JP2003159152A - Jump-up chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jump-up chair which can keep the difference of sound absorbing performance between being occupied and vacant to the minimum and is suitable for a concert hall, a theater, a movie house, etc. <P>SOLUTION: This is a chair with the seat enabled to jump up to the back side. A sound absorbing material is equipped on the lower face part of the seat part. Sound absorbing capacity can be easily controlled optimum by the sound absorbing material. The difference of sound absorbing performance between being occupied and jumped up vacant can be kept minimum. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flip-up chair, and mainly relates to a concert hall capable of improving the acoustic characteristics of a room, particularly adjusting reverberation time characteristics, and maintaining a desired sound absorbing property. The present invention relates to a flip-up chair suitable for a theater, a theater, a movie theater, and the like (hereinafter, simply referred to as “hall”).

[0002]

2. Description of the Related Art In a hall which is used for a multipurpose purpose such as a concert or a play, for example, a reverberation time is set to be long in order to increase the reverberation at a concert, and the clarity of sound is emphasized at the time of a play. It is desirable to set the reverberation time short.

Conventionally, a so-called flip-up chair whose seat portion can be flipped up to the back side is installed in such a hall, but a normal flip-up chair cannot adjust the sound absorption volume. Moreover, since the sound absorption power when the occupant is seated in such a chair is different from that when the vacant seat is empty (the sound absorption power when seated is often greater depending on the spectator's costume etc.). However, there is a drawback that it makes a big difference when the seat is empty and when it is full.

Therefore, although it is considered that the chair is made of a material having a large sound absorbing force to reduce the difference in sound absorbing force, it is still difficult to eliminate the difference in sound absorbing force. Incidentally, such chairs for halls are configured to use a lot of elastic members such as cushions for each part from the viewpoint of sitting comfort and design, and to cover the back part and seat part with textiles etc. . In this case, the entire chair tends to absorb sound too much because the cushions and fabrics are thick and have excellent sound absorption.
When such a chair is installed in the hall, there is an inconvenience that the reverberation time cannot be made sufficiently long due to the acoustic characteristics in the hall.

It is also conceivable that the portion covered by the spectator when seated has a sound absorbing structure and the other portions have a reflective structure. By doing so, it is possible to reduce the difference in sound absorption between when seated and when seated, and it is possible to eliminate the above inconvenience to some extent. In some cases, the sound absorption capacity of the chair may be greater than that of the chair itself, so there is a limit to reducing the difference in the sound absorption capacity.

Further, Japanese Utility Model Publication No. 62-512 proposes another theater chair. In this chair,
The upper surface of the seat portion and the entire surface of the backrest portion (backrest surface) are formed of sound absorbing members, while the frame of the seat portion and the back plate of the backrest portion are formed of members that reflect sound. A large number of holes are formed in the bottom plate of the frame and the back plate of the backrest, and a blocking plate having many similar holes is slidably arranged inside the seat and the backrest. It has a mechanism that adjusts the sound absorption volume by shifting each blocking plate. However, this chair has a disadvantage that the structure is complicated and the cost is high because the blocking plate is built in, and the shape and structure of the chair itself is restricted due to the sliding of the blocking plate.

Further, in Japanese Patent Laid-Open No. 300819/1993, the upper surface of the seat portion and the front surface of the backrest portion have substantially the same sound absorbing property, and the lower surface of the seat portion and the back surface of the backrest portion have substantially the same reflective property. A chair composed of is proposed. However, even in this case, there is still a limit to keeping the sound absorbing force substantially constant between when the seat is vacant and when the user is seated, and it is still difficult to freely change the sound absorbing force.

[0008]

DISCLOSURE OF THE INVENTION The inventors of the present invention pay attention to the structure of the flip-up chair and the relationship between the sound absorption force when the seat is vacant and when the seat is seated. The present invention has been completed by finding that the above-mentioned conventional problems can be solved.

That is, the object of the present invention is to improve the above-mentioned drawbacks of the prior art, to suppress the difference in sound absorption between seated and vacant seats to a very small extent, and to reduce the sound absorption value as much as possible. It is to provide a flip-up chair that can be minimized and is preferably used mainly for halls.

Another object of the present invention is that the structure is simple and the degree of sound absorption can be adjusted and changed depending on the occasion.
It is to provide a flip-up chair suitable for a hall.

[0011]

In order to solve the above-mentioned problems, the flip-up chair according to the present invention comprises a sound absorbing member provided on the lower surface of the seat portion.

In this flip-up chair, it is preferable that the lower part of the chair back portion is extended downward so as to cover the rear surface of the sound absorbing member. Further, it is preferable that the sound absorbing member is detachably attached to the lower surface portion of the seat portion.

It is preferable that such a sound absorbing member is made of a cloth made of ultrafine fibers. Further, it is preferable that the cushion back portion of the chair and / or the surface portion of the cushion portion of the seat portion is also made of a cloth made of ultrafine fibers. A fabric made of these ultrafine fibers can be formed into a non-woven fabric or a woven or knitted fabric.

The flip-up chair according to the present invention is suitable for a hall such as a concert hall, a theater hall, and a movie theater.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings along with preferred embodiments. The technical concept of the flip-up chair of the present invention is that the cushion and the woven or knitted fabric, etc., which are excellent in sound absorption in the seat portion and the back portion are thinned or reduced to suppress the sound absorption by the members constituting the chair as much as possible, and the seat portion The sound absorbing member is arranged in the lower part, and when the user sits down, the sound absorbing member is covered by the human body such as the foot, so that the sound absorbing effect of the sound absorbing member itself is lowered, and the sound absorbing force of the spectator's clothes when sitting is utilized. On the other hand, when the seat is empty, the seat portion of the chair is flipped up to the back side, so that the sound absorbing member at the lower portion of the seat is effectively exposed to the space, and the sound absorbing effect of the sound absorbing member is sufficiently exerted. In this way, it is possible to substantially maintain a desired and constant sound absorption property both when seated and when the seat is vacant, and to provide a high-quality chair with stable sound absorption coefficient.

Next, the flip-up chair of the present invention will be described with reference to the drawings. FIG. 1 shows a flip-up chair according to an embodiment of the present invention, and is a side view showing a state when the chair is used, and FIG. 2 shows a state where the seat portion of the chair of FIG. 1 is flipped up. It is a side view.

In FIG. 1, a flip-up chair 10 basically comprises a back plate 3 comprising a back plate 1 and a cushion part 2, and a seat plate 4.
The seat portion 6 is composed of a cushion portion 5, and a leg 7. The seat portion 6 is attached to the leg 7 by a hinge 8 so as to be flipped up to the back portion 3 side.

One of the features of the present invention is that the sound absorbing member 9 is provided on the lower surface of the seat portion 6 of the flip-up chair 10, and the sound absorption volume depends on the sound absorbing member 9 and the costume of the spectator when sitting. It is adjusted by the correlation of sound absorption.

For the sound absorbing member 9 of the present invention, a cloth made of ultrafine fibers is preferably used. A fabric made of such ultrafine fibers has, for example, a single fiber fineness of 0.0
001 to 1 denier, more preferably 0.01 to 0.7
Nonwoven fabrics and knitted fabrics made of ultrafine fibers such as denier and napped products thereof are mentioned, but nonwoven fabrics having a random single fiber structure are preferable from the viewpoint of sound homogeneity. In the cloth made of such ultrafine fibers, the sound entering the cloth is less likely to be reflected, and the sound is uniformly attenuated and the tuning effect is exerted particularly in the high-pitched range, so that a gentle feeling of security is provided to humans. The cloth made of the ultrafine fibers may be impregnated with a binder such as polyurethane, if necessary. The level of sound absorption volume can be adjusted by changing the thickness, density, etc. of the cloth, and it is also possible to stack a plurality of cloths.

In a hall or the like, it is preferable to absorb such a sound as much as possible, because a sound of a kind that cannot be heard and a kind of sound that gives an unpleasant feeling are not desirable for human hearing pattern recognition. The cloth made of ultrafine fibers that is preferably used as the sound absorbing member in the present invention can efficiently reject these sounds. A fabric composed of ultrafine fibers having a single fiber fineness of 0.0001 to 1 denier is basically composed of ultrafine fiber groups, and the ultrafine fibers forming the ultrafine fiber group are aggregated in a state where they are vibrated by vibration energy. However, it is surprising that the use of such a material makes the audible sound quality clear and has no dull feeling and makes it glossy. The reason for this is not clear, but it is considered that the friction noise between fibers and the modulation due to the natural vibration are reduced.

Further, as the sound absorbing member 9, it is possible to use a material having a large sound absorbing property, such as compressed glass wool or coarse wool felt, and the level of sound absorption can be adjusted by changing the volume or the like. However, in the case of the sound absorbing member 9 made of such a material,
It is preferable to cover the surface with a suitable fabric. As the cloth, a cloth made of the above ultrafine fibers is suitable.

Further, the sound absorbing member 9 can be a sound absorbing member having a different sound absorbing coefficient each time in order to provide a sound absorbing coefficient according to a user's request, and can be detachably attached to the lower surface of the seat portion. Further, the sound absorption member 9 itself can be configured to be able to adjust the sound absorption volume, for example, by making the amount of the sound absorption member 9 increase or decrease.

In the flip-up chair of the present invention, the cushion portion 5 of the seat portion 6 and the cushion portion 2 of the back portion 3 can be made to have a low sound absorption volume in order to more effectively exert the above-mentioned functions. It is preferable to make it thin. These thicknesses are, for example, 0.5 cm to 2 cm.
Can be

Further, in the flip-up chair of the present invention, as shown in FIG. 1, it is preferable that the lower portion thereof extends downward (toward the floor) so that the back portion 3 covers the rear surface of the sound absorbing member 9. Further, if necessary, the right and left side surfaces of the sound absorbing member 9 may be covered with a reflecting plate or the like so as to reduce the sound absorbing effect.

