Abstract: A chair tilt control mechanism includes an actuator handle for locking and unlocking the tilt control mechanism. The actuator handle is a self-contained assembly which is readily mountable to the chair, and includes a hollow housing and a rotatable shaft which is rotatably supported on the housing. The housing includes a V-shaped camming surface and the shaft includes a radial projection which slides axially and circumferentially along the camming surface to positively define locked and unlocked position for actuator handle. The radial projection also defines a stop which allows assembly of the housing and shaft together without fasteners while preventing disassembly when engaged with the camming surface.