发明名称 |
Apparatus for making a double-walled structure |
摘要 |
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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申请公布号 |
US5881442(A) |
申请公布日期 |
1999.03.16 |
申请号 |
US19970955654 |
申请日期 |
1997.10.22 |
申请人 |
LINDAB AB |
发明人 |
HULTBERG, KENT;RANTA, TEUVO |
分类号 |
B21C37/12;F01N13/18;F16L9/16;F16L59/14;F24F13/02;F24F13/24;(IPC1-7):B21C37/00 |
主分类号 |
B21C37/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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