The invention relates to a folding mounting assembly mounted on a mobile stand for controlling movement of a projector arm, having a projector at one end, from an operable position substantially perpendicular to a screen or other surface mounted on the stand and onto which the projector is intended to project and a closed position parallel to the screen. The assembly comprises a vertical support member that is connectable to the stand and a projector arm mounting means pivotally connected to the vertical support member by means to control the rate of movement of the projector arm mounting means so that it can easily be manually moved from the operable to the closed position and vice versa and will support a projector arm.