Breathing equipment
First Claim
1. Breathing equipment of the kind which includes a breathing hood (1) intended to surround the wearer'"'"'s head (2), an inner mask (3) which covers at least the wearer'"'"'s mouth and nose, a breathing gas delivery conduit (4), means (6, 7) which permit gas to pass from the hood (1) to the mask (3), and check valve means (5) for allowing gas to pass from the mask (3) to the surroundings when the overpressure in the mask has reached a given value, characterized by the combination of that the breathing gas is delivered to the hood (1) and that said means (6, 7) allow gas to pass in both directions between hood (1) and mask (3);
- and further characterized in that said means (6,
7) requires a lower overpressure in the mask (3) for passage of gas from the mask to the hood than the pressure required for the check valve (5) to release gas to the surroundings.
3 Assignments
0 Petitions
Accused Products
Abstract
Breathing equipment including a breathing hood to surround a wearer'"'"'s head. An inner mask covers at least the wearer'"'"'s mouth and nose. The equipment includes a breathing gas delivery conduit and structure to permit gas to pass from the hood to the mask. A check valve allows gas to pass from the mask to the surroundings when overpressure in the mask has reached a given value. The breathing gas is delivered to the hood and the gas passing structure permits gas to pass in both directions between the hood and the mask. The gas passing structure requires a lower overpressure in the mask for passage of gas from the mask to the hood than the pressure required for the check valve to release gas to the surroundings.
37 Citations
8 Claims
-
1. Breathing equipment of the kind which includes a breathing hood (1) intended to surround the wearer'"'"'s head (2), an inner mask (3) which covers at least the wearer'"'"'s mouth and nose, a breathing gas delivery conduit (4), means (6, 7) which permit gas to pass from the hood (1) to the mask (3), and check valve means (5) for allowing gas to pass from the mask (3) to the surroundings when the overpressure in the mask has reached a given value, characterized by the combination of that the breathing gas is delivered to the hood (1) and that said means (6, 7) allow gas to pass in both directions between hood (1) and mask (3);
- and further characterized in that said means (6,
7) requires a lower overpressure in the mask (3) for passage of gas from the mask to the hood than the pressure required for the check valve (5) to release gas to the surroundings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- and further characterized in that said means (6,
Specification