Dimensions of Old-Fashioned Office Chairs

The general size range of rural old-fashioned office chairs (such as wooden models from the 1970s and 1980s) is as follows, supplemented with explanations based on modern office chair standards:

1. Seat Height The seat height of old-fashioned office chairs typically ranges from 40 to 45 centimeters. This range matches the comfortable height for the thighs to be parallel to the ground when sitting, suitable for the leg lengths of most adults. Modern adjustable office chairs extend the seat height range to 38 to 48 centimeters to accommodate users of different heights or special use scenarios (such as pairing with height-adjustable desks). However, the mainstream seat height for old-fashioned fixed models remains 40 to 45 centimeters.

2. Seat Depth Seat depth refers to the horizontal distance from the front edge of the seat to the backrest. The seat depth of old-fashioned office chairs is approximately 40 centimeters, with an actual range of 34 to 44 centimeters. This design ensures that when the user sits upright, the back can fit snugly against the backrest, while maintaining a gap of about 2-3 fingers between the back of the knees and the seat surface to avoid compressing blood vessels. If the seat depth is too short, it may cause the lower back to hang in the air; if it is too long, it will compress the back of the thighs and affect blood circulation.

3. Armrest Inner Width The armrest inner width refers to the horizontal distance between the inner sides of the two armrests. Old-fashioned office chairs typically require a width of no less than 46 centimeters to ensure that the user's arms can be placed comfortably in a natural sitting position, avoiding shoulder internal rotation or arm suspension. Modern office chairs also follow similar principles in armrest width design, but some models further optimize adaptability through adjustable armrests.

4. Backrest Height and Tilt Angle The backrest height of old-fashioned office chairs is divided into two types:

• Shoulder Support Type: With a height of approximately 63 centimeters, it is suitable for office scenarios where an upright sitting posture needs to be maintained, focusing on supporting the thoracic spine and scapular region.
• Head Support Type: With a height of approximately 91 centimeters, it can extend to the cervical spine and back of the head, suitable for users who work at a desk for long periods or need to briefly lean back and rest. The backrest tilt angle is usually 100°, meaning the angle between the backrest and the seat surface is 10° greater than a right angle. This angle can disperse spinal pressure and reduce fatigue from prolonged sitting. Modern ergonomic chairs have a wider range of tilt angles (95°-120°), but old-fashioned fixed models still mainly use 100°.

Supplementary Explanation The size design of old-fashioned office chairs was limited by the understanding of ergonomics and material technology at the time, with a focus on fixed structures and low flexibility. Modern office chairs further optimize adaptability through adjustable functions (such as seat height, backrest angle, armrest height, etc.). However, the sizes of old-fashioned chairs can still serve as a reference benchmark, especially for retro-style decorations or specific scenario requirements.