JP3188384U - Anti-vibration table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolator capable of reducing vibration and impact transmitted to a floor surface while simplifying a structure and suppressing a manufacturing cost. SOLUTION: A lower surface side of a rigid plate 21 having a predetermined rigidity is supported by a film-like bulging portion 25 that tapers from one side to the other side. Therefore, even when the bulging portion 25 is made of a rubber-like elastic body having a hardness high enough to be appropriately compressed with respect to the maximum load assumed at the time of playing, the other side of the bulging portion 25 can be easily formed. Can be elastically deformed. Further, as the load applied to the bulging portion 25 increases, a large load is required to elastically deform the bulging portion 25, so that it is possible to avoid excessive compression of the bulging portion 25. The bulging portion 25 can reduce the transmission of vibration and impact to the floor surface F while simplifying the structure of the main body portion 22 and suppressing the manufacturing cost. [Selection diagram] Fig. 6

Description

  The present invention relates to an anti-vibration table, and more particularly to an anti-vibration table that can reduce vibration and impact transmitted to a floor surface while simplifying the structure and suppressing manufacturing costs.

  Vigorous vibrations and impacts are applied to the stand that supports the percussion instrument and the kick pedal used when the percussion instrument is hit. For this reason, when a percussion instrument is played with these stand and kick pedals in contact with the floor, vibration and impact are directly transmitted to the floor, which causes noise from the floor. It becomes.

  As one of the means for reducing the noise generated from the floor surface, a vibration absorbing member is interposed between the vibrating body and the floor surface so that the vibration or impact applied to the vibrating body can be reduced. Techniques for suppressing the transmission of are generally known.

  In Patent Document 1, a plurality of leg members 12 (main body portions) formed of a vibration absorbing material are distributed on the back surface of a base plate 11 (rigid plate) on which a pedal 32 (kick pedal) of an electronic drum 30 can be mounted. Techniques to do this are disclosed.

Japanese Patent Laid-Open No. 11-24660 (FIG. 2 etc.)

  However, in the technique disclosed in Patent Document 1, when the leg member 12 is formed of a vibration absorbing material having low hardness, the leg member 12 is excessively compressed and transmitted from the vibrating body when a large load is applied. There was a problem that vibrations and shocks were transmitted to the floor without being sufficiently damped. On the other hand, in order to properly compress the leg member 12 with respect to the assumed maximum load, it is necessary to form the leg member 12 with a vibration absorber having a high hardness, and therefore vibration transmitted from the vibrating body to the floor surface. And there is a problem that the impact cannot be reduced sufficiently.

  In addition to the leg member 12, the technique disclosed in Patent Document 1 is provided with vibration insulation and shock by interposing a sound insulation sheet 17 between the upper plywood 14 and the lower plywood of the base plate 11 and the particle board 16. Since attenuation was attempted, there was a problem that the structure was complicated and the manufacturing cost increased.

  The present invention has been made to solve the above-described problems, and is a vibration isolator capable of reducing vibration and impact transmission to the floor surface while playing a musical instrument while simplifying the structure and suppressing manufacturing costs. The purpose is to provide.

Means for solving the problems and effects of the device

  According to the vibration isolator according to claim 1, the vibration or impact applied to the vibrating body can be applied to the rigid plate and the vibration body by placing the vibrating body on the rigid plate in a state where the main body is grounded to the floor surface. It is transmitted to the floor surface through the main body. Since the rigid plate is supported on one side or the other side of the film-like bulge formed on the main body, vibrations and impacts applied from the vibrating body are transmitted to the bulge.

  Since the bulging portion is tapered from one side to the other side, the bulging portion bulges from a rubber-like elastic body that is so hard that it can be properly compressed with respect to the maximum load assumed during performance. Even if it is a case where a part is comprised, the other side of a bulging part can be easily elastically deformed. That is, the bulging portion can be easily elastically deformed with a small load while avoiding excessive compression of the bulging portion when a large load is applied.

  Therefore, there is an effect that the bulging portion can reduce the vibration and impact imparted to the vibrating body from being transmitted to the floor surface while simplifying the structure of the main body portion and suppressing the manufacturing cost. As a result, it is possible to reduce noise generated from the floor when playing a musical instrument.

  Further, since the rigid plate is formed in a plate shape having a predetermined rigidity and the lower surface side of the rigid plate is supported by one side or the other side of the plurality of bulging portions, the load applied to the rigid plate is applied to the plurality of bulging portions. It can be evenly distributed at the exit. Therefore, there is an effect that it is possible to suppress that some of the bulging portions are excessively compressed when a large load is applied.

  According to the vibration isolator according to claim 2, in addition to the effect of the vibration isolator according to claim 1, the rigid plate is made of a metal material, so that the rigidity of the rigid plate can be secured while ensuring the rigidity of the rigid plate. The thickness dimension can be reduced. Thereby, there is an effect that it is possible to avoid that the height position of the vibrating body placed on the rigid plate from the floor surface becomes too high.

  According to the vibration isolator according to claim 3, in addition to the effect of the vibration isolator according to claim 1 or 2, since the bulging portions are arranged at at least four corners of the rigid plate, Thus, the rigid plate can be stably supported. Therefore, there is an effect that wobbling of the vibrating body placed on the rigid plate can be suppressed.

  According to the vibration isolator according to claim 4, in addition to the effect of the vibration isolator according to claim 3, the number of the bulging portions is set to 6 or more, so that the load applied from the vibrating body There is an effect that the rigid plate can be prevented from being bent.

  In addition, since the number of bulging portions is set to 16 or less, each bulging portion can be easily elastically deformed easily by a load applied from a vibrating body placed on a rigid plate. There is an effect that can be done.

  According to the vibration isolator according to claim 5, in addition to the effect of the vibration isolator according to any one of claims 1 to 4, the hardness of the rubber-like elastic body constituting the bulging portion is set to 50 degrees or more. Therefore, there is an effect that the bulging portion can be prevented from being excessively compressed by the maximum load assumed to be applied.

  Moreover, since the hardness of the rubber-like elastic body constituting the bulging portion is set to 80 degrees or less, each bulging portion can be easily elastically deformed by a load applied from the vibrating body. effective.

  According to the vibration isolator according to claim 6, in addition to the effect produced by the vibration isolator according to any one of claims 1 to 5, the allowable maximum weight of the vibrator that can be placed on the rigid plate is Since it is set to 4 kg or less per one, it is possible to avoid over-compressing the bulging part, and as a result, the effect of suppressing the vibration applied to the vibrating body and the transmission of the impact to the floor surface can be suppressed. is there.

  According to the vibration isolator according to claim 7, in addition to the effect exerted by the vibration isolator according to any one of claims 1 to 6, when the load applied to the bulging portion is a predetermined value or less, Since the bulging portion can be proportionally displaced (compressed) with respect to the applied load, there is an effect that the bulging portion can be easily elastically deformed with a small load.

  On the other hand, when the load applied to the bulging portion exceeds a predetermined value, the bulging portion can be displaced (compressed) in an N-order function with respect to the applied load. As a result, it is possible to easily prevent the bulging portion from being excessively compressed.

  According to the vibration isolator according to claim 8, in addition to the effect of the vibration isolator according to claim 7, the bulging portion is formed in a dome shape, so that the other side of the bulging portion can be easily formed with a small load. There is an effect that the bulging portion can be easily prevented from being excessively compressed with respect to a large load applied from the vibrating body.

  According to the vibration isolator described in claim 9, in addition to the effect produced by the vibration isolator described in claim 8, the thickness dimension of the bulging portion is set to 1/10 or more of the radius of curvature of the bulging portion. Therefore, it is possible to sufficiently secure the thickness dimension of the bulging portion, to appropriately compress the bulging portion with respect to the assumed maximum load, and to suppress the plastic deformation of the bulging portion. .

  Moreover, since the thickness dimension of the bulging part is set to 1/4 or less of the curvature radius of the bulging part, the bulging part can be easily elastically deformed with a small load.

  According to the vibration isolator according to claim 10, in addition to the effect of the vibration isolator according to claim 8 or 9, by changing the thickness dimension of the bulging portion from one side to the other side, There is an effect that the displacement characteristic of the bulging portion can be arbitrarily adjusted.

  According to the vibration isolator described in claim 11, in addition to the effect produced by the vibration isolator according to any one of claims 1 to 10, a plurality of bulging portions are integrally bulged and formed in the covering portion. Therefore, compared with the case where a plurality of bulges are individually formed, there is an effect that the number of work steps for mounting the bulges on the rigid plate can be reduced.

  According to the vibration isolator described in claim 12, in addition to the effect produced by the vibration isolator described in claim 11, the rigid plate is surrounded by the standing portion standing along the peripheral portion on the one surface side of the covering portion. Therefore, there is an effect that the displacement of the rigid plate with respect to the covering portion can be regulated by the standing portion.

  According to the vibration isolator according to claim 13, in addition to the effect of the vibration isolator according to claim 12, since the main body is divided into two or more, each divided main body is handled in a reduced size. It can be made easier. Therefore, there is an effect that the work of mounting the rigid plate on the main body can be simplified.

  According to the vibration isolator according to claim 14, in addition to the effect exerted by the vibration isolator according to any one of claims 11 to 13, the rigid plate is supported on one side of the bulging portion. The other side of the part can be grounded to the floor surface. Therefore, the contact area between the bulging portion and the floor surface can be increased as the load applied to the bulging portion increases.

  Thereby, when the load given to a bulging part is small, there exists an effect that the contact area of the bulging part with respect to a floor surface can be made small, and the vibration and impact transmitted to a floor surface can be reduced.

  Moreover, when the load provided to a bulging part is large, the contact area of the bulging part with respect to a floor surface can be increased, and the grip force of the bulging part with respect to a floor surface can be heightened. As a result, there is an effect that it is possible to suppress the movement of the bulging portion with respect to the floor surface.

  According to the vibration isolator according to claim 15, in addition to the effect of the vibration isolator according to claim 14, the inside and the outside of the bulging portion are communicated with each other via the groove-shaped portion and the communication hole. When the bulging portion is pressed against the floor, the air inside the bulging portion can be smoothly discharged to the outside. Therefore, there is an effect that it is possible to suppress the elastic deformation of the bulging portion from being inhibited by the air pressure.

  According to the vibration isolator according to claim 16, in addition to the effect produced by the vibration isolator according to claim 14 or 15, since the protruding portion protrudes from the outer surface of the bulging portion, the bulging portion with respect to the floor surface There is an effect that the grip power of can be increased.

  According to the vibration isolator according to claim 17, in addition to the effect of the vibration isolator according to claim 16, the protrusion is formed concentrically when viewed from the other side of the bulge. When a large load is applied to the bulged portion and the bulging portion is compressed, more protrusions can be grounded to the floor surface. Therefore, even when a large load is applied, it is possible to suppress the bulging portion from moving with respect to the floor surface by increasing the grip force with respect to the floor surface.

  According to the vibration isolator according to claim 18, in addition to the effect produced by the vibration isolator according to any one of claims 1 to 17, the rigid plate is formed in a rectangular shape in a top view. There is an effect that it is possible to prevent a gap from being formed between adjacent rigid plates when using a plurality of the plates side by side.

  According to the vibration isolator according to claim 19, in addition to the effect of the vibration isolator according to any one of claims 1 to 17, the rigid plate is formed in a trapezoidal shape when viewed from above. The shape can be approximate to the shape of the pedal. Therefore, there is an effect that it is possible to save the space of the vibration isolator.

It is a side view of the bass drum and kick pedal which were mounted in the 1st anti-vibration stand and the 2nd anti-vibration stand in 1st Embodiment. (A) is a top view of the first vibration isolation table, and (b) is a bottom view of the first vibration isolation table. (A) is the partial expanded bottom view of the 1st vibration isolator which expanded the IIIa part of FIG.2 (b), (b) is the 1st vibration isolator in the IIIb-IIIb line | wire of Fig.2 (a). FIG. It is a top view of a main-body part. It is the elements on larger scale of the 1st vibration isolator which expanded the V section of FIG. (A) And (b) is the elements on larger scale of a 1st vibration isolator. (A) is a top view of a 2nd vibration isolator, (b) is sectional drawing of the 2nd vibration isolator in the VIIb-VIIb line of Fig.7 (a), (c) is 2nd It is a bottom view of a vibration isolator, (d) is sectional drawing of a 2nd vibration isolator. It is a graph which shows the test result of a compression test. (A) is a side view of the 2nd vibration isolator in 2nd Embodiment, (b) is sectional drawing of the 2nd vibration isolator in the IXb-IXb line | wire of Fig.9 (a). (A) is a partial expanded bottom view of the main-body part in 3rd Embodiment, (b) is sectional drawing of the main-body part in the Xb-Xb line | wire of Fig.10 (a). (A) is the bottom view of the main-body part in 4th Embodiment, (b) is the partial expanded bottom view of a main-body part, (c) is in the XIc-XIc line | wire of FIG.11 (b). It is sectional drawing of a main-body part, (d) is sectional drawing of the main-body part in the XId-XId line | wire of FIG.11 (b).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG. 1, a schematic configuration of the first vibration isolation table 20 and the second vibration isolation table 40 in the first embodiment of the present invention will be described. FIG. 1 is a side view of the bass drum 1 and the kick pedal 2 placed on the first vibration isolation table 20 and the second vibration isolation table 40 in the first embodiment.

  As shown in FIG. 1, a bass drum 1 is an electronic percussion instrument imitating an acoustic percussion instrument, and includes a drum main body 11 hit by a player and a sensor (not shown) that detects that the drum main body 11 has been hit. And a support stand 12 connected to the outer peripheral surface of the drum main body 11. The support stand 12 is a member for supporting the drum body 11 in a state where it floats from the floor surface F, and includes a plate stand 13 formed in a plate shape and a rod stand 14 formed in a rod shape.

  The kick pedal 2 includes a plate-like base portion 2a, a pedal portion 2b supported by the base portion 2a so as to be swingable, and a rotating portion 2c that rotates in conjunction with the pedal 2b. The beater 3 is fixed to 2c. The kick pedal 2 has a base 2 a fixed to a plate stand 13, and when the player depresses the pedal 2 b, the beater 3 rotates in conjunction with the depressing, and the beater 3 strikes the drum body 11. Is done.

  The bass drum 1 and the kick pedal 2 are installed on a first vibration isolation table 20 and a second vibration isolation table 40 that are grounded to the floor surface F.

  The first anti-vibration table 20 and the second anti-vibration table 40 are devices for suppressing vibrations and shocks applied to the bass drum 1 and the kick pedal 2 from being transmitted to the floor surface F. A plate stand 13 of the bass drum 1 and the base 2a of the kick pedal 2 are mounted on the shaking table 20, and a bar stand 14 of the bass drum 1 is mounted on the second vibration isolation table 40, respectively.

  Next, the first vibration isolation table 20 will be described with reference to FIGS. FIG. 2A is a top view of the first vibration isolation table 20, and FIG. 2B is a bottom view of the first vibration isolation table 20. FIG. 3A is a partially enlarged bottom view of the first vibration isolation table 20 in which the IIIa portion of FIG. 2B is enlarged, and FIG. 3B is taken along the line IIIb-IIIb of FIG. FIG. 3 is a cross-sectional view of the first vibration isolation table 20. FIG. 4 is a top view of the main body 22.

  As shown in FIGS. 2 to 4, the first vibration isolation table 20 includes a rectangular plate-like rigid plate 21 made of an iron plate having a predetermined rigidity, and the rigid plate 21 in a state where the rigid plate 21 is floated from the floor surface F. And a main body 22 to be supported.

  Since the rigid plate 21 is formed in a rectangular plate shape, it is possible to prevent a gap from being formed between the adjacent rigid plates 21 when a plurality of first vibration isolation tables 20 are used side by side. . A carpet (not shown) is covered on the upper surface of the rigid plate 21 (the surface on the front side in FIG. 2A).

  The main body portion 22 is made of EPDM rubber having a hardness of 60 degrees, which is higher in elasticity than the rigid plate 21, and in the width direction (vertical direction in FIG. 2 (a)) at the central portion in the longitudinal direction (FIG. 2 (a) left-right direction). It is divided into two along. In FIG. 4, only one side of the main body 22 divided into two parts is shown, and the other side is not shown.

  The main body portion 22 includes a rectangular plate-shaped covering portion 23, a standing portion 24 standing on one side of the covering portion 23 (upper surface side in FIG. 3B), and the other surface side of the covering portion 23 (see FIG. 3 (b) a plurality of bulging portions 25 formed to bulge on the lower surface side.

  The covering portion 23 is a portion that covers the lower surface side (the lower surface side in FIG. 3B) of the rigid plate 21, and the dimension and the width direction (FIG. 2) in the longitudinal direction of the covering portion 23 (the left-right direction in FIG. 2B). The dimension in (b) vertical direction) is set to be slightly larger than the dimension in the longitudinal direction and the dimension in the width direction of the rigid plate 21, respectively.

  The standing portions 24 are erected along the peripheral edge portion of the covering portion 23, and the interval between the standing portions 24 arranged facing the longitudinal direction or the width direction of the covering portion 23 is set so that the rigid plate 21. The dimension in the longitudinal direction or the dimension in the width dimension is set to be approximately the same. Further, the standing portion 24 is formed with an overhanging portion 24a projecting from the upper end thereof toward the inside of the covering portion 23, and a gap is formed between the overhanging portion 24a and the covering portion 23. The peripheral portion of the rigid plate 21 and the carpet (not shown) is inserted into the gap.

  In a state in which the rigid plate 21 is inserted into the gap between the covering portion 23 and the overhanging portion 24a, the rigid plate 21 is surrounded by the standing portion 24. Therefore, the displacement of the rigid plate 21 is caused by the covering portion 23 and the standing portion 24. Can be regulated by. Accordingly, it is possible to prevent the displacement of the rigid plate 21 and the carpet with respect to the main body portion 22.

  Therefore, when attaching the rigid plate 21 to the main body 22, it is possible to simplify the fixing operation using other materials such as bolts and adhesives, so that the operation of attaching the rigid plate 21 to the main body 22 can be simplified.

  Here, when the rigid plate 21 and the carpet are inserted into the gap between the covering portion 23 and the overhanging portion 24a, the gap between the covering portion 23 and the overhanging portion 24a is widened, and the periphery of the rigid plate 21 and the carpet is inserted into the gap. Although the entire part can be inserted, the insertion work is complicated. In particular, the rigid plate 21 needs to be set to a size at which at least the plate stand 13 of the bass drum 1 and the base 2b (see FIG. 1) of the kick pedal 2 can be placed, and in the longitudinal direction and the width direction of the rigid plate 21. The greater the length dimension, the greater the effort required for the insertion work.

  On the other hand, since the main body 22 is divided into two, each divided main body 22 can be reduced in size and easily handled. Furthermore, the rigid plate 21 can be attached to the main body portion 22 by inserting the rigid plate 21 into the gap between the overhanging portion 24a and the covering portion 23 from the divided part (the upper side in FIG. 4) of the main body portion 22. Therefore, the mounting work can be simplified.

  The bulging portion 25 is a film-like portion formed in a hollow dome shape that tapers from one side to the other side, and the lower surface side of the rigid plate 21 is supported on one side of the bulging portion 25. .

  In the present embodiment, twelve bulging portions 25 are disposed in the main body portion 22 and are disposed at unequal intervals along the longitudinal direction of the covering portion 23 (the left-right direction in FIG. 2B). The six bulging portions 25 thus formed are arranged in parallel at the peripheral edge portions at the one end portion and the other end portion in the width direction of the covering portion 23 (the vertical direction in FIG. 2B).

  In addition, six bulging portions are integrally formed to bulge in each covering portion 23 of the main body portion 22 divided into two. Therefore, compared with the case where all the bulging parts 25 are formed individually, the work man-hour at the time of attaching the bulging part 25 to the rigid board 21 can be reduced. Further, the bulging portion 25 can be disposed at an appropriate position with respect to the rigid plate 21 by inserting the rigid plate 21 into the gap between the covering portion 23 and the standing portion 24. Therefore, the mounting work of the bulging portion 25 on the rigid plate 21 can be simplified.

  The interval between the bulging portions 25 adjacent in the longitudinal direction of the covering portion 23 is set narrow on the center side in the longitudinal direction of the covering portion 23 and wide on both end sides in the longitudinal direction. Thereby, when the load is given to the rigid board 21, it can suppress that the center part in the longitudinal direction of the rigid board 21 bends.

  Here, on one surface side (upper surface side in FIG. 3B) of the covering portion 23, a plurality of groove-like groove portions 26 that allow adjacent bulge portions 25 to communicate with each other are provided. Of the plurality of groove portions 26, the groove portion 26 extending along the width direction of the covering portion 23 (the vertical direction in FIG. 2B) includes the groove portion 26 and the other surface side of the covering portion 23 (FIG. 3). (B) A communication hole 27 that communicates with the lower surface side is formed along the thickness direction of the covering portion 23 (the vertical direction in FIG. 3B) (see FIG. 4).

  Thereby, since the inside and the outside of the bulging portion 25 formed in a hollow shape can be communicated via the groove portion 26 and the communication hole 27, the air inside the bulging portion 25 is smoothly discharged to the outside. be able to.

  Further, the bulging portion 25 has a protruding portion 28 that protrudes radially outward from the outer surface located on the other side from the other side of the bulging portion 25 (the front side of FIG. 3A). It is formed concentrically when viewed.

  Next, with reference to FIG. 5, the deformation | transformation aspect of the bulging part 25 in the state which mounted the bass drum 1 and the kick pedal 2 on the 1st vibration isolator 20 installed in the floor F is demonstrated. FIG. 5 is a partially enlarged side view of the first vibration isolator 20 in which the V portion of FIG. 1 is enlarged, and a state in which the rigid plate 21 and the main body portion 22 are viewed in cross-section is shown for easy understanding. .

  As shown in FIG. 5, when the bass drum 1 (see FIG. 1) and the kick pedal 2 are placed on the rigid plate 21 with the other side of the bulging portion 25 grounded to the floor surface F, these bass drums The rigid plate 21 is pressed toward the floor surface F by the weight of the 1 and the kick pedal 2, and the bulging portion 25 interposed between the rigid plate 21 and the floor surface F is compressed.

  At this time, since the rigid plate 21 is made of an iron plate having a predetermined rigidity, the rigid plate 21 can be prevented from being deformed by a load applied from the bass drum 1 and the kick pedal 2. Therefore, the bass drum 1 and the kick pedal 2 can be stably installed on the first vibration isolation table 20.

  Further, the rigid plate 21 is made of an iron plate having a predetermined rigidity, and the lower surface side of the rigid plate 21 is supported by the plurality of bulging portions 25, so that the load applied to the rigid plate 21 is plurally expanded. It can be evenly distributed in the outlet 25. That is, since it is possible to prevent the load from concentrating on some of the bulging portions 25 among the plurality of bulging portions 25, it is possible to suppress the partial bulging portions 25 from being excessively compressed and The rigid plate 21 can be stably supported by the bulging portion 25.

  Further, since the rigid plate 21 is made of an iron plate, the thickness dimension of the rigid plate 21 can be set small while ensuring the rigidity of the rigid plate 21. As a result, it is possible to avoid the height position of the kick pedal 2 installed on the rigid plate 21 from the floor surface F from becoming too high, thereby reducing the uncomfortable feeling given to the performer when the kick pedal 2 is depressed. Can be made.

  The bulging portion 25 interposed between the rigid plate 21 and the floor surface F is formed in a hollow shape tapering from one side to the other side, and the other side of the bulging portion 25 is grounded to the floor surface F. Therefore, the other side of each bulging portion 25 can be easily elastically deformed by a small load applied from the rigid plate 21. Thereby, since the ground-contact area of the floor surface F and the bulging part 25 can be increased, the 1st anti-vibration stand 20 can be stably installed with respect to the floor surface F. FIG. As a result, rattling of the first vibration isolator 20 can be prevented, and noise from the floor surface F generated due to the rattling can be reduced.

  Further, since the main body portion 22 is interposed between the floor surface F and the bass drum 1 (see FIG. 1), the bulging portion 25 suppresses the vibration of the floor surface F from being transmitted to the bass drum 1. can do. Therefore, it can be made easy to avoid erroneous detection of vibration transmitted from the floor surface F by a sensor (not shown) of the bass drum 1.

  Moreover, since the protrusion part 28 is protrudingly formed in the outer surface located in the other side of the bulging part 25, when the protrusion part 28 is grounded to the floor surface F, it is with respect to the floor surface F of the bulging part 25. Grip power can be increased. Therefore, it is possible to suppress the first vibration isolation table 20 from moving with respect to the floor surface F.

  Furthermore, the ground contact area of the bulging portion 25 with respect to the floor surface F can be reduced by grounding the protruding portion 25 to the floor surface F, compared to the case where the entire outer surface of the bulging portion 25 is grounded to the floor surface F. Can do. Thereby, it can suppress that a vibration and an impact are transmitted from the bulging part 25 to the floor surface F or from the floor surface F to the bulging part 25.

  Next, with reference to FIG. 6, the deformation | transformation aspect of the bulging part 25 when the kick pedal 2 is depressed is demonstrated. FIGS. 6A and 6B are partially enlarged views of the first vibration isolation table 20. 6A shows a state in which the pedal portion 2b is depressed and a downward load W1 is applied to the kick pedal 2. FIG. 6B shows a state in which the pedal portion 2b is depressed and the kick pedal 2b is depressed. 2 shows a state in which a load W2 is applied downward and forward, and a state in which the rigid plate 21 and the main body 22 are viewed in cross-section is shown for easy understanding.

