Pipes and tubular conduits – Combined – With end structure
Patent
1993-09-24
1994-10-25
Scherbel, David A.
Pipes and tubular conduits
Combined
With end structure
138155, 138120, 138DIG4, 285405, 285363, F16L 2300, F16L 2500
Patent
active
053580133
ABSTRACT:
Modifying that type of integral flange outstanding from a sheet metal duct characterized by an outstanding first width of sheet metal and a second substantially equal width bent reversedly back to extend at 180.degree. from the first, in the present flange a sheet edge margin is bent reversedly back and inwardly between the second and first such widths. As compared to prior art flanges, this results in substantially lessened deflections under internal duct pressures without appreciable increase in sheet metal used. An added advantage is that the sheet metal edge is positioned so that it cannot endanger workmen's hands.
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HVAC Duct Construction Standards, Metal and Flexible, First Ed. 1985 Published by: Sheet Metal and Air Conditioning Contractors National Association, Inc., Vienna, Va. 22180, pp. 1-25; Table 1-12.
DW/141, Specification for Sheet Metal Ductwork, Low and High Velocity Pressure Air Systems, Published by: Heating and Ventilating Contractors' Association, 1977, pp. 16, 17 and 20; p. 16, FIG. 55; p. 17, FIGS. 58, 59 and 60; p. 20, FIG. 73.
Brinson Patrick F.
Engel Industries, Inc.
Gross Jerome A.
Scherbel David A.
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