What kind of chair is the most comfortable? When the chair is designed to be ergonomically possible, the chair is most comfortable. So how do we design chairs based on ergonomics? Today bring you the standard size effect map of the chair, through these size effect map for you to explain in detail what the standard size of the chair is?
Want to know which chair is most comfortable? Let’s get to know people’s sitting habits first. A person’s sitting posture can be divided into three kinds: sitting forward, sitting straight, leaning back. The position of sitting forward is mainly the posture of work, and the position of rest and relaxation is the position of rest and relaxation. When a person sits forward, the human pelvis rotates into a tilted state, the tiry also does the corresponding movement, and tends to level, so that the titch has and lumbar vertebrae flattened, causing the spine above the waist to become a ridge back convex, looks like a hunchback;
By analyzing the physiological characteristics of a person sitting in a position, we can use these characteristics to derive the most comfortable design size of the chair:
First, the standard size of the chair seat height
Seat height refers to the vertical distance from the seat face to the ground, and if the seat is tilted back or curved, the seat height refers to the vertical distance from the center point of the front of the seat to the ground. If the seat is too high, the suspension of the legs will compress the blood vessels in the thighs; Practice has proved that the appropriate seat height for the calf nest to the foot height plus 25-35mm heel thickness, minus 10-20mm of activity. That is:
Seat height H – calf nest height – heel thickness – appropriate clearance
National standard GB3326-1997 stipulates: seat height H is 400-440mm, size difference of 10mm. The maximum height of the soft seat face is 460mm (does not include the sinking of the seat face). Sofa seat height can be lower, so that the legs stretch forward, lean back, conducive to the spine in a natural state. The seat height of the sofa is generally 360-420mm.
Second, the standard size of the chair seat inclination, back inclination
The angle between the seat face and the horizontal surface is called the seat α, and the angle between the back and the horizontal surface is called the β.
The national standard GB3326-1997 provides for seat inclinations α 1-4 degrees (back chairs and armchairs), or 3-6 degrees (folding chairs), with an angle difference of 1 degree, and back inclinations β 95-100 degrees (backchairs and armchairs), or 100-110 degrees (folding chairs), with an angle difference of 1 degree. For sofas, α is 3-6 degrees, β is 98-112 degrees, and the sun loungers are larger.
Third, the standard size of the chair seat depth
Seat depth refers to the distance from the front of the seat to the rear edge. Too deep and too shallow, will make the calves and back fatigue uncomfortable. Practice has proved that the seat depth is slightly less than the horizontal length of the thigh when sitting. That is:
Seat depth T – sitting position thigh horizontal length of more than 60mm (gap).
The national standard GB3326-1997 specifies a seat depth of 340-420mm (back chair), or 400-440mm (armchair), or 340-420mm (folding chair), with a size difference of 10mm. Sofas and other leisure seats because of the larger back slope, so the seat depth can be slightly larger, 480-560mm.
Fourth, the standard size of the chair seat width
Seat width should enable the arm to be fully supported and leave room for appropriate, for armchairs, the armrest width is seat width, generally based on the average shoulder width size of a person plus the appropriate balance. That is:
The width of the armrest front is B, the width of the human shoulder, the thickness of the winter coat, and the amount of activity
National standard GB3326-1997 stipulates that the armchair or folding chair front width B is greater than or equal to 380mm, the size difference is 10mm, the armchair front width B is greater than or equal to 460mm, the size difference is 10mm.
- The height of the backrest of the standard size of the chair
The back height of the chair can be set at the lowest lumbar vertebrae (work chair), and can gradually increase in length, up to the shoulder blade, neck (leisure chair), while static rest can require the length of the backrest can support the head (leisure chair).
Practice has proved that the best support point for the back is about 250mm. National standard GB3326-1997 provides that the back-to-back height L is greater than or equal to 275mm, the size difference is 10mm.
Six, the standard size of the chair armrest height
The height of the armrest should be similar to the vertical distance between the human sequin node and the lower end of the elbow when it naturally droops. It has been proved that the vertical distance from the surface of the armrest to the seat is 200-250mm.
At the same time, the front end of the armrest should also be slightly higher, with the seat angle and back angle changes, the handrail tilt is generally 10-20 degrees, and the armrest in the horizontal left and right angle side level difference is within 10 range is appropriate.
