Patent ID: 7425037
Filing Date: 2008-09-16
Classification: A47C

Abstract:
1. A chair comprising: a housing; a fulcrum member having a curved support surface; a back support pivotally connected to said housing at a pivot axis, said back support pivotable between at least an upright position and a rearward tilt position; at least one leaf spring having first and second ends, said first end restrained by said housing, wherein said at least one leaf spring engages said curved support surface of said fulcrum member at a first contact location when said back support is in said upright position and wherein said at least one leaf spring engages said curved support surface of said fulcrum at a second contact location when said back support is in said rearward tilt position, and wherein said second contact location is positioned rearwardly on said at least one leaf spring relative to said first contact location; and a link member pivotally connected to said back support at a first pivot location and pivotally connected to said at least one leaf spring at a second pivot location, wherein said link member defines a vector between said first and second pivot locations, wherein said first pivot location and said pivot axis define a plane, wherein said vector and said plane define a first angle when said back support is in said upright position, wherein said vector and said plane define a second angle when said back support is in said rearward tilt position, and wherein said second angle is closer to ninety degrees than said first angle.