JPH0789972B2 - Chair for theater hall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair for a theater hall capable of improving acoustic characteristics in a theater hall.

[0002]

2. Description of the Related Art Conventionally, a general theater hall chair has a structure in which many elastic members such as cushions are used for each part from the viewpoint of sitting comfort and design, and each part except the legs is covered with a fabric or the like. Has become. By the way, in a theater hall chair having such a configuration, since the cushion, the fabric, etc. have excellent sound absorbing properties, the entire chair tends to absorb sound too much. However, there is a problem in that the reverberation time cannot be made sufficiently long due to the acoustic characteristics of.

In a conventional theater hall chair, the sound absorbing power differs depending on whether the seat is seated by a spectator or when the seat is vacant (when seated, the sound absorbing power is greater depending on the spectator's costume and the like. However, there is a drawback that the reverberation characteristics in the theater are greatly different between when the seats are empty and when they are full. (Fig. 3 is a diagram showing the results of measuring the reverberation characteristics when the seat is vacant and when the seat is full in a theater equipped with a chair having a conventional structure. As shown in this figure, the reverberation time of sound in the theater is Therefore, in a theater equipped with a chair with a conventional structure, there is a difference in performance sound between the rehearsal performance performed when the seats are vacant and the production performance when the seats are full when the music performance is performed. The person was inconvenient during the performance.

Therefore, as a means for coping with such a problem, it is conceivable to construct the chair structure such that the portion covered by the spectator when seated is a sound absorbing structure and the other portion is a reflecting structure. That is, if the chair is configured in this way, the difference in sound absorption volume between when seated and when the seat is vacant can be made small, and the above inconvenience can be eliminated to some extent. However, even in such a chair, in general, the sound absorbing power of the spectator's costume or the like when seated is larger than the sound absorbing power of the chair alone, so that there is a limit to reducing the difference in the sound absorbing power, and There is a drawback in that it cannot completely compensate for the difference. Therefore, the applicant of the present invention has proposed a chair for a theater hall in Japanese Utility Model Publication No. 62-512, which can solve the above problems.

In this theater hall chair, as shown in FIG. 4, the upper surface 1a of the seat portion 1 and the front surface (back surface) 2a of the backrest portion 2a are made of a sound absorbing material while the seat portion 1 The frame 3 and the back plate 2b of the backrest 2 are made of a material that reflects sound. Further, a large number of holes 4 are formed in the lower surface plate 3a of the frame body 3 and the back plate 2b of the backrest portion 2, and a shielding plate 6a having a large number of similar holes 5 inside the seat portion 1 and the backrest portion 2a. , 6b are slidably arranged so that the hole 5 of the shield plate 6a and the hole 4 of the lower plate 3a, and the hole 5 of the shield plate 6b and the hole 4 of the back plate 2b are aligned with each other in the empty state. There is. On the other hand, in the seated state, the seat portion 1 rotates about the axis 7 in the direction of arrow E, whereby the shield plate 6a is pressed by the tip of the adjusting screw 8 in the direction of arrow B with respect to the lower plate 3a. Moving. Further, one end of the lever 9 is pressed by the protrusion 3c on the rear part of the frame body 3 to rotate the lever 9 about the shaft 9a as a fulcrum, and presses the shield plate 6b at the other end, whereby the shield plate 6b is moved by the arrow. Move in D direction. In this way, the shield plates 6a, 6b move, the shield plates 6a, 6b are displaced, and the holes 4, 5 are closed.

In the chair having the above structure, when the seat is vacant, the sound absorbing surface is exposed and the holes 4 and 5 are opened to increase the sound absorbing power of the chair as a whole. The sound absorbing power is reduced due to the closing of 4, 5. That is, according to this chair, it is possible to sufficiently compensate for the difference in the sound absorption force described above due to the variable sound absorption force configuration,
It is possible to easily realize that the acoustic characteristics in the theater are kept substantially constant between when seated and when seated and the reverberation time in this case is made as long as possible. However, in the above-mentioned theater hall chair, since the shield plates 6a and 6b having a large number of holes 5 are provided inside and a mechanism for moving these shield plates 6a and 6b is provided, the structure is complicated and the manufacturing cost is low. In addition to being expensive, there is a restriction on the shape of the portion where the shielding plates 6a, 6b are built in because the shielding plates 6a, 6b must be operated smoothly, and there is a drawback that the degree of freedom in designing the chair is reduced.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to suppress the difference in sound absorption between seated seats and vacant seats to zero or a very small value, and to obtain a sound absorption value. It is an object of the present invention to provide a theater hall chair that has a simple structure and a low manufacturing cost while minimizing the above-mentioned problem.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an upper surface side of a seat portion and a front surface side of a backrest portion.
Is designed to be almost sound-absorbing, and the lower surface of the seat and the backrest are
Chairs for the theater hall with the rear side of the section made almost reflective
In the above, the upper surface of the seat is fixed to the support of the seat.
Made of a cushioned body with elastic and sound absorbing properties
The fixed seat and the cushion body of this fixed seat.
Elasticity that is biased and supported so as to be parallel and spaced upward and
A movable seat consisting of a cushioning body that absorbs sound is configured.
On the front side of the backrest, a support for the backrest is provided.
Fixed cushion with elasticity and sound absorption fixed to the
Parallel to the front of the fixed cushion.
It has elasticity and sound absorption that is biased to be supported
That the movable cushion is configured, when vacant, the seat
On the upper surface side, the cushion of the movable seat and the cushion of the fixed seat
And the front body of the backrest above.
On the surface side, the movable cushion and the fixed cushion are flat.
When the seat is separated from the line, the movable seat is placed on the upper surface side of the seat.
Cushion body contacts the cushion body of the fixed seat
Together with the movable cushion on the front side of the backrest part.
Is abutted against the fixed cushion .

[0009]

In the chair for the theater hall of the present invention, the seat
And double-layered cushion body provided on the backrest
When the seats are vacant, the
The sound absorbing power is large due to the exposed facing surfaces of the
In addition, the air layer between the cushions is virtually sound-absorbing
These sound-absorbing powers are effective for the audience when seated.
And the sound absorption by clothes can be compensated. Also,
The sound absorption generated by the cushion etc.
The sound absorption characteristics are consistent with the generation of sound absorption by clothes and clothes.
The feeling of strangeness is reduced over the entire band. Also,
When seated, the double-structured cushion bodies are
A large suction like when they are in contact with each other and are no longer separated.
Sound power cannot be generated. Therefore, the chair alone excluding the audience
As a result, the sound absorbing power hardly increases.

[0010] That is, as the chair, at the time of vacancy, it is possible to obtain a sound absorption of substantially the same size and almost the same quality as the sound absorption by the audience and his clothes dominate the sound absorption when seated, the chair when seated It is possible to extremely reduce the sound absorption force involved, so that the reverberation characteristic when the seat is vacant and the reverberation characteristic when the user is seated can be set to a state in which the reverberation time is as long as possible and both are substantially the same. Also, it is installed on the seat and backrest.
Cushion as a chair is a double structure cushioned body
It also greatly contributes to the improvement of the performance. Moreover, does not require a mechanism or the like for shielding plate and moving it, can the structure simple yet wear manufacturing costs low Kude.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a chair for a theater hall according to the present invention will be described below with reference to FIGS. 1 and 2. In these drawings, reference numeral 10 is a seat portion of a chair, 11 is a backrest portion, 12 is an armrest, and 13 is a support body for supporting them.

The seat portion 10 has a fixed seat (fixed portion) 14 supported and fixed to the support 13 and a movable seat (movable portion) 16 provided above the fixed seat 14 via a spring 15.
It consists of and. In this fixed seat 14, a decorative cloth 18 is covered on the surface of a cushion body 17 made of a material having elasticity and sound absorption such as polyurethane and glass wool, and a reflection plate 19 made of a material that reflects sound is further provided on the lower surface thereof. Ru der those mounting. Make up the cushion body
Porous sound absorbing materials such as polyurethane and glass wool
The sound absorption characteristics of the cloth and cloth are different from those of the
It is almost in line with the sound absorption characteristics due to
It has a sound absorbing characteristic. With this configuration the top surface
The contact surface 14a , the tip surface 14b, and the like have a predetermined sound absorbing force, and the lower surface 14c has a reflecting force.

The movable seat 16 is formed by covering the surface of the cushion body 20 made of the same material as described above with the cloth 21, and by this structure, a predetermined sound absorbing force is obtained on the entire surface. And in the seat part 10 of the said structure,
When the seat is vacant, the movable seat 16 is separated from the fixed seat 14 in parallel by the urging force of the spring 15, and when seated, the movable seat 16 moves downward against the urging force by the force applied by the spectator. Its lower surface (contact surface) 1
6a contacts the upper surface (contact surface) 14a of the fixed seat 14.

