Abstract: The object of the invention is a convertible, dual function chair for sitting and kneeling, which gives the possibility of changing the position and relieving the spinal column during a prolonged work in a sitting position. The dual function chair for sitting and kneeling is equipped with a movable backrest and headrest support, shaped in the lower part in such a way that its displacement changes the size of the chair simultaneously vertically and horizontally. It is also equipped with a sliding-rotating-returning or a sliding-returning backrest device, which makes it follow the user's back and support it accurately at every angle of inclination of the backrest when tilting the backrest.

Abstract: The subject matter of the invention is a convertible bi-functional chair for sitting and kneeling, which allows to change positions and relieve the spine during long-lasting work involving sitting or long travels by plane, bus or train. The bi-functional chair for sitting and kneeling comprises a movable rotating seat (1), back rest (3) and knee support (6). It is equipped with devices allowing to change the distance between the front edge of the seat and the back rest, the angle of inclination of the back rest with regard to the seat and the height of the back rest with regard to the seat, which enables converting the seat and back rest for classic sitting into a seat and back rest for kneeling and vice versa.

Abstract: A dual functional chair with a dividable seat may be used in a sitting and kneeling-sitting configuration. The seat includes a front part (1) that is convertible into a knee rest. The front part is operatively connected rotationally and slidably or rotationally only, to a movable front arm of a base of the seat, rotating on the axis of a rotational mechanism (3). The seat includes a rear part (4) having a variable angle of inclination, operatively connected via a rotational mechanism (5) to a rear arm (6) of the base of the seat.

Abstract: The object of the invention is a dual functional chair with a dividable seat to be used in a sitting and kneeling-sitting configuration, in which the seat consists of a front part (1) of the seat convertible into a knee rest and connected rotationally and slidably or rotationally only to a movable front arm of a base of the seat, rotating on the axis of a rotational mechanism (3), and of the rear part (4) of the seat having a variable angle of inclination, connected via a rotational mechanism (5) to a rear arm (6) of the base of the seat.