US3769483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply circuit and method of electrical discharge machining
Assignee: Colt Industries Inc
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Filing: 1972-05-25
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Granted: 1973-10-30
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Expires: 1992-05-25
Abstract
Abstract A number of output electronic switches are included in the circuit, all having their principal or power conducting electrodes connected in parallel between a common terminal of a main machining power supply and the gap. A system is included for sequentially triggering the output switches into conduction and then repeating the process to provide a continuous train of machining power pulses to the gap. The system includes a set of ''''on'''' time control flip-flops arranged in shift register configuration and a corresponding set of ''''off'''' time control flip-flops likewise arranged in shift register configuration. The outputs from the ''''on'''' time control flip-flops are each connected to a different intermediate drive stage for providing the sequential time-spaced operation of each of the output switches.
Inventors
- 👤 O Bell
- 👤 T Prophet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:43
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/12; B; B23; B23H; B23H1/00; B23H1/02; B23H1/022; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6257
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
In an electrical discharge machining power supply for removing material from an electrically conductive workpiece by a tool electrode spaced therefrom by a dielectric coolant filled gap, a power supply, a plurality of electronic output switches, each of said switches having its principal electrodes connected between a common terminal of said power supply and the gap, means for sequentially triggering the control electrodes of said output switches to render them conductive at regular time-spaced intervals to provide trains of machining power pulses across said gap, a means for regulating the uniform spacing of the output pulses from said triggering means to control conduction of said switches, said triggering means including a source of uniform ontime pulses, each of said on-time pulses separated from the other by a like time interval and said regulating means comprising an array of flip-flops connected in a shift register configuration for successively providing the triggering pulses to said plurality of electronic output switches.
Claim 2
Dependent Claim
158 words
In an electrical discharge machining power supply for removing material from an electrically conductive workpiece by a tool electrode spaced therefrom by a dielectric coolant filled gap, a power supply, a plurality of electronic output switches, each of said switches having its principal electrodes connected between a common terminal of said power supply and the gap, means for sequentially triggering the control electrodes of said output switches to render them conductive at regular time-spaced intervals to provide trains of machining power pulses across said gap, a means for regulating the uniform spacing of the output pulses from said triggering means to control conduction of said switches, said triggering means including a source of uniform ontime pulses, each of said on-time pulses separated from the other by a like time interval and said regulating means comprising an array of flip-flops connected in a shift register configuration for successively providing the triggering pulses to said plurality of electronic output switches.
Claim 3
Dependent Claim
176 words
In an electrical machining power supply for removing material from an electrically conductive workpiece by a tool electrode spaced therefrom by a dielectric coolant filled gap, a power supply, a plurality of electronic output switches, each of said switches having its principal electrodes connected between a common terminal of said power supply and the gap, means for sequentially triggering the control electrodes of said output switches to render them conductive for like time durations at regular timed spaced intervals thus to provide trains of machining power pulses across the gap, a like plurality of drive stages, each connected between said triggering means and a different one of said output switches for controlling its conduction, said triggering means comprising a pulse generator operable to provide separate control pulses for the operation of said drive stages, said pulse generator operable to provide separate ''''off'''' control pulses and separate ''''on'''' control pulses, and wherein a like plurality of dual flip-flops are coupled each to a different one of said drive stages which are sequentially operated for controlling their operation.
Claim 4
Dependent Claim
176 words
In an electrical machining power supply for removing material from an electrically conductive workpiece by a tool electrode spaced therefrom by a dielectric coolant filled gap, a power supply, a plurality of electronic output switches, each of said switches having its principal electrodes connected between a common terminal of said power supply and the gap, means for sequentially triggering the control electrodes of said output switches to render them conductive for like time durations at regular timed spaced intervals thus to provide trains of machining power pulses across the gap, a like plurality of drive stages, each connected between said triggering means and a different one of said output switches for controlling its conduction, said triggering means comprising a pulse generator operable to provide separate control pulses for the operation of said drive stages, said pulse generator operable to provide separate ''''off'''' control pulses and separate ''''on'''' control pulses, and wherein a like plurality of dual flip-flops are coupled each to a different one of said drive stages which are sequentially operated for controlling their operation.
Claim 5
Dependent Claim
41 words
The combination as set forth in claim 2 wherein said pulse generator comprises a source of clock pulses and a pair of one-shot multivibrators for generating spaced ''''off'''' control and ''''on'''' control pulses to control the operation of said drive stages.
Claim 6
Dependent Claim
31 words
The combination as set forth in claim 3 wherein a shift register is coupled between the gated output from said one-shot multivibrators for successively transferring triggering pulses to said drive stages.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |