Patent ID: 6279664
Filing Date: 2001-08-28
Classification: A62C

Abstract:
A portable fire extinguisher, comprising:a pressure gauge;a tank having fire-extinguishing contents under pressure, said tank in communication with said pressure gauge;a Bourdon coiled tubing disposed within said pressure gauge, said Bourdon coiled tubing movable by a change in pressure within said tank, said Bourdon coiled tubing having a non-reflective portion and a reflective portion;a beam transmitter/receiver positioned at said pressure gauge for producing a transmittable beam directed upon said Bourdon coiled tubing at a point where said non-reflective portion of said Bourdon coiled tubing is positioned in front of said beam when said tank is adequately pressurized thereby not reflecting said beam to said transmitter/receiver, and when said Bourdon coiled tubing rotates to a position caused by low pressure within said tank, said reflective portion of said Bourdon coiled tubing is then positioned in front of said beam, reflecting said beam back to said beam transmitter/receiver;means for sensing a change in said beam's reflection when said tank reaches a state of low pressure and for producing a signal to indicate said state of low pressure; andmeans for directing said produced signal over a line to a remote location to indicate a low-pressure situation in said tank.