Traditional Culture Encyclopedia - Hotel accommodation - What is the standard size of the chair?

What is the standard size of the chair?

First, the seat height of the chair size standard

The seat height refers to the vertical distance from the seat surface to the ground; If the seat surface is backward inclined or concave arc, the seat height refers to the vertical distance from the center of the front edge of the seat to the ground. If the seat height is too high, the legs will be suspended and the thigh blood vessels will be compressed; Too low will cause physical fatigue. Practice has proved that the appropriate seat height is the height from the calf fossa to the sole plus the heel thickness of 25-35mm, and then minus the movement allowance of 1-2mm. That is:

seat height H = calf socket height+heel thickness-appropriate clearance

National standard GB 3326-1997 stipulates that the seat height h is 4-44mm and the size difference is 1mm. The maximum height of the soft seat surface is 46mm (excluding the subsidence of the seat surface). The height of the sofa seat can be lower, so that the legs extend forward and lean back, which is beneficial to the natural state of the spine. The height of a sofa is generally 36-42mm.

Second, the seat inclination angle and back inclination angle of the chair size standard

The included angle between the seat surface and the horizontal plane is called the seat inclination angle α; The included angle between the backrest and the horizontal plane is called the back oblique angle β.

The national standard GB 3326-1997 stipulates that the seat inclination angle α is 1-4 degrees (armchairs and armchairs) or 3-6 degrees (folding chairs), and the angle difference is 1 degree; The back inclination angle β is 95-1 degrees (armchairs and armchairs) or 1-11 degrees (folding chairs), and the angle difference is 1 degree. For sofas, α is 3-6 degrees and β is 98-112 degrees; The recliner is bigger.

third, the seat depth of the chair size standard

the seat depth refers to the distance from the front edge to the back edge of the seat. Too deep and too shallow will make the calf and back tired and uncomfortable. Practice has proved that the seat depth should be slightly smaller than the horizontal length of thighs when sitting. That is:

the seat depth T= the horizontal length of sitting thigh is over 6mm (gap)

The national standard GB 3326-1997 stipulates that the seat depth t is 34-42mm (armchair), or 4-44mm (folding chair), and the size difference is 1mm. Sofa and other leisure seating can be slightly deeper, 48-56mm, because the backrest is inclined.

Fourth, the seat width of the chair size standard

The seat width should enable the arm to be fully supported and leave room. For an armchair, the inner width of the armrest is the seat width, which is generally determined by the average shoulder width of a person plus an appropriate margin. That is,

the inner width of the handrail front edge B= the shoulder width of human body+the thickness of winter clothes+the activity allowance

the national standard GB 3326-1997 stipulates that the front width b of armchair or folding chair seat is greater than or equal to 38mm, and the size difference is 1mm;; The inner width b of the handrail front edge is greater than or equal to 46mm, and the size difference is 1 mm.

5. Height of backrest of chair size standard

The minimum height of backrest of chair can be set at the first and second lumbar vertebrae (working chair), and the length can be gradually increased, and the maximum length can reach the scapula and neck (leisure chair), while the length of backrest can be required to support the head (leisure chair) in static rest. Practice has proved that the best supporting point of backrest is about 25 mm.

the national standard GB 3326-1997 stipulates that the backrest height l is greater than or equal to 275mm, and the size difference is 1mm.

Sixth, the height of the armrest of the chair size standard

The height of the armrest should be close to the vertical distance from the point of the human ischial tubercle to the lower end of the elbow when it naturally droops. Practice has proved that the vertical distance from the upper surface of the handrail to the seat surface is 2-25 mm. At the same time, the front end of the handrail should be slightly higher. With the change of the inclination angle of the seat surface and the inclination angle of the backrest, the gradient of the handrail is generally 1-2 degrees, while the gradient of the handrail at the horizontal left and right deviation angles is 1.