Forehead support for facial mask

A respiratory mask assembly for delivering breathable gas to a patient, comprising:

• a frame;
• and
• a forehead support secured to the frame, the forehead support including:
• a joining member secured to an upper portion of the frame;
• and
• a cushion frame movably mounted to the joining member;
• one of the joining member and the cushion frame including a pair of shafts and the other of the joining member and the cushion frame including a pair of openings, the pair of shafts being respectively received in the pair of openings to couple the cushion frame to the joining member and enable the cushion frame to move relative to the joining member;
• wherein each of the shafts has a non-circular cross section including longitudinal edges that define a major longitudinal axis therebetween, the major longitudinal axis being angled forwardly of a vertical axis of one of the joining member and the cushion frame so as to angle toward a front portion of one the joining member and the cushion frame.