JP7403198B1 - Instrument or speaker support - Google Patents

Abstract

The present invention provides a support that improves the sound quality of a musical instrument or a speaker. A support 2 is disposed between a floor surface 4 and a piano 1 to support the piano 1. The support 2 includes a first support part 3 supported on a floor surface 4 and a ball unit 5 arranged on the first support part 3. The ball unit 5 includes a plurality of balls 51 and a holder 52 that holds the plurality of balls in a circumferentially arranged state. The first support portion 3 is provided with a first rolling surface 56 on which the balls 51 of the ball unit 5 roll. Shape it so that it can roll. [Selection diagram] Figure 1

Description

The present invention relates to a support for supporting a musical instrument or a speaker.

When instruments such as pianos, organs, harpsichords, drum sets, kotos, guitars, and speakers are placed directly on the floor or stand, the freedom of vibration generated by the instruments and speakers is inhibited, so the sound waves generated by the instruments and speakers are There is a problem in that it causes distortion in vibration.

For example, Patent Document 1 below (for example, FIG. 6) discloses an audio insulator in which a ball bearing is installed between the upper end surface of a spring coil and an upper sleeve to reduce the vibration damping effect acting on the upper sleeve. It is described that this improves acoustic characteristics.

Japanese Patent Application Publication No. 2014-209398

In the configuration of Patent Document 1, the balls of the ball bearing roll along circumferential annular grooves (raceway grooves) provided in a pair of bearing rings, respectively. Therefore, the balls can roll in the circumferential direction of the bearing, but cannot roll in the radial direction of the bearing. In this case, the effect of damping vibrations in the radial direction of the bearing is poor, so there is a limit to the effect of improving sound quality characteristics.

Therefore, an object of the present invention is to provide a support that can improve the sound quality of a musical instrument or a speaker.

In order to solve the above problems, the present invention provides a support that is placed between a floor and a musical instrument or a speaker serving as a sound source, and that supports the musical instrument or the speaker, the support being arranged on the floor. The device includes a first supporting portion to be supported and a ball unit disposed on the first supporting portion, and the ball unit holds a plurality of balls and the plurality of balls arranged in a circumferential direction. a cage, the first support section is provided with a first rolling surface on which the balls of the ball unit roll, and the first rolling surface is moved in an arbitrary direction along the first rolling surface. The ball is characterized by a shape that allows it to roll.

With this configuration, when a musical instrument or a speaker is placed on the ball unit, the musical instrument or the like can be moved with respect to the floor in any direction along the first rolling surface. Therefore, even when a musical instrument or the like generates sonic vibration, the vibration (particularly the vibration in the direction along the first rolling surface) is not restrained by the support. Therefore, the original sound wave vibrations produced by musical instruments, etc. can be diffused into the surroundings, thereby making it possible to improve the sound quality of musical instruments, etc.

The first rolling surface may be formed into a concave curved surface having a radius of curvature of a radial cross section larger than a radius of the ball.

In this way, by making the first rolling surface a concave curved surface in which the radius of curvature of the radial cross section is larger than the radius of the ball, the position of the ball unit with respect to the first rolling surface is determined autonomously. Therefore, it is possible to prevent the ball unit from falling off. In order to obtain such an effect, it is preferable that the radius of curvature of the radial cross section of the first rolling surface is 1.5 times or more the radius of the ball.

The first rolling surface may also be formed into a flat surface.

The first support portion may be provided with a locking portion that faces the retainer of the ball unit in the radial direction with a radial gap therebetween, so that the locking portion can be engaged with the retainer in the radial direction. can. This can prevent the ball unit from falling off.

The above-described support further includes a second support part disposed closer to the sound source than the ball unit, and the second support part is provided with a second rolling surface on which the ball rolls, and the second support part is provided with a second rolling surface on which the ball rolls, and The second rolling surface may be shaped so that the ball can roll in any direction along the second rolling surface.

In this case, the second rolling surface can be formed into a concave curved surface having a radius of curvature of a radial cross section larger than the radius of the ball. It is preferable that the radius of curvature of the radial cross section of the second rolling surface is 1.5 times or more the radius of the ball.

Moreover, the second rolling surface can be formed into a flat surface.

The second support portion is provided with a locking portion that faces the retainer of the ball unit in the radial direction through a radial gap, and the locking portion is capable of engaging with the retainer in the radial direction. , it is possible to prevent the ball unit from falling off.

As described above, according to the present invention, the sound quality of a musical instrument or a speaker can be improved.

FIG. 2 is a sectional view showing a state in which the legs of the piano are supported by the support device according to the first embodiment. FIG. 2 is a plan view of the support shown in FIG. 1; FIG. 2 is a perspective view of a support member that constitutes the support shown in FIG. 1. FIG. FIG. 3 is a plan view of the ball unit. 5 is a sectional view taken along line AA in FIG. 4. FIG. FIG. 3 is a perspective view of a support according to a second embodiment. 7 is an enlarged cross-sectional view showing a state in which the legs of the piano are supported by the support shown in FIG. 6. FIG. It is a perspective view of the support tool concerning a third embodiment. FIG. 9 is a side view of the support shown in FIG. 8; FIG. 9 is a sectional view of the support shown in FIG. 8; FIG. 7 is a sectional view of a support according to a fourth embodiment. It is a sectional view of the support concerning a fifth embodiment. It is a sectional view of the support concerning a sixth embodiment. FIG. 14 is a plan view of the support shown in FIG. 13; FIG. 14 is a plan view schematically showing how the support shown in FIG. 13 is used. 14 is an enlarged sectional view showing the ball unit of the support shown in FIG. 13. FIG. It is a sectional view of the support concerning a seventh embodiment. It is a perspective view of the load transmission member used in 7th embodiment. It is a sectional view of the support concerning an eighth embodiment.

Embodiments of the present invention will be described below based on FIGS. 1 to 19.

The support 2 according to the present invention is disposed between a floor surface 4 and a musical instrument or speaker serving as a sound source 1, and is used to support the musical instrument or speaker. In the following, the support 2 that supports a piano (for example, the legs 6 of a grand piano) as a musical instrument will be described as an example.

[First embodiment]
As shown in FIGS. 1 and 2, the support 2 of the first embodiment is arranged between the floor surface 4 and the legs 6 of the grand piano 1. The floor surface 4 is a surface that receives the load of the piano 1, and includes a wide range of floor surfaces provided on buildings, stages, stands, and the like.

The support 2 according to the first embodiment includes a first support part 3 and a ball unit 5 arranged on the first support part 3.

The first support part 3 of this embodiment has a support member 3a and a receiving member 3b that supports the support member 3a. It is also possible to omit the receiving member 3b and place the supporting member 3a directly on the floor surface 4.

The support member 3a integrally includes a first leg portion 31, a second leg portion 32, and a bridge portion 33 that connects one end (upper end) of the first and second leg portions 31 and 32. Each of the legs 31 and 32 has an arc-shaped cross section, and is arranged so that the vertices of the two convex arcs abut against each other in the horizontal direction. The other end of the first leg portion 31 is a free end extending directly below the center of curvature of the arc to a position rising upward, and the other end of the second leg portion 32 is a free end extending horizontally from the arc. to do. In FIG. 1, the first leg portion 31 and the second leg portion 32 are brought into contact with each other and fixed by welding or the like, but they may be placed apart without being fixed.

In this embodiment, as shown in FIG. 3, two sets of a first leg part 31 and a second leg part 32 are arranged in the direction in which an axle 72 (described later) extends as the support member 3a, and both are connected to a connecting part 34, An example having a structure in which numeral 35 is integrally connected is illustrated. In this case, the two first leg parts 31 are connected by one connecting part 34, and the two second leg parts 32 are connected by the other connecting part 35. The bridge portion 33 is formed to straddle the upper ends of the two first leg portions 31 and to straddle the upper ends of the two second leg portions 32 . The upper surface 33a of the bridge portion 33 is formed into a flat surface extending in the horizontal direction.

The support member 3a described above is integrally formed of a metal material such as steel. The supporting member 3a can be manufactured by any method, for example, by punching a metal plate by press working and then bending it, or by carving it out of a metal material. When the piano 1 is placed on the support 2, the support member 3a is elastically deformed by the weight of the piano 1.

As shown in FIGS. 1 and 2, casters 7 are attached to the lower ends of the legs 6 of the piano 1. The caster 7 includes a wheel 71, an axle 72, a pair of side plates 73 (see FIG. 2) that rotatably supports both ends of the axle 72 via bearings (not shown), and a base portion 74 that integrally supports the side plates 73. Equipped with The side plate 73 and the base portion 74 may be formed integrally, or alternatively, they may be formed as separate members and connected by appropriate means.

A shaft 75 extending along the longitudinal direction of the leg 6 is fixed to the upper surface of the base portion 74 . The shaft 75 is rotatably inserted into a hole provided in the leg 6. Thereby, the entire caster 7 including the base portion 74 is rotatable about the axis O1 along the longitudinal direction of the leg 6. The rotation center O1 of the caster 7 and the rotation center O2 of the wheel 71 are at horizontally shifted positions. The lower surface 74a of the base portion 74 is formed into a flat surface extending in the horizontal direction.

In a large grand piano, a braking device may be provided on the casters 7 in order to fix the position of the piano during performance. FIG. 1 illustrates a caster 7 with such a braking device 8. The braking device 8 has a braking portion 81 in the shape of an end ring extending from the base portion 74 near the axial center of the axle 72 . The brake part 81 has a cylindrical shape with a part of its circumferential area cut out along the axle direction, and a slight gap is provided between the inner circumference of the brake part 81 and the inner peripheral surface of the brake part 81. The axle 72 is inserted. The brake part 81 has standing parts 82 and 83 that stand up in the radial direction of the brake part 81 at both ends in the circumferential direction. In this embodiment, one of the two upright parts 82 and 83 is formed integrally with the base part 74. The upright portion 82 and the base portion 74 may be separate members and may be coupled together by appropriate means.

A tightening member 84 having a threaded shaft is screwed into the upright portions 82 and 83 of the brake portion 81 . By tightening this tightening member 84 and bringing the upright portions 82 and 83 closer to each other, the braking portion 81 is reduced in diameter and comes into pressure contact with the axle 72, and a braking force is applied to the axle 72. By loosening the tightening member 84, a gap is formed between the axle 72 and the brake part 81, and the wheel 71 of the caster 7 can rotate about the center O2 as the rotation axis.

