Torch with rotational start

Details Torch with rotational start Torch with rotational start

2005-04-19

2005-04-19

Walberg, Teresa J. (Department: 3742)

Electric heating

Metal heating

By arc

C219S121520

Reexamination Certificate

active

06881921

ABSTRACT:
A plasma arc torch has a threadless electrode-cathode locking assembly, a one-piece tip assembly, and a rotational contact starting mechanism. The cathode and electrode of the locking assembly are configured such that relative rotation of the electrode with respect to the cathode causes the electrode to move in an axial direction relative to the cathode for locking the electrode in fixed axial and rotational position with respect to the cathode. The inner wall of the one-piece tip assembly is configured to receive the forward end of the electrode in a non-contact position. Rotation of the electrode with respect to the tip causes an arcing formation on the electrode to contact an arcing chamber within the cavity. Rotation of the electrode away from the tip generatesa pilot arc in the arcing chamber.

REFERENCES:
patent: 4902871 (1990-02-01), Sanders et al.
patent: 5874707 (1999-02-01), Iida et al.
patent: 5961855 (1999-10-01), Hewett et al.
patent: 6096993 (2000-08-01), Marhic et al.
patent: 6163008 (2000-12-01), Roberts et al.
patent: 6472631 (2002-10-01), Eickhoff et al.

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