Locking chair tilt mechanism with torsion bar

Abstract

A locking chair tilt mechanism for a chair in which the backrest and rear seat portion tilt rearwardly and downwardly, and the front seat portion of the chair slides generally horizontally is disclosed. The chair is supported by a tilt mechanism mounted between the base and the chair. Front and rear support arms extend from the biasing member mounted on top of the base, to the chair frame. The front support arm is slidably and pivotably mounted to the chair frame to create the horizontal sliding movement of the front portion of the chair. The locking mechanism mounts immediately adjacent the elongated opening and comprises a pivotable locking bar, a high pitch screw fixedly attached to said bar, a rack with a first set of teeth and a gripping member threadably mounted on said screw with a second set of teeth. The first and second set of teeth are selectively cooperable upon rotation of the locking bar and screw through movement of the threadably mounted gripping member.

Dependencies are inferred from the claim text.