One supporter 2 is placed at the bottom of each of a plurality of (usually three) legs 6 provided on the grand piano 1. The piano 1 is supported by the plurality of supports 2 by arranging each leg 6 including the caster 7 and the braking device 8 on the support member 3a of each support 2 via the ball unit 5 described below. At this time, the wheels 71 of the caster 7 are accommodated on the inner diameter side of the first leg part 31 of the support member 3a while maintaining a non-contact state with the first leg part 31. Note that the caster 7 of this embodiment has a structure in which two wheels 71 are fixed to one axle 72. As shown in FIG. 3, two wheels 71 are housed in each of the two first legs 31, one each.

4 and 5 show the ball unit 5 used in the support 2 of this embodiment. 4 is a plan view of the ball unit 5, and FIG. 5 is a sectional view taken along line AA in FIG. As shown in FIGS. 4 and 5. The ball unit 5 includes balls 51 arranged at a plurality of locations in the circumferential direction, and a retainer 52 that holds the plurality of balls 51 arranged in the circumferential direction at equal intervals.

As shown in FIG. 3, the ball units 5 are placed on the bridge section 33 at two locations spaced apart in the direction extending to the axle 72. Note that the number of ball units 3 disposed on the support member 3a is arbitrary, and one ball unit 5 may be disposed on the bridge section 33, or three or more ball units 5 may be disposed on the bridge section 33. . The number of ball units 5 disposed on the support member 3a is determined depending on the magnitude of the load applied to the support 2.

Pockets 53 for accommodating the balls 51 are formed at a plurality of locations (preferably five or more locations) in the circumferential direction of the retainer 52 . The retainer 52 of this embodiment is formed of a metal plate thinner than the diameter of the balls 51. Therefore, when the retainer 52 is viewed from the horizontal direction, a portion of the surface of the balls 51 protrudes from both sides of the retainer 52 in the axial direction. The retainer 52 is provided with a center hole 54 at its center that penetrates in the thickness direction of the metal plate. The shape of the retainer 52 is not limited to a plate shape, and any shape can be adopted as long as both sides of the ball 51 in the diametrical direction protrude outside the retainer 52.

Ball holding portions 55 that protrude toward the balls 51 are provided at the upper and lower ends of the inner surface of the pocket 53 formed in the retainer 52 . The ball holding portion 55 prevents the ball 51 from falling off in the vertical direction. Therefore, when the ball unit 5 is placed between the rolling surfaces 56 and 57 (see FIG. 1) facing each other in the vertical direction, the cage 52 is kept out of contact with the rolling surfaces 56 and 57, and the balls 51 can be rolled on the rolling surfaces 56 and 57. The ball holding portion 55 can be formed, for example, by caulking the upper and lower ends of the inner surface of the pocket 53.

By arranging the ball unit 5 between the leg 6 of the piano 1 and the first support part 3 in this way, each ball 51 of the ball unit 5 can contact the first rolling surface 56 provided on the support member 3a, The second rolling surface 57 provided on the piano leg 6 can integrally roll in any direction along each rolling surface 56, 57. That is, the balls 51 can roll not only in the circumferential direction of the ball unit 5 but also in the radial direction of the ball unit 5. As each ball 51 rolls, the retainer 52 becomes movable in any horizontal direction. In the first embodiment, the upper surface 33a of the bridge portion 33 of the support member 3a is the lower first rolling surface 56, and the lower surface 74a of the base portion 74 is the upper second rolling surface 57. There is. Both rolling surfaces 56 and 57 are formed into flat surfaces extending in the horizontal direction. In the following description, the member provided with the first rolling surface 56 will be referred to as a "first raceway member", and the member provided with the second rolling surface 57 will be referred to as a "second raceway member".

In this way, since the ball unit 5 is arranged between the leg 6 of the piano 1 and the first support part 3, and the balls 51 can roll in any direction along the rolling surfaces 56, 57, it is possible to play. When the piano 1 vibrates and the legs 6 further vibrate, the balls 51 roll slightly on the rolling surfaces 56 and 57 accordingly. Therefore, the vibration of the leg 6 is not restrained by the support 2. Therefore, the original sound wave vibrations generated by the piano 1 can be diffused to the surroundings, and the sound quality of the piano 1 can be improved.

In particular, the support 2 of this embodiment allows the balls 51 to roll in any direction along the rolling surfaces 56 and 57, including not only the circumferential direction of the cage 52 but also the radial direction of the cage 52. Therefore, the vibration components generated in the piano 1, especially the vibration components in the horizontal direction, are not restrained. Therefore, the effect of improving the sound quality of the piano 1 becomes remarkable.

It is expected that the same effect will be achieved even if only one ball is interposed between the leg 6 and the support part 3 of the piano 1, but in reality, even if only one ball is interposed, the sound quality improvement effect is not achieved. It becomes insufficient. This is because if only one ball is interposed, the surface pressure acting on the ball becomes extremely large, which inhibits the minute rolling of the ball due to the vibration of the legs 6, and as a result, the ball restrains the vibration of the legs 6. This is due to the fact that it results in On the other hand, if a plurality of (preferably 5 or more) balls 51 are used as the legs 6 and the members are interposed, the surface pressure acting on each ball 51 will be lowered due to the distribution of the load. This is thought to be due to smoother rolling.

