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US3838820A Expired / Lapsed US ⏱️ 0.0 years remaining

Welding and cutting torch tips

Assignee: Millennium Petrochemicals Inc
•
Filing: 1972-07-28
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Granted: 1974-10-01
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Expires: 1992-07-28
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Abstract

Abstract Welding torch tips and cutting torch tips made from drawn copper tubing instead of conventional copper rod with its expensive drilled-out holes. A torch tip comprising an inner copper tube having a desired inner diameter, an outer copper tube drawn onto the inner tube and drawn to a desired outer diameter to form a combined tube, a nozzle formed on one end of the combined tube, and threads formed on the other end for attachment to a torch. The wall of the inner tube is thinner than the wall of the outside tube. If the torch tip is to be used for cutting, a plurality of radially spaced flutes are formed in the inner surface of the outer tube. If the torch tip is to be used for welding, the inner tube may be made of a lead-brass alloy that is resistant to wear of the welding wire passing therethrough. A method of making a torch tip comprising the steps of taking an inner seamless copper tube, drawing said inner tube to a desired inner and outer diameter, cutting said inner tube into sections and annealing them, drawing said inner sections to desired inner and outer diameter, taking an outer tube, drawing said outer tube to a desired outer and inner diameter, cutting said outer tube into sections and annealing them, inserting an inner tube section into an outer tube section, drawing the tube sections together into a combined tube section, trimming and straightening the combined tube sections, cutting the combined sections to tiplength units, swaging one end of each tip unit into a cone shape to form a nozzle, and threading the other end of each tip unit to adapt it for attachment to a torch. If the torch tip is to be used for cutting, the method includes the step of forming a plurality of inner flutes on the inner surface of the outer tube during the drawing operation before insertion therein of the inner tube.

Inventors

  • 👤 H Pearce

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 00:04
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/154; B21C3/00; B21C3/02; B21C3/04; B21C37/16; F; F23; F23D; F23D14/00; F23D14/46; F23D14/48; F23D14/52; F23D14/54; Y; Y10; Y10S; Y10S266/00; Y10S266/904

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 149 words
A composite drawn-tube cutting torch tip having a smooth-bore central oxygen passageway and a series of smooth-surfaced drawn annular gas passageways comprising an inner drawn metallic tube having desired outer and inner diameters with an outer contact surface adapted to contact the inner contact surface of an outer metallic tube, an outer drawn metallic tube having desired outer and inner diameters with an inner contact surface adapted to contact the outer contact surface of said inner metallic tube, said inner tube extending the length of the outer tube, and flutes drawn into and extending the length of one of said contact surfaces, the inner and outer tubes having been drawn together to form a combined tube section having desired outer and inner diameters and a smooth-bore central oxygen passageway, said flutes and the surface contacted thereby forming radially spaced smooth-surfaced drawn annular gas passageways surrounding said central oxygen passageway.
Claim 2
Dependent Claim 149 words
A composite drawn-tube cutting torch tip having a smooth-bore central oxygen passageway and a series of smooth-surfaced drawn annular gas passageways comprising an inner drawn metallic tube having desired outer and inner diameters with an outer contact surface adapted to contact the inner contact surface of an outer metallic tube, an outer drawn metallic tube having desired outer and inner diameters with an inner contact surface adapted to contact the outer contact surface of said inner metallic tube, said inner tube extending the length of the outer tube, and flutes drawn into and extending the length of one of said contact surfaces, the inner and outer tubes having been drawn together to form a combined tube section having desired outer and inner diameters and a smooth-bore central oxygen passageway, said flutes and the surface contacted thereby forming radially spaced smooth-surfaced drawn annular gas passageways surrounding said central oxygen passageway.
Claim 3
Dependent Claim 40 words
The cutting torch tip of claim 1, said radially spaced smooth-surfaced drawn annular gas passageways being located on the inner surface of said outer tube and said flutes having been drawn in the inner contact surface of said outer tube.
Claim 4
Dependent Claim 37 words
The cutting torch tip of claim 1, including a cone-shaped nozzle at one end of the combined tube section, and threads cut into the other end of the combined tube section for attaching to a cutting torch.
Claim 5
Dependent Claim 150 words
A composite welding torch tip section having a smooth bore of very close tolerance which defines a central passageway for contacting the welding wire substantially all along the central passageway, said torch tip comprising an outer drawn copper tube having desired outer and inner diameters and wall thickness, an inner drawn tube of wear-resistant copper alloy having a substantially thinner wall thickness than said drawn outer tube and having outer and inner diameters, the drawn outer tube having been assembled over the drawn inner tube, the assembled inner and outer tubes having been drawn together simultaneously through a die sized to produce a permanent reduction in the outer diameter of the outer tube and in the inner diameter of the inner tube to form the composite welding torch tip section having a very close tolerance smooth bore with a desired inner diameter for providing good contact with the welding wire.
Claim 6
Dependent Claim 150 words
A composite welding torch tip section having a smooth bore of very close tolerance which defines a central passageway for contacting the welding wire substantially all along the central passageway, said torch tip comprising an outer drawn copper tube having desired outer and inner diameters and wall thickness, an inner drawn tube of wear-resistant copper alloy having a substantially thinner wall thickness than said drawn outer tube and having outer and inner diameters, the drawn outer tube having been assembled over the drawn inner tube, the assembled inner and outer tubes having been drawn together simultaneously through a die sized to produce a permanent reduction in the outer diameter of the outer tube and in the inner diameter of the inner tube to form the composite welding torch tip section having a very close tolerance smooth bore with a desired inner diameter for providing good contact with the welding wire.
Claim 7
Dependent Claim 46 words
The composite welding torch tip of claim 4, including a cone-shaped nozzle formed at one end of said composite welding torch tip section, and threads formed at the other end of said composite welding torch tip section to adapt it for attachment to a welding torch.

References Cited (Backward Citations)

US1133711A Cited
US1568331A Cited
US2217194A Cited
US2694851A Cited
US3149513A Cited
US3104432A Cited
US3200479A Cited
US3686732A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-09-30 1978-04-01 1978-10-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-09-30 1982-04-01 1982-10-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-09-30 1986-04-01 1986-10-01 $7700.00 Window Closed / Lapsed

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