Abstract: A chair control mechanism is adapted to decrease a likelihood of the mechanism becoming unintentionally disengaged from a locked position. In particular, a control arm has locked position wherein a seat plate is restricted in movement relative to a main bracket and an unlocked position where the movement relative to said main bracket is allowed. A latch bar is biased against the control arm and the control arm is notched such that axial sliding of the control arm into said unlocked position is possible only after providing a force necessary to disengage said latch bar from said notch.

Abstract: A chair height control mechanism has a gas cylinder with a valve control finger extending from an upper end overlain by a tilting actuator. A resilient pad is adhered to the upper end of the gas cylinder surrounding the valve control finger and maintains a spacing between the valve control finger and actuator when the actuator is not in use to avoid rattle.