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Patent Searching and Data


Title:
SWITCHABLE EXHALE FILTER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/023933
Kind Code:
A3
Abstract:
A configurable exhale system (10) for a respirator comprises a housing (12) having a chamber (20). A first valve assembly (14) is disposed within the chamber (20) and configured to prevent air from flowing through the first valve assembly (14) when an air pressure differential between an upstream side and a downstream side of the first valve assembly (14) is below a first opening pressure. A second valve assembly (16) is disposed within the chamber (20) in fluid communication with the first valve (assembly 14). The second valve assembly (16) is configured to prevent air from flowing through the second valve assembly (16) when an air pressure differential between an upstream side and a downstream side of the second valve assembly (16) is below a second opening pressure, which is greater than the first opening pressure. A bypass opening is positioned adjacent the second valve assembly (16), which bypass opening configured to enable air to bypass the second valve assembly (16), and a bypass member (62) is positioned adjacent the at least one bypass opening. The bypass member (62) is movable between first and second positions, wherein in the first position the bypass member blocks the at least one bypass opening, and wherein in the in the second position the bypass member does not block the at least one bypass opening.

Inventors:
LANGFORD, Graham (27 Sandham Grove, Heswall,Wirral,Merseyside, CH60 1XN, GB)
Application Number:
GB2013/051974
Publication Date:
November 13, 2014
Filing Date:
July 24, 2013
Export Citation:
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Assignee:
SCOTT HEALTH & SAFETY LIMITED (Pimbo Road, West PimboSkelmersdale,Lancashire, WN8 9RA, GB)
International Classes:
A62B18/10; A62B9/02; A62B7/02
Domestic Patent References:
WO2010131031A22010-11-18
Foreign References:
US20080257352A12008-10-23
US2985169A1961-05-23
US2406888A1946-09-03
US20100236554A12010-09-23
Attorney, Agent or Firm:
HEDGES, Martin Nicholas (A A Thornton & Co, 10 Old Bailey, London EC4M 7NG, GB)
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