Patent US3831267A successfully refreshed from Google Patents.
US3831267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a sleeve armature
Assignee: Hitachi Ltd
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Filing: 1973-03-09
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Granted: 1974-08-27
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Expires: 1993-03-09
Abstract
Abstract A sleeve armature and a method of manufacturing the same in which a number of component coils composing the winding are uniformly mounted flatly and in a partly superimposed manner on the circumference of an inner mold, and after the coils are impregnated with a thermosetting resin, the coils mounted on the inner mold are enclosed with a thermocontracting coating, and then the structure is heated. The thermocontracting coating contracts and applