Lindab Ab

Protol A.g.

Lindab Aktiebolag

Kenneth Lennartsson

Carl-Gustaf Sonden

Lars-&angst;ke Mattsson

Sten H&ouml;gman

Carl-Gustaf Sond&eacute;n

Pontus Andersson

Tomas Persson

Lars Stefansson

Lars-Ake Mattsson

Lars-&angst;ke Mattss&ouml;n

A flanged coupling ring for a duct element has a mounting section configured to be mounted or a connection portion of the duct element, and flange means extending outwards from the mounting section. The flange means has, along its periphery, flanged coupling portions for connecting two duct elements, each of which is provided with a coupling ring, by means of external coupling means configured to engage with the flanged coupling portions.

Coupling ring for ventilation ducts, and method of connecting ventilation ducts

Coupling ring for ventilation ducts

In a method for producing helically wound lock-seam tubing, a metal strip is fed to a forming head in which the tubing is formed. In order to frictionally interlock this lock seam, a flexible string is inserted into and compressed in the lock seam during manufacture.

Helically wound lock seam tube

In a method for producing helically wound lock-seam tubing, a metal strip is fed to a forming head in which the tubing is formed. In order to prevent lock-seam slip, a clinching roller device form interlocking spaced deformations on the lock-seam. An apparatus for such production comprises a clinching roller provided with a recess for forming the deformations against a counter roller.

Helically wound lock-seam tube

Sealing rings for ventilation ducts

A tubular element has a sealing ring mounted at an end of the tubular element. The sealing ring has a base clamped against the outer surface of the tubular element. Further, the sealing ring has a sealing lip adapted to seal against an inner surface of an outer tube, in which the tubular element is inserted. The base is disposed in a groove that is formed in the wall of the tubular element. The sealing ring has a further lip that is positioned adjacent to the end of the tubular element and that is bent down and clamped against the base by means of the end portion, thereby providing secure fastening of the sealing ring. The sealing ring is fastened by a method involving bending of the end portion of the tubular element together with the further lip.

Tubular element with sealing means and a method for manufacturing the tubular element

Method and apparatus for producing helically wound lock-seam tubing

In a method for producing helically wound lock-seam tubing, a metal strip is fed to a forming heed in which the tubing is formed. In order to prevent lock-seam slip, a clinching roller device forms interlocking spaced deformations on the lock-seam. An apparatus for such production comprises a clinching roller provided with a recess for forming the deformations against a counter roller.

Circular sleeve coupling

Growing community of inventors

Torekov, Sweden

Kenneth Lennartsson