FILTERING HALF-MASK FOR PROTECTION AGAINST AEROSOLS AND DUST Russian patent published in 2015 - IPC A62B18/00 

FIELD: personal use articles.

SUBSTANCE: invention relates to personal protective respiratory equipment and represents a disposable filtering half-mask that may find wide application both in production and household as well as for medical purposes for protection of human respiratory organs against substances detrimental to health in the form of aerosols and dust which mask is folded and placed into a flat bag during storage. The half-mask has a nose clamp and cheek ear fixing tongues that have identical lateral surfaces, with area equal to approximately 8-10 cm², and are positioned on projecting expansions on the lateral sides of the flat sections of the flanges in the form of a rectangle having rounded transitions on the base part of the half-mask that has an attachment strip with a single knot; then put on, the strip may be transformed into two strips to ensure adjustment of strapping of the user's head cervical and vertex parts; the outline of the half-mask base part is bonded along the obturation line with a weld seam with the help of stroke lines while the seam connecting the two parts of the blank is positioned within the chin zone. According to the second version of the half-mask, the latter contains a base part (designed so that to be able to cover the user's mouth and nose), cheek ear fixing tongues with holes, an attachment strip with a single knot, a nose clamp (positioned between layers of unwoven cloth of the half-mask base part, fixed with a U-shaped frame and made of two aluminium threads coated with plastic shell) and an expiration device positioned at the cheek level on the right and on the left side and consisting of the expiration valve seat, a protective screen serving for directing exhaled air flow away from the user's eyes and a membrane attached to the expiration valve seat.

EFFECT: reduction of expiration resistance which in its turn ensures tightness of the space under the mask along the obturation stripe.

5 cl, 8 dwg