JP4192923B2 - Isolation device - Google Patents

Description

  The present invention relates to a vibration isolator, and more particularly to a vertical vibration isolator capable of effectively lengthening a structure using an air spring.

  The vibration isolator is between the base to which vibrations such as the ground and floor are input and the building or precision equipment installed on this base, other equipment and devices that dislike vibration, and objects such as articles. The so-called long-perioding means is provided, and the long-perioding means makes the period longer than the vibration period input based on the natural period on the side of the vibration-isolated object, and is input from the base to the object to be isolated. Vibration is reduced.

  Various elastic bodies represented by laminated rubber, coil springs, air springs and the like are employed as the long period means. In particular, since the air spring is a spring that uses the compression elasticity of air, the air spring is softer than other springs and exhibits excellent characteristics for extending the period of the vibration isolation object. For this reason, it is preferable to use an air spring as a vibration isolator, and when using this as a vertical vibration isolator, a bellows type air spring is generally used.

  A typical structure of this bellows type air spring is as follows: a cylindrical rubber bellows in which peaks and valleys are formed in the circumferential direction to form a bellows, a metal face plate covering the top and bottom, and a valley portion of the rubber bellows. The air that is configured to include the intermediate ring to be fitted and is sealed in the rubber bellows is used as a spring by the elastic force when compressed with the expansion and contraction of the rubber bellows.

  By the way, if the bellows type air spring is used with a rubber bellows height, that is, with a reduced number of bellows steps, in order to enhance the support of a heavy load isolation object, the volume of the air chamber becomes small. The air pressure increases excessively relative to the vertical vibration relative to the object to be isolated, and the rubber bellows bulges beyond an allowable amount, causing a problem in durability. Thus, if the volume of the air chamber is increased in order to suppress an excessive increase in air pressure, the number of stages of the rubber bellows is increased to increase the air spring. However, when the air spring is raised in this way, the rubber bellows is likely to buckle, making it difficult to cope with a large load and a large amplitude intended for a large earthquake.

  Accordingly, as a method of avoiding buckling of the rubber bellows, the present inventor proposes to use a rolling seal type air spring instead of the bellows type air spring. A solid inner member and a hollow cylindrical outer member arranged concentrically at appropriate intervals, and folded and arranged so as to hang down in a horizontal gap between the outer periphery of the inner member and the inner periphery of the outer member. And a flexible cylindrical rolling seal member. The rolling seal member has its middle part folded back, its inner peripheral part along the outer periphery of the inner member and its end attached airtight to the upper end of the inner member, and its outer peripheral part along the inner periphery of the outer member. The end is hermetically attached to the upper end of the outer member, and the air chamber formed between the inner member and the outer member is sealed.

  When the inner member and the outer member are displaced relative to each other in the vertical direction due to vibration input, the folded portion of the rolling seal member is raised or lowered by a horizontal gap. At this time, the pressure acting on the air chamber acts on the rolling seal member, but the folded portion of the rolling seal member is a portion that closes the horizontal gap between the inner member and the outer member. The air chamber pressure is received.

  When such a rolling seal type air spring is used as a means for lengthening the vibration isolator, the volume of the air chamber formed between the inner member and the outer member in order to cope with a large vibration amplitude of an excessive earthquake. It is desirable to increase. In this case, in order to increase the volume of the air chamber without increasing the air spring, the horizontal gap between the solid inner member and the hollow cylindrical outer member is increased. However, when the horizontal gap between the inner member and the outer member becomes large in this way, the following various problems are caused.

  That is, if a large diameter difference is set between the outer periphery of the inner member and the inner periphery of the outer member in order to increase the horizontal clearance, the peripheral length between the inner peripheral portion and the outer peripheral portion of the rolling seal member along each of them is increased. It will be very different. Thus, when the inner peripheral portion along the outer periphery of the inner member is attracted to the inner periphery of the outer member by the input of vertical vibration, the outer peripheral portion along the inner periphery of the outer member is attracted to the outer periphery of the inner member. The rolling seal member does not behave smoothly when it is pressed. In particular, when the outer peripheral portion of the rolling seal member is drawn from the state along the outer member having a large diameter to the inner member having a smaller diameter, the portion of the outer peripheral portion remaining in the circumferential direction is wrinkled due to the difference in peripheral length. Therefore, a fragile portion is generated in the rolling seal member while the generation of the wrinkles is repeated, which causes damage.

  When a large diameter difference is set between the inner member and the outer member, the area of the folded portion of the rolling seal member that closes the horizontal gap between the inner member and the outer member increases. For this reason, the pressure in the air chamber acts on the folded portion having a large area, and the pressure to be received at the folded portion becomes large. As a result, the attachment portion between the inner member and the outer member and both ends of the rolling seal member This increases the load acting on the rolling seal member, which also causes damage to the rolling seal member.

  Therefore, the present invention has been made in view of such conventional problems, and the vibration isolator capable of ensuring smooth operation while expanding the air chamber of the rolling seal type air spring used as the long-period means. The purpose is to provide.

An inner member that is provided between a base to which vertical vibration is input and an object to be isolated above the base and protrudes from one of the base or the object to be isolated;
A hollow cylindrical outer member that protrudes from the other of the base or the vibration-isolating object toward one side and that surrounds the outer periphery of the inner member at an appropriate interval in the vertical and horizontal directions;
And one end as hanging horizontal gap between the outer periphery of the inner periphery and the inner member of the outer member is arranged to be folded so as to lie inside the other end, the inner member outer peripheral the one end Along with the inner member , the other end portion is airtightly attached to the outer member along the inner periphery of the outer member , and accompanying the vertical relative displacement between the base and the isolation object. The inner member and the outer member are displaced up and down in the horizontal gap according to the relative vertical displacement, and a gas-filled space can be formed from the horizontal gap between the outer member and the inner member. A flexible cylindrical rolling seal member,
In order to make the circumferential length of the one end portion and the other end portion of the rolling seal member equal, an uneven portion is formed in a portion of the outer periphery of the inner member where the one end portion is attached, and the one end portion is It is characterized by being closely attached along the uneven portion .

  According to this configuration, an uneven portion is formed on the outer periphery of the inner member, and the inner peripheral portion of the rolling seal member is attracted to the inner member while the rolling seal member is lifted and lowered within the horizontal gap in response to vertical vibration. At this time, since the pressure in the gas sealing space acts in a direction in which the inner peripheral portion of the rolling seal member is pressed against the outer periphery of the inner member, the inner peripheral portion is in close contact with the uneven portion. At this time, the outer peripheral length of the inner member is extended by providing the uneven portion, and the peripheral length of the inner peripheral portion of the rolling seal member that is in close contact with the extended inner member outer periphery can be extended. The peripheral lengths of the inner peripheral portion and the outer peripheral portion can be made equal. Therefore, even when the diameter difference between the inner member and the outer member is increased to enlarge the horizontal gap, the circumferential length of the inner peripheral portion of the rolling seal member along the inner member and the peripheral length of the outer peripheral portion along the outer member Therefore, when the inner peripheral portion along the outer periphery of the inner member is attracted to the inner periphery of the outer member by the input of vertical vibration, the outer periphery along the inner periphery of the outer member is reversed. The rolling seal member is prevented from being twisted when the portion is drawn to the outer periphery of the inner member, and the behavior can be caused smoothly. Further, when the outer peripheral portion of the rolling seal member is drawn to the inner member from the state along the outer member, wrinkles can be prevented from approaching the rolling seal member.

Further, in the above-described configuration, a guide member is provided between the inner member or the outer member that protrudes from the vibration isolation object and the base to restrict horizontal relative displacement and guide vertical relative displacement. It is characterized by that.
According to this configuration, since the vertical relative displacement can be guided while the horizontal relative displacement between the inner member or the outer member protruding from the vibration isolation object by the guide member and the base is restricted, the inner member and the outer member can be guided. The lateral displacement is prevented and the rocking vibration of the object to be isolated is prevented.

  In the vibration isolator of the present invention, an air spring is used to achieve a long period of the vibration isolation object, and the air spring is disposed between the inner member and the outer member surrounding the outer periphery thereof. Since it is configured with a rolling seal member and an uneven portion is formed on the outer periphery of the inner member to make the outer peripheral length equal to the inner peripheral length of the outer member, the diameter difference between the inner member and the outer member is increased. Even when the gas sealing space is expanded, it is possible to make the circumference of the inner circumference of the rolling seal member equal to the circumference of the outer circumference along the outer member. While being able to perform, it can prevent that a wrinkle approaches when a rolling seal member is drawn near to an inner member, and can improve the endurance.

  In addition, since a guide member that regulates horizontal relative displacement and guides the vertical relative displacement is provided between the inner member or outer member that protrudes from the vibration isolation object and the base, lateral displacement and locking of the vibration isolation object are provided. Vibration can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 6 show an embodiment of the vibration isolator of the present invention, FIG. 1 is a longitudinal sectional view of a rolling seal type air spring, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 4 is an enlarged sectional view taken along line BB in FIG. 1, FIG. 4 is an enlarged sectional view taken along line CC in FIG. 3, FIG. 5 is a sectional view taken along line DD in FIG. FIG.

  The vibration isolator 10 of the present invention performs vertical vibration isolation exclusively by an air spring 11 provided therein. In particular, in the present invention, the air spring 11 configured as a rolling seal type air spring is used. The air spring 11 may be configured as a three-dimensional vibration isolator by using a laminated rubber (not shown) that performs horizontal vibration isolation.

  That is, the vibration isolator 10 of the present embodiment is basically provided between the base 12 to which vertical vibration is input and the vibration isolation object above the base 12, and one of the base 12 or the vibration isolation object. An inner member 13 projecting from the other side to the other side, and a hollow projecting from the other side of the base 12 or the object to be vibration-isolated to one side and surrounding the outer periphery of the inner member 13 at an appropriate interval in the vertical and horizontal directions. The tubular outer member 14 is disposed so as to hang down in a horizontal gap S between the inner periphery of the outer member 14 and the outer periphery of the inner member 13, and the inner peripheral portion 15 b extends along the outer periphery of the inner member 13. In addition, the inner end is attached to the inner member 13 in an airtight manner, and the outer peripheral portion 15a is attached to the outer periphery of the outer member 14 so that the outer end is attached to the outer member 14 in an airtight manner. 2 is moved up and down in the horizontal gap S according to the vertical relative displacement between the inner member 13 and the outer member 14 accompanying the vertical relative displacement between the object 2 and the vibration isolation object, and the outer member from the horizontal gap S. 14 and a flexible cylindrical rolling seal member 15 that forms an air chamber 16 as a gas sealing space between the inner member 13 and the inner member 13.

  In such a vibration isolator 10, the inner member 13 is formed with a hollow portion 13 b as a hollow chamber communicating with the air chamber 16.

  Further, in order to make the circumferential lengths of the inner peripheral portion 15 b and the outer peripheral portion 15 a of the rolling seal member 15 equal, an uneven portion 20 that makes the outer peripheral length equal to the inner peripheral length of the outer member 14 is formed on the outer periphery of the inner member 13. Is done.

  Further, both ends of the rolling seal member 15 are attached to the outer member 14 and the inner member 13, and a cable 30 is disposed as a string-like reinforcing member along the contour of the rolling seal member 15.

  That is, as shown in FIGS. 1 and 2, the vibration isolator 10 according to the present embodiment is provided between a building foundation outside the figure and a building outside the figure constructed with a predetermined interval above the building foundation. An intervening rolling seal type air spring (hereinafter simply referred to as an air spring) 11 is provided. The air spring 11 includes a base 12 to which vibration due to an earthquake or the like is input from a building foundation, and a building as a vibration isolation object. An inner member 13 projecting upward from the base 12, an outer member 14 covering the upper end of the inner member 13 with an appropriate interval, and between the inner member 13 and the outer member 14. And a rolling seal member 15 that seals the two while allowing relative movement therebetween.

  The inner member 13 is formed in a hollow cylindrical shape by opening an upper end portion facing the outer member 14 with an opening 13a and forming a hollow portion 13b communicating with the opening 13a. The lower end portion of the inner member 13 is integrally fixed to the base 12 and is closed. On the other hand, the outer member 14 is formed in an inverted U-shaped cross section by an end plate 14a opposed to the upper end of the inner member 13 at an appropriate interval, and a peripheral wall 14b hanging annularly from the outer periphery of the end plate 14a. 14b is configured to concentrically surround the outer periphery of the upper end portion of the inner member 13, and the end plate 14a is fixed to the lower surface of the building not shown.

  The rolling seal member 15 is formed in a natural state by using fiber reinforced rubber as a raw material, and is folded into an intermediate portion so that one side is turned over. Attached across. That is, the rolling seal member 15 is folded back at the intermediate portion, so that one end portion on the side to be turned over becomes the outer peripheral portion 15a and the other end portion on the opposite side becomes the inner peripheral portion 15b. Then, the inner peripheral portion 15 b is set along the outer periphery of the upper end portion of the inner member 13, and the outer peripheral portion 15 a is set along the inner periphery of the peripheral wall 14 b of the outer member 14. At this time, the end portions of the inner peripheral portion 15b and the outer peripheral portion 15a are fixed to the inner member 13 and the outer member 14 in an airtight manner, respectively.

  In this state, the rolling seal member 15 seals between the inner member 13 and the outer member 14 with the folded portion 15c hanging between the outer periphery of the inner member 13 and the inner periphery of the outer member 14. A space surrounded by the rolling seal member 15 is configured as an air chamber 16. Therefore, when the base 12 and the building are displaced up and down relatively by the vibration such as an earthquake being input to the air spring 11 configured in this way, the inner member 13 and the outer member 14 are moved in the vertical direction accordingly. The air pressure is changed while the volume of the air chamber 16 formed between the two is changed. And the natural period of a building is lengthened with the spring by the compression elasticity of air at this time, and it becomes possible to achieve effective vertical vibration isolation. Further, when the volume of the air chamber 16 is changed in this way, the rolling seal member 15 is moved up or down by the horizontal gap S between the inner peripheral portion 15b and the outer peripheral portion 15a.

  Further, in this embodiment, as shown in FIG. 3, an uneven portion 20 having a smooth waveform in the circumferential direction is formed on the outer peripheral surface of the inner member 13, and the inner portion of the rolling seal member 15 is formed along the uneven portion 20. The peripheral portion is moved up and down. The concavo-convex portion 20 includes a plurality of convex portions 21 formed along the generatrix direction of the inner member 13 and at equal intervals in the circumferential direction, and concave portions 22 formed between the convex portions 21, respectively. The corners on both sides of the distal end portion of 21 and the corners extending from the convex portion 21 to the concave portion 22 are formed as smooth circular arc surfaces so as not to cause local excessive stress on the rolling seal member 15.

  When the uneven portion 20 is formed, the inner peripheral portion 15b of the rolling seal member 15 is uneven as shown in FIG. 3 when it is pressed against the outer periphery of the inner member 13 by the pressure in the air chamber 16. It adheres along the part 20. At this time, the length of the outer periphery of the inner member 13 is extended by providing the uneven portion 20, and around the inner peripheral portion 15 b of the rolling seal member 15 that is in close contact with the outer periphery of the extended inner member 13. Can also be long. Accordingly, by adjusting the height difference between the convex portion 21 and the concave portion 22 of the concave-convex portion 20, the peripheral length of the inner peripheral portion 15b is set closer to or equal to the peripheral length of the outer peripheral portion 15a. can do.

  Further, in the present embodiment, as shown in FIGS. 3 and 4, the cable 30 is arranged along the outer surface of the rolling seal member 15 that is folded back. The number corresponding to 21 is provided. Each cable 30 is housed in grooves 31 and 32 as guides along the generatrix direction formed on the outer periphery of the inner member 13 and the inner periphery of the outer member 14. At this time, the groove portion 31 formed in the inner member 13 is formed on the protruding end surface of the convex portion 21, and the groove portion 32 formed in the outer member 14 is at a position facing the groove portion 31 of the inner member 13. It is formed.

  The groove portions 31, 32 extend to the outer peripheral upper end portion of the inner member 13 and the inner peripheral upper end portion of the outer member 14, and both ends of the cable 30 housed in the respective groove portions 31, 32 are connected to the rolling seal member 15. It is attached to the inner member 13 and the outer member 14 at substantially the same position as the attachment site. Accordingly, the inner member 13 and the outer member 14 are relatively displaced in the opposing direction, and the inner peripheral portion 15b and the outer peripheral portion 15a of the rolling seal member 15 are within the horizontal gap S with respect to the outer periphery of the inner member 13 and the outer periphery of the outer member 14. When alternately raised and lowered, they are raised and lowered synchronously.

  Further, the outer member 14 that moves relative to the base 12 has a vertical translation device 40 as a guide member that moves and guides the outer member 14 in a direction perpendicular to the base 12 (vertical direction) as shown in FIG. Provided. The vertical translation device 40 is configured by using a pantograph mechanism as shown in FIG. 6, and rotates in parallel with a pair of parallel intermediate bars 41, 42 arranged horizontally and outside the intermediate bars 41, 42. A plurality of first arms 43, 44 that are movably supported and tilted upward, and a plurality of second arms that are pivotally mounted inside the pair of intermediate bars 41, 42 and tilted upward. Arms 45 and 46 are provided. At this time, the first arms 43 and 44 are arranged so that their inclination directions are reversed, and the second arms 45 and 46 are also arranged such that their inclination directions are reversed.

  The lower ends of the first arms 43 and 44 are pivotally attached to the base 12, and the upper ends of the second arms 45 and 46 are pivotally attached to the lower end of the peripheral wall 14b of the outer member 14. It is done. The vertical translation device 40 is formed in a straight line, and four vertical translation devices 40 are provided as shown in FIG. 2, and each of them is provided between the inner member 13 and the outer member 14. The portion is arranged in a rectangular shape so as to hang over the outer member 14. Accordingly, the outer member 14 is only allowed to move in the vertical direction by the vertical translation device 40, and the horizontal movement and rotation of the outer member 14 are restricted.

  With the above configuration, in the vibration isolator 10 of the present embodiment, the pressure of the air spring 11 is changed in the air chamber 16 with the vertical relative displacement between the inner member 13 and the outer member 14, and the spring action at this time The building is made longer. At this time, the larger the volume of the air chamber 16 is, the larger the relative displacement between the base 12 and the object to be isolated can be accommodated, and the increase in the volume of the air chamber 16 increases the height of the air spring 10. It is preferable that this is achieved. Here, in this embodiment, since the inner member 13 is formed as a hollow cylinder having an open upper end, the inside of the hollow portion 13b of the inner member 13 is communicated with the air chamber 16 through the opening 13a. The hollow portion 13 b can be used as a part of the air chamber 16. Therefore, the volume of the air chamber 16 can be increased by adding the volume of the hollow portion 13b of the inner member 13, and the height of the air spring 10 can be lowered. Stability can be increased.

  Further, since the uneven portion 20 is formed on the outer periphery of the inner member 13 and the inner peripheral portion 15b of the rolling seal member 15 is moved up and down along the uneven portion 20, the inner periphery of the rolling seal member 15 is The peripheral length of the portion 15 b can be made closer to or equal to the peripheral length of the outer peripheral portion 15 a of the rolling seal member 15 along the outer member 14. For this reason, when the inner peripheral portion 15b along the outer periphery of the inner member 13 is pulled up to the inner periphery of the outer member 14 due to the input of vertical vibration, and conversely, along the inner periphery of the outer member 14 When the outer peripheral portion 15a is pulled toward the outer periphery of the inner member 13 by being lowered, it is possible to prevent an excessive deformation force from acting on the rolling seal member 15, so that the behavior of the raising and lowering can be performed smoothly. Become. In particular, when the outer peripheral portion 15a of the rolling seal member 15 is drawn to the inner member 13 from the state along the outer member 14, it is possible to prevent loosening and prevent wrinkles, and durability due to the formation of the wrinkles. Deterioration can be prevented.

  Further, the rolling seal member 15 has a folded portion 15c disposed between the inner member 13 and the outer member 14, and a large tensile force acts on the folded portion 15c due to the pressure in the air chamber 16. However, the folded portion 15 c is supported by the cable 30 disposed along the outer surface of the folded portion 15 c, and the pressure in the air chamber 16 can be received by the cable 30. Accordingly, it is possible to prevent the folded portion 15c from being excessively expanded due to air pressure. In particular, the rolling seal member 15 is burdened by providing a large number of cables 30 at intervals in the circumferential direction as in this embodiment. It is possible to further reduce the influence of the air pressure to increase the durability of the rolling seal member 15 and to ensure the rigidity of the rolling seal member 15 to exert a predetermined spring force. Therefore, when the diameter difference between the inner member 13 and the outer member 14 is increased in order to increase the volume of the air chamber 16, the pressure receiving area of the folded portion 15c is increased. Since the 15 folded portions 15c can be prevented from excessively bulging and deforming, the air spring 11 can be smoothly operated.

  Further, since the cable 30 is housed in the grooves 31 and 32 formed in the inner member 13 and the outer member 14, the cable 30 is prevented from protruding from the outer periphery of the inner member 13 and the inner periphery of the outer member 14. be able to. Accordingly, since the rolling seal member 15 can be smoothly pressed against the outer periphery of the inner member 13 and the inner periphery of the outer member 14, the cable 30 becomes a protrusion and generates local stress on the rolling seal member 15. And the durability of the rolling seal member 15 can be prevented from being lowered.

