Self-tapping duct fitting

Details Self-tapping duct fitting Self-tapping duct fitting

1982-06-01

1985-01-01

Arola, Dave W.

Stoves and furnaces

Dampers

Stovepipe

29157T, 29513, 285158, 285424, 408204, F23L 1100

Patent

active

044911246

ABSTRACT:
A self-tapping duct fitting (10) in the form of a hollow sleeve having an interrupted cutting edge (20) at a one end (14) so that a hole (68) can be cut in a wall (66) of the duct by a rotative motion of the fitting. Preferably, the interrupted cutting edge (20) includes a plurality of teeth (22) which can form tabs bendable against the inner surface (72) of the duct wall (66) once a hole (68) has been cut in order to retain fitting (10) in place.

REFERENCES:
patent: 3290066 (1966-12-01), Primich et al.
patent: 3349792 (1967-10-01), Larkin
patent: 3354808 (1967-11-01), Maccrow
patent: 3477745 (1969-11-01), Williams et al.
patent: 3609056 (1971-09-01), Hougen
patent: 3722499 (1973-03-01), Lukjan
patent: 3726545 (1973-04-01), Grim et al.
patent: 3915477 (1975-10-01), Timmons

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