PANORAMIC MASK WITH ANNULAR MEMBRANE VALVE Russian patent published in 2009 - IPC A62B18/00 

FIELD: protection means.

SUBSTANCE: invention is related to means of individual protection of respiratory organs and organs of sight. Panoramic mask comprises body made of transparent plastic with inhalation valves and panoramic glass, rubber obturator, assembled valve box, inner mask with inhalation valves, fixation belts. Valve box consists of valve-communicating unit, annular membrane expired valve in the form of annular membrane from elastic material and cover. Inner mask is arranged with side wings. Panoramic glass has opening with diametre D=77-81 mm in lower part, sight part of glass is arranged in the form of cylinder with external radius R=77-83 mm, arranged at the angle to vertical line B=18°-22°, and has width C=163-173 mm, length L=95-105 mm and height relative to axis of hole for installation of valve box downwards H1 =54-60 mm and upwards H2=113-123 mm. Inner mask wings are arranged at the angle of A=23°-27° and have the following dimensions: length L_K=38-44 mm, width B_k=16-20 mm and front curvature radius R_K=21-27 mm.

EFFECT: invention provides for development of ergonomic mask with overall field of view of not less than 84%, compact location of composite parts and small distance from face surface to provide for unimpeded motions with head.

2 cl, 4 dwg