Patent US3702499A successfully refreshed from Google Patents.
US3702499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a coil
Assignee: ABB Norden Holding AB
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Filing: 1971-02-16
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Granted: 1972-11-14
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Expires: 1991-02-16
Abstract
Abstract A coil having several turns of an insulated conductor is provided with a shrinkage tube of insulating material by producing such relative movement between the conductor and the tube that the end of the conductor passes into the tube and through it a number of times until a portion of all the coil turns is enclosed within the tube. The tube, which may be corrugated to shorten its length during the winding operation, is then heated beginning at one end and expands along and contracts over the wound coil.
Inventors
- 👤 Lars-Goran Virsbreg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:09
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/10; H02K15/105; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/06; H01F41/12; H01F41/125; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
Method of manufacturing a coil (20) comprising several turns of an insulated conductor (1, 21) and provided with at least one layer of insulating material surrounding all the turns, in which such layer consists essentially of a shrinkage tube (5) of insulating material, which comprises fitting the tube in expanded state over one end of the conductor and effecting a continuous relative movement between conductor and tube along a length of conductor corresponding to the length of a coil turn, and after each time a coil turn length has been passed fitting the tube over said end of the conductor and effecting such relative movement successively until the tube encloses a portion of all of the coil turns, and shrinking the tube to exert pressure on the bundle of conductors inside.
Claim 2
Dependent Claim
131 words
Method of manufacturing a coil (20) comprising several turns of an insulated conductor (1, 21) and provided with at least one layer of insulating material surrounding all the turns, in which such layer consists essentially of a shrinkage tube (5) of insulating material, which comprises fitting the tube in expanded state over one end of the conductor and effecting a continuous relative movement between conductor and tube along a length of conductor corresponding to the length of a coil turn, and after each time a coil turn length has been passed fitting the tube over said end of the conductor and effecting such relative movement successively until the tube encloses a portion of all of the coil turns, and shrinking the tube to exert pressure on the bundle of conductors inside.
Claim 3
Dependent Claim
104 words
Method according to claim 1, which comprises fitting the shrinkage tube (5) over a frame (2) located in a plane and having an opening intended therefor, and attaching said conductor end to the frame, giving the frame a rotary movement in said plane in such a way that the conductor is wound with several turns on the frame while at least partially limiting the movement of the shrinkage tube in said plane, removing the shrinkage tube from the frame by displacing it along the enclosed bundle of conductors and through said opening, and removing the coil with the surrounding shrinkage tube from the frame.
Claim 4
Dependent Claim
30 words
Method according to claim 1, which comprises coiling said conductor (21) to form the desired number of turns, and thereafter producing such relative movement between shrinkage tube (22) and conductor.
Claim 5
Dependent Claim
30 words
Method according to claim 1, in which said shrinkage tube in expanded state is corrugated, whereby when the corrugation is flattened out during shrinkage an increase in length is produced.
Claim 6
Dependent Claim
26 words
Method according to claim 1 in which the final shrinking of the shrinkage tube comprises a progressive shrinking in the longitudinal direction of the shrinkage tube.
Claim 7
Dependent Claim
25 words
Method according to claim 1, which comprises positioning a layer of yielding insulating material between the coil and the shRinkage tube before shrinking the tube.
Claim 8
Dependent Claim
37 words
Method according to claim 1, which comprises introducing an insulating material which is liquid at a temperature lower than or equal to the maximum temperature of the shrinkage tube during shrinking into the shrinkage tube before shrinking.
Claim 9
Dependent Claim
69 words
Method according to claim 7, in which said liquid insulating material is supplied, at least at the first part of the shrinkage tube to be shrunk, in a quantity per unit length of the coil side greater than the average unit quantity intended for the completely insulated coil, and producing progressive contraction of the tube to effect final distribution of this insulating material along the circumference of the coil.
Claim 10
Dependent Claim
21 words
Method according to claim 1, in which the shrinkage tube in shrunk state surrounds at least 90% of the coil circumference.
Claim 11
Dependent Claim
23 words
Method according to claim 1, which comprises applying a plurality of shrinkage tubes arranged along the coil circumference without contact with each other.
Claim 12
Dependent Claim
41 words
Method according to claim 1, which comprises applying a plurality of shrinkage tube portions initially and in expanded condition arranged one outside the other with a relatively high degree of overlapping, and substantially reducing the overlapping prior to the final shrinking.
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |