Breathing mask

DETAILED DESCRIPTION In accordance with the present invention, a size-determining face piece liner is a flexible face contacting member that has an inner breathing opening which is shaped to provide an aperture that has a narrow upper section and a wide lower section in order to surround and accommodate the nose and mouth of the wearer.
The wearer's nose bridge and sides fit through and are surrounded by the upper section.
The wearer's mouth fits through and is surrounded by the lower section.
As shown in FIG.
4, in its simplest form, the face contacting member 400 is made of flexible sheet material and has an outer edge profile 407, a periphery zone 401 surrounded by outer edge profile 407, a face contacting zone 402 surrounded by periphery zone 401 and an inner breathing cut-out opening 403 located within face contacting zone 402.
Opening 403 has a narrow upper section 404 and a wide lower section 405.
Face contacting member 400 is placed on wearer's face 408 such that the inner edge profile 409 of inner breathing cut-out opening 403 surrounds the wearer's nose and mouth and provides an effective seal between face contacting zone 402 and wearer's face 408.
A side view of face mask 410, assembled by attaching face contacting member 400 to filtration shell 406 at periphery zone 401 is shown in FIG.
4-A.
FIG.
4-B shows face mask 410 when placed on wearer's face.
As shown therein, face contacting member 400 deforms in order to conform to and accommodate the wearer's nose and provide a chin cup 411 that conforms to and accommodates the wearer's chin and thereby provide an effective air tight seal between face contacting zone 402 and wearer's face.
In accordance with the present invention, filtration shell 406 may be made in a variety of shades known in the art, for example, it may be of a three dimensional-double curvature shape or of a folded or pleated shape.
The folded surfaces and the pleats may be of a horizontal, vertical or any other orientation.
Likewise, face contacting liner 400 may be of a substantially flat, or of a folded shape in order to conform to the shape of filtration shell 406