Global Patent Index - EP 1053065 A1

EP 1053065 A1 2000-11-22 - METHOD FOR PRODUCING PIPES TO BE CONNECTED IN A DOUBLE-WALL PIPING SYSTEM AND IMPLEMENTING MACHINE

Title (en)

METHOD FOR PRODUCING PIPES TO BE CONNECTED IN A DOUBLE-WALL PIPING SYSTEM AND IMPLEMENTING MACHINE

Title (de)

VERFAHREN ZUM HERSTELLUNG VON ROHREN ZUM VERBINDEN IN EINES DOPPELWANDIGE ROHRSYSTEMS UND VORRICHTUNG ZUR HERSTELLUNG

Title (fr)

PROCEDE DE REALISATION DE TUYAUX A RACCORDER DANS UNE CANALISATION A DOUBLE PAROI ET MACHINE POUR SA MISE EN OEUVRE

Publication

EP 1053065 A1 (FR)

Application

EP 99958278 A

Priority

  • FR 9903064 W
  • FR 9815491 A

Abstract (en)

[origin: FR2786713A1] The invention concerns a method for producing pipes to be connected in a double-wall piping system and a machine for implementing said method which consists in butt-jointed connection in a double wall piping system. Each pipe (1) comprises an inner tube (10) and an outer tube (20) in a relatively coaxial position providing between them an annular gap (31) up to a connection zone (2) at the pipe end where the outer tube is located longitudinally recessed from the inner tube. The method consists in deforming the outer tube (20) end part (3) by restricting its diameter until its contiguous end (presenting a weld seam closely adjusted with a provisional wedge) with the inner tube (10) for closing the annular gap (31), by operating concentrically with gradual pressure on its wall by means of a series of bars (42) annularly distributed around the connection zone (2) and by causing them to tilt over in a radial direction from a ring (43) fixed relatively to the outer tube whereon they are mounted articulated.

IPC 1-7 (main, further and additional classification)

B21D 39/04; F16L 3/14

IPC 8 full level (invention and additional information)

B21D 39/04 (2006.01); B21D 41/04 (2006.01)

CPC (invention and additional information)

B21D 41/04 (2013.01); B21D 39/048 (2013.01); Y10T 29/49879 (2013.01); Y10T 29/49913 (2013.01); Y10T 29/5367 (2013.01)

Citation (search report)

See references of WO 0033990A1

Designated contracting state (EPC)

GB IT

EPO simple patent family

FR 2786713 A1 20000609; FR 2786713 B1 20010216; BR 9907707 A 20001114; EP 1053065 A1 20001122; EP 1053065 B1 20030709; NO 20003982 A 20000807; NO 20003982 D0 20000807; NO 318202 B1 20050214; US 6446321 B1 20020910; WO 0033990 A1 20000615

INPADOC legal status


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