Global Patent Index - EP 1061781 A2

EP 1061781 A2 2000-12-20 - Method for providing the electric arc starting point in the electrode of a plasma cutting torch, and electrode thus provided

Title (en)

Method for providing the electric arc starting point in the electrode of a plasma cutting torch, and electrode thus provided

Title (de)

Verfahren zur Erzeugung des Startpunktes vom Lichtbogen in der Elektrode eines Plasma-Schneidbrenners, und Elektrode dazu

Title (fr)

Procédé de réalisation du point de démarrage de l'arc électrique dans l'électrode d'une torche de coupage par plasma, et électrode correspondante

Publication

EP 1061781 A2 (EN)

Application

EP 00110980 A

Priority

IT BO990319 A

Abstract (en)

A method for providing the starting point of an electric arc in an electrode (1) of a thermal plasma cutting torch, comprising the steps of: forming a substantially cylindrical axial seat (3) in the electrode (1), at the end from which the electric arc must start, the seat (3) being adapted to receive, with tolerance, a substantially cylindrical insert (4) made of hafnium or zirconium, and heading the insert (4) inside the seat (3) so as to produce a stable and uniform intimate contact of its outer surface with the inner surface of the seat (3) which is adapted to firmly retain the insert (4) in the seat (3). <IMAGE>

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

H05H 1/34

IPC 8 full level (invention and additional information)

H05H 1/34 (2006.01)

CPC (invention and additional information)

H05H 1/34 (2013.01); H05H 2001/3442 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1061781 A2 20001220; EP 1061781 A3 20021016; IT 1309290 B1 20020122; IT BO990319 A1 20001214; IT BO990319 D0 19990614

INPADOC legal status


2003-05-21 [18W] WITHDRAWN

- Effective date: 20030326

2002-10-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-10-16 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI

2000-12-20 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-12-20 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI