Patent US1653381A successfully refreshed from Google Patents.
Patent US3629540A successfully refreshed from Google Patents.
US3629540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark erosion head with means for rotating and gyrating the electrode
Assignee: Altfeld & Co GmbH
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Filing: 1970-06-29
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Granted: 1971-12-21
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Expires: 1990-06-29
Abstract
Abstract The electrode-carrying head of an electrodischarge machining (EDM) apparatus includes a planetary-gear arrangement for rotating the electrode about its own axis as the electrode axis is, in turn, displaced relatively to the workpiece. This system enables the use of an electrode for various machining modes and eliminates the need for tool electrodes precisely complementary to the configuration to be produced.
Inventors
- 👤 Hans Altfeld
- 👤 Ewald Sauter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:00
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26; B23H7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
A head for a spark-erosion machine, comprising: a support; a housing journaled for rotation relative to said support about a first axis; an electrode holder mounted on said housing for rotation relatively thereto about a second axis generally parallel to said first axis; a transmission interconnecting said electrode holder and said housing for rotating said electrode holder about said second axis upon rotation of said housing about said first axis; a bearing body received in said housing and rotatably carrying said electrode holder; spring-loaded point-contact support members bearing upon said body at three spaced-apart locations in said housing for positioning same therein; and a conical centering pivot mounting said body for swinging movement about a third axis offset from said first and second axes, but generally parallel thereto.
Claim 2
Dependent Claim
128 words
A head for a spark-erosion machine, comprising: a support; a housing journaled for rotation relative to said support about a first axis; an electrode holder mounted on said housing for rotation relatively thereto about a second axis generally parallel to said first axis; a transmission interconnecting said electrode holder and said housing for rotating said electrode holder about said second axis upon rotation of said housing about said first axis; a bearing body received in said housing and rotatably carrying said electrode holder; spring-loaded point-contact support members bearing upon said body at three spaced-apart locations in said housing for positioning same therein; and a conical centering pivot mounting said body for swinging movement about a third axis offset from said first and second axes, but generally parallel thereto.
Claim 3
Dependent Claim
23 words
The head defined in claim 1, further comprising adjusting means in said housing for shifting said electrode holder relative to said first axis.
Claim 4
Dependent Claim
23 words
The head defined in claim 2 wherein said adjusting means includes a threaded-screw arrangement acting upon said holder transversely to said second axis.
Claim 5
Dependent Claim
20 words
The head defined in claim 2 wherein said adjusting means includes a template controlling the position of said electrode holder.
Claim 6
Dependent Claim
35 words
The head defined in claim 1, further comprising retaining means forming part of said machine and bearing with point contact upon said support, said support comprising a flange extending generally transversely to said first axis.
Claim 7
Dependent Claim
25 words
The head defined in claim 5, further comprising a shaft passing rotatably through said flange, said housing being affixed to said shaft for rotation thereby.
Claim 8
Dependent Claim
15 words
The head defined in claim 6 wherein said transmission means includes a planetary gear transmission.
Claim 9
Dependent Claim
57 words
The head defined in claim 8 wherein said planetary gear transmission comprises a driven gear carried by said electrode holder, and rotatable about said second axis, the sun gear centered on said first axis and fixed relative to said flange, and planetary gear means entrained with said housing and coupling said sun gear with said driven gear.
Claim 10
Dependent Claim
95 words
The head defined in claim 8 wherein said planetary gear means includes a planetary shaft extending generally parallel to said axes and journaled in said housing, a first planet gear meshing with said sun gear and fixed to said planet shaft, a second planet gear fixed to said planet shaft, a yoke swingably mounted on said planet shaft, an idler gear journaled on said yoke and meshing jointly with said second planet gear and said driven gear, and spring means bearing upon said yoke and urging said idler gear into mesh with said driven gear.
References Cited (Backward Citations)
US2974216A
Cited
US3430026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |