Patent ID: 7621274
Filing Date: 2009-11-24
Classification: A61M

Abstract:
1. A mask including: a shell; a cushion connected with said shell; said shell having a side wall; a retaining ring permanently secured to the shell inside said side wall, said side wall and said retaining ring defining a gap between said side wall and said retaining ring, said gap extending around said shell, wherein said retaining ring has a notch in cross-section; wherein said shell includes a plurality of projecting posts, and said retaining ring includes a plurality of sleeves receiving said posts to permanently secure said retaining ring inside said side wall of said shell; said cushion having a side wall with an outer peripheral edge portion including a tongue extending around said cushion, said tongue having a retaining flange that extends transverse to the tongue in cross-section; said retaining flange of said cushion tongue and said notch of said retaining ring being configured such that said tongue is repeatably insertable into said gap while the retaining ring is secured to the shell so that the retaining flange of the tongue engages the notch of the retaining ring to secure said cushion to said shell and the retaining flange of the tongue is repeatably removeable from the notch of the retaining ring while the retaining ring is secured to the shell to remove the cushion from the shell.