JP2007046287A - Shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorber capable of sufficiently reducing a floor impulsive sound. <P>SOLUTION: When a floor material vibrates, vibration from the floor material is damped when a movable part 31 vertically moves in a cylinder 26 while being energized upward by repulsive force of a first permanent magnet 30 and a second permanent magnet 40. Here, since the first permanent magnet 30 and the second permanent magnet 40 are mutually put in a noncontact state by the repulsive force, a vibration impulsive sound from the floor material is cut off, and is hardly transmitted to a slab. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shock absorber disposed between a slab and a flooring.

  In the shock absorber, there is a device that is arranged on the slab and supports the floor material in order to improve the floor impact sound blocking performance (see, for example, Patent Document 1). In such a shock absorber, for example, the support leg is provided with an elastomer, and the vibration from the floor material is damped by the elastomer.

In this conventional shock absorber, the vibration of the elastomer is transmitted to the slab, so that the floor impact sound cannot be sufficiently reduced.
JP-A-10-37343

  In view of the above facts, an object of the present invention is to provide a shock absorber capable of sufficiently reducing floor impact sound.

  The shock absorber according to the present invention described in claim 1 is disposed on the slab and includes a base portion including a cylindrical portion whose axial direction is the vertical direction, and a first magnetic force generating portion disposed in the cylindrical portion. A second magnetic force generation unit disposed above the first magnetic force generation unit in the cylindrical portion and having the same magnetic pole disposed opposite to the first magnetic force generation unit. And a movable portion that is urged upward by a repulsive force between the first magnetic force generation portion and the second magnetic force generation portion and that can move up and down within the cylindrical portion and supports the upper flooring.

  According to the shock absorber of the present invention described in claim 1, the flooring is supported by the movable portion directly or via another member. When the floor material vibrates, the movable part moves up and down in the cylindrical part while being urged upward by the repulsive force of the first magnetic force generating part and the second magnetic force generating part, thereby attenuating the vibration from the floor material. . Here, since the first magnetic force generation part and the second magnetic force generation part are brought into a non-contact state by repulsive force, the vibration impact sound from the flooring material is blocked and hardly transmitted to the slab.

  A shock absorber according to a second aspect of the present invention is the shock absorber according to the first aspect, wherein a protruding portion protruding inwardly is provided at the upper portion of the cylindrical portion, and between the lower surface of the protruding portion and the movable portion. An elastic stopper for preventing the movable portion from hitting the lower surface of the protruding portion is interposed.

  According to the shock absorber of the present invention described in claim 2, even if the movable part moves upward after the buffering, the movable part is prevented from hitting the lower surface of the projecting part by the elastic stopper. Generation of contact sound between the two can be suppressed.

  According to a third aspect of the present invention, there is provided the shock absorber according to the first or second aspect, further comprising a guide portion that guides the movable portion in the vertical direction within the cylindrical portion. .

  According to the shock absorber of the present invention described in claim 3, the movable portion is guided in the vertical direction within the cylindrical portion by the guide portion and smoothly moves up and down, so that stable operation can be ensured.

  According to a fourth aspect of the present invention, there is provided a shock absorber according to any one of the first to third aspects, wherein the space below the movable portion in the cylindrical portion communicates with the external space of the device. A path is formed.

  According to the shock absorber of the present invention described in claim 4, the gas flows between the space below the movable part in the cylinder part and the external space of the apparatus by moving the movable part up and down in the cylinder part. Flows through. Thereby, the vibration from the flooring can be effectively attenuated, and the convergence of the vibration can be accelerated.

  According to a fifth aspect of the present invention, there is provided the shock absorber according to the fourth aspect, wherein a flow rate adjusting means capable of adjusting a gas flow rate in the flow passage is provided in the base portion.

  According to the shock absorber of the present invention described in claim 5, an optimum amount of gas flows through the flow passage by adjusting the flow rate adjusting means. Thereby, the vibration from the flooring can be attenuated more effectively.

  A shock absorber according to a sixth aspect of the present invention is the shock absorber according to any one of the first to fifth aspects, wherein the first magnetic force generator is first between the first magnetic force generator and the second magnetic force generator. The cushioning material is arranged.

  According to the shock absorber of the present invention described in claim 6, when the amplitude of the movable portion is large, the first magnetic force generator collides with the second magnetic force generator via the first shock absorber. As a result, it is possible to suppress the contact sound between the first magnetic force generation unit and the second magnetic force generation unit, and to protect the first magnetic force generation unit and the second magnetic force generation unit.

  According to a seventh aspect of the present invention, there is provided the shock absorber according to any one of the first to sixth aspects, wherein the first magnetic force generation unit and the second magnetic force generation unit are vertically arranged. It is characterized in that a magnetic body is arranged around the orthogonal direction.

  According to the shock absorber of the present invention described in claim 7, the magnetic substance can cut out the magnetic leakage from the first magnetic force generation part and the second magnetic force generation part to the outside, and the first magnetic force facing each other. The magnetic flux density between the generating part and the second magnetic force generating part increases, and the repulsion effect between the first magnetic force generating part and the second magnetic force generating part increases.

  According to an eighth aspect of the present invention, there is provided the shock absorber according to any one of the first to seventh aspects, wherein a second shock-absorbing material is disposed below the base portion, and the base portion is It arrange | positions on the said slab through the said 2nd shock absorbing material.

  According to the shock absorber of the present invention described in claim 8, even if the base portion vibrates slightly, the second shock absorber cushions the vibration and transmits it to the slab.

  As described above, the shock absorber according to the present invention has an excellent effect that the floor impact sound can be sufficiently reduced.

An embodiment of a shock absorber according to the present invention will be described with reference to the drawings. In addition, arrow UP in a figure shows the upward direction in a floor structure.
(Configuration of the embodiment)
A floor structure 10 to which a composite shock absorber 20 as a shock absorber shown in FIG. 1 is applied is a double floor (dry sound insulation double floor) structure used in an apartment house or the like, and is emitted from the upper floor and downstairs. This is a structure for reducing floor impact sound (walking sound, falling sound of objects, jumping of children, etc.) that propagates to the floor.

  In the floor structure 10, a plurality of composite shock absorbers 20 arranged at a predetermined interval are interposed between a concrete floor slab 12 and an upper floor material 14, which serve as a frame floor, on the composite shock absorber 20. A floor support 34 is disposed to support the upper flooring 14. A space is formed between the floor slab 12 and the upper flooring 14 by the interposition of the composite shock absorber 20 and the floor support 34 to obtain a sound insulation effect.

  In addition, the upper floor material 14 of this embodiment has a laminated structure in which the base panel 14A is provided and the finishing material 14B is provided on the base panel 14A. Here, the base panel 14A, the floor support 34, and the composite shock absorber 20 are the floor base materials.

  As shown in FIG. 2, the composite shock absorber 20 has a base portion 22, which is a base pedestal 24 disposed on the floor slab 12 and the base pedestal 24. And a cylinder 26 as a cylinder portion attached to the cylinder.

  As shown in FIGS. 2 and 3, the base pedestal 24 has a substantially disk shape, and a short cylindrical wall portion 25 is directed upward (in the direction of the arrow UP) at the radial intermediate portion of the base pedestal 24. Protrusions are formed. A first permanent magnet 30 as a short columnar first magnetic force generating portion is disposed inside the wall portion 25 in the radial direction, and the lower surface of the first permanent magnet 30 is bonded to the base pedestal 24 with an adhesive. Has been. A through hole 24 </ b> A is formed through the center of the base pedestal 24 for venting air when the first permanent magnet 30 is bonded. In addition, although it is preferable to form through-hole 24A in order to make the 1st permanent magnet 30 closely_contact | adhere to the base pedestal 24, it is not an essential requirement. The first permanent magnet 30 is disposed in the cylinder 26 by being bonded to the base pedestal 24.

  An annular spacer 28 as a magnetic body is disposed around the first permanent magnet 30 in the direction perpendicular to the vertical direction, that is, between the first permanent magnet 30 and the wall portion 25. The lower surface is bonded to the base pedestal 24 with an adhesive.

  As shown in FIG. 2, a first opening 25 </ b> A is formed in the upper surface portion of the wall portion 25, and a second opening as an air damper hole is formed in the upper surface portion radially outside the wall portion 25. A portion 24B is formed, and the first opening portion 25A and the second opening portion 24B are communicated to form a flow passage 23. The flow passage 23 is also communicated with a third opening 24C formed in the outer peripheral surface portion of the base pedestal 24, and a flow rate adjusting bolt 50 as an air damper adjusting screw is inserted from the third opening 24C. It is like that. The tip of the flow rate adjusting bolt 50 has a conical shape so that the width of a part of the flow passage 23 between the first opening 25A and the second opening 24B can be adjusted.

  In the base pedestal 24, a mounting hole 24 </ b> D for mounting the cylinder 26 is formed through the inner side in the radial direction than the second opening 24 </ b> B. The mounting holes 24 </ b> D shown in FIG. 3 are provided at a plurality of locations (a total of four locations in the present embodiment) along the outer side in the radial direction from the standing position of the wall portion 25. In FIG. 2, as shown in the lower right part of the notch with the cut surface changed, the cylinder 26 has a mounting hole 26 </ b> A facing the mounting hole 24 </ b> D, and the mounting hole 24 </ b> D and the mounting hole The cylinder 26 is attached to the base pedestal 24 by bolts 52 inserted into 26A. In the mounted state, the axial direction of the cylinder 26 is the vertical direction.

  A movable portion 31 is disposed above the first permanent magnet 30 inside the cylindrical portion 126 of the cylinder 26. The movable part 31 includes a yoke 32 and a second permanent magnet 40 as a second magnetic force generation part.

  The yoke 32 of the movable part 31 is substantially cylindrical and has a substantially H-shaped longitudinal section, and supports the upper floor material 14 (see FIG. 1) above via a floor support 34. The floor support 34 includes a rubber leg 35 placed in a central recess 32A formed in the upper part of the yoke 32, and a support bolt 36 supported on the rubber leg 35 in an upright state. A male screw portion 36B is formed on the shaft portion 36A of the support bolt 36, and this male screw portion 36B is connected to a female screw portion (not shown) formed on the base panel 14A of the upper floor material 14 shown in FIG. It is designed to be screwed together.

  The movable part 31 shown in FIG. 2 is movable up and down within the cylinder 26. The inner peripheral surface of the cylinder 26 is a guide surface 26B as a guide portion for guiding the yoke 32 of the movable portion 31 in the vertical direction in the cylinder 26, and is a low friction surface with a small friction coefficient.

  Here, the space 33 below the yoke 32 in the cylinder 26 and the external space of the apparatus are communicated with each other by a flow passage 23, and the flow passage 23 has a first opening 25A and a second opening 24B. The doorway. The flow rate adjusting bolt 50 can adjust the amount of gas flow in the flow passage 23.

  A concave portion 32B that is circular in a bottom view is formed in the lower portion of the yoke 32, and a second permanent magnet 40 serving as a second cylindrical magnetic force generating portion is disposed in the concave portion 32B. The upper surface of the magnet 40 is bonded to the yoke 32 with an adhesive. A through hole 32 </ b> C is formed through the central portion of the yoke 32 for venting air when the second permanent magnet 40 is bonded. In addition, although it is preferable to form the through-hole 32C in order to make the 2nd permanent magnet 40 closely_contact | adhere to the yoke 32, it is not an essential requirement.

  An annular spacer 42 as a magnetic body is disposed around the second permanent magnet 40 in the direction perpendicular to the vertical direction, that is, between the second permanent magnet 40 and the inner peripheral surface of the recess 32B. The upper surface of the spacer 42 is bonded to the yoke 32 with an adhesive.

  The second permanent magnet 40 is arranged in series above the first permanent magnet 30 in the cylinder 26, and has the same magnetic pole (N pole and N pole, or S pole and S) with respect to the first permanent magnet 30. Poles) are arranged facing each other. The movable part 31 provided with the second permanent magnet 40 is biased upward by the repulsive force of the first permanent magnet 30 and the second permanent magnet 40, and is normally in a non-contact state.

  The spacers 28 and 42 arranged around the first and second permanent magnets 30 and 40 cut the magnetic leakage to the outside of the first and second permanent magnets 30 and 40, and thereby the first and second opposing permanent magnets 30 and 40 are opposed to each other. The magnetic flux density of the 2nd permanent magnets 30 and 40 increases, and the repulsion effect of the 1st and 2nd permanent magnets 30 and 40 increases.

  The first and second permanent magnets 30 and 40 inserted and arranged in the cylinder 26 may be male screws, cobalt, ferrites, alnicos, rare earths, or rubber magnets.

  Between the 1st permanent magnet 30 and the 2nd permanent magnet 40, the rubber sheet 44 as a 1st shock absorbing material is arrange | positioned. The rubber sheet 44 covers the first permanent magnet 30, the spacer 28, and the upper surface 24 </ b> E (excluding the first opening 25 </ b> A) of the base pedestal 24 facing the space 23. As a material of the rubber sheet 44, for example, rubber materials such as natural rubber, synthetic rubber, and foamed rubber can be applied.

  An upper cover 27 is provided on the upper portion of the cylinder 26 as a protruding portion protruding radially inward, and the upper cover 27 encloses the movable portion 31 in the cylinder 26. In the present embodiment, the upper cover 27 integrally fixes a member cut out in an annular shape to the upper part of the cylindrical portion 126 of the cylinder 26 by welding. By forming and fixing the cylindrical portion 126 and the upper cover 27 as separate bodies, the cylinder 26 can be easily manufactured. In the present embodiment, the upper cover 27 is fixed to the cylindrical portion 126, but the upper cover 27 may be formed by integral processing.

  As shown in FIG. 3, a shallow annular recess 32 </ b> D is formed on the outer periphery of the central recess 32 </ b> A on the upper portion of the yoke 32 below the upper cover 27. A thin annular rubber ring 46 is fitted in the annular recess 32D.

As shown in FIG. 2, a rubber stopper 48 as an annular elastic stopper made of a rubber material is interposed between the lower surface of the upper cover 27 and the yoke 32 of the movable portion 31. The yoke 32 is prevented from directly contacting the lower surface of the upper cover 27. As a material of the rubber stopper 48, for example, rubber materials such as natural rubber, synthetic rubber, and foamed rubber can be applied.
(Operation of the embodiment)
Next, the operation of the above embodiment will be described.

  The upper floor material 14 shown in FIG. 1 is supported by a movable part 31 shown in FIG. The movable portion 31 is biased upward by a repulsive force (repulsive force) between the first permanent magnet 30 and the second permanent magnet 40.

  When the movable part 31 receives a vibration impact from the upper floor material 14 via the floor support 34, the movable part 31 is guided in the vertical direction by the guide surface 26B in the cylinder 26 and smoothly moves up and down. Here, since the repulsive force of the 1st, 2nd permanent magnets 30 and 40 is acting also when the movable part 31 moves up and down, the vibration impact force is gradually relieved by this repulsive force.

  Further, when the movable portion 31 moves up and down in the cylinder 26, the gas flows between the space 33 below the movable portion 31 in the cylinder 26 and the external space of the apparatus through the flow passage 23. As a result, a mechanism as an air damper acts to effectively dampen the vibration from the upper flooring 14, and the convergence of the vibration can be accelerated.

  At this time, since the opposing first and second permanent magnets 30 and 40 are not in contact with each other, the vibration impact sound from the upper floor material 14 is blocked and is not easily transmitted to the floor slab 12. Thereby, even if the upper floor material 14 is set so that the bending is very small (for example, 2 mm or less), the vibration impact sound can be effectively blocked. Further, since a floor impact sound in a low frequency region (for example, a region of 100 Hz or less) can be reduced with respect to a heavy impact with a large impact force (detailed in Test Example 4 described later), the total floor impact sound can be reduced. The reduction effect becomes extremely large.

Here, even when the impact force is very large and the amplitude of the movable portion 31 is large, the first permanent magnet 30 and the second permanent magnet 40 collide with each other via the rubber sheet 44. The contact sound between the first permanent magnet 30 and the second permanent magnet 40 can be suppressed. (Since each opposing part of the spacer 28 and the spacer 42 and each opposing part of the upper surface 24E of the base pedestal 24 facing the space 23 and the yoke 32 also collide via the rubber sheet 44, these In addition, the rubber sheet 44 can protect the first and second permanent magnets 30 and 40 at the time of collision, so that the first and second permanent magnets 30 and 40 can be protected. Durability is improved. (The durability of the spacers 28 and 42, the upper surface 24E of the base pedestal 24 facing the space 23, and the yoke 32 is also improved.)
Further, even if the buffered movable portion 31 jumps upward, the yoke 32 of the movable portion 31 is prevented from directly hitting the lower surface of the upper cover 27 by the rubber stopper 48, so that the lower surfaces of the yoke 32 and the upper cover 27 are prevented. Generation of contact sound between the two can be suppressed. Further, the upward repulsive force of the movable portion 31 can be suppressed by the elastic force of the rubber stopper 48 and the rubber ring 46.

The damping characteristic can be changed by adjusting the flow rate adjusting bolt 50, and an optimal amount of gas flows through the flow passage 23 when the movable portion 31 moves up and down in the cylinder 26. Thus, the vibration from the upper flooring 14 can be damped more effectively.
(Test Example 1)
A comparative test of the difference in the damping effect with respect to the impact was performed by changing the diameter of the air hole (corresponding to the second opening 24B in the above embodiment) as the air damper hole.

  The composite shock absorber used in the comparative test is almost the same as the above embodiment, and the distance between the first permanent magnet and the second permanent magnet is 5 mm, and the diameters of the first and second permanent magnets are 50 mm. The upper flooring is supported through the floor support without placing the rubber legs. In addition, the diameters of the air holes communicating with the flow passage were set to three patterns of 3.0 mm, 1.5 mm, and 0 mm (no air holes).

  FIG. 4 shows a schematic configuration of a test apparatus 60 used in Test Example 1. As shown in FIG. 4, a test object 64 is disposed on the impact force measurement sensor 62, and the test object 64 supports an upper virtual floor 66 for impact test. A support rod 67 is disposed above the impact test virtual floor 66, and a ball 68 serving as an impact source is suspended from the tip of the support rod 67. The sphere 68 is disposed at a height of 1000 mm from the impact test virtual floor 66.

  Here, the ball 68 was dropped on the impact test virtual floor 66 to give an impact to the impact test virtual floor 66, and the impact force was measured by the impact force measuring sensor 62.

The test results are shown in the graph of FIG. The vertical axis of the graph is the impact force measured by the impact force measurement sensor 62 (see FIG. 4), and the horizontal axis of the graph is the elapsed time. As shown in FIG. 5, in the case of the above test conditions, it was found that the best damping effect can be obtained when the aperture of the air hole is 1.5 mm.
(Test Example 2)
In order to confirm the relationship between the presence / absence of the yoke (corresponding to the yoke 32 in the above embodiment) and the damping effect on the impact, a comparative test was performed.

  The composite shock absorber used in the comparative test is substantially the same as in the above embodiment, the diameter of the first and second permanent magnets is 50 mm, and no rubber sheet is disposed between the first and second permanent magnets. An air hole as an air damper hole (corresponding to the second opening 24B in the above embodiment) is not formed, and one of the comparison targets is provided with a yoke (with a yoke), and the other is provided with no yoke. Also in Test Example 2, the test apparatus 60 shown in FIG. 4 was used.

The test results are shown in the graph of FIG. The vertical axis of the graph is the impact force measured by the impact force measurement sensor 62 (see FIG. 4), and the horizontal axis of the graph is the elapsed time. As shown in FIG. 6, in the case of the above test conditions, it was found that a better damping effect can be obtained when the yoke is provided (with the yoke) than when the yoke is not provided.
(Test Example 3)
When the composite shock absorber supports the upper floor material via a floor support with rubber legs, and when the composite shock absorber supports the upper floor material via a floor support without rubber feet, A comparative test was conducted to confirm the relationship.

  The composite shock absorber used in the comparative test is substantially the same as the above embodiment, the distance between the first permanent magnet and the second permanent magnet is 10 mm, and the diameter of the first and second permanent magnets is 50 mm. The air hole as the air damper hole (corresponding to the second opening 24B in the above embodiment) was configured with a diameter of 1.5 mm.

  One of the comparison targets is similar to the present embodiment, and the floor support with rubber legs is arranged in series in this composite shock absorber to support the upper floor material, and the other comparison target is the composite shock absorber without rubber legs. The floor support was arranged in series to support the upper flooring.

  Also in Test Example 3, the test apparatus 60 shown in FIG. 4 was used.

The test results are shown in the graph of FIG. The vertical axis of the graph is the impact force measured by the impact force measurement sensor 62 (see FIG. 4), and the horizontal axis of the graph is the elapsed time. (The case where the floor support without rubber legs is arranged in series on the composite shock absorber and the upper floor material is supported is described as the case of only the composite shock absorber in the graph.) As shown in FIG. Even in the case, a good damping effect could be obtained.
(Test Example 4)
In order to confirm the operation of the above embodiment, when the upper flooring is supported only by the floor support with rubber legs, and when the composite shock absorber supports the upper flooring via the floor support with rubber legs. A comparative test was conducted to compare the reduction of floor impact sound.

  The floor support with rubber legs and the composite shock absorber used in the comparative test are almost the same as in the above embodiment.

  One of the comparison targets supports the upper floor material only by the floor support with rubber legs, and the other comparison target has a floor support with rubber legs arranged in series in this composite shock absorber, as in this embodiment. The upper flooring was supported.

  FIG. 8 shows a schematic configuration of a test apparatus 70 used in Test Example 4. As shown in FIG. 8, the test apparatus 70 includes a table-like pedestal 71, and the upper plate of the pedestal 71 is a concrete virtual floor slab 72. A test object 74 is disposed above the virtual floor slab 72, and the test object 74 supports the upper virtual upper floor 76. A sound source device 78 as a sound source is disposed on the upper surface 76A of the virtual upper floor 76.

  A plurality of microphones 80 attached to a tripod are arranged below the virtual floor slab 72. The microphone 80 is connected to a sound level meter 82 via wiring, and the sound level meter 82 is further connected to a computer 84.

  Here, test sound was generated by the sound source device 78, collected by the microphone 80 below the virtual floor slab 72, the impact sound level was measured by the sound level meter 82, and output to the computer 84.

  The test results are shown in the graph of FIG. The vertical axis of the graph is the floor impact sound level measured by the sound level meter 82 (see FIG. 8), and the horizontal axis of the graph is the frequency of the test sound by the sound source device 78 (see FIG. 8).

  As shown in FIG. 9, in a frequency region of less than about 500 Hz, the floor support with rubber legs is only supported when the floor support with rubber legs is arranged in series with the composite shock absorber to support the upper flooring. As a result, it was found that there is an effect of reducing floor impact sound as compared with the case where the upper floor material is supported by this, particularly in the frequency region of 250 Hz or less.

  In the above embodiment, the movable part 31 shown in FIG. 2 includes the yoke 32, the second permanent magnet 40, and the like. However, the movable part is, for example, a movable part composed only of the second permanent magnet. Other movable parts may be used.

  Moreover, in the said embodiment, although the lower surface of the 1st permanent magnet 30 is adhere | attached on the base part 22, for example, the side of a 1st permanent magnet is directly or via a different member (for example, spacer), a base It is good also as a structure attached to a part.

  Further, a second cushioning material such as a cushioning rubber leg member, a cushioning rubber sheet (shown by a two-dot chain line 90 in FIG. 2), etc. is disposed below the foundation pedestal 24 of the base portion 22 in the above embodiment, and the foundation It is good also as a structure by which the base 24 is arrange | positioned on the floor slab 12 through this 2nd shock absorbing material.

  Furthermore, in the said embodiment, although the guide part which guides the movable part 31 to the up-down direction within the cylinder 26 is made into the guide surface 26B, a guide part is not limited to this, For example, a movable part and a cylindrical part A key may be provided on one of the two and a key groove may be provided on the other so that the movable part is guided in the vertical direction within the cylindrical part.

  Furthermore, in the said embodiment, the rubber sheet 44 is set as the structure which coat | covers the 1st permanent magnet 30, the spacer 28, and the upper surface 24E (except for the 1st opening part 25A) of the base pedestal 24 which faced the space 33. However, the structure which only coat | covers the 1st permanent magnet 30 and the spacer 28 may be sufficient. Thereby, it can avoid that the upper surface of the wall part 25 of the base pedestal 24 and the yoke 32 touch.

  In the above-described embodiment, the rubber sheet 44 as the first cushioning material is disposed. However, the first cushioning material is not limited to this, and may be, for example, another cushioning material such as a sealing material. There may be.

  Moreover, in the said embodiment, although the 1st permanent magnet 30 and the 2nd permanent magnet 40 are applied as a 1st magnetic force generation part and a 2nd magnetic force generation part, a 1st magnetic force generation part and a 2nd magnetic force are applied. The generating unit may be another magnetic force generating unit such as an electromagnet.

1 is a cross-sectional view showing a floor structure to which a composite shock absorber according to an embodiment of the present invention is applied. It is sectional drawing which shows the longitudinal cross-section of the composite buffering device which concerns on embodiment of this invention. 1 is an exploded perspective view showing a composite shock absorber according to an embodiment of the present invention. It is a schematic block diagram which shows the test apparatus used in Test Example 1-Test Example 3. 6 is a graph showing test results of Test Example 1. 10 is a graph showing test results of Test Example 2. 10 is a graph showing test results of Test Example 3. 10 is a schematic configuration diagram showing a test apparatus used in Test Example 4. FIG. 10 is a graph showing test results of Test Example 3.

Explanation of symbols

12 Floor slab (slab)
14 Upper flooring (flooring)
20 Compound shock absorber (buffer device)
22 Base 23 Passage 26 Cylinder (Cylinder)
26B Guide surface (guide section)
27 Upper cover (protruding part)
28 Spacer (Magnetic)
30 1st permanent magnet (1st magnetic force generation part)
31 Movable part 40 Second permanent magnet (second magnetic force generating part)
42 Spacer (Magnetic)
44 Rubber sheet (first cushioning material)
48 Rubber stopper (elastic stopper)
50 Flow rate adjusting bolt (flow rate adjusting means)
90 Rubber sheet for cushioning (second cushioning material)

Claims (8)

A base portion provided on the slab and provided with a cylindrical portion whose axial direction is the vertical direction;
A first magnetic force generator disposed in the cylindrical portion;
A second magnetic force generation unit disposed above the first magnetic force generation unit and having the same magnetic pole opposed to the first magnetic force generation unit in the cylindrical portion; and A movable part that is urged upward by a repulsive force with the second magnetic force generation part and is movable up and down within the cylindrical part, and supports the upper flooring;
A shock absorber characterized by comprising:   A protruding portion that protrudes inward is provided at the upper portion of the cylindrical portion, and an elastic stopper that prevents the movable portion from hitting the lower surface of the protruding portion is interposed between the lower surface of the protruding portion and the movable portion. The shock absorber according to claim 1.   The shock absorber according to claim 1 or 2, further comprising a guide portion that guides the movable portion in a vertical direction within the tube portion.   The shock absorber according to any one of claims 1 to 3, wherein a flow passage that communicates a space below the movable portion in the cylindrical portion and an external space of the device is formed.   5. The shock absorber according to claim 4, wherein a flow rate adjusting means capable of adjusting a gas flow rate in the flow passage is provided in the base portion.   6. The shock absorber according to claim 1, wherein a first shock absorbing material is disposed between the first magnetic force generator and the second magnetic force generator. 7.   The magnetic material is arrange | positioned around the direction orthogonal to an up-down direction in the said 1st magnetic force generation part and a said 2nd magnetic force generation part, The Claim 1 characterized by the above-mentioned. Shock absorber.   The second cushioning material is disposed below the base portion, and the base portion is disposed on the slab via the second cushioning material. The shock absorber according to one item.

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