  As shown in FIG. 6A, when the pedal portion 2b is depressed and a downward load W1 is applied to the kick pedal 2, a large vibration or impact is applied to the first vibration isolation table 20. The bulging portion 25 interposed between the rigid plate 21 and the floor surface F is further compressed.

  Since the bulging portion 25 is made of EPDM rubber having a hardness (according to JIS type A durometer, hereinafter the same) of 60 degrees, the bulging portion 25 can be prevented from being excessively compressed. That is, since the bulging portion 25 can be appropriately compressed with respect to the maximum load assumed at the time of performance, vibration and impact applied from the rigid plate 21 can be reduced by the bulging portion 25, and Plastic deformation of the bulging portion 25 can be suppressed.

  In addition, the site | part which mainly supports the load provided from the rigid board 21 is an outer edge part in the whole site | part which the bulging part 25 has earth | grounded. Therefore, the bulging portion 25 is compressed until the load necessary for compressing the outer edge portion and the load applied to the bulging portion 25 are balanced.

  Here, in the state before the kick pedal 2 is depressed (the state shown in FIG. 5), the outer edge portion of the entire portion where the bulging portion 25 is grounded to the floor surface F is the portion A and the load W1 is applied. In the state shown in FIG. 6A, the outer edge portion of the entire portion where the bulging portion 25 is grounded to the floor surface F is defined as a portion B.

  The bulging portion 25 is formed in a tapered shape as it goes from one side to the other side, and the portion A is located on the other side of the bulging portion 25 with respect to the portion B. Compared with the part B, the circumference of the outer edge part which contacts the floor surface F is short. That is, as the load applied to the bulging portion 25 increases and the contact area of the bulging portion 25 with respect to the floor surface F increases, the peripheral length of the outer edge portion that contacts the floor surface F increases, and the outer edge portion is compressed. A large load is required to achieve this. Therefore, the part A can be easily elastically deformed by a smaller load than the part B.

  Further, the bulging portion 25 is formed in a hollow dome shape, and the angle formed by the cross section passing through the portion A with respect to the floor surface F among the cross sections perpendicular to the radial direction of the bulging portion 25 is the portion B. The passing cross section is smaller than the angle formed with respect to the floor surface F. That is, as the load applied to the bulging portion 25 increases and the contact area of the bulging portion 25 with the floor surface F increases, the angle formed by the cross section passing through the outer edge portion that contacts the floor surface F with respect to the floor surface F. In order to compress the outer edge portion, a large load is required. Therefore, the part A can be easily elastically deformed by a smaller load than the part B.

  As described above, since the bulging portion 25 is formed in a hollow dome shape that tapers from one side to the other side, the hardness is such that it can be properly compressed with respect to the maximum load assumed during performance. Even when the bulging portion 25 is made of EPDM rubber having a high hardness of 60 degrees, the bulging portion 25 is elastically deformed with a small load applied to each bulging portion 25 from the rigid plate 21. Can do. Therefore, the bulging portion 25 can reduce the vibration and impact generated due to a small load from being transmitted from the rigid plate 21 to the floor surface F.

  On the other hand, the part B has a longer circumference of the outer edge portion that contacts the floor F than the part A, and the angle formed by the cross section passing through the part B with respect to the floor F is such that the cross section passing through the part A is the floor F. Therefore, a large load is required to elastically deform the portion B.

  That is, when a large load is applied to each bulging portion 25 from the rigid plate 21, it is easy to avoid the bulging portion 25 from being excessively compressed, and the bulging portion 25 is appropriately compressed. Can be made. Thereby, it is possible to reduce the vibration and impact generated due to the large load from being transmitted from the rigid plate 21 to the floor surface F by the bulging portion 25.

  As described above, the first vibration isolator 20 transmits the vibrations and shocks applied to the bass drum 1 and the kick pedal 2 to the floor surface F while simplifying the structure of the main body 22 and suppressing the manufacturing cost. This can be reduced by the bulging portion 25. As a result, noise generated from the floor surface F when playing a musical instrument can be reduced.

  Further, when the bulging portion 25 is compressed, the air inside the bulging portion 25 can be smoothly discharged to the outside through the groove portion 26 and the communication hole 27, so that the compression of the bulging portion 25 is inhibited by the air pressure. Can be prevented.

  Furthermore, since the lower surface side of the rigid plate 21 is supported on one surface side of the bulging portion 25 and the other surface side of the bulging portion 25 is grounded to the floor surface F, as the load applied to the bulging portion 25 increases. The ground contact area between the bulging portion 25 and the floor surface F can be increased.

  Therefore, when the load applied to the bulging portion 25 is small, the contact area of the bulging portion 25 with respect to the floor surface F can be reduced to reduce vibration and impact transmitted to the floor surface F. On the other hand, when the load applied to the bulging portion 25 is large, the ground contact area of the bulging portion 25 with respect to the floor surface F can be increased and the grip force of the bulging portion 25 with respect to the floor surface F can be increased. As a result, the bulging portion 25 can be prevented from moving with respect to the floor surface F.

  Further, since the protruding portion 28 is formed concentrically as viewed from the other side of the bulging portion 25, the contact area of the protruding portion 28 with respect to the floor surface F increases as the load applied to the bulging portion 25 increases. be able to.

  Furthermore, by forming the projecting portions 28 concentrically, the plurality of projecting portions 28 can be arranged along the radial direction of the bulging portion 25. Thereby, even when the contact area of the bulging portion 25 with respect to the floor surface F is increased, the protruding portion 28 is placed on the floor surface at the outer edge portion of the entire portion where the bulging portion 25 is grounded to the floor surface F. F can be easily grounded. Therefore, the grip force of the bulging portion 25 with respect to the floor surface F can be further increased.

  As shown in FIG. 6 (b), when a load W2 is applied downward and forward (left side in FIG. 6 (b)) to the kick pedal 2 as the player steps on, the rigid plate 21 and the covering portion are provided. 23 is displaced forward, and following this, one side of the bulging portion 25 is drawn forward.

  On the other hand, when the grip force of the protruding portion 28 with respect to the floor surface F is exhibited, the other side of the bulging portion 25 can be prevented from being dragged forward with respect to the floor surface F. Therefore, the application of the load W2 is released, and the bulging portion 25 is restored to the shape before the load W2 is applied, so that the position of the rigid plate 21 can be returned to the position before the load W2 is applied. it can. Thereby, it can suppress that the installation position of the bass drum 1 and the kick drum 2 moves from an initial position.

  Further, since the projecting portion 28 is formed concentrically, the bulging portion 25 is displaced when the rigid plate 21 and the covering portion 23 are displaced forward, and one side of the bulging portion 25 is displaced forward in accordance with the displacement. More protrusions 28 formed on the front side of the floor can be grounded to the floor surface F.

  That is, by forming the projecting portion 28 concentrically, the grip force of the bulging portion 25 against the floor surface F can be increased even when a large load in the front-rear and left-right directions is applied to the rigid plate 21. Since it can raise, it can suppress that the 1st vibration isolator 20 moves with respect to the floor surface F. FIG.

  In the present embodiment, twelve bulging portions 22 are formed in the main body portion 22, but the bulging portions 25 may be formed at least at the four corners of the rigid plate 21.

  By arranging the bulging portions 25 at least at the four corners of the rigid plate 21, the rigid plate 21 can be stably supported with respect to the floor surface F. Therefore, the bus placed on the first vibration isolator 20 It is possible to prevent the drum 1 and the kick pedal 2 from wobbling.

  Further, it is more desirable that the number of the bulging portions 25 formed in the main body portion 22 is in the range of 6 or more and 16 or less.

  By setting the number of the bulging portions 25 formed in the main body portion 22 to 6 or more, the bulging portions 25 are excessively compressed with respect to the maximum load assumed to be applied to the rigid plate 21. Can be easily avoided. Furthermore, four of the plurality of bulging portions 25 are arranged at the four corners of the rigid plate 21, and the other bulging portions 25 are arranged at least in the central portion in the longitudinal direction of the rigid plate 21, thereby It is possible to prevent the central portion from being bent.

  In addition, by setting the number of the bulging portions 25 formed in the main body portion 22 to 16 or less, each bulging portion 25 is elastically deformed even when the load applied to the rigid plate 21 is small. It can be made easy.

  Furthermore, it is desirable that the allowable maximum weight of the bass drum 1 and the kick drum 2 that can be placed on the rigid plate 21 is set to 4 kg or less per one bulging portion 25. Thereby, when the load is given to the bulging part 25, it can avoid that the bulging part 25 is compressed too much. As a result, vibrations and impacts applied to the bass drum 1 and the kick drum 2 can be suppressed from being transmitted to the floor surface F, and plastic deformation of the bulging portion 25 can be suppressed.

  Next, the second vibration isolator 40 will be described with reference to FIG. 7A is a top view of the second vibration isolation table 40, and FIG. 7B is a cross-sectional view of the second vibration isolation table 40 taken along line VIIb-VIIb of FIG. 7A. 7 (c) is a bottom view of the second vibration isolation table 40, and FIG. 7 (d) is a cross-sectional view of the second vibration isolation table 40. FIG. 7D corresponds to the cross section shown in FIG. 7B, and shows a state in which a downward load W3 is applied to the rigid plate 41. FIG.

  As shown in FIGS. 7A to 7C, the second vibration isolation table 40 includes a disc-shaped rigid plate 41 and a main body portion that supports the rigid plate 41 in a state of floating from the floor surface F. 42 is mainly provided.

  The rigid plate 41 is made of an iron plate having a predetermined rigidity, and the support portion 42 is made of EPDM rubber having a hardness of 60 degrees and higher elasticity than the rigid plate 41. The main body 42 includes a covering portion 43 that covers the rigid plate 41, a cylindrical tubular portion 44 that slides and supports the covering portion 43, and a rigid plate 41 and a covering portion that are accommodated in the tubular portion 44. And a bulging portion 45 disposed below 43.

  The covering portion 43 is erected along a disc-shaped disc portion 43a that covers the upper surface side of the rigid plate 41, and a peripheral portion on the lower surface side (the lower surface side in FIG. 7B) of the disk portion 43a. And an annular ring portion 43b that covers the peripheral portion of the rigid plate 41.

  The disc portion 43a is formed on the upper peripheral side of the upper surface side (the upper surface side in FIG. 7B) and is formed on the inner peripheral side of the engaging portion 43a1 and the substantially annular engaging portion 43a1 in top view. And a projecting surface portion 43a2 having a substantially circular shape when viewed from above, which protrudes upward from the locking portion 43a1.

  The locking portion 43a1 is a portion that is locked to the cylindrical portion 43, and the protruding surface portion 43a2 is a portion on which the bar stand 14 (see FIG. 1) is placed.

  In addition, the projecting surface portion 43a2 is formed in a tapered shape that slopes downward as its upper surface goes toward the center. Thereby, it can prevent that the stick stand 14 mounted in the upper surface of the protrusion part 43a2 slides down.

  The annular portion 43b is formed with a projecting portion 43c projecting from the lower end thereof toward the center of the disc portion 43a, and a gap is formed between the projecting portion 43c and the disc portion 43a. The peripheral portion of the rigid plate 41 is inserted into the gap. Thereby, the displacement of the rigid plate 41 with respect to the covering portion 43 can be restricted by the covering portion 43.

  The cylindrical portion 44 has a substantially annular regulating portion 46 that projects from the upper end thereof toward the radially inner side of the cylindrical portion 44, and the radially inner portion of the cylindrical portion 44 from the lower end of the cylindrical portion 44. And a support portion 47 having a substantially annular shape in bottom view that supports one side of the bulging portion 45.

  The restricting portion 46 is a portion where the engaging portion 43a1 of the covering portion 43 is engaged, and the inner diameter of the restricting portion 46 is set to be smaller than the outer diameter of the engaging portion 43a1. Thereby, it is possible to prevent the covering portion 43 that slides on the inner peripheral surface of the cylindrical portion 44 from slipping out from above the cylindrical portion 44.

  Further, since the projecting surface portion 43a2 of the covering portion 43 projects upward from the locking portion 43a1, it is easy to avoid the bar stand 14 placed on the projecting surface portion 43a2 from interfering with the cylindrical portion 44. Can do. Further, even when a support stand having a shape different from that of the bar stand 14 is placed on the projecting surface 43a2, interference between the support stand and the cylindrical portion 44 can be easily avoided. The versatility of the shaking table 40 can be improved.

  The support portion 47 is disposed so as to face the lower surface side of the rigid plate 41 with the bulging portion 45 interposed therebetween. The outer peripheral side of the support part 47 is connected to the inner peripheral surface of the cylindrical part 44, and the inner peripheral side of the support part 47 is connected to the bulging part 45.

  Further, on the lower surface side of the support portion 47, concentric protrusions 48a and 48b are formed to protrude from the inner peripheral side and the outer peripheral side of the support portion 47, respectively, and the protrusions 48a and 48b are grounded to the floor surface F. By doing so, the grip force of the support portion 47 with respect to the floor surface F can be increased.

  In addition, the support part 47 is formed in the taper shape in which the lower surface side inclines and slopes as it goes to an inner peripheral side from an outer peripheral side. Therefore, in a state where no load is applied to the rigid plate 41, the protruding portion 48a located on the outer peripheral side of the support portion 47 is grounded to the floor surface F, and the protruding portion 48b positioned on the inner peripheral side of the support portion 47 is grounded. It is separated from the surface F.

  The bulging portion 45 is a film-like portion bulged and formed in a dome shape that gradually tapers from one side to the other side, and one side of the bulging portion 45 is connected to the support portion 47, and The other side of the bulging portion 45 is in contact with the lower surface side of the rigid plate 41. Since one side of the bulging portion 45 is supported by the support portion 47, the displacement of the bulging portion 45 relative to the tubular portion 44 can be suppressed.

  As shown in FIG. 7 (d), when a downward load W3 is applied to the rigid plate 41 from the bar stand 14 (see FIG. 1), an expansion is interposed between the rigid plate 41 and the floor surface F. The exit 45 is compressed.

  Since the rigid plate 41 is made of an iron plate having a predetermined rigidity, the rigid plate 41 can be prevented from being deformed by a load applied from the bar stand 14, and the load applied from the bar stand 14 bulges out. It can be prevented from being locally applied to a part of the portion 45. Therefore, the bass drum 1 can be stably installed on the second vibration isolation table 40.

  Since the bulging portion 45 is made of EPDM rubber having a hardness of 60 degrees, the bulging portion 45 can be prevented from being excessively compressed. That is, since the bulging portion 45 can be appropriately compressed with respect to the maximum load assumed at the time of performance, vibration and impact applied from the rigid plate 41 can be reduced by the bulging portion 45, and Plastic deformation of the bulging portion 43 can be suppressed.

  Further, since the bulging portion 45 is formed in a dome shape that tapers from one side to the other side, the EPDM has a hardness of 60 degrees so as to be properly compressed with respect to the maximum load assumed during performance. Even when the bulging portion 45 is made of rubber, the bulging portion 45 can be elastically deformed with a small load applied from the rigid plate 41 to the bulging portion 45. Therefore, the bulging portion 45 can reduce the vibration and impact generated due to a small load from being transmitted from the rigid plate 41 to the floor surface F.

  On the other hand, when a large load is applied to the bulging portion 45 from the rigid plate 41, it is easy to avoid the bulging portion 45 from being excessively compressed, and the bulging portion 45 is appropriately compressed. Can do. As a result, the bulging portion 45 can reduce the vibration and impact generated due to a large load from being transmitted from the rigid plate 41 to the floor surface F.

  Therefore, the second vibration isolating table 40 simplifies the structure of the main body portion 42 and suppresses the manufacturing cost, while the vibration and impact imparted to the bass drum 1 is transmitted to the floor surface F while the bulging portion 45. Can be reduced. As a result, noise generated from the floor surface F when playing a musical instrument can be reduced.

  Further, as the load applied to the bulging portion 45 increases, the contact area between the bulging portion 45 and the rigid plate 41 can be increased. Can be easily reduced.

  Further, since the covering portion 43 that covers the rigid plate 41 is slidably supported by the cylindrical portion 44, the axial direction of the cylindrical portion 44 (the vertical direction in FIG. 7D), that is, one of the bulging portions 45. The displacement of the covering portion 43 in the direction connecting the side and the other side is allowed, and the displacement of the cylindrical portion 44 in the direction perpendicular to the axial direction (the left-right direction and the paper surface vertical direction in FIG. 7D) is restricted. be able to.

  Accordingly, the rigid plate 41 can be prevented from being displaced in the front-rear and left-right directions (the left-right direction in FIG. 7D and the direction perpendicular to the paper surface) with respect to the bulging portion 45. It is possible to prevent the rod stand 14 placed on the rigid plate 41 from sliding down.

  Further, the lower surface side of the rigid plate 41 is supported on the other side of the bulging portion 45, and one side of the bulging portion 45 is disposed on the support portion 47 disposed so as to face the rigid plate 41 across the bulging portion 45. Since it is supported, the bulging portion 45 can be easily compressed by the downward load W3 applied to the bulging portion 45 from the rigid plate 41.

