JP2007298154A - Vibration proof pedestal and vibration proof tool used for vibration proof pedestal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration proof pedestal capable of reducing the thickness and a vibration proof tool with excellent versatility used for the vibration proof pedestal and capable of being used as a unit body. <P>SOLUTION: A foundation bolt insertion hole 44 is formed in a lower plate 30 of the vibration proof tool 14, and the vibration proof tool 14 can be directly attached to a foundation Y. Therefore, a new type vibration proof pedestal which did not conventionally exist, that is, the vibration proof pedestal 10 having no lower pedestal can be provided, and the lower pedestal is not required, and thereby, the thickness of the vibration proof pedestal 10 can be reduced. The lower plate 30 and an upper casing 32 constituting the respective vibration proof tools 14 are connected by a stopper 34, and thereby, the vibration proof tool 14 is not dismantled even when force pulling the vibration proof pedestal 10 in the vertical direction is imparted to the vibration proof tool 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is interposed between a foundation such as a building and a vibration generation source such as a mechanical device and prevents vibration from the vibration generation source from being transmitted to the foundation, and the vibration isolation base. It is related with the vibration isolator used.

  Conventionally, in order to prevent the vibration generated from the vibration source from being transmitted to the foundation or in the case of precision equipment, to prevent disturbance from the foundation, an anti-vibration stand is interposed between the vibration source and the foundation. It has been generally performed (see, for example, Patent Document 1).

  This conventional vibration isolation frame includes a rectangular frame-shaped upper frame that is attached to a vibration source, a rectangular frame-shaped lower frame that is mounted on a foundation, and a vibration isolator provided between the upper frame and the lower frame. It is generally composed of a stopper that regulates the amount of horizontal displacement between the upper frame and the lower frame.

The vibration isolator is roughly composed of an upper case with an inverted cup shape on the lower surface opening, a lower case with an upper surface cup shape, and a spring body provided between the upper case and the lower case. Vibration generated from the vibration source by force can be absorbed.
JP 2001-304335 A

  In order to more stably place the vibration source in the vibration isolator having such a structure, it is necessary to lower the center of gravity. From this viewpoint, it is required to make the vibration isolator thin. However, the anti-vibration frame has a very simple structure in which a vibration isolator is arranged between the upper frame and the lower frame, and the upper frame is fixed to the vibration source and the lower frame is fixed to the foundation. Therefore, it has been considered difficult to reduce the thickness by reducing the number of parts. In addition, if the thickness reduction is pursued too much, the seismic strength of the anti-vibration stand itself (the strength of the base material that can withstand the forces in the horizontal direction, compression direction, tensile direction, and bending direction applied to the anti-vibration stand) is maintained. This was also one of the factors considered to be difficult to reduce the thickness by reducing the number of parts.

  The upper frame and the lower frame are constructed by combining four square pipes into a rectangular frame shape. When each member is connected by welding, the central part is used for transporting the vibration isolation frame. There is a problem that the space becomes a dead space and the transportation cost increases. On the other hand, when the members are connected by fastening means such as bolts and nuts, the above-mentioned problem can be solved because the upper frame and the lower frame can be disassembled and transported. However, there is a problem that the bolts and nuts loosen during long-term use due to vibrations generated from the vibration source, causing rattling.

  Furthermore, the upper frame is originally provided for the installation of the vibration generation source. However, when the installation of the vibration isolation frame has become common sense as recently, for example, an air conditioner manufacturer Therefore, in order to design the external device with the above-mentioned combination in mind, an attempt is made to reduce the weight of the portion that secures the rigidity of the external device (for example, a housing) by subtracting the rigidity of the upper frame. For this reason, the rigidity of the upper base of recent anti-vibration bases has been designed taking into account the small rigidity of the external device that is the source of vibration, and basically the anti-vibration base is indispensable. It has become.