[Second embodiment]
Next, a second embodiment according to the present invention will be shown based on FIGS. 6 and 7. FIG. 6 is a perspective view of the support 2 according to the second embodiment, and FIG. 7 is an enlarged sectional view showing the support 2 of the second embodiment supporting the legs 6 of the piano 1 (see FIG. 1). be.

As shown in FIG. 6, the first support section 3 of the second embodiment includes the support member 3a described in the first embodiment and a pedestal 3c arranged on the support member 3a. A ball unit 5 is arranged on the pedestal 3c. The pedestal 3c is fixed or placed on the upper surface 33a of the bridge portion 33 of the support member 3a, as shown in FIG. In this case, the upper surface of the pedestal 3c becomes the first rolling surface 56, and the pedestal 3c becomes the first track member.

The pedestal 3c is provided with a locking portion 9 that faces the retainer 52 of the ball unit 5 in the radial direction with a radial gap α therebetween. The locking portion 9 engages in the radial direction with the retainer 52 of the ball unit 5 which has moved in the horizontal direction as the balls 51 roll. In this embodiment, a peripheral wall 3c1 provided over the entire circumference of the edge of the upper surface of the pedestal 10 functions as the locking portion 9.

Further, as shown in FIG. 7, the second raceway member (base portion 74) provided with the second rolling surface 57 is also provided with a locking portion 9 that faces the retainer 52 in the radial direction with a radial clearance β therebetween. It will be done. In this embodiment, a protrusion 76 provided on the lower surface 74a of the base portion 74 functions as the locking portion 9. The protrusion 76 is inserted into the center hole 54 of the retainer 52. The protruding portion 76 (locking portion 9) engages in the radial direction with the retainer 52 of the ball unit 5 that has moved in the horizontal direction as the balls 51 roll.

By providing the locking portions 9 on both the first raceway member (pedestal 3c) provided with the first rolling surface 56 and the second raceway member (base portion 74) provided with the second rolling surface 57 in this way, It is possible to prevent the ball unit 5 from falling out of the space between the support member 3a and the base portion 74, and it is possible to stably support a musical instrument or the like. Further, by providing the radial gap α and the radial gap β, it is possible to allow the ball unit 5 to move in the radial direction due to the rolling of the balls 51, and the vibration of the legs 6 is restrained by the ball unit 5. The situation can be avoided. The radial gap α and the radial gap β may have the same size or different sizes, but both are set to a width larger than the amplitude when the leg 6 vibrates.

In this support 2, the upper surface of the pedestal 10 serves as a first rolling surface 56 on which the balls 51 of the ball unit 5 roll, and the lower surface 74a of the base portion 74 serves as a second rolling surface 57 on which the balls 51 similarly roll. Become. While the piano 1 is being played, the balls 51 of the ball unit 5 roll slightly in response to vibrations transmitted from the legs 6. Therefore, similarly to the first embodiment, a reduction in the degree of freedom of vibration in the piano 1 can be avoided, and the sound quality can be improved.

In the second embodiment, the protruding portion 76 (locking portion 9) is provided on the second raceway member (base portion 74) provided with the second rolling surface 57; A protrusion 76 can also be provided on the member (pedestal 3c) (see FIG. 10). In this case, it is preferable to provide the base portion 74 with a locking portion 9 corresponding to the peripheral wall 3c1 of the pedestal 3c. Further, when the pedestal 3c is not used as in the first embodiment shown in FIGS. 1 to 3, a protrusion 76 may be provided on the upper surface of the bridge portion 33 that becomes the first rolling surface 56.

[Third embodiment]
A third embodiment of the present invention will be described based on FIGS. 8 to 10. FIG. 8 is a perspective view of the support 102 according to the third embodiment, FIG. 9 is a side view of the support 102 that supports the legs 6 of the piano 1, and FIG. 10 is a cross-sectional view of the support 102. It is a diagram.

As shown in FIGS. 8 and 9, the support 12 of the third embodiment has a first support part 3 supported on the floor surface 4, and a space between the first support part 3 and the legs 6 of the piano 1. A ball unit 5 is provided.

The first support part 3 includes a movable member 3d whose inclination angle with respect to the horizontal direction can be changed, a base member 3e disposed on the floor 4, and a bolt or the like that fixes one end of the movable member 3d to the base member 3e. It includes a fastening member 3f, a spacer 3g disposed between the movable member 3d and the base member 3e, and an adjusting means 3h for adjusting the support position of the leg 6 on the movable member 3d.

An insertion hole 3d1 for inserting the fastening member 3f is formed at one end of the movable member 3d, and a curved surface for adjusting the inclination angle of the movable member 3d with respect to the floor surface 4 is formed on the lower surface of the other end of the movable member 3d. An angle adjustment portion 3d2 having a shape is formed. As shown in FIG. 10, the angle adjustment portion 3d2 has the same outline in the direction perpendicular to the paper surface of FIG. A stopper portion 3d3 projecting upward is provided at the other end of the movable member 3d. The stopper portion 3d3 has a function of preventing the legs 6 of the piano 1 from falling off the movable member 3d.

A female thread 3e1 into which the fastening member 3f is screwed is formed at one end of the base member 3e. A contact portion 3e2 that contacts the angle adjustment portion 3d2 of the movable member 3d is formed on the other end side of the base member 3e. The base member 3e is provided with a guide portion 3e3 that guides the movable member 3d by sandwiching the angle adjustment portion 3d2 in contact with the contact portion 3e2 from both sides.

The preparation means 3h includes a frame portion 3h1 slidably disposed on the upper surface of the movable member 3d, and a slide member 3h2 movable integrally with the frame portion 133 and disposed so as to face both side surfaces of the movable member 3d. and a threaded portion 3h4 screwed into the movable member 3d via a long hole 3h3 formed in the slide member 3h2. By tightening the screw portion 3h4, the positions of the frame portion 3h1 and the slide member 3h2 with respect to the movable member 3d are fixed. By loosening the screw portion 3h4, it is possible to slide the frame portion 3h1 together with the slide member 3h2 along the upper surface of the movable member 3d. If the positions of the legs 6 of the piano 1 and the frame portion 3h1 do not match, loosen the screw portion 3h4 and slide the frame portion 3h1 and the slide member 3h2 to a desired position, then tighten the screw portion 3h4 to adjust the position of the frame portion 3h1. The position is adjusted.

In the support 2 of this embodiment, the already described ball unit 5 is arranged on the inner periphery of the frame portion 3h1 on the upper surface of the movable member 3d. In order to roughly position the ball unit 5, the upper surface of the movable member 3d, which becomes the first rolling surface 56, is provided with a locking portion 9 (projecting portion 76) that is inserted into the center hole 54 of the retainer 52 of the ball unit 5. ) is formed. An annular gap α is provided between the outer circumferential surface of the protrusion 76 and the inner circumferential surface of the retainer 52, and this gap α allows the balls 51 of the ball unit 5 to move on the first rolling surface 56. It becomes possible to roll in any direction along the first rolling surface 56.

As shown in FIG. 9, the legs 6 of the piano 1 are placed on the ball unit 5. At this time, a base portion 74 shown in FIG. 1 may be attached to the lower end of the leg 6, and in that case, the base portion 74 is placed on the ball unit 5. It is desirable that the lower end surface of the leg 6 be formed into a spherical shape so that all the balls 51 come into contact with the lower end of the leg 6 (including the base portion 74). Casters 7 are attached to the legs 6 so as to protrude laterally. The wheels 71 of the caster 7 are rotatably supported by side plates 73 fixed to the legs 6. When the legs 6 are placed on the ball unit 5, the wheels 71 are in a floating state with respect to the floor surface 4. Moreover, the center line O1 of the leg 6 and the rotation center O2 of the wheel 71 of the caster 7 are at positions shifted in the horizontal direction.

By arranging the ball unit 5 between the leg 6 and the first support part 3 in this way, the upper surface of the movable member 3d in the frame part 3h1 becomes the first rolling surface 56 on which the balls 51 of the ball unit 5 roll. Thus, the spherical lower end surface of the leg 6 becomes a second rolling surface 57 on which the ball 51 also rolls. During the performance of the piano 1, the balls 51 of the ball unit 5 slightly roll in any direction along the first rolling surface 56 in response to vibrations transmitted from the legs 6. Therefore, similarly to the first embodiment and the second embodiment, a decrease in the degree of freedom of vibration in the piano 1 can be avoided, and the sound quality can be improved.

According to the third embodiment, since the curved angle adjustment part 3d2 is in contact with the contact part 3e2 of the base member 3e, the movable member 3d can be swung in the vertical direction at one end (the left end in FIG. 9). It becomes possible to move. Therefore, the inclination of the movable member 3d can be adjusted by changing the screwing amount of the fastening member 3f into the female thread 3e1 and the thickness of the spacer 3g. Note that when the legs 6 are placed on the support 2, a clockwise moment acts on the movable member 3d due to the weight of the piano 1 in the clockwise direction in FIG. The inclination angle of the movable member 3d can be fixed. Therefore, the use of the spacer 3g is not essential.

Generally, with long-term use, the legs 6 of the piano 1 gradually deform in a direction such that two adjacent legs 6 form a V-shape. If this deformation is left unaddressed, the piano 1 becomes difficult to vibrate in the horizontal direction, and the sound quality of the piano 1 changes.

On the other hand, in the support 2 of the third embodiment, as shown in FIG. 9, the legs 6 are placed on the ball unit 5 with the upper surface of the movable member 3d inclined with respect to the horizontal plane. , the reaction force acting on the leg 6 has a horizontal component. If the direction of inclination of the movable member 3d is determined so that a reaction force including a horizontal component force is generated in the direction in which the deformation of the leg 6 is corrected, the sound quality of the piano 1 can be restored to its original quality by correcting the deformation of the leg 6. It can be recovered. In particular, with this support 2, as described above, the inclination angle of the movable member 3d can be changed, so the magnitude of the horizontal component force acting on the legs 6 can be adjusted, and the tone quality of the piano 1 can be adjusted. This has the advantage of making it possible to

[Fourth embodiment]
Hereinafter, a support 2 according to a fourth embodiment of the present invention will be described based on FIG. 11.

The support 2 of the fourth embodiment includes a support member 3a as the first support part 3, and a ball unit 5 disposed on the support member 3a.

The support member 3a connects the first leg portion 31, the second leg portion 32, and one ends (upper ends) of the first and second leg portions 31 and 32, similar to the support member 3a of the first embodiment. It has a bridge part 33 integrally. For example, the support member 3a of this embodiment can be obtained by bending a band-shaped metal plate at two places and bending the bent portions into an arc shape. The legs 31 and 32 both have arcuate cross sections, but unlike the first embodiment, the legs 31 and 32 are spaced apart from each other. The first leg part 31 and the second leg part 32 are spaced apart in the direction in which the axle 72 of the caster 7 extends, and when the leg 6 of the piano 1 is placed on the bridge part 33, the caster 7 is separated from the first leg part 32. It is arranged between the leg part 31 and the second leg part 32.

A bolt 36 is screwed into the first leg portion 31 and the second leg portion 32 so as to pass through both. By tightening the nut 37 screwed into the tip of the bolt 36, the first leg portion 31 and the second leg portion 32 are elastically deformed in a direction toward each other, thereby increasing the rigidity of the support member 3a. Therefore, by adjusting the tightening amount of the nut 37, it is possible to change the rigidity of the support member 3a and perform articulation.

Further, by tightening the tightened nut 37, the height of the support member 3a is reduced. Therefore, the support member 3a can be lifted off the floor 4 while the wheels 71 of the casters 7 are brought into contact with the floor 4, thereby making it possible to move the piano. By tightening the nut 37, the height of the support member 3a increases, so that the wheels 71 of the caster 7 can be lifted off the floor 4 while the support member 3a is in contact with the floor 4. When the wheels 71 are separated from the floor surface 4, the casters 7 (for example, the wheels 71) may vibrate and cause noise. If this point becomes a problem, it is desirable to tighten the caster 7 (for example, the wheel 71) and integrate it with the leg 6 using fixing means such as a lock tie.

The ball unit 5 is arranged between the bridge portion 33 of the support member 3a and the leg 6 of the piano 1. In this case, the upper surface of the bridge section 33 becomes the first rolling surface 56, and the lower surface of the leg 6, for example, the lower surface of the base section 74 (not shown in FIG. 11) attached to the leg 6, becomes the second rolling surface 57. A protruding portion 76 as a locking portion 9 is provided on the upper surface of the bridge portion 33 . The protrusion 76 is inserted into the center hole 54 of the retainer 52 via a radial gap. This protrusion 76 prevents the ball unit 5 from falling off from the support member 3a.

During the performance of the piano 1, the balls 51 of the ball unit 5 slightly roll in any direction along the first rolling surface 56 in response to vibrations transmitted from the legs 6. Therefore, similarly to the first embodiment and the second embodiment, a decrease in the degree of freedom of vibration in the piano 1 can be avoided, and the sound quality can be improved.

[Fifth embodiment]
In the embodiment described above, the second track member providing the second rolling surface 57 is constituted by the leg 6 of the piano 1 or a member (base part 74) attached to the leg 6, but it is a separate part from the leg 6. , and a member not attached to the leg 6 can also be used as the second track member. In the fifth embodiment shown in FIG. 12, a second support section 10 that is not attached to the leg 6 is arranged between the ball unit 5 and the leg 6, and a second track member 10a is provided on the second support section 10. ing.

The support 2 of the fifth embodiment includes a first support part 3 on the floor surface 4 side, a second support part 10 on the sound source side, and a ball disposed between the first support part 3 and the second support part 10. Unit 5 is the main component. A cylindrical upright portion 3i1 is formed in the first raceway member 3i as the first support portion 3, and a first rolling surface 56 is provided on the upper surface of the first raceway member 3i located within the upright portion 3i1. An annular protruding wall portion 3i2 that protrudes in the inner radial direction is formed on the inner periphery of the upright portion 3i1. The projecting wall portion 3i2 faces the retainer 52 of the ball unit 5 in the radial direction with a radial gap α therebetween, and the projecting wall portion 3i2 and the retainer 52 can be engaged in the radial direction. That is, the projecting wall portion 3i2 functions as the locking portion 9 described above.

The second support portion 10 includes a second track member 10a and a support member 10b attached above the second track member 10a. A second rolling surface 57 is provided on the lower surface of the second track member 10a, and the legs 6 are placed on the upper surface of the support member 10b. A screw shaft 10b1 is formed below the support member 10b, and by screwing this screw shaft 10b1 into the second track member 10a, the second track member 10a and the support member 10b are fixed.

A peripheral wall 10a1 is formed along the entire circumference at the edge of the lower surface of the second track member 10a, and a radial gap γ is formed between the peripheral wall 10a1 and the ball 51. By radially engaging the peripheral wall 10a1 with the ball 51, the ball unit 5 is prevented from falling off from the second track member 10a. A cover 11 is arranged around the shaft portion of the support member 10b with a gap in the radial direction. The lower end of this cover 11 is placed on the upper end surface of the upright portion 3i1 of the support member 3i. By arranging the cover 11, the appearance of the support 2 can be improved. The cover 11 is movable in the radial direction and the vertical direction.

Also in this embodiment, while the piano 1 is being played, the balls 51 of the ball unit 5 slightly roll in any direction along the first rolling surface 56 in response to vibrations transmitted from the legs 6. Therefore, similarly to the first to fourth embodiments, a reduction in the degree of freedom of vibration in the piano 1 can be avoided, and the sound quality can be improved. It also has the advantage that the ball unit 5 can be placed regardless of the form of the leg portions 6 or the base portion 74.

[Sixth embodiment]
The sixth embodiment shown in FIGS. 13 to 15, like the fifth embodiment, uses a support 2 that uses a member that is separate from the legs 6 and is not attached to the legs 6 as the second track member. This is an example.

In this support 2, similarly to the fifth embodiment, the second rolling surface 57 is provided on the second track member 10a serving as the second support section 10, which is located closer to the sound source than the ball unit. The second track member 10a is separate from the leg 6 and is not attached to the leg 6. The legs 6 are placed on the upper surface of the second track member 10a.

The first support part 3 includes a base plate 3j, a bottomed cylindrical support member 3k fixed on the base plate 31, a first track member 3m placed on the bottom surface of the support member 3k, and a semi-cylindrical support member 3k. It has a guide portion 3n. A first rolling surface 56 is provided on the upper surface of the first raceway member 3m. The ball unit 5 is arranged on the inner diameter side of the cylindrical upright portion 3k1 of the support member 3k.

As shown in FIG. 14, the base plate 3j has a wide part 3j1 formed in a semicircular shape in a plan view, a narrow part 3j2 in a rectangular shape in a plan view, and a smooth part between the wide part 3j1 and the narrow part 3j2. It integrally has a connecting portion 3j3 for connecting. The guide portion 3n is fixed to the wide portion 3j1 of the base plate 3j with the axis of the semi-cylindrical surface directed in the vertical direction. The guide portion 3n is arranged at a position facing the narrow portion 3j2 in the diameter direction of the ball unit 5, and is attached to the wide portion 3j1 of the base plate 3j using screws 12 or the like. A caster receiver 13 is attached to the narrow portion 3j1 of the base plate 3j using screws 14. When the legs 6 are placed on the second support part 10, the casters 7 are arranged on the inner diameter side of the caster receivers 13 without contacting the caster receivers 13.

The support 2 of this sixth embodiment is also arranged between the floor surface 4 and each leg 6, and supports the piano 1. At this time, as shown in FIG. 15, by wrapping an endless string 15 (thread, string, wire, etc.) around all the supports 2 in a tensioned state, the two adjacent legs 6 It is possible to prevent the sound from gradually deforming in a V-shaped direction, and it is possible to suppress changes in sound quality. Furthermore, by changing the tension state of the wire 15, articulation is also possible. The wire 15 can, for example, span the screw 14 of each support 2.

In the first to fifth embodiments, the first rolling surface 56 and the second rolling surface 57 were formed into flat surfaces, but in the sixth embodiment shown in FIG. The second rolling surface 57 is formed into a concave curved surface that is annular in plan view. As shown enlarged in FIG. 16, the first rolling surface 56 is formed into a concave curved surface in which the radius of curvature R1 of the radial cross section is larger than the radius r of the ball 51, and the second rolling surface 57 has a radius of curvature R1 larger than the radius r of the ball 51. The ball 51 is formed into a concave curved surface in which the radius of curvature R2 of the directional cross section is larger than the radius r of the ball 51.

At this time, the curvature radii R1 and R2 of the first rolling surface 56 and the second rolling surface 57 are such that the ball unit 5 is arranged on the first rolling surface 56 or the second rolling surface 57, and the ball unit 5 is When a horizontal force is applied to the retainer 52 without applying a vertical load, the retainer 52 becomes larger than the width of the pocket gap (the gap between the pocket 53 and the ball 51) of the retainer 52. It has a size that allows it to move over a large distance. Specifically, the curvature radii R1 and R2 of the radial cross sections of the first rolling surface 56 and the second rolling surface 57 may be 1.5 times or more, preferably twice or more, the radius r of the ball 51. desired. On the other hand, when no horizontal force is applied to the ball unit 5, each ball 51 autonomously moves to the deepest part of the first rolling surface 56 and the second rolling surface 57. It will be in contact with 57.

By forming the first rolling surface 56 and the second rolling surface 57 into concave curved surfaces having curvature radii R1 and R2 larger than the ball radius r, the first rolling surface 56 and the second rolling surface The balls 51 can roll in any direction along the surface 57, and the cage 52 can move in any direction on the horizontal plane. Therefore, it is possible to avoid a situation in which the vibrations of the legs 6 propagated from the piano 1 are restrained by the support 2, and the sound quality of the piano 1 can be improved.

Furthermore, since the position of the ball unit 5 with respect to the first rolling surface 56 and the second rolling surface 57 is determined autonomously, the above-mentioned locking portion 9 is not provided on the first raceway member or the second raceway member. Also, it becomes possible to prevent the ball unit 5 from falling off. Therefore, the structure of the support 2 can be simplified.

