Combination of a seat and a backrest supported by a frame

摘要

The present invention relates to a combination of a seat and a backrest supported by a frame, wherein said combination includes means for effecting movement of the seat with respect to the backrest, in such a manner that a person sitting on said seat is subjected to a reciprocating pivoting movement about a substantially vertical axis. The seat comprises two parts, which parts are arranged on either side of a vertical plane that extends at least substantially transversely to the backrest. Means are provided for moving said seat parts to and fro in directions opposed to each other.