Chair having a seat that is adjustable in a height and width

A chair, more particularly for children and young persons, comprising a seat adapted to be adjusted in height and depth, a back rest arranged above the seat, a chair body adapted to be stood on the ground, on which at least one rack rail extending in the vertical direction is arranged and on which furthermore a holding means, associated with the seat, is adapted to run for adjustment in height, said holding means having a guide portion formed on it, at least one gear wheel arranged in a rotatable manner on the holding means, one said gear wheel being in engagement with one said rack rail, and at least one drive means adapted to be caused to perform rotary movement by said one gear wheel during vertical adjustment, said at least one drive means being arranged on said holding means, said holding means constituting a seat holding part extending from its guide portion, on which seat holding part a seat carrying part, connected with the seat is adapted to run in the direction of depth adjustment, said seat carrying part being drivingly connected with said at least one drive means in such a manner that on resetting the holding means the seat is not only reset in height but automatically also in depth so that during its displacement upward or downward it simultaneously moves further forward or, respectively, rearward, wherein said at least one drive means is connected with the seat carrying part via flexible tension force transmitting means to provide a driving connection, the tension force transmission means running on the holding means free of slip around the drive means and around seat direction changing means and having a section extending along the seat holding part in the direction of depth adjustment, on which section of the flexible tension force transmitting means the seat carrying part is attached.