JPH0811086B2 - 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 general theater hall chair has a structure in which a large number of 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 fabric or the like. ing.

By the way, in such a theater hall chair, sound absorption power is different depending on whether the seat is seated by a spectator or when the seat is vacant. Therefore, there is a drawback that the reverberation characteristics in the theater are largely different between when the seats are empty and when they are full. For example, FIG. 9 is a diagram showing a result of measuring reverberation characteristics when a seat is vacant and when the seat is full in a theater equipped with a normal chair. As is clear from this figure, the sound reverberation time in the theater is shorter when the seats are full than when the seats are empty. Therefore, in a theater equipped with conventional chairs,
There was a difference in performance sound between the rehearsal performance performed when the seats were vacant and the real performance performance when the seats were full, which caused inconvenience of the performer during the performances.

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. As shown in FIG. 10, this chair is configured such that the upper surface 1A of the seat portion 1 and the backrest surface 2A of the backrest portion 2 are made of a sound absorbing material, while the frame 3 of the seat portion 1 and the back plate of the backrest portion 2 are formed. Reference numeral 4 is made of a material that reflects sound. A large number of holes 3A ..., 4A ... Are formed in the lower surface of the frame 3 and the back plate 4, and similar holes 5A are formed in the inner surfaces of the frame 3 and the back plate 4.
, 6A ... are arranged slidably, and in the vacant state shown in the drawing, the hole 6A of the shield plate 6 and the hole 4A of the back plate 4, the hole 5A of the shield plate 5 and the frame body are provided. The holes 3A of 3 match each other.

On the other hand, when a spectator is seated on this chair, the seat 1 tilts forward about the axis 7 and the shield plate 5 in the seat 1 is projected by the member 9 fixed to the pipe 8. The holes 3A ... And the holes 5A. At the same time, one end of the arm 11 fixed to the shaft 10 is pushed and rotated by the frame body 3, and the other end of the arm 11 pushes the shield plate 6 to shift the holes 4A ... And the holes 6A. ing.

In the chair having the above structure, the sound absorbing surfaces 1A and 2A are exposed when the seat is vacant, and the holes 3A and 5A and the hole 4 are provided.
A and 5A coincide with each other to open, and the sound absorption of the chair as a whole increases. On the other hand, when seated, the sound absorbing surfaces 1A and 2A are covered by the human body, and at the same time, the holes 3A and 5A and the holes 4A and 6A are closed, resulting in a significant decrease in sound absorption. And can be kept almost constant.

[0007]

However, in the above-mentioned theater hall chair, a large number of holes 5A, 6 are provided in the portion which is not covered up when the audience is seated, that is, on the rear surface side such as the backrest.
The shielding plates 5 and 6 having A are provided, and the pressing force to the seat portion or the like accompanying the seating of the audience is indirectly transmitted to the rear surface side through the intervening link mechanism or the like. Since the structure is such that it is moved, the driving force is not directly transmitted, the structure is complicated, the manufacturing cost is high, and it is necessary to operate the shielding plates 5 and 6 smoothly. However, there are drawbacks such as a low degree of freedom in design as a chair.

[0008]

The present invention has been made to solve the above-mentioned problems, and is separated from each other in a vacant state and joined to each other in a occupant state at least at a part of a portion covered by a human body when the occupant is seated. The chair has a movable part and a fixed part, and at least a part of the contact surface between the movable part and the fixed part is configured to absorb sound.

[0009]

In this theater hall chair, when the user is seated, the movable part is directly pressed against the fixed part by the pressure accompanied by the seating of the audience, and the sound absorbing surface provided in these abutting parts is closed. The sound absorbing power of the chair decreases, and the total sound absorbing power substantially depends only on the sound absorbing power of the audience.
Further, when the seat is vacant, the movable portion is separated from the fixed portion and the contact surfaces thereof are exposed, so that the sound absorbing force of the chair alone increases.

[0010]

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, which is formed by fixing the cushion material 32 on both sides of the core plate 31 and further covering the whole with a cloth 33, and fixing the rear end portion to the fixed seat portion. 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, at the position facing the waist and thighs of the human body when seated, a sound absorbing portion 36 is formed by covering the cushion body with a cloth in the same manner as described above, 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-described structure, the movable seat portion 34 is supported at a position jumped up from the fixed seat portion 30 when the seat is empty, and the sound absorbing lower surface of the movable seat portion 34 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 a spectator is seated in this chair, the movable seat 34 is moved to the fixed seat 30 as shown in FIG.
And the lower surface of the movable seat portion 34 and the upper surface of the fixed seat portion 30 are closed, and the front surface of the backrest portion 27,
The upper surface of the movable seat portion 34 and the sound absorbing portion 36 of each side plate 22 are hidden 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 power 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.

Next, FIGS. 3 and 4 show a second embodiment of the present invention, in which the lower plate 40 and the fixed seat portion 4 are used.
The width of 1 in the front-rear direction is smaller than that of the above-described embodiment, and the movable seat portion 42 is supported by a horizontal shaft 43 that is hung between the center portions of the front ends of the side plates 22 so as to be vertically rotatable. The movable seat portion 42 is formed by fixing a cushion body 45 and a cloth 46 to a flat plate-shaped core member 44 having a protrusion 44A on the lower surface of the front end thereof, except for the protrusion 44A.
Further, a biasing means (not shown) is attached to the movable seat portion 42,
When the seat is vacant, it is flipped up to an upright state. On the other hand, when the user is seated, the movable seat portion 42 pivots rearward so that the lower surface of the rear end portion thereof comes into close contact with the upper surface of the fixed seat portion 41. The other parts are the same as those in the first embodiment.

In the chair of this example, the sound absorbing force adjusting effect is obtained as in the case of the above-described embodiment, and since the movable seat portion 42 is configured to rotate rearward, the user should stand in front of the chair and sit at the waist. There is an advantage that the movable seat portion 42 can be smoothly rotated without using a hand only by lowering it.

Further, in this example, since the movable seat portion 42 stands upright along the front end edge of the side plate 22 when the seat is vacant, the passage space with the chair installed in the front in the theater is wider than that in the above embodiment. Can be taken.

Next, FIGS. 5 and 6 show a third embodiment of the present invention. In this example, movable seat portions 52 having a lower surface plate 51 are arranged side by side in front of the fixed seat portion 50, and the movable seat portions 52 are movable. A rear end upper portion of the seat portion 52 and a front end upper portion of the fixed seat portion 50 are connected by a horizontal shaft 53 so as to be vertically rotatable, and their abutting surfaces are sound absorbing surfaces. Further, the movable seat portion 52 is flipped up to an upright position by an urging means (not shown) when the seat is empty. Then, when the spectator sits down, the movable seat portion 52 rotates, and the rear end surface of the movable seat portion 52 comes into close contact with the front end surface of the fixed seat portion 50. Other configurations are the same as those in the above-mentioned respective embodiments.

Also in this example, the same acoustic characteristic adjusting effect as that of the above-described embodiment can be obtained. Also, when this seat is vacant,
Since the movable seat portion 52 stands up to the height of the armrest portion 21 along the front end of each side plate 22, there is an advantage that the passage space can be wide and the appearance is compact as in the second embodiment.

Next, FIGS. 7 and 8 show a fourth embodiment of the present invention. In this example, the seat portion 60 is a fixed seat portion 61 fixed to the upper surface of the lower plate 24, and the fixed seat portion 61. The movable seat 62 is disposed on the upper side and has a substantially same size, and the movable seat 62 is provided between the fixed seat 61 and the movable seat 62.
A plurality of biasing means 63, such as a spring, for lifting a predetermined distance are interposed. The movable seat portion 62 and the fixed seat portion 61 have sound absorbing properties over the entire surface.

On the other hand, the backrest portion 65 is composed of a fixed back portion 66 fixed to the back plate 23, and a movable back portion 68 supported in parallel with the fixed back portion 66 with a plurality of springs 67 with a gap. In addition, these also have sound absorbing properties over the entire surface. When the spectator is seated, the lower surface of the movable seat portion 62 is in close contact with the fixed seat portion 61, and the rear surface of the movable back portion 68 is in close contact with the front surface of the fixed back portion 66. The distances between the movable seat portion 62 and the fixed seat portion 61 and between the movable back portion 68 and the fixed back portion 66 are set such that a predetermined sound absorbing force can be obtained on the respective facing surfaces.

In this example as well, the same sound absorbing effect as in each of the above-described embodiments can be obtained, and the spring 63
The elastic force of ..., 64 has the advantage that the cushioning effect when seated is excellent. The present invention is not limited to the above-described embodiments, but the shape of each part may be changed or the characteristic points of each embodiment may be combined.

[0026]

As described above, the chair for the theater hall is provided at the portion where the movable portion is directly pressed against the fixed portion by the pressure accompanying the seating of the audience when seated. The sound absorbing surface is blocked and the sound absorbing power of the chair is reduced, and the total sound absorbing power can be made to depend on only the sound absorbing power of the spectator, and unnecessary reduction of reverberation time due to the chair can be prevented. At the same time, when the seat is vacant, the movable part is separated from the fixed part and the sound absorbing surface provided at the abutting portions is exposed, so that the sound absorption capacity of the chair alone can be arbitrarily increased. In addition, it is possible to provide the same level of sound absorption as the sound absorption of the spectator and the chair as a whole when seated (mainly the sound absorption of the human body of the spectator).

As a result, it is possible to keep the reverberation time when the seat is vacant and when the seat is seated in a theater or the like as small as possible, and to keep the two substantially the same. Further, since the fixed part and the movable part are brought into contact with each other directly by seating the spectator, 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.

[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 vertical cross-sectional view of the first embodiment when seated.

FIG. 3 is a view similar to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a view similar to FIG. 2 showing the second embodiment.

FIG. 5 is a view similar to FIG. 1, showing a third embodiment of the present invention.

FIG. 6 is a view similar to FIG. 2 showing the third embodiment.

FIG. 7 is a view similar to FIG. 1, showing a fourth embodiment of the present invention.

FIG. 8 is a view similar to FIG. 2 showing the fourth embodiment.

FIG. 9 is a graph showing measurement results of reverberation characteristics in a general theater.

FIG. 10 is a vertical sectional view showing an example of a conventional theater hall chair.

[Explanation of Codes] 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 Sound Absorbing Part 40 Side Plate 41 Fixed Seat 42 Movable Seat 43 Horizontal shaft 50 Fixed seat part 51 Lower surface plate 52 Movable seat part 53 Horizontal shaft 61 Fixed seat part 62 Movable seat part 63 Biasing means 66 Fixed back part 67 Biasing means 68 Movable back part

Claims (1)

[Claims] 1. A movable part and a fixed part, which are separated from each other in the empty state and are joined to each other in the seated state, are provided in at least a part of a portion which is covered by a human body when the user is seated. A chair for a theater hall, characterized in that at least a part of the chair is configured to absorb sound.