.

  Although the receiving member of 1st-3rd embodiment comprises the plate-shaped part which has circular bottom face 111a, 211a, 311a and the cylindrical part which has cylindrical surfaces 111b, 211b, 311b as one component. The plate-like member having the circular bottom surface and the cylindrical member having the cylindrical surface can be configured as separate members. By configuring in this way, it is possible to change the combination of the plate-like member and the support portion and the floor that move relative to the plate-like member according to the use environment of the seismic isolation device such as the supported portion and the floor surface. This increases the degree of freedom in designing seismic isolation devices. The plate member and the cylindrical member can be coupled by screwing or by providing a convex portion on one side, a concave portion on the other side, and locking the convex portion on the concave portion.

  Furthermore, the 1st sliding surface provided in the receiving member of the 1st-3rd embodiment is extended in parallel with the floor surface in which a seismic isolation tool is mounted. With this configuration, even when vibration due to an earthquake or the like is transmitted to the seismic isolation device, it can be prevented from moving in synchronization with the vibration cycle, so that the expected seismic isolation performance of the seismic isolation device is ensured. Can demonstrate.

  Although the said embodiment showed the case containing the resin material of at least any one of a tetrafluoroethylene resin and an oil-containing acetal resin which is an example which applied the especially preferable material as a sliding member or a sliding surface, it is desirable. Depending on seismic isolation performance and durability, it is possible to use materials containing resin materials with good sliding properties such as polyamide resin, polyester resin, polyphenylene sulfide resin, phenol resin, etc. in addition to the above two resin materials Needless to say, there is.

The sliding member of the first embodiment (and the second embodiment) is configured to use the porous metal sintered layer S in order to improve the fixing property of the resin layer R to the base B. However, instead of the porous metal sintered layer S, a metal network can be used. As a net-like body, a thin metal plate is placed in a direction perpendicular to the stationary mold or between the stationary lower mold having a straight blade and the movable upper mold having a wave shape, a trapezoidal shape, a triangular shape, or the like. Expanded metal, warp and weft produced by feeding obliquely to the blade, reciprocating the movable upper die up and down, and cutting the metal sheet at the same time to widen the cut and form a regular mesh row Examples thereof include a woven wire mesh formed by weaving fine metal wires, and a braided wire mesh formed by weaving fine metal wires. Further, the fixing property of the resin layer R to the base B is improved by roughening the surface of the base B or providing unevenness on the surface, and the resin layer R is used as the base without using the porous metal sintered layer S. It is also possible to laminate directly on B so that both sliding characteristics and creep resistance are satisfied.

  The support members of the first to third embodiments and the modified examples are not essential components of the seismic isolation device, but for supporting a supported object on a plane portion having a predetermined area on the floor, the ground, a mounting table, or the like. It's just a leg. Therefore, although the seismic isolation device of the said embodiment and modification is the structure in which the supporting member is incorporated, it shall be set as the structure which does not have a supporting member using the supporting member previously mounted | worn to the to-be-supported object. Is also possible.

  Next, the seismic isolation devices 401 and 501 according to the first and second modifications of the seismic isolation devices 101, 201, and 301 in the first embodiment, the third embodiment, and the modifications thereof will be described. Note that the receiving members 405 and 505 of the seismic isolation devices 401 and 501 according to the first and second modified examples are configured such that the second sliding member and the receiving member are separated as in the second embodiment. It goes without saying that it is also possible to do. Accordingly, the seismic isolation devices 401 and 501 according to the first and second modified examples described later can be used in any of the above-described first to third embodiments and modified examples thereof. Moreover, the various modifications described regarding the first to third embodiments and the modifications thereof can be applied to the seismic isolation devices 401 and 501 according to the first and second modifications described later.

[First modification of seismic isolator]
A seismic isolation device 401 according to a first modification will be described with reference to FIGS. 4A is a plan view of the seismic isolation device 401 according to the first modification, and FIG. 4B is a front view of the seismic isolation device 401 according to the first modification. (C) is sectional drawing along line IVC-IVC (diameter) of Fig.4 (a). 5A is a plan view of the lower member 461 shown in FIG. 4, and FIG. 5B is a cross-sectional view taken along line VB-VB (diameter) of FIG. 5 (c) is a cross-sectional view taken along line VC-VC (radius) in FIG. 5 (a), and FIG. 6 (a) is a bottom view of the upper member 463 shown in FIG. FIG. 6B is an enlarged view of the VIB portion of FIG. 6A, and FIG. 6C is a cross-sectional view taken along the line VIC-VIC (radius) of FIG. FIG. 7A is a bottom view showing an upper member 463 including a regulating portion 463e according to another aspect, and FIG. 7B is a cross-sectional view taken along line VIIB-VIIB (radius) in FIG. 7A. .

  As shown in FIGS. 4A to 4C, the receiving member 405 of the seismic isolation device 401 includes a lower member 461 provided with a recess 411 and an upper member 463 to which the lower member 461 is fixed. Is done. The first sliding member 407 is attached to the recess 411 as in the embodiment described above. As shown in FIG. 5A, the lower member 461 has a circular shape, and the peripheral wall portion 481 that defines the recess 411 has a rectangular bottom with a rounded shape in plan view at regular intervals in the circumferential direction. A plurality of lightening portions 477 which are holes are provided.

  At a portion where the circular bottom surface 411a that defines the recess 411 and the cylindrical surface 411b are connected, there is a claw portion that is an erroneous mounting prevention unit for preventing the first sliding member 407 from being mounted in an incorrect direction. Has been placed. In the present embodiment, three claw portions 471, 473, and 475 are provided, and two claw portions 471, 473 arranged opposite to each other in the diameter direction of the cylindrical surface 411b, and closer to the claw portion 473 than the claw portion 471 in the circumferential direction. Another nail portion 475 is arranged.

  On the other hand, in the outer peripheral edge portion 407b (see FIG. 4C) of the first sliding member 407, the first sliding surface 407a of the first sliding member 407 is placed on the upper surface (upper side of the upper member 463). In addition, recessed concave positioning portions 407c, 407d, and 407e that can accommodate the claw portions 471, 473, and 475 are provided at positions corresponding to the claw portions 471, 473, and 475. As described above, the positioning recesses 407c, 407d, and 407e of the first sliding member 407 and the claw portions 471, 473, and 475 of the recess 411 accommodated in the positioning recesses 407c, 407d, and 407e are provided asymmetrically with respect to their diameters. Accordingly, the user can install the first sliding member 407 on the lower member 461 so that the first sliding surface 407a of the first sliding member 407 is uniquely upward in FIG. .

  In addition, although the mismounting prevention part was set as the structure which provides a nail | claw part in the lower member 461 asymmetrically regarding a diameter, this invention is not limited to this structure. For example, the outer peripheral surface 407f of the first sliding member 407 is tapered, and the cylindrical surface 411b is complementary to the tapered shape, or is complementary to a single convex portion and convex portion having an asymmetric shape. By providing a concave portion having a desired shape on the lower member 461 and the first sliding member 407, an erroneous mounting preventing portion having a configuration in which the first sliding surface 407a can be uniquely arranged in a desired direction can be configured. In addition, the erroneous mounting prevention unit is provided in the receiving members 405 and 505 according to the first and second modified examples configured by two parts, but the first to third implementations configured by one part. It is also possible to provide the receiving members 105, 205, and 305 in the form and the modified examples thereof.

  Further, the peripheral wall portion 481 of the lower member 461 is engraved with a lightening portion 477 which is a concave portion disposed at equal intervals in the circumferential direction. By providing the thinned portion 477, the peripheral wall portion 481 can have flexibility in the radial direction, and press fitting of an upper member 463, which will be described later, into the lower member 461 becomes easy.

(Upper member)
The upper member 463 will be described with reference mainly to FIGS. 6 (a) to 6 (c) and FIGS. 7 (a) and 7 (b). 6A is a bottom view of the upper member 463 shown in FIG. 4, FIG. 6B is an enlarged view of the VIB portion of FIG. 6A, and FIG. 6A is a cross-sectional view taken along line VIC-VIC (radius) of FIG. 6A, and FIG. 7A is a bottom view showing an upper member 463 including a restriction portion 463 e of another aspect, and FIG. ) Is a cross-sectional view taken along line VIIB-VIIB (radius) in FIG.

  The upper member 463 is an annular member, and as shown in FIG. 4 (b), a flat top wall portion 463a and an outer peripheral wall portion extending from the outer periphery of the top wall portion 463a so as to widen in the front view. 463b. As shown in FIG. 6C, the upper member 463 includes an inner peripheral wall portion 463c extending in a direction substantially perpendicular to the top wall portion 463a, and the outer peripheral wall portion 463b and the inner peripheral wall portion 463c are substantially acute angles. Is made.

  Further, in the annular space defined between the outer peripheral wall portion 463b and the inner peripheral wall portion 463c, ribs 487 extend at equal intervals in the circumferential direction so as to connect the outer peripheral wall portion 463b and the inner peripheral wall portion 463c. To do. Further, in order to allow the upper member 463 to be press-fitted into the lower member 461, the inner peripheral surface 463d of the inner peripheral wall portion 463c protrudes radially inward from the position of the outer peripheral surface 481a of the lower member 461 at equal intervals in the circumferential direction. Two protrusions 482, 483, and 484 are provided. That is, the length dimension of the protrusions 482, 483, and 484 in the diametrical direction from the inner peripheral surface 463d is the diameter of the inner peripheral circle that is in contact with the tips of the protrusions 482, 483, and 484, and the outer peripheral surface of the lower member 461. It is dimensioned to be smaller than the diameter of 481a.

The diameter dimension of the inner peripheral surface 463d of the inner peripheral wall portion 463c of the upper member 463 is slightly larger than the diameter dimension of the outer peripheral surface 481a of the lower member 461. Accordingly, the outer peripheral surface 481a of the lower member 461 is bent inward in the radial direction and / or the inner peripheral surface 463d of the upper member 463 is bent outward in the radial direction by the protrusion height of the protrusions 482, 483, and 484. Thus, the inner peripheral surface 463d of the upper member 463 can be easily fitted into the outer peripheral surface 481a of the lower member 461, and both members can be assembled. After the assembly, the lower member 461 and the upper member 463 are fixed in a press-fitted state by the elastic biasing force of the protrusions 482, 483, and 484 provided on the inner peripheral surface 463d of the upper member 463.
Furthermore, the workability of assembling the upper member 463 with respect to the lower member 461 is further improved by forming the inner peripheral surface 463d of the inner peripheral wall portion 463c of the upper member 463 into a tapered shape.

  An inner diameter side end portion 463g of the top wall portion 463a of the upper member 463 is continuous with the annular top wall portion 463a and is perpendicular to the top wall portion 463a in the state shown in FIG. 4B (inner peripheral wall portion). A regulating portion 463e that extends continuously in the circumferential direction of the top wall portion 463a. The inner peripheral surface 463f of the restricting portion 463e is dimensioned smaller than the outer diameter of the outer peripheral surface 407f of the first sliding member 407. Therefore, in a state in which the upper member 463 is assembled to the lower member 461, the first sliding member 407 held by the lower member 461 temporarily approaches the top wall portion 463a of the upper member 463 (first Even if the movement is relatively large in the thickness direction of the sliding member 407, the regulating portion 463e can prevent the lower member 461 from dropping out from the recess 411. As shown in FIG. 7B, the length of the restricting portion 463e in the downward direction (the direction in which the inner peripheral wall portion 463c extends) is the same as that of the first sliding member when the upper member 463 is assembled to the lower member 461. The moving member 407 may be dimensioned so as to reach the first sliding surface 407a. In this case, unnecessary play due to play in the thickness direction of the sliding member 407 can be preferably prevented.

  In the above example, the restricting portion 463e is provided on the upper member 463. However, the restricting portion may be provided on the lower member 461 or may be provided on both the lower member 461 and the upper member 463. For example, a convex portion protruding inward in the radial direction can be provided as a restricting portion on the cylindrical surface 411b of the concave portion 411 of the lower member 461. When the first sliding member 407 is mounted in the recess 411, a force is applied to the first sliding member 407 to deflect one or both of the first sliding member 407 and the convex portion. The first sliding member 407 is disposed on the circular bottom surface 411a beyond the convex portion. Similarly, a similar convex portion can be provided as a restricting portion on the cylindrical surface (for example, reference numeral 111b in FIG. 1) of the concave portion of the receiving member according to the first to third embodiments and modifications thereof. is there.

  The upper member 463 only needs to have elasticity that can be bent to such an extent that it does not hinder the fitting into the lower member 461, and there is no particular limitation on the material. Further, the restricting portion 463e of the upper member 463 is extended to the first sliding surface 407a of the first sliding member 407, and the support member for the fixture as a supported object (see FIG. 1) is provided on the inner peripheral surface 463f. A buffer portion 464 (see FIGS. 7A and 7B) can be provided in preparation for the pedestal portion (see the reference symbol 121c in FIG. 1) of the pedestal (see the reference symbol 121). As a material of the buffer portion 464, a fibrous material such as a felt material or an elastic material such as a rubber material is suitable.

  The buffer portion 464 is provided on the inner peripheral surface 463f of the restricting portion 436e of the upper member 463 extending to the first sliding surface 407a of the first sliding member 407, but the restricting portion 436e is the first one. In the case where it does not extend to the sliding surface 407a, it may be provided on the cylindrical surface 411b (see FIG. 5) of the recess 411 of the lower member 461.

  Further, the back surface 410 of the lower member 461 which is the second sliding surface slides, and the obstacle such as a wall (refer to the reference symbol W in FIG. 9A) close to the fixture which is the supported object. In preparation for the contact, a buffer portion may be provided on the outer peripheral surface 463h of the outer peripheral wall portion 463b of the upper member 463. Like the buffer portion 464 provided on the inner peripheral surface 463f of the restricting portion 463e described above, a fibrous material such as a felt material or an elastic material such as a rubber material is used as the material of the buffer portion provided on the outer peripheral wall portion 463b. Can do.

  As a result, the pedestal portion (reference numeral 121c in FIG. 1) of the support member (see reference numeral 121 in FIG. 1) of the fixture (see reference numeral 601 in FIG. 9) is vibrated, thereby the cylindrical surface 411b of the lower member 461. (Refer to FIG. 5.) Or, when contacting the restricting portion 463e of the upper member 463, it is possible to reduce the impact acting on the fixture and the article placed on the fixture. Further vibrations act on the pedestal (see reference numeral 121c in FIG. 1) and the back surface 410 as the second sliding surface slides, and the wall (FIG. 9 (FIG. 9 ( When the obstacle such as a) and the upper member 463 come into contact with each other, the impact acting on the fixture and the article placed on the fixture can be reduced.

  The buffer portion includes an upper member 463 portion with which a pedestal portion (see reference numeral 121c in FIG. 1) of a support member (see reference numeral 121 in FIG. 1) abuts, and obstacles around the fixture that is a supported object. The upper member 463 is provided at the portion of the upper member 463 that comes into contact with the upper member 463. Instead, the upper member 463 itself is made of a material that can be elastically deformed, more preferably a material that has a damping property that can attenuate the vibration force acting on the seismic isolation device. Can do. In order to impart attenuation, for example, a rubber material or a silicone resin as a soft resin can be used.

  Moreover, it cannot be overemphasized that a buffer part is applicable also to the receiving member of the seismic isolation tool which concerns on 1st-3rd embodiment and its modification. The buffer portion is a cylindrical surface of the receiving member (for example, refer to 111b in FIG. 1) and an outer surface of the receiving member on which an obstacle such as a wall (see reference numeral W in FIG. 9A) may come into contact. Can be provided on one or both of the outer peripheral surfaces (see reference numeral 105h in FIG. 1), and the receiving member itself can be made of a damping material.

[Sheet material]
In addition, the seismic isolation device 401 of this modification (and a second modification described later) includes a sheet member 471 disposed between the floor surface and the back surface 410 of the lower member 461 of the receiving member 405. . The sheet member 471 can be formed from, for example, PPS (polyphenylene sulfide) resin.

  For example, when re-applying wax on a flat surface such as the floor surface on which the seismic isolation device 401 is placed, even if a wax remover or wax enters or does not enter between the receiving member 405 and the floor surface, it depends on the location. In order to prevent the friction coefficient between the receiving member 405 and the floor surface which is a flat portion from being varied due to the different state of the floor surface, the seismic isolation device 401 does not exhibit the desired performance. It is also preferable to lay a sheet member 471 under the seismic isolation device 401.

The sheet member 471 is not limited to the above-described PPS resin, and can be formed from other materials having the following four conditions.
(1) Excellent peelability. For example, when the seismic isolation device 401 receives vibration due to seismic motion or the like, even if there is a solidified wax on the sheet member 471, it affects the predetermined operation of the seismic isolation device described in the embodiment and its modifications. It is necessary that the sheet member 471 has such a releasability that the wax is easily peeled off from the sheet member 471.
(2) Excellent alkali resistance. For example, since the floor surface, which is a flat surface where the seismic isolation device 401 is disposed, is in an environment where a strong alkaline wax remover is used, the floor surface needs to have a property of being hardly attacked by an alkaline solvent.

(3) Excellent durability. As described in the embodiment and the modifications thereof, for example, the first sliding surface 407a and the back surface 410 of the lower member 461 constituting the second sliding surface have a predetermined relationship with respect to the static friction coefficient. Is set as follows. Therefore, the sheet member 471 needs to maintain a surface state in which the back surface 410 of the lower member 461 has a predetermined static friction coefficient even after a long time has elapsed with respect to the surface of the sheet member 471, that is, has to have durability. It is.
(4) Excellent load resistance: The sheet member 471 has such load resistance that the sheet member 471 is not broken by a load received from the seismic isolation device 401, for example. In the case where only a relatively low load is applied to the sheet member 471, the sheet member 471 can be formed from PTFE (tetrafluoroethylene) resin.

[Second modification of seismic isolator]
Next, FIG. 8A to FIG. 8D, FIG. 9A, and FIG. 9B for a fixture that is an example of a supported object including the seismic isolation device 501 and the seismic isolation device 501 according to the second modification. This will be described with reference to FIG. FIG. 8A is a plan view of the seismic isolation device 501 according to the second modification, and FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8 (c) is an enlarged view of the VIIIC portion of FIG. 8 (b), FIG. 8 (d) is a plan view of the cover member 519, and FIG. 9 (a) is a display including the seismic isolation device 501. FIG. 9B is a front view showing the shelf 601 and FIG. 9B is a side view showing the display shelf 601 including the seismic isolation device 501.
It is.

  The receiving member 505 of the seismic isolation tool 501 according to the second modification has a configuration in which the upper member 563 and the lower member 561 are fixed by snap fit. Since other configurations are the same as those of the seismic isolation device 401 according to the first modification, the description will focus on different matters. Moreover, about the structure and effect which are not described regarding the seismic isolation tool 501 which concerns on a 2nd modification, it is the same as the seismic isolation instrument 401 which concerns on a 1st modification. Furthermore, it goes without saying that the buffer part and the restricting part of another aspect described in relation to the first modification can also be applied to the seismic isolation device 501 according to the second modification.

  As shown in FIG. 8C, a hook-like shape provided on the outer peripheral portion 563 b of the upper member 563 is formed on the engaging step portion 561 a formed on the outer peripheral portion of the lower member 561 constituting the receiving member 505. The holding portion 563a is fitted and hooked using the elasticity of the holding portion 563a. It is also possible to employ a configuration in which an engaging step portion is provided on the upper member 563 and a hook-like holding portion is provided on the lower member 561.

[Protective member]
Also, the receiving member 505 of this modification is mounted with a cover member 519 as a protective member, like the rubber sheets 119, 219, and 319 shown in the above-described embodiment and its modification, and wax, It is prevented that the wax release agent, dust, etc. enter the recess 511 of the receiving member 505 and the first sliding surface 507a does not perform its intended function. The cover member 519 has a predetermined thickness, and has a crescent shape in plan view as shown in FIGS. 8A and 8D so as to cover a part of the recess 511.

[Display shelf]
Next, a case where the support member 521 of the display shelf 601 as a fixture is placed on the seismic isolation tool 501 will be described with reference to FIG. As shown in FIGS. 9A and 9B, the fixture 601 includes a base 617 on which the support member 521 is mounted on the lower surface, three columns 611 that are erected on the upper surface of the base 617, Two back plates 619 that extend between the three columns 611 and stand upright from the upper surface of the base 617, and three-stage shelves 613 that are spanned by the three columns 611 and spaced apart from each other in the longitudinal direction of the columns 611, And a support plate 615 that is mounted on the column 611 and supports each shelf 613.

  The display shelf 601 is arranged such that a column 611 arranged on the left side in front view of FIG. Further, as shown in the side view of FIG. 9B, when the passage I through which a person passes is extended on both sides of the display shelf 601, the cover member 519 has a recess 511 on the side of the passage I through which the person passes. It is preferable to attach to the recess 511 so as to cover a part of the area.

  Also, the cover member 519 smoothly continues to both ends of the arc-shaped portion 519a having substantially the same radius of curvature as the circular bottom surface 511a constituting the recess 511, and protrudes in the same direction as the arc-shaped portion 519a. It is defined by a curved portion 519b having a certain predetermined radius of curvature. Further, when the support member 521 collides with the cover member 519 due to the relative movement of the support member 521 with respect to the receiving member 505, the cover member 519 is easily detached from the recess 511 or easily deformed in the recess 511. .

  Although the above-described seismic isolation devices 401 and 501 are seismic isolation devices including the sheet members 471 and 571, they can also be used as seismic isolation devices that do not include the sheet member. Further, the seismic isolation devices 101, 201, and 301 can also be used as seismic isolation devices with a sheet member. Furthermore, in the seismic isolation devices 401 and 501 according to the above-described modified examples, the upper member and the lower member are assembled so as to be detachable by press-fitting or snap-fit, but the present invention is not limited to this means, and uses screws or the like. It is also possible to assemble both members. As described above, since the upper member can be detached from the lower member, it is possible to easily perform maintenance of the seismic isolation tool such as replacement of the first sliding member. Of course, the upper member and the lower member may be fixedly assembled with an adhesive or the like.

  Further, in this specification, the supported items of the seismic isolator are furniture such as display shelves and furniture, but other supported items may be used, for example, household appliances such as refrigerators, server racks, and moldings. The seismic isolator can be used for industrial machines such as machines and cutting machines.

101, 201, 301, 401, 501 Seismic isolator 105, 205, 305, 405, 505 Receiving member 107, 207, 407, 507 First sliding member 107a, 207a, 307a, 407a, 507a First sliding Surface 253 Second sliding member 253a, 309 Second sliding surface 111, 211, 311, 411, 511 Recess 119, 219, 319 Rubber sheet 121, 221, 321 Support member 407c, 407d, 407e Positioning recess 461, 561 Lower member 463, 563 Upper member 471, 473, 475 Claw part 482, 483, 484 Projection part 519 Cover sheet 561a Engaging recess 563a Holding part 601 Display shelf

Claims (1)

A receiving member disposed on the flat surface for supporting the supported object in a relatively movable manner;
The receiving member has an upper member, a lower member, and a sliding member having a sliding surface,
The lower member has a recess having a peripheral wall portion and a circular bottom surface,
The sliding member is placed on a circular bottom surface of the concave portion of the lower member, and an outer periphery of the sliding member is substantially the same diameter as an inner periphery of a peripheral wall portion of the lower member,
The upper member has an annular shape and is attached to the peripheral wall portion of the lower member by press-fitting or snap fitting , and the inner peripheral dimension of the upper member is smaller than the inner peripheral dimension of the peripheral wall portion of the lower member. A seismic isolator characterized by that.

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