Patent US3909694A successfully refreshed from Google Patents.
US3909694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for a condenser discharge type welder
Assignee: Toshiba Corp
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Filing: 1974-03-13
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Granted: 1975-09-30
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Expires: 1994-03-13
Abstract
Abstract A control circuit for a condenser discharge type welder comprises a switching element connected in a discharge path of the condenser and driving means for turning on the switching element thereby allowing a discharge for welding. The driving means and the discharge path have a commonly used portion which prohibits discharge when the discharge path is not adequately made.
Inventors
- 👤 Hiroshi Yokota
- 👤 Humimasa Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:47
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A control circuit for a condenser discharge type welder comprising: a large capacity condenser having a charging path and a discharge path; means for charging said condenser; a first switching element connected in said discharge path of said condenser; a second switching element connected in said charging path of said condenser; a discharge start switch; means for controlling said second switching element to terminate charging along with operation of said discharge start switch; and a driving circuit for turning on said first switching element to start discharging after charging is terminated; and said driving circuit having a common electric path with said discharge path to prevent discharge even when said discharge start switch is closed whenever the welder is not in contact with the material to be welded.
Claim 2
Dependent Claim
128 words
A control circuit for a condenser discharge type welder comprising: a large capacity condenser having a charging path and a discharge path; means for charging said condenser; a first switching element connected in said discharge path of said condenser; a second switching element connected in said charging path of said condenser; a discharge start switch; means for controlling said second switching element to terminate charging along with operation of said discharge start switch; and a driving circuit for turning on said first switching element to start discharging after charging is terminated; and said driving circuit having a common electric path with said discharge path to prevent discharge even when said discharge start switch is closed whenever the welder is not in contact with the material to be welded.
Claim 3
Dependent Claim
115 words
A control circuit for a condenser discharge type welder comprising: a large capacity condenser having a discharge path; means for charging said condenser; means for checking the charged condition of said condenser; a switching element connected in said discharge path of said condenser; a discharge start switch; a driving circuit for turning on said switching element along with operation of said discharge start switch; said driving circuit having a common electric path with said discharge path to prevent discharge even when said discharge start switch is closed whenever the welder is not in contact with the material to be welded; and means for restraining operation of said switching element during the charging of said condenser.
Claim 4
Dependent Claim
115 words
A control circuit for a condenser discharge type welder comprising: a large capacity condenser having a discharge path; means for charging said condenser; means for checking the charged condition of said condenser; a switching element connected in said discharge path of said condenser; a discharge start switch; a driving circuit for turning on said switching element along with operation of said discharge start switch; said driving circuit having a common electric path with said discharge path to prevent discharge even when said discharge start switch is closed whenever the welder is not in contact with the material to be welded; and means for restraining operation of said switching element during the charging of said condenser.
Claim 5
Dependent Claim
152 words
A control circuit for a condenser discharge type welder comprising: a large capacity condenser having a charging path and a discharge path; means for charging said condenser; means for checking the charged condition of said condenser; a first switching element conneCted in said discharge path of said condenser; a second switching element connected in said charging path of said condenser; a discharge start switch; means for controlling said second switching element to terminate charging along with operation of said discharge start switch; a driving circuit for turning on said first switching element to start discharging after charging is terminated; said driving circuit having a common electric path with said discharge path to prevent discharge even when said discharge start switch is closed whenever the welder is not in contact with the material to be welded; and means for restraining turning on of said first switching element during the charging of said condenser.
Claim 6
Dependent Claim
152 words
A control circuit for a condenser discharge type welder comprising: a large capacity condenser having a charging path and a discharge path; means for charging said condenser; means for checking the charged condition of said condenser; a first switching element conneCted in said discharge path of said condenser; a second switching element connected in said charging path of said condenser; a discharge start switch; means for controlling said second switching element to terminate charging along with operation of said discharge start switch; a driving circuit for turning on said first switching element to start discharging after charging is terminated; said driving circuit having a common electric path with said discharge path to prevent discharge even when said discharge start switch is closed whenever the welder is not in contact with the material to be welded; and means for restraining turning on of said first switching element during the charging of said condenser.
References Cited (Backward Citations)
US3171011A
Cited
US3262043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |