Patent ID: 6812427
Filing Date: 2004-11-02
Classification: B23K

Abstract:
A rolling head for a resistance seam welding machine comprising: a stator; an annular electrode constituting the rotor rotatably mounted on the stator and coaxial therewith for rotation about an axis; a device for conducting electricity through a sliding contact, positioned between the stator and the rotor and pressed against at least one of them by an elastic force; and conduits through which a coolant flows in the stator, in the rotor and in the sliding contact conductive device; wherein the sliding contact conductive device comprises at least one elastically yielding element forming a radial sector, positioned between the stator and the rotor and designed to remain permanently in contact with the stator and the rotor so as to conduct electrical current from one to the other, wherein the elastically yielding element extends from an end that is connected to one of said stator and rotor to a free end that slidably contacts the other of said stator and rotor under resilient biasing force generated by said elastically yielding element due to its elasticity and its extension along a path that winds around said axis, and wherein the elastically yielding element is shaped like at least one spiral arc.