Adjustable locking forehread support for a patient interface device

A patient interface device, comprising:

• (a) a patient sealing assembly adapted to communicate a flow of breathing gas within an airway of a patient, the patient sealing assembly including a cushion and a frame member coupled to the cushion;
• and
• (b) an adjustable forehead support assembly provided at a distal end of the frame member, the adjustable forehead support assembly including an adjustment mechanism coupled to a forehead cushion, the adjustment mechanism including:
• (i) a housing, (ii) a forehead cushion support member having a base portion coupled to the forehead cushion and an elongated post member extending from the base portion and received within the housing, and
• (ii) a locking member structured to be selectively coupled to the elongated post member, the locking member being moveable between a locked condition and an unlocked condition, wherein in the locked condition the locking member engages the elongated post member and prevents the elongated post member from moving relative to the housing, and wherein in the unlocked condition the locking member does not engage the elongated post member such that the elongated post member and the housing are freely linearly movable with respect to one another in a direction along a longitudinal axis of the elongated post member without any spring bias being applied to the elongated post member along the longitudinal axis, wherein movement of the elongated post member relative to the housing causes movement of the frame member and the cushion relative to the forehead cushion, and wherein the locking member includes an elastic member held within the housing and a button member having an engagement portion and a looped portion defining a first orifice extending downwardly from the engagement portion, wherein the looped portion is received within the housing through a second orifice provided in the housing and engages the elastic member, wherein the elongated post member is received through the first orifice, and wherein the locking member is moved to the unlocked condition responsive to a force being applied to the engagement portion causing the elastic member to be compressed.