Respirator with hinged visor

Details Respirator with hinged visor Respirator with hinged visor

2003-04-11

2004-07-20

Dawson, Glenn K. (Department: 3761)

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

C128S201240, C128S205270, C128S205290

Reexamination Certificate

active

06763830

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of the Invention
The invention relates to respirators. In one of its aspects, the invention relates to a respirator that is foldable along a vertical axis for storage. In another of its aspects, the invention relates to a respirator that has an optical visor that spans a face piece and is foldable about a vertical axis.
2. Description of the Related Art
U.S. Pat. No. 2,737,659, issued Mar. 13, 1956 to Glidden, discloses an optical gas mask with a pair of separate framed lenses that are separated by a longitudinally extending strip of flexible material from the mask for flexing of the mask along a longitudinal line between lenses to adjust the mask to different faces. The rims and flexible material cut down on the field of view for the mask.
SUMMARY OF INVENTION
A gas mask according to the invention comprises a facepiece defining an interior chamber for filtered air and including at least one inhalation opening for passage of filtered air from the atmosphere to the interior chamber and a filtration canister removably mounted to the facepiece and in fluid communication with the at least one inhalation opening for passage of purified atmospheric air to the facepiece interior chamber and an opening spanning a front portion of facepiece. A visor comprising an optical panel is mounted in the opening in the front portion of the facepiece for user visibility through the facepiece. A hinge joins opposite sides of the visor along a vertical line for relative rotational movement of the opposite sides of the optical panel and the facepiece with respect to each other.
In one embodiment, the hinge is integrally formed with the visor. In another embodiment, the hinge is a mechanical hinge. In yet another embodiment, the hinge is formed by welding.


REFERENCES:
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