  By the way, the cable 30 itself has a predetermined rigidity, and in the present embodiment, the cable 30 is arranged at equal intervals in the circumferential direction, and is stored in the grooves 31 and 32, respectively. With respect to the relative movement of the inner member 13 and the outer member 14 in the horizontal direction, the cable 30 disposed in the direction perpendicular to the movement becomes a movement resistance in a state where the cable 30 is locked to the grooves 31 and 32.

  Further, in the present embodiment, the outer member 14 is restricted from horizontal movement and rotation through the vertical translation device 40 disposed between the outer member 14 and the base 12, and only the vertical movement is allowed. Therefore, the rocking vibration of the building can be prevented.

  FIG. 7 is a longitudinal sectional view of an air spring showing another embodiment, in which the same components as those in the above embodiment are given the same reference numerals and redundant description is omitted. That is, in this embodiment, a linear guide 50 is used as a guide member, and the linear guide 50 includes an outer periphery of the peripheral wall 14b of the outer member 14 and a support member 51 that is arranged to face the outer peripheral wall 14b and is erected vertically from the base 12. Composed between. Further, the linear guide 50 is arranged not only in the left-right direction of the air spring 10 but also in the front-rear direction which is a direction perpendicular to the paper surface (not shown). Or it can also comprise as a ring so that circumference wall 14b may be surrounded.

  Therefore, even in this embodiment, the inner member 13 and the outer member 14 are restricted in relative movement in the horizontal direction by the linear guide 50 and allowed only relative movement in the vertical direction. Rocking vibration can be prevented.

  By the way, although the said air spring 11 provided the inner member 13 in the base 12 side and the outer member 14 in the building side which is an isolation object, these inner members 13 and the outer member 14 may be arrange | positioned reversely, In this case, guide members such as the vertical translation device 40 and the linear guide 50 are provided between the building side and the outer member 14.

  Further, in each of the above embodiments, the vibration isolation object has been described as a building. However, the present invention is not limited to this, and it is of course possible to target precision equipment and other equipment, devices, and articles that dislike vibration. .

  Furthermore, in the said embodiment, although the earthquake was illustrated and demonstrated as input vibration, of course, traffic vibration and daily vibration may be sufficient.

It is a longitudinal cross-sectional view of the rolling seal type | mold air spring used for the vibration isolator which shows one Embodiment of this invention. It is the sectional view on the AA line in FIG. 1 which shows one Embodiment of this invention. It is an expanded sectional view of the BB line in Drawing 1 showing one embodiment of the present invention. It is an expanded sectional view of the CC line in FIG. 3 which shows one Embodiment of this invention. It is the DD sectional view taken on the line in FIG. 2 which shows one Embodiment of this invention. It is an enlarged plan view of a guide member showing an embodiment of the present invention. It is a longitudinal cross-sectional view of the rolling seal type | mold air spring which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Isolation device 11 Air spring 12 Base 13 Inner member 13a Opening part 13b Hollow part 14 Outer member 15 Rolling seal member 15a Outer peripheral part 15b Inner peripheral part 15c Fold-up part 16 Air chamber 20 Concavity and convexity part 30 Cable 31, 32 Groove part 40 Vertically parallel Moving device (guide member)
50 Linear guide (guide member)
S Horizontal gap

Claims (2)

An inner member that is provided between a base to which vertical vibration is input and an object to be isolated above the base and protrudes from one of the base or the object to be isolated;
A hollow cylindrical outer member that protrudes from the other of the base or the vibration-isolating object toward one side and that surrounds the outer periphery of the inner member at an appropriate interval in the vertical and horizontal directions;
And one end as hanging horizontal gap between the outer periphery of the inner periphery and the inner member of the outer member is arranged to be folded so as to lie inside the other end, the inner member outer peripheral the one end Along with the inner member , the other end portion is airtightly attached to the outer member along the inner periphery of the outer member , and accompanying the vertical relative displacement between the base and the isolation object. The inner member and the outer member are displaced up and down in the horizontal gap according to the relative vertical displacement, and a gas-filled space can be formed from the horizontal gap between the outer member and the inner member. A flexible cylindrical rolling seal member,
In order to make the circumferential length of the one end portion and the other end portion of the rolling seal member equal, an uneven portion is formed in a portion of the outer periphery of the inner member where the one end portion is attached, and the one end portion is A vibration isolator characterized by being brought into close contact with the uneven portion.   2. A guide member for restricting horizontal relative displacement and guiding vertical relative displacement is provided between the inner member or the outer member protruding from the vibration isolation object and the base. The vibration isolator described in 1.

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