JPH0759210B2 - 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 by closing the members 4 and 5, and the acoustic characteristics in the theater can be kept substantially constant between when the seat is vacant and when the player is seated. 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. High and
Since it is necessary to operate the shield plates 6a and 6b smoothly,
There is a restriction on the shape of the part in which 6b is built, 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 is configured such that the upper surface of the seat portion and the front surface of the backrest portion are substantially sound absorbing, and the lower surface of the seat portion and the back surface of the backrest portion are formed. The seat portion of the chair for the theater hall, which is substantially reflective, is fixed to the fixed seat, and the base end portion is rotatably attached to the front end portion of the fixed seat and the base end surface is attached to the front end surface of the fixed seat. It is composed of a movable seat that can be brought into and out of contact with each other, and at least a part of the front end surface of the fixed seat and the base end surface of the movable seat is configured to absorb sound. The base end face is in contact with the front end face when seated.

[0009]

In the theater hall chair of the present invention, when the movable seat is rotated when the seat is empty, the base end surface of the movable seat is separated from the front end surface of the fixed seat, and the respective surfaces are exposed. , The sound absorbing power of the chair alone increases so as to approach the total sound absorbing power of the spectator and the chair when sitting, and at the time of sitting, the base end surface abuts on the tip end surface of each other. Since the surfaces of the chairs are hidden from each other, it is possible to prevent the sound absorbing power from increasing more than necessary for the chair alone excluding the audience.

That is, as a chair, when the seat is vacant, it is possible to obtain a sound absorption force which is almost the same as the sound absorption force of the spectator and the clothes that occupy most of the sound absorption force when the seat is seated. 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, the structure can be simplified and the manufacturing cost can be reduced.

[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 structure in which it can be separated into two from a substantially central portion thereof, and a fixed seat 14 supported and fixed to the support 13 and a base end portion of the fixed seat 14 at the tip end portion thereof. The movable seat 15 is movably supported. In this fixed seat 14, a decorative cloth 17 is covered on the surface of a cushion body 16 made of a material having elasticity and sound absorption such as polyurethane and glass wool, and a reflection plate 18 made of a material that reflects sound is further provided on the lower surface thereof. This structure allows the upper surface 14a and the tip surface 14b to have a predetermined sound absorbing force and the lower surface 14c to have a reflecting power.

The movable seat 15 is also constructed in the same manner as the fixed seat 14, and a cushion body 19 made of the same material as the above is covered with a cloth 20 and a reflection plate 21 is attached to the lower surface thereof. With this configuration, the upper surface 15a, the front end surface 15b and the base end surface 15c have a predetermined sound absorbing force, and the lower surface 15d has a reflecting force. The fixed seat 14 and the movable seat 15 are connected to each other via a shaft 23 arranged at the upper edge of each of the front end face 14b and the base end face 15c, and the coil spring ( Due to the urging force of (not shown),
The movable seat 15 rotates about the shaft 23 to rotate the backrest 11
Stops at a position where the movable seat 15 does not come into contact with the movable seat 15, that is, a position where the movable seat 15 stands up substantially vertically, and when the seat is seated, the movable seat 15 is rotated against the urging force by the force applied by the spectator.
The base end surface 15c of the above is in contact with the front end surface 14b of the fixed seat 14.

The backrest portion 11 is supported by the support member 13 and is provided on the front surface of the reflecting plate 25 extending upward from the base end edge of the reflecting plate 21 of the fixed seat 14 and the cushion members 16, 19 are provided. Cushion body 26 made of the same material as
The front surface 26a of the cushion body 26 when the seat is vacant.
That is, the sound absorbing surface is exposed, and the front side 2 is
6a is hidden. Further, a cushion 30 similar to the one described above is provided on the inner side surface of 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.

In the theater hall chair having such a structure, however, the lower surfaces 14c and 15d of the fixed seat 14 and the movable seat 15 of the seat portion 10 and the back surface of the backrest portion 11 have the reflection plates 18 and 21, respectively. Since it is composed of 25, a sufficient reverberation time can be obtained.

When the seat is vacant, the movable seat 15 has the shaft 2
Since it rotates around 3 and separates from the fixed seat 14, the front end surface 14b of the fixed seat 14 and the base end surface 15c of the movable seat 15 are exposed, so that the upper surface 14a of the fixed seat 14 of the seat portion 10 and the movable seat 15 are exposed. In addition to the sound absorbing power by the upper surface 15a of 15 and the front end surface 15b, the front surface 26a of the cushion body 26 of the backrest portion 11 and the cushion body 30 of the inner side surface of the armrest 12, the sound absorbing power of only the front end surface 14b and the base end surface 15c. And the sound absorption of the chair alone approaches the total sound absorption of the spectator and the chair when seated, and when seated, the base end surface 15c of the movable seat 15 abuts on the tip end surface 14b of the fixed seat 14. Since the surfaces are concealed, it is possible to prevent the sound absorbing power from increasing more than necessary for the chair alone excluding the audience.

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. Further, by covering a part of the front end surface 14b of the fixed seat 14 and the base end surface 15c of the movable seat 15 with a reflection plate, it is possible to increase or decrease the sound absorption area on the front end surface 14b and the base end surface 15c. The power can be adjusted.

When the seat is vacant, the movable seat 15 separates from the fixed seat 14 and rotates around the shaft 23 and stops at a position where it stands up almost vertically, which is necessary for the movement of the spectator in front of the chair. It is possible to secure a sufficient space. Moreover,
Since the front surface of the backrest portion 11 is not hidden by the movable seat 15, the sound absorbing force does not decrease due to the separation of the movable seat 15. 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. It is possible to increase the cushioning property, the design property (luxury), and the like.

[0019]

As described above, according to the theater hall chair of the present invention, the base end surface of the movable seat is separated from the front end surface of the fixed seat by rotating the movable seat when the seat is empty. Since each surface is exposed, the sound absorption capacity of the chair alone in this exposed part increases to approach the total sound absorption capacity of the spectator and the chair when seated, and when seated, the above-mentioned base surface Since the end faces come into contact with each other to conceal each other's faces, it is possible to prevent the sound absorbing force from increasing more than necessary for the chair alone excluding the audience.

Therefore, 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 its clothes, which occupy most of the sound absorption force when seated, and at the same time, the sound absorption force of the chair 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.

When the seat is vacant, the movable seat rotates about the tip of the fixed seat as a fulcrum and stops at a position where it stands up almost vertically, so that a space necessary for the movement of the spectator is provided in front of the chair. You can secure enough. Further, unlike the conventional case, since a shield plate and a mechanism for moving the shield plate are not required, the structure can be simplified and the manufacturing cost can be reduced, and the cushioning property as a chair, the design (luxury), etc. Can be increased.

[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 Part 11 Backrest Part 14 Fixed Seat 14b Tip Surface 15 Movable Seat 15c Base End Surface 18,21,15 Reflector

Claims (1)

[Claims] 1. A theater hall chair in which the upper surface of the seat portion of the chair and the front surface of the backrest portion are substantially sound absorbing and the lower surface of the seat portion and the back surface of the backrest portion are substantially reflective. The seat portion is composed of a fixed seat and a movable seat whose base end portion is rotatably attached to the tip end portion of the fixed seat and whose proximal end surface is attached to and detached from the tip end surface of the fixed seat by this rotation. With the configuration, at least a part of the front end surface of the fixed seat and the base end surface of the movable seat is configured to be sound absorbing, and the base end surface of the movable seat is separated from the front end surface of the fixed seat when the seat is vacant, and when seated. A chair for a theater hall, wherein the base end face is in contact with the front end face.