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 Title: |
US4905683:
Respirator mask for positive pressure respirator equipment
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Cronjaeger, Ralf; Lubeck, Germany
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| Assignee: |
Dragerwerk Aktiengesellschaft, Lubeck, Germany
other patents from DRAGERWERK AKTIENGESELLSCHAFT (154005) (approx. 595)
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| Published / Filed: |
1990-03-06
/ 1987-07-10
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| Application Number: |
US1987000073909
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| IPC Code: |
Advanced:
A62B 18/02;
A62B 18/04;
A62B 27/00;
Core:
A62B 18/00;
more...
IPC-7:
A61L 10/00;
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| U.S. Class: |
Current:
128/202.22;
128/206.24;
128/207.12;
Original:
128/202.22;
128/206.24;
128/207.12;
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| Field of Search: |
128/201.23,206.24,202.72,201.75
073/040,40.7,40.5 R,49.2,49.8,52
012/201.28,204.26,205.12,205.13,205.17,205.25, 206.12,207.12
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| Priority Number: |
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| Abstract: |
A respirator mask for positive pressure respirator equipment comprises several peripheral seal edges around the face of the mask wearer. It must be assured that in case of possible leaks of the seal edges no respiratory gas, in particular respiratory gas with increased oxygen concentration, escapes into the open. To check that there are no leaks of respiratory gas past the seal edges, one of the sealing cavities defined by the seal edges in the mask is connected to a connecting line. This cavity defines a control chamber. A flow indicating device is connected to the connecting line and is placed so that it is visible to the wearer. A valve is positioned in a part of the mask bounding the interior of the control chamber. The valve can be actuated to permit the flow of gas, for example exhaled gas, into the control chamber and out through the connecting line and flow indicating device. The wearer can determine what a normal flow value should be and, if the flow observed on the flow indicating device falls below this value, it is assumed that a leak has developed.
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| Attorney, Agent or Firm: |
McGlew & Tuttle ;
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| Primary / Asst. Examiners: |
Hindenburg, Max; Reichle, K. M.
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
This application is a continuation of application Ser. No. 843,103, filed Mar. 24, 1986, now abandoned.
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| Family: |
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First Claim:
Show all 7 claims |
What is claimed is:
1. A respirator mask comprising: a half mask having an interior engageable over the nose and mouth of a wearer and having a peripheral resilient seal edge engageable on the wearer's face and a respiratory air connecting piece leading out of the said half mask, said connecting piece communicating with said half mask interior; an outer full mask body over said half mask, said outer full mask body being sealed with the connecting piece, said outer full mask body having an outer peripheral seal edge resiliently engageable around and sealable about the wearer's face and an inner seal edge engageable around and sealable with the wearer's face, said full mask body having a front wall with a viewing window through which the wearer can see when wearing the respirator mask, said full mask body defining a first chamber between said full mask body outer peripheral seal edge and said full mask body inner seal edge and said full mask body cooperating with said half mask to define a second chamber between said full mask body inner seal edge and said half mask seal edge; a connecting line having one end connected into one of said first chamber and said second chamber and discharging into the ambient, said connecting line extending out of said full mask body and past said viewing window, said connecting line also having a discharge end spaced away from said viewing window for the discharge into the ambient; a flow indicator in said connecting line adjacent said viewing window for indicating a flow which can be seen by the wearer when wearing the respirator mask; and, valve means for opening and closing communication between said respiratory air connecting piece and said one of said first chamber and said second chamber so that respiratory air may pass into said one of said first chamber and said second chamber and through said connecting line to influence said flow indicator.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 33 U.S. patent(s) that reference this one
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