In the flip-up chair 10 thus constructed, when the seat is empty, the sound absorbing member 9 is effectively exposed to the space due to the jumping up of the seat portion 6 as shown in FIG.
The sound absorbing force of the sound absorbing member 9 is utilized, and when seated, as shown in FIG. 1, the front part of the sound absorbing member 9 is hidden by the feet, and the rear part of the sound absorbing member 9 is hidden by the back part 3. The increase in quantity can be reduced.

That is, the sound absorption at the time of sitting depends mainly on the costume of the spectator, while the sound absorption at the time of vacant seat is mainly performed by the sound absorbing force of the sound absorbing member 9 on the lower surface of the seat portion 6 which is flipped up toward the back portion 3, The sound absorption coefficient can be stabilized.

In the conventional chair, since the cushion portion is configured to be relatively thick in order to emphasize the sitting comfort, most of the sound absorption volume in the chair is determined by this cushion portion, and since the cushion portion is thick, Even if the sound absorbing member 9 is provided as in the present invention, the degree of freedom in space is lost when the sound absorbing member 9 is flipped up. On the other hand, in the flip-up chair 10 according to the present invention, the cushion portion 5 can be made thin, while the sound absorbing member 9 can be made thick or thin, so that the sound absorption volume can be controlled regardless of the basic structure of the chair. Like

In the flip-up chair 10 according to the present invention, the material forming the cushion portion 2 and the cushion portion 5 is not particularly limited, but a viscoelastic foam material or a viscoelastic rubber-like material is used to improve the sitting comfort. It is preferable to use a viscoelastic cushion material having such stress relaxation property. By using a viscoelastic cushioning material with stress relaxation property, the stress on the parts such as the back and buttocks where the chair is touched and the pressure is applied can be homogenized, and the hold property and the slip property can both be achieved. You can maintain comfort without getting tired when sitting for hours. A panya such as foamed polyurethane may be used together with the cushion portion.

Further, in the present invention, the cushion portion 2
It is preferable to cover the surface of the cushion portion 5 with cloth or the like. As the cloth, the cloth made of the ultrafine fibers described above is preferably used.

The flip-up chair according to the present invention can of course be used in general households, but is particularly preferably used in auditoriums such as schools, concert halls, theaters, and halls such as movie theaters.

[0031]

As described above, according to the flip-up chair of the present invention, the basic structure of the chair can be maintained without changing the basic structure of the chair, the amount of seats, backs, cushions (panyas) and the like. As it is, the sound absorbing force can be easily adjusted only by changing the volume of the sound absorbing member, so that various tone settings desired by the user can be optimally met. Further, it is possible to design so as to increase the sound absorption coefficient when the seat is vacant and reduce the difference from the sound absorption coefficient when the user is seated, and it is possible to provide a flip-up chair suitable for use in a hall or the like where a certain acoustic characteristic is required.

[Brief description of drawings]

FIG. 1 is a side view showing a state when a flip-up chair according to an embodiment of the present invention is used.

FIG. 2 is a side view showing a state where the seat portion of the flip-up chair of FIG. 1 is flipped up (empty seat state).

[Explanation of symbols]

1 backboard 2 cushion part 3 back 4 seat plate 5 Cushion 6 seats 7 legs 8 hinges 9 Sound absorbing member

Continued front page    (72) Inventor Sadataka Fujibayashi             2-2-1 Nihombashi Muromachi, Chuo-ku, Tokyo             Toray Co., Ltd.Tokyo business site (72) Inventor Mitsuru Tanabe             Osaka Prefecture Osaka City Kita-ku Dojima 1-6-20 East             Re Co., Ltd.Osaka office F-term (reference) 3B084 JA07 JC00                 3B099 FA10

Claims (8)

[Claims] 1. A flip-up chair characterized in that a sound absorbing member is provided on a lower surface portion of a seat portion. 2. The flip-up chair according to claim 1, wherein a lower portion of the back of the chair extends downward so as to cover a rear surface of the sound absorbing member. 3. The flip-up chair according to claim 1, wherein the sound absorbing member is detachably attached to a lower surface portion of the seat portion. 4. The flip-up chair according to claim 1, wherein the sound absorbing member is made of a cloth made of ultrafine fibers. 5. The flip-up chair according to claim 1, wherein the cushion portion of the chair back portion and / or the surface portion of the cushion portion of the seat portion is made of a cloth made of ultrafine fibers. 6. The flip-up chair according to claim 4, wherein the cloth is a non-woven fabric. 7. The flip-up chair according to claim 4, wherein the cloth is a woven or knitted fabric. 8. The flip-up chair according to claim 1, which is a chair used for halls.