Method of kerfing insulation boards and duct liners and the like

Details Method of kerfing insulation boards and duct liners and the like Method of kerfing insulation boards and duct liners and the like

1995-09-14

1999-09-21

Bryant, David P.

Metal working

Method of mechanical manufacture

Gas and water specific plumbing component making

298973, B23P 1500

Patent

active

059538180

ABSTRACT:
Ducts are formed from rigid or semi-rigid insulation boards by forming a plurality of longitudinally extending, spaced apart, parallel kerfs in a first major surface of each of the insulation boards which is adapted to be the interior surface of the duct. When the insulation board is formed into a duct of the preselected dimensions, the shoulders of the kerfs adjoining the interior surface of the duct abut and, preferably, the insulation material in the shoulders of the kerfs is compressed. The flexibility of the insulation boards, in the direction of the widths of the insulation boards, is controlled by increasing the depths and/or the widths of the kerfs and/or decreasing the spacing between the kerfs to make the insulation board more flexible and by decreasing the depths and/or the widths of the kerfs and/or increasing the spacing between the kerfs to make the insulation board less flexible.

REFERENCES:
patent: 3605534 (1971-09-01), Barr
patent: 4411183 (1983-10-01), Auer
patent: 4576206 (1986-03-01), Lauren
patent: 4823845 (1989-04-01), Martin et al.
patent: 4838968 (1989-06-01), Nelson
patent: 5024131 (1991-06-01), Weidman
patent: 5134917 (1992-08-01), Holland
patent: 5232762 (1993-08-01), Ruby
patent: 5310594 (1994-05-01), Holland et al.
patent: 5567304 (1996-10-01), Schakel et al.

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