Office Chair Mechanism Classification

Office chair mechanisms are mainly divided into two categories: reclining and non-reclining. Among them, reclining mechanisms can be further subdivided into back-reclining, seat-reclining, and synchronous-reclining mechanisms.

Back-Reclining Mechanism: The core feature of this mechanism is that the backrest can recline backward while the seat remains horizontal. This design ensures that when the user reclines, the contact position between the buttocks and the seat remains unchanged, with only the support angle of the back being adjusted. It is suitable for scenarios where users need to briefly relax their back muscles, such as when reading or answering phone calls. Its structure is relatively simple, with lower costs, and is commonly found in basic office chairs.

Seat-Reclining Mechanism: This mechanism adopts an integrated seat-and-backrest design. When reclining, the seat and backrest move synchronously, maintaining a constant angle between them, similar to the motion trajectory of a seesaw. Depending on the position of the connection point, it can be divided into two types:

• Mid-Mounted Seat-Reclining: The force application point is located in the middle of the seat. When reclining, the buttocks sink and the knees rise, suitable for taller users, but may have an impact on the pressure distribution on the legs.
• Front-Mounted Seat-Reclining: The force application point is close to the front of the seat. When reclining, the buttocks sink while the knees remain basically horizontal, more in line with the natural sitting posture of the human body, especially suitable for long-term office scenarios.

Synchronous-Reclining Mechanism: As a core configuration of high-end ergonomic chairs, its characteristic is that the seat and backrest shift synchronously, and the motion trajectory is optimized through ergonomics to perfectly fit the physiological curve of the spine when reclining. Such mechanisms are further subdivided into:

• Operation Adjustment Methods: Including cable control adjustment (controlling the reclining force through a cable), mechanical adjustment (manual adjustment via knobs or levers), and self-weight adjustment (automatically matching the resistance according to the user's weight).
• Reclining Locking Functions: Multi-level locking provides fixed angle options, suitable for scenarios requiring stable support; follow-back locking allows the backrest to dynamically adjust its angle as the body reclines, ensuring full support throughout. Synchronous-reclining mechanisms are achieved through precise mechanical structures or pneumatic devices, often accompanied by more complex manufacturing processes and higher costs, but can significantly enhance sitting comfort for extended periods.