# US 10,500,425 B2 · Full hood respirator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,500,425 B2 - Document ID: US10500425B2 - Status: Granted - Kind: B2 - Application number: 14/814,886 - Filed: 2015-07-31 - Published: 2016-02-04 - Granted: 2019-12-10 - Earliest claimed: 2014-08-01 - Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude - Applicants: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude - Inventors: Christian Rolland; Vincent Graziani; Pierrick Cohard; Rachid Makhlouche; Xavier Roussin-Bouchard - Web page: https://patentgrep.com/patent/US10500425B2 ## CPC - A62B 17/04: Hoods - A41D 13/1153: {with a hood} - A41D 13/1184: {with protection for the eyes, e.g. using shield or visor} - A62B 7/14: for high-altitude aircraft - A62B 18/04: Gas helmets - B64D 25/00: Emergency apparatus or devices, not otherwise provided for - B64D 2231/025: Oxygen masks; Mask storages; Features related to mask deployment - A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00) - A41D: OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT ## Abstract Full hood respirator comprising a fluidtight flexible bag intended to be slipped over the head of a user, the flexible bag being provided with a transparent window and comprising, in its lower part, a rigid base element of annular overall shape intended to be positioned around the neck of the user, the base element comprising a tubular oxygen reservoir of pressurized oxygen provided with a calibrated outlet orifice opening into the internal volume of the flexible bag, characterized in that the base element comprises at least two rigid parts connected by an articulation, the two parts being movable relative to one another between a furled first position that prevents a head from entering the hood through the base element and an unfurled position of use that allows a head to enter the hood through the base element. ## Claims ### Claim 1 A full hood respirator comprising a fluidtight flexible bag adapted and configured to be slipped over a head of a user, the flexible bag being provided with a transparent window and comprising, in a lower part of the flexible bag, a rigid base element comprising a tubular oxygen reservoir of pressurized oxygen provided with a calibrated outlet orifice opening into an internal volume of the flexible bag and two rigid curved tubular portions each having first and second ends, the first ends being connected by a ball joint equipped with a male component and a female component, each of the male and female components being situated on a respective one of the two rigid curved tubular portions, the second ends not being connected to one another, the two rigid curved tubular portions lying in a same plane and being pivotally movable relative to one another between, on one hand, a furled orientation of an open elliptical shape that prevents the head of the user from entering the hood through the base element and prevents pressurized gas from the oxygen reservoir from being placed in fluidic communication with the calibrated outlet orifice, and on the other hand, an unfurled orientation of an open ring shape intended to be positioned around a neck of the user and which allows pressurized gas from the oxygen reservoir to be in communication with the calibrated outlet orifice, and which allows the head of the user to enter the hood through the base element. ### Claim 2 (depends on 1) The hood of claim 1, wherein the ring opening formed by the two parts in the unfurled orientation is situated in the region of a front face of the hood, a front face of the hood including the transparent window. ### Claim 3 (depends on 1) The hood of claim 1, wherein the two rigid curved tubular portions of the base element pivot relative to one another at the ball joint between the furled and unfurled orientations through an angular range comprised between thirty and one hundred and eighty degrees. ### Claim 4 (depends on 1) The hood of claim 1, wherein a first of the two rigid curved tubular portions of the base element is a tubular oxygen reservoir and a second of the two rigid curved tubular portions of the base element is a carbon dioxide filter cartridge, the filter cartridge comprising an inlet communicating with the interior volume of the flexible bag and a filtered-air outlet opening into the interior volume of the flexible bag, the outlet orifice of the tubular oxygen reservoir and the filtered-air outlet of the filter cartridge being arranged relative to one another in such a way so as to form a venturi device. ### Claim 5 (depends on 1) The hood of claim 1, wherein the two rigid curved tubular portions of the base element comprise two tubular oxygen reservoirs articulated to one another and having at least one oxygen outlet orifice opening into the flexible bag. ### Claim 6 (depends on 1) The hood of claim 1, wherein the removable plug is situated in a vicinity of the ball joint. ### Claim 7 (depends on 1) The hood of claim 1, wherein the outlet orifice comprises a nozzle directed along a portion of one of the two rigid curved tubular portions. ### Claim 8 (depends on 1) The hood of claim 1, further comprising mechanical stops defining the furled and unfurled orientations. ### Claim 9 (depends on 1) The hood of claim 1, further comprising a removable plug preventing oxygen from the oxygen reservoir from exiting the calibrated outlet orifice when the base element is in the furled orientation and automatically allowing oxygen to exit the oxygen reservoir via the calibrated outlet orifice when the base element is moved from its furled orientation into its unfurled orientation. ### Claim 10 (depends on 9) The hood of claim 9, wherein the removable plug is moved and/or broken mechanically by collaboration with a stop on the hood when the base element is placed into the unfurled orientation from the furled orientation.