Vitra Patente Ag

Egon Br&auml;uning

The adjustment mechanism contains a pneumatic spring that is placed vertically in the underframe, for adjusting height, and a pneumatic spring that is linked to the seat support at one end and the back-rest at the other, for synchronized adjustment of the angle. The pivotable back-rest and the fixed seat support are coupled with each other on the main rotational axis in two hinge connections. The main rotational axis runs above and crosswise over the seat plate. The seat plate has guide cranks on its underside, the supporting arms of the seat support engaging is said guide cranks in such a way that they can slide crosswise to the main rotational axis. The front bearing pegs of the supporting arms engage in the guide cranks. The seat plate is coupled together with the inclination spring on the moving rotational axis on the back-rest. The invention also relates to a back cover with a variably positionable lumbar reinforcement insert and height-adjustable armrests. The inventive adjustment mechanism offers efficient and comfortable synchronization between the sequences of movement of the back-rest and the seat plate.

Adjustment mechanism, back cover and arm rest for a chair

The chair mechanism is configured as a so-called synchronizing mechanism in order, in the case of an adjustment in inclination of the rear support ( ), to achieve simultaneous, harmonic adjustment of the seat panel ( ). The underframe is positioned on a height-adjustable pneumatic spring ( ). For the synchronized movement, use is made of a mechanical torsion spring, preferably a rubber spring, and a further mechanical spring, preferably a helical spring, is arranged parallel thereto, with accumulative effect in relation to the resistance of the torsion spring. The strength of the torsion spring can be adjusted. The positioning of the axes of rotation (A -A ) is of considerable importance for the kinematics. The chair can be adjusted from an assembly position, where the springs can be inserted in a state in which they are relieved of stressing, via the vertical position into the inclined position. The most prominent advantages of the chair mechanism are the large opening angle between the seat panel ( ) and backrest in the inclined position, the adjustable degree of stiffness, and the compliant seat shell.

Chair mechanism

Movable office furniture consisting of the following system components: a travelling table (,), a filing trolley (,) a cupboard, an equipment box and a shelf partition (,). Said office furniture can be used in permanent company offices, at exhibitions, conferences or in the home. The tables have no cross tie-bars close to the ground between legs. At least one interchangeable box (,) can be inserted into the various types of trolleys (,). Many of such boxes can be inserted into cupboards. Shelves can be installed on shelf partitions (,) and office equipment and stationery can be stored thereon. Shelf partitions (,) can be placed back to back to form a double wall in a room and have the advantage of being produced from sound absorbing material. The office furniture can be spontaneously rearranged and several components of the system are interslidable in order to gain space.

Growing community of inventors

Weil am Rhein, Germany

Egon Bräuning

Growing community of inventors

Weil am Rhein, Germany

Egon Br&auml;uning

Egon Bräuning