[Seventh embodiment]
In the support 2 of the seventh embodiment shown in FIGS. 17 and 18, a load transmission member 16 is arranged between the leg 6 and the second support part 10. The load transmission member 16 is formed in a shape that can be engaged with a small diameter portion 6a provided between the lower end of the leg 6 and the caster 7 in the vertical direction. As shown in FIG. 18, the load transmission member 16 of this embodiment includes a top plate part 16a, a side plate part 16b extending downward from one end of the top plate part 16a, and a bottom plate part connecting the lower ends of the side plate parts 16b. 16c. The top plate portion 16a is provided with slits 16d that reach the other ends of the top plate portion 16a. A space surrounded by the top plate part 16a, side plate part 16b, and bottom plate part 16c is open at both ends in the direction in which the slit 16d extends. The slit 16d has a width dimension into which the small diameter portion 6a can be inserted. By inserting the small diameter portion 6a into the slit 16d, the wheels 71 of the caster 7 are accommodated in the internal space of the load transmission member 16, and in this state, the top plate portion 16a engages with the lower end of the leg 6, so that the leg 6 The load transmitted from the second support part 10 is transmitted to the second support part 10. There is a gap between the wheels 71 of the casters 7 and the bottom plate portion 16c.

A first track member 3p as the first support part 3 is arranged on the receiver 17 arranged on the floor surface 4, and a second track member 10a as the second support part 10 is arranged below the load transmission member 16. Placed. The ball unit 5 is arranged between the first track member 3p and the second track member 10a. The first rolling surface provided on the first raceway member 3p and the second rolling surface provided on the second raceway member 10a may have a flat surface shape or a concave curved surface shape as shown in FIG. 16. The effects obtained from the above configuration are the same as those of the first to sixth embodiments, so a description thereof will be omitted.

[Eighth embodiment]
In the support 2 of the eighth embodiment shown in FIG. 19, the load transmission member 16 is arranged between the leg 6 and the second support part 10, as in the seventh embodiment. The load transmission member 16 of the eighth embodiment has a concave cross-sectional shape that integrally includes an inverted conical side portion 16e and a bottom portion 16f provided at the lower end of the side portion 16e. The wheels 71 of the casters 7 are placed in contact with the bottom portion 16f. It is also possible to make the wheels 71 contact the side portion 16e and not contact the bottom portion 16f.

A first track member 3q as the first support part 3 is arranged on the floor surface 4, and a second track member 10a as the second support part 10 is arranged below the load transmission member 16. A ball unit 5 is arranged between the first track member 3q and the second track member 10a. The first rolling surface provided on the first raceway member 3q and the second rolling surface provided on the second raceway member 10a may have a flat surface shape or a concave curved surface shape as shown in FIG. 16. The effects obtained from the above configuration are the same as those of the first to sixth embodiments, so a description thereof will be omitted.

Note that one or both of the flat first rolling surface 56 and the second rolling surface 57 described in the first to fifth embodiments may have a concave shape as used in the sixth embodiment. It can also be replaced with curved rolling surfaces 56 and 57.

In the above description, the support 2 is used to support a piano, but each embodiment can also be used to support other musical instruments, and can also be used to support speakers. .

1 Piano 2 Support 3 First support part 4 Floor surface 5 Ball unit 6 Legs 7 Casters 8 Braking device 9 Locking part 10 Second support part 51 Ball 52 Retainer 56 First rolling surface 57 Second rolling surface r Radius of ball R1 Radius of curvature of first rolling surface R2 Radius of curvature of second rolling surface

Claims (10)

A support disposed between a floor surface and a musical instrument or speaker serving as a sound source, and supporting the musical instrument or speaker,
The support includes a first support part supported on a floor surface and a ball unit disposed on the first support part,
The ball unit includes a plurality of balls and a holder that holds the plurality of balls arranged in a circumferential direction, and the holder has penetrating holes that accommodate the balls at a plurality of locations in the circumferential direction. A ball retaining portion having a hole-shaped pocket is provided at both ends in the thickness direction of the retainer on the inner surface of the pocket of the retainer, and prevents the balls from falling off from the retainer;
The first support portion is provided with a first rolling surface on which the balls of the ball unit roll,
A support for a musical instrument or a speaker, characterized in that the first rolling surface has a shape that allows a ball to roll in any direction along the first rolling surface. 2. The musical instrument or speaker support according to claim 1, wherein the first rolling surface is annular and has a concave curved surface having a radius of curvature of a radial cross section larger than the radius of the ball. The instrument or speaker support according to claim 2, wherein the radius of curvature of the radial cross section of the first rolling surface is 1.5 times or more the radius of the ball. The instrument or speaker support according to claim 1, wherein the first rolling surface is formed into a flat surface. The first support portion is provided with a locking portion that faces the retainer of the ball unit in the radial direction with a radial gap therebetween, and the locking portion is capable of engaging with the retainer in the radial direction. 1. The instrument or speaker support according to item 1. further comprising a second support portion disposed closer to the sound source than the ball unit,
A second rolling surface on which the ball rolls is provided in the second support part,
6. The musical instrument or speaker support according to claim 1, wherein the second rolling surface has a shape that allows a ball to roll in any direction along the second rolling surface. 7. The musical instrument or speaker support according to claim 6, wherein the second rolling surface is formed into a concave curved surface having a radius of curvature of a radial cross section larger than a radius of the ball. 8. The instrument or speaker support according to claim 7, wherein the radius of curvature of the radial cross section of the second rolling surface is 1.5 times or more the radius of the ball. The instrument or speaker support according to claim 6, wherein the second rolling surface is formed into a flat surface. The second support portion is provided with a locking portion that faces the retainer of the ball unit in the radial direction with a radial gap therebetween, so that the locking portion can be engaged with the retainer in the radial direction. 6. The instrument or speaker support according to 6.

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