  Here, when a downward load W3 is applied to the bulging portion 45, a force to push down one side of the bulging portion 45 is applied, and accordingly, the outer peripheral side of the support portion 47 is It is drawn toward the inner circumference.

  Therefore, in the state before the load is applied to the bulging portion 45, when the inner peripheral side of the support portion 47 is in contact with the floor surface F, a downward load W3 is applied to the bulging portion 45. In addition, the outer peripheral side of the support part 47 is easily lifted from the floor surface F.

  On the other hand, the cylindrical portion 44 is formed in a tapered shape in which the lower surface side of the support portion 47 is inclined upward from the outer peripheral side toward the inner peripheral side, and a state before a downward load is applied to the bulging portion 45 Then, the inner peripheral side of the support portion 47 is separated from the floor surface F. Therefore, when the downward load W <b> 3 is applied to the bulging portion 45, it is possible to maintain a state in which the protruding portion 48 a located on the outer peripheral side of the support portion 47 is grounded to the floor surface F.

  Further, when a predetermined load or more is applied to the bulging portion 45, the protruding portion 48b located on the inner peripheral side of the support portion 47 can be grounded to the floor surface. Thereby, since both the protrusion part 48b located in the outer peripheral side and inner peripheral side of the support part 47 can be grounded to the floor surface F, the grip force of the bulging part 45 with respect to the floor surface F can be raised further. . Therefore, it can suppress that the 2nd vibration isolator 40 moves with respect to the floor surface F. FIG.

  On the other hand, when the load W3 applied to the rigid plate 41 is less than a predetermined value and the vibration or impact transmitted from the rigid plate 41 is small, the bulging portion 45, the floor surface F, and the ground contact area are reduced to reduce the vibration. And the impact transmitted to the floor surface F can be suppressed.

  Furthermore, since the projecting portions 48a and 48b are grounded to the floor surface F, the contact area with the floor surface F can be reduced as compared with the case where the entire lower surface of the support portion 47 is grounded to the floor surface F. Transmission of vibration and impact from the bar stand 14 to the floor surface F can be reduced.

  In the present embodiment, the main body portion 22 of the first vibration isolation table 20 and the main body portion 42 of the second vibration isolation table 40 are made of EPDM rubber, but the main body portions 22 and 42 are made of other elastic materials, For example, it may be composed of nitrile rubber, chlorobrene rubber, ethylene rubber, polyisobutylene, fluorine rubber, silicon rubber, urethane rubber, or the like.

  Further, in the present embodiment, the body portions 22 and 42 are made of EPDM rubber in which the hardness is set to 60 degrees, but the hardness of the body portions 22 and 42 is set to 50 degrees or more and 80 degrees or less. Is desirable.

  By setting the hardness of the main body portions 22 and 42 to 50 degrees or more, the bulging portions 25 and 45 are appropriately elastically deformed with respect to the maximum load assumed to be applied to the rigid plates 21 and 41. Can be made. That is, since the bulging portions 25 and 45 can be prevented from being excessively compressed, the bulging portions 25 and 45 reliably ensure that vibrations and impacts caused by a large load are transmitted to the floor surface F. Can be reduced.

  On the other hand, by setting the hardness of the main body portions 22 and 42 to 80 degrees or less, the bulging portions 25 and 45 can be easily elastically deformed by a small load. Therefore, it can be reliably reduced by the bulging portions 25 and 45 that vibrations and shocks generated due to a small load are transmitted to the floor surface F.

  Moreover, the thickness dimension of the bulging part 25 of the 1st vibration isolator 20 and the bulging part 45 of the 2nd vibration isolator 40 is 1/10 or more and 1/4 or less of the curvature radius of the bulging parts 25 and 45. It is desirable to set within the range.

  By setting the thickness dimension of the bulging portions 25, 45 to 1/10 or more of the radius of curvature of the bulging portions 25, 45, the maximum load assumed to be applied to the rigid plates 21, 41 Thus, the bulging portions 25 and 45 can be appropriately elastically deformed. On the other hand, by setting the thickness dimension of the bulging portions 25 and 45 to 1/4 or less of the radius of curvature of the bulging portions 25 and 45, the bulging portions 25 and 45 can be easily elastically deformed with a small load. be able to.

  In the present embodiment, the thickness dimensions of the bulging portion 25 of the first vibration isolation table 20 and the bulging portion 45 of the second vibration isolation table 40 are set to 3 mm, and the radii of curvature of the bulging portions 25 and 45 are set. Is set to 20 mm.

  Here, with reference to FIG. 8, the compression test performed with respect to the bulging part 25 of the 1st vibration isolator 20 is demonstrated. FIG. 8 is a graph showing the test results of the compression test. In this compression test, an iron plate is brought into contact with the other side of one bulging portion 25 of the first vibration isolation table 20, and a load is applied to the bulging portion 25 through the abutted iron plate. FIG. 8 is a graph showing how much the bulging portion 25 is compressed with respect to the load applied to the iron plate.

  As shown in FIG. 8, as a result of the compression test, the load necessary to compress the bulging portion 25 by 2 mm from the initial state (the state before the load is applied to the bulging portion 25) is about 10 N, and the bulging portion The load necessary for compressing 25 mm by 4 mm is approximately 35 N, the load necessary for compressing the bulging portion 25 by 6 mm is approximately 57 N, and the load necessary for compressing the bulging portion 25 by 8 mm is approximately 95 N. The load required to compress the portion 25 by 10 mm was about 142N.

  This test result shows that when the load applied per one bulging portion 25 is 0 or more and 40 N or less, the bulging portion 25 is proportionally displaced (compressed) between 1 mm and 5 mm, When the load applied per one bulging portion 25 exceeds 40 N, it indicates that the bulging portion 25 has a characteristic of deforming in a cubic function.

  That is, even if the load applied to the iron plate is small, the bulging portion 25 can be easily elastically deformed, while the bulging portion 25 becomes difficult to be compressed as the load applied to the iron plate increases. Is shown.

  This is because when the load applied to the iron plate is small, the peripheral length of the outer peripheral portion of the contact portion between the bulging portion 25 that mainly supports the load and the iron plate is also short. It is thought that it could be elastically deformed.

  On the other hand, as the load applied to the iron plate increases, the peripheral length of the outer peripheral portion of the contact portion between the bulging portion 25 and the iron plate becomes longer, so a large load is required to elastically deform the outer peripheral portion, As a result, it is considered that the bulging portion 25 can be prevented from being excessively compressed.

  Furthermore, the angle which the cross section perpendicular | vertical to the radial direction of the bulging part 25 and the iron plate becomes small becomes small as the bulging part 25 goes to the other side from one side. For this reason, it is considered that the portion closer to the other side of the bulging portion 25 can be easily elastically deformed with a smaller load with respect to the load applied from the other side of the bulging portion 25 to the one side.

  On the other hand, in the bulging portion 25, the angle formed by the cross section perpendicular to the radial direction of the bulging portion 25 and the iron plate increases from the other side toward the one side. Therefore, with respect to the load applied from the other side of the bulging portion 25 toward the one side, the load necessary to elastically deform the portion closer to the one side of the bulging portion 25 increases. It is considered that excessive swelling of the bulging portion 25 could be avoided.

  As described above, according to the first vibration isolation table 20 and the second vibration isolation table 40, vibrations and shocks generated due to various loads applied to the rigid plates 21 and 41 are caused by the floor surface. Transmission to F can be reduced by the bulging portions 25 and 45. As a result, the generation of noise from the floor surface F can be reduced.

  Next, a second embodiment will be described with reference to FIG. In the 2nd vibration isolator 40 in 1st Embodiment, although the case where the lower surface side of the rigid board 41 was supported by the other side of the bulging part 44 was demonstrated, in the 2nd vibration isolator 240 in 2nd Embodiment, The rigid plate 41 is supported on one side of the bulging portion. In addition, the same code | symbol is attached | subjected about the part same as above-described embodiment, and the description is abbreviate | omitted.

  Fig.9 (a) is a side view of the 2nd vibration isolator 240 in 2nd Embodiment, FIG.9 (b) shows the 2nd vibration isolator 240 in the IXb-IXb line | wire of Fig.9 (a). It is sectional drawing. 9A and 9B show a state in which the bar stand 214 is supported on the second vibration isolation table 240. FIG.

  As shown in FIGS. 9A and 9B, the second vibration isolation table 240 is an instrument for reducing vibration and impact transmitted from the bar stand 214 to the floor surface F, and the rigid plate 41. And a main body portion 242 that supports the rigid plate 41 in a state of floating from the floor surface F.

  The main body 242 is accommodated in the cylindrical portion 244 that covers the rigid plate 41, the cylindrical tubular portion 244 that slides and supports the rigid portion 41, and the rigid plate 41 and the covering portion. And a bulging portion 245 disposed below the H.243.

  The covering portion 243 covers the entire surface of the rigid plate 41, and a cylindrical grip portion 246 is erected on the upper surface of the covering portion 243.

  The grip portion 246 is a portion that grips the bar stand 214, and the outer peripheral surface of the grip portion 246 is slidably supported on the inner peripheral surface of the cylindrical portion 244, and the bar stand 214 is disposed on the inner peripheral side of the grip portion 246. It is formed so that it can be accommodated.

  Therefore, when the bar stand 214 is installed on the second vibration isolation table 240, the bar stand 214 is accommodated in the gripping portion 246, so that the positional deviation of the bar stand 214 with respect to the second vibration isolation table 240 can be prevented. The stick stand 214 can be prevented from sliding off the second vibration isolation table 240.

  The cylindrical portion 244 includes a support portion 247 that closes the lower end side and supports the other side of the bulging portion 245.

  The bulging portion 245 is a film-like portion bulged and formed in a dome shape that tapers from one side to the other side, and one side of the bulging portion 245 is connected to the lower surface side of the covering portion 243. At the same time, the other side of the bulging portion 245 is supported by the support portion 247.

  When a downward load is applied from the bar stand 214 to the rigid plate 41, the bulging portion 245 interposed between the rigid plate 41 and the support portion 247 is compressed.

  At this time, since the grip portion 246 that accommodates the bar stand 214 and the covering portion 243 that covers the rigid plate 41 are slidably supported by the cylindrical portion 244, the axial direction of the cylindrical portion 244 (FIG. 9D). (Vertical direction), that is, perpendicular to the axial direction of the cylindrical portion 244 while permitting displacement of the rigid plate 41 and the covering portion 243 in a direction along the direction connecting one side and the other side of the bulging portion 245. The displacement in the direction (FIG. 9 (d) left-right direction and the direction perpendicular to the paper surface) can be restricted.

  Accordingly, the rigid plate 41 and the rod stand 14 can be restricted from being displaced in the front-rear and left-right directions (FIG. 9 (d) left-right direction and the direction perpendicular to the paper surface) with respect to the bulging portion 245. 41 can be prevented from being displaced, and the stick stand 214 placed on the rigid plate 41 can be prevented from sliding down.

  Further, the lower surface of the rigid plate 41 is supported on one side of the bulging portion 245, and the other side of the bulging portion 245 is disposed on the support portion 247 disposed to face the rigid plate 41 with the bulging portion 245 interposed therebetween. Since it is supported, the bulging portion 245 can be easily compressed and deformed. As a result, vibration and impact transmitted from the rigid plate 41 to the bulging portion 245 can be reliably reduced.

  Further, since the bulging portion 245 is formed in a dome shape that tapers from one side to the other side, the EPDM has a hardness of 60 degrees so as to be appropriately compressed with respect to the maximum load assumed during performance. Even when the bulging portion 245 is made of rubber, the bulging portion 245 can be elastically deformed with a small load applied from the rigid plate 41 to the bulging portion 245. Therefore, the bulging portion 245 can reduce the vibration and impact generated due to a small load from being transmitted from the rigid plate 41 to the floor surface F.

  On the other hand, when a large load is applied from the rigid plate 41 to the bulging portion 245, it is easy to avoid the bulging portion 245 from being excessively compressed, and the bulging portion 245 is appropriately compressed. Can do. As a result, the bulging portion 245 can reduce the vibration and impact generated due to a large load from being transmitted from the rigid plate 41 to the floor surface F.

  In this way, by forming the bulging portion 245 into a hollow dome shape that tapers from one side to the other side, it is possible to reduce vibrations and impacts caused by loads of various sizes. Since it can do, it can suppress that a vibration and an impact are transmitted to the floor F (refer FIG.7 (b)), As a result, generation | occurrence | production of the noise from the floor F can be reduced.

  Next, a third embodiment will be described with reference to FIG. In the first embodiment, the case where the thickness dimension of the bulging portion 25 is constant from one side to the other side has been described, but in the third embodiment, the thickness dimension of the bulging portion 325 is from one side. It becomes gradually larger toward the other side. In addition, the same code | symbol is attached | subjected about the part same as each above-mentioned embodiment, and the description is abbreviate | omitted.

  FIG. 10A is a partially enlarged bottom view of the main body 320 in the third embodiment, and FIG. 10B is a cross-sectional view of the main body 320 taken along line Xb-Xb in FIG. .

  As shown in FIGS. 10A and 10B, the bulging portion 325 is formed in a dome shape that gradually tapers from one side to the other side (from the upper side to the lower side in FIG. 10B). One side of the bulging portion 325 is connected to the covering portion 323, and the other side of the bulging portion 325 is formed on the floor surface F (see FIG. 1) so that it can be grounded.

  Moreover, since the other side of the bulging portion 325 is chamfered, the bulging portion 325 can be stably grounded to the floor surface F (see FIG. 1).

  Further, the bulging portion 325 gradually decreases in thickness as it goes from one side to the other side. Thereby, the displacement characteristic of the bulging part 325 can be adjusted arbitrarily.

  Next, a fourth embodiment will be described with reference to FIG. In the first embodiment, the bulging portion 25 is formed in a dome shape that gradually tapers from one side to the other side, whereas in the fourth embodiment, the bulging portion 425 is formed from one side. It is formed in a substantially rhombus shape in a bottom view that gradually tapers as it goes to the other side. In addition, the same code | symbol is attached | subjected about the part same as each above-mentioned embodiment, and the description is abbreviate | omitted.

  FIG. 11A is a bottom view of the main body 420 in the fourth embodiment, FIG. 11B is a partially enlarged bottom view of the main body 420, and FIG. 11C is FIG. It is sectional drawing of the main-body part 420 in the XIc-XIc line | wire of b), FIG.11 (d) is sectional drawing of the main-body part 420 in the XId-XId line | wire of FIG.11 (d). In addition, in FIG.11 (c) and FIG.11 (d), in order to simplify drawing and to make description easy to understand, the cross-sectional shape of the bulging part 425 is typically shown.

  As shown in FIGS. 11A and 11B, the main body 422 has a bulging portion 425 that gradually tapers from one side to the other side (from the upper side to the lower side in FIG. 11B). The cover portion 423 is integrally bulged.

  The bulging portion 425 is formed in a substantially rhombus shape when viewed from the other side, and the length of one diagonal is set longer than the length of the other diagonal. Further, since the other side of the bulging portion 425 is chamfered, the bulging portion 425 can be stably grounded with respect to the floor surface F (see FIG. 1).

  The body portion 422 is provided with eight bulging portions 425, and four bulging portions 425 disposed at equal intervals along the longitudinal direction of the covering portion 423 (FIG. 11A left-right direction). Of the bulging portion 425 adjacent to each other in the longitudinal direction and the width direction of the covering portion 423, which are juxtaposed in the peripheral portion at one end portion and the other end portion in the width direction (the vertical direction in FIG. 11A) of the covering portion 423. One diagonal line is arranged in a different direction.

  As shown in FIGS. 11 (c) and 11 (d), the bulging portion 425 is linearly formed from one side to the other side, and the one side and the other side of the bulging portion 425 are connected to each other. The angle formed by the bulging portion 425 connected along one diagonal line and the floor surface F (see FIG. 1) is the bulge connecting one side and the other side of the bulging portion 425 along the other diagonal line. It is smaller than the angle formed by the protruding portion 425 and the floor surface F.

  Therefore, when the other surface side of the bulging portion 425 is grounded to the floor surface F (see FIG. 1), the grounding area in the direction along one diagonal is more than the grounding area in the direction along the other diagonal. Widely secured. Therefore, when a load is applied to the bulging portion 425 along one diagonal line, the gripping force of the bulging portion 425 with respect to the floor surface F can be improved.

  Further, in the main body 420, the bulging portion 425 adjacent in the longitudinal direction and the width direction of the covering portion 423 is disposed so that one diagonal line thereof is directed in a different direction. It is possible to increase the grip force in the front-rear and left-right directions of 425 (the up-down direction and the left-right direction in FIG. 11A).

  Since the bulging portion 425 tapers from one side to the other side, the contact between the floor surface F and the bulging portion 425 increases as the load applied downward to the bulging portion 425 increases. The area can be increased.

  Therefore, when the load applied to the bulging portion 425 is small, the circumferential length of the outer peripheral portion of the ground contact portion between the bulging portion 425 and the floor surface F that mainly supports the load is short, so The protruding portion 425 can be elastically deformed.

  On the other hand, as the load applied to the bulging portion 425 increases, the circumferential length of the outer peripheral portion of the ground contact portion between the bulging portion 425 and the floor surface F becomes longer. A load is required, and as a result, it is possible to avoid the bulging portion 425 from being excessively compressed.

  Accordingly, since the bulging portion 425 can be easily elastically deformed with a small load, the bulging portion 425 can reduce the vibration and impact generated due to the small load from being transmitted to the floor surface F. it can. Moreover, when a big load is given with respect to the bulging part 425, it can be easy to avoid that the bulging part 425 is compressed too much, and the bulging part 425 can be compressed appropriately.

  Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. Can be easily guessed.

  For example, in each of the above-described embodiments, the case where the rigid plates 21 and 41 are made of an iron plate having a predetermined rigidity has been described. However, the present invention is not necessarily limited thereto, and the rigid plate is a metal material different from the iron plate, Or you may be comprised from plate-shaped members other than the metal material which has predetermined rigidity, for example, wood, a resin material, etc.

  By configuring the rigid plate from a metal material, the thickness of the rigid plate can be set small while ensuring the rigidity of the rigid plate. Therefore, the floor surface F of the kick pedal 2 placed on the rigid plate can be set. It is possible to prevent the height position from being too high.

  In the first to third embodiments, the bulging portions 25, 45, 245, 325 are tapered in a dome shape from one side to the other side, and in the fourth embodiment, the bulging portion 425 is provided. Although the case where it is formed in a substantially rhombus shape in a top view that tapers from one side to the other side has been described, it is not necessarily limited to this, and the bulging portion tapers from at least one side to the other side. The shape of the bulging portion may be other shapes, for example, a polygonal shape in a top view and an elliptical shape in a top view.

  In each of the above embodiments, the plurality of bulging portions 25, 325, 425 of the first vibration isolation tables 20, 320, 420 are peripheral portions at one end portion and the other end portion in the width direction of the covering portions 23, 323, 423. However, the present invention is not necessarily limited thereto, and the bulging portions 25, 325, 425 may be placed at other positions of the covering portions 23, 323, 423, such as the covering portions 23, 323, respectively. You may arrange | position in the center part in the width direction of 423. FIG.

  In each of the above-described embodiments, the case where the main body portions 22, 322, and 422 of the first vibration isolation tables 20, 320, and 420 are divided into two along the width direction at the central portion in the longitudinal direction has been described. It is not restricted to this, The main-body part may not be divided | segmented and the main-body part may be divided | segmented into three or more. Further, the main body may be divided into two or more along the longitudinal direction.

  In addition, by dividing the main body portions 22, 322, 422 into two or more, each divided main body portion 22, 322, 422 can be reduced in size and handled easily.

  Further, when the main body portions 22, 322, 422 are divided into two or more, the main body portion 20 with respect to the rigid plate whose dimension in either the longitudinal direction or the width direction is set larger than that of the rigid plate 21. , 320, 420 can be mounted. Further, when the main body portions 22, 322, 422 are divided into three or more along the same direction, a part of the divided main body portions 22, 322, 422 is omitted from the rigid plate 21. Also, the main body portions 20, 320, and 420 can be attached to a rigid plate having a small dimension in either the longitudinal direction or the width direction. Therefore, the versatility of the main body portions 22, 322, and 422 can be improved.

  In each of the above embodiments, the case where the rigid plate 21 of the first vibration isolation table 20, 320, 420 is formed in a rectangular plate shape is described. However, the present invention is not necessarily limited to this, and the rigid plate may be formed in other shapes. You may form in. For example, by forming a rigid plate shape in a substantially trapezoidal shape in top view that approximates the base portion 2a of the kick pedal 2, it is possible to save the space of the first vibration isolation table.

  In the first embodiment, the protrusions 28 of the first vibration isolation table 20 and the protrusions 48 a and 48 b of the second vibration isolation table 40 are formed concentrically as viewed from the other side of the bulging portions 25 and 45. Although the case has been described, the present invention is not necessarily limited to this, and the shape of the projecting portion is a shape other than the concentric shape, for example, a radial shape or a spiral shape when viewed from the other side of the bulging portions 25 and 45. May be.

  In the third embodiment, a case has been described in which the thickness dimension of the bulging portion 325 gradually increases from one side to the other side, but the present invention is not necessarily limited to this, and the thickness of the bulging portion 325 is not necessarily limited thereto. The dimension may be gradually reduced from one side to the other side. Thereby, the displacement characteristic of a bulging part can be set arbitrarily.

1 Bass drum (vibrating body)
2 Kick pedal (vibrating body)
2a Base (part of vibrating body)
12 Support stand (part of vibrating body)
13 Plate stand (part of vibrating body)
14,214 Bar stand (part of vibrating body)
20, 320, 420 First anti-vibration table (anti-vibration table)
21, 41 Rigid plate 22, 42, 242, 322, 422 Main body part 23, 43, 243, 323, 423 Covering part 24 Standing part 24a Overhang part (part of standing part)
25, 45, 245, 325, 425 Swelling portion 26 Groove portion 27 Communication holes 28, 48a, 48b Protruding portion 43a1 Locking portion 43a2 Protruding surface portion 44,244 Cylindrical portion 46 Restricting portion 246 Holding portion 47, 247 Supporting portion F Floor surface

Claims (19)

In a vibration isolator that suppresses vibration and shock generated in the vibrating body from being transmitted to the floor surface by being interposed between the vibrating body that vibrates with the performance of the musical instrument and the floor surface,
A rigid plate composed of a plate-like member having a predetermined rigidity;
A main body that supports the rigid plate in a state of floating from the floor surface,
The main body portion is composed of a rubber-like elastic body having higher elasticity than the rigid plate, and includes a plurality of film-like bulging portions formed to bulge out from one side to the other side, An anti-vibration table characterized in that the lower surface side of the rigid plate is supported on one side or the other side of the plurality of bulging portions.   2. The vibration isolator according to claim 1, wherein the rigid plate is made of a metal material.   The vibration isolator according to claim 1 or 2, wherein the bulging portions are disposed at least at four corners of the rigid plate.   4. The vibration isolator according to claim 3, wherein the number of the bulging portions is 6 or more and 16 or less.   The vibration isolator according to any one of claims 1 to 4, wherein the bulging portion is made of a rubber-like elastic body having a hardness of 50 degrees or more and 80 degrees or less.   6. The vibration isolator according to claim 1, wherein an allowable maximum weight of the vibrating body that can be placed on the rigid plate is set to 4 kg or less per one bulging portion. .   The bulging portion has a characteristic that it is proportionally displaced when the applied load is equal to or less than a predetermined value, and is displaced N-orderly when the applied load exceeds the predetermined value. The vibration isolator according to any one of claims 1 to 6, wherein the anti-vibration table is provided.   The vibration isolator according to claim 7, wherein the bulging portion is formed in a dome shape.   9. The vibration isolator according to claim 8, wherein a thickness dimension of the bulging portion is set within a range of 1/10 to 1/4 of a curvature radius of the bulging portion.   The vibration isolator according to claim 8 or 9, wherein a thickness dimension of the bulging portion changes from one side to the other side.   The said main-body part is provided with the plate-shaped coating | coated part which coat | covers the lower surface side of the said rigid board, The said several bulging part is integrally bulged and formed in the coating | coated part. To 10. The vibration isolator according to any one of 10 to 10.   The body portion includes a standing portion that is provided on one surface side of the covering portion that faces the lower surface of the rigid plate and that extends along a peripheral edge of the covering portion, and the rigid portion is provided on the standing portion. The vibration isolator according to claim 11, wherein the plate is surrounded.   The vibration isolator according to claim 12, wherein the main body is divided into two or more.   The vibration isolator according to any one of claims 11 to 13, wherein in the main body, one side of the plurality of bulging portions is connected to the covering portion.   The main body is recessed on one surface side of the covering portion facing the lower surface of the rigid plate and communicated with the bulging portion, and is drilled from the groove portion toward the other surface of the covering portion. The anti-vibration table according to claim 14, further comprising: a communicating hole provided, wherein the inside and the outside of the bulging portion communicate with each other via the groove and the communicating hole.   The vibration isolator according to claim 14 or 15, wherein the bulging portion includes a protruding portion protruding from an outer surface thereof.   The anti-vibration table according to claim 16, wherein the protruding portion is formed concentrically as viewed from the other side of the bulging portion.   The vibration isolator according to any one of claims 1 to 17, wherein the rigid plate is formed in a rectangular shape in a top view.   The vibration isolator according to any one of claims 1 to 17, wherein the rigid plate is formed in a trapezoidal shape when viewed from above.

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