Patent US3623148A successfully refreshed from Google Patents.
US3623148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sensing the frequency of machining pulses from an edm power supply
Assignee: Milacron Inc
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Filing: 1970-07-13
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Granted: 1971-11-23
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Expires: 1990-07-13
Abstract
Abstract An apparatus for monitoring the frequency of output pulses from an EDM power supply and terminating the operation of the supply when the output pulse frequency exceeds a predetermined magnitude. The apparatus comprises a frequency sensing circuit that produces an output signal having a magnitude that is a function of the output pulse frequency. A switching network is connected to the sensing circuit and terminates the operation of the power supply in response to an output signal representing the predetermined output pulse frequency magnitude.
Inventors
- 👤 Philip E Berghausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:14
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/026
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
In an EDM power supply of the type comprising an oscillator producing pulses having a constant voltage magnitude and a variable frequency, and power switching circuits responsive and sensitive to the frequency of said oscillator pulses for switching an output of a DC source to produce machining pulses from the power supply, an improvement comprising the steps of: a. sensing the frequency of the oscillator output signal by a frequency sensitive circuit and producing an output signal having a magnitude that is a function of the frequency of the oscillator pulses; and b. inhibiting by a disabling network the production of pulses from the oscillator in response to a predetermined magnitude of the output signal representing a pulse frequency that may be damaging to the power switching circuits.
Claim 2
Dependent Claim
128 words
In an EDM power supply of the type comprising an oscillator producing pulses having a constant voltage magnitude and a variable frequency, and power switching circuits responsive and sensitive to the frequency of said oscillator pulses for switching an output of a DC source to produce machining pulses from the power supply, an improvement comprising the steps of: a. sensing the frequency of the oscillator output signal by a frequency sensitive circuit and producing an output signal having a magnitude that is a function of the frequency of the oscillator pulses; and b. inhibiting by a disabling network the production of pulses from the oscillator in response to a predetermined magnitude of the output signal representing a pulse frequency that may be damaging to the power switching circuits.
Claim 3
Dependent Claim
153 words
In an EDM power supply of the type comprising an oscillator producing pulses having a constant voltage magnitude and a variable frequency, and power switching circuits responsive and sensitive to the frequency of said oscillator pulses for switching an output of a DC source to produce machining pulses from the power supply, an improvement comprising: a. sensing the frequency of the oscillator output signal by a frequency sensitive circuit and producing an output signal having a magnitude that is a function of the frequency of the oscillator pulses; b. producing by a switching circuit, a second output signal in response to a predetermined magnitude of the first output signal from the sensing circuit representing a pulse frequency that may be damaging to the power switching circuits; and c. terminating by a disabling network the input of pulses prodUced by the oscillator to the power switching circuits in response to the second output signal.
Claim 4
Dependent Claim
153 words
In an EDM power supply of the type comprising an oscillator producing pulses having a constant voltage magnitude and a variable frequency, and power switching circuits responsive and sensitive to the frequency of said oscillator pulses for switching an output of a DC source to produce machining pulses from the power supply, an improvement comprising: a. sensing the frequency of the oscillator output signal by a frequency sensitive circuit and producing an output signal having a magnitude that is a function of the frequency of the oscillator pulses; b. producing by a switching circuit, a second output signal in response to a predetermined magnitude of the first output signal from the sensing circuit representing a pulse frequency that may be damaging to the power switching circuits; and c. terminating by a disabling network the input of pulses prodUced by the oscillator to the power switching circuits in response to the second output signal.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |