Pipes and tubular conduits – Combined – With end structure
Patent
1994-10-24
1995-10-31
Scherbel, David
Pipes and tubular conduits
Combined
With end structure
138155, 138120, 138DIG4, 285405, 285363, F16L 2300, F16L 2500
Patent
active
054620899
ABSTRACT:
Rectangular sheet metal duct sections with integral outwardly-and-rearwardly formed end flanges are conventionally made from coiled strip metal to lengths provided by the width of the coil stock, ordinarily slightly less than five feet. As is common practice, outward-and-reverse facing flanges are formed on both ends of each wall of the duct section. The spaces between the flange ends at the corners of the duct section are filled by heavier cornerpieces having arms projecting at right angles. Crimping the outstanding flanges over the corner arm portions completes a duct section. According to the present invention, a linear array of embossed surface portions is formed in the duct wall close to each outwardly projecting flange portion and beneath its reverse-facing portion. Manually inserting and pressing the cornerpiece arms to lodge their inner edges between the line provided by these embossed portions and the adjacent first flange portions, supports each cornerpiece in its position for subsequent crimping thereover of the reverse flange portions.
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DW/141 Specification for sheet metal ductwork, p. 20, FIG. 76 Iowa Precision-"Install T.D.C. Corners The Easy Way" advertisement.
Engel Industries, Inc. v. The Lockformer Company, et al., "Findings of Fact and Conclusions", entered Jul. 21, 1994, Finding No. 19, Cause No. 86-212-C(4).
Brinson Patrick F.
Engel Industries, Inc.
Gross Jerome A.
Scherbel David
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