| 主权项 |
1. A resistance breathing device, comprising:
a face mask having an interior surface, an exterior surface opposite said interior surface, an aperture extending through said face mask from said exterior surface to said interior surface, and a perimeter, wherein said face mask is adapted to overlay a user's mouth and nose such that said perimeter forms an air-tight seal with the user's face and around the user's mouth and nose and said face mask defines an internal area between said interior surface of said face mask and the user's face; an outer layer overlaying said face mask and having a pair of straps with inter-engaging ends for affixing said face mask about the user's face; an insert plate having an interior surface, an exterior surface opposite said interior surface of said insert plate, and at least one inlet aperture extending therethrough, said insert plate being disposed within said aperture of said face mask, said aperture of said face mask forming an air-tight seal around said insert plate; a central insert including an interior surface, an exterior surface opposite said interior surface of said central insert, and at least one inlet aperture extending therethrough, said central insert overlaying said insert plate such that said interior surface of said central insert faces said exterior surface of said insert plate and such that at least a portion of said at least one inlet aperture of said central insert overlays said at least one inlet aperture of said insert plate, said central insert being movable with respect to said insert plate between at least a first position and a second position, wherein when said central insert is in said first position, a first portion of said at least one inlet aperture of said central insert overlays said at least one inlet aperture of said insert plate, and wherein when said central insert is in said second position, a second portion of said at least one inlet aperture of said central insert overlays said at least one inlet aperture of said insert plate, said second portion of said at least one inlet aperture of said central insert being larger in size than said first portion of said at least one inlet aperture of said central insert; and an air exhaust valve assembly adapted to prevent air from passing therethrough from an external environment to said internal area, said at least one air exhaust valve assembly being adapted to allow air to pass therethrough from said internal area of said face mask to the external environment. |
