Patent ID: 6494234
Filing Date: 2002-12-17
Classification: B65G,F16L

Abstract:
A pipe bend for a pipeline for transporting abrasive materials such as sand or concrete, comprising:a pair of coupling collars including an outer ring, which has an outer circumferential anchoring groove, and an inner ring mounted in the outer ring and secured therein against displacement in axial direction, wherein the inner ring is made of a material which is more wear-resistant than a material of the outer ring; an arcuate outer pipe portion extending between the coupling collars and having one end, which is welded to the outer ring of one of the coupling collars, and another end which is welded to the outer ring of the other one of the coupling collars, wherein the outer pipe portion has an inner diameter which is greater than an inner diameter of the outer rings of the coupling collars; and an arcuate inner pipe portion extending at a radial distance to the outer pipe portion between the inner ring of one of the coupling collars and the inner ring of the other one of the coupling collars, wherein the inner pipe portion is made of a material which is more wear-resistant than a material of the outer pipe portion, wherein the inner pipe portion has opposite ends of an inner cross section, which is in coaxial alignment to an inner cross section of the inner rings, for radial support upon the outer pipe portion, wherein the inner ring of each coupling collar is mounted to the outer ring between an inwardly directed shoulder at one end of the outer ring and a radially inwards directed constraint at another end of the outer ring.