Patent ID: 6428054
Filing Date: 2002-08-06
Classification: B29C,F16L

Abstract:
Union for double-wall tubes having a first external wall and a second internal wall coaxial with the first external wall to define a chamber around a central duct, the union being a single piece construction and comprising:at least two seats for reception each of one end of a double-wall tube to be connected, each seat comprising a first surface designed to adhere to an exterior surface of an end segment of the first external wall of a double-wall tube inserted in the seat, and a second surface coaxial with the first surface and designed to adhere to an exterior surface of an end segment of the second internal wall of said double-wall tube, at least one first duct to provide connection between the chambers of the double-wall tubes inserted in the seats, at least one second duct which opens into spaces circumscribed by the second surface of each seat to provide connection between the central ducts of said double-wall tubes, a connection surface in each seat connecting the first surface to the second surface of each seat, said at least one first duct opening onto said connection surfaces, and the first and second surfaces of each seat being arranged sequentially in the seat for receiving a double-wall tube with the end of the second internal wall extending beyond the end of the first external wall.