Patent US3418208A successfully refreshed from Google Patents.
US3663787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically-assisted combustion cutting apparatus
Assignee: Individual
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Filing: 1969-06-25
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Granted: 1972-05-16
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Expires: 1989-06-25
Abstract
Abstract Cutting apparatus comprises cutting electrode, means for moving the electrode, and means for supporting a workpiece adjacent a cutting surface of the electrode such that the cutting surface can be moved continuously in a direction substantially parallel to the face of the cut to be made in the workpiece. Means provided for translating one of the workpiece and the electrode toward and away from the other. A source of electric potential and a pulse generating circuit are connected to the electrode and workpiece to induce repetitive discharges across a gap between the electrode and workpiece. The apparatus further includes means for interjecting a combustion supporting medium into the gap whereby combustion of workpiece at the cutting face is initiated by the gap discharges.
Inventors
- 👤 Walter T Haswell
- 👤 Terry O Hockenberry
- 👤 Everard M Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:31
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/12; B23H1/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
187 words
Cutting apparatus comprising a cutting electrode of a rotatably mounted disc disposed generally parallel to the direction of intended cut in a workpiece, meanS for moving said electrode, means for supporting the workpiece adjacent a cutting surface of said electrode such that said cutting surface can be moved continuously in a direction substantially parallel to the face of the cut to be made in said workpiece, means for translating one of said workpieces and said electrode toward and away from the other, a source of electric potential and a pulse generating circuit connected to said electrode and said workpiece to induce repetitive spark machining type discharges across a gap between said electrode and said workpiece, and means for interjecting a combustion-supporting medium into said gap for combustion of said workpiece at said cutting face, said means for interjecting including a plurality of radial passages extending through said electrode and opening into the cutting edge thereof, distributing valve means coupled to the passages for injecting portions of said medium into said radial passages to the extent that a given one of said passages is juxtaposed to said workpiece.
Claim 2
Dependent Claim
187 words
Cutting apparatus comprising a cutting electrode of a rotatably mounted disc disposed generally parallel to the direction of intended cut in a workpiece, meanS for moving said electrode, means for supporting the workpiece adjacent a cutting surface of said electrode such that said cutting surface can be moved continuously in a direction substantially parallel to the face of the cut to be made in said workpiece, means for translating one of said workpieces and said electrode toward and away from the other, a source of electric potential and a pulse generating circuit connected to said electrode and said workpiece to induce repetitive spark machining type discharges across a gap between said electrode and said workpiece, and means for interjecting a combustion-supporting medium into said gap for combustion of said workpiece at said cutting face, said means for interjecting including a plurality of radial passages extending through said electrode and opening into the cutting edge thereof, distributing valve means coupled to the passages for injecting portions of said medium into said radial passages to the extent that a given one of said passages is juxtaposed to said workpiece.
Claim 3
Dependent Claim
89 words
The combination according to claim 1 wherein said electrode disc is mounted on a drive shaft for rotation therewith, said distributing valve includes apertured valve means juxtaposed to said electrode disc, and a stationary hub member is juxtaposed to said valve member and shaped to rotatably receive and support an end of said drive shaft, said hub having an inlet port coupled to a source of said combustion medium, and valve means having a number of apertures positioned for successive engagement with said port as said shaft is rotated.
Claim 4
Dependent Claim
44 words
The combination according to claim 1 wherein said electrode disc, said drive shaft and rotating means for said shaft are mounted upon movable support, and said translating means are coupled to said support for translating said electrode disc toward and away from said workpiece.
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |