A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
137/1.54
A62B 7/10 (2006.01) A62B 18/00 (2006.01)
Patent
CA 1218579
ABSTRACT Improvements in and relating to Breathing Apparatus A power assisted respirator comprises a facepiece for covering at least the/ nose and mouth of the wearer which has an outlet provided with a one-way exhale valve which is openable to permit air to flow out of the face- piece when a predetermined pressure P is established within the facepiece. A pump unit supplies air to the space within the facepiece. The pump unit may be connected to an inlet of the facepiece by a flexible hose or may be mounted directly on or in the face- piece. A filter canister is connected to the inlet of the pump means for filtering air supplied to the facepiece. A one-way inlet valve is provided in the path of air flowing from the pump unit to the face- piece and a pressure sensor is provided for sensing the pressure of air in the region of the pump unit inlet for causing deenergisation of the pump unit when the pressure in the region of the pump unit inlet exceeds a predetermined level. The operating parameters of the pump of the pump unit and the exhale valve are selected so that the pressure within the facepiece at which the exhale valve will open slightly exceeds the pressure at the outlet of the pump which will cause the pump to cease/or substantially ceaseoperating effectively. Thus in use, during exhalation the pressure within the facepiece will rise to a level at which the inlet valve will close causing a build-up of pressure at the pump outlet which will cause the pump to cease operating effectively. Meantime the exhale valve will open. During normal operation of the pump, because of the resistance to flow provided by the filter canister, the pressure in the region of the pump inlet will be sub-atmospheric. The pressure sensor is arranged to sense a rise in this pressure resulting from the pump ceasing/or substantially ceasing to operate effectively and will cause deenergisation of the pump. The reduction in pressure within the facepiece at the start of inhalation, which is communicated to the pump, is sensed by the pressure sensor which then causes reenergisation of the pump.
456016
Sim & Mcburney
The Minnesota Mining & Manufacturing Company
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