Apparatus for supplying oxygen to a user

摘要

An apparatus for supplying oxygen to a person at a mine site upon the depletion of atmospheric oxygen or the filling of the air with smoke or dust particles or poisonous fumes comprising a helmet having a visor shiftably mounted thereon for normally assuming an out-of-use position and for assuming an in-use position over the face of a user upon manipulation thereby. An oxygen-containing vessel is attached to a belt worn by the user, with a conduit connected at one end to the vessel and at the other end to the visor for forming a gas-guiding channel between the vessel and a space formed between the face of the user and the visor upon a shifting thereof into the in-use position. A gas-flow control on the vessel for enabling communication between the vessel and the conduit includes a narrow gas-conducting duct and a broad gas-conducting duct, the gas-flow control further including an initialization valve normally blocking the broad duct and an actuator operatively connectable to the valve for temporarily unblocking the broad duct upon a shifting of the visor into the in-use position, a tension member extending through the conduit along the length thereof from the visor to the gas-flow control for actuating same.