  On the other hand, when sufficient rigidity is ensured in the casing of the vibration source, an upper frame for increasing the rigidity of the vibration source is not necessary, and a protection is provided between the vibration source and the foundation. It is sufficient to intervene directly with a shaker (direct installation type vibration isolator).

  However, when trying to use such a direct installation type vibration isolator, the direct installation type vibration isolation device is arranged between the upper housing attached to the casing of the vibration source and the lower housing directly fixed to the foundation. In such a simple structure, the force in the compression direction is extremely high, and the seismic strength against the force in the horizontal (shearing) and tensile (bending) directions is extremely high. However, it is impossible to use in a direct installation type.

  Therefore, an object of the present invention is to provide a vibration isolator that can be made thinner.

  Another object of the present invention is to provide an anti-vibration stand that can reduce the transportation cost and the manufacturing cost during transportation, and that does not rattle during use, particularly for long-term use.

  Still another object of the present invention is to provide a vibration isolator having excellent versatility that can be used as a single unit as well as attached to a vibration isolator.

  The invention according to claim 1 is a vibration isolator 10 comprising an upper frame 12 on which the vibration source X is placed and a plurality of vibration isolators 14 attached to the upper frame 12. Each vibration isolator 14 includes a lower plate 30 having two base bolt insertion holes 44 and two stopper bolt fixing holes 38a, and two guide holes 48 provided at positions corresponding to the stopper bolt fixing holes 38a. The upper casing 32, the vibration absorbing member 36 disposed between the lower plate 30 and the upper casing 32, and the stopper having the lower end fixed to the stopper bolt fixing hole 38a and the upper end inserted into the corresponding guide hole 48. It has a stopper 34 having a bolt 52 and a nut 60 screwed into a portion protruding above the guide hole 48 of the stopper bolt 52 ". It is a vibration-proof table 10, butterfly.

  In the present invention, since the base bolt insertion hole 44 is formed in the lower plate 30 of each vibration isolator 14, and the vibration isolator 14 can be directly attached to the foundation Y, it is considered necessary in the past. Therefore, it is possible to provide the anti-vibration frame 10 having no lower frame.

  In addition, since the lower plate 30 and the upper casing 32 constituting each vibration isolator 14 are connected by the stopper 34, the above-described moment force is generated in the vibration isolator 10 and the vibration isolator 10 is mounted. Even if a force for pulling in the vertical direction is applied, the vibration isolator 14 is not disassembled.

  The invention according to claim 2 is characterized in that “the basic bolt insertion hole 44 is formed inside a circle having a diameter that is a straight line connecting the stopper bolt fixing holes 38a”. .

  Of the force applied to the vibration isolator 10, the vibration absorbing member 36 carries the force applied in the horizontal direction and the force compressing the vibration isolator 10. On the other hand, with respect to the force in the direction of pulling up the vibration isolator base 10, the strength of the lower plate 30 of the vibration isolator 14, that is, the portion in direct contact with the foundation Y becomes a problem.

  Here, paying attention to the lower plate 30, when a force in the direction of pulling the vibration isolator 10 upward is applied to the lower plate 30, the lower plate 30 has a stopper bolt fixing hole 38 a as a power point, and a basic bolt A force with the insertion hole 44 as a fulcrum is applied.

  In the present invention, the distance between the fulcrums (that is, the distance between the foundation bolt insertion holes 44) is set to be shorter than the distance between the force points (that is, the distance between the stopper bolt fixing holes 38a). Compared with the case where the distance is set longer than the distance between the power points, the strength of the lower plate 30 can be increased.

  The invention according to claim 3 is: "The upper frame 12 is disposed so as to face each other so as to sandwich the pair of first frame members 12a and the pair of first frame members 12a. The pair of second frame constituent members 12b are combined in a rectangular frame shape, and are used for fixing plate-like bolts having screw holes 22b in the vicinity of the opening ends of the first frame constituent members 12a. A plate 22 is provided, and fixing bolt insertion holes 20 are formed at both end portions of the side surface of each second frame constituent member 12b, and are inserted into the holes 20 formed in the second frame constituent member 12b. The tip of the fixing bolt 24 is screwed into the screw hole 22 b of the bolt fixing plate 22.

  In the present invention, the upper frame 12 can be easily disassembled by releasing the screwed state between the bolt fixing plate 22 and the fixing bolt 24, and therefore, a conventional dead space is generated when the vibration isolating frame 10 is transported. No, the transportation cost can be kept low.

  On the other hand, when the upper frame 12 is assembled by screwing the bolt fixing plate 22 and the fixing bolt 24, the tip of the fixing bolt 24 is screwed into the screw hole 22 b of the bolt fixing plate 22 to fix the bolt. The plate 22 is pulled toward the fixing bolt 24 and is bent, and this bending force functions as a “loosening prevention” between the bolt fixing plate 22 and the fixing bolt 24. Therefore, when the vibration isolator 10 is used, the fixing bolt 24 is not loosened by the vibration of the vibration source X, and the upper base 12 can be prevented from rattling.

  The invention according to claim 4 is: "Two guides provided at positions corresponding to the lower plate 30 having two base bolt insertion holes 44 and two stopper bolt fixing holes 38a and the stopper bolt fixing holes 38a". The upper casing 32 having the hole 48, the vibration absorbing member 36 disposed between the lower plate 30 and the upper casing 32, and the lower end are fixed to the stopper bolt fixing hole 38a, and the upper end is inserted into the corresponding guide hole 48. The vibration isolator 14 includes a stopper 34 having a stopper bolt 52 and a nut 60 screwed into a portion protruding above the guide hole 48 of the stopper bolt 52.

  According to the present invention, the vibration isolator 14 itself is provided with a stopper function, and the seismic strength against the force in the horizontal (shearing) direction and the tension (bending) direction can be secured. In addition to being used as a component, it is possible to use the vibration isolator alone (that is, to be used by being directly disposed between the vibration source X and the foundation Y).

  According to the first to third aspects of the present invention, it is possible to provide a vibration isolator having a reduced thickness because there is no lower frame. In addition, according to the invention described in claim 4, it is possible to provide a vibration isolator having excellent versatility that can be used as a single unit as well as being used as a component of a vibration isolating stand.

  The present invention will be described below with reference to the drawings. The vibration isolator 10 is interposed between a vibration source X such as a mechanical device and a foundation Y (see FIG. 3), and prevents vibration generated from the vibration source X from being transmitted to the foundation Y. As shown in FIGS. 1 to 2, the upper frame 12 and the vibration isolator 14 are generally configured.

  The upper frame 12 is for increasing the strength of the base material of the vibration source X placed on the upper surface thereof, and has two first frame configurations formed by elongated rod-like members (for example, square pipes). It is comprised from the material 12a and the two 2nd frame component 12b which connects the both ends of the two said 1st frame component 12a, The said 1st frame component 12a and the 2nd frame component 12b are rectangles ( The frame is arranged in a square shape or a required shape, and both members are fixed by the fixing means 16.

  In both end portions of the first frame constituent member 12a, saddle holes 18 are formed in the left and right side surfaces, respectively. Here, each of the daruma holes 18 is set such that the diameter of the first frame component 12a far from the opening end is larger than the diameter of the opening end.

  On the other hand, bolt insertion holes 20 are formed on both left and right side surfaces of both ends of the second frame component 12b. Further, a vibration isolator mounting hole 21 extending from the upper surface to the lower surface is formed at the center side of the second frame constituting member 12b from the position where the bolt insertion hole 20 is formed.

  The fixing means 16 includes a bolt fixing plate 22 and a fixing bolt 24. The bolt fixing plate 22 is a flat plate member having a cross-sectional shape that can be inserted into the daruma hole 18, and convex portions 22 a are formed at both ends in the width direction. Note that the outer shape of the convex portion 22 a is set slightly smaller than the inner diameter of the small diameter side portion of the daruma hole 18. A screw hole 22 b is screwed in the center of the bolt fixing plate 22.

  When the upper frame 12 is formed, the two first frame constituent members 12a are arranged so as to face each other, and the two second frame constituent members 12b are sandwiched between the first frame constituent members 12a. Deploy.

  Next, the bolt fixing plate 22 is inserted into the daruma hole 18, and the bolt fixing plate 22 is rotated 90 degrees about the convex portion 22a (the screw hole 22b formed in the bolt fixing plate 22 is It faces the opening side of the first frame constituent member 16a.) The bolt fixing plate 22 is placed at the opening end of the first frame constituent member 16a along the projection hole 22a of the bolt fixing plate 22 along the slack hole 18. Slide to the side.

  Next, the fixing bolt 24 is inserted into the hole 20 of the first frame constituent member 16 a, and the tip of the fixing bolt 24 is brought into contact with the screw hole 22 b of the bolt fixing plate 22. Then, as the fixing bolt 24 is tightened, the first frame constituent member 16a and the second frame constituent member 16b are firmly fixed, whereby the upper frame 12 is completed.

  When the fixing bolt 24 is screwed into the screw hole 22b of the bolt fixing plate 22, the bolt fixing plate 22 is pulled toward the fixing bolt 24 and bends, and the bending force generated at this time is applied to the fixing bolt 24. That is, the fixing bolt 24 and the bolt fixing plate 22 are subjected to a force in the direction of pulling each other, and this force functions as a locking prevention for the fixing bolt 24.

  As shown in FIGS. 4 to 6, the vibration isolator 14 is roughly configured by a lower plate 30, an upper casing 32, a stopper 34, and a vibration absorbing member 36.

  The lower plate 30 is a plate-like member made of a highly rigid material such as iron and formed in a substantially oval shape (see FIG. 7).

  Swelling portions 38 are formed by pressing at both ends in the longitudinal direction of the lower plate 30, and stopper bolt fixing holes 38 a for fixing stopper bolts 52, which will be described later, are formed at the tops of the respective rising portions 38. It has been drilled. The inner peripheral shape of the stopper bolt fixing hole 38a is a square shape. However, the inner peripheral shape of the stopper bolt fixing hole 38a is not limited to a rectangular shape as long as it is a non-circular shape, and may be an elliptical shape or other polygonal shapes such as a triangular shape or a pentagonal shape. It may be.

  A fixing hole 40 for fixing the vibration absorbing member 36 is formed in the center of the lower plate 30, and the vibration absorbing member 36 is prevented from rotating in the vicinity of the fixing hole 40. An anti-rotation hole 42 is provided for this purpose. The fixing hole 40 is provided at the center position of the two stopper bolt fixing holes 38a.

  Further, in the vicinity of the raised portion 38 of the lower plate 30, two holes 44 for inserting foundation bolts installed on the foundation Y are formed. The foundation bolt insertion hole 44 is drilled so that the center thereof is located inside a circle having a diameter that is a straight line connecting the stopper bolt fixing holes 38a (a portion indicated by a one-dot chain line in FIG. 7). Is preferred.

  Explaining this point, as shown in FIG. 8, when a base bolt insertion hole 44 is formed inside a circle whose diameter is a straight line connecting the stopper bolt fixing holes 38a (FIG. 8A; this embodiment). And the strength test of the lower plate 30 (foundation bolt insertion) when the foundation bolt insertion hole 44 is drilled outside the circle whose diameter is a straight line connecting the stopper bolt fixing holes 38a (FIG. 8B; comparative example). The amount of deformation of the lower plate 30 was measured using the common hole 44 as a fulcrum and the stopper bolt fixing hole 38a as a force point. As shown in FIG. It was found that the amount was smaller and the strength was higher (the maximum displacement was 1.7 mm for the former, 2.1 mm for the latter. The permanent distortion was 0.23 mm for the former. Whereas the latter It was 0.64mm.).

  The upper casing 32 is made of a high-rigidity material such as iron and has a bowl-like shape with an open bottom surface, and a vibration absorbing member accommodating portion 32a having a substantially circular cross section is formed at the center by deep drawing. In addition, two stopper mounting portions 32b extending in the lateral direction are formed at positions facing each other at the lower end portion of the vibration absorbing member accommodating portion 32a.

  A hole 46 is formed in the upper surface of the vibration absorbing member accommodating portion 32a, and a guide hole 48 is formed in the upper surface of the stopper mounting portion 32b.

  A mounting bolt 50 is inserted into the hole 46 of the vibration absorbing member accommodating portion 32a from the back side, and the mounting bolt 50 is fixed to the vibration absorbing member accommodating portion 32a by fixing means such as welding. Yes. The mounting bolt 50 functions as a connecting means between the upper mount 12 and the vibration isolator 14.

  The stopper 34 includes a stopper bolt 52, a rubber bush 54, a flat washer 56 (56a, 56b), a spacer 58, and a nut 60 (60a, 60b).

  The stopper bolt 52 is a so-called square root bolt in which the cross-sectional shape of the root portion of the male screw is formed in a substantially square shape in accordance with the inner peripheral shape of the stopper bolt fixing hole 38a. By fitting in the stopper bolt fixing hole 38a, the stopper bolt 52 can be prevented from rotating together.

  The rubber bush 54 is a ring-shaped member made of an elastic material such as rubber, and the inner diameter thereof is set to be approximately equal (or slightly larger) to the outer shape of the spacer 58 described later. When the rubber bush 54 is attached to the guide hole 48 formed on the upper surface of the stopper mounting portion 32b, the inner surface of the guide hole 48 and the upper and lower surfaces of the stopper mounting portion 32b in the vicinity of the guide hole 48 are the rubber bush 54. It will be covered with.

  The flat washers 56 (56a, 56b) are ring-shaped members made of metal such as iron or stainless steel, and the inner diameter of the flat washers 56a is set slightly larger than the outer diameter of the bolt portion of the stopper bolt 52. The inner diameter of the flat washer 56b is set to be approximately equal (or slightly larger) to the outer shape of the spacer 58 described later.

  The spacer 58 is a cylindrical member made of a slippery material such as PTFE (tetrafluoroethylene) “for example, Teflon (registered trademark)”, and its outer diameter is set to be substantially equal to (or slightly smaller than) the inner diameter of the hole 28b. The inner diameter is set to be slightly larger than the outer diameter of the bolt portion of the stopper bolt 52.

  The vibration absorbing member 36 absorbs vibration by elasticity, and includes a coil spring 62, a cup-shaped upper fixing member 64 attached to the upper end of the coil spring 62, and a lower fixing member 66 fixed to the lower end of the coil spring 62. And a cylindrical eye that is attached to the lower fixing member 66 and surrounds the lower end portion of the coil spring 62 (referred to as a portion that can be seen from the front when the vibration isolator 10 is assembled) and the periphery of the lower fixing member 66. It is comprised with the hidden member 68. FIG.

  A fixing convex portion 66a protrudes downward from a central portion of the bottom surface of the lower fixing member 66, and an anti-rotation convex portion (not shown) is formed in the vicinity of the fixing convex portion 66a. .

  Note that the vibration isolation performance of the vibration absorbing member 36 can be appropriately set by changing the wire diameter, the number of turns, the material, or the like of the coil spring 62 that is an elastic body. Further, a cylindrical rubber member may be used instead of the coil spring 62, or a combination of the coil spring 62 and the rubber member may be used as an elastic body.

  When assembling the vibration isolator 14, first, the vibration absorbing member 36 is disposed on the upper surface of the lower plate 30, and the fixing convex portion 66a formed on the lower surface of the lower fixing member 66 and the rotation preventing convex portion ( (Not shown) are fitted in the fixing hole 40 and the rotation preventing hole 42 of the lower plate 30, respectively. Further, a rubber bush 54 constituting the stopper 34 is attached to the guide hole 48 of the upper case.

  Next, the stopper bolt 52 is inserted into the stopper bolt fixing hole 38a formed in the raised portion 38 of the lower plate 30 from the lower surface side of the lower plate 30, and the base portion (square root portion) of the stopper bolt 52 is inserted into the stopper bolt. It fits in the fixing hole 38a. Then, the flat washer 56a is attached to the stopper bolt 52 from the upper surface side of the lower plate 30, and the lower plate 30 and the stopper bolt 52 are fixed using the nut 60a.

  Next, the spacer 58 is attached to the stopper bolt 52, and then the upper casing 32 is attached (at this time, the stopper bolt 52 is inserted into the hole of the rubber bush 54 attached to the guide hole 48).

  Finally, if the flat washer 56b and the nut 60b are attached to the stopper bolt 52 in this order, the vibration isolator 14 is completed. In this embodiment, since the spacer 58 is attached to the stopper bolt 52, the position of the nut 60b can be determined simply by screwing the nut 60b to a position where the bottom surface of the nut 60b contacts the top surface of the spacer 58. Therefore, it is unnecessary to adjust the position of the upper nut 60b, which has been conventionally performed to define the upper limit position of the upper casing 32. In addition, since the spacer 58 is formed of a slippery material, the frictional resistance when contacting the rubber bush 54 is small, and accordingly, the vibration absorbing characteristics of the vibration absorbing member 36 can be prevented from being impaired.

  When assembling the vibration isolation frame 10 using the upper frame 12 and the vibration isolation device 14 obtained as described above, the four vibration isolation devices 14 are arranged below the upper frame 12 to form the second frame configuration. The mounting bolt 50 for the vibration isolator 14 is inserted into the vibration isolator mounting hole 21 of the material 12b. Then, by attaching the nut 70 to the mounting bolt 50 from the upper surface side of the upper frame 12, the vibration isolation frame 10 is completed. Although not shown, the mounting positions of the mounting bolt 50 and the nut 70 may be reversed.

  When the vibration isolator 10 is used, the vibration isolator 10 may be interposed between the vibration source X and the foundation Y (see FIG. 3).

  At this time, if the foundation bolt 72a is provided on the foundation Y, the foundation bolt 72a is inserted into the foundation bolt insertion hole 44 of the lower plate 30, and the nut 72b is screwed onto the foundation bolt 72a, the vibration isolator base 10 can be used as the foundation. Can be fixed to Y. Further, if the mounting portion 74 provided on the vibration generating source X is mounted between the upper mount 12 and the nut 70, the vibration generating source X can be fixed to the vibration isolating mount 10.

  When the vibration source X is operated, the upper frame 12 vibrates vertically and horizontally in accordance with the movement of the vibration source X. Then, the vibration isolator 14 absorbs the vibration and can prevent the vibration of the vibration source X from being transmitted to the foundation Y.

  When a horizontal force and a downward force (that is, a force in the direction of compressing the vibration isolator 10) are applied to the vibration isolator 10, the vibration absorbing member 36 of the vibration isolator 14 absorbs the vibration. it can. On the other hand, when a large horizontal force is applied to the upper case 12 and a large upward force is applied to a certain vibration isolator 14, the upper casing 32 of the vibration isolator 14 is separated from the lower plate 30. When the displacement amount is excessive when displaced in the direction of separating, the upper casing 32 stops at a position where it abuts against the nut 60 constituting the stopper 34. At this time, a bending force is applied to the lower plate 30 with the foundation bolt insertion hole 44 as a fulcrum and the stopper bolt fixing hole 38a as a power point (see FIG. 8A).

