Swivel chairs consist of seven major components: seat, gas lift, backrest, base plate, casters, five-star base, and armrests. Depending on the usage location and method, chairs generally use either fixed or sliding designs. Chair wheels or fixed bases are connected to chair legs in two ways: threaded and spring ring insert fixed. Sliding chair wheels use different materials to match the chair sliding speed based on floor hardness. Hard floors use soft wheels, while soft floors use hard wheels. The basic function of a chair is to support the user's body during work or rest. Office swivel chairs are required to function in both working and resting states.
       Office workers spend nearly eight hours a day on office chairs, becoming “professional sitters.” Poorly designed chairs not only affect work efficiency but also easily cause fatigue, leading to back pain or spinal problems, and are one of the main causes of back injuries. These diseases accumulate gradually and are not easily detected early.
       In different work environments, adjusting the backrest angle can help users improve their posture to reduce back pressure. Chairs that can adjust the forward tilt angle to accommodate the user's physical activity and provide correct sitting posture can reduce pressure on the user's abdomen.