Knock-down duct collar

Details Knock-down duct collar Knock-down duct collar

1975-08-21

1977-03-01

Callaghan, Thomas F.

Pipe joints or couplings

End to side or plate

285158, 285424, F16L 4100

Patent

active

040098958

ABSTRACT:
For use in connecting flexible air-carrying ducts into rectangular sub-floor ducts, a knock-down collar, easily installed in the field, possesses sufficient rigidity to withstand the compression of a draw band by which a flexible duct is secured. Field assembly is by means of a drive cleat over 180.degree. flanges of the collar workpiece; tabs outstanding from the bends resist the hoop compression. A ring of inward-bent trapezoidal segments forms a flange presentable upwardly against the edge surface around an opening in a sub-floor duct with their tips bent upward and back to secure to such opening.

REFERENCES:
patent: 540827 (1895-06-01), Avery
patent: 1982498 (1934-11-01), Cornell
patent: 2703110 (1955-03-01), Curtis
patent: 2963783 (1960-12-01), Field
patent: 3290066 (1966-12-01), Primich et al.

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