Wilkhahn Wilkening + Hahne Gmbh + Co.

Wilkhahn, Wilkening & Hahne

Roericht, Hans

Hans Roericht

Franz Biggel

Horst Fleischmann

A synchronous adjusting device for a chair is provided where the restoring movement of a back part is effected as a function of the weight of the user, a restoring moment occurring with the increase in inclination of the backrest. For this purpose, the back part is mounted rotatably relative to the seat part at a distance in height. The leaning force of the user at the back leaning point is counteracted by a restoring force in the lower region of the back part as a result of the articulated connection between the seat part and the back part.

Synchronous adjusting device for office chairs or the like

A pedestal stool is disclosed having a base carrying a stem on which a seat portion is supported. The base includes a sand-filled, bulbous, ground-engaging bag or sack to enable the stool to be tilted at any angle and held at that angle by virtue of the change in shape of the sack in response to the resultant flow of sand which produces a new equilibrium position for the stool.

Growing community of inventors

Ulm, Germany

Hans Roericht