A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
137/1.5
A62B 7/00 (2006.01) A62B 18/04 (2006.01) G01L 9/00 (2006.01)
Patent
CA 1307441
ABSTRACT OF THE DISCLOSURE A powered respirator is provided with a device sensitive to the pressure within the respirator in the region of the user's face and adapted to sound a warning in the event that the sensed pressure goes below a selected threshold value. The device includes a flexible diaphragm exposed on its opposite sides to the sensed and atmospheric pressures respectively, and an infra red emitter and receiver arranged so that the level of energy received by the receiver from the emitter depends upon the flexural position of the diaphragm. In different embodiments the diaphragm may be arranged to reflect the radiation from the emitter onto the receiver or not, or to interrupt a beam of radiation from the emitter to the receiver or not, depending on the pressure differential across it. In either case, when a sufficient energy level is detected at the receiver, indicating a pressure level below the selected threshold, power is switched to a sounder to warn the user of the low pressure condition.
603733
Edwards David Brian
Fetherstonhaugh & Co.
The Minnesota Mining & Manufacturing Company
LandOfFree
Powered respirators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Powered respirators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Powered respirators will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1170869