Office Chair Height and Angle Adjustment

The height and angle adjustment functions of office chairs cover height, backrest angle, and adjustment methods, as detailed below:

I. Seat Height Adjustment

Seat height adjustment is achieved through a height adjustment lever, typically located directly beneath the front edge of the seat cushion or on the side. To adjust, pull up the lever before sitting down, allowing the seat to naturally rise or fall to the appropriate height. The standard is: feet flat on the ground, thighs parallel to the ground, knees slightly lower than the hips, and elbows aligned with the height of the desk when arms are hanging naturally. Release the lever to lock the height. This function accommodates users of different heights, ensuring an ergonomic sitting posture and reducing fatigue from prolonged sitting.

II. Backrest Angle Adjustment

1. Basic Recline Angle Adjustment
   The adjustment handle is usually located on the right side of the chair, beneath the seat cushion, or on the side of the armrest. Some chairs have a separate recline adjustment lever. To operate, pull outward or lift upward on the handle, allowing the backrest to enter a free recline state. The user can then lean back slowly using back strength, adjusting to a comfortable angle before releasing the handle to automatically lock the backrest.

   • Angle Range: According to national standards, the original reference angle (the angle between the backrest and the seat surface) of an office chair should be 90° to 95°. In actual use, 90°-110° is recommended for focused work, while 110°-130° can be adjusted for relaxation scenarios such as lunch breaks to fit the lumbar curve and relieve back pressure.
   • Locking Method: Some chairs support multi-stage locking, providing a noticeable click when reclined to preset positions. Releasing the handle fixes the position, suitable for scenarios requiring stable support.

2. Backrest Tension/Resistance Adjustment
   The adjustment knob is typically located at the bottom of the chair (near the gas lift) or on the side, used to adjust the resistance when reclining. Turning the knob clockwise increases resistance (suitable for heavier users), while turning it counterclockwise decreases resistance (suitable for lighter users). This function does not directly change the angle but optimizes the recline feel, avoiding discomfort caused by excessive or insufficient resistance.

III. Adjustment Methods

1. Lever-Type: Achieved through a lever beneath the seat, pulling up or pushing down allows the body to lean back to change the backrest angle, which locks in place upon release. Simple to operate, suitable for basic office chairs.
2. Knob-Type: Adjusts the tightness of the gas spring by rotating the knob to control recline resistance or lock the angle. The knob is usually located on the side or rear of the seat, with counterclockwise rotation decreasing resistance and clockwise rotation increasing it.
3. Electric-Type: High-end office chairs are equipped with an electric adjustment system, enabling precise and stepless angle adjustment via buttons or a control panel to meet personalized needs.