EP 0095413 A3 19840912 - PRESTRESSING DUCTS AND METHODS FOR THEIR MANUFACTURE

Title (en)

PRESTRESSING DUCTS AND METHODS FOR THEIR MANUFACTURE

Publication

EP 0095413 A3 19840912 (FR)

Application

EP 83400993 A 19830517

Priority

FR 8208902 A 19820521

Abstract (en)

[origin: ES279984U] To manufacture a bent prestress conduit (5) adapted to receive without damage cables (7) subjected to extremely high pulling forces, one of the faces of a metal strip (1) is coated intimately with a metal phosphate layer (4) itself covered by a soap and this metal strip is wound in helical form so as to obtain a continuous tube whose inner face is formed by the thus coated face of the metal strip.

IPC 1-7

E04C 5/10; B21C 37/12

IPC 8 full level

B21C 37/12 (2006.01); E04C 5/10 (2006.01)

CPC (source: EP US)

B21C 37/126 (2013.01 - EP US); E04C 5/10 (2013.01 - EP US)

Citation (search report)

[A] FR 1587229 A 19700313
[A] FR 2118861 A7 19720804 - SOC GEN ENTREPRISES
[A] CH 99464 A 19230616 - SECHEHAYE EMILE [CH]
[A] DE 1103108 B 19610323 - STEFAN KLINGHOFFER DR
[A] DE 2161105 A1 19730620 - HOESCH MASCHINENFABRIK AG

Designated contracting state (EPC)

AT BE CH DE GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0095413 A2 19831130; EP 0095413 A3 19840912; EP 0095413 B1 19860416; AT E19280 T1 19860515; DE 3363027 D1 19860522; ES 279984 U 19841116; ES 279984 Y 19850601; FR 2527246 A1 19831125; FR 2527246 B1 19850104; US 4606380 A 19860819

DOCDB simple family (application)

EP 83400993 A 19830517; AT 83400993 T 19830517; DE 3363027 T 19830517; ES 279984 U 19830518; FR 8208902 A 19820521; US 74103785 A 19850604