A piece of sitting furniture comprising a backrest, a seat, and a functional unit, the functional unit being designed and equipped to be attached to a base, and a use of the piece of sitting furniture

A piece of sitting furniture comprising:

• a backrest;
• a seat;
• a base;
• and
• a functional unit arranged under the seat and configured to be attached to the base,
• wherein each of the backrest, the seat, and the functional unit comprises at least one firmly attached hinge element,
• wherein the functional unit comprises a sliding bearing, which includes a housing firmly attached to a front part of the functional unit and forms an acute angle (α) with a main plane (H) of the functional unit,
• wherein the piece of sitting furniture further comprises:
• a front bearing between the sliding bearing and a seat element of the seat;
• a first rotational bearing between the seat and the backrest;
• and
• a second rotational bearing between the functional unit and the backrest, and
• wherein the first rotational bearing and the second rotational bearing are arranged at a rear part of the seat, and the first rotational bearing is arranged under the second rotational bearing.