Mechanism for a chair

A mechanism for a chair, comprising:

• a base support to be placed on a chair column;
• a seat support disposed on said base support and movable in a longitudinal direction of the chair relative to said base support;
• a backrest support connected to said seat support;
• wherein one or both of the following is true:
• said seat support including a first seat support element and a second seat support element, said second seat support element being mounted for a translation and a rotation and being movable transversely with respect to the longitudinal direction of the chair relative to said first seat support element;
• or
• said backrest support including a first backrest support element and a second backrest support element, said second backrest support element being rotatably mounted relative to said first backrest support element about a rotational axis extending in the longitudinal direction of the chair;
• at least one controller arrangement connecting said second seat support element to said first seat support element, said controller arrangement including two controllers each being pivotally mounted both on said first seat support element so as to be rotatable about a first rotational axis and on said second seat support element so as to be rotatable about a second rotational axis, wherein said rotational axes are parallel with one another and extend in the longitudinal direction of the chair.