US4766280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire electrode for the spark erosive cutting
Assignee: Berkenhoff and Co KG
•
Filing: 1987-02-12
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Granted: 1988-08-23
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Expires: 2007-02-12
Abstract
Abstract To increase the cutting performance of a wire electrode for electroerosive cutting, the surface of the wire electrode is provided with projections and recesses created by twisting the wire electrode of polygonal cross section about its axis.
Inventors
- 👤 Heinrich Groos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:39
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
In a method for the manufacture of wire electrodes for the electroerosive cutting of electrially conducting workpieces, which have a surface with projections and recesses, the improvement comprising wherein the wire electrode is manufactured of a flexible single solid wire having a polygonal cross section by twisting the wire about its central longitudinal axis, and forming during the aforesaid twisting the longitudinal edges on said polygonal cross-sectioned wire into a helical shape to define a helical recess therebetween, said solid polygonal cross section being fully retained throughout the length of said wire electrode so that electrical current loads and strength characteristics will be unaffected by the formation of said helically formed recesses.
Claim 2
Dependent Claim
112 words
In a method for the manufacture of wire electrodes for the electroerosive cutting of electrially conducting workpieces, which have a surface with projections and recesses, the improvement comprising wherein the wire electrode is manufactured of a flexible single solid wire having a polygonal cross section by twisting the wire about its central longitudinal axis, and forming during the aforesaid twisting the longitudinal edges on said polygonal cross-sectioned wire into a helical shape to define a helical recess therebetween, said solid polygonal cross section being fully retained throughout the length of said wire electrode so that electrical current loads and strength characteristics will be unaffected by the formation of said helically formed recesses.
Claim 3
Dependent Claim
14 words
The method according to claim 1, wherein the wire has a rectangular cross section.
Claim 4
Dependent Claim
14 words
The method according to claim 1, wherein the wire has a square cross section.
Claim 5
Dependent Claim
14 words
The method according to claim 1, wherein the wire has a triangular cross section.
Claim 6
Dependent Claim
88 words
A wire electrode for the electroerosive cutting of electrically conducting workpieces, wherein the wire electrode is a flexible single wire which has a solid polygonal cross section and is twisted about its central longitudinal axis, and wherein longitudinally extending edges on said polygonal cross-sectioned wire are helically formed to define a helical recess therebetween, said solid polygonal cross section being fully retained throughout the length of said wire electrode so that electrical current loads and strength characteristics will be unaffected by the formation of said helically formed recesses.
Claim 7
Dependent Claim
88 words
A wire electrode for the electroerosive cutting of electrically conducting workpieces, wherein the wire electrode is a flexible single wire which has a solid polygonal cross section and is twisted about its central longitudinal axis, and wherein longitudinally extending edges on said polygonal cross-sectioned wire are helically formed to define a helical recess therebetween, said solid polygonal cross section being fully retained throughout the length of said wire electrode so that electrical current loads and strength characteristics will be unaffected by the formation of said helically formed recesses.
Claim 8
Dependent Claim
12 words
The wire according to claim 5, wherein said polygonal shape is rectangular.
Claim 9
Dependent Claim
12 words
The wire according to claim 5, wherein said polygonal shape is triangular.
Claim 10
Dependent Claim
12 words
The wire according to claim 5, wherein said polygonal shape is square.
Claim 11
Dependent Claim
15 words
The wire according to claim 5, wherein said polygonal shape has at least five corners.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |