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Six standards of ergonomic children's chair
Oct 05, 2018

With the development of society, children occupy a central position in the family. However, most of the children's products on the market are not conducive to the growth of children. The concept of children's ergonomics is still very vague, even as long as the desktop can adjust the height and angle is ergonomics.


In fact, the research and development of ergonomics involve many fields, such as basic data analysis of human body, physiological data analysis and calculation, even psychological research and so on, which belong to the scope of ergonomics.


Children's human engineering is relatively more complicated, because children will have very obvious changes with age, physiology and psychology, so design requirements are more scientific and more precise. Therefore, China's first human engineering association invested in children's human engineering research in 2016 and applied the research results to ergonomic children's desks and chairs at the same time "Six Standards for Ergonomic Children's Chair" Concept, set up a standard specification for furniture industry.


I. definition of ergonomics


Ergonomics is the study of anatomical, physiological, psychological and other factors in a certain working environment, the interaction between human beings and machines and the environment, and the study of how work efficiency is taken into account in the course of work, in life and on vacation. The subject of human health, safety, and comfort.


II. Six standards: high standard 1


High standard: To avoid excessive pressure under the thigh, the height of the front of the seat to the ground or foot should not be greater than the distance between the sole and the thigh. According to the study, the appropriate seat height should be equal to the heel height plus 25-35mm heel thickness plus 25-35mm heel thickness minus 10-20mm, that is, the height of the chair seat = heel height + heel thickness-appropriate space.


According to the national standard, the height of the chair seat is high: the height of the seat is 400-0.89mm (height of the seat is 400-0.4mm) is only applicable to the standard of the adults. For this reason, the human engineering application association takes the height/ sitting height of children aged 4-17 years as the research object, and through a lot of data research, investigation and comparison, the most suitable height range of Chinese children is 270 ~ 520mm. thereby meeting the use requirement of children between 4 and 17 years of age.)


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III. Six Standard Test Stand Depth Standards


Block depth standard: The size of the base shall meet the following three conditions:


1. The buttocks are fully supported


2. lumbar support for backrest


3. Leave a proper distance between the front edge of the seat and the lower leg to ensure that the thigh muscle is not squeezed and the lower leg can move freely.


According to the study, the depth of the seat is slightly smaller than the horizontal length of the thigh when sitting in the sitting position, that is, the seat depth = sitting depth-60mm, and the general seating depth = 340-420mm (sitting depth 340-420mm is only applicable to the adult standard. To this end, the Institute of Human Engineering Applied to study the children's sitting depth from 4 to 17 years of age in China, and through a lot of data research, investigation and comparison, it is finally concluded that the best fit for Chinese children is between 180 and 360mm. thereby meeting the use requirement of children between 4 and 17 years of age.)



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IV. Six standard seat surface inclination angle


Angle of inclination of seat surface:


The function of the backward side of the chair:


1. In general, the higher the inclination of the seat surface, the higher the pressure ratio of the seat surface to the backrest.


2. The lower limb muscle force is reduced, and the fatigue degree is reduced.


And 3, preventing the buttocks from slipping out of the seat surface gradually so as to cause the sitting posture stability difference.


The inclined angle of the seat surface of the working chair seat is 0-5 degrees, and the inclination angle of the recommended working chair seat surface is 3-4 degrees.


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V. Design standard for six standard full-height backrest


Dimension standard for backrest:


A. The width of the backrest shall be no more than 325-375mm.


b. The height of the backrest depends on the function of the chair, but the back should not be too high. Usually, the shoulder should be lower than the shoulder blade, about 460 mm. high.


Side contour of the seat: The design of the seat back should be designed to have a certain curvature according to the characteristics of the back of the human body. The chair back is designed to “S” The curve is basically in line with the curvature of the human spine and maintains a backrest inclination of 100 ° ~ 105 °.


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VI. Design standard of six standard seat cushion


Seat Cushion Design Criteria:


The soft stiffness of the seat cushion is desirable because it can increase the contact area between the buttocks and the seat surface, thereby reducing the uneven pressure distribution, but the cushion oversoft produces the following problems, and the height of the general cushion is 25mm.


The surface material of the seat pad shall be made of fibrous material, which is both breathable and capable of reducing the body's decline. Do not use plastic surface, air-tight, surface is too slippery, make people feel uncomfortable


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VII. Design criteria for six standard handrail handrails


Design Criteria for Handrail:


The armrest function: when a person sits on a chair, the arm is naturally placed on the chair, so that the burden of the two arms is reduced, the rest of the upper limb muscles is facilitated, and the comfort is increased. When you get up and stand or change your posture, you can support your body with the armrest; in the swing-jerk state, the armrest can help stabilize your body.





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The benefits of the eight, six criteria for Children


One of the benefits: Ergonomics and mechanics and physiology are a tool for learning.


Benefits bis: Prevent children from stooping and correcting their child's body.


Our company's wooden children's table and chairs are made according to the ergonomic standard, the design is reasonable and the quality is guaranteed.

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