Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Patent
1979-07-31
1981-02-17
Gilden, Leon
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
126280, 126307R, 2940203, 2940209, 2940219, 29507, 138DIG10, 138139, 138 93, B23P 1700, F23J 1100, F24C 1514
Patent
active
042506093
ABSTRACT:
A flue stack maintenance system particularly for those flues through which grease laden air passes such as for example exist in commercial restaurant kitchens and the like (FIG. 1), which utilizes an expandible, elongated metal foil liner bag which forms a closed interior system except for an air inlet conduit provided for the application into the interior of the bag an air pressure greater than the ambient to balloon out the bag into facing engagement with the interior of the flue stack (FIG. 3B). After the bag is ballooned out, the upper and lower ends are opened and folded over and around the ends of the flue for attaching the foil liner to the flue (FIG. 3C). After the liner becomes laden with deposits of grease and the like, it is removed by sealing off the distal end and closing off the proximate end around a vacuum hose which applies to the interior of the liner a negative or vacuuming pressure below the ambient, which causes the liner to collapse inwardly for its easy removal from the flue stack (FIGS. 4A and 4B) to be replaced with a new liner bag. The liner bag is made from for example an aluminum foil sheet folded over in half unto itself and sealed along its mating edges with the air inlet conduit extending through one edge (FIGS. 2A and 2B). Longitudinal and lateral expansion folds can be included in the bag structure, exemplary folds being accordian type (FIGS. 6 and 7) and Z-Type folds (FIGS. 5 and 8). A liner bag having two separable liner walls allowing for separate removing of the inner liner leaving the outer liner with the flue is also disclosed (FIG. 9).
REFERENCES:
patent: 1860855 (1932-05-01), Gardner
patent: 2809664 (1957-10-01), Vollmar, Jr.
patent: 2970042 (1961-01-01), Lagerwey
patent: 3247581 (1966-04-01), Pellizzari
patent: 4043132 (1977-08-01), Zupanick
Gilden Leon
Rising V. K.
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