JPH084540B2 - 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 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 portion of the frame body 3 and the lever 9 rotates about the shaft 9a as a fulcrum, and the other end of the lever 9 shields 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 part is rotatable,
The end side is located at approximately the same height as the rear end side of the movable seat part and is approximately horizontal
State and the front end side of the movable seat is higher than the rear end side of the movable seat.
This movable seat part is
Supports rotation and conceals when the movable seat is in a substantially horizontal position and jumps up.
At least some of the chair components that are exposed when in a state
Is configured to absorb sound, and when the seat is empty, the movable seat is in a jumping state.
Increase the sound absorption around the lower part of the movable seat of the chair,
When the seat is seated, the movable seat is set in a substantially horizontal state, and the movable seat of the chair is
It is designed to reduce the sound absorption around the lower part .

[0013]

The chair for the theater hall of the present invention is
Absorbing sound from the chair surface exposed by the movable seat jumping up
Extent that gender is added, with sound absorption in the chair itself is increased to approach the overall sound absorption sitting upon the audience and the chair, at the time of sitting, the movable seat and the pressing force act directly with the seated audience The part is almost horizontal and the movable seat part is jumping up.
The surface of the sound-absorbing chair that was exposed at that time was covered up.
Since the sound absorbing power is reduced by the amount of, the sound absorbing power can be prevented from increasing more than necessary for the chair alone excluding the audience.

That is, as a single chair, when the seat is vacant, it is possible to obtain almost the same sound absorption force as that of the spectator and the clothes that occupy most of the sound absorption force when seated. Can be made as small as possible, so that the reverberation characteristics when the seat is vacant and the reverberation characteristics 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.

[0015]

1 and 2 are views showing a first embodiment of a chair for a theater hall according to the present invention. Reference numeral 20 in the figure
Is a support for a chair, and this 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 bottom plate 24 fixed substantially horizontally between the central portions of the side plates 22. The side plate 22, 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 decorative cloth 26 is put on the surface of the cushion body 25 to form a backrest portion 27. 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, on the fixed seat portion 30, there is arranged a movable seat portion 34 in which the cushion material 32 is fixed on both surfaces of the core plate 31 and the whole is covered with a cloth 33, and the rear end portion is fixed. In the vicinity of the rear end of the seat portion 30, the seat portion 30 is supported by a horizontal shaft 35 spanned between the side plates 22 so as to be vertically rotatable. Further, the movable seat portion 34 is provided with a biasing means (not shown), and when the seat is empty, the backrest portion 27 as shown in the drawing.
It is jumped up to a position that does not reach.

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 theater hall chair having the above structure, when the seat is empty, the movable seat portion 34 is supported at a position jumped up from the fixed seat portion 30 ( jumped up state), and the sound absorbing lower surface of the movable seat portion 34 and the fixed seat portion are supported. The sound absorbing upper surface of 30 is exposed, and the sound absorbing power of the chair as a whole is large. On the other hand, when the audience this chair is seated, the front end of the movable seat 34 movable seat 34 is pressed against the fixed seat portion 30 as shown in FIG. 2
The rear end side is supported at approximately the same height (substantially horizontal
State), together with the upper surface of the lower surface and the fixed seat 30 of the movable seat 34 is closed, the front surface of the backrest 27, the movable seat 3
The upper surface of 4 and the sound absorbing portion 36 of each side plate 22 are hidden by the human body. Therefore, the sound absorption of the entire chair when seated is B,
Assuming that the sound absorption force when the seat is vacant is A, the relationship is expressed by the following equation.

B = A + --- where: Sound absorption of the human body surface not in contact with the chair: Of the respective surfaces of the backrest portion 27, the movable seat portion 34, 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 34 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,
Since the area and sound absorption of the part 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 34, and the movable seat portion 34 has a simple structure that allows the movable seat portion 34 to rotate. Therefore, 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. Furthermore, since the movable seat portion 34 is kept in a state of jumping up when the seat is vacant, a cushioning effect is obtained by the rotation of the movable seat portion 34 when seated, and the sitting comfort is good.

The present invention is not limited to the above embodiment, but the shape and configuration of each part can be changed as appropriate. For example,
Although the movable seat 34 is supported by the horizontal shaft 35 in the above-described embodiment, the movable seat 34 may be supported by an elastic arm or the like to serve as the biasing means. Also, the back portion 2
7 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 seat is seated, the sound absorbing surfaces are brought into contact with each other to further enhance the sound absorbing property adjusting effect. Good.

[0024]

As described above, in the theater hall chair of the present invention , when the seat is empty, the movable seat portion is in a jumping state.
Sound absorption that was hidden when the movable seat was in a substantially horizontal state.
The surface of the chair is exposed, and the sound absorption capacity of the chair alone increases to approach the total sound absorption capacity of the spectator and the chair when seated.

On the other hand, when the spectator sits in this chair, the spectator
The pressing force that accompanies the sitting of the
Exposed when the movable seat is in a jumping state when it is in a substantially horizontal state.
The sound-absorbing chair structure surface that had been
Since it decreases, it is possible to prevent the sound absorbing power from increasing more than necessary for the chair alone 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 sound absorption by the spectator and the clothes that occupy most of the sound absorption when seated when the chair alone is vacant It is possible to obtain almost the same sound absorption power as the above, and it is also possible to minimize the sound absorption power that the chair is involved in when sitting, so that the reverberation characteristics of the empty seat and the reverberation characteristics when seated are as long as possible. Both can be in the same state.

Further, since the movable seat portion is rotated with the seating of the audience to cover the sound absorbing chair constituent surface to adjust the sound absorbing power, 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 in the conventional case, and for example, shapes with many curved surfaces can be adopted, and there is an advantage that the degree of freedom in design is large. Furthermore, when seated, a cushioning effect is obtained by the rotation of the movable seat portion, and the sitting comfort is good.

[0027]

[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 special reverberation 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 34 Movable Seat 35 Horizontal Shaft 36 Side Plate Sound Absorber

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 Part of the movable seat is configured as a rotatable movable seat , and the movable seat has a front end side that is the rear end side of the movable seat.
And a substantially horizontal position at the same height as the front end of the movable seat.
Side is rotated upward from the rear end side of the movable seat part
It is supported by a predetermined rotation axis so that each can be presented.
Re Rutotomoni, the lift-up state overturned hidden when the movable seat is the substantially horizontal state
At least one of the chair's components exposed at
The seat part is configured to absorb sound, and when the seat is empty, the movable seat part is set in a jumping state and the movable seat of the chair is
Increases sound absorption around the lower part of the seat, and when seated, the movable seat
Sound absorption around the movable seat of the chair
The chair for the theater hall, which is characterized in that