Raffino - 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 to the user's left, adjusts the backrest tilt. This solution allows for easy adjustment of the backrest tilt angle without having to lean over.
The synchronous mechanism with 6 locking positions has a backrest tilt angle in the Ergo Raffino model ranging from 89°-122°. The synchronous mechanism allows simultaneous tilting of the backrest and seat in appropriate proportions. This keeps the body in an ergonomic position even when changing position, increasing comfort and relieving pressure on the spine.
The tilt angle lock allows the backrest to be stopped in the selected position. This is particularly important when working with concentration, where a stable and repeatable body position increases the precision of tasks performed. Proper adjustment improves weight distribution, increases comfort and supports an ergonomic pelvic position.
The ability to set a negative angle allows the backrest or seat to be tilted gently forward. This position supports active sitting, promotes an upright posture and reduces lumbar strain when working at a desk. Raising the handle to the first position activates the backrest tilt angle adjustment within the range given above. Raising it higher - to the second, distinctly palpable degree (signalled by a characteristic click of the pawl) - activates the function of gently tilting the entire backrest system together with the seat forward, supporting a more active, ergonomic sitting position. Return to the standard setting is achieved by lowering the handle one step down, which returns the backrest and seat to the initial position. Completely lowering the handle locks the mechanism, allowing the backrest to be stably locked in the selected setting.
The backrest tilt force, adjustable to the user's weight, is regulated by a knob located under the seat on the right side. This is an extremely important adjustment, as setting the backrest tilt force too high for light users (approx. 45kg) causes leg muscle tension and nerve compression leading to pain. Conversely, heavier users (approx. 90-120 kg) need stronger tilt force, as setting it too low will cause an unexpected maximum backward tilt and excessive tension in the front of the legs. The resistance force adjustment allows the pressure required to recline 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 sudden recline for a heavier person or excessive resistance for a lighter person.
The antishock mechanism protects the user from abrupt backrest return after unlocking. This prevents the backrest from hitting the back, and ensures smooth and safe position changes, increasing comfort and caring for the spine. To re-unlock the mechanism and set the backrest in the desired position, lean back against the backrest and gently push it backwards – this allows you to re-adjust the tilt angle to your needs.