Forehead support for facial masks extendable and contratable with the use of an adjustment knob

摘要

A forehead support (12) for a mask assembly (10) includes a frame connector (20) provided to a mask frame (14), a forehead cushion support (60) movably mounted to the frame connector for generally linear movement between retracted and extended positions with respect to the frame connector, and an adjustment knob (40) movably mounted to the frame connector and threadably engaged with the forehead cushion support such that turning movement of the adjustment knob causes the forehead cushion support to be moved between the retracted and extended positions. The adjustment knob may have a ratchet bump to provide indexed incremental adjustment. The frame connector may have a cut-out that allows an upper portion of an internally threaded tube provided to the cushion support to be visible.