Patent ID: 8151797

Claim:
A respiration mask assembly comprising: a mask body having a front part that defines a front opening adapted to communicate fluidly with a gas supply, and a rear part that defines a rear opening opposite to said front opening in a horizontal direction; a forehead support beam extending outwardly from and pivoted to said front part of said mask body so as to rotate relative to said mask body about a first axis transverse to said horizontal direction; and a worm pivoted to said front part of said mask body, said forehead support beam having a toothed pivot end engaging said worm such that rotation of said worm about a second axis transverse to said first axis results in rotation of said forehead support beam about said first axis; and wherein said front part of said mask body is formed with a mounting recess, said worm being received in said mounting recess; and wherein said mounting recess is defined by a recess-defining wall that has a top open end, a front open end, and a rear closed end opposite to said front open end in the horizontal direction, said top open end defining a top opening of said mounting recess for extension of said toothed pivot end of said forehead support beam therethrough and into said mounting recess, said front open end defining a front opening of said mounting recess, said front part of said mask body being provided with a supporting plate that is fitted into said front open end of said recess-defining wall to cover said front opening of said mounting recess, said worm having first and second pivot ends that are pivoted to said rear closed end of said recess-defining wall and said supporting plate, respectively, and that cooperatively define said second axis.