Abstract: In an arrangement for connecting tube elements of a ventilation duct system, the inner tube (3) has an abutment (7?) for engagement with a matching abutment (8?) of the outer tube (1). By insertion of the inner tube (3) into the outer tube (1), the abutments (7?, 8?) are brought into engagement in a plane (P) perpendicular to the direction of insertion for providing coupling between the abutments and thereby connection of the tubes (1, 3). The abutment (7?) of the inner tube (3) is continuous along the circumference of the tube (3) and is provided at a distance (d) from a free end (20) of the inner tube (3).

Abstract: In an arrangement for connecting tube elements of a ventilation duct system, the inner tube (3) has an abutment (7) for engagement with a matching abutment (8) of the outer tube (1). By insertion of the inner tube (3) into the outer tube (1) the abutments (7, 8) are brought into engagement in a plane (P) perpendicular to the direction of insertion for providing coupling between the abutments and thereby connection of the tubes (1, 3). The abutment (7) of the inner tube (3) is continuous along the circumference of the tube (3) and formed in a bent end portion (20) of the inner tube (3).

Abstract: An assembly system for coupling a first pipe element (2) and a second pipe element (3) has a circumferential clamping device (5) to be applied on the outside of the ends of the pipe elements and to be tightened around the same when the two pipe elements (2, 3) are placed end-to-end. The system also has a coupling device (6) to be arranged between the ends of the first and the second pipe elements (2, 3) and beneath the circumferential clamping device (5), so as to align and/or hold the two pipe elements (2, 3) during the assembly. A method of coupling a first pipe element (2) and a second pipe element (3) is also disclosed, as well as a coupling device (6) and use of the assembly system (1).

Abstract: A pipe connection for use in a ventilating duct system having ducts with circular cross-section is adapted to be inserted with a close fit into an outer pipe and be connected therewith. The pipe connection has a circumferential groove, in which a circumferential seal sealing against the inside of the outer pipe is arranged. A terminal edge portion of the pipe connection comprises an outer conical portion which has a diameter decreasing towards the end of the pipe connection, and a circumferential guide surface having such a diameter that said close fit is obtained. The axial length (L3) of the terminal edge portion constitutes about 1.5-5.5% of the diameter of the guide surface. The outer conical portion at its end has a diameter which constitutes about 97-99.9% of the diameter of the guide surface.

Abstract: 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.

Abstract: A device for coupling together pipes, which at their end have an outwardly directed bead, comprises an annular clamping strap (1) and a clamping mechanism (4-6) arranged at the ends (2a, 2b) of the clamping strap. Between the ends (2a, 2b) of the clamping strap (1), a sealing element (7) is arranged for sealing the joint between the ends (2a, 2b).

Abstract: In a method of coupling a first pipe with a second pipe having a circumferential bead, use is made of an annular clamping band which is applied on the outside of the end beads and is tightened around the end beads when the pipes are placed end to end. The clamping band has on its inside a sealing ring, which is arranged against the end beads. A first recess of the sealing ring is formed on and held on the outside of the end bead of the first pipe in such a manner that a second recess of the sealing ring is arranged axially outside this end bead. The second recess of the sealing ring is then formed on the end bead of the second pipe, and finally the clamping band is tightened around the end beads with the sealing ring placed between the clamping band and the end beads.