Patent ID: 6557939
Filing Date: 2003-05-06
Classification: A47C

Abstract:
A combination of an adjusting mechanism and a chair comprising said chair having an underframe with a base which is placed onto the ground and with a pneumatic spring which is inserted in said underframe along a vertical axis and has a telescopically extendable piston rod for setting the height of said chair, and a seat with a seat support at the bottom thereof and which is positioned on said piston rod; wherein, further said adjusting mechanism comprising:a seat plate which is supported by said seat support and has a front edge; a pivotable back support pivotably attached directly to said seat support along a main rotational axis which is transverse to and above said seat plate and parallel to said front edge of said seat plate; and an inclination spring which is affixed at one end to said seat support on a fixed rotational axis and at an opposite end to said back support on a moving rotational axis, wherein: said seat plate has a lower side with guide cranks and said seat support has supporting arms, which engage in said guide cranks such that said supporting arms are displaceable in a direction transverse to said main rotational axis; and said seat plate is affixed to said back support on said moving rotational axis; said back support includes two arms which are connected to one another in an articulated manner and which extend laterally from either side of said back support and above said seat plate; said seat support has at least two transverse extension arms extending in opposite directions therefrom and below said seat plate, each of said at least two transverse extension arms having a branch extending upwardly therefrom; and each of said two arms of said back support is connected in an articulated manner, along said main rotational axis, to a respective one of said branches of said at least two transverse extension arms.