Forehead supports for facial masks

摘要

A forehead support for a mask assembly includes a frame connector provided to a mask frame, a forehead cushion support 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 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 includes a resilient prong having a ratchet bump. The ratchet bump is adapted to selectively engage a series of ridges provided to the frame connector to provide indexed incremental adjustment.

主权项

1. A forehead support for a mask assembly, the forehead support comprising:
a frame connector; a forehead cushion support comprising a forehead cushion support plate and a tube, said forehead cushion support being linearly adjustable with respect to the frame connector along a longitudinal axis of the tube between a retracted position and an extended position; a forehead cushion provided to the forehead cushion support plate; at least two protrusions and at least two corresponding keyways positioned superior to a horizontal plane containing the longitudinal axis of the tube, the at least two protrusions and the at least two corresponding keyways structured to prevent rotation of the forehead cushion support about the longitudinal axis of the tube with respect to the frame connector, each of the at least two protrusions extending into a respective one of the at least two corresponding keyways; and a finger operable member projecting from the frame connector and movably mounted to the frame connector to allow adjustment of the forehead cushion support with respect to the frame connector.