US3849273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for radiussing an edge or edges of a metallic aerofoil blade
Assignee: Individual
•
Filing: 1973-01-04
•
Granted: 1974-11-19
•
Expires: 1993-01-04
Abstract
Abstract A method of and apparatus for radiussing the edge or edges of a metallic aerofoil blade by electrolytic machining wherein the electrolyte is flowed towards the edge to be machined from a hollow electrode.
Inventors
- 👤 G Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:50
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/02; B23H9/10; Y; Y10; Y10S; Y10S204/00; Y10S204/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A METHOD OF RADIUSSING A LONGITUDINAL EDGE OF A METALLIC AEROFOIL BLADE, COMPRISING THE STEPS OF: PLACING, IN SPACED RELATIONSHIP WITH THE LONGITUDINAL EDGE OF THE METALLIC AEROFOIL BLADE, THE WORKING FACE OF AN ELECTRODE, SAID WORKING FACE; A. HAVING A SLIT, EXTENDING PARALLEL AND DIRECTLY OPPOSITE TO SAID EDGE, FOR DISCHARGE OF ELECTROLYTE AGAINST SAID EDGE, AND B. BEING SO CONFIGURED THAT NO CONSTRAINT IS PLACED BY SAID WORKING FACE UPON THE FLOW OF ELECTROLYTE LEAVING SAID SLIT, PASSING A STREAM OF ELECTROLYTE THROUGH SAID SLIT, AGAINST SAID EDGE, AND THENCE AROUND BOTH SIDES OF SAID AEROFOIL BLADE, AND APPLYING AN ELECTRIC CURRENT TO THE ELECTRODE AND BLADE IN SUCH A MANNER THAT THE ELECTRODE IS CATHODIC AND THE BLADE IS ANODIC
Claim 2
Independent Claim
123 words
A METHOD OF RADIUSSING A LONGITUDINAL EDGE OF A METALLIC AEROFOIL BLADE, COMPRISING THE STEPS OF: PLACING, IN SPACED RELATIONSHIP WITH THE LONGITUDINAL EDGE OF THE METALLIC AEROFOIL BLADE, THE WORKING FACE OF AN ELECTRODE, SAID WORKING FACE; A. HAVING A SLIT, EXTENDING PARALLEL AND DIRECTLY OPPOSITE TO SAID EDGE, FOR DISCHARGE OF ELECTROLYTE AGAINST SAID EDGE, AND B. BEING SO CONFIGURED THAT NO CONSTRAINT IS PLACED BY SAID WORKING FACE UPON THE FLOW OF ELECTROLYTE LEAVING SAID SLIT, PASSING A STREAM OF ELECTROLYTE THROUGH SAID SLIT, AGAINST SAID EDGE, AND THENCE AROUND BOTH SIDES OF SAID AEROFOIL BLADE, AND APPLYING AN ELECTRIC CURRENT TO THE ELECTRODE AND BLADE IN SUCH A MANNER THAT THE ELECTRODE IS CATHODIC AND THE BLADE IS ANODIC
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the stream of electrolyte leaving the slit flows toward the blade substantially in the medial plane of the blade.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein the width of the slit is less than the thickness of the blade in the vicinity of said longitudinal edge.
Claim 5
Dependent Claim
15 words
A method according to claim 1 wherein said working face of the electrode is planar.
Claim 6
Dependent Claim
34 words
A method according to claim 1 wherein said slit is coextensive with the length of the blade and is shaped so that a surface medial of the slit intersects the blade substantially medially thereof.
Claim 7
Dependent Claim
27 words
A method according to claim 5 wherein the width of the slit is less than the thickness of the blade in the vicinity of said longitudinal edge.
Claim 8
Dependent Claim
15 words
A method according to claim 6 wherein said working face of the electrode is planar.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |