Vibration damping device

Abstract

To provide a vibration control device for improving workability in work for adjusting damping property and also improving the damping performance using a lighter weight.SOLUTION: A vibration control device 10 which is installed on a wall surface 100 arranged extending in the vertical direction includes a weight member 11, a plate spring 12 connected to the vertical upper side of the weight member 11, extending in the horizontal direction, and capable of freely vibrate in the direction perpendicular to the wall surface 100, a frame 13 fixed to the wall surface 100 while supporting the end on the vertical upper side of the plate spring 12, and an adjusting mechanism 14 connected to the frame 13 for changing the supporting position of the plate spring 12 to change a distance between the weight member 11 and the supporting position, Between the weight member 11 and the frame 13, an inertia mass mechanism 21 is provided consisting of a nut 22, a bolt 23, and rotary weight members 24, 25.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration damping device.

Background Art

[0002] Buildings such as iron towers, towers, and high-rise buildings are likely to generate large vibrations when they are subjected to strong winds such as typhoons or forces due to seismic vibrations. Therefore, a vibration damping device is known as something that absorbs and attenuates the vibration energy input to the building. The vibration damping device is provided, for example, on the wall of a building that vibrates left and right. As such a vibration damping device, for example, there is one described in the following patent document.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, a vibration damping device is configured using a weight and a spring member, etc. Also, the vibration damping device needs to adjust the damping characteristics by changing the mass of the weight or the spring constant of the spring member, or by changing the position of the weight or the length of the spring member according to the natural frequency of a vibrating body such as a wall. However, the conventional vibration damping device has a problem that the adjustment work of the damping characteristics is difficult and the workability is not good. Also, the conventional vibration damping device has a problem that since the installation space is small, the vibration damping device itself and the weight are small, and large damping characteristics cannot be obtained.

[0005] An object of the present invention is to solve the above-described problems and provide a vibration damping device that improves workability in the adjustment work of damping characteristics and improves damping performance with a lightweight weight.

Means for Solving the Problems

[0006] A vibration damping device for achieving the above objective is a vibration damping device installed on a wall surface that extends vertically, comprising: a weight member; a leaf spring connected to the vertically upper side of the weight member, extending vertically, and capable of vibrating in a direction perpendicular to the wall surface; a frame that supports the vertically upper end of the leaf spring and is fixed to the wall surface; and an adjustment mechanism connected to the frame, which changes the support position of the leaf spring and changes the distance between the weight member and the support position.

[0007] In a preferred embodiment of the vibration damping device of the present invention, the adjustment mechanism switches its position in the vertical direction, which is connected to the leaf spring, in steps, thereby changing the distance between the weight member and the support position in steps.

[0008] A preferred embodiment of the vibration damping device of the present invention includes an inertial mass mechanism that is rotatably supported on the frame, connected to the weight member, and converts the vibration force of the weight member in a direction perpendicular to the wall surface into a rotational direction.

[0009] In a preferred embodiment of the vibration damping device of the present invention, the inertial mass mechanism includes a nut fixed to the weight member, a bolt inserted into the nut and rotating in accordance with the movement of the nut, with both ends rotatably supported by the frame, and a rotating weight member that rotates integrally with the bolt.

[0010] In a preferred embodiment of the vibration damping device of the present invention, the frame has an opening formed in a region corresponding to the movable range of the adjustment mechanism, and a door installed in the opening.

[0011] A preferred embodiment of the vibration damping device of the present invention includes a damping mechanism positioned vertically below the weight member, which dampens vibrations in a direction perpendicular to the wall surface of the weight member. [Effects of the Invention]

[0012] The vibration damping device of the present invention improves work efficiency in the adjustment of damping characteristics and improves damping performance with a lightweight weight. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a vertical cross-sectional view (cross-sectional view II in Figure 2) showing the vibration damping device of this embodiment. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1, showing the vibration damping device. [Modes for carrying out the invention]

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the present invention is not limited by these embodiments. Furthermore, the components in the embodiments include those that are easily conceivable by those skilled in the art, those that are substantially identical, and so-called equivalents. In addition, if there are multiple embodiments, they may be constructed by combining each embodiment.

[0015] [Embodiment] Figure 1 is a vertical cross-sectional view (section II in Figure 2) showing the vibration damping device of this embodiment, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1 showing the vibration damping device.

[0016] <Configuration of vibration damping device> As shown in Figures 1 and 2, the vibration damping device 10 of this embodiment is installed on a wall surface 100 that is aligned vertically. The wall surface 100 may be inclined with respect to the vertical direction. Furthermore, the vibration damping device 10 is not limited to the wall surface 100, but may also be installed on a vertical beam or the like.

[0017] The vibration damping device 10 includes a weight member 11, a leaf spring 12, a frame 13, and an adjustment mechanism 14. The vibration damping device 10 also includes an inertial mass mechanism 21.

[0018] Frame 13 has a hollow rectangular shape along the vertical direction, and a plurality (four in this embodiment) of mounting portions 31 are provided at the upper and lower portions. Frame 13 has a rectangular shape in which the sides along the vertical direction are longer than the sides along the horizontal direction. Frame 13 is fixed by fastening the plurality of mounting portions 31 to the wall surface 100 with bolts 32. Frame 13 has a support frame 33 and a cover frame 34. The support frame 33 has a shape with an opening on one side in the horizontal direction (the left side in FIG. 2), and the cover frame 34 has a shape with an opening on the other side in the vertical direction (the right side in FIG. 2). The support frame 33 is provided with a plurality of mounting portions 31 and is fixed to the wall surface 100. The cover frame 34 is arranged on one side of the support frame 33 and is integrally fixed to the support frame 33 by, for example, a plurality of ports (not shown).

[0019] Frame 13 forms a hollow shape by integrally fixing the support frame 33 and the cover frame 34. That is, the support frame 33 has a support portion 33a and side wall portions 33b, and the cover frame 34 has a cover portion 34a and side wall portions 34b. The support portion 33a and the cover portion 34a have the same-diameter rectangular shapes and are positioned opposite to each other in the horizontal direction. The side wall portions 33b and the side wall portions 34b have the same-diameter rectangular frame shapes along the horizontal and vertical directions and are positioned opposite to each other in the horizontal direction.

[0020] A support portion 35 is arranged inside the frame 13. The support portion 35 is integrally provided inside the upper portion of the frame 13. The support portion 35 is integrally provided on the inner surface at the upper part in the vertical direction of the support frame 33. The support portion 35 has a block shape with a horizontally long rectangular shape and is arranged in close contact with the support portion 33a and the side wall portions 33b at the upper part of the support frame 33. One end surface in the horizontal direction of the support portion 35 has the same position as the one end surface of the side wall portion 33b of the support frame 33 and is continuous without a step. Note that the frame 13 and the support portion 35 may be formed separately and fixed integrally, or may be formed integrally.

[0021] The leaf spring 12 is arranged vertically inside the frame 13. The leaf spring 12 has two leaf spring members 41, 42. That is, the leaf spring 12 is composed of a plurality of leaf spring members 41, 42. However, the number of leaf spring members 41, 42 constituting the leaf spring 12 is not limited to two, and may be one or three or more. The leaf spring members 41, 42 have the same shape. That is, the leaf spring members 41, 42 have a horizontal thickness direction, are arranged facing the wall surface 100, and can deform and vibrate in the horizontal direction (thickness direction) perpendicular to the wall surface 100. The leaf spring members 41, 42 are arranged inside the frame 13 at intervals in the width direction which is horizontal. The upper ends of the leaf spring members 41, 42 as the leaf spring 12 in the longitudinal direction (extending direction) are fixed to the support portion 35 of the frame 13 by bolts 43, 44.

[0022] The weight member 11 is provided vertically below the leaf spring 12. The weight member 11 is arranged vertically inside the frame 13 in the same manner as the leaf spring 12. The leaf spring 12 is arranged vertically above the weight member 11. The weight member 11 has a rectangular plate shape and is thicker than the thickness of the leaf spring 12. The lower end of the leaf spring 12 in the longitudinal direction (extending direction) is connected to the upper end of the weight member 11. That is, the weight member 11 is provided with a notch 51 at the middle portion in the thickness direction at the upper end. The notch 51 is provided along the width direction of the weight member 11, is open upward in the vertical direction, and has a thickness slightly thicker than the thickness of the leaf spring 12. The leaf spring members 41, 42 as the leaf spring 12 are inserted into the notch 51 of the weight member 11 at the lower ends in the longitudinal direction (extending direction), and are fixed to the weight member 11 by bolts 45, 46.

[0023] The adjustment mechanism 14 is connected to the frame 13. The adjustment mechanism 14 changes the support position of the leaf spring 12 and changes the distance between the weight member 11 and the support position. That is, the adjustment mechanism 14 changes the distance between the weight member 11 and the support position step by step by switching the position step by step in the vertical direction connected to the leaf spring 12.

[0024] The adjustment mechanism 14 is provided on the frame 13 and is capable of supporting the leaf spring members 41 and 42, which constitute the leaf spring 12. That is, the adjustment mechanism 14 is capable of supporting the intermediate portions in the longitudinal direction of the leaf spring members 41 and 42, which are positioned between the support portion 35 and the weight member 11, on the frame 13. The adjustment mechanism 14 is movable along the longitudinal direction of the leaf spring members 41 and 42 and can support a predetermined position of the leaf spring members 41 and 42 in the longitudinal direction and connect to the frame. The adjustment mechanism 14 has a support body 61, a plurality of (four in this embodiment) support bolts 62, a plurality of (two in this embodiment) connecting bolts 63, and a plurality of adjustment screw portions 64.

[0025] The support body 61 has a pair of support members 61a and 61b. The support members 61a and 61b are positioned along the width direction of the leaf spring members 41 and 42 on the front and back sides of the leaf spring members 41 and 42, and sandwich the leaf spring members 41 and 42 from both sides. With the support members 61a and 61b sandwiching the leaf spring members 41 and 42 from both sides, the longitudinal ends of the support members 61a and 61b can be integrally connected by a plurality of support bolts 62. That is, when the plurality of support bolts 62 are tightened, the support members 61a and 61b sandwich the leaf spring members 41 and 42 and are integrally connected to the leaf spring members 41 and 42. On the other hand, when the plurality of support bolts 62 are loosened, the sandwiching of the leaf spring members 41 and 42 is released, and the support members 61a and 61b become movable relative to the leaf spring members 41 and 42.

[0026] The two connecting bolts 63 extend between the leaf spring members 41 and 42, passing through the support members 61a and 61b from the surface side of the support body 61 and extending toward the support frame 33. The multiple adjustment screw portions 64 are female threads and are formed on the inner surface of the support frame 33. The multiple adjustment screw portions 64 are formed in pairs, spaced apart in the width direction of the leaf spring 12. Multiple pairs of these paired adjustment screw portions 64 are arranged spaced apart in the longitudinal direction of the leaf spring 12. The tips of the two connecting bolts 63 that pass through the support members 61a and 61b can be screwed into any two of the multiple adjustment screw portions 64.

[0027] In the adjustment mechanism 14, first, the connecting bolt 63 is rotated to release the screw from the adjustment screw portion 64, thereby releasing the support body 61 from the frame 13. Next, the support bolt 62 is loosened to release the clamping of the leaf spring members 41 and 42 by the support members 61a and 61b. Then, the support body 61 (support members 61a and 61b) is moved along the longitudinal direction (vertical direction) of the leaf spring members 41 and 42 and stops at a predetermined position. At this point, the support bolt 62 is tightened to clamp the leaf spring members 41 and 42 by the support members 61a and 61b. Subsequently, the connecting bolt 63 is rotated and screwed into the adjustment screw portion 64, connecting the support body 61 to the frame 13.

[0028] The adjustment mechanism 14 changes the support position of the leaf spring 12 by the support 61 relative to the frame 13, thereby changing the distance between the weight member 11 and the support position. By adjusting the position of the support 61 connected to the frame 13 relative to the leaf spring 12, the distance between the weight member 11 and the support position of the leaf spring 12 by the support 61 can be changed. Here, the support position of the leaf spring 12 is the position where the support 61 supporting the leaf spring 12 is connected to the support frame 33, and the distance is the shortest distance between the weight member 11 and the support position.

[0029] The adjustment mechanism 14 changes the distance between the weight member 11 and the support position by changing the support position of the leaf spring 12 by the support body 61. In this embodiment, the support body 61 is provided with a connecting bolt 63, and the support frame 33 is provided with multiple adjustment screw portions 64 that can be screwed into the connecting bolt 63, spaced apart in the longitudinal direction of the leaf spring 12. Therefore, the adjustment mechanism 14 can change the distance between the weight member 11 and the support position of the leaf spring 12 by the support body 61 in steps. However, the adjustment mechanism 14 is not limited to this configuration. For example, the multiple adjustment screw portions 64 on the support frame 33 may be eliminated, and the support body 61 may be connected to the support frame 33 by pressing the tip of the connecting bolt 63 provided on the support body 61 against the inner surface of the support frame 33, thereby allowing the distance between the weight member 11 and the support position of the leaf spring 12 by the support body 61 to be changed continuously.

[0030] The frame 13 is provided with an opening 36 and a door 37 in the cover frame 34. The opening 36 is formed in a region of the cover frame 34 that corresponds to the movable range of the adjustment mechanism 14. That is, the opening 36 is provided in a region in which at least the support 61 can be connected to the support frame 33, i.e., in a region opposite to the multiple adjustment screw portions 64. The door 37 is positioned in the opening 36 and can be opened and closed. The door 37 can be connected to the cover frame 34 by a locking device (e.g., a bolt) (not shown) when the opening 36 is closed.

[0031] The inertial mass mechanism 21 is rotatably supported on the frame 13 and connected to the weight member 11. The inertial mass mechanism 21 converts the vibrational force of the weight member 11 in a direction perpendicular to the wall surface 100 into a rotational force. The inertial mass mechanism 21 includes a nut 22, a bolt 23, rotating weight members 24, 25, and bearings 26, 27. The nut 22 is fixed to the weight member 11 at a position along the axis O perpendicular to the wall surface 100. The bolt 23 is positioned along the axis O and inserted into and screwed into the nut 22. One end of the bolt 23 in the axial direction is rotatably supported by a bearing 26 fixed to the support frame 33, and the other end in the axial direction is rotatably supported by a bearing 27 fixed to the cover frame 34. It is preferable that the rotating weight members 24 and 25 have the same disc shape and have the same dimensions and weight. The rotating weight member 24 is fixed to the bolt 23 between the nut 22 and the bearing 26, and rotates integrally with the bolt 23. The rotating weight member 25 is fixed to the bolt 23 between the nut 22 and the bearing 27, and rotates integrally with the bolt 23.

[0032] Therefore, when the weight member 11 moves along the direction of the axis O perpendicular to the wall surface 100, the nut 22 fixed to the weight member 11 moves in the same direction. As a result, the bolt 23 screwed into the nut 22 rotates because its axial movement is restricted, and the rotating weight members 24 and 25 fixed to the bolt 23 rotate in the same direction. In other words, the inertial mass mechanism 21 converts the horizontal linear movement (vibration) of the weight member 11 into rotational movement of the rotating weight members 24 and 25 by the nut 22 and bolt 23.

[0033] Furthermore, the vibration damping device 10 has a damping mechanism 15. The damping mechanism 15 is positioned vertically below the weight member 11. The damping mechanism 15 dampens horizontal vibrations perpendicular to the wall surface 100 of the weight member 11. That is, the damping mechanism 15 has a case 71, a viscous body 72, and a shaft portion 73. The case 71 is fixed below the weight member 11 to the lower inner surface of the side wall portions 33b, 34b of the frame 13. The top of the case 71 is open. The case 71 is filled with a viscous body 72. The viscous body 72 is a fluid or an elastic body, etc. The shaft portion 73 is fixed to the lower part of the weight member 11. The shaft portion 73 extends downward from the weight member 11, and its tip is inserted into the viscous body 72 filled in the case 71.

[0034] The configuration of the damping mechanism 15 described above is merely an example and is not limited to this configuration. The damping mechanism 15 may be, for example, a spring or elastic body provided between the weight member 11 and the support frame 33.

[0035] <Operation of vibration damping device> As shown in Figures 1 and 2, when the wall surface 100 vibrates from side to side (horizontally), the frame 13 fixed to the wall surface 100 vibrates from side to side as a whole. The vibration of the frame 13 is transmitted to the leaf spring 12 via the internal support 61, and then from the leaf spring 12 to the weight member 11. At this time, the leaf spring 12 deforms by bending from side to side at its lower end, with the upper end (support position) supported by the support 61 connected to the frame 13 acting as a fulcrum, causing the weight member 11 to reciprocate from side to side. Here, the horizontal vibration of the wall surface 100 is absorbed and damped as the leaf spring 12 deforms synchronously with the weight member 11 to reciprocate horizontally in response to the horizontal vibration of the wall surface 100. In addition, the weight member 11 moves from side to side within the viscous material 72 of the case 71, to which multiple shaft portions 73 fixed to the lower part are fixed. Therefore, the left-right vibration of the weight member 11 is damped by the viscous material 72.

[0036] Furthermore, when the weight member 11 reciprocates from side to side, the nut 22 fixed to the weight member 11 moves horizontally. As a result, the bolt 23 screwed into the nut 22 rotates without moving axially, and the rotating weight members 24 and 25 fixed to the bolt 23 rotate. Consequently, the rotating weight members 24 and 25 rotate due to the horizontal vibration of the weight member 11. By designing them to rotate significantly in response to horizontal vibration, a large inertial mass can be obtained even if the weight of the rotating weight members 24 and 25 is small. In other words, even as a vibration damping device 10, the weight becomes the inertial mass of the weight member 11 and the rotating weight members 24 and 25, and the apparent weight becomes larger than when the weight member 11 is alone. As a result, the damping characteristics of the vibration damping device 10 are improved.

[0037] <Adjusting the natural frequency> For the vibration damping device 10 to operate properly, it is necessary to match (synchronize) the natural frequency of the wall surface 100 with the natural frequency of the vibration damping device 10. In this embodiment, the vibration damping device 10 changes the effective length over which the leaf spring 12 deforms by changing the support position of the upper end of the leaf spring 12, thereby changing the natural frequency of the vibration damping device 10 and matching it with the natural frequency of the wall surface 100.

[0038] First, the door 37 is removed from the frame 13, allowing the adjustment mechanism 14 to be adjusted from the opening 36. Then, the connecting bolt 63 and the adjustment screw portion 64 are unscrewed to release the support body 61 from the frame 13. Next, the support bolt 62 is loosened to release the clamping of the leaf spring members 41 and 42 by the support members 61a and 61b. Then, the support body 61 is moved along the longitudinal direction of the leaf spring members 41 and 42, and at the predetermined position, the support bolt 62 clamps the leaf spring members 41 and 42 with the support members 61a and 61b. Finally, the connecting bolt 63 is screwed into the adjustment screw portion 64 to connect the support body 61 to the frame 13. After that, the door 37 is attached to the frame 13 and the opening 36 is closed.

[0039] For example, as shown in Figure 2, the support 61 is fixed at the position indicated by the solid line. In this case, the upper end of the leaf spring 12 is supported by the frame 13 via the support 61. Therefore, the distance along the vertical direction from the weight member 11 to the support 61 (connecting bolt 63), which is the support position of the upper end of the leaf spring 12, is distance L1.

[0040] Furthermore, the support 61 is moved downward and fixed in the position shown by the dashed line. At this time, the upper end of the leaf spring 12 is supported by the frame 13 via the support 61. Therefore, the vertical distance from the weight member 11 to the support 61 (connecting bolt 63), which is the support position of the upper end of the leaf spring 12, is shorter than the distance L1, resulting in a distance L2.

[0041] The vibration damping device 10 changes the stiffness of the leaf spring 12 and thus its natural frequency when the distances L1 and L2 from the weight member 11 to the support position of the upper end of the leaf spring 12 are changed. In other words, the natural frequency of the vibration damping device 10 can be adjusted to match the natural frequency of the wall surface 100 simply by the worker moving the support 61 using the adjustment mechanism 14, thereby improving work efficiency.

[0042] [Effects of this embodiment] The vibration damping device of this embodiment is a vibration damping device 10 installed on a wall surface 100 that extends in the vertical direction, and comprises a weight member 11, a leaf spring 12 connected to the vertically upper side of the weight member 11, extending in the vertical direction and capable of vibrating in a direction perpendicular to the wall surface 100, a frame 13 that supports the vertically upper end of the leaf spring 12 and is fixed to the wall surface 100, and an adjustment mechanism 14 connected to the frame 13 that changes the support position of the leaf spring 12 and changes the distance between the weight member 11 and the support position.

[0043] According to the vibration damping device of this embodiment, the support position of the leaf spring 12 can be changed by the adjustment mechanism 14, thereby changing the distance between the weight member 11 and the support position. By changing the distance between the weight member 11 and the support position, the natural frequency of the vibration damping device 10 can be changed. As a result, the workability in adjusting the damping characteristics can be improved, and the damping performance can be improved with a lightweight weight member 11.

[0044] In this embodiment, the vibration damping device uses an adjustment mechanism 14 that is connected to the leaf spring 12, and the position of the adjustment mechanism 14 is switched in stages in the vertical direction to change the distance between the weight member 11 and the support position in stages. Therefore, the distance between the weight member 11 and the support position can be easily changed.

[0045] The vibration damping device of this embodiment has an inertial mass mechanism 21 that is rotatably supported on a frame 13, connected to a weight member 11, and converts the force of vibration of the weight member 11 in a direction perpendicular to the wall surface 100 into a rotational direction. Therefore, by converting the horizontal vibration of the weight member 11 into a rotational direction by the inertial mass mechanism 21, the apparent weight of the vibrating weight becomes larger, and the vibration of the weight member 11 can be efficiently dampened, which can improve the damping characteristics or enable miniaturization and weight reduction of the weight member 11.

[0046] The vibration damping device of this embodiment includes, as an inertial mass mechanism 21, a nut 22 fixed to the weight member 11, a bolt 23 inserted into the nut 22 and rotating in accordance with the movement of the nut 22, with both ends rotatably supported by the frame 13, and rotating weight members 24 and 25 that rotate integrally with the bolt 23. Therefore, when the weight member 11 vibrates horizontally, the nut 22 moves horizontally together with the weight member 11, the bolt 23 rotates in accordance with the movement of the nut 22, and the rotating weight members 24 and 25, which are integral with the bolt 23, rotate, thereby appropriately converting the horizontal vibration in the weight member 11 into a rotational direction. If the bolt 23 is designed to rotate significantly in response to the horizontal movement of the nut 22, a large inertial mass can be obtained even if the weight of the rotating weight members 24 and 25 is small. In other words, even as a vibration damping device 10, the weight becomes the inertial mass of the weight member 11 and the rotating weight members 24 and 25, and the apparent weight becomes larger than when the weight member 11 is alone. As a result, the damping characteristics of the vibration damping device 10 can be improved, or the weight member 11 can be miniaturized.

[0047] In this embodiment, the vibration damping device is provided with an opening 36 formed in the frame 13 in a region corresponding to the movable range of the adjustment mechanism 14, and a door 37 installed in the opening 36. Therefore, the adjustment of the natural frequency by the adjustment mechanism 14 can be easily performed, thereby improving work efficiency.

[0048] The vibration damping device of this embodiment has a damping mechanism 15 positioned vertically below the weight member 11, which dampens vibrations in a direction perpendicular to the wall surface 100 of the weight member 11. Therefore, the damping mechanism 15 can dampen the vertical movement of the weight member 11 and the leaf spring 12 at an early stage. [Explanation of symbols]

[0049] 10. Vibration damping device 11 Weight member 12 leaf springs 13 frames 14 Adjustment mechanism 15 Damping mechanism 21 Inertial mass mechanism 22 nuts 23 volts 24,25 Rotating weight member 26,27 Bearings 31 Mounting part 32 volts 33 Support Frame 34 Cover Frames 35 Support part 36 Aperture 37 Doors 41,42 Leaf spring member 43, 44, 45, 46 bolts 51 Notch 61 support 61a, 61b Support members 62 Support bolts 63 Connecting bolts 64 Adjustment screw part 71 cases 72 Viscous body 73 Shaft 100 Wall surfaces

Claims

1. A vibration damping device installed on a wall surface that extends vertically, Weight member and A leaf spring is connected to the vertically upper side of the weight member, extends vertically, and is capable of vibrating in a direction perpendicular to the wall surface. A frame that supports the vertically upper end of the leaf spring and is fixed to the wall surface, A vibration damping device comprising an adjustment mechanism connected to the frame, which changes the support position of the leaf spring and changes the distance between the weight member and the support position.

2. The vibration damping device according to claim 1, wherein the adjustment mechanism switches its vertical position in steps, connecting to the leaf spring, to change the distance between the weight member and the support position in steps.

3. The vibration damping device according to claim 1 or claim 2, which is rotatably supported on the frame, connected to the weight member, and has an inertial mass mechanism that converts the force of vibration of the weight member in a direction perpendicular to the wall surface into a rotational direction.

4. The aforementioned inertial mass mechanism includes a nut fixed to the weight member, A bolt inserted into the nut, which rotates in accordance with the movement of the nut, and whose ends are rotatably supported by the frame, The vibration damping device according to claim 3, further comprising a rotating weight member that rotates integrally with the bolt.

5. The vibration damping device according to claim 1, wherein the frame has an opening formed in a region corresponding to the movable range of the adjustment mechanism, and a door installed in the opening.

6. The vibration damping device according to claim 1, further comprising a damping mechanism positioned vertically below the weight member and damping vibrations in a direction perpendicular to the wall surface of the weight member.

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