Surgery – Respiratory method or device – Including body or head supported means covering user's scalp
Patent
1996-05-22
2000-03-07
Lewis, Aaron J.
Surgery
Respiratory method or device
Including body or head supported means covering user's scalp
12820523, B63C 1102
Patent
active
060326646
ABSTRACT:
A self contained breathing apparatus has a display of air pressure within the face mask in the field of vision of the user of the breathing apparatus. The display is four lights that indicate the four quarter-tanks of pressure, and the lights change to indicate the amount of air remaining. A transducer receives tank pressure and provides an electric signal. The air pressure is placed on a bourdon tube which rotates a disk in response to changes in pressure. One half of the disk includes a gradient, and a light source emits light through the gradient to be received by a light sensor. As the disk rotates, the gradient varies the amount of light received by the sensor, so the electrical output of the sensor varies.
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Gray Robert E.
Hiltman Paul D.
Lewis R. David
Speck Victor
International Safety Instruments, Inc.
Lewis Aaron J.
Middleton James B.
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