Patent US4089785A successfully refreshed from Google Patents.
US3921055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding power supply having dual output transformer
Assignee: ESAB AB
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Filing: 1973-12-20
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Granted: 1975-11-18
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Expires: 1993-12-20
Abstract
Abstract A welding power supply incorporating a transforming device comprising a three legged ferromagnetic core structure wherein the third leg of the structure is separated from the other legs by at least one nonmagnetic gap and wherein the primary winding is wound about the first leg and the secondary winding wound partially about the first leg and partially about the third leg.
Inventors
- 👤 William Franklin Dorsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:56
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/08; B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
An electric welding power supply comprising: a three legged ferromagnetic structure having a fixed core with each leg being substantially equal in cross-sectional area and length and with the second one of the legs located intermediate the first and third of said three legs respectively; at least one means of insulating material located between said second and third leg for limiting the passage of flux through said third leg; a primary winding wound on said first leg and adapted to be connected to a source of alternating current; a secondary winding having two series connected sections, the first of said sections being wound on said first leg in close coupling to said primary winding and the second of said sections being wound on the third leg of said structure; a first plurality of output taps located on said first section of said secondary winding for providing a plurality of constant potential outputs; a second plurality of output taps located on said second section of said secondary winding for providing a plurality of constant current outputs; a full wave bridge rectifier; and means for coupling said full wave bridge rectifier to any one of said plurality of output taps on said first and second sections respectively.
Claim 2
Dependent Claim
205 words
An electric welding power supply comprising: a three legged ferromagnetic structure having a fixed core with each leg being substantially equal in cross-sectional area and length and with the second one of the legs located intermediate the first and third of said three legs respectively; at least one means of insulating material located between said second and third leg for limiting the passage of flux through said third leg; a primary winding wound on said first leg and adapted to be connected to a source of alternating current; a secondary winding having two series connected sections, the first of said sections being wound on said first leg in close coupling to said primary winding and the second of said sections being wound on the third leg of said structure; a first plurality of output taps located on said first section of said secondary winding for providing a plurality of constant potential outputs; a second plurality of output taps located on said second section of said secondary winding for providing a plurality of constant current outputs; a full wave bridge rectifier; and means for coupling said full wave bridge rectifier to any one of said plurality of output taps on said first and second sections respectively.
Claim 3
Dependent Claim
25 words
An electric welding power supply as defined in claim 1 wherein said insulating means is a plastic having a width between 1/8 - 5/16 inches.
Claim 4
Dependent Claim
84 words
An electric welding power supply as defined in claim 2 further comprising switch means having a first and a second position wherein when said switch means is in said first position said full wave bridge circuit is coupled to the secondary winding only through thE output taps of said first section thereof and wherein when said switch means is in said second position said full wave bridge circuit is coupled to the secondary winding only through the output taps of said second section thereof.
Claim 5
Dependent Claim
179 words
A single phase dual output welding transformer structure comprising: a fixed ferromagnetic core structure having a first and second outer leg and a third leg located substantially intermediate said first and second legs, each leg being substantially equal in cross-sectional area and length; a primary winding wound on said first leg and adapted to be connected to a source of alternating current; a secondary winding have a first and second section connected in series to one another with said first section being wound on said first leg in close coupling to said primary winding and with said second section being wound on said second leg; at least one means of insulting material located between the second and third leg of said structure for limiting the passage of flux through said second leg; a first plurality of output taps located on said first section of said secondary winding for providing a plurality of constant potential outputs; and a second plurality of output taps located on said second section of said secondary winding for providing a plurality of constant current outputs.
Claim 6
Dependent Claim
179 words
A single phase dual output welding transformer structure comprising: a fixed ferromagnetic core structure having a first and second outer leg and a third leg located substantially intermediate said first and second legs, each leg being substantially equal in cross-sectional area and length; a primary winding wound on said first leg and adapted to be connected to a source of alternating current; a secondary winding have a first and second section connected in series to one another with said first section being wound on said first leg in close coupling to said primary winding and with said second section being wound on said second leg; at least one means of insulting material located between the second and third leg of said structure for limiting the passage of flux through said second leg; a first plurality of output taps located on said first section of said secondary winding for providing a plurality of constant potential outputs; and a second plurality of output taps located on said second section of said secondary winding for providing a plurality of constant current outputs.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |