one, seat chair of high standard size
The height of the seat refers to the vertical distance from the seat to the ground; if the seat is backward or concave, the height of the seat refers to the vertical distance from the center point of the seat to the ground. Seat height is too high, it will oppress the thigh dangling his legs vascular; too low will cause physical fatigue. It has been proved that the suitable height of the seat is the heel of the crank to the foot and the heel of 25-35mm, and then the activity allowance of 10-20mm is reduced. That is:
Seat height H = calf height + heel thickness - appropriate gap
The national standard GB 3326-1997 stipulates that the seat height H is 400-440mm and the size difference is 10mm. The maximum height of the seat is 460mm (the seat surface subsidence is not included). The height of the sofa seat can be lower, extending the leg forward and leaning against the back, which is beneficial to the natural state of the spine. The seat height of the sofa is generally 360-420mm.
Two, the seat chair size standard angle and back angle
The angle between the plane and the horizontal plane is called the dip angle alpha, and the angle between the back and the horizontal plane is called the back angle beta.
The national standard GB 3326-1997 seat angle is 1-4 degrees (couches and armchairs), or 3-6 degrees (folding), differential angle of 1 degrees; back inclination angle is 95-100 degrees (couches and armchairs), or 100-110 degrees (1 chairs), angle difference degree. For the sofa, the alpha is 3-6 degrees, the beta is 98-112 degrees, and the reclining chair is bigger.
Three, the size of the standard seat chair
The depth of the seat refers to the distance from the seat to the back. It is too deep and too shallow to make the legs and back fatigue discomfort. The practice has proved that the depth of the seat is slightly less than the horizontal length of the thigh when it is less than sitting position. That is:
The horizontal length of the thigh of a seat deep T= is over 60mm (GAP)
The national standard GB 3326-1997 T 340-420mm (deep provisions seat chair), or 400-440mm (chair), or 340-420mm (chairs), the size difference was 10mm. The sofa and other leisure seats are relatively large because of the backrest, so the seat depth can be slightly larger, which is 480-560mm.
Four, the size of the standard chair seat width
Seat width should be able to make the arm fully supported and is appropriate for the armchair, the armrest seat width is wide, with the general average shoulder size people with appropriate allowance and. That is:
In front armrest width B= + clothes + human shoulder thickness allowance activities
The national standard GB 3326-1997 armchair or folding seat front width B is greater than or equal to 380mm, the size difference was 10mm; in the front armrest width of B is greater than or equal to 460mm, the size difference is 10mm.
Five, the size of the chair backrest height standard
The chair backrest height can be set at first, second the lowest root at the lumbar spine (work chair), and gradually increase the maximum length, scapula, neck (chair), while the static rest back to support the head length requirements (chair). It is proved that the best supporting point of the backrest is about 250mm.
The national standard GB 3326-1997 stipulates that the height of the backrest is L greater than or equal to 275mm, and the size difference is 10mm.
Six, the size of the standard arm chair height
The height of the armrest should be close to the vertical distance between the nodular point of the body of the body and the bottom of the elbow at the time of natural drooping. It is proved by practice that the vertical distance from the upper surface of the armrest to the seat is 200-250mm. At the same time, the front end of the handrail should also be slightly higher. With the change of the seat angle and backrest angle, the general grade difference of the handrails is 10-20 degrees, while the handrail's deviation is 10 within the horizontal angle.
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