US3726005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing flat-wire field coils
Assignee: ISKRA LAVOD AVTOMATIZACIJO ZDRUZENEM POD ISKRA YU
•
Filing: 1971-03-17
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Granted: 1973-04-10
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Expires: 1991-03-17
Abstract
Abstract A method of manufacturing flat-wire field coils for an electric machine, especially a starter for an internal combustion engine, wherein one metallic surface only of a metal strip is coated with an adhesive lacquer and particles of rigid insulating material are disposed upon this surface and adhere to the adhesive lacquer thereof. Non-adherent particles are removed and the metal strip is coiled so that the adherent particles space apart the successive turns. The last turn is fixed to the coil which is heated and contacted with a suspension of thermoplastic or duroplastic resin powder to form a sheath around the coil. The coil is then bent to the desired shape of the field coil.
Inventors
- 👤 E Prostor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:11
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/32; H02K3/325; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
The method defined in claim 1 wherein said particles are composed of a thermoplastic and said coil remains unheated following the bonding of the thermoplastic particles to the coil.
Claim 2
Dependent Claim
28 words
The method defined in claim 1 wherein said coil is coated with a duroplastic and is heated subsequent to application of the particles of duroplastic to the coil.
Claim 3
Dependent Claim
24 words
The method defined in claim 1 wherein said last turn is secured to the remainder of the coil by binding it with a cord.
Claim 4
Dependent Claim
43 words
The method defined in claim 1 wherein said last turn is secured to the remainder of said coil by contacting said last turn with a pair of spaced apart electrodes and passing an electric current through said strip to heat said last turn.
Claim 5
Dependent Claim
34 words
The method defined in claim 1, further comprising the step of maintaining termini of said strip free from said lacquer and the insulating particles applied in step(b)whereby said termini lie outwardly of said sheath.
Claim 6
Dependent Claim
28 words
The method defined in claim 1 wherein the particles applied to said coil are composed of thermoplastic selected from the group which consists of teflon, polyamides and pentones.
Claim 7
Dependent Claim
17 words
The method defined in claim 1 wherein the powder applied to said coil is an epoxy resin.
References Cited (Backward Citations)
US1751971A
Cited
US3037885A
Cited
US3145127A
Cited
US3418710A
Cited
US3440587A
Cited
US3518755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |