Office Chair Limit

The limit of office chairs mainly involves three aspects: the recline angle, lumbar support adjustment, and rocking function. The specific limit mechanisms and ranges are as follows:

Recline Angle Limit

The limit design of the recline angle of an office chair directly affects user comfort and safety. The recline angle of ergonomic chairs is typically between 125 and 135 degrees, a range that effectively distributes body pressure and is suitable for short breaks. The recline angle of ordinary office chairs is mostly between 110 and 120 degrees, focusing more on the slight recline needs during daily office work. High-end office chairs are equipped with multi-stage locking functions, allowing for step-by-step adjustment through paddles or knobs on the side of the backrest. Users can fix the chair at a specific angle according to their needs, preventing excessive or insufficient recline. The limit of the recline angle is mainly achieved through the mechanical structure between the backrest and the base, such as controlling the recline resistance through springs or dampers to ensure smooth and controllable angle changes.

Lumbar Support Adjustment Limit

The limit mechanism for lumbar support adjustment aims to provide precise lumbar support. A lumbar support adjustment system with a limit mechanism typically includes a lumbar support adjustment motor, a rotating rod, rotating parts, and limit slots. The motor drives the rotating rod to turn, which in turn drives the rotating parts fixed on both sides of the backrest. The limit slots on the rotating parts restrict the rotation range of the lumbar support, thereby controlling its angle adjustment. This design ensures that the lumbar support always moves within a safe range, preventing support failure or structural damage due to excessive adjustment. Some high-end models also support multi-position locking for lumbar support adjustment, allowing users to fix the lumbar support position according to their body type and sitting posture needs, enhancing long-term comfort.

Rocking Function Limit

The rocking function is achieved through the spring-damper system and shaft linkage of the base, allowing the seat and backrest to recline or tilt forward and return synchronously, forming a small rocking range of 15°–35°. The limit of this function mainly relies on the mechanical structure of the base, such as controlling the rocking amplitude through the elastic coefficient of the springs or regulating the rocking speed through dampers. Some models support infinite suspension, allowing users to pause the rocking at any angle; others offer resistance fine-tuning options, enabling users to adjust the tightness of the rocking through knobs or paddles to suit different weights or usage habits. The limit design of the rocking function needs to balance flexibility and stability, ensuring a natural rocking process and preventing the risk of tipping over due to excessive amplitude.