JPH084541B2 - 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 A chair for a general theater hall 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. ing.

By the way, in the theater hall chair having such a structure, since the cushion, the fabric and the like are excellent in sound absorption, the entire chair tends to absorb sound too much.
When this chair is installed in a theater, there is an inconvenience that the reverberation time cannot be made sufficiently long due to the acoustic characteristics in the theater.

Further, in the conventional chair for theater hall,
Since the sound absorbing power is different when the seat is occupied by the audience and when the seat is empty (the seated seat absorbs more sound depending on the costume of the audience), so the reverberation characteristics in the theater are the same as when the seat is empty. It had the drawback of making it very different from time to time. (Fig. 3 is a diagram showing the results of measuring reverberation characteristics when the seat is empty 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 It is shorter when it is full.)

Therefore, in a theater equipped with a chair having a conventional structure, there is a difference in performance sound between a rehearsal performance performed when a seat is vacant and a production performance performed when the seat is full, and the performer is confused when performing the performance. The inconvenience had occurred.

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 portions are 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, since the sound absorbing power of the spectator's costume etc. when seated is generally larger than the sound absorbing power of the chair alone, there is a limit to reducing the difference in the sound absorbing power. There is a drawback in that the compensation of the difference cannot be achieved completely.

Therefore, the applicant of the present application has proposed a chair for a theater hall which can solve the above problems in Japanese Utility Model Publication No. 62-512. As shown in FIG. 4, in this theater hall chair, 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 2 is formed. , 6b are slidably arranged, and in the empty state, the hole 5 of the shield plate 6a and the bottom plate 3a.
The holes 4 and 5 of the shield plate 6b and the holes 4 of the back plate 2b are aligned with each other.

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 end portion of the adjusting screw 8 to the lower surface plate 3a. Move in the B direction. Further, one end of the lever 9 is pressed by the projection 3c on the rear part of the frame 3 so that the lever 9 rotates about the shaft 9a as a fulcrum, and the other end of the shield plate 6b.
Is pressed, whereby the shield plate 6b moves in the direction of arrow D. In this way, the shield plates 6a and 6b move, the shield plates 6a and 6b are displaced, and the holes 4 and 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 so that the sound absorbing property of the chair as a whole is great. The sound absorbing properties are reduced due to the closing of 4, 5. In other words, according to this chair, the sound absorption variable configuration can sufficiently compensate for the difference in the sound absorption described above, and the acoustic characteristics in the theater can be kept substantially constant between empty seats and seated seats. In this case, it is possible to easily realize the reverberation time as long as possible.

However, in the above theater 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 high, and the shield plates 6a and 6b are smooth. Since it is necessary to operate the shield plates 6a, 6a
There is a restriction on the shape of the part in which b is incorporated, and there is a drawback that the degree of freedom in designing the chair is reduced.

[0011]

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.

[0012]

In order to solve the above-mentioned problems, a theater hall chair according to the present invention has at least a seat portion.
Part of the movable seat is configured as a rotatable
When the end side is facing the lower part of the backrest in a substantially horizontal state and the rear end
This is so that the
The movable seat is pivotally supported and hidden when the movable seat is in a substantially horizontal state.
Fewer chair surfaces exposed when overturned
At least a part of the structure is sound absorbing, and the movable seat part is omitted when the seat is empty.
As a standing state, the sound absorption around the movable seat of the chair is increased.
When you sit down, the movable seat part should be in a substantially horizontal position
This is to reduce the sound absorption around the part.

[0013]

The chair for the theater hall of the present invention is
The movable seat part is exposed in a substantially upright position.
As the sound is added , the sound absorption of the chair alone increases to approach the total sound absorption of the spectator and the chair when seated, and when seated, the pressing force associated with the seating of the spectator directly acts and moves. The seat is almost horizontal and the movable seat is almost upright.
The sound-absorbing chair structure surface that was exposed in the state is covered up
Since the sound absorbing power decreases by that amount, it is possible to prevent the sound absorbing power from increasing more than necessary for the chair alone excluding the audience.

That is, as the chair, when the seat is vacant, it is possible to obtain a sound absorption force that is almost equal to the sound absorption force of the spectator and the clothes that occupy most of the sound absorption force when sitting, and at the same time, the sound absorption force that the chair is involved in is taken. It is possible to make it as small as possible, 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 to be substantially the same.

Further , since the shield plate and the mechanism for moving the shield plate are not required inside the chair , the structure can be simplified and the manufacturing cost can be reduced.

[0016]

1 and 2 are views showing an embodiment of a chair for a theater hall according to the present invention. In the figure, reference numeral 20 is a support for a chair, and the support 20 has a pair of side plates 22 which are provided with an armrest portion 21 at an upper end thereof and which is vertically fixed to a floor surface.
And the back plate 23 hung over the rear edges of these side plates 22.
And a lower surface plate 24 fixed substantially horizontally between the central portions of the side plates 22. The front end of the lower surface plate 24 has a side plate 22.
It is located behind the front edge of the. In addition, these side plates 2
2, the back plate 23 and the bottom plate 24 are all made of a reflective material that reflects sound.

A cushion body 25 made of a material having elasticity and sound absorption, such as polyurethane and glass wool, is fixed to the front surface of the back plate 23, and a back cloth portion 27 is formed by covering the surface thereof with a decorative cloth 26. Has been done. Similarly, a fixed seat portion 30 including a cushion body 28 and a cloth 29 is also provided on the upper surface of the lower surface plate 24, and the surfaces of the backrest portion 27 and the fixed seat portion 30 are sound absorbing.

On the other hand, in front of the fixed seat portion 30, each side plate 2 is provided.
A movable seat portion 32 is rotatably arranged by a horizontal shaft 31 that is bridged between the center portions of the two front end edges. In this movable seat portion 32, a cushion body 34 is fixed to both surfaces of a flat plate-shaped core material 33 having a protruding portion 33A on the lower surface of the front end portion, and the cushion body 34 is covered with a cloth 35, except for the protruding portion. The portion covered with the cloth 35 is sound absorbing and the protrusion 33A is reflective. The horizontal shaft 31 is inserted near the center of the front end of the movable seat portion 32.

Further, the movable seat 32 is provided with an urging means and a stopper (not shown), and when vacant, the urging means allows the urging means to jump up to an upright position along the front edge of the side plate 22 (substantially upright state) and to sit down. Sometimes movable seat 3
2 is rotated rearward, the lower surface of the rear portion of the movable seat 32 contacts the upper front surface of the fixed seat portion, and the rear end side of the movable seat 32 has a backrest.
It opposes the lower part of the bent portion 27 (in a substantially horizontal state) and is locked by a stopper at this position against the biasing means. In addition, the locking by the stopper is performed by the movable seat portion 32.
It can be easily released by standing up.

On the other hand, on the inner surface side of each side plate 22, there is formed a sound absorbing portion 36 in which a cushion body is covered with a cloth in the same manner as described above at a position facing the waist and thighs of a human body when seated, and the inner surface side of each side plate is formed. A reflective cushion body 37 that reflects sound is fixed to the other portions.

In the chair for a theater hall having the above structure, the movable seat portion 32 is supported at a position jumped up from the fixed seat portion 30 when the seat is vacant, and the sound absorbing lower surface of the movable seat portion 32 and the sound absorbing upper surface of the fixed seat portion 30 are supported. And are exposed, and the sound absorption of the chair as a whole is great. On the other hand, when the spectator sits on this chair, the movable seat portion 32 is pressed against the fixed seat portion 30, as shown in FIG.
The sound absorbing upper surface is closed, and the front surface of the sound absorbing backrest portion 27, the upper surface of the movable seat portion 32, and the sound absorbing portion 36 of each side plate 22 are covered by the human body. Therefore, assuming that the sound absorbing power of the entire chair when seated is B and the sound absorbing power when the seat is empty is A, the relationship is expressed by the following equation.

B = A + --- where: Sound absorbing force of the human body surface not in contact with the chair: Of the respective surfaces of the backrest portion 27, the movable seat portion 32, and the side plate sound absorbing portion 36, the portion covered by the human body when seated Sound absorption force: Sound absorption force of the surfaces of the movable seat portion 32 and the fixed seat portion 30 that abut each other when seated

Therefore, by setting = + in the above equation, it is possible to make the acoustic characteristics when the seat is vacant and when seated in the theater substantially constant. Especially in this example, the area of the part and the sound absorption can be set large,
Is easy to realize.

Further, in this example, the seat portion of the chair is fixed to the fixed seat portion 3
0 and the movable seat portion 32, and the simple structure in which the movable seat portion 32 is rotatable, the manufacturing cost is lower and the operation is more reliable than the conventional example in which the shield plate is slidably incorporated.
At the same time, compared to the conventional example, there are less restrictions on the shapes of the backrest portion 27 and the seat portion 30, and, for example, a shape with a large number of curved surfaces can be adopted, and there is an advantage that the degree of freedom in design is large. Further, when the user is seated, a cushioning effect can be obtained by the rotation of the movable seat portion 32, so that the shock of sitting can be alleviated and the movable seat portion 32 is rotated, so that the user can stand in front of a chair and sit down at the waist. The movable seat portion 32 can be smoothly rotated without using a hand only by lowering it, and the seating operation is easy.

