Patent ID: 7281764
Filing Date: 2007-10-16
Classification: A47C

Abstract:
1. A chair having a seat assembly and a back assembly which are interconnected in a four-bar linkage arrangement, the chair including a base wherein the four-bar linkage arrangement includes a base link fixed to the base and a front link pivotally interconnected to the base link and the seat assembly so as to pivot rearwardly upon tilting of said seat and back assemblies, a tension control mechanism including a spring arrangement comprising a coil spring affixed to the base link and an adjustment linkage having a back linkage end connected to a front end of said coil spring and a front linkage end connected to said front link, said back linkage end being slidable axially along the longitudinal axis of said spring and said front linkage end being slidable vertically along said front link wherein the vertical position of said front linkage end on said front link defines the axial displacement of said back end of said adjustment linkage during rearward pivoting of said front link.