Chair structure and tilt mechanism therefor

Claim 1

An improved chair construction for office type chairs and the like, comprising: a base for supporting the chair on a floor; a spindle extending substantially vertically from said base; a tilt mechanism connected to the upper end of said spindle, said tilt mechanism including first, second and third interconnected frame members, with said second frame member connected to said spindle; a chair seat structural member, having a molded shell on one side thereof and said molded shell having apertures on the side edges thereof, said first frame member connected to said chair seat structural member; a back mounting bar connected to said third frame member proximate the midpoint of said bar and extending laterally of said tilt mechanism in both directions; a pair of chair arms, one of said chair arms being fixed, within said molded shell through said apertures, to each laterally extending end of said back mounting bar; a chair back structural member; a chair back support member constructed and arranged to carry and support said chair back structural member, said chair back support member extending across the back of said chair and being secured at each extremity to one of said chair arms, whereby force applied to the back of said chair will cause said chair back to tilt with respect to said seat and said arms will move with said back.