US 10,561,010 B2
Internally energized electrode of a plasma arc torch
Micah Roberts, Lebanon, NH (US); Christopher Pillsbury, Lebanon, NH (US); and Steve Dunbar, Lebanon, NH (US)
Assigned to Hypertherm, Inc., Hanover, NH (US)
Filed by Hypertherm, Inc., Hanover, NH (US)
Filed on Dec. 21, 2016, as Appl. No. 15/386,297.
Application 15/386,297 is a continuation in part of application No. 15/228,708, filed on Aug. 4, 2016, granted, now 10,278,274.
Application 15/228,708 is a continuation in part of application No. 15/228,750, filed on Aug. 4, 2016.
Application 15/228,750 is a continuation in part of application No. 15/228,758, filed on Aug. 4, 2016.
Application 15/228,758 is a continuation in part of application No. 15/228,813, filed on Aug. 4, 2016.
Claims priority of provisional application 62/270,178, filed on Dec. 21, 2015.
Prior Publication US 2017/0181261 A1, Jun. 22, 2017
Int. Cl. B23K 10/00 (2006.01); H05H 1/28 (2006.01)
CPC H05H 1/28 (2013.01) 25 Claims
OG exemplary drawing
 
1. A coolant tube for a plasma arc torch, the coolant tube comprising:
an elongated coolant tube body, made from an electrically conductive material, including a first end configured to engage an electrode and a second end configured to engage a body of the plasma arc torch;
a first electrically conductive element coupled to the first end of the elongated coolant tube body, the first electrically conductive element being resilient and configured to physically contact the electrode; and
a second electrically conductive element coupled to the second end of the elongated coolant tube body, the second electrically conductive element being resilient and configured to physically contact the body of the plasma arc torch;
wherein the elongated coolant tube body defines a current path and a fluid path between the body of the plasma arc torch and the electrode,
and wherein substantially all of a current from the body of the plasma arc torch is passed to the electrode via the conductive coolant tube through (i) a first physical interface formed between the body of the plasma arc torch and the second electrically conductive element that is coupled to the coolant tube and (ii) a second physical interface between the electrode and the first electrically conductive element that is coupled to the coolant tube, without passing the current directly from the body of the plasma arc torch to the electrode.