Title: Machine for manufacturing insulated duct

Abstract: A machine is provided for making flexible tubular insulated duct having multiple wraps formed about a compressible inside core. A sheet forming collar shapes the wraps about the core upstream of a joint sealer which cooperates with an underlying conveyor to draw the core and wrap materials along a linear path of movement through the joint sealer to form a longitudinally extending joint on the outermost wrap of the duct. A second conveyor overlies the first conveyor downstream of the joint sealer, and the second conveyor and the joint sealer are selectively adjustable in height to form duct of selected diameter size and to apply a desired tractive force to the sealed duct. A cutting unit is selectively operable downstream of the second conveyor for cutting the duct into predetermined lengths.

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Inventors: Rejeski, William E. (Farmington, CT, US)
Perusse, Norman J. (Farmington, CT, US)

Application Number: 521657
Filing Date: 1974-11-07
Publication_date: 1976-04-13
Assignee: The Wiremold Company (West Hartford, CT)
Primary Class(es): 156/461 156/144, 156/203, 156/468
Other Classes:
US Patent Ref:

2697473	Dec, 1954	Techtmann	156/443.
2906317	Sep, 1959	Keyes	156/218.
3220320	Nov, 1965	Brigham	93/80.
3528159	Sep, 1970	Miles	93/80.
3627615	Dec, 1971	Guiles et al.	156/466.
3816043	Jun, 1974	Snelling	425/112.

Other Refs:
Primary Examiner: Powell, William A.
Assistant Examiner: Simmons, David A.
Attorney: Prutzman, Hayes, Kalb & Chilton