FILTERING FACE MASK THAT USES AN EXHALATION VALVE THAT HAS AMULTILAYERED FLEXIBLE FLAP

A filtering face mask that includes a mask body and an exhalation valve. The mask body is adapted to fit at least over the nose and mouth of a wearer to create an interior gas space when worn, and the exhalation valve is in fluid communication with the interior gas space. The exhalation valve compri...

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Bibliographic Details
Main Authors XUE, JIANXIAN, MARTIN, PHILIP G
Format Patent
LanguageEnglish
French
Published 05.06.2003
Edition7
Subjects
ACTUATING-FLOATS
BLASTING
COCKS
DEVICES FOR VENTING OR AERATING
DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
ENGINEERING ELEMENTS AND UNITS
FIRE-FIGHTING
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HUMAN NECESSITIES
LIFE-SAVING
LIGHTING
MECHANICAL ENGINEERING
TAPS
THERMAL INSULATION IN GENERAL
VALVES
WEAPONS
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Summary:A filtering face mask that includes a mask body and an exhalation valve. The mask body is adapted to fit at least over the nose and mouth of a wearer to create an interior gas space when worn, and the exhalation valve is in fluid communication with the interior gas space. The exhalation valve comprises a valve seat that has a seal surface and an orifice through which an exhale fl ow stream may pass to leave the interior gas space. A flexible flap (22) is mounted to the valve seat such that the flap makes contact with the seal surface when the valve is in its closed position and such that the flap can flex away from the seal surface during an exhalation to allow exhaled air to pass through the orifice to ultimately enter an exterior gas space. The flexible flap has at least first (44) and second (46) juxtaposed layers wher e at least one of the layers is stiffer or has a different elastic modulus tha n the other layer.
Bibliography:Application Number: CA20022466481