Office Chair Design Parameters
Office chair design parameters cover core parameters, parameters related to design principles, parameters related to the EN 1335 - 1 standard, and other parameters, as detailed below:
Core Parameters: Seat height is a crucial indicator. For office chairs, it typically ranges from 35 to 50 cm. An appropriate seat height allows users to place their feet flat on the ground naturally, with their thighs parallel to the ground. In terms of depth, office chairs are usually 30 to 40 cm deep, ensuring that users can lean their backs naturally against the backrest while avoiding pressure on the back of their knees from the seat edge. Regarding the tilt angle, office chairs should have a backward tilt of less than 5ยฐ, which helps maintain proper sitting posture. The seat shape should conform to the curves of the human buttocks. The backrest height ranges from 46 to 61 cm, providing support to the user's shoulders or back. The tilt angle is between 103ยฐ and 112ยฐ, aligning with the natural curvature of the spine when relaxed. The armrest height is generally 21 to 22 cm, supporting the arms and reducing shoulder pressure.
Parameters Related to Design Principles: In terms of size adaptation, the chair width should refer to the hip width data of high-percentile females, while the depth should be based on data from smaller-bodied individuals. The height should not only consider the height data of the user group but also be compatible with the work surface height. Ideally, it should be adjustable to meet the needs of different users. Regarding compliance with human biomechanics, the seat and backrest should conform to the natural curvature of the spine. Soft and breathable materials should be used to optimize body pressure distribution and reduce discomfort caused by excessive local pressure.
Parameters Related to the EN 1335 - 1 Standard: In terms of size, it specifies the range of key dimensions such as seat depth, seat width, and seat height, including minimum and innovative limits as well as adjustment ranges, to accommodate the majority of adult users. It helps maintain the natural curvature of the spine when sitting and reduces static load on the lumbar muscles. Strength is verified through static and dynamic load tests. The static test simulates the impact of a user sitting down normally, while the dynamic test simulates actions such as repeated sitting and standing and backrest tilting. Regarding materials and structure, a five-claw base is the minimum configuration. Casters should be tested for rolling resistance and floor protection, and gas rods should pass anti-burst tests and comply with relevant safety standards. The durability test cycle far exceeds daily usage frequency, simulating years of wear and tear in an accelerated manner. Stability tests cover various situations such as forward, side, and backward tilting.
Other Parameters: In terms of adjustability, the chair height, seat angle, backrest angle, etc., should all be adjustable. Some zero-gravity chairs offer even more extensive adjustment functions. Regarding materials, the seat should be made of breathable and wear-resistant materials such as mesh or leather. The seat cushion should disperse pressure on the ischial tuberosities and prioritize materials with appropriate firmness.
