Safes – bank protection – or a related device – Combined
Patent
1979-01-31
1980-09-30
Yuen, Henry C.
Safes, bank protection, or a related device
Combined
109 1V, 236 49, B64D 1300
Patent
active
042248612
ABSTRACT:
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 oyxgen level)--of the atmosphere within the enclosure substantially constant or within predetermined limits. The pump is operated concurrently with release of the oxygen.
REFERENCES:
patent: 1786277 (1930-12-01), West
patent: 1805332 (1931-05-01), Gross
patent: 2500775 (1950-03-01), Stewart
patent: 2545194 (1951-03-01), Colburn et al.
patent: 3011718 (1961-12-01), Joerren et al.
patent: 3165147 (1965-01-01), Roof et al.
patent: 3401619 (1968-09-01), Sotory
patent: 3509810 (1970-05-01), Riester
patent: 4164172 (1979-08-01), Anderten et al.
Chubb & Son's Lock and Safe Company Limited
Yuen Henry C.
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