Patent ID: 8387619

Claim:
A respiratory mask comprising: a single-piece first cushion ring defining an airflow channel and having a first surrounding wall that extends around said airflow channel and that includes a first rear abutment end portion adapted to abut against a user's face below the forehead, and a first front cover-engaging end portion opposite to said first rear abutment end portion, said first front cover-engaging end portion having an inner surface provided with an annular first retaining recess extending around said airflow channel, and an annular first end flange projecting inwardly from an end of said first front cover-engaging end portion in proximity to said annular first retaining recess; a first cover shell having a first cover plate engaged to said first front cover-engaging end portion and provided with a connecting hole that is adapted to be connected to an air supply source; a resilient forehead support connected to a top end of said first front cover-engaging end portion and bendable toward said first rear abutment end portion; a resilient forehead abutment body connected to a top end of and supported by said resilient forehead support and including a second cushion ring adapted to abut against the forehead of the user; and an adjustable head strap unit connected to said first cover shell and said resilient forehead abutment body; and a first clamping ring fitted in said annular first retaining recess and having an inner peripheral wall that extends around said airflow channel and that has front and rear edges, an outer peripheral wall that extends around said inner peripheral wall, that abuts against said inner surface of said first front cover-engaging end portion, and that has front and rear edges, an annular groove formed between said inner and outer peripheral walls and opening at said front edges of said inner and outer peripheral walls, and a web portion interconnecting said rear edges of said inner and outer peripheral walls, said front edge of said outer peripheral wall abutting against said annular first end flange.