Patent ID: 6139108
Filing Date: 2000-10-31
Classification: A47C

Abstract:
A chair frame, comprising:a) a seat portion comprising:i) a front seat rail having:1) a pair of terminal ends; and2) a midpoint being midway between said pair of terminal ends of said front seat rail; andii) a rear seat rail having a pair of terminal ends, and being spaced behind said front seat rail of said seat portion;b) a seat back portion extending upwardly from said seat portion; said seat back portion comprising a pair of stiles; each stile of said seat back portion extending upwardly from an associated terminal end of said rear seat rail, to a terminal end;c) a plurality of legs depending from said seat portion; said plurality of legs comprising a pair of rear legs; each rear leg depending from an associated terminal end of said rear seat rail to a free terminal end, and being collinear with an associated stile of said seat back portion; andd) bracing extending from said plurality of legs; said bracing comprising a pair of diagonal braces; each diagonal brace of said bracing extending from said free terminal end of an associated rear leg to said midpoint of said front seat rail, and together with said rear stretcher of said bracing, forming a triangular configuration for said bracing, with said triangular configuration effectively triangulating said seat portion, so that upon tilting back on said pair of rear legs, said pair of diagonal braces compress by virtue of said seat portion, and joints between said front seat rail, said diagonal braces, and said pair of rear legs are strengthened by being forced together, which prevents said seat portion from breaking downwards at its critical joint with said seat back portion, and with said triangular configuration also preventing wracking, which is side-to-side twisting, of said seat portion, and with said rear stretcher limiting effects of someone tilting said chair frame to a side while seated.