Height-adjustable chair back

摘要

A height-adjustment mechanism is connected between a back assembly of a chair and a rigid upright supported on a seat assembly for selectively adjusting the height of the back assembly relative to the seat assembly. The height-adjustment mechanism is formed as a self-contained cartridge which releasably snaps into a downward opening compartment of the back assembly and does not require the use of separate independent fasteners. The height-adjustment mechanism is formed of a minimum number of parts, namely a plastic housing, a spring plate and an actuator pivotally connected to the housing. The height-adjustment mechanism includes a catch or projection formed on the spring plate which projects into one of a plurality of vertically spaced apertures formed in the upright. While the catch is slidable upwardly along the upright when raising the back assembly, the actuator disengages the catch from the upright to allow downward movement of the back assembly.