GB/T 39223.6-2020.Ergonomic requirements for healthy home-Part 6: Sofa.
1 Scope
This part of GB/T 39223 specifies the ergonomic technical requirements and test methods for sofas.
GB/T 39223.6 applies to sofas with backrests that are mainly used for sitting activities and meet basic performance quality and safety and environmental protection standards.
2 Normative references
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, its latest version (including all amendments) applies to this document.
GB/T 10000 Chinese adult human body dimensions
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Sofa
A seat made of wood, metal or other rigid materials as the main frame, and covered with elastic materials or other soft materials.
[QB/T 1952.1-2012, definition 3.1]
3.2
reference plane for seat surface
The horizontal plane where the lowest edge of the seat surface is located.
See Figure 1.
3.3
width of seat
The narrowest part of the seat surface inside the armrest of the sofa. If there is no armrest, it is the narrowest part of the seat surface.
See Figure 2.
3.4
?? depth of seat
The vertical distance from the center point of the front edge of the seat surface of the sofa to the front edge point of the lumbar support surface.
See Figure 1.
3.5
Height of seat
The vertical distance from the reference plane of the sofa seat to the ground.
See Figure 1.
3.6
Support area for lumbar
The contact surface under the sofa backrest used to support the lumbar.
3.7
Angle of seat surface
The angle between the line connecting the center point of the front edge of the seat surface and the center point of the seat surface and the horizontal plane.
Note: Positive value on the horizontal plane and negative value below the horizontal plane.
3.8
Angle of back
The angle between the front surface of the sofa backrest and the reference plane of the seat.
See Figure 1.
3.9
Body pressure distribution of seat surface
Pressure distribution between the seat surface of the sofa and the contact surface with the human body.
This part specifies the ergonomic technical requirements and test methods for sofas. This part is applicable to sofas with backrests that are mainly used for sitting activities and meet the basic performance quality and safety and environmental protection standards.

ICS13.180
National Standard of the People's Republic of China
GB/T39223.6—2020
Ergonomic requirements for healthy home-Part 6www.bzxz.net
Sofa
Ergonomic requirements for healthy home-Part 6 :Sofa2020-11-19Release
State Administration for Market Regulation
Standardization Administration of the People's Republic of China
Release
2021-06-01Implementation
Foreword
Introduction
Scope
Normative references
Terms and definitions
Technical requirements
Dimension requirements
Body pressure distribution requirements
Other ergonomic requirements
5 Test methods
Dimension measurement
Body pressure distribution measurement
5.3 Other ergonomic requirements test
Appendix A (Normative Appendix)
Appendix B (Normative Appendix)|| tt||References,
Principles and procedures for tester selection
Sofa user experience table
GB/T39223.6—2020
Foreword
GB/T39223 "Ergonomic requirements for healthy homes" has released the following parts: Part 3: Office desks and chairs;
Part 4: Children's tables and chairs;
———Part 5: Mattresses;
——Part 6: Sofas
This part is Part 6 of GB/T39223
This part was drafted in accordance with the rules given in GB/T1.1-2009. This part was proposed and managed by the National Technical Committee for Ergonomics Standardization (SAC/TC7). GB/T39223.6—2020
The drafting organizations of this part are: China National Institute of Standardization, Shenzhen Zuoyou Furniture Co., Ltd., Zhongbiao Hexin (Beijing) Certification Co., Ltd., Anji County Shengxin Office Furniture Co., Ltd., Zhejiang Botai Furniture Co., Ltd., Xilinmen Furniture Co., Ltd., Beijing Century Jingtai Furniture Co., Ltd., Zhengzhou University, Nanjing Forestry University, Yiliya (Xiamen) Ecological Development Co., Ltd., Foshan Meishen Industrial Development Co., Ltd., Beijing Union University, Beijing University of Aeronautics and Astronautics. The main drafters of this part are: Hu Huimin, Luo Ling, Zhao Chaoyi, Ran Linghua, Zhang Xin, He Shengping, Liu Xiaobo, Sun Xiaofeng, Zhu Yu, Zhou Ao, Jin Chenyang, Wu Haimei, Wang Rui, Chen Yulin, Zhou Xin, Duan Pengzheng, Chen Weilong, Lv Wenwu, Cai Mengjing, Li Yinxia, ??Hong Pu, Yu Na, Guo Jiahong, Zhang Kongcheng, Yang Aiping, Du Junmin.
GB/T39223.6—2020
Introduction
A healthy home is an overall home environment that meets the health and comfort requirements of the three aspects of physiology, psychology, and society, including furniture, home appliances and other household products, lighting environment, thermal environment, sound environment, odor environment and other related physical environment systems, as well as other related auxiliary support systems. A healthy home must not only meet the basic product performance quality and safety and environmental protection requirements, but also meet the ergonomic requirements of convenient operation, comfortable use and good experience. With the development of my country's economy and scientific and technological progress, in addition to the quality performance and safety and environmental protection of the product itself, people have put forward higher requirements for the humanization and user experience level of the product. Ergonomics aims to design and improve the product and environment system according to the physiological and psychological characteristics of people, achieve the best match between the human-product-environment system, and ultimately achieve the humanization of the product and environment system, creating safe, healthy, comfortable and efficient working and living conditions for people. Products that meet the requirements of ergonomics can effectively improve the comfort and use quality of the product and improve the user experience level. Therefore, in addition to meeting the basic performance quality and environmental safety standards of the product, the ergonomic requirements that reflect the humanized design and user experience level of the product have also become a necessary indicator for judging healthy homes. The sofas we use in our daily lives and work are of various types and styles. Whether it is function or appearance, they are constantly meeting the needs of people's daily lives and work. The evolution of sofas is also a process of people's continuous pursuit of comfort. Therefore, the study of sofa comfort is the application and development of our research on sitting comfort, and it is also an inevitable requirement to meet human pursuit of life comfort and happiness experience. Sofas are one of the main furniture products in modern living rooms, reception areas, and meeting areas of office spaces. Their ergonomic performance has an important impact on the safety, health and comfort of users. However, in daily life, sofas, as a symbol of comfort, often make people feel uncomfortable due to improper design. Therefore, modern design increasingly emphasizes the combination of sofa design and ergonomics. If the size of the sofa is unreasonable, the human body's muscles will be overly tense and fatigued, and the sofa soft seat will not have the effect it should have. Therefore, a good sofa design can reduce people's fatigue, make people healthy and happy. And a good sofa design benefits from the correct use of ergonomic principles. Therefore, it is necessary to specify the technical requirements and evaluation methods of sofas that meet the physiological and psychological characteristics of the human body according to the principles of ergonomics, so as to provide reference and basis for improving the quality and comfort experience of sofas. V
1 Scope
Ergonomic requirements for healthy homes
Part 6: Sofas
This part of GB/T39223 specifies the ergonomic technical requirements and test methods for sofas GB/T39223.6—2020
This part applies to backrest sofas that meet basic performance quality and safety and environmental protection standards and are mainly used for sitting activities. Normative references
The following documents are essential for the application of this document. For all references with a date, only the version with a date applies to this document. For all undated references, the latest version (including all amendments) applies to this document GB/T10000 Human dimensions of Chinese adults
3 Terms and definitions
The following terms and definitions apply to this document. 3.1
sofa
Sofa
A seat made of wood, metal or other rigid materials as the main frame, and covered with elastic materials or other soft materials on the surface. [QB/T1952.1—2012, definition 3.1]
reference plane for seat surface
The horizontal plane where the lowest edge of the seat surface is located.
See Figure 1.
GB/T39223.6—2020
Explanation:
reference plane for seat surface;
seat height;
seat depth;
backrest inclination angle;
lower contact point;
upper contact point.
widthof seat
Seat width
Figure 1 Schematic diagram of sofa seat
The narrowest part of the seat inside the armrest of the sofa. If there is no armrest, it is the narrowest part of the seat. See Figure 2.
Explanation:
B——Seat width.
Figure 2
Seat depth
depthof seat
Seat width schematic diagram
-LCP
The distance from the center point of the front edge of the sofa seat to the vertical plane where the front edge point of the lumbar support surface is located. See Figure 1.
Seat heightheightof seat
The vertical distance from the reference plane of the sofa seat to the ground is shown in Figure 1.
supportareaforlumbar
Lumbar support surface
The contact surface under the sofa backrest for supporting the lumbar. Angle of seat surface
Angle between the line connecting the front center of the seat surface and the center of the seat surface and the horizontal plane. Note: Positive values ??are on the horizontal plane and negative values ??are below the horizontal plane. Angle of back
Angle of backrest
The angle between the front surface of the sofa backrest and the seat reference plane is shown in Figure 1.
Body pressure distribution of seat surface
Pressure distribution between the seat surface of the sofa and the contact surface of the human body. 3.10
User experience
User experience
People's feelings and reactions to the products, systems or services they use or expect to use GB/T39223.6—2020
Note 1: User experience includes all emotional reactions, trust reactions, preference reactions, sensory reactions, physiological and psychological reactions, as well as behaviors and performance of users before, during and after use.
Note 2: User experience is the result of the combined effects of the brand image, appearance characteristics, functional characteristics, system performance, interactive behavior and auxiliary functions of the interactive system, the internal psychological and physiological state formed by the user's previous experience, attitude, skills and personality characteristics, and the use scenario. Note 3: From the perspective of achieving personal goals of users, usability may include the perceptual and emotional aspects that are very relevant to user experience. Usability standards can be used to evaluate all aspects of user experience. [ISO9241-210:2019, definition 3.15]
Technical requirements
4.1 Dimension requirements
4.1.1 Seat width
The seat width B (see Figure 2) of a single sofa should not be less than 450mm, the seat width of a double sofa should not be less than 990mm, and the seat width of a sofa with more than three people should not be less than 1530mm.
4.1.2 Seat depth
The seat depth T (see Figure 1) should be between 480mm and 580mm. 4.1.3 Seat height
When the seat surface is subjected to the load of the 50th percentile male weight (see GB/T10000), the seat height H, (see Figure 1) should be within 370mm and 440mm.
GB/T39223.6—2020
4.1.4 Sofa backrest
The lumbar support of the sofa should meet the following requirements: a)
The sofa backrest should have a lumbar support surface. When the sofa is subjected to the load of the 50th percentile male weight (see GB/T10000), there should be a support surface within 170mm to 250mm above the seat reference surface. The distance from the front edge of the lumbar contact surface of the backrest to the seat reference surface should be no less than 210mm. b)
c)
The distance from the front edge of the lumbar support surface to the backrest reference axis should be between 10mm and 50mm. The sofa backrest reference axis is the line connecting the upper contact point UCP and the lower contact point LCP in Figure 1 on the midline of the sofa backrest. Among them, the upper contact point is the contact point between the thoracic kyphosis of the spine and the backrest when a person sits on the seat, that is, the midline of the backrest is 460mm above the seat reference plane. If the upper edge of the backrest is greater than 460mm from the seat reference plane, the rear edge of the concave contact surface above the backrest is called the upper contact point. The lower contact point is the starting position of the sacrum plate when the human body sits on the seat, that is, the midline of the backrest is 110mm above the seat reference plane. If the lower edge of the backrest is greater than 110mm from the seat reference plane, the lower edge of the backrest is called the lower contact point. 4.1.5 Armrests
The height of the armrests at half the seat depth (see Figure 3) should be between 150mm and 300mm. 7777
Description:
G—Armrest height.
Figure 3 Schematic diagram of armrest height
4.1.6 Seat surface inclination
When the seat surface bears the load of the 50th percentile male weight (see GB/T10000), the seat surface inclination should be between 2° and 15°. 4.1.7 Backrest inclination
The backrest inclination angle β (see Figure 1) should be between 100° and 120°. 2 Body pressure distribution requirements
The maximum pressure in the area of ??the ischial tuberosity of the sofa seat surface corresponding to the human body should not be greater than 20kPa. 4.3 Other ergonomic requirements
4.3.1 Contact surface hardness
The contact surface of the sofa should have appropriate hardness to provide users with good contact pressure comfort and support. 4
Example: The contact surface of the sofa includes the sofa seat, backrest, armrests and other surfaces that are in direct contact with people. 4.3.2 Contact surface touch
GB/T39223.6—2020
The material, material temperature, contact surface texture, shape design, etc. of the sofa should give users a good touch, and should not have a rough feeling that makes users feel uncomfortable, nor should there be obvious cold and hot stimulation. 4.3.3 Structural shape
The functional structure of the sofa used to support specific parts of the human body should be comfortable and effective, so that users have a good comfortable experience. Example: The functional structure of specific parts such as the shape and inclination of the armrests. 4.3.4 Appearance safety
The inner and outer surfaces of the sofa should not have sharp edges, hard burrs, sharp points, and other appearance structures that may cause accidental injuries. 4.3.5 Sound
The sofa should not produce noise that offends the user during use. 4.3.6 Smell
There should be no odor that makes the user feel obviously uncomfortable. 5 Testing methods
5.1 Dimension measurement
5.1.1 Seat height
Use the 50th percentile male weight (see GB/T10000) load module to apply load on the seat surface, and measure the vertical distance between the lower surface of the module and the ground with a measuring device with an accuracy of not less than 1mm. The contact part of the load module used with the seat surface should conform to the shape of the human buttocks, with a mass error of no more than ±0.5kg, and the mass distribution should be similar to the characteristics of the human body. 5.1.2 Armrest height
Use a measuring device with an accuracy of not less than 1mm to measure the height of the armrest at half the seat depth. 5.1.3 Seat inclination angle
Use the 50th percentile male weight (see GB/T10000) load module to press the seat surface to the maximum inclination position, and use an inclinometer with an accuracy of not less than 1° to measure the angle between the lower surface of the module and the horizontal plane. 5.1.4 Backrest inclination angle
Use an inclinometer with an accuracy of not less than 1 to measure. 5.1.5 Other dimensions
Use a measuring device with an accuracy of not less than 1mm to measure the seat width, seat depth and backrest dimensions. 5.2 Body pressure distribution measurement
Use a pressure distribution measurement system with an accuracy of not less than 0.1kPa for testing. Select height and body mass index (BMI) between 20 and 25 SAG7 Backrest inclination angle
The backrest inclination angle β (see Figure 1) should be between 100° and 120°. 2 Body pressure distribution requirements
The maximum pressure in the area of ??the ischial tuberosity of the human body corresponding to the sofa seat surface should not be greater than 20kPa. 4.3 Other ergonomic requirements
4.3.1 Contact surface hardness
The contact surface of the sofa should have appropriate hardness to provide users with good contact pressure comfort and support. 4
Example: The contact surface of the sofa includes the sofa seat surface, backrest, armrests and other surfaces that are in direct contact with people. 4.3.2 Contact surface touch
GB/T39223.6—2020
The material, material temperature, contact surface texture, shape design, etc. of the sofa should give users a good touch, and should not have a rough feeling that makes users feel uncomfortable, nor should there be obvious cold and hot stimulation. 4.3.3 Structural shape
The functional structure of the sofa used to support specific parts of the human body should be comfortable and effective, so that users have a good comfortable experience. Example: The functional structure of specific parts such as the shape and inclination of the armrests. 4.3.4 Appearance safety
The inner and outer surfaces of the sofa should not have sharp edges, hard burrs, sharp points, and other appearance and structural shapes that are easy to cause accidental injuries. 4.3.5 Sound
The sofa should not produce noise that makes users feel disgusted during use. 4.3.6 Odor
There should be no odor that makes users feel obviously uncomfortable. 5 Testing method
5.1 Dimension measurement
5.1.1 Seat height
Use the 50th percentile male weight (see GB/T10000) load module to apply load on the seat surface, and the measuring equipment with an accuracy of not less than 1mm measures the vertical distance between the lower surface of the module and the ground at this time. The contact part between the load module and the seat surface should conform to the shape of the human buttocks. The mass error should not exceed ±0.5kg, and the mass distribution should be similar to the characteristics of the human body. 5.1.2 Armrest height
Use a measuring device with an accuracy of not less than 1mm to measure the height of the armrest at half the seat depth. 5.1.3 Seat surface inclination
Use the 50th percentile male weight (see GB/T10000) load module to press the seat surface to the maximum inclination position, and use an inclinometer with an accuracy of not less than 1° to measure the angle between the lower surface of the module and the horizontal plane. 5.1.4 Backrest inclination
Use an inclinometer with an accuracy of not less than 1 to measure. 5.1.5 Other dimensions
Use a measuring device with an accuracy of not less than 1mm to measure the seat width, seat depth and backrest dimensions. 5.2 Body pressure distribution measurement
Use a pressure distribution measurement system with an accuracy of not less than 0.1kPa for testing. Select height and body mass index (BMI) between 20 and 25 SAG7 Backrest inclination angle
The backrest inclination angle β (see Figure 1) should be between 100° and 120°. 2 Body pressure distribution requirements
The maximum pressure in the area of ??the ischial tuberosity of the human body corresponding to the sofa seat surface should not be greater than 20kPa. 4.3 Other ergonomic requirements
4.3.1 Contact surface hardness
The contact surface of the sofa should have appropriate hardness to provide users with good contact pressure comfort and support. 4
Example: The contact surface of the sofa includes the sofa seat surface, backrest, armrests and other surfaces that are in direct contact with people. 4.3.2 Contact surface touch
GB/T39223.6—2020
The material, material temperature, contact surface texture, shape design, etc. of the sofa should give users a good touch, and should not have a rough feeling that makes users feel uncomfortable, nor should there be obvious cold and hot stimulation. 4.3.3 Structural shape
The functional structure of the sofa used to support specific parts of the human body should be comfortable and effective, so that users have a good comfortable experience. Example: The functional structure of specific parts such as the shape and inclination of the armrests. 4.3.4 Appearance safety
The inner and outer surfaces of the sofa should not have sharp edges, hard burrs, sharp points, and other appearance and structural shapes that are easy to cause accidental injuries. 4.3.5 Sound
The sofa should not produce noise that makes users feel disgusted during use. 4.3.6 Odor
There should be no odor that makes users feel obviously uncomfortable. 5 Testing method
5.1 Dimension measurement
5.1.1 Seat height
Use the 50th percentile male weight (see GB/T10000) load module to apply load on the seat surface, and the measuring equipment with an accuracy of not less than 1mm measures the vertical distance between the lower surface of the module and the ground at this time. The contact part between the load module and the seat surface should conform to the shape of the human buttocks. The mass error should not exceed ±0.5kg, and the mass distribution should be similar to the characteristics of the human body. 5.1.2 Armrest height
Use a measuring device with an accuracy of not less than 1mm to measure the height of the armrest at half the seat depth. 5.1.3 Seat surface inclination
Use the 50th percentile male weight (see GB/T10000) load module to press the seat surface to the maximum inclination position, and use an inclinometer with an accuracy of not less than 1° to measure the angle between the lower surface of the module and the horizontal plane. 5.1.4 Backrest inclination
Use an inclinometer with an accuracy of not less than 1 to measure. 5.1.5 Other dimensions
Use a measuring device with an accuracy of not less than 1mm to measure the seat width, seat depth and backrest dimensions. 5.2 Body pressure distribution measurement
Use a pressure distribution measurement system with an accuracy of not less than 0.1kPa for testing. Select height and body mass index (BMI) between 20 and 25 SAG
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