Takumi - mechanism

The mechanism was designed with maximum ergonomics and ease of use in mind. The second handle (dimensions 73x23 mm), made of polished aluminium and placed on the user's left side, adjusts the backrest tilt. This solution allows for easy adjustment of the backrest tilt angle without having to lean forward.

The synchronous mechanism with 6 locking positions has a backrest tilt angle ranging from 85°–125°. The synchronous mechanism allows for simultaneous tilting of the backrest and seat in appropriate proportions. This ensures the body remains in an ergonomic position even when changing positions, increasing comfort and relieving spinal pressure.

The tilt angle lock allows the backrest to be stopped in the chosen position. This is particularly important when working on tasks requiring concentration, as a stable and repeatable body position increases the precision of tasks performed. The correct setting improves body weight distribution, increases comfort, and supports ergonomic pelvic alignment.

The ability to set a negative angle allows for a slight forward tilt of the backrest or seat. This position supports active sitting, promotes an upright posture, and reduces strain on the lumbar spine when working at a desk. Lifting the handle to the first position activates the backrest tilt adjustment within the range specified above. Lifting it higher – to the second, clearly palpable degree (indicated by a characteristic click of the detent) – activates the function of a slight forward tilt of the entire backrest and seat system, supporting a more active, ergonomic sitting position. Returning to the standard setting occurs by lowering the handle one degree, which restores the backrest and seat to their initial position. Fully lowering the handle locks the mechanism, allowing the backrest to be stably locked in the chosen setting.

The backrest tilt force, adjustable to the user's weight, is controlled by a knob located under the seat on the right side. This is an extremely important adjustment, as too strong a backrest tilt force setting for light individuals (approx. 45 kg) causes leg muscle tension and nerve compression leading to pain. In contrast, heavier individuals (approx. 90-120 kg) require a stronger tilt force, as too weak a setting will cause an unexpected maximum backward tilt and excessive tension in the front of the legs. The resistance force adjustment allows the pressure needed to tilt the backrest to be matched to the user's weight and preferences. This ensures smooth and controlled movement, and the backrest provides stable support without the effect of a sudden tilt for heavier individuals or excessive resistance for lighter individuals.

The anti-shock mechanism protects the user from a sudden return of the backrest after releasing the lock. This prevents the backrest from hitting the back, and position changes are smooth and safe, increasing comfort and caring for the spine. To unlock the mechanism again and set the backrest in the desired position, lean back on the backrest and gently push it backward – this allows you to re-adjust the tilt angle to your needs.