Fume duct joint with clamping collar

Details Fume duct joint with clamping collar Fume duct joint with clamping collar

1998-09-16

1999-10-05

Arola, Dave W.

Pipe joints or couplings

With assembly means or feature

Molded joint facilitator

285 24, 285328, 285371, 285422, 285423, 285915, 156 92, 156158, 156330, F16L 1310

Patent

active

059611545

ABSTRACT:
A fume exhaust duct joint, a clamping collar for clamping two cylindrical dual-laminate duct sections joined by an internal slip collar, and a method for assembling the joint. A first embodiment of the clamping collar has two clamp portions each including a metal outer skin spot-welded to a metal inner skin. The inner skins have bifurcated protrusions whose bifurcations penetrate the duct section outer surfaces when the collar is tightened, and, optionally, two circumferential beads of fire retardant caulking. The inner skins and slip collar are bonded to duct section surfaces using a putty-like sealant including a settable admixture of curing agent and novolac epoxy resin. A second embodiment of the clamping collar, preferred for duct sections 3-inches in diameter or smaller, has a single circumferential clamp portion.

REFERENCES:
patent: 2273398 (1942-02-01), Couty et al.
patent: 3982779 (1976-09-01), Hickey
patent: 4150848 (1979-04-01), Dyrup
patent: 5234234 (1993-08-01), Hearn
patent: 5298299 (1994-03-01), shea
patent: 5505497 (1996-04-01), Shea et al.
patent: 5549949 (1998-08-01), Williams et al.

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