JP5848554B2 - Anti-vibration stand - Google Patents

Description

  The present invention relates to a vibration isolating stand that absorbs vibrations generated by a vibration generating device such as an air conditioner outdoor unit.

  Conventionally, in order to prevent vibration generated from a vibration generating device such as an air conditioner outdoor unit from being transmitted to the foundation, a vibration isolator is interposed between the vibration generating device and the foundation (for example, see Patent Document 1). ).

  This anti-vibration stand is provided between the rectangular “lower frame” attached to the foundation, the rectangular “upper frame” on which the vibration generating device is placed and fixed, and the upper and lower frames. It is placed and fixed on the frame so that the load of the vibration generating device and the vibration absorber that receives the vibration and the arrangement interval in the vertical direction between the upper frame and the lower frame are regulated to be within the set range. The upper frame movement amount restricting unit that restricts the amount of deviation in the horizontal direction is roughly configured.

JP 2001-304335 A

  In the conventional anti-vibration mount, as described above, the upper frame movement amount regulating unit regulates the vertical gap between the upper frame and the lower frame within the set range and regulates the horizontal shift amount. Therefore, when an earthquake or the like occurs and a large vertical or horizontal force is applied to the anti-vibration stand, the upper frame movement amount restricting portion is not damaged. When it functions effectively as an earthquake-resistant structure, it is possible to prevent the equipment mounted on and fixed to the upper frame from being overturned and the equipment to be damaged due to the overturn.

  However, a huge earthquake exceeding the expected range occurred, and when the earthquake occurred, excessive vibration energy was given to the upper frame movement restriction part and the upper frame movement restriction part was damaged, making it effective as an earthquake resistant structure. In the event that it becomes impossible to function properly, there is a risk that the device placed and fixed on the upper frame will fall over and be damaged by a large shake thereafter.

  In other words, the conventional anti-vibration frame has an earthquake-resistant structure that resists earthquakes with the rigidity and strength of the upper frame movement restriction part. However, it lacked the viewpoint of mitigating the impact force caused by earthquakes.

  Therefore, the main problem of the present invention is to provide not only an earthquake-resistant structure that resists earthquakes by the rigidity and strength of members, but also a vibration isolator that is added with an anti-vibration technology that reduces and mitigates the impact force caused by an earthquake. is there.

The first invention in the present invention is:
(A) a lower frame 14 installed on the load carrying surface 12, an upper frame 16 on which the mounting device M is placed, a vibration absorber 22 disposed between the lower frame 14 and the upper frame 16, In the anti-vibration mount 10 having the upper frame movement amount regulating unit 18 that regulates the movement amount of the upper frame 16 in the vertical and horizontal directions with respect to the lower frame 14,
(B) The upper frame movement amount restricting portion 18 is
A restriction bolt 52 provided on the lower frame 14 or the upper frame 16, and
An insertion hole 33 formed in the lower frame 14 or the upper frame 16 and through which the restriction bolt 52 is inserted with a gap d;
An upper frame movement amount regulating nut 60 screwed to the tip end portion of the regulating bolt 52 beyond the insertion hole 33 of the lower frame 14 or the upper frame 16;
It is made of at least one material selected from the group consisting of ceramics, glass, low-yield steel, and aluminum material, and the lower frame 14 is formed on the shaft portion between the lower frame 14 and the upper frame 16 of the regulation bolt 52. (C) comprising a regulation bolt 52, a lower frame 14, and a vibration reducing washer 20 having a mechanical strength smaller than that of the upper frame 16 (c). The anti-vibration mount 10 is.

  As described above, in the event of an earthquake, the lower frame 14 largely shakes in the vertical or horizontal direction with respect to the upper frame 16 on which the mounted device M is mounted, and the upper frame 16 on which the mounted device M is mounted responds to the upper frame 16. In the meantime, the lower frame 14 and the upper frame 16 collide violently with the vibration reducing washer 20, but in the present invention, a clearance C is provided between the upper frame 16 and the lower frame 14 on the shaft portion of the regulating bolt 52. Therefore, since the vibration reducing washer 20 having a mechanical strength smaller than that of the regulating bolt 52, the lower frame 14, and the upper frame 16 is screwed, the relative movement amount of the lower frame 14 and the upper frame 16 is increased with respect to the lower frame 14 and the upper frame 16. Just by moving by a clearance C that is much narrower than the distance T between the frame 16 and the shock absorber 20, the shock absorber 20 is struck violently. This means that it collides with the vibration reducing washer 20 at a stage where the acceleration at the initial stage of movement is small. At that time, the seismic washer 20 having a low mechanical strength is deformed or broken, so that the energy of the earthquake is reduced in the initial stage of movement. As a result, the regulation bolt 52, after the seismic washer 20 is deformed or broken, Even if an earthquake energy is applied to the lower frame 14 and the upper frame 16, the energy is no longer left to damage the regulating bolt 52, the lower frame 14 or the upper frame 16, and damage due to these earthquakes is not caused. You can be spared.

The second invention in the present invention is:
(A) a lower frame 14 installed on the load carrying surface 12, an upper frame 16 on which the mounting device M is placed, a vibration absorber 22 disposed between the lower frame 14 and the upper frame 16, In the anti-vibration mount 10 having the upper frame movement amount regulating unit 18 that regulates the movement amount of the upper frame 16 in the vertical and horizontal directions with respect to the lower frame 14,
(B) The vibration absorber 22 is
A compression coil spring 66 for carrying a load;
A lower case 62 attached to the lower portion of the compression coil spring 66;
An upper case 64 attached to an upper portion of the compression coil spring 66 and covering an upper surface and a side surface of the compression coil spring 66;
The outer cylinder 70a loosely inserted inside the compression coil spring 66 and at least one material selected from the group consisting of ceramics, glass, low yield steel and aluminum material, and the inner surface of the outer cylinder 70a A vibration-reducing mechanism 70 including an inner cylinder 70b that is loosely inserted with a clearance C3 narrower than a horizontal movement distance allowed by the upper frame movement restriction portion 18 therebetween and has a mechanical strength smaller than that of the outer cylinder 70a. The anti-vibration stand 10 is characterized by the following.

  Similarly to the above-described upper frame movement amount restriction unit 18, when a huge earthquake exceeding the assumed range occurs and excessive vibration energy is given to the vibration isolator 10, not only the upper frame movement amount restriction unit 18. The vibration absorber 22 is also damaged, and in the worst case, the vibration isolation function cannot be exhibited.

  Therefore, in the present invention, the movement allowed by the upper frame movement amount restricting portion 18 between the outer cylinder 70a loosely inserted inside the compression coil spring 66 and the inner surface of the outer cylinder 70a inside the vibration absorber 22. Since there is provided a vibration reducing mechanism 70 that is loosely inserted with a clearance C3 that is narrower than the distance and that has a lower mechanical strength than the outer cylinder 70a, the lower frame 14 and the upper frame The outer cylinder 70a and the inner cylinder 70b collide violently when the relative movement amount of the frame 16 in the horizontal direction is moved by a clearance C3 which is narrower than the movement distance allowed by the upper frame movement amount restricting portion 18. This means that the outer cylinder 70a and the inner cylinder 70b constituting the seismic reduction mechanism 70 collide at a stage where the acceleration at the initial stage of movement is small. At that time, the inner cylinder 70b having a low mechanical strength is deformed or broken, so that the seismic energy in the horizontal direction is reduced at the initial stage of movement. As a result, the regulation bolt 52, after the inner cylinder 70b is deformed or broken, Even if horizontal seismic energy is applied to the lower frame 14 and the upper frame, the energy no longer remains to damage the regulating bolt 52, the lower frame 14 or the upper frame 16, and damage due to these earthquakes. Can be exempted. As long as the regulation bolt 52, the lower frame 14, and the upper frame 16 are protected from breakage, the vibration absorber 22 can be reliably prevented from being damaged.

According to a third aspect of the present invention,
(1) a lower frame 14 installed on the load bearing surface 12, an upper frame 16 on which the mounting device M is placed, a vibration absorber 22 disposed between the lower frame 14 and the upper frame 16, In the anti-vibration mount 10 having the upper frame movement amount regulating unit 18 that regulates the movement amount of the upper frame 16 in the vertical and horizontal directions with respect to the lower frame 14,
(2) The upper frame movement amount regulating unit 18 is
A restriction bolt 52 provided on the lower frame 14 or the upper frame 16, and
An insertion hole 33 formed in the lower frame 14 or the upper frame 16 and through which the restriction bolt 52 is inserted with a gap d;
An upper frame movement amount regulating nut 60 screwed to the tip end portion of the regulating bolt 52 beyond the insertion hole 33 of the lower frame 14 or the upper frame 16;
It is made of at least one material selected from the group consisting of ceramics, glass, low-yield steel, and aluminum material, and the lower frame 14 is formed on the shaft portion between the lower frame 14 and the upper frame 16 of the regulation bolt 52. The upper frame 16 is held with a clearance C, and includes a regulation bolt 52, a lower frame 14, and a vibration reducing washer 20 having a lower mechanical strength than the upper frame 16,
(3) The vibration absorber 22 is
A compression coil spring 66 for carrying a load;
A lower case 62 attached to the lower portion of the compression coil spring 66;
An upper case 64 attached to an upper portion of the compression coil spring 66 and covering an upper surface and a side surface of the compression coil spring 66;
The outer cylinder 70a loosely inserted inside the compression coil spring 66 and at least one material selected from the group consisting of ceramics, glass, low yield steel and aluminum material, and the inner surface of the outer cylinder 70a A vibration-reducing mechanism 70 including an inner cylinder 70b that is loosely inserted with a clearance C3 narrower than a horizontal movement distance allowed by the upper frame movement restriction portion 18 therebetween and has a mechanical strength smaller than that of the outer cylinder 70a. The anti-vibration mount 10 is characterized by (4).

  In the vibration isolator of the present invention, even if a huge earthquake exceeding the expected range occurs, excessive vibration energy is caused by the vibration reducing action of the vibration reducing washer or the vibration reducing mechanism. Thus, it is possible to prevent the upper frame movement amount restricting portion and the vibration absorber from acting directly and to allow the upper frame movement amount restricting portion and the vibration absorber to function normally.

  In other words, according to the vibration isolator of the present invention, not only an earthquake resistant structure that resists earthquakes with the rigidity and strength of the members, but also a vibration isolator with an anti-vibration technology for reducing and mitigating the impact force caused by the earthquake is provided. be able to.

It is a front view which shows the use condition of the vibration isolator stand of one Example in this invention. It is a side view which shows the use condition of the vibration isolator stand of one Example in this invention. It is a bottom view which shows the vibration isolator stand of one Example in this invention. It is a top view which shows the vibration isolator of one Example in this invention. It is a figure which shows the corner part of the vibration isolator stand of one Example in this invention, (A) is a top view, (B) is BB sectional drawing in (A). In the figure which shows a vibration absorber, (A) is a partially cutaway cross-sectional view, and (B) is a BB cross-sectional view in (A). It is a figure which shows the corner part of the vibration isolator stand of the other Example in this invention, (A) is a top view, (B) is BB sectional drawing in (A).

  The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a front view showing a use state of a vibration isolator 10 according to an embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a bottom view, and FIG. As shown in these drawings, the anti-vibration stand 10 of this embodiment is configured to support the load M and the device M such as the vibration generating device in order to prevent the vibration generated from the vibration generating device such as the air conditioner outdoor unit from being transmitted to the foundation. The lower frame 14 installed on the load carrying surface 12, the upper frame 16 on which the device M is placed, and the lower frame 14 and the upper frame 16 are closely spaced. An upper frame movement amount restricting portion 18 connected as possible, a vibration reducing washer 20 attached to the upper frame movement amount restricting portion 18, and a vibration absorber 22 disposed between the lower frame 14 and the upper frame 16. It is roughly structured.

  As shown in FIG. 3, the lower frame 14 is configured in a substantially rectangular shape by four pipe-shaped members 24 having a substantially square cross section and four corner members 26 that join the pipe-shaped members 24 at the corners. ing. The length and thickness of the pipe-shaped member 24 can be appropriately changed according to the type, shape, weight, etc. of the device M placed and fixed on the upper frame 16. In this embodiment, two pipes facing each other The member 24 is longer and wider than the other two pipe members 24.

  As shown in FIGS. 3 and 5B, each corner member 26 has a first joining plate portion 28 to which the end of one pipe-like member 24 is joined, and an end of the other pipe-like member 24. It has the 2nd joining board part 30 joined, and the horizontal board part 32 which connects these in the upper part of the 1st joining board part 28 and the 2nd joining board part 30, and it has in the central part of the horizontal board part 32 Is formed with a lower insertion hole 34 which constitutes the upper frame movement amount regulating portion 18.

  As shown in FIG. 4, the upper frame 16 is formed in a substantially rectangular shape by four pipe members 36 having a substantially square cross section and four corner members 38 that join the pipe members 36 at corner portions. ing. The length and thickness of the pipe-shaped member 36 can be appropriately changed according to the type, shape, weight, etc. of the device M placed and fixed on the upper frame 16, similarly to the pipe-shaped member 24. Then, the two pipe-shaped members 36 facing each other are formed longer and wider than the other two pipe-shaped members 36.

  As shown in FIGS. 4 and 5B, each corner member 38 has a first joining plate portion 40 to which the end of one pipe-like member 36 is joined, and an end of the other pipe-like member 36. The second joining plate portion 42 to be joined, the horizontal joining portion 44 connecting them at the lower part of the first joining plate portion 40 and the second joining plate portion 42, the first joining plate portion 40 and the second joining plate portion 42. And an upper insertion hole 48 that forms the upper frame movement amount restricting portion 18 is formed in the central portion of the horizontal plate portion 44.

  As shown in FIG. 5, the upper frame movement amount restricting portion 18 includes a lower insertion hole 34 formed in the lower frame 16, an upper insertion hole 48 formed in the upper frame 18, the lower insertion hole 34, and the upper insertion hole 34. It is comprised with the connection metal fitting 50 with which the insertion hole 48 is mounted | worn.

  The connecting fitting 50 has a restriction bolt 52 that is inserted into the lower insertion hole 34 and the upper insertion hole 48, and the shape of the base portion of the restriction bolt 52 is a non-circular lower insertion hole. It is formed in a polygonal shape that can be fitted to 34 without rattling. As the restriction bolt 52, a general-purpose square root bolt can be used as it is. Further, the regulating bolt 52 has a gap between the upper insertion hole 33 (the lower insertion hole 48 in the example described later; simply referred to as the “insertion hole 33” when these are collectively referred to), through which the distal end side of the shaft portion is inserted. d is provided.

  Further, as shown in FIG. 5B, a washer 54, a fixing nut 56, two anti-vibration washers 20, a rubber bush 58 with a washer and an upper frame movement amount regulating nut 60 are regulated on the outer periphery of the regulating bolt 52. The bolts 52 are mounted in this order from the root.

  The washer 54 and the fixing nut 56 fix the regulating bolt 52 to the lower frame 16 by sandwiching the horizontal plate portion 32 in cooperation with the bolt head 52a. In the fixing portion of the restriction bolt 52 to the lower frame 16, the non-circular root portion of the restriction bolt 52 is fitted into the non-circular lower insertion hole 34. Therefore, the restriction bolt 52 is undesirably rotated by vibration or the like. There is no concern that the fixing nut 56 will loosen. Further, since the base portion of the restriction bolt 52 is supported straight by the inner surface of the lower insertion hole 34, the restriction bolt 52 can be passed straight without being inclined toward the center of the upper insertion hole 48. It is possible to prevent 52 from coming into contact with the inner surface of the upper insertion hole 48 and damaging the vibration isolation characteristics.

  The vibration reduction washer 20 is attached with a predetermined clearance C1 between the bottom surface of the upper insertion hole 48 provided in the horizontal plate portion 44, and the vibration reduction washer 20 is in contact with the bottom surface of the upper insertion hole 48. Thus, the upper frame 18 is prevented from swinging downward, and in the event of an earthquake, the member collides with the bottom surface of the upper insertion hole 48 and deforms or breaks itself, thereby attenuating the energy of the earthquake.

  This anti-seismic washer 20 is made of a crushable material such as ceramics or glass, which is destroyed when a certain level of stress is applied, or a metal material such as a low yield steel or aluminum material that is easily deformed. The bolt 52, the lower frame 14, and the upper frame 16 are configured to have a lower mechanical strength. A female screw is formed at the center of the bolt 52, and the female screw is screwed to the male screw of the regulating bolt 52. ing. Therefore, the height can be easily adjusted by rotating the vibration reducing washer 20.

  In the embodiment shown in FIGS. 1 to 5, the upper vibration reduction washer 20 is attached to the bottom surface of the upper insertion hole 48 with a predetermined clearance C1, and a predetermined clearance C2 is provided from the upper vibration reduction washer 20. A lower vibration reduction washer 20 is attached (the clearances C1 and C2 whose distances can be adjusted are collectively referred to as “clearance C”). That is, although the case where the upper and lower two-stage vibration reduction washers 20 are attached to the restriction bolts 52 is shown, the number of vibration reduction washers 20 attached to the restriction bolts 52 is a device that is placed and fixed on the upper frame 16. It can be appropriately changed according to the type, shape or weight of M, and may be one or three or more.

  In this embodiment, as the vibration reducing washer 20, a female screw is formed at the center and is screwed into the male screw of the restriction bolt 52. However, the vibration reducing washer 20 is a restriction bolt. Any structure can be used as long as it can be held on a predetermined portion of the shaft of 52. For example, a bolt insertion hole is formed in the center portion and the upper and lower surfaces are fixed with nuts between them. It may be a thing.

  The upper frame movement amount regulating nut 60 prevents the upper frame 16 from detaching from the regulating bolt 52 and suppresses upward deflection of the upper frame 16. It functions as a cushioning material between the 18 horizontal plate portions 44 and the upper frame movement amount regulating nut 60. The rubber bush 58 with a washer has a structure in which a rubber part 58b is attached to the lower surface of the washer part 58a, and the bending of the rubber part 58b is suppressed by the washer part 58a, and the upward deflection of the upper frame 18 is suppressed. Is done.

  The vibration absorber 22 has a function of absorbing vibrations transmitted from the vibration generating device to the upper frame 16, disturbances transmitted from the foundation to the lower frame 14, and the like, as shown in FIG. A lower case 62 fitted to the upper part of the member 24, an upper case 64 supporting the lower part of the pipe-shaped member 36 in the upper frame 16, a lower end fixed to the lower case 62, and an upper end fixed to the upper case 64 The compression coil spring 66, a surging preventing member 68 having a viscoelastic piece in contact with the compression coil spring 66, and an anti-vibration mechanism 70 described later. In the present embodiment, a total of four vibration isolation members 22 are arranged between the pipe-like member 24 constituting the long side of the lower frame 14 and the pipe-like member 36 constituting the long side of the upper frame 16. ing.

  The vibration reducing mechanism 70 has an upper frame moving amount between an outer cylinder 70a whose lower end is fixed to the lower case 62 and loosely inserted inside the compression coil spring 66, and an upper end fixed to the upper case 64 and the inner surface of the outer cylinder 70a. The inner cylinder 70b is loosely inserted with a predetermined clearance C3 narrower than the horizontal movement distance allowed by the restricting portion 18 and has a mechanical strength smaller than that of the outer cylinder 70a. The outer cylinder 70a and the inner cylinder 70b collide with each other and are deformed or damaged to attenuate earthquake energy. The inner cylinder 70b that attenuates the energy of the earthquake by being deformed or damaged as described above is destroyed when a certain level of stress such as ceramics or glass is applied, as in the case of the vibration reducing washer 20 described above. Or a metal material such as an easily deformable low yield steel or aluminum material.

  In this embodiment, the case where the lower end of the outer cylinder 70a is fixed to the lower case 62 and the upper end of the inner cylinder 70b is fixed to the upper case 64 is shown. However, the top and bottom of the outer cylinder 70a and the inner cylinder 70b are used. You may make it replace.

  When the vibration isolator 10 constructed as described above is used, as shown in FIGS. 1 and 2, the lower frame 14 is fixed to the load carrying surface 12 by anchor bolts or the like, and the upper frame 16 is vibrated on the upper surface. A device M such as a generating device is placed, and the device M is fixed to the upper frame 16 with a bolt or the like. And in order to exhibit the vibration absorption function of the vibration absorber 22 effectively, the height of the vibration reducing washer 20 and the upper frame movement amount regulating nut 60 is adjusted. That is, as shown in FIG. 5, a predetermined clearance C1 (for example, a 2 mm thick vibration reducing washer 20 is used between the bottom surface of the horizontal plate portion 44 of the upper frame 16 and the upper vibration reducing washer 20 is used. A clearance C1 of about 2 mm is provided). Further, a clearance C2 of the same degree as the clearance C1 is also provided between the upper and lower vibration reduction washers 20.

  As described above, in the vibration isolator 10 in which the clearance C is ensured, the vibration generated by the vibration generating device and the disturbance from the foundation are absorbed by the vibration absorber 22 and the vibration isolating function is exhibited. When the device M placed on the upper frame 16 vibrates excessively due to a huge earthquake or the like, the vibration energy of the earthquake is attenuated by breaking or deforming the vibration reducing washer 20 or the vibration reducing mechanism 70 as described above. It is possible to prevent the upper frame movement amount restricting portion 18 and the vibration absorber 22 from being damaged.

  In the above-described embodiment, an example is shown in which the regulating bolt 52 is fixed to the horizontal plate portion 32 of the lower frame 14, but the regulating bolt 52 is attached to the horizontal plate portion 44 of the upper frame 16 as shown in FIG. It may be fixed. In this case, the upper insertion hole 48 of the upper frame 16 is fitted to the base portion of the restriction bolt 52, and a predetermined clearance C1 is provided between the vibration reducing washer 20 and the top surface of the lower insertion hole 34. Will be provided.

  Moreover, although the case where the vibration reduction washer 20 and the vibration reduction mechanism 70 are used simultaneously is shown, either the vibration reduction washer 20 or the vibration reduction mechanism 70 is provided according to the magnitude of the assumed earthquake. Also good.

DESCRIPTION OF SYMBOLS 10 ... Anti-vibration stand 12 ... Load carrying surface 14 ... Lower frame 16 ... Upper frame 18 ... Upper frame movement amount control part 20 ... Anti-vibration washer 22 ... Damping body 24, 36 ... Pipe-shaped member 26, 38 ... Corner member 32 44 ... Horizontal plate portion 33 ... Insertion hole 34 ... Lower insertion hole 46 ... Reinforcing plate material 48 ... Upper insertion hole 50 ... Connecting bracket 52 ... Restriction bolt 56 ... Fixed nut 58 ... Rubber bush 60 with washer 60 ... Upper frame movement amount restriction nut 62 ... Lower case 64 ... Upper case 66 ... Compression coil spring 68 ... Surging prevention member 70 ... Anti-vibration mechanism 70a ... Outer cylinder 70b ... Inner cylinder M ... Equipment

Claims (3)

A lower frame installed on the load bearing surface, an upper frame on which the mounted device is placed, a vibration absorber disposed between the lower frame and the upper frame, and the upper frame with respect to the lower frame. In the anti-vibration stand having the upper frame movement amount regulating unit for regulating the movement amount in the vertical and horizontal directions,
The upper frame movement amount regulating unit is
Restriction bolts provided on the lower frame or the upper frame;
An insertion hole formed in the lower frame or the upper frame, through which the restriction bolt is inserted with a gap;
An upper frame movement amount regulating nut screwed to a tip end portion of a regulating bolt beyond the insertion hole of the lower frame or the upper frame;
It is made of at least one material selected from the group consisting of ceramics, glass, low yield steel and aluminum material, and the lower frame and the upper frame are formed on the shaft portion between the lower frame and the upper frame of the regulation bolt. An anti-vibration stand comprising a regulation bolt, a lower frame, and a vibration reducing washer having a lower mechanical strength than the upper frame. A lower frame installed on the load bearing surface, an upper frame on which the mounted device is placed, a vibration absorber disposed between the lower frame and the upper frame, and the upper frame with respect to the lower frame. In the anti-vibration stand having the upper frame movement amount regulating unit for regulating the movement amount in the vertical and horizontal directions,
The vibration absorber is
A compression coil spring for carrying a load;
A lower case attached to a lower portion of the compression coil spring;
An upper case attached to an upper portion of the compression coil spring and covering an upper surface and a side surface of the compression coil spring;
The outer cylinder loosely inserted inside the compression coil spring, and made of at least one material selected from the group consisting of ceramics, glass, low yield steel and aluminum material, and between the inner surface of the outer cylinder It is composed of an anti-vibration mechanism having an inner cylinder that is loosely inserted with a clearance smaller than the horizontal movement distance allowed by the upper frame movement amount restricting portion and that has a mechanical strength smaller than that of the outer cylinder. Anti-vibration stand that features. A lower frame installed on the load bearing surface, an upper frame on which the mounted device is placed, a vibration absorber disposed between the lower frame and the upper frame, and the upper frame with respect to the lower frame. In the anti-vibration stand having the upper frame movement amount regulating unit for regulating the movement amount in the vertical and horizontal directions,
The upper frame movement amount regulating unit is
Restriction bolts provided on the lower frame or the upper frame;
An insertion hole formed in the lower frame or the upper frame, through which the restriction bolt is inserted with a gap;
An upper frame movement amount regulating nut screwed to a tip end portion of a regulating bolt beyond the insertion hole of the lower frame or the upper frame;
It is made of at least one material selected from the group consisting of ceramics, glass, low yield steel and aluminum material, and the lower frame and the upper frame are formed on the shaft portion between the lower frame and the upper frame of the regulation bolt. It consists of a regulation bolt, a lower frame and a vibration reducing washer with a lower mechanical strength than the upper frame.
The vibration absorber is
A compression coil spring for carrying a load;
A lower case attached to a lower portion of the compression coil spring;
An upper case attached to an upper portion of the compression coil spring and covering an upper surface and a side surface of the compression coil spring;
The outer cylinder loosely inserted inside the compression coil spring, and made of at least one material selected from the group consisting of ceramics, glass, low yield steel and aluminum material, and between the inner surface of the outer cylinder It is composed of an anti-vibration mechanism having an inner cylinder that is loosely inserted with a clearance smaller than the horizontal movement distance allowed by the upper frame movement amount restricting portion and that has a mechanical strength smaller than that of the outer cylinder. Anti-vibration stand that features.