Otangular fitting family for flat-oval duct systems and method f

Details Otangular fitting family for flat-oval duct systems and method f Otangular fitting family for flat-oval duct systems and method f

1996-09-19

1999-03-09

Scherbel, David

Pipes and tubular conduits

Longitudinally seamed

Sectional

138109, 138117, 138177, 138DIG4, 137875, 285424, F16L 917

Patent

active

058787860

ABSTRACT:
An apparatus for converting a conventional rectangular HVAC duct to a flat oval shaped duct where a conventional rectangular duct fitting is provided with a converting means to convert the opening from rectangular to a flat oval. The converting means is formed by a pair of arcuate members defining semi-circular edges and having recesses to receive portions of parallel members. The apparatus utilizes two sheet metal pieces which are formed in arcuate contours that connect between flat edges of parallel sheets to form the oval shape.

REFERENCES:
patent: 590374 (1897-09-01), Osburn
patent: 1374866 (1921-04-01), Spencer
patent: 1881679 (1932-10-01), Klomparens
patent: 2216864 (1940-10-01), Wasmund
patent: 2359725 (1944-10-01), Berger et al.
patent: 2825431 (1958-03-01), Molt
patent: 3965933 (1976-06-01), Beaudin
Pipe and Duct Work, Meyer and Brothers, Jul. 1938, pp. 4-8.

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