  Here, in the vibration isolator 14 of the present embodiment, since the base bolt insertion hole 44 is formed inside a circle having a diameter that is a straight line connecting the stopper bolt fixing holes 38a, the stopper bolt fixing hole 38a. The strength of the lower plate 30 can be increased as compared with the case where the base bolt insertion hole 44 is formed outside the circle whose diameter is a straight line connecting each other.

  In the above-described embodiment, vibrations generated from the vibration source X are prevented from being transmitted to the base Y by interposing the vibration isolator 10 between the base Y and the vibration source X. However, when the base material strength of the vibration source X is sufficiently secured, the vibration isolator 14 may be directly interposed between the foundation Y and the vibration source X.

  According to this embodiment, the vibration isolator 14 itself is provided with a stopper function, and the seismic strength against the force in the horizontal direction and the tensile direction can be secured, so that the vibration isolator 14 can be used alone. Therefore, it is possible to use one type of vibration isolator 14 as a part of the vibration isolator base 10 according to the type of the vibration generating source X, or to use the vibration isolator 14 alone.

It is a top view which shows the vibration isolator stand concerning this invention. It is a side view of the FIG. 1 embodiment. It is a figure which shows a use condition. It is a front view which shows a vibration isolator. It is sectional drawing of a vibration isolator. It is a top view of a vibration isolator. It is a figure which shows a lower case. It is a figure which shows the positional relationship of a foundation bolt attachment position and a stopper bolt fixing hole. It is the strength test result of a vibration isolator by the difference in a foundation bolt attachment position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Anti-vibration stand 12 ... Upper stand 14 ... Anti-vibration tool 30 ... Lower case 32 ... Upper case 34 ... Stopper 36 ... Vibration absorption member 38a ... Stopper bolt fixing hole 44 ... Foundation bolt insertion hole X ... Vibration source Y … Basic

Claims (4)

An anti-vibration gantry comprising an upper gantry on which a vibration generation source is placed, and a plurality of anti-vibration tools attached to the upper gantry,
Each vibration isolator is
(a) a lower plate having two holes for inserting a base bolt and two holes for fixing a stopper bolt,
(b) an upper casing having two guide holes provided at positions corresponding to the stopper bolt fixing holes;
(c) a vibration absorbing member disposed between the lower plate and the upper casing, and
(d) a stopper bolt having a lower end fixed to the stopper bolt fixing hole and an upper end inserted through the corresponding guide hole;
(e) A vibration-proof stand having a stopper having a nut screwed into a portion of the stopper bolt protruding above the guide hole.   The anti-vibration mount according to claim 1, wherein the base bolt insertion hole is formed inside a circle having a diameter that is a straight line connecting the stopper bolt fixing holes. The upper frame includes a pair of first frame constituent members arranged to face each other, and a pair of second frame constituent members arranged to face each other so as to sandwich the pair of first frame constituent materials. It is formed by combining in a rectangular frame shape,
A plate-like bolt fixing plate having a screw hole is provided in the vicinity of the opening end of each first frame constituent material,
Holes for inserting fixing bolts are formed at both side end portions of each second frame constituent material,
The anti-vibration stand according to claim 1 or 2, wherein a front end of a fixing bolt inserted into a hole formed in the second frame constituent member is screwed into a screw hole of the bolt fixing plate. . A lower plate having two holes for inserting base bolts and two holes for fixing stopper bolts,
An upper casing having two guide holes provided at positions corresponding to the stopper bolt fixing holes;
A vibration absorbing member disposed between the lower plate and the upper casing; a stopper bolt having a lower end fixed to the stopper bolt fixing hole and an upper end inserted into the corresponding guide hole; and the stopper bolt A vibration isolator comprising a stopper having a nut screwed into a portion protruding above the guide hole.

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