Abstract: An inhalation apparatus comprising an automatic pressure regulator including a body having an opening for receiving the valve of an oxygen tank and an outlet for a hose extending from the outlet. A valve is attached to the hose and includes a manual control for selectively varying the volume of oxygen passing through the hose to an inhaling mask on the end of the hose. The pressure regulator body includes two chambers, a passage extending from one chamber to the other, and an inlet passage extending to one chamber. Each chamber has a diaphragm closing one wall thereof and a spring yieldingly urging the diaphragm in one direction. An orifice is associated with the inlet and an orifice is associated with the passage. A lever is pivoted adjacent its respective diaphragm and has one end thereof pivotally connected to its respective diaphragm and the other end thereof engaging a valve associated with the respective orifice.

Abstract: An inhalation apparatus comprising an automatic pressure regulator including a body having an opening for receiving the valve of an oxygen tank and an outlet for a hose extending from the outlet. A valve is attached to the hose and includes a manual control for selectively varying the volume of oxygen passing through the hose to an inhaling mask on the end of the hose. The pressure regulator body includes two chambers, a passage extending from one chamber to the other, and an inlet passage extending to one chamber. Each chamber has a diaphragm closing one wall thereof and a spring yieldingly urging the diaphragm in one direction. An orifice is associated with the inlet and an orifice is associated with the passage. A lever is pivoted adjacent its respective diaphragm and has one end thereof pivotally connected to its respective diaphragm and the other end thereof engaging a valve associated with the respective orifice.