US4889113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hood for protecting against smoke and hypoxia
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1987-04-20
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Granted: 1989-12-26
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Expires: 2007-04-20
Abstract
Abstract The invention relates to a hood for protecting against smoke and hypoxia which is of use more particularly in the protection of flying personnel in aircraft. This hood comprises, at its base and within the fluidtight cover a closed tube (3) surrounding the neck of the wearer and containing a reserve supply of oxygen under pressure, and means (11-13) for automatically putting, when the hood is donned, the interior of this tube in communication with an automatic supply of oxygen to the wearer of the hood.
Inventors
- 👤 Pierre Pelloux-Gervais
- 👤 Richard Zapata
- 👤 Michel Bres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:33
CPC Classifications
A; A62; A62B; A62B17/00; A62B17/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
251 words
A helmet for protecting against smoke or hypoxia, comprising inner and outer gas tight flexible covers, said inner cover being substantially transparent in a place adapted to register with a wearer's eyes, said inner cover being adapted to enclose the head of a wearer and said outer cover enclosing a portion of the exterior surface of said inner cover, said covers thus constituting a hood adapted to cover the head of the wearer, said hood having, in its lower part, sealing means adapted to connect the hood to the neck of the wearer, said helmet further including breathable gas supply means attached thereto, said portion of said inner cover and said outer gas tight flexible cover being secured together along their edges to define between them a first volume, while said inner cover and said sealing means define a second volume, said portion of said inner cover being interrupted in at least one region so as to define in this portion at least one opening through which said first and second volumes communicate with each other to allow the breathable gas to go back and forth through said opening, said covers being adaptable to move towards and away from each other according to a breathable gas demand from the wearer, making said first volume adapted to vary according to the wearer's inhalations and/or exhalations, porous filter means being placed in each of said openings for absorbing carbon dioxide and/or water from the breathable gas during its travel back and forth therethrough.
Claim 2
Dependent Claim
251 words
A helmet for protecting against smoke or hypoxia, comprising inner and outer gas tight flexible covers, said inner cover being substantially transparent in a place adapted to register with a wearer's eyes, said inner cover being adapted to enclose the head of a wearer and said outer cover enclosing a portion of the exterior surface of said inner cover, said covers thus constituting a hood adapted to cover the head of the wearer, said hood having, in its lower part, sealing means adapted to connect the hood to the neck of the wearer, said helmet further including breathable gas supply means attached thereto, said portion of said inner cover and said outer gas tight flexible cover being secured together along their edges to define between them a first volume, while said inner cover and said sealing means define a second volume, said portion of said inner cover being interrupted in at least one region so as to define in this portion at least one opening through which said first and second volumes communicate with each other to allow the breathable gas to go back and forth through said opening, said covers being adaptable to move towards and away from each other according to a breathable gas demand from the wearer, making said first volume adapted to vary according to the wearer's inhalations and/or exhalations, porous filter means being placed in each of said openings for absorbing carbon dioxide and/or water from the breathable gas during its travel back and forth therethrough.
Claim 3
Dependent Claim
17 words
A helmet according to claim 1, wherein said porous filter means is a cartridge containing soda lime.
Claim 4
Dependent Claim
23 words
A helmet according to claim 1, wherein it further comprises removable closing means for automatically communicating said gas supply means with said helmet.
Claim 5
Dependent Claim
25 words
A helmet according to claim 1, further comprising a detachable closing means to activate the supply of breathable gas from the breathable gas supply means.
Claim 6
Dependent Claim
55 words
A helmet according to claim 1, comprising as said breathable gas supply means, at its lower part, a closed tube adapted to surround at least partly the neck of the wearer and containing a reserve supply of oxygen under pressure, and means to supply oxygen from said tube to at least one of said volumes.
Claim 7
Dependent Claim
33 words
A helmet according to claim 5, in which the tube has the form of a split ring, and transverse walls by which the tube is closed at its two ends facing each other.
Claim 8
Dependent Claim
93 words
Protective helmet according to claim 5, in which the tube containing the oxygen under pressure comprises two separate compartments and said means to supply oxygen including flow control means controlling the flow of oxygen from each of said compartments, said flow control means respectively offering two different resistances to the flow of gas therethrough, thereby permitting obtaining a feed of oxygen with two different flow rates, namely, a high initial flow rate to obtain rapid filling of the helmet, then a lower flow rate corresponding to the normal oxygen consumption of the wearer.
Claim 9
Dependent Claim
68 words
Protective helmet according to claim 7, in which the tube contains a transverse partition separating it into the two compartments and end walls, said flow control means including a capillary hole through said partition, a hole through one of said end walls, said capillary hole being of smaller diameter than said hole through said one end wall of the tube, and removable closure means closing the last-named hole.
Claim 10
Dependent Claim
15 words
Protective helmet according to claim 8, wherein the removable closure means is a rupturable nipple.
Claim 11
Dependent Claim
105 words
Protective helmet according to claim 8, in which the other end wall is opposite to the one wall having the last-named hole and has a central recess, a capillary tube which extends through the bottom of said central recess, one end of said capillary tube opening into the interior of the tube, the other end of the capillary tube is closed and extends exteriorly of said tube in the form of a helix which is axially deformable as a function of the pressure prevailing in the interior of the tube, thereby to constitute a manometer indicating the residual pressure in the interior of the tube.
Claim 12
Dependent Claim
75 words
A helmet according to claim 1, wherein it further comprises a lever pivotally mounted on the helmet about an axis and having leg means that extends into the interior of the helmet and being adapted to be pressed by the wearer's head when donning the helmet causing said lever to pivot, and valve means actuatable by pivoting of the lever in order to communicate breathable gas from the breathable gas supply means to said helmet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |