Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Patent
1997-10-22
1999-03-16
Briggs, William R.
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
29781, 72 49, B23P 3700
Patent
active
058814426
ABSTRACT:
In an apparatus for producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically wound together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
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Brochure, LindabSilencer, Lindab Ltd., 1988.
Hultberg Kent
Ranta Teuvo
Briggs William R.
Lindab AB
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