US3622734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nontrepanning rotary electrode for electroerosion of metals
Assignee: UNIFORM TUBES Inc
•
Filing: 1970-04-20
•
Granted: 1971-11-23
•
Expires: 1990-04-20
Abstract
Abstract A rotary electrode for electroerosion of metals to form blind or deep through holes in which the dielectric fluid bore or conduit, at least at the operative end of the electrode, is of crescent shape in cross section having cusps extending beyond the central axis of the electrode to prevent the formation of a central plug or core due to trepanning as the electrode is rotated during the electroerosion operation, the bore at its widest cross-sectional area extending up to the central axis of the electrode as a maximum.
Inventors
- 👤 Albert Bruce Mainwaring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:43
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A rotary electrode for forming holes in metal workpieces by electroerosion, the improvement in the electrode comprising an elongated metallic member having a through bore for the passage of a dielectric fluid, said bore at the active end of the member being crescent-shaped in cross section and having cusps extending beyond the central axis of the member, said crescent-shaped bore including a longer outer circumferentially extending curved surface and a shorter inner reversely curved circumferentially extending surface having a node, the radial distance from the outer surface of the member centrally through the bore to the node being equal to or less than one-half the diameter of the circle generated by the outer surface of the member during its rotation.
Claim 2
Dependent Claim
120 words
A rotary electrode for forming holes in metal workpieces by electroerosion, the improvement in the electrode comprising an elongated metallic member having a through bore for the passage of a dielectric fluid, said bore at the active end of the member being crescent-shaped in cross section and having cusps extending beyond the central axis of the member, said crescent-shaped bore including a longer outer circumferentially extending curved surface and a shorter inner reversely curved circumferentially extending surface having a node, the radial distance from the outer surface of the member centrally through the bore to the node being equal to or less than one-half the diameter of the circle generated by the outer surface of the member during its rotation.
Claim 3
Dependent Claim
31 words
The electrode of claim 1 wherein the member is cylindrical and the node of the Reversely curved surface of the crescent-shaped bore is coincident with the central axis of the member.
Claim 4
Dependent Claim
21 words
The electrode of claim 1 wherein the crescent-shaped bore extends for the length of the member from the active end thereof.
Claim 5
Dependent Claim
127 words
A rotary electrode for forming holes in metal workpieces by electroerosion, the improvement in said electrode comprising an elongated cylindrical metallic member having a through bore for the passage of a dielectric fluid, said bore at the active end of the member being crescent-shaped in cross section, said crescent-shaped bore being formed of a longer outer circumferentially extending curved surface and a shorter inner reversely curved, circumferentially extending surface having a node, the radial distance from the outer surface of the member centrally through the bore to the node being equal to or less than one-half the outer diameter of the member, the wall of the member being radially indented along the length of the crescent-shaped bore to thereby form the shorter inner reversely curved surface thereof.
Claim 6
Dependent Claim
127 words
A rotary electrode for forming holes in metal workpieces by electroerosion, the improvement in said electrode comprising an elongated cylindrical metallic member having a through bore for the passage of a dielectric fluid, said bore at the active end of the member being crescent-shaped in cross section, said crescent-shaped bore being formed of a longer outer circumferentially extending curved surface and a shorter inner reversely curved, circumferentially extending surface having a node, the radial distance from the outer surface of the member centrally through the bore to the node being equal to or less than one-half the outer diameter of the member, the wall of the member being radially indented along the length of the crescent-shaped bore to thereby form the shorter inner reversely curved surface thereof.
Claim 7
Dependent Claim
16 words
The electrode of claim 4 wherein the crescent-shaped bore extends for the length of the member.
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 |