US3845647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stator assemblies for dynamo electric machines
Assignee: Lucas Electrical Co Ltd
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Filing: 1972-10-10
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Granted: 1974-11-05
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Expires: 1992-10-10
Abstract
Abstract A method of forming a stator assembly for a dynamo electric machine. The stator assembly is of the kind including a laminated member in the form of a helically coiled metal strip, and the method includes driving the metal strip into a former which coils the strip helically. As the strip is coiled helically a set is imparted to the strip so that the convolutions of the coiled strip produced are biased towards one another in an axial direction by their own inherent resilience. Apparatus for performing the method includes a former having a cylindrical concave surface. A driving arrangement drives the metal strip against the cylindrical concave surface of the former so that the strip is deformed into a helical coil. The apparatus includes means for example including a pair of rolls between which the strip passes, and which deflect the strip, so as to impart to the strip a set such that the convolutions of the helically coiled strip produced are biased in an axial direction towards one another.
Inventors
- 👤 R Cockin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:21
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K15/026; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A method of forming a stator assembly for a dynamo electric machine, of the kind including a laminated member in the form of a helically coiled metal strip, comprising, driving a metal strip into a former which coils the strip helically, and, imparting to the strip as it is coiled a set such that the convolutions of the coiled strip produced are biassed towards one another in an axial direction into facial contact with one another by their own inherent resilience, so that the helical coil of metal strip is produced in a collapsed condition, the set being imparted to the strip by deflecting the strip relative to its initial plane during passage through the former.
Claim 2
Independent Claim
116 words
A method of forming a stator assembly for a dynamo electric machine, of the kind including a laminated member in the form of a helically coiled metal strip, comprising, driving a metal strip into a former which coils the strip helically, and, imparting to the strip as it is coiled a set such that the convolutions of the coiled strip produced are biassed towards one another in an axial direction into facial contact with one another by their own inherent resilience, so that the helical coil of metal strip is produced in a collapsed condition, the set being imparted to the strip by deflecting the strip relative to its initial plane during passage through the former.
Claim 3
Dependent Claim
142 words
Apparatus for use in forming a stator assembly, for a dynamo electric machine, of the kind including a laminated member in the form of a helically coiled metal strip, the apparatus including a former having a cylindrical concave surface, a driving arrangement for driving metal strip against said surface so that said strip is deformed into a helical coil, and, means for imparting to the strip a set such that the convolutions of the helically coiled strip are biassed in an axial direction whereby the apparatus produces a collapsed helical coil of metal strip, said means imparting said set to said strip by deflecting said strip relative to its initial plane, and said means being so positioned in the path of movement of the strip through the apparatus that the set is imparted to the strip during its passage through the former.
Claim 4
Dependent Claim
142 words
Apparatus for use in forming a stator assembly, for a dynamo electric machine, of the kind including a laminated member in the form of a helically coiled metal strip, the apparatus including a former having a cylindrical concave surface, a driving arrangement for driving metal strip against said surface so that said strip is deformed into a helical coil, and, means for imparting to the strip a set such that the convolutions of the helically coiled strip are biassed in an axial direction whereby the apparatus produces a collapsed helical coil of metal strip, said means imparting said set to said strip by deflecting said strip relative to its initial plane, and said means being so positioned in the path of movement of the strip through the apparatus that the set is imparted to the strip during its passage through the former.
Claim 5
Dependent Claim
56 words
Apparatus as claimed in claim 2 wherein said means includes a pair of rolls within the former between which the strip passes, the positions of the rolls in relation to each other and to the remainder of the former being such that the strip is deflected relative to its initial plane during passage through the former.
Claim 6
Dependent Claim
24 words
Apparatus as claimed in claim 3 wherein said means further includes an arcuate ramp which deflects the strip during its exit from the former.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 3 wherein the position of said rolls relative to one another is adjustable.
Claim 8
Dependent Claim
21 words
Apparatus as claimed in claim 3 wherein the orientation of said rolls relative to the remainder of the former is adjustable.
Claim 9
Dependent Claim
32 words
Apparatus as claimed in claim 3 wherein the axes of said rolls are parallel, radial with respect to the former, and inclined at a small angle to the plane of the strip.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |