JP3349374B2 - Vibration isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator suitably used for display cases and the like, and more particularly, to an improvement of a vibration isolator having a vibration isolating function against all horizontal vibrations including rotation. It is related to.

[0002]

2. Description of the Related Art As a conventional vibration isolator of this type, for example, as shown in FIG. 9, a lower rail 101 provided on a base 100 in the X direction in FIG. An intermediate table 102 movably mounted on the intermediate table 102, an upper rail 103 provided on the intermediate table 102 in a direction intersecting with the lower rail 101 (Y direction in the figure), and a horizontal line along the upper rail 103. Body 10 movably provided on
4 is known. With such a configuration, the apparatus main body 104 can be isolated from any horizontal linear motion applied to the base 100 due to an earthquake or the like, so that the display case is placed on the apparatus main body 104. For example, it is used for the purpose of preventing an exhibit from falling down due to an earthquake. In addition, a lower elastic body 105 for returning the position of the intermediate base 102 to the base 100 to a fixed position is disposed between the intermediate base 102 and the base 100 along the lower rail 101, and the lower part of the apparatus main body 104 with respect to the intermediate base 102 is By disposing the upper elastic body 106 for returning the position to the home position along the upper rail 103 between the intermediate base 102 and the apparatus main body 104, the relative positional relationship between the base 100 and the apparatus main body 104 after the vibration is obtained. It is designed to slowly return to the home position.

[0003]

However, in such a structure, not only is it difficult to absorb the vibration applied to the base 100 in a diagonal direction other than the direction along the upper and lower rails 101 and 103, but also in the rotational direction. Is not absorbed at all and is directly transmitted to the apparatus main body 104.
Therefore, in this configuration, there is a serious problem that it is difficult to exhibit the vibration isolating function with respect to the vibration in the oblique direction, and it is not possible to exhibit the vibration isolating function at all when the vibration includes a rotation direction component. The present invention has been made in view of the above situation, and has an object to provide a vibration isolation function against all horizontal vibrations including rotation.

[0004]

In order to achieve the above object, the present invention reduces the sliding resistance of the apparatus main body with respect to the ground and moves the apparatus main body on the base in any horizontal direction including rotation. In order to ensure that the main body of the device returns to its home position relative to the base not only for linear movement of the base but also for rotational movement after the vibration, In this case, a torque arm having a large return force is provided to apply a torque sufficient to return the apparatus body to the initial position.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the vibration isolator of the present invention
A base installed on the floor, an apparatus main body mounted on the base movably in any horizontal direction and provided with an exhibition case, and a position return mechanism for returning the position of the apparatus main body to the base to an initial position. The position return mechanism fixes an operation body on a shaft provided on the base, and arranges a plurality of the supports on an inner wall surface of the apparatus main body so as to surround the operation body. Each of the working bodies is connected to each other by an elastic body extending in a substantially horizontal radial direction, and at the initial position, the combined force of all the elastic bodies acting on the working body is balanced in the horizontal direction, and each of the working bodies acts on the working body. A plurality of action points of the force of the elastic body are provided, and the directions of the respective forces are different so that they do not cross at one point.

In order to easily realize the above-mentioned structure, the position return mechanism is provided so as to protrude above the base and is inserted into the inside of the apparatus main body from the lower surface of the apparatus main body, and substantially horizontally with respect to the axis of the shaft. The working body provided with a plurality of action points radially, and a plurality of the support body fixed to the inner wall surface of the device body,
It is preferable that a plurality of elastic members are connected to each other to connect each of the support members and two action points nearest to the support member.

[0007] In particular, as a specific embodiment for further simplifying the adjustment of the balance of the resultant force, the pair of elastic members may be formed in a V-shape in plan view with the support side being the vertex. In addition, when the device body and the base are in the shape of a quadrangular prism, to improve the simplicity of manufacturing
It is desirable that four of the action points are provided and four of the support members are provided, and four sets of the pair of elastic bodies are provided corresponding to the respective support members.

[0008] As a specific material of the elastic body, a coil spring having various tensions is preferable because it is easily available. Further, in order to change the responsiveness to vibration and exhibit an optimal vibration isolation function, a device provided with a damper mechanism for suppressing the relative movement speed between the device main body and the base is preferable.

Particularly, in order to simplify the structure of the damper mechanism and to prevent the apparatus main body from falling down from the base by preventing excessive movement of the apparatus main body with respect to the base, the upper surface provided on the base is opened at the upper surface. It is preferable that the device has a cylindrical housing filled with a viscous fluid therein, and a column provided at the lower portion of the apparatus main body and having a lower end movably immersed in the viscous fluid of the housing.

As a specific measure for reducing the sliding resistance of the apparatus main body on the base so as to be able to move in any horizontal direction, a non-directional rolling element is provided between the base and the apparatus main body. Laying thing is good.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the vibration isolator includes a base 1 installed on a floor, an apparatus main body 2 mounted on the base 1 so as to be movable in any horizontal direction, and an apparatus main body 2 with respect to the base 1. The apparatus includes a position return mechanism 3 for returning a position to an initial position, and a damper mechanism 8 for suppressing a relative movement speed of the apparatus main body 2 with respect to the base 1.

The base 1 is in the shape of a quadrangular prism, and a free bear 9 as a non-directional rolling element is laid on the upper surface thereof. Further, the shaft 7 is protruded above the central portion of the upper surface, the upper surface is opened at the tip, and a cylindrical housing 81 filled with a viscous fluid 83 such as silicon is fixed inside. In the present embodiment, the apparatus main body 2 is
The display case 21 is provided with a display case 21 on the upper part as shown in FIG.
A case base 22 provided at the lower part of the display case 21 is hollow inside, and a lower surface 2a of the case base 22, which is a lower surface of the apparatus main body.
Is provided with a hole 23 into which the housing 81 can be inserted.
Then, the housing 81 is inserted into the hole 23 and the case base 2 is inserted.
2 by contacting the lower surface 2a with the free bear 9
The apparatus main body 2 can be moved on the base 1 in any horizontal direction. In addition, the four fall prevention plates 10 are extended from the inner wall surface of the case base 22 so as to surround the housing 81, and their respective tips are arranged so as to approach the lower part of the housing 81, respectively. ,
When the apparatus main body 2 is tilted, the overturn prevention plate 10 is hooked on the lower surface of the housing 81 to prevent the apparatus main body 2 from overturning.

As shown in FIGS. 1 and 4, the position return mechanism 3 has four arms extending point-symmetrically with respect to the axis 7L, and has hook holes 41 serving as action points at the ends thereof. The thin plate-shaped working body 4 is fixedly mounted on the shaft 7, and the thin plate-shaped supporting body 5 is fixedly mounted at each corner of the inner wall surface 2 b of the apparatus so as to surround the working body 4. Two adjacent operation points 41 are connected by a pair of coil springs 6, respectively. More specifically, a pair of coil springs 6 are extended from each support 5 to the nearest adjacent action point 41 so as to form a V-shape in plan view with the support 5 side as a vertex. In the initial position, as shown in FIG. 4, a total of four sets of coil springs 6 are arranged in a star shape in plan view having four vertices point-symmetric about the axis 7. At this time, each arm of the operating body 4 is located in a direction opposing each inner wall surface 2b of the case base 22.

The damper mechanism 8 comprises a housing 81 as shown in FIG. 1 or FIG. 2 and a columnar body 82 immersed in the housing 81 from above at a position where the apparatus main body 2 is mounted on the base 1. Is done. The cylindrical body 82 is suspended from the beam 24 laid on the upper part of the case base 22, and the relative movement speed between the apparatus main body 2 and the base 1 is suppressed by the resistance of the viscous fluid 83 accompanying the movement of the cylindrical body 82. Like that.

The operation of this embodiment with such a configuration will be described. The vibration isolator is in the state shown in FIG. 2 or FIG. 4 in the initial position, and the forces f of the coil springs 6 acting on the working body 4 are balanced. The directions of these forces f are different so that they do not intersect at one point, as is apparent from FIG. When the base 1 is moved in the direction A with a certain acceleration or more from this state due to an earthquake or the like, since the apparatus main body 2 can move with respect to the base 1, it tries to stop at that place by inertia, and FIG. State. When the base 1 stops in this state, the apparatus main body 2 gradually returns to the initial position with respect to the base 1 by the combined force F of the coil spring 6 and the action of the damper mechanism 8. The same applies to the case where the vibration direction is the direction B. In this case, the state gradually returns to the initial position from the state shown in FIG. That is, the horizontal and linear motion vibrations applied to the base 1 in all directions are not directly transmitted to the apparatus main body 2, and the vibration isolation function of gently moving the apparatus main body 2 acts. When the base 1 rotates in the direction C, the state shown in FIG. 4 to FIG. 7 is obtained. In this case, as shown in FIG. Is the torque T for returning the apparatus main body 2 to the initial position, and the vibration isolating function acts on the vibration in the rotation direction. After all, according to the present embodiment, as shown in FIG.
It also has a vibration isolation function against vibrations caused by a combination of rotation vibrations. In other words, the vibration isolator according to the present invention converts any horizontal vibration given to the main body of the base 1 to the mass of the main body 2 and the expansion / contraction force f of the coil spring 6,
The damper mechanism 8 has an anti-vibration function of attenuating by an interaction such as a damper action and transmitting the damping to the apparatus main body 2.

With such a structure, as described above, not only can all vibrations applied to the base 1 in the horizontal direction be attenuated, but also the damping characteristics of the expansion / contraction force f of the coil spring 6 or It can be varied by adjusting the damper action by the damper mechanism 8. Therefore,
Even when the vibration damping characteristic changes due to the weight of the object to be vibration-isolated, the same vibration-isolation function can always be exerted by adjusting the tension of the coil spring 6 or the damper action. Of course, it is easy to make the damping characteristics completely different so that the most vibration-isolating effect can be exerted against completely different vibrations other than an earthquake. Also, a pair of coil springs 6
Has a V-shape in plan view, and the tension of the coil springs 6 for each pair is adjusted after the coil springs 6 have the same characteristics, so that it is easy to adjust and balance the tension.

As described above, since the directions of all the forces f of the coil springs 6 acting on the respective application points 41 are not crossed at one point, each of the coil springs 6 is positioned with respect to the axis 7L shown in FIG. 6, the torque arm TL always has a magnitude equal to or greater than a certain value. That is, even when the expansion / contraction force f of the coil spring 6 is reduced for the purpose of applying the vibration isolation function to low-frequency vibrations, the return represented by the product of the expansion / contraction force f of the coil spring 6 and the torque arm TL. The torque T can be made sufficiently large, and the position can be reliably returned.

As shown in FIG. 1, the damper mechanism 8 not only relates to the above-described vibration damping characteristics, but also includes a cylindrical body 81 in a cylindrical housing 81 filled with a viscous fluid 83 therein.
Is immersed in the main body 2, it is possible to simultaneously have a function of suppressing excessive movement of the apparatus main body 2 with respect to the base 1 by bringing the cylindrical body 82 into contact with the inner wall surface of the housing 81.

The present invention is not limited only to the above-described embodiment. For example, the point of action and the number of supports are not limited to four. That is, when the vibration isolator has a triangular prism shape, the number of action points and the number of supports may be three, or the number may be changed according to the shape of the device. Further, it is a matter of course that these working bodies or supporting bodies may be provided integrally with the apparatus main body or the base. In addition, the elastic body is not limited to the coil spring, but may be rubber or the like as long as the vibration isolator is small. Alternatively, a material having a larger elasticity may be applied. Furthermore, the method of stretching these elastic bodies is as follows:
At the initial position, the combined forces of all the elastic bodies acting on the working body are balanced in the horizontal direction, and a plurality of action points of the forces of the respective elastic bodies acting on the working body are provided, and the directions of the respective forces intersect at one point. What is necessary is just to make it different so that it does not exist. For example, as shown in FIG. 10, a pair of elastic bodies 60 may be arranged substantially in parallel, and a plurality of pairs of these elastic bodies may be provided radially. The damper mechanism is not limited to the embodiment. For example, a structure in which a damper cylinder or the like is arranged in series with each elastic body can be considered.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0021]

The present invention is embodied in the form described above and has the following effects. That is, the anti-vibration device of the present invention includes a base installed on the floor, and a display mounted on the base movably in any horizontal direction.
An apparatus main body having a case, and a position return mechanism for returning the position of the apparatus main body with respect to the base to an initial position, the position return mechanism fixing an operation body on a shaft provided on the base, The inner wall of the main unit so as to surround the body
A plurality of the support members are disposed on the surface, and each support member and the operating member are connected by an elastic member extending in a substantially horizontal radial direction, and all the elastic members acting on the operating member in the initial position are used. Since the resultant force is balanced in the horizontal direction, and a plurality of action points of the force of each elastic body acting on the action body are provided, and the directions of the respective forces are different so that they do not cross at one point, an earthquake, etc. Therefore, even if the base installed on the floor vibrates in all directions in the horizontal direction, and especially if the vibration involves rotation, the main body is movable in the horizontal direction with respect to the base. A so-called vibration isolation function can be provided without directly transmitting the vibration to the main body.

The position return mechanism may include a shaft protruding above the base and inserted into the inside of the apparatus main body from the lower surface of the apparatus main body, and a plurality of action points provided substantially radially with respect to the axis of the shaft. A plurality of elastic bodies, each of which includes an operating body and a plurality of the supports fixed to an inner wall surface of the apparatus main body, and connects each of the supports and two adjacent operation points closest to the supporting body. As long as it is assembled, the structure can be simplified,
Manufacturing becomes easier.

Further, if the pair of elastic bodies have a V-shape in a plan view with the support side being the apex, adjustment of the balance of the combined force and the like can be further simplified. In particular, if the four action points are provided and the four support members are provided, and the pair of elastic bodies are provided in four sets corresponding to the respective support members, the apparatus main body and the base have a quadrangular prism shape. If it is, the simplicity of manufacture can be improved.

If the elastic body is a coil spring, one having various tensions is easily available, the tension can be easily adjusted, and the vibration isolation function can be easily adjusted. In addition, if the device is provided with a damper mechanism for suppressing the relative movement speed between the device main body and the base, in order to adjust the vibration isolating function, the response to vibration is changed together with the adjustment of the tension of the elastic body, and the It becomes easier to exert a proper vibration isolation function.

In particular, the damper mechanism is provided on the upper part of the base and has a cylindrical housing filled with a viscous fluid with an open upper surface, and the lower end provided on the lower part of the apparatus main body floats in the viscous fluid of the housing. If it is provided with a cylindrical body that is immersed as much as possible, a function of preventing excessive movement of the device main body with respect to the base and preventing the device main body from falling off the base can be provided.

If a non-directional rolling element is laid between the base and the apparatus main body, the apparatus main body can be easily moved in an arbitrary horizontal direction on the base.

[Brief description of the drawings]

FIG. 1 is a schematic overall perspective view of a vibration isolator according to an embodiment of the present invention.

FIG. 2 is a schematic central longitudinal sectional view of the vibration isolator of the embodiment.

FIG. 3 is a drawing during operation in FIG. 2;

FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a drawing during operation in FIG. 4;

FIG. 6 is a drawing during operation in FIG. 4;

FIG. 7 is a drawing during operation in FIG. 4;

FIG. 8 is a drawing during operation in FIG. 4;

FIG. 9 is a schematic overall perspective view of a vibration isolator showing a conventional example.

FIG. 10 is a schematic plan sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Device main body 2a ... Device main body lower surface 2b ... Device main body inner wall surface 3 ... Position return mechanism 4 ... Working body 41 ... Working point (hook hole) 5 ... Support 6 ... Elastic body (coil spring) 7 ... Shaft 7L ... Axis 8 ... Damper mechanism 81 ... Housing 82 ... Cylinder 83 ... Viscous fluid 9 ... rolling element (free bear)

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-315650 (JP, A) JP-A-63-199941 (JP, A) JP-A-61-14357 (JP, A) JP-A-3-315 87464 (JP, A) JP-A-9-280313 (JP, A) JP-A 8-247215 (JP, A)

Claims (8)

(57) [Claims] 1. A base installed on a floor, and a display case mounted on the base so as to be movable in an arbitrary horizontal direction.
And a position return mechanism for returning the position of the apparatus body with respect to the base to an initial position. The position return mechanism fixes an operation body to a shaft provided on the base and surrounds the operation body. A plurality of the supports are arranged on the inner wall surface of the apparatus body, and each support and the operating body are connected to each other by an elastic body stretched in a substantially horizontal radial direction, and act on the operating body at an initial position. To make the combined force of all the elastic bodies to be balanced in the horizontal direction, and to provide a plurality of action points of the force of each elastic body acting on the acting body,
A vibration isolator, wherein the directions of the respective forces are different so as not to intersect at one point. 2. The apparatus according to claim 1, wherein said position return mechanism is provided with a shaft protruding above the base and inserted into the apparatus main body from a lower surface of the apparatus main body, and a plurality of action points provided substantially radially with respect to the axis of said shaft. A plurality of elastic bodies, each of which includes an operating body and a plurality of the supports fixed to an inner wall surface of the apparatus main body, and connects each of the supports and two adjacent operation points closest to the supporting body. 2. The vibration isolator according to claim 1, wherein the vibration isolator is assembled. 3. The vibration isolator according to claim 2, wherein the pair of elastic bodies form a V-shape in plan view with the support side being a vertex. 4. The vibration isolator according to claim 2, wherein four action points are provided and four support members are provided, and four sets of said pair of elastic members are provided corresponding to each support member. . 5. An apparatus according to claim 1, wherein said elastic body is a coil spring.
The vibration isolator according to 2, 3, or 4. 6. A device according to claim 1, further comprising a damper mechanism for suppressing a relative moving speed between the apparatus main body and the base.
The vibration isolator described. 7. A damper mechanism provided on an upper portion of a base and having a top surface opened and filled with a viscous fluid inside, and a lower portion provided on a lower portion of the apparatus main body and having a lower end provided in the viscous fluid of the housing. 7. The vibration isolator according to claim 6, further comprising: a cylindrical body movably immersed in the cylindrical body, and having a function of suppressing a relative moving speed between the apparatus main body and the base by resistance of a viscous fluid accompanying the movement of the cylindrical body. 8. An apparatus according to claim 1, wherein a non-directional rolling element is laid between the base and the apparatus main body, so that the apparatus main body can be moved in an arbitrary horizontal direction on the base.
The vibration isolator according to 3, 4, 5, 6, or 7.