The backrest portion 11 is supported by the support 13 and extends upward from the base end edge of the reflection plate 19 of the fixed seat 14, and the front face portion of the reflection plate 22. Fixed cushion (fixed part) 23 embedded and fixed in
And a movable cushion (movable part) 25 provided in front of the fixed cushion (fixed part) 23 via a spring 24.
It consists of and. The fixed cushion 23 is a cushion body 26 made of the same material as that of the cushion body 17 and covered with a cloth 27. With this structure, the front surface 23a has a predetermined sound absorbing force.

The movable cushion 25 has a cushion 2 made of the same material as that described above on the surface of the cloth 2.
9 is covered with this structure, and a predetermined sound absorbing force is obtained over the entire surface. And the backrest part 1 of the said structure
In No. 1, when the seat is vacant, the movable cushion 25 is separated from the fixed cushion 23 in parallel by the urging force of the spring 24, and when the seat is seated, the movable cushion 25 is opposed to the urging force by the force applied by the spectator. The rear surface (contact surface) 25a of the fixed cushion 23 contacts the front surface (contact surface) 23a of the fixed cushion 23. Further, a cushion body 30 similar to the one described above is provided inside the armrest 12, and the cushion body 30, that is, the sound absorbing surface is exposed when the seat is vacant and is hidden by the spectator when seated. Then,
In the theater hall chair having such a configuration, the seat 1
Since the lower surface 14c of the fixed seat 14 of 0 and the back surface of the backrest portion 11 are constituted by the reflection plates 19 and 22,
A sufficient reverberation time can be obtained.

When the seat is vacant, the movable seat 16 is biased by the spring 15 and separated from the fixed seat 14.
Since the upper surface 14a of the fixed seat 14 and the lower surface 16a of the movable seat 16 are exposed and the movable cushion 25 is biased by the spring 24 and separated from the fixed cushion 23, the front surface 23a of the fixed cushion 23 and the rear surface of the movable cushion 25. 25a is exposed. Therefore, in addition to the sound absorption by the upper surface 16b of the movable seat 16 of the seat portion 10, the front surface 25b of the movable cushion 25, and the cushion 30 of the inner side surface of the armrest 12, the upper surface 14a of the fixed seat 14 and the lower surface 1 of the movable seat 16 described above.
6a and front 23a of the stationary cushion 23, that close to the overall sound absorption of the audience and the chair when seated by an amount sound absorption as a chair alone sound absorption is increased on the back 25a of the movable cushion 25. In addition, a porous sound-absorbing material layer such as glass wool is placed on the wall.
If an air layer is placed between the
Sound absorption that is almost the same as when the layer is filled with porous sound absorbing material
Although it is known to exhibit force, the configuration of the present invention
If so, when the seats are vacant, the cushion bodies are separated in parallel,
With the same effect, the air layer is practically equivalent to the sound absorbing material layer.
Therefore, a larger sound absorbing effect can be realized with less sound absorbing material.
Wear. Then, at the time of sitting, the top surface 1 of the fixing seat 14
The lower surface 16a of the movable seat 16 comes into contact with 4a, and the rear surface 25a of the movable cushion 25 comes into contact with the front surface 23a of the fixed cushion 23, so that the surfaces of the movable cushion 25 and the back surface 25a are hidden from each other. Can be prevented from increasing.

That is, this chair is
It is possible to obtain a sound absorption force that is almost the same as the sound absorption force of the audience and the clothes that occupy most of the sound absorption force when sitting, and it is also possible to minimize the sound absorption force that the chair is involved in when sitting. The reverberation characteristic and the reverberation characteristic when seated can be set in a state where the reverberation time is as long as possible and in which both are substantially the same. Furthermore, by covering a part of the upper surface 14a of the fixed seat 14, the lower surface 16a of the movable seat 16, the front surface 23a of the fixed cushion 23, and the rear surface 25a of the movable cushion 25 with a reflection plate, the sound absorbing area of these surfaces can be increased or decreased. If
It is possible to adjust the sound absorption force when the seat is vacant.

