A surface breathing vent device for a mask permits the user wearing the mask to breathe ambient air prior to diving under water or entering an oxygen-poor environment and includes a support plate couplable to the mask and provided with an opening in alignment with the com port of the face mask, a bushing provided in the opening, and a vent barrel received in the bushing and movable between an open position in which ambient air can pass into the mask and a closed position where water is prevented...

An improved breathing regulator for a scuba diver comprises an integrated exhaust assembly having as the only removable part thereof a fastened cover for gaining access to the exhaust valve. The housing and integrated exhaust assembly reduce the cost of manufacture and increase the reliability and safety of the breathing regulator by obviating the prior art detachable exhaust tee.

A demand regulator for use in underwater breathing employs a deflector carried by a valve operating lever for movement between the air outlet in the breathing chamber and the mouthpiece tube to reduce the portion of air supplied directly to the mouthpiece as the air flow is increased.

A breathing apparatus is disclosed which fits into the mouth of a human between the teeth and cheeks. The apparatus functions to direct air from the front of the mouth to the back of the mouth and from there to the lungs. The apparatus features a ported curved tube which is open-ended and which has sufficient length to extend from the rear of the mouth on one side of the mouth along a path following the tooth line from one set of molars to the other and on to the rear of the mouth on that other ...

The venturi action in a demand regulator is controlled by moving a baffle across an air inlet into the regulator chamber as the inlet valve is opened.

The present invention concerns closed circuit breathing apparatus comprising a mask having inhalation and exhalation ducts in communication with a regenerator for regenerating exhaled air. A source of air under pressure is connected to the closed circuit so as to feed unused air into the circuit in such a manner as to draw regenerated air to the mask and to maintain a slight over pressure.

A breath warming apparatus which comprises a flexible, lightweight casing in the shape of a curved, generally symmetrical horn of expanding cross section, having a flared internal chamber containing metal mesh. This mesh will retain the heat and expired moisture of the wearer and will in turn warm and humidify the air being inhaled through the device. A mouthpiece, designed to minimize resistance to airflow to and from the oral cavity, provides the immediate aperture through which the user breat...

A portable, emergency breathing apparatus is provided that comprises an elastomeric bladder adapted to receive an emergency supply of pressurized oxygen-containing gas; valve means adapted to inject the oxygen-containing gas into the elastomeric bladder; conduit means providing gaseous fluid communication between the elastomeric bladder and a mouthpiece; and valve means adapted to control the flow of the oxygen-containing gas from the elastomeric bladder through the conduit to the mouthpiece.

A breathing apparatus removably mounted in a housing has a device for processing the breathing gas. This device includes a container and a charge for processing the breathing air which is disposed in the container. The container has air pass-through openings at least one of which is closable with a stopper. The breathing apparatus provides an indication of possible entry of water vapor and this indication is limited to only the water-vapor sensitive parts of the breathing apparatus. For this pur...

A breathing mask has an elastic molded body which has area zones of materials of different hardnesses. This breathing mask is improved such that even with a one-piece molded configuration of the breathing mask, area zones of different hardness and constant wall thickness are provided. For this purpose, area zones integrated into the molded body are reinforced differently by means of a partial heat treatment.