US3566072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc welding supply
Assignee: Chemetron Corp
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Filing: 1968-12-23
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Granted: 1971-02-23
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Expires: 1988-12-23
Abstract
Abstract This disclosure includes a dual polarity, multiple operator direct-current welding source including a single phase or a three-phase constant potential transformer having a primary winding and a pair of secondary windings. A separate full wave diode bridge rectifier is connected to each of the secondary windings. A double pole, double throw switch unit connects the rectifiers to three weld terminals for single polarity welding or dual polarity welding. The one pole is interconnected to the positive side of the one rectifier and selectively engages a first contact connected to the positive side of the second rectifier and to the positive weld terminals or a second contact connected to the common weld terminal. The second switch pole is connected to the negative side of the second rectifier and a first contact connected to the negative side of the first rectifier and to the negative weld terminal means or a second contact connected to the common weld terminal.
Inventors
- 👤 Dennis G Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:05
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006; B23K9/1043; B23K9/1068
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
244 words
In an arc welding system for supplying direct current power from an alternating current power source to a welding station having a common weld terminal, a positive weld terminal and a negative weld terminal, the improvement comprising a welding power supply including a transformer having a primary winding connected to the power source and a pair of secondary windings, said transformer being a constant potential transformer having said primary winding close-coupled to said secondary windings, a first full wave rectifier connected to one of said secondary windings and having a positive terminal and a negative terminal, and a second full wave rectifier connected to the other of said secondary windings and having a positive terminal and a negative terminal, said rectifiers establishing a pair of direct current outputs; and a selector switch having a first position for connecting the positive output terminal of said first rectifier and the negative polarity output terminal of said second rectifier to the common weld terminal, the negative terminal of said first rectifier to the negative weld terminal and the positive terminal of said second rectifier to the second weld terminal, whereby a reverse polarity arc can be established at the positive weld terminal and a straight polarity arc can be established at the negative weld terminal simultaneously, said selector switch having a second position connecting said rectifier in parallel between the positivE weld terminal and the negative weld terminal and disconnecting the common weld terminal from said rectifiers.
Claim 2
Dependent Claim
244 words
In an arc welding system for supplying direct current power from an alternating current power source to a welding station having a common weld terminal, a positive weld terminal and a negative weld terminal, the improvement comprising a welding power supply including a transformer having a primary winding connected to the power source and a pair of secondary windings, said transformer being a constant potential transformer having said primary winding close-coupled to said secondary windings, a first full wave rectifier connected to one of said secondary windings and having a positive terminal and a negative terminal, and a second full wave rectifier connected to the other of said secondary windings and having a positive terminal and a negative terminal, said rectifiers establishing a pair of direct current outputs; and a selector switch having a first position for connecting the positive output terminal of said first rectifier and the negative polarity output terminal of said second rectifier to the common weld terminal, the negative terminal of said first rectifier to the negative weld terminal and the positive terminal of said second rectifier to the second weld terminal, whereby a reverse polarity arc can be established at the positive weld terminal and a straight polarity arc can be established at the negative weld terminal simultaneously, said selector switch having a second position connecting said rectifier in parallel between the positivE weld terminal and the negative weld terminal and disconnecting the common weld terminal from said rectifiers.
Claim 3
Dependent Claim
175 words
In an arc welding system supplying direct current power to a weld station having a common weld terminal, a positive weld terminal and a negative weld terminal, the improvement comprising an arc welding power supply comprising a transformer having a primary winding and a pair of secondary windings, first and second full wave rectifiers each having a positive output terminal and a negative output terminal and each being connected to one of said secondary windings to establish a pair of direct current outputs, and a selector switch having a first position for connecting the negative output terminal of said first rectifier and the positive output terminal of said second rectifier to the common weld terminal and for connecting the positive output terminal of said first rectifier to the positive weld terminal and the negative output terminal of said second rectifier to the negative weld terminal, said switch having a second position connecting said rectifiers in parallel between the positive weld terminal and the negative weld terminal and disconnecting the common weld terminal from said rectifiers.
Claim 4
Dependent Claim
175 words
In an arc welding system supplying direct current power to a weld station having a common weld terminal, a positive weld terminal and a negative weld terminal, the improvement comprising an arc welding power supply comprising a transformer having a primary winding and a pair of secondary windings, first and second full wave rectifiers each having a positive output terminal and a negative output terminal and each being connected to one of said secondary windings to establish a pair of direct current outputs, and a selector switch having a first position for connecting the negative output terminal of said first rectifier and the positive output terminal of said second rectifier to the common weld terminal and for connecting the positive output terminal of said first rectifier to the positive weld terminal and the negative output terminal of said second rectifier to the negative weld terminal, said switch having a second position connecting said rectifiers in parallel between the positive weld terminal and the negative weld terminal and disconnecting the common weld terminal from said rectifiers.
Claim 5
Dependent Claim
26 words
The arc welding power supply of claim 2 wherein said transformer is a constant potential transformer having the primary winding close coupled to said secondary windings.
Claim 6
Dependent Claim
107 words
The welding power supply according to claim 2 wherein said switch comprises a double pole-double throw switch having a first contact arm connected to the positive terminal of said first rectifier and a pair of associated contacts one of which is connected to the common weld terminal and the second of which is connected to the positive terminal of said second rectifier; and a second contact arm connected to the negative terminal of said second rectifier and a pair of associated contacts one of which is connected to the common weld terminal and the second of which is connected to the negative terminal of said first rectifier.
Claim 7
Dependent Claim
25 words
The arc welding power supply of claim 2 wherein said transformer is a three-phase constant potential transformer, said rectifiers being three-phase full wave diode rectifiers.
Claim 8
Dependent Claim
122 words
The arc welding power supply of claim 5 wherein said switch comprises a double pole double throw switch having a first contact arm connected to the positive terminal of said first rectifier and a pair of associated contacts one of which is connected to the common weld terminal and the second of which is connected to the positive terminal of said second rectifier and to the positive weld terminal, said switch having a second contact arm connected to the negative terminal of said second rectifier and a pair of associated contacts one of which is connected to the common weld terminal and the second of which is connected to the negative terminal of said first rectifier and to the negative weld terminal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |