Patent ID: 6948709
Filing Date: 2005-09-27
Classification: B21D

Abstract:
1. An expansion lance assembly for an expansion of a hollow profile by the exertion of a fluidic high internal pressure comprising: a rod-shaped seal carrier detachably connected to a carrier holder and having a seal arrangement including at least two sealing rings each having an outside diameter which is larger than an inside diameter of the hollow profile and at least one spacer sleeve situated between the at least two sealing rings and arranged on the seal carrier, the seal carrier having an axial inflow bore connected to a fluid high-pressure source and at least one transverse bore branching off from the axial inflow bore and the seal arrangement having an axial end support situated remote from the carrier holder; wherein each of the sealing rings includes a first component and a second component; the first component including a low-abrasion high-pressure-resistant elastomer ring which bears against a circumferential surface of the seal carrier such that it is elastically deformable axially by high internal pressure from the pressure source, the second component including a high-pressure-resistant supporting ring which is radially elastic and axially has a high tensile strength, wherein the elastomer ring includes, on a side facing away from a nearest transverse bore, a peripheral shoulder on which the supporting ring is mounted, the peripheral shoulder being enclosed by the supporting ring, and the seal carrier and an axial stop being arranged on the peripheral shoulder.