Valves and valve actuation – With correlated flow path – Pipe side
Patent
1997-07-25
1998-09-15
Fox, John
Valves and valve actuation
With correlated flow path
Pipe side
251306, F16K 122
Patent
active
058068309
ABSTRACT:
A molded plastic take-off collar for joining main and branch ducts in forced air heating, cooling, exhaust and ventilation systems having a tubular member with a first end perpendicular flange, and a second end having gripping beads and a stopping edge for attachment to a branch duct. Molded strengthening ribs are formed at the external intersection of the tube and flange; while truncated rims are formed extending from the inner walls of the tube to positively seat a damper flap wherein opposite sides have two protruding threaded pivot pins, which flap can be flexed for insertion of the pins into two opposite openings in the wall of the tube. The damper flap is a unitary structure with the molded pins and molded strengthening beads therefor. A handle and wing nut are provided for positioning the flap. A flexible double-sided adhesive covered ring facilitates joining of the take-off collar to the main duct.
REFERENCES:
patent: 3941151 (1976-03-01), Biddler
patent: 4335738 (1982-06-01), Nassir
patent: 5370360 (1994-12-01), Buchley
Fox John
Holzmann Richard T.
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