JP2015105704A - Vibration absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration absorber that can effectively prevent overturn or damage of facility equipment by effectively absorbing vibration in a horizontal direction, even in a case where extremely large horizontal force is applied to an upper frame.SOLUTION: To the upper part of a locking cylindrical part 14e, horizontal load absorption members 20, 20', which absorb a load in a horizontal direction and on the upper surface of which an engagement hole 20c is formed, are attached. From the ceiling plane of an upper case 16, an engagement projection 16c is suspended. In a state where vibration absorbers 10, 10' are deflected by pressing force in a vertical direction, at least the tip of the engagement projection 16c is loosely fitted to the engagement hole 20c of the horizontal load absorption members 20, 20'.

Description

  The present invention relates to an improvement of a vibration absorber attached to a vibration isolator such as a vibration isolator.

  In order to prevent vibration generated from equipment such as outdoor units from being transmitted to the installation surface, it is common practice to install a vibration isolation device such as a vibration isolation stand between the equipment and the installation surface. ing.

  As shown in FIG. 9, the vibration isolator 1 includes a rectangular frame-shaped lower frame 2 installed on the installation surface G, a rectangular frame-shaped upper frame 3 on which the equipment X is placed, an upper frame 3 and a lower frame. A vibration absorber 4 provided between the gantry 2 and the gantry 2 is provided. At each corner of the lower pedestal 2, it is erected from the lower pedestal 2, loosely fitted in a through hole (not shown) drilled in the upper pedestal 3, and an upper limit regulating nut 5 a A stopper 5 screwed to the upper part is provided, whereby the vertical and horizontal movements of the upper frame 3 relative to the lower frame 2 are restricted within a predetermined range.

  As an example of the vibration absorber 4, for example, the vibration absorber 4 disclosed in Japanese Patent Laid-Open No. 2006-200734 (Patent Document 1) can be given. Here, the structure of the conventional vibration absorber 4 will be briefly described. As shown in FIG. 10, the vibration absorber 4 is provided at a load carrying compression coil spring 6 and a lower portion of the compression coil spring 6. A lower case 7 mounted at a predetermined position on the lower frame 2 via a hanging piece 7a, and an upper case 8 attached to the lower case 7 so as to cover the compression coil spring 6 and on which the upper frame 3 is placed. It consists of and.

  A surging prevention member 9 made of a visco-soft material is disposed inside the compression coil spring 6, and the viscoelastic piece 9 a of the surging prevention member 9 is in contact with the compression coil spring 6.

  Vibration (swaying) generated from the equipment X is transmitted from the upper frame 3 to the vibration absorber 4 and is blocked by the bending of the compression coil spring 6. This vibration generated from the equipment X may cause surging of the compression coil spring 6 in some cases. This surging causes internal damping of the viscoelastic piece 9a installed in contact with the compression coil spring 6. Is effectively absorbed, and the compression coil spring 6 operates normally. Thereby, it is possible to reliably block the vibration from being transmitted to the installation surface G.

Japanese Patent Laying-Open No. 2006-200734 (FIGS. 1 and 3)

  Since the vibration isolator 1 on which the equipment X is mounted is elastically supported by the vibration absorber 4, when the horizontal vibration due to the earthquake is applied to the vibration isolator 1, the lower frame 2 is moved with respect to the upper frame 3. The vibration is suppressed by the horizontal deflection of the compression coil spring 6 inside the vibration absorber 4 within the range of the restriction amount by the stopper 5.

  However, when a huge earthquake hits, the lower pedestal 2 reciprocates horizontally in the horizontal direction with respect to the upper pedestal 3, and as a result, the upper pedestal 3 shakes greatly with the equipment X with rolling. When the shaking exceeds the amount regulated by the stopper 5, the horizontal shaking of the upper frame 3 cannot be suppressed only by the horizontal deflection of the compression coil spring 6, and the stopper 5 can reciprocate in the through hole of the upper frame 3. Clash and apply great force to stopper 5. When the impact force exceeds the mechanical strength of the stopper 5, if the stopper 5 is bent or severe, breakage or the like may occur, resulting in a problem that the equipment or equipment falls down or breaks down.

  The present invention has been made in view of such conventional problems, and even when a very large horizontal force that exceeds the allowable deflection limit of the compression coil spring is applied, the horizontal vibration is more effectively prevented. An object is to provide a vibration absorber capable of absorbing.

According to the first aspect of the present invention, “the load-carrying compression coil spring 12, the lower case 14 provided on the lower part of the compression coil spring 12 and mounted on the lower frame 2, and the upper surface of the compression coil spring 12 are provided. In the vibration absorbers 10 and 10 ′ configured by the upper case 16 that supports the upper frame 3 and the locking cylinder portion 14e that is erected on the lower case 14 inside the compression coil spring 12,
Horizontal load absorbing members 20 and 20 ′ each having an engagement hole 20c formed on the upper surface thereof are attached to the upper portion of the locking cylinder portion 14e.
On the ceiling surface of the upper case 16, an engaging protrusion 16c is vertically provided.
In a state where the vibration absorbers 10, 10 ′ are bent by the vertical pressing force, at least the tips of the engagement protrusions 16c are loosely fitted in the engagement holes 20c of the horizontal load absorbing members 20, 20 ′. The vibration absorbers 10 and 10 ′.

  The invention described in claim 2 is limited to the horizontal load absorbing members 20 and 20 ′. “The horizontal load absorbing members 20 and 20 ′ are made of a rubber block or a plurality of hard plates 22 and a viscoelastic body. It is a laminated body formed by alternately laminating a plurality of soft plates 24 ".

  The invention described in claim 3 is a second embodiment of the vibration absorber 10 ′. “The support tube insertion hole 14h is formed in the locking cylinder portion 14e, and the lower surface of the horizontal load absorbing member 20 ′ is formed on the lower surface thereof. When the vibration absorber 10 ′ is interposed between the upper frame 3 and the lower frame 2 of the vibration isolation frame 1, a rod-shaped support bar 26 is suspended so as to pass through the support rod insertion hole 14h. The length of the support bar 26 is set so that the lower end of the support bar 26 comes into contact with the lower mount 2 ”.

  The invention described in claim 4 is characterized in that a surging preventing member 18 in contact with the inner peripheral surface of the compression coil spring 12 is attached to the locking cylinder portion 14e.

  The invention described in claim 5 is characterized in that a surging preventing member 18 ′ that contacts the outer peripheral surface of the compression coil spring 12 is provided.

  According to the vibration absorbers 10, 10 ′ according to claims 1 to 3, the vibration absorbers 10, 10 ′ are bent by the vertical pressing force caused by the loading of the equipment X, so that At least the tip of the hanging engagement protrusion 16c is fitted in the engagement hole 20c of the horizontal load absorbing member 20, 20 'in a loosely fitted state.

  In this state, when a very large horizontal force (rolling) such as an earthquake is applied to the vibration isolation frame 1 on the lower frame 2, the compression coil spring 12 is bent in the horizontal direction and at the same time the engaging protrusion 16 c. Is pressed against the inner surface of the engagement hole 20c, and the horizontal load absorbing members 20, 20 'are distorted in the horizontal direction. Due to this distortion, a horizontal force (rolling) exceeding the horizontal deflection of the compression coil spring 12, that is, horizontal kinetic energy is absorbed by the horizontal load absorbing members 20, 20 '. In other words, even if the horizontal sway of the upper gantry 3 due to the horizontal sway of the lower gantry 2 due to the earthquake is such that the compression coil spring 12 exceeds the limit of deflection in the horizontal direction, it is below the limit. As a result, the equipment device X can be effectively prevented from being overturned or damaged.

  In particular, according to the vibration absorber 10 ′ of the third aspect, even when an excessive force in the vertical direction is applied to the vibration absorber 10 ′ due to the vertical vibration of the earthquake, before the compression coil spring 12 is fully contracted. Since the support rod 26 can receive the force, the load bearing force in the vertical direction can be greatly improved. Even in such a case, the compression coil spring 12 is not greatly damaged.

