The size of the chair in mahogany furniture is somewhat elegant. Generally, the sitting posture of the human body can be roughly divided into three types: sitting forward, sitting straight, and leaning back. Therefore, the chair structure of mahogany furniture is designed according to the sitting posture of the human body. The small series of O'Brien furniture has learned that the mahogany furniture chair has the following characteristics.
First, the standard size of the chair - sitting high
Sitting height refers to the vertical distance from the seat to the ground. Since the seat surface is often inclined backwards, the seat height of the chair is usually the height of the seat as the seat height; if the seat surface is inclined backward or concave, the seat height is the vertical distance from the center of the front seat to the ground.Appropriate seating height: Keep the thighs level, the calves vertical, and the feet flat on the ground. If the seat height is too high, the two legs will vacate the thigh blood vessels; too low will cause physical fatigue. Practice has proved that the appropriate seat height is the calf height to the sole height plus the heel thickness of 25mm-35mm, and then the activity margin of 10mm-20mm is subtracted. which is:
Sitting height = calf height + heel thickness - appropriate gap National standard GB 3326-1997 specifies: sitting height is 400mm-440mm, size difference is 10mm.
Second, the standard size of the chair - sitting deep is the distance from the front to the back of the chair, the depth of the sitting depth has a great impact on the comfort of the sitting posture. If the chair is deeper than the horizontal length of the thigh, the backrest of the human body will have a large inclination, and the waist will lack the support point and hang, which will increase the muscle activity of the waist and cause fatigue; at the same time, the sitting surface is too deep, so that the knee is at the knee Produces numbness and is also not conducive to standing up.
The average length of the thigh in the sitting posture of our country is 445mm for men and 425mm for women. Then we ensure that there is a certain distance (about 60mm) from the inside of the knee when sitting in front of the knee. In general, the sitting depth is between 380mm and 420mm.
Third, the standard size of the chair - sitting width The width of the chair sitting surface according to the person's sitting posture and movement, tends to be front wide and narrow shape, the front edge width of the sitting surface is called the front width, the back edge width is called the back width. The seat width is generally not less than 380mm. For a chair with armrests, it is necessary to consider the support of the human arm. The inner width of the armrest is used as the seat width, and an appropriate margin is added according to the average shoulder width of the human body. Not less than 460mm, but not too wide, should be based on the comfortable shoulder width of the natural vertical arm.
Fourth, the standard size of the chair - the inclination of the sitting surface When the person is resting, the sitting posture is leaning backwards to support the lumbar vertebrae, so most of the general sitting faces are designed to be inclined backwards. The inclination of the seat surface is generally 3 to 5 degrees, and the opposite seat back is also inclined backward.
V. Standard size of the chair—The height of the backrest is mainly related to the height from the bottom of the buttocks to the shoulders (determining the height of the backrest) and the width of the shoulders (determining the width of the backrest). The height and width of the backrest of the chair, the maximum height of the backrest can reach 480mm~630mm, and the maximum width can reach 350mm~480mm.
Sixth, the standard size of the chair - the height of the armrests Opel furniture indicates that the height of the handrail should be close to the vertical distance of the lower part of the elbow when the human ischial node is naturally drooping. Practice has proved that the vertical distance from the upper surface of the armrest to the seat surface is preferably 200mm-250mm. 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 angle of the backrest, the inclination of the handrail is generally 10 degrees-20 degrees, and the handrail is preferably within 10 degrees of the horizontal left and right angle side.
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