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A chair, particularly an office chair, has a vertically adjustable seat carrying means at which, by means of a control linkage, a seat plate that can be adjusted in its slope is coupled as well as a backrest are coupled. The backrest adjusts itself as a function of the slope of the seat plate. The c

A chair, particularly an office chair, has a vertically adjustable seat carrying means at which, by means of a control linkage, a seat plate that can be adjusted in its slope is coupled as well as a backrest are coupled. The backrest adjusts itself as a function of the slope of the seat plate. The control linkage comprises coupling elements that are held at the seat carrying means and are arranged in the shape of scissors and are coupled to seat parts of a seat surface that are flexibly connected with one another. By means of this coupling, an imaginary axis of rotation in the knee area is formed that is transversely extending and unchangeable and is located in front of the seat surface. This axis of rotation in the knee area is located in an intersecting line that is formed between a horizontal plane of the seat surface when in a basic adjusted position and a diagonal plane of one coupling element when in an inclined adjusted position. As a result, an uncomfortable sitting is avoided when the chair is adjusted because no change of the user\s relevant support points takes place with respect to the chair as well as of the leg supporting points with respect to the contact surface of the chair.

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A chair, particularly an office chair, having a vertically adjustable seat carrying means including at least two seat plate means for adjusting the slope of the seat by means of a control linkage, one of said seat plate means being adjustable in its slope and fixedly attached to a seat backrest, and

A chair, particularly an office chair, having a vertically adjustable seat carrying means including at least two seat plate means for adjusting the slope of the seat by means of a control linkage, one of said seat plate means being adjustable in its slope and fixedly attached to a seat backrest, and said seat backrest being adjusted as a function of the slope of the said one seat plate means, said control linkage having at least two coupling elements that are held at the seat carrying means and are arranged in the shape of scissors, said coupling elements being coupled with said at least two plate means, a seat surface connected to said at least two plate means for inclination therewith as said one seat plate means has its slope adjusted and said at least two seat plate means being flexibly connected with one another to form an imaginary, height unchangeable transversely extending axis of rotation in a knee area that is located in front of the seat surface, said axis of rotation being located on an intersecting line formed by a horizontal plane of the seat surface when adjusted to a horizontal position and along a diagonal plane of one coupling element when said one seat plate means is sloped to an inclined adjusted position.