US Patent No. 9,883,575

PLASMA CUTTING TORCH, NOZZLE AND SHIELD CAP


Patent No. 9,883,575
Issue Date January 30, 2018
Title Plasma Cutting Torch, Nozzle And Shield Cap
Inventorship Praveen K. Namburu, Charleston, SC (US)
Assignee LINCOLN GLOBAL, INC., Santa Fe Springs, CA (US)

Claim of US Patent No. 9,883,575

1. A plasma cutting torch assembly, comprising:
an outer retaining cap having a central portion which has a first maximum outer diameter which is the largest outer diameter
of the outer retaining cap, and a downstream cylindrical portion which is coupled to the central portion and has a second
maximum outer diameter which is smaller than the first maximum diameter, where the downstream cylindrical portion is positioned
closer to a distal end of the plasma cutting torch assembly than the central portion; and

a shield cap which is secured to the plasma cutting torch assembly by the outer retaining cap, and having a distal end face
with a flat circular surface having a diameter D, and an angular outer surface which extends from the distal end face to a
distal end of the outer retaining cap, and where the shield cap has an exposed outer surface height SH such that a ratio of
the diameter D to the height SH is in a range of 0.25 to 0.35, where the height SH is measured vertically from the distal
end face to the distal end of the outer retaining cap,

wherein the angular outer surface has a conical shape and where the angular outer surface has an angle in a range of 50 to
65 degrees relative to a horizontal line passing through the distal end face of the shield cap.