KOTOBUKI

KOTOBUKI's pioneering spirit is based on a confidencein our fundamental technologies which have been gained in manufacturing processes over many years research and planning abilities. KOTOBUKI continues to innovate its the level excellence in the design and engineering or quality products, and to provide total quality control ensuring total customer satisfaction.

See examples of the TS Custom series here >>> or configure your own TS chair here >>>

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• KOTOBUKI's custom designed chairs are based on a series of standard TS designes. more>>>

KOTOBUKI's pioneering spirit is based on a confidencein our fundamental technologies which have been gained in manufacturing processes over many years research and planning abilities. KOTOBUKI continues to innovate its the level excellence in the design and engineering or quality products, and to provide total quality control ensuring total customer satisfaction.

See examples of the TS Custom series here >>> or configure your own TS chair here >>>

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• Offering a wide range of seating products ensures that we can provide the seating solution for any venue regardless of its size or function.

Number and letter plates.

KOTOBUKI offers various sizes and methods of attaching plates. See the examples detailed above. Material is PVC / Aluminium. Typeface : round gothic 50 or square gothic 56 Color : red, black. Please contact our sales personnel in advance about the plate size and method of attachment of each product.

Generally, the number is assigned in the order of 1,2,3,... from left to right facing to the stage. The row letter is attached in the order of A,B,C,D,... from the first row.

KOTOBUKI's pioneering spirit is based on a confidencein our fundamental technologies which have been gained in manufacturing processes over many years research and planning abilities. KOTOBUKI continues to innovate its the level excellence in the design and engineering or quality products, and to provide total quality control ensuring total customer satisfaction.

See examples of the TS Custom series here >>> or configure your own TS chair here >>>

Number and letter plates.

To fold the back you have to rise it first and then fold it forward.

These chairs feature backs which can be folded when TV cameras and sound controller is set on above or when the chairs are stored under the stage.

Aisle with horaizontal/sloped floor

If the aisle has a horaizontal/sloped floor, the lights are installed in equal intervals along the aisle. Illuminance is measured on the center line of the aisle closest to the guiding lights, and the horaizontal illuminance is required to be 0.2 lux or more.
Minimum number of lights is more then (1/4 * length of the passageway - 1). (Standard established by the Tokyo Fire Department.)

Aisle with a tiered floor

If the aisle has a tiered floor, the full length of the aisle portion of the center line of each aisle tread is lit. In this case, the horaizontal illuminance is required to be 0.2 lux or more. (Standard established by the Tokyo Fire Department)

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• Aisle lights are lit by ordinary power supply. In case of the main power down, the emergency power should backup, ensuring the aisles are lit consistently.

During both normal times and emergency, a small 5W bulb is turned on. Since this device dose not have a built-in emergency power supply, a separate emergency power unit is required. Type approval no.4CL-01 Cover/hard polyvinyl chloride/ivory

Chair with built-in emergency power supply (type with integrated electric lighting and power supply) Type approval number: 4AX-1001 Cover/molded synthetic resin product/gray White LED lighting

A standard floor fi xing method for Kotobuki products is indicated as follows. Special floor requires the other method. Please contact our sales personnel for the most suitable method to your floor.

Concrete floor

Anchor bolt fixing (compression strength = 24N/mm2 ) Due to the strength of concrete floors, expansion type anchor bolts are used. In the case of light concrete floor (Light concrete floor, ALC board floor), the fixing method varies according to the material thickness and foundation structure.

Wooden floor

Setting by flanged hexagon head tapping screw. In the case of wooden floors, such as plywood, a joist is provided under the leg attachment position. The hexagon tapping screw has higher pull out capacity than wood screws and coach bolts.

Removable chair fixing

KOTOBUKI offers sulution to neatly cover fixing when removable chairs are not in use.

To enjoy the show comfortably it is essential that good sight lines are secured. If there are seats with poor sight lines, the viewing point may be improved by raising the tier height or by shifting the seats layout to be staggered. It is essential to secure the sight lines at the earliest stage of seating layout and tiers arrangement. Calculation is the simplest method to check the basic sight values on the section tiers. Two-dimensional check with the drawing is useful for quick understanding. Three-dimensional rendering by computer graphics may be used more detailed study of visual fields.

To enjoy the show comfortably it is essential that good sight lines are secured. If there are seats with poor sight lines, the viewing point may be improved by raising the tier height or by shifting the seats layout to be staggered. It is essential to secure the sight lines at the earliest stage of seating layout and tiers arrangement. Calculation is the simplest method to check the basic sight values on the section tiers. Two-dimensional check with the drawing is useful for quick understanding. Three-dimensional rendering by computer graphics may be used more detailed study of visual fields.

Based on the venuse's cross sectional drawing the 'c' values are calculated, as shown in the drawing above, to ensure that the best sight lines are achieved.

Required data for calculating sight lines
A. Height of focal point from stage floor
B. Height of stage from floor
'C' value
D. Height from floor to eye level
E. Height from floor to the level of seating
F. Row rise
G. Depth of focal point from stage front
H. Distance from stage to back of first row
K. Chair layout space

The arrangement of linked chairs at theaters, halls and assembly halls are regulated by safety laws and fi re regulations. The example below is from Tokyo ordinance. The seat centers shall be 420mm or more. The row depth shall be 800mm or more and the horizontal projection distance of the rearmost part of the seat in front and the frontmost part of the seat behind shall be 350mm or more. If there are more than eight seats, the row aisle shall be widened in the ratio of 10mm per seat with a horizontal projection distance of 350mm. The maximum number of seats shall be twenty seats between vertical aisles. In the case of (n) seats: 350mm + 10 x (n-8) mm In the case of the longitudinal aisle, the space shall be 800mm or more (600mm or more in the case of a one-sided aisle), and the width shall be calculated according to the estimated number of evacuating persons through there. Number of persons x 6mm to be secured In the case of the lateral aisle, the space shall be 1,000mm or more and the width shall be calculated according to the estimated number of evacuating persons through there. Number of persons x 6mm to be secured

Fixed seat above Automatic seat below

A hall must have reverberation time that is suited to its purpose. Reverberation refers to the phenomenon whereby, after a sound source ceases, the refl ection of sound exponentially and smoothly fades away. "Reverberation time" is a defined amount of time used to express the length of reverberation. Suitable reverberation time difers depending on the purpose and size of the hall. In the example of a typical hall, the horizontal axis shows the hall's capacity and the vertical axis shows optimum reverberation time at 500Hz. However, these values are only intended to be a guide. Each hall must be designed with consideration given to various conditions.

The fact that all curves rise to the right indicates that, even among halls having the same purpose, longer reverberation time is desirable for larger hall capacity. Even among concert halls, small- and medium-sized halls for chamber music have shorter reverberation times compared to large halls that are primarily designed for symphonies.

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• Reverberation times have varying frequencies. In general, concert halls should have slightly longer reverberation times in the bass range than in the middle and upper ranges. In order to achieve this eff ect, it is important to consider the sound-absorbing qualities that are frequency characteristics of decorating materials and building structures as well as the sound-absorbing qualities of the seats.

Seating area is reasonably large and usually well considered in designing the room acoustics. Mainly the diff erence of sound absorption affects the sound reverberation time of the room. Then the chairs should be selected adequately for the required acoustic performance.

Classical music halls

Less sound absorption for longer reverberation

Conference halls / Theatres

Medium sound absorption for clarity of speech

Cinemas

Maximum sound absorption for optimum sound eff ects