US3604883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple electrode assembly for electrical discharge machining
Assignee: Engineered Models Corp
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Filing: 1969-03-26
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Granted: 1971-09-14
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Expires: 1989-03-26
Abstract
Abstract The invention is embodied in an assembly providing multiple, closely spaced electrodes for attachment to a conventional electrical discharge machining apparatus. The relatively slender (small-diameter) rod electrodes are each held in an encircling tube which is rigidly held in two spaced, parallel plates with a material such as an epoxy resin adhering to the plates and sealing the tubes in place.
Inventors
- 👤 Clifford H Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26; B23H7/265
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
In an electrical discharge machining apparatus for piercing a series of closely spaced apertures in an electrically conductive workpiece by causing intermittent electrical discharge across a gap between the workpiece and the electrode, a multiple electrode assembly adapted to be mounted on an electrical discharge machining apparatus in overlying relation to the workpiece, said assembly comprising: two spaced, parallel plates having registering apertures therein, rigid tubes extending through each pair of registering apertures, sealing means securing said tubes in place in said plates, said rigid tubes extending beyond the outeR face of said parallel plates and said sealing means comprising an epoxy resin layer placed on the outer faces of the plates at said plate apertures to a thickness substantially equal to the extension of said tubes beyond the outer faces of said parallel plates, and expendable rod electrodes accommodated in and fed through said tubes, said electrodes being adapted to pierce apertures simultaneously in said workpiece conforming to the pattern of registering apertures in said plates.
Claim 2
Dependent Claim
167 words
In an electrical discharge machining apparatus for piercing a series of closely spaced apertures in an electrically conductive workpiece by causing intermittent electrical discharge across a gap between the workpiece and the electrode, a multiple electrode assembly adapted to be mounted on an electrical discharge machining apparatus in overlying relation to the workpiece, said assembly comprising: two spaced, parallel plates having registering apertures therein, rigid tubes extending through each pair of registering apertures, sealing means securing said tubes in place in said plates, said rigid tubes extending beyond the outeR face of said parallel plates and said sealing means comprising an epoxy resin layer placed on the outer faces of the plates at said plate apertures to a thickness substantially equal to the extension of said tubes beyond the outer faces of said parallel plates, and expendable rod electrodes accommodated in and fed through said tubes, said electrodes being adapted to pierce apertures simultaneously in said workpiece conforming to the pattern of registering apertures in said plates.
Claim 3
Dependent Claim
48 words
A multiple electrode assembly for electrical discharge machining as claimed in claim 1 in which said plates extend beyond the plate area occupied by said registering apertures, the spaced extending portions of said plates being adapted to accommodate therebetween and to be rigidly fastened to a supporting fixture.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |