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 Title: |
US3822698:
POWERED AIR-PURIFYING RESPIRATOR HELMET
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Guy, Richard E.; Baytown, TX 77520
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| Assignee: |
None
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| Published / Filed: |
1974-07-09
/ 1973-01-22
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| Application Number: |
US1973000310724
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| IPC Code: |
Advanced:
A62B 18/04;
Core:
A62B 18/00;
IPC-7:
A61F 9/06;
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| U.S. Class: |
Current:
128/201.25;
002/424;
Original:
128/142.7;
002/003.R;
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| Field of Search: |
128/142.7,142.6,142.4,142,145,146.3
002/3 R,5,171.3,171.4,183
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| Priority Number: |
| 1973-01-22 |
US1973000310724 |
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| Abstract: |
A helmet or hat equipped with a built-in powered air blower and air filtering system which removes contaminants from the surrounding air and continuously delivers the purified air under positive pressure to an area between the wearers face and a fitted transparent face shield supported from the visor, and from this area the wearer breathes normally while the excess filtered air and exhaled breath escapes through a slightly restricted opening between the bottom of the mask and the wearer's chin.
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| Primary / Asst. Examiners: |
Gaudet, Richard A.; Recla, Henry J.
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| Family: |
None
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First Claim:
Show all 11 claims |
I claim:
1. A positive pressure filtered air respirator device comprising:
- a dome shaped element having a visor;
- a face shield having its upper edge attached and sealed to said visor, said face shield including means for engaging the side edges thereof to a wearer's face to form seals therewith and means for permitting a slightly restrictive air passage from the lower edge thereof whereby the shield is sealed around its periphery except for a small opening adjacent the wearer's chin;
- a generally dome shaped air filter element fitted adjacently to, but slightly spaced from, the inside surface of the helmet and generally co-extensive therewith;
- means for securing and substantially sealing the filter element to the helmet adjacent the periphery thereof to form a first generally dome shaped space therebetween;
- a dome shaped impermeable member fitted adjacent to, but slightly spaced from, the underside surface of the filter element and generally co-extensive therewith;
- means for securing the impermeable member to the filter element and the helmet to form a second generally dome shaped space between the impermeable member and the filter element;
- means for providing fluid communication between the second generally dome shaped space and the interior of said shield;
- an electrically driven air blower secured to the helmet;
- means providing an inlet air passage for fluid communication between the ambient and the blower; and
- means providing an outlet air passage for fluid communication between the blower and the first generally dome shaped space, whereby ambient air passes through the inlet passage to the blower, through the outlet passage to the first generally dome shaped space, through the filter element to the second generally dome shaped space, to the interior of the face shield and out through the slightly restrictive air passage at the bottom of the face shield, thereby causing a slightly higher air pressure in the interior of the face shield than the ambient.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 49 U.S. patent(s) that reference this one
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