发明名称 |
RESPIRATOR FACE MASK |
摘要 |
<p>The mask is held by four support buttons and two straps attached having a reverse leverage pulldown effect to pull the mask into contact with the facial area. A concave configured sealing diaphragm on the exhalation valve provides a uniform opening with less effort than is normally encountered in such valves. A staggered anti-inversion rib on the concave underside of the exhalation valve prevents the diaphragm from inverting to a convex configuration. The valve includes an exhalation valve stack and vent that can be covered at a sharply chamfered opening to provide for a pressure fit test. The inhalation port features two unique chamfered exterior rings which mate with a reverse chamfered cartridge. The inhalation valve is mounted on the threaded connector so as to form a slightly concave configuration to minimize the objectionable popping sound.</p> |
申请公布号 |
GB2176407(B) |
申请公布日期 |
1987.06.03 |
申请号 |
GB19860014481 |
申请日期 |
1986.06.13 |
申请人 |
* U S D CORPORATION |
发明人 |
JAMES N * MATHESON;PHILIP L * LOWRY |
分类号 |
A62B18/00;A62B18/02;A62B18/08;A62B18/10;F16K15/14;(IPC1-7):A62B18/02 |
主分类号 |
A62B18/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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