Computer chair ergonomic design ideas With the increasing number of young people suffering from sub-health conditions and spending longer hours at work, sedentary lifestyles have become a major concern for people’s health. In response to this situation, ergonomic computer chairs have been developed. Let’s delve into the sources of their design concepts based on research into human sitting dimensions.
The design of ergonomic computer chairs is rooted in a thorough understanding and application of human engineering principles, incorporating innovative design elements and eco-friendly concepts to provide users with a more comfortable, healthy, and environmentally friendly sitting experience.
According to the research on human sitting dimensions:
1.Seat Height: Typically ranging from 450-550mm for office chairs. The design basis is based on the 5th percentile value of the sum of calf length and foot height. The front edge of the seat should be 30-50mm lower than the height of the knee pit, with a radius of 25-50mm for better comfort. The seat height should be neither too high nor too low. H = Calf popliteal height + shoe thickness (20-40mm) – appropriate clearance (10-20mm).
2.Seat Height: Typically ranging from 450-550mm for office chairs. The design basis is based on the 5th percentile value of the sum of calf length and foot height. The front edge of the seat should be 30-50mm lower than the height of the knee pit, with a radius of 25-50mm for better comfort. The seat height should be neither too high nor too low. H = Calf popliteal height + shoe thickness (20-40mm) – appropriate clearance (10-20mm).
3.Seat Width: Generally greater than 380mm, with armchairs not less than 460mm. For lounges and other resting chairs, the width is greater than 480mm, typically ranging from 520-560mm. B = Shoulder width + winter clothing thickness + movement allowance.
Seat Depth: National standards specify 400-440mm, while for lounges and other resting chairs, the depth can be larger, ranging from 480-600mm. The design is based on the 5th percentile value of seated thigh length minus 60mm for clearance. T = Seated thigh length – 60mm (clearance).
4.Seat and Backrest Angle: The angle between the seat (or backrest) and the horizontal plane. For resting chairs, it is generally 19°–20° (seat) and 98°–112° (backrest). For work chairs, where users tend to lean forward, the angle should not be too large, typically 4°–6° (seat) and 95°–100° (backrest).
5.Backrest Height: Ideally, it should reach below the lower edge of the scapula. A lumbar support cushion is recommended, with a height of 250mm being optimal. The position of the lumbar support varies with the backrest angle.
6.Armrest Height: The distance from the top edge of the armrest to the seat surface. Its primary function is to support the weight of the arms, reducing shoulder strain. The typical height is 200-300mm above the effective thickness of the seat cushion.
7.Seat Cushion: When seated, approximately 75% of a person’s weight is supported by an area around the ischial tuberosities, covering approximately 25cm². Prolonged sitting can cause pressure fatigue, leading to pain and numbness in the buttocks. Adding a moderately soft and firm seat cushion can increase the contact area, distributing pressure more evenly.
From the above points, it is evident that the design inspiration for ergonomic computer chairs stems from a profound understanding and application of human engineering principles, coupled with innovative design elements and eco-friendly concepts, aimed at providing users with a more comfortable, healthy, and environmentally friendly sitting experience.
