Guquan Office Chair - Manual Adjustment

The model C570 of Guquan office chairs supports manual adjustment functions, which are mainly reflected in the following aspects:

1. Manual Lumbar Support Adjustment: Precise Fit to the Lumbar Spine
The lumbar support of the C570 allows for 5cm vertical adjustment + 3cm horizontal adjustment. Users can achieve precise positioning through manual operation based on their own lumbar spine position and support needs. This design provides direct support to the concave area of the lumbar spine, avoiding issues of insufficient support or excessive pressure caused by fixed lumbar supports. For example, during long hours of office work, users can adjust vertically to accommodate changes in lumbar spine position under different sitting postures, and horizontally to adjust the support intensity, thereby relieving lower back fatigue.

2. Segmented Backrest Design: Independent Support for Shoulders and Waist
The backrest of the C570 adopts a segmented structure, with independent designs for the shoulder and waist support areas. This design allows the shoulders and waist to receive targeted support separately when adjusting sitting postures manually (such as reclining or leaning forward), avoiding the sense of pressure caused by the rigid transitions of traditional one-piece backrests. For example, when reclining for a rest, the waist support area can maintain a snug fit, while the shoulder support area naturally adjusts its angle with the body's recline, enhancing comfort.

3. Headrest Rotation Adjustment: Fits the Neck Curve
The headrest of the C570 supports 45° rotation adjustment. Users can manually rotate the headrest angle to ensure a tight fit to the neck curve when reclining. This function is particularly suitable for scenarios requiring short breaks, such as during lunch breaks, when users can adjust the headrest angle to avoid the neck hanging in the air and reduce cervical spine pressure.

Comparison with Other Models

• C575: The lumbar support uses a "dual-spring support" automatic adjustment system, requiring no manual operation, but offering less flexibility than the C570.
• C533: No explicit mention of manual adjustment functions, likely featuring a fixed design that cannot meet users' needs for personalized support.

Summary
If manual adjustment functions are required, the C570 is the only model among Guquan office chairs that explicitly supports multi-dimensional manual adjustments. Its adjustment designs for the lumbar support, backrest, and headrest all focus on user-initiated operation, making it suitable for users with high demands for support precision and comfort.