초록 ▼

A breathing apparatus includes a regulator which delivers air to a user wearing a mask. The regulator is connected to the mask through an adaptor. The adaptor includes an exhalation valve which enables the user's breath to pass out of the adaptor to atmosphere. The regulator includes a sensing diaph

A breathing apparatus includes a regulator which delivers air to a user wearing a mask. The regulator is connected to the mask through an adaptor. The adaptor includes an exhalation valve which enables the user's breath to pass out of the adaptor to atmosphere. The regulator includes a sensing diaphragm that is movable responsive to pressure in the mask. A main valve delivers air to the mask responsive to opening of a pilot valve. The pilot valve includes a pilot opening. A lever moves in response to the sensing diaphragm to open the pilot opening which causes flow through the main valve. Air from the main valve is also delivered to a positive pressure chamber. Pressure in the positive pressure chamber moves a positive pressure diaphragm which causes a positive pressure spring to biasingly engage the sensing diaphragm. The biasing of the sensing diaphragm causes the regulator to maintain a positive pressure in the mask. Positive pressure is discontinued by relieving pressure form the positive pressure chamber by manually actuating a vent valve.

대표청구항 ▼

1. A breathing apparatus for supplying air at positive pressure responsive to a user's breathing efforts, comprising: a mask; a body, the body including a sensing chamber and a positive pressure chamber therein, the sensing chamber in fluid communication with the mask; a first movable member bound

1. A breathing apparatus for supplying air at positive pressure responsive to a user's breathing efforts, comprising: a mask; a body, the body including a sensing chamber and a positive pressure chamber therein, the sensing chamber in fluid communication with the mask; a first movable member bounding the sensing chamber, wherein the first member moves in response to pressure in the mask; an air delivery valve in operative connection with the first member, the delivery valve having an outlet, wherein air is delivered to the outlet responsive to movement of the first member to an air delivery position, and wherein the outlet is in fluid communication with both the mask and the positive pressure chamber; a check valve in intermediate fluid relation between the valve outlet and the positive pressure chamber, wherein the check valve enables flow only from the outlet to the positive pressure chamber; and a second movable member bounding said positive pressure chamber, wherein the second member moves in a first direction responsive to delivery of air to the positive pressure chamber, and wherein the second member is in operative connection with the first member, wherein movement of said second member in the first direction is operative to bias the first member towards the air delivery position.