초록 ▼

A filter respirator forming a face mask to be worn upon the face of a user including a support layer of flexible material. The support layer is molded to conform to the contours of the face of the user and forms a flexible support layer for filter material. A separate layer of filter material filter

A filter respirator forming a face mask to be worn upon the face of a user including a support layer of flexible material. The support layer is molded to conform to the contours of the face of the user and forms a flexible support layer for filter material. A separate layer of filter material filters out impurities. An exhalation valve extends through the support layer and the filter layer in a central position. The exhalation valve includes an inside surface surrounding the central position. A molded non-porous flexible inner flange forms a flexible half-mask for sealing to the face of the user. The inner flange is attached to the peripheral edges of at least the support layer and extends inward to the central position. The inner flange includes a central opening with a surrounding portion conforming and adjacent to the inside surface of the exhalation valve. This forms an inhalation valve between the inside surface of the exhalation passage and the surrounding portion of the central opening of the inner flange.

대표청구항 ▼

A filter respirator forming a face mask to be worn upon the face of a user for providing filtering of impurities in the air, including, a support layer of flexible material including outer peripheral edges generally conforming to the contours of the face of the user and forming a flexible support la

A filter respirator forming a face mask to be worn upon the face of a user for providing filtering of impurities in the air, including, a support layer of flexible material including outer peripheral edges generally conforming to the contours of the face of the user and forming a flexible support layer of filter material and constructed to allow air inhaled by the user to flow through the support layer, a separate layer of filter material supported by the support layer of flexible material and having properties of filtering impurities in the air inhaled by the user, an exhalation valve extending through the support layer and the filter layer in a central position for exhausting air exhaled by the user and including an inside surface within the central position, and a non-porous flexible inner flange forming a flexible half-mask conforming to the contours of the face of the user, means providing for the passage of the inhaled air through the support layer and the layer of filter material and the deflection of such inhaled air by the inner flange, said means comprising said inner flange being sealingly attached to the outer peripheral edges of at least the support layer, the inner flange extending inwardly to the central position to direct the inhaled air, after deflection, to the central position and including a central opening with a surrounding portion conforming and contiguous to the inside surface of the exhalation valve, the surrounding portion of the inner flange being movable away from the inside surface of the exhalation valve, upon the inhalation of air by the user, and thereby forming an inhalation passage between the inside surface of the exhalation valve and the surrounding portion of the central opening of the inner flange to permit the passage of inhaled air to the user.