Further, the seat portion 10 and the backrest portion 11 respectively have two cushion bodies 17, 20 and 26, 28, and the cushion bodies 17, 20 and 26,
Since 28 are connected by the springs 15 and 24, respectively, the cushioning property as a chair is increased, and the springs 15 and 24 absorb the shock when seated, so that an unreasonable force may act on the spectator and the chair. There is no movable seat 1 due to the springs 15 and 24.
Since 6 and the movable cushion 25 follow the movement of the spectator, the sitting comfort is very good. Further, unlike the conventional chair shown in FIG. 4, since the shield plates 6a and 6b and the mechanism for moving them are not required, the structure can be simplified and the manufacturing cost can be reduced, and the chair can be used as a chair. The cushioning property, the design property (luxury), etc. can be increased.

[0019]

As explained above, according to the theater hall chair of the present invention, it is provided in the seat portion and the backrest portion.
The double structure cushion body is parallel to each other when vacant
The cushions are in a separated state, and the separated facing surface of each cushion is exposed.
The amount of sound that is output increases and the space between the cushion bodies increases.
Since the air layer in the room also has a practical sound absorbing effect,
The sound power compensates for the sound absorption by the spectators and clothes when seated.
You can In addition, sound absorption by cushions etc.
The performance depends on the generation and tracking of sound absorption by the audience and clothing when seated.
Sound absorption characteristics over almost the entire frequency range, with less discomfort
There will be nothing. When seated, the double structure
Cushion bodies contact each other and are no longer separated
A large sound absorbing force as in the case of cannot be generated. According to
As a single chair, excluding the audience, the sound absorption increases almost
There is nothing to do .

Therefore, as a single chair, when the seat is vacant, it is possible to obtain almost the same sound absorption power as the sound absorption power of the spectator and its clothes which occupy most of the sound absorption power when seated. At the same time, it is possible to minimize the sound absorption force that the chair is involved in while sitting,
As a result, the reverberation characteristic when the seat is vacant and the reverberation characteristic when the user is seated can be set to a state in which the reverberation time is as long as possible and both are substantially the same.

Further , the seat portion and the backrest portion are provided.
Double structure cushion body, movable seat and movable cushion
The spring for biasing and supporting the
Absorb the shots and follow the movement of the audience to enhance the sitting comfort
Cushioning as a chair for
It also greatly contributes to the improvement of brilliance. Also, as in the conventional and does not require a mechanism or the like for shielding plate and moving it, can the structure simple yet lower manufacturing costs
Can .

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a theater hall chair according to an embodiment of the theater hall chair of the present invention when the seat is empty.

FIG. 2 is a longitudinal sectional view of a main part of a chair for a theater hall when seated in FIG.

FIG. 3 is a diagram showing measurement results of reverberation characteristics in a theater hall in which a chair having a conventional structure is installed.

FIG. 4 is a vertical cross-sectional view of a main part of a conventional chair capable of keeping the reverberation characteristic substantially constant between an empty seat and a seat.

[Explanation of symbols]

 10 seat portion 11 backrest portion 14 fixed seat (fixed portion) 14a upper surface (contact surface) 16 movable seat (movable portion) 16a lower surface (contact surface) 19,21 reflection plate 23 fixed cushion (fixed portion) 23a front surface (currently) Contact surface 25 Movable cushion (movable part) 25a Rear surface (contact surface)

Claims (1)

[Claims] 1. A front side of a seat and a back side of a chair.
In a theater hall chair in which the lower side of the seat and the rear side of the backrest are substantially reflective, the upper side of the seat is supported on the upper side of the seat. Elasticity fixed to the body
Fixed seat consisting of a cushioning body with sound absorption and sound absorption,
And parallel to the cushion body of this fixed seat upward
Elasticity and sound absorption that are biased and supported to be separated
A movable seat is formed of a cushion body that is fixed to the backrest support body on the front side of the backrest portion.
Fixed cushion with defined elasticity and sound absorption,
And parallel to this fixed cushion and spaced forward
Elastically supported and elastically sound-absorbing
A dynamic cushion is configured, and when the seat is empty , the cushion of the movable seat is provided on the upper surface side of the seat.
If the cushion body of the fixed seat and the cushion body of the fixed seat are parallel and separated from each other,
The front side of the backrest and the movable cushion above
The seat and the fixed cushion are parallel and spaced apart from each other.
The cushion body of the movable seat on the upper surface side of the
Abut on the cushion body and front side of the backrest
A chair for a theater hall, wherein the movable cushion comes into contact with the fixed cushion on the side .