Further, in this example, a horizontal shaft 31 is provided near the center of the movable seat portion 32, and the movable seat portion 32 is provided with the horizontal shaft 31 when the seat is empty.
Since it stands upright along the front edge of the second chair 2, there is also an advantage that a wide passage space between the chair and the front chair can be secured in the theater.

The present invention is not limited to the above embodiment, but the shape and configuration of each part can be changed appropriately. For example,
Although the movable seat portion 32 is supported by the horizontal shaft 31 in the above-described embodiment, the movable seat portion 32 may be supported by a leaf spring having elasticity instead of the horizontal shaft 31 to serve also as the urging means. Also,
The rotation center of the movable seat portion 32 may be set at the front end portion thereof. Further, the backrest portion 27 is composed of a movable back portion and a fixed back portion, and when the seat is vacant, the sound absorbing surfaces formed on the opposing surfaces are separated from each other, and when the seating is performed, the sound absorbing surfaces are brought into contact with each other, thereby further adjusting the sound absorbing power. It is also possible to enhance the effect.

[0027]

As described above, in the theater hall chair according to the present invention, when the seat is empty, the movable seat portion is in a substantially upright position.
And was covered up when the movable seat was in a substantially horizontal state.
The surface of the chair that absorbs sound is exposed, and the sound absorbing power of the chair alone increases so as to approach the total sound absorbing power of the seated spectator and the chair. On the other hand, when the audience in this chair is seated, wearing of the audience
The pressing force associated with the seat acts directly, and the movable seat is approximately horizontal.
When the movable seat is in the upright position, it is exposed.
The surface of the sound-absorbing chair is covered up and the sound-absorbing power is reduced accordingly.
Therefore, it is possible to prevent the sound absorbing power from increasing more than necessary for the single chair excluding the audience.

Therefore, if the increase in sound absorption due to the presence of the spectator and the decrease in sound absorption when seated are set equal, the occupant who occupies most of the sound absorption when seated when the chair alone is vacant It is possible to obtain almost the same sound absorbing power as the sound absorbing power of the clothes, and it is possible to minimize the sound absorbing power that the chair is involved in when sitting, so that the reverberation characteristics when the seat is vacant and the reverberation characteristics when seated are reduced. The reverberation time can be as long as possible and both can be made almost the same.

Further, since the movable seat portion is rotated in response to seating of the audience, the sound absorbing chair component surface is concealed to adjust the sound absorbing force, so that the manufacturing cost is low and the operation is reliable. At the same time, there are less restrictions on the shape of each part than before,
For example, a shape with many curved surfaces can be adopted, and the advantage that the degree of freedom in design is large can be obtained. Furthermore, when seated, in addition to the cushioning effect obtained by rotating the movable seat part,
Since the movable seat part is configured to rotate, the seat part can be seated easily by standing in front of a chair and sitting down to rotate the movable seat part without using a hand.

[0030]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a chair for a theater hall according to a first embodiment of the present invention when the seat is vacant.

FIG. 2 is a longitudinal sectional view showing the same embodiment when seated.

FIG. 3 is a graph showing measurement results of reverberation characteristics in a general theater.

FIG. 4 is a vertical cross-sectional view showing an example of a conventional theater hall chair.

[Explanation of symbols]

 20 Support 21 Elbow Hook 22 Side Plate 23 Back Plate 24 Bottom Plate 27 Backrest 30 Fixed Seat 31 Horizontal Axis (Center of Rotation) 32 Movable Seat 36 Sound Absorber of Side Plate

Claims (1)

[Claims] 1. A with constituting a front surface of the upper surface and the backrest portion of the seat portion of the chair in a substantially sound-absorbing properties, in theater hall chair constructed in reflective back surface of at least the backrest portion, at least of said seat and part of a rotatable movable seat
Is configured, the movable seat is movable seat rear end of the backrest
With the horizontal position facing the lower part and the rear end side of the movable seat part upward
In order to be able to exhibit the substantially upright state rotated to
Is supported by a constant rotation axis Rutotomoni, movable seat is the substantially overturned hidden when in the horizontal state the substantially upright shape
At least a portion of the structure surface of the chair which is exposed when the state is configured to sound absorption, the chair of the movable seat a substantially upright state when unoccupied
Sound absorption around the movable seat is increased, and the sound is absorbed around the movable seat of the chair by setting the movable seat to a substantially horizontal state when seated.
Chairs for theater halls, which are designed to reduce sex .