Anti-parabolic anti-folding structure of gas mask sealing frame
A parabolic, gas mask technology, applied in the direction of breathing masks, respiratory protection containers, life-saving equipment, etc., can solve the problems of poor comfort, poor air tightness, etc., to improve the wearing comfort, improve the wearing comfort, and the protection factor does not decrease Effect
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[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0017] An anti-parabolic anti-folding structure of a gas mask airtight frame, such as figure 1 As shown, the reversing edge of the close-fitting frame is composed of a forehead part 1 , a temple part 2 , a cheek part 3 and a jaw part 4 which are left and right symmetrical.
[0018] The forehead part 1 is concave and anti-parabolic, and its cross-sectional shape is expressed as y=0.05x 2 -3.3x+45, the value range of x is determined according to the actual situation, usually (0~15).
[0019] The temple part 2 is concave anti-parabolic, and its cross-sectional shape is expressed as y=0.014x 2 -2x+39, the value range of x is determined according to the actual situation, usually (10~40).
[0020] The cheek part 3 is concave and anti-parabolic, and its cross-sectional shape is expressed as y=0.015x 2 -2x+35, the value range of x is determined ac...
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