Surgery – Truss – Pad
Patent
1974-11-11
1976-05-18
Michell, Robert W.
Surgery
Truss
Pad
128203, 137DIG9, 137110, A62B 704
Patent
active
039570444
ABSTRACT:
A Self-Contained Breathing Apparatus with automatic redundant fluid pressure controls and a facemask mounted low pressure warning device. The apparatus utilizes two stages of pressure regulation wherein the final stage is the demand regulator that delivers the breathing gas to the wearer. The first state includes a pair of pressure regulators connected in parallel with different outlet pressures, both of which reduce the pressure of the stored supply gas to pressures compatible with the second stage breathing demand regulator. A primary regulator in the first stage delivers a low output pressure to the second stage demand regulator. In the event of a "failure closed" condition of the primary regulator an automatic transfer valve switches on the backup regulator and communicates its slightly higher outlet pressure to the demand regulator. A warning that the supply pressure has been depleted to a predetermined low level is also provided by a supply pressure actuated transfer valve which transfers the output of the first stage pressure regulators from the primary to the backup regulator thereby activating a whistle alarm device in the facemask to which the demand regulator is also mounted. The whistle is activated by the higher outlet pressure from the backup regulator during the inhalation phase of each breath in either of the two events of a "failure closed" condition of the primary regulator or the depletion of the supply pressure to a dangerously low level.
REFERENCES:
patent: 2854001 (1958-09-01), Humblet
patent: 3190287 (1965-06-01), Miller, Jr.
patent: 3481356 (1969-12-01), McQueen
patent: 3508542 (1970-04-01), Browner
patent: 3742972 (1973-07-01), Hughes
Fletcher James C. Administrator of the National Aeronautics and Space
Giorgini Eugene A.
Simmonds Milo R.
Sullivan John L.
Manning John R.
Marnock Marvin J.
Matthews Marvin F.
Michell Robert W.
Recla Henry J.
LandOfFree
Self-contained breathing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-contained breathing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-contained breathing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2228840