  In addition, by providing the surging preventing members 18 and 18 'that come into contact with the inner or outer peripheral surface of the compression coil spring 12, the surging that occurs depending on the type of vibration received from the equipment X or the installation surface G can be eliminated and compressed. The spring performance of the coil spring 12 can be kept normal.

It is a perspective view which shows the vibration absorber of 1st Example of this invention. (A) is II sectional drawing in FIG. 1, (B) is II-II sectional drawing in FIG. It is the perspective view which looked at the horizontal load absorption member of the present invention from the upper part. It is the perspective view which looked at the horizontal load absorption member of the present invention from the lower part. (A) is a figure which shows the use condition of the vibration absorber of 1st Example of this invention, (B) is a fragmentary sectional view of the modification. It is sectional drawing which shows the vibration absorber of 2nd Example of this invention. It is the perspective view which looked at the horizontal load absorption member of 2nd Example of this invention from upper direction. It is the perspective view which looked at the horizontal load absorption member of 2nd Example of this invention from the downward direction. It is a figure which shows the state use state of the vibration isolator with which the conventional damping body was mounted | worn. It is a figure which shows the conventional vibration absorber.

  Hereinafter, the vibration absorber 10 which is 1st Example of this invention is explained in full detail according to drawing. The vibration absorber 10 is disposed between the lower frame 2 installed on the installation surface G and the upper frame 3 on which the equipment device X is placed in the vibration isolation frame 1 as shown in FIG. While receiving a load, the vibration transmitted from the equipment X is absorbed.

  As shown in FIGS. 1 to 2, the vibration absorber 10 of the present embodiment is roughly constituted by a compression coil spring 12, a lower case 14, an upper case 16, a surging preventing member 18 and a horizontal load absorbing member 20 provided as necessary. It is configured. In this embodiment, an example in which the surging preventing member 18 is provided is shown, but it can be omitted.

  The compression coil spring 12 is formed by spirally winding a wire made of a metal having spring properties such as spring stainless steel or spring steel, and a compression coil spring used for a general vibration absorber and Similarly, depending on conditions such as the load of the equipment X placed on the vibration isolator 1 and the vibration generated from the equipment X, the wire diameter (when the wire is wound into a coil) and the coil The diameter, coil pitch, free height or allowable load height, etc. are optimally set.

  The lower case 14 is a member that is attached to the lower end of the compression coil spring 12 and is attached to the upper portion of the lower gantry 2. A pair of left and right hanging pieces 14b fitted on the upper surface, a circular ring wall 14k provided at the center of the upper surface of the main body 14a and having an inner diameter equal to or larger than the outer periphery of the compression coil spring 12; A locking cylinder portion 14e is provided on the inner side of the ring groove 14c via a ring groove 14c in which the lower end portion of the compression coil spring 12 is housed inside the wall 14k. Is provided with a support rod insertion hole 14h penetrating vertically. And the circumferential direction groove | channel 14d by which the fitting hook part 16d of the upper case 16 mentioned later is fitted is recessedly provided in the outer peripheral surface of the ring wall 14k over the perimeter. On the lower surface of the main body 14a, a bottom cover mounting ring groove 14m is formed around the support rod insertion hole 14h.

  The support rod insertion hole 14h provided at the center of the locking cylinder portion 14e functions as a “hole” into which the support rod 26 of the horizontal load absorbing member 20 ′ of the second embodiment described later is inserted. Yes (this point will be described later).

  An inner flange 14f protrudes from the inner surface of the upper end of the support rod insertion hole 14h over the entire circumference, and a horizontal load absorbing member described later is fitted into the fitting hole 14g surrounded by the inner flange 14f. 20 mounting portions 20b are fitted.

  In this embodiment, the main body 14a, the hanging piece 14b, the locking cylinder portion 14e, the inner flange 14f and the ring wall 14k constituting the lower case 14 are integrally formed, and the material thereof is weather resistance and Resin such as polyvinyl chloride and polypropylene having impact resistance is used.

  The upper case 16 in the present embodiment covers the compression coil spring 12 and protects the compression coil spring 12 from dust or the like. The cap portion 16a is placed on the compression coil spring 12 and the periphery of the cap portion 16a. And a bellows-cylindrical outer casing portion 16b extending downward from the bottom. In this embodiment, a thermoplastic elastomer having elasticity and weather resistance is used as the material of the upper case 16. In addition, if it is not necessary to cover the compression coil spring 12, the surrounding part 16b is not necessarily required. In the present embodiment, an example in which the surrounding portion 16b is provided will be described.

  The cap portion 16a has a circular cap shape with an opening on the lower surface, and a frustoconical engagement protrusion 16c is suspended from the center portion of the thick ceiling lower surface so that the smaller diameter side faces downward. An outer peripheral portion 16b of the bellows-like cylindrical body is integrally suspended from the outer peripheral lower edge of the portion 16a, and a fitting hook portion 16d is provided to project over the entire inner peripheral surface at the lower end portion of the outer peripheral portion 16b. Has been. An upper reinforcing plate 16e made of a metal ring plate is disposed on the ceiling lower surface of the cap portion 16a. An engaging projection 16c is inserted and suspended in the central through hole of the upper reinforcing plate 16e.

  In the unloaded state, the upper reinforcing plate 16e is fitted into the storage space 16f in the lower surface opening of the cap portion 16a in the state where the upper end portion of the compression coil spring 12 is in a natural length, and is disposed in the storage space 16f. Abut. And when it will be in a load state, the said engagement protrusion 16c will be located in the position right above the engagement hole 20c so that it may fit in the engagement hole 20c of the horizontal load absorption member 20 mentioned later in a loosely-fitted state. Of course, the engagement protrusion 16c may be fitted into the engagement hole 20c in a loose state in an unloaded state.

  The surging preventing member 18 includes a cylindrical tube portion 18a, an engagement flange portion 18b extending in a radial direction from the lower end portion of the tube portion 18a, and a plurality of radially projecting protrusions on the outer peripheral surface of the tube portion 18a. It is comprised with the viscoelastic piece 18c. In FIG. 2B, the viscoelastic piece 18c is bent in an L shape because it contacts the inner periphery of the compression coil spring 12. FIG. 5B shows an example in which another surging preventing member 18 ′ is disposed in contact with the outer periphery of the compression coil spring 12.

  In the present embodiment, the entire surging prevention member 18 is formed of a viscoelastic member such as a low-rebound rubber having excellent shock vibration absorption and internal damping, hardly repels even when subjected to external force, and absorbs energy. Of course, the present invention is not limited to this, and only the tube portion 18a or the tube portion 18a and the engaging flange portion 18b are made of metal members such as iron and brass, and the tube portion 18a is formed of a viscoelastic member. You may make it project 18c. If the engagement flange portion 18b is formed of a viscoelastic member, it is possible to insulate the lower case 14 and the compression coil spring 12 from each other, which is more preferable.

  As shown in FIGS. 3 to 4, the first embodiment of the horizontal load absorbing member 20 includes a cylindrical horizontal load absorbing member main body 20a, and a mounting portion 20b provided at the lower end of the horizontal load absorbing member main body 20a. It is roughly composed of. A straight hole provided at the center of the horizontal load absorbing member main body 20a is an engagement hole 20c into which the engagement protrusion 16c of the upper case 16 is fitted.

  An example of the horizontal load absorbing member main body 20a is, for example, a plurality of (four in this embodiment) hard plates 22 formed in a disk shape, and a plurality of (in this embodiment) formed in a disk shape, for example, like the hard plate 22. In this case, four sheets of flexible plates 24 are alternately laminated to form a cylindrical laminated body. In this case, the uppermost part is the soft plate 24. (Note that the shape of the horizontal load absorbing member main body 20a is not limited to the laminated body of disk-shaped members as described above, and may be polygonal. The structure is not limited to the laminated body, and the rubber block alone may be used instead of the laminated body. Good.)

  As the material of the hard plate 22, a hard material, more specifically, a rolled steel material (SS400) such as steel or stainless steel is used.

  On the other hand, the soft plate 24 is formed of a synthetic resin (viscoelastic body) having viscoelasticity, and more specifically, EPDM (ethylene propylene diene rubber) is used.

  The thickness of the soft plate 24 is set to be thicker than that of the hard plate 22. In this embodiment, the thickness of the soft plate 24 is set to be about 1.5 times the thickness of the hard plate 22.

  A mounting portion 20b is attached to the lower surface of the horizontal load absorbing member body 20a. The outer diameter of the mounting portion 20b is set to be approximately equal to the fitting hole 14g formed on the inner surface of the upper end portion of the locking cylinder portion 14e, and the lower portion of the mounting portion 20b is fitted into the fitting hole 14g. Movement of the horizontal load absorbing member 20 attached to the upper end of the case 14 in the horizontal direction is restricted.

  When using the vibration absorber 10, as in the conventional vibration isolation frame 1 shown in FIG. 9, the vibration absorber 10 is attached to each of predetermined locations (at least four corners) on the upper surface of the lower frame 2. The upper frame 3 is placed on the top, and the equipment X is further placed thereon.

  Then, as shown in FIG. 5A, the compression coil spring 12 of the vibration absorber 10 is bent by the weight of the upper frame 3 and the equipment X, and the engagement protrusion 16c of the upper case 16 is engaged with the horizontal load absorbing member 20. It fits in the hole 20c in a loosely fitted state.

  At this time, since the engaging protrusion 16c is formed in a downward truncated cone shape, there is a slight gap between the outer surface of the engaging protrusion 16c and the inner surface of the engaging hole 20c. The size of the gap varies depending on the amount of bending of the compression coil spring 12 (the degree of engagement of the engagement protrusion 16c with the engagement hole 20c). (Note that, unlike the above, the engaging protrusion 16c is not shown, but it may be cylindrical. In this case, the size of the gap does not change depending on the amount of bending of the compression coil spring 12.)

  As described above, when the vibration isolator 1 incorporating the vibration absorber 10 of the present embodiment is used, the vibration generated in the equipment device X is normally transmitted to the vibration absorber 10 via the upper frame 3. Then, transmission of this vibration to the installation surface G is blocked by repeated small expansion and contraction of the compression coil spring 12. Further, depending on the type of vibration generated in the equipment X, surging occurs in the compression coil spring 12, but the surging of the compression coil spring 12 is absorbed by the internal damping of the viscoelastic piece 18c constituting the surging preventing member 18. .

  On the other hand, when a huge earthquake occurs and the lower gantry 2 undergoes a violent horizontal reciprocation relative to the upper gantry 3, as a result, the equipment mounted on the upper gantry 3 vibrates excessively in the horizontal direction, And rolling occurs. For example, when the case where the upper frame 3 moves in the right direction in FIG. 5A with respect to the lower frame 2 is taken as an example, the upper case 16 moves horizontally with respect to the lower case 14 (the right side in FIG. The lower case 14 of the vibration absorber 10 is attached to the lower base 2 and the upper case 16 is attached to the upper base 3, so that the compression coil spring 12 is greatly bent in the horizontal direction. At the same time, the engaging protrusion 16c of the upper case 16 is pressed against the inner surface of the engaging hole 20c of the horizontal load absorbing member 20, and the plurality of soft plates 24 of the horizontal load absorbing member 20 are bent slightly in the horizontal direction as a whole. The upper case 16 is bent by the amount of movement. As a result, the kinetic energy in the horizontal direction of the upper gantry 3 is transmitted to the horizontal load absorbing member 20 via the engaging protrusion 16 c of the upper case 16.

  That is, the mounting portion 20b provided at the lower end of the horizontal load absorbing member 20 is fitted in the fitting hole 14g, and movement in the left-right direction with respect to the lower case 14 is restricted. Accordingly, when a horizontal force is applied to the horizontal load absorbing member 20, the soft plate 24 tries to move the upper end side in the horizontal direction (rightward in FIG. 5A) with respect to the lower end side of the horizontal load absorbing member 20. Is deformed (bent), whereby the horizontal kinetic energy applied to the horizontal load absorbing member 20 is absorbed.

  Since the horizontal kinetic energy applied to the compression coil spring 12 is reduced by the horizontal kinetic energy absorbed by the horizontal load absorbing member 20, it is possible to more effectively suppress horizontal vibration. It becomes. Moreover, since the horizontal load absorbing member 20 is normally held in a loosely fitted state and is not in direct contact with the compression coil spring 12, the spring characteristics of the compression coil spring 12 are not impaired.

  FIG. 6 shows another embodiment of the vibration absorber 10 '. Since the vibration absorber 10 'is the same as the horizontal load absorbing member 20 of the above-described embodiment except that the support rod 26 is provided on the lower surface of the horizontal load absorbing member 20', only the differences will be described below. I decided to.

  The vibration absorber 10 'of the second embodiment is roughly constituted by the compression coil spring 12, the lower case 14, the upper case 16, the surging preventing member 18 and the horizontal load absorbing member 20'.

  As shown in FIGS. 7 to 8, the horizontal load absorbing member 20 ′ includes a cylindrical horizontal load absorbing member main body 20a, a mounting portion 20b provided on the lower surface of the horizontal load absorbing member main body 20a, and a mounting portion 20b. The support rod 26 attached to the lower surface is generally configured. (The horizontal load absorbing member main body 20a may be formed of a single rubber block as described above.)

  The support rod 26 is a rod-like or tubular member made of a hard member such as steel, and is inserted through a support rod insertion hole 14h provided at the center of the locking cylinder portion 14e.

  The length of the support bar 26 is appropriately set so that the lower end of the support bar 26 comes into contact with the upper surface of the lower mount 2 when the horizontal load absorbing member 20 ′ is attached to the surging preventing member 18.

  Also in the vibration absorber 10 'of this embodiment, the same operational effects as those of the vibration absorber 10 of the above-described embodiment can be obtained with respect to the horizontal shaking of the earthquake. Further, since the support bar 26 is provided on the lower surface side of the horizontal load absorbing member 20 ′, even when an excessive force in the vertical direction is applied to the vibration absorber 10 ′, the force is applied to the support bar 26. And the load bearing force in the vertical direction can be greatly improved.

  That is, when a large rolling force is applied to the upper case 16 (or a force that pushes the lower case 14 from below), the inclined outer peripheral surface of the downward frustoconical engaging protrusion 16c is engaged with the horizontal load absorbing member 20a ′. It press-fits into the hole 20c and tries to push the engaging hole 20c of the soft plate 24, and simultaneously compresses the laminated soft plate 24. Thereby, when it is compressed to the compression limit of the soft plate 24, it is not further deformed, and the compression coil spring 12 is not excessively compressed and protected from damage. At this time, the force in the vertical direction is absorbed by the soft plate 24 by the compression of the soft plate 24.

[Example]
Six types of compression coil springs having different spring constants were prepared and incorporated as compression coil springs of the vibration absorber 10 as Examples 1 to 6. Then, a load was applied to Examples 1 to 6, and a load necessary to bend 10 mm was monitored. Thereafter, the load was unloaded from the bent state by 10 mm until the bending amount became 0 mm, and the load at that time was monitored. The results are shown in graphs 1-6.
[Comparative Example A]
Each of the compression coil springs having the same spring constant as that used in Examples 1 to 6 was prepared, and this was incorporated in a vibration absorber not provided with the horizontal load absorbing member 20 as Comparative Examples A1 to A6. Then, as in Examples 1 to 6, a load was applied to Comparative Examples A1 to A6, and the load necessary to deflect the compression coil spring by 10 mm was monitored. Thereafter, the load was unloaded from the bent state by 10 mm until the bending amount became 0 mm, and the load at that time was monitored. The result is shown in graph 1.

[Comparative Example B]
Compression coil springs having the same spring constant as those used in Examples 1 to 6 were prepared, and these were designated as Comparative Examples B1 to B6. And the load required in order to bend 10 mm of compression coil springs was monitored similarly to Examples 1-6 and Comparative Examples A1-A6. Thereafter, the load was unloaded from the bent state by 10 mm until the bending amount became 0 mm, and the load at that time was monitored. The results are shown in graphs 1-6.

[Graph 1]

[Graph 2]

[Graph 3]

[Graph 4]

[Graph 5]

[Graph 6]

  As can be seen from the graphs 1 to 6, in any case, it was found that the load resistance of the vibration absorber 10 is greatly improved by providing the horizontal load absorbing member 20. Thereby, the usefulness of providing the horizontal load absorbing member 20 was proved experimentally.

1: anti-vibration frame, 2: lower frame, 3: upper frame, 4: vibration absorber, 5: stopper, 5a: upper limit nut, 6: compression coil spring, 7: lower case, 7a: hanging piece, 8: upper Case: 9: Surging preventing member, 9a: Viscoelastic piece, 10, 10 ': Vibration absorber, 12: Compression coil spring, 14: Lower case, 14a: Main body, 14b: Dripping piece, 14c: Ring groove, 14d: Circumference Direction groove, 14e: Locking cylinder part, 14f: Inner flange, 14g: Fitting hole, 14h: Support rod insertion hole, 14j: Lower reinforcing plate, 14k: Ring wall, 14m: Bottom cover mounting ring groove, 16: Upper part Case, 16a: Cap part, 16b: Enclosure part, 16c: Engagement protrusion, 16d: Fitting hook part, 16e: Upper reinforcement plate, 16f: Storage space, 18, 18 ': Surging prevention member, 18a: Tube Part, 18b: engagement collar part, 18c : Viscoelastic piece, 20, 20 ': Horizontal load absorbing member, 20a: Horizontal load absorbing member body, 20b: Mounting portion, 20c: Engagement hole, 22: Hard plate, 24: Soft plate, 26: Support rod, G : Installation surface, X: Equipment

Claims (5)

A compression coil spring for supporting a load; a lower case provided at a lower portion of the compression coil spring and mounted on the lower frame; an upper case provided on an upper surface of the compression coil spring and supporting the upper frame; and the compression In a vibration absorber constituted by a locking cylinder portion erected on the lower case inside the coil spring,
A horizontal load absorbing member that absorbs a load in the horizontal direction and has an engagement hole formed on the upper surface thereof is attached to the upper portion of the locking cylinder portion,
On the ceiling surface of the upper case, an engaging protrusion is suspended,
A vibration absorber, wherein at least a tip of the engaging protrusion is loosely fitted into an engagement hole of the horizontal load absorbing member in a state where the vibration absorber is bent by a vertical pressing force.   The horizontal load absorbing member is a laminated body formed by alternately laminating a rubber block or a plurality of hard plates and a plurality of soft plates made of a viscoelastic body. A vibration absorber according to 1.   A support rod insertion hole is formed in the locking cylinder portion, and a rod-shaped support rod is vertically provided on the lower surface of the horizontal load absorbing member so as to penetrate the support rod insertion hole. The length of the support bar is set so that the lower end of the support bar comes into contact with the lower frame when a vibration absorber is interposed between the upper frame and the lower frame of the vibration frame. Item 3. A vibration absorber according to item 1 or 2.   The vibration absorber according to any one of claims 1 to 3, wherein a surging preventing member that contacts an inner peripheral surface of the compression coil spring is attached to the locking cylinder portion. The vibration absorber according to any one of claims 1 to 3, further comprising a surging preventing member that contacts an outer peripheral surface of the compression coil spring.