Gas separation – Combined or convertible
Patent
1991-04-15
1991-12-03
Nozick, Bernard
Gas separation
Combined or convertible
144252R, 30133, B01D 5000
Patent
active
050696955
ABSTRACT:
A tent-free technique, system, and apparatus for effecting protection of humans from airborne asbestos and other particulate contamination is disclosed. It comprises a first transparent cowling means operatively associated with drilling means and at least one filtration unit flow connected therewith. The first cowling means comprises two members slidably disposed relative to one another, with the first member thereof being more or less substantially fixed relative to the drilling means housing and the second member adapted to be more or less substantially fixed temporarily to the plane of the material first engaged by the drill bit. A second cowling means, also flow connected to said filtration unit, is operatively associated with the instant apparatus and more or less substantially fixed temporarily to the plane of the material lastly engaged by said drill bit. A third cowling means is operatively associated with sawing means and fixed relative to the housing thereof and adapted for enclosing the saw blade. The cowlings can be made and retrofitted into existing drills and/or saws. The drill with first cowling member attached is positioned relative to said second member and inserted thereinto and the drill bit is properly positioned by means of the transparent nature of the resulting composite first cowling. Said second cowling means is placed onto the desired location on the opposite side of the material to be drilled, usually by hand holding effected by the drill operator helper and the drilling operation is commenced. The sawing means is utilized with said third cowling attached and with said second cowling in place on the opposite side of said material.
REFERENCES:
patent: 4063478 (1977-12-01), Stuy
patent: 4921375 (1990-05-01), Famular
Nozick Bernard
Petrusek Robert A.
Tennessee Valley Authority
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