A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
109/1, 137/1.52
A62B 11/00 (2006.01) E05G 1/00 (2006.01)
Patent
CA 1112980
Abstract of the Disclosure A vault or strongroom includes unitary and self- contained equipment for providing life-support within the sealed vault-enclosure. The carbon-dioxide content of the atmosphere within the enclosure is monitored and a pump is operated if the monitored value exceeds a predetermined value, typically 1% or 2%. Operation of the pump pumps air of the atmosphere through material that absorbs carbon dioxide and this, together with operation of a fan to circulate air in the enclosure is continued until the monitored content has been reduced, typically to 0.5%. Oxygen (or air) is released from cylinders for replacing the absorbed carbon dioxide and maintaining an oxygen level of about 18% or 19% in the enclosure. Release of oxygen is regulated by a valve device to maintain a variable - pressure (or oxygen level) - of the atmosphere within the enclosure substantially constant or within predetermined limits. The pump is operated concurrently with release of the oxygen.
320616
Chubb & Son's Lock And Safe Company Limited
Fetherstonhaugh & Co.
LandOfFree
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