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 portable breathing apparatus for use in a noxious atmosphere includes a helmet that is closed except for a bottom opening that is provided with a neck seal to permit the helmet to be slipped over the head of the wearer while sealing the open bottom of the helmet to provide an airtight enclosure about the wearer's head. A backpack includes a high pressure oxygen cylinder, that is connected to a regulator valve through a pressure reducer; and a carbon dioxide scrubber, that receives expiration g...

A nostril blocker adapted for retained mounting upon the mouthpiece of breathing equipment and comprising a bifurcated resilient element that in use is disposed generally parallel with the mouthpiece gas passage and spaced therefrom by a distance such as to position limbs of the element to straddle the nasal septum and obturate the nostril openings of the user.

An improved breathing apparatus fittable into the mouth of a human between the teeth and cheek is disclosed. The apparatus comprises a tube having a front opening and a back opening and sufficient length to project forward to the front of the lips and rearward down the side of the mouth to a point adjacent the molars; to the end of the tube proximate the exterior of the lips is coupled a curved flange stabilizing means and spaced rearward of the curved flange stabilizing means is curved sealing ...

A breathing apparatus for survival gear is provided by a head receiving hood that is sealed over the head of the user and has sufficient volume to provide breathing air for at least a selected period of time while submerged and is made of a material that prevents the ingress of liquid water while being permeable to the flow of gasses therethrough whereby the supply of oxygen in the hood may be replenished and the carbon dioxide concentration reduced. A suitable waterproof transparent window is f...

Breathing apparatus supplies air or oxygen to a patient and comprises a hand-held housing (10), a gas inlet on the housing, a gas outlet (12) on the housing (10), and a manual/automatic switch (16) on the housing for supplying gas either to a manually operable valve (40) or to a main valve (48) which delivers gas to the outlet on a cyclic basis. A trigger (22) on the housing (10) controls the supply of gas to the outlet through the manually operable valve (40).

A nasal dilator device comprising two molded, rigid, substantially cylindrical insert pieces fixed to each other by a connecting strip at the respective bases thereof. Each insert piece is inserted into a vestibule of the nose to expand the area of the nostril, thereby enhancing breathing.

A breathing mask to be placed on a user's head includes a pressure gas container in the form of one or more closed communicating tubes which form a closed or a open ring adapted to encircle the user's face in front of the user's ears, a sealing member preferably being connected in serial arrangement with a pressure reduction valve and an airtight chamber of the mask.

A breathing valve with a valve disk lying on a valve crater and with a valve spring, which is in contact with the valve disk with a first spring portion and with a support surface with a second spring portion. The valve spring is designed as a valve spring that can be spread open against the support surface, and the support surface is designed as a wedge-shaped spreading surface engaging the second spring portion in the area of contact with the second spring portion.

The present invention provides different size breathing masks in which single size filtration shells are attached to single size face contacting members at the same periphery. A single size face contacting member has one, or more than one size, inner breathing opening with a narrower cut profile in the nose area than in the mouth and chin area. Such different size breathing masks would fit and provide effective seal for more than one wearer's size.