Chair with seat depth adjustment

摘要

A chair, in particular an office chair, is provided with a chair frame, a seat supported thereon and a backrest. The seat comprises a base portion constituting the main face and a rim portion supported on its front rim to be pivotable about a horizontal transverse axis and which is adjustable into different pivoted positions referred to the base portion by means of an adjusting mechanism for adjustment of the seat depth of the seating face. The adjusting mechanism comprises an adjusting spindle rotatably supported on the base portion in parallel to the transverse axis underneath the seat and on which a two-armed adjusting lever extending at right angles to the adjusting spindle is supported to be pivotable about the adjusting spindle and to be displaceable in the direction of the spindle axis by a spindle rotation. With its bracket facing the rim portion the adjusting lever is in articulated connection with the rim portion. With its guide arm facing the base portion the adjusting lever is in engagement with an inclined guidance of a guide link on the base portion, so that when transversely displaced occasioned by the spindle rotation the adjusting lever and with it the rim portion are pivotable.