EP 1266704 A1 20021218 - Method and apparatus for producing helically wound lock-seam tubing and helically-wound lock-seam tube
Title (en)
Method and apparatus for producing helically wound lock-seam tubing and helically-wound lock-seam tube
Title (de)
Methode und Vorrichtung zum Herstellen von gefalzten Schraubennahtrohren und Schraubennahtrohr
Title (fr)
Méthode et dispositif de fabrication de tubes à agrafage hélicoidal et tube à agrafage hélicodal
Publication
Application
Priority
- EP 96906144 A 19960306
- SE 9501750 A 19950512
- US 40075295 A 19950308
Abstract (en)
In a method for producing helically wound lock-seam tubing, a metal strip is fed to a forming head in which the tubing is formed. In order to prevent lock-seam slip, a flexible, friction-enhancing string (47) is inserted in the lock-seam (37). An apparatus for such production comprises also a clinching assembly for clinching mutually engaged edge portions (16) of the metal strip, to form the lock seam (37) of the tubing. The invention also relates to a helically-wound lock-seam tube. <IMAGE>
IPC 1-7
IPC 8 full level
B21C 37/12 (2006.01); B21D 39/02 (2006.01)
CPC (source: EP)
B21C 37/121 (2013.01)
Citation (search report)
- [X] FR 996496 A 19511219
- [XA] US 1479201 A 19240101 - NAYLOR CARL G
- [XA] DE 1452446 B1 19700312 - SIEGWART EMIL
- [DA] GB 2213748 A 19890823 - SPIRO MACHINES SA [CH]
- [A] DE 1082567 B 19600602 - MUELLER & CO KG
- [A] DE 34871 C
- [A] EP 0527413 A1 19930217 - WITZENMANN METALLSCHLAUCHFAB [DE]
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE
DOCDB simple family (publication)
WO 9627455 A1 19960912; AT E229850 T1 20030115; AU 4961296 A 19960923; CA 2214493 A1 19960912; CA 2214493 C 20060502; CN 1077463 C 20020109; CN 1177935 A 19980401; CZ 282697 A3 19990414; CZ 293154 B6 20040218; DE 69625525 D1 20030130; DE 69625525 T2 20030904; DK 1015145 T3 20030407; EP 1015145 A1 20000705; EP 1015145 B1 20021218; EP 1266704 A1 20021218; ES 2187636 T3 20030616; HU 223347 B1 20040628; HU P9801707 A2 19981130; HU P9801707 A3 20000628; JP H11501256 A 19990202; NO 312017 B1 20020304; NO 974074 D0 19970904; NO 974074 L 19971027; PL 179477 B1 20000929; PL 322144 A1 19980105
DOCDB simple family (application)
SE 9600292 W 19960306; AT 96906144 T 19960306; AU 4961296 A 19960306; CA 2214493 A 19960306; CN 96192419 A 19960306; CZ 282697 A 19960306; DE 69625525 T 19960306; DK 96906144 T 19960306; EP 02014515 A 19960306; EP 96906144 A 19960306; ES 96906144 T 19960306; HU P9801707 A 19960306; JP 52680796 A 19960306; NO 974074 A 19970904; PL 32214496 A 19960306