Patent US2251443A successfully refreshed from Google Patents.
US3809852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge machine with mechanism for orbiting the electrode on a polygonal path
Assignee: Individual
•
Filing: 1972-11-16
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Granted: 1974-05-07
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Expires: 1992-11-16
Abstract
Abstract Electrical discharge machine electrode holder, drive and control mechanism for orbiting the electrode on a regular polygonal path with straight sides and angular corners transverse to its path of advance with respect to a workpiece. The control apparatus gradually reduces the size of the orbit path in the course of electrode advance. This eliminates the need for more than one electrode as the workpiece cavity deepens. All rough and finished cuts may be made with the same electrode. The electrode is mounted on a shuttle block with drive means for intermittently driving the block and electrode with rectilinear motion along the straight sides of the polygonal path and with intervening dwell in the corners of the polygonal path.
Inventors
- 👤 J Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:53
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26; B23H7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
176 words
In an electric discharge machine having an electrode holder and means for advancing an electrode mounted in said holder toward a workpiece to produce a cavity therein, the improvement for eliminating the need for repeated replacement of the electrode as the cavity is deepened, for forming angular corners in said cavity, and for eroding corresponding amounts of material from all portions of the bottom of the workpiece cavity regardless of the shape thereof, said improvement comprising means for orbiting the electrode holder on a regular polygonal path having straight sides of equal length and angular corners in a plane transverse to its advance and reducing the size of the orbit in the course of said advance, said means comprising drive means for driving said electrode holder intermittently with rectilinear motion along the straight sides of said polygonal path during which virtually none of the electric discharge machine action of the electrode occurs and intervening dwell in the corners of said polygonal path during which virtually all of the electric discharge machine action of the electrode occurs.
Claim 2
Dependent Claim
176 words
In an electric discharge machine having an electrode holder and means for advancing an electrode mounted in said holder toward a workpiece to produce a cavity therein, the improvement for eliminating the need for repeated replacement of the electrode as the cavity is deepened, for forming angular corners in said cavity, and for eroding corresponding amounts of material from all portions of the bottom of the workpiece cavity regardless of the shape thereof, said improvement comprising means for orbiting the electrode holder on a regular polygonal path having straight sides of equal length and angular corners in a plane transverse to its advance and reducing the size of the orbit in the course of said advance, said means comprising drive means for driving said electrode holder intermittently with rectilinear motion along the straight sides of said polygonal path during which virtually none of the electric discharge machine action of the electrode occurs and intervening dwell in the corners of said polygonal path during which virtually all of the electric discharge machine action of the electrode occurs.
Claim 3
Dependent Claim
41 words
The improvement of claim 1 in which the means for reducing the size of the orbit comprises a vertically elongated tapered guide rod, said electrode holder having a guide follower with a regular polygonal hole through which the rod is received.
Claim 4
Dependent Claim
52 words
The improvement of claim 2 in which the electrode holder comprises a shuttle block mounted for universal movement, said drive means comprising means for driving the block successively in all directions in said transverse plane, whereby thE block will move in the polygonal orbit established by the polygonal configuration of said hole.
Claim 5
Dependent Claim
45 words
The improvement of claim 3 in which the means for driving the block comprises a rotor having a drive arm, said electrode holder having a post engaged by the arm and by which the electrode holder tends to be moved universally as the rotor turns.
Claim 6
Dependent Claim
22 words
The improvement of claim 4 in which the post has a roller, said arm having a groove into which the roller fits.
Claim 7
Dependent Claim
28 words
The improvement of claim 4 in combination with means yieldably mounting the arm on the rotor, whereby to accommodate for variations in the size and shape of orbit.
Claim 8
Dependent Claim
12 words
The improvement of claim 1 in which said polygonal path is square.
Claim 9
Dependent Claim
26 words
The improvement of claim 1 in which said drive means comprises a motor for releasing force to the electrode holder for its said intermittent rectilinear motion.
Claim 10
Dependent Claim
56 words
The improvement of claim 8 in which said motor comprises a rotor, a resiliently loaded drive arm on the rotor and a post on the electrode holder, the rotation of the rotor causing the resiliently loaded drive arm to release energy to the electrode holder during its rectilinear motion and to store energy during its dwell.
References Cited (Backward Citations)
US3135852A
Cited
US3539754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |