Crew oxygen mask with improved comfort control apparatus

A - Human Necessities – 62 – B

Patent

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Details

A62B 18/08 (2006.01)

Patent

CA 2315870

Inflatable harness respiratory apparatus (10) is provided having an improved comfort control assembly (16) allowing reduction in the engagement force exerted by the fitting surface (20) of the mask (12) against the face of the user. The mask (12) is equipped with an inflatable hamess strap element (26) having terminal ends (28, 30) supported on stationary, tubular mask mounts (36) via housing assemblies (38). In one embodiment, the terminal ends (28, 30) are releasably locked onto the mounts (36) by means of locks (52), but are axially shiftable along the length of the mounts (36) in order to adjust the effective distance between the fitting surface (20) and the terminal ends (28, 30). An adjustment button (78) may be depressed in order to disengage the locks (52) and permit shifting of the associated terminal end (28, 30). Alternately, an intermediate comfort position is pneumatically achieved by controlled pressurization of an internal cavity (128) within the housing assembly (88).

La présente invention concerne inhalateur (10) à harnais gonflable pourvu d'un ensemble régulateur (16) à confort accru permettant de réduire la force de contact qu'exerce sur le visage de l'utilisateur la surface de contact (20) du masque (12). Le masque (12) est équipé d'un élément en bande (26) du harnais gonflable dont les extrémités terminales (28, 30) sont supportées via des ensembles carters (38) par des montures de masque (36) fixes et stationnaires. Selon l'une des réalisations, les extrémités terminales (28, 30) sont fixées libérables aux montures (36) au moyen de fixations (52), mais elles sont capables d'un coulissement axial le long des montures (36) de façon à régler la distance effective entre la surface de contact (20) et les extrémités terminales (28, 30). On peut appuyer sur un bouton de réglage (78) pour dégager les fixations (52) et permettre le coulissement de l'extrémité terminale associée (28, 30). Selon une autre réalisation, on réalise par effet pneumatique une position de confort intermédiaire en établissant une pressurisation contrôlée d'une cavité interne (128) à l'intérieur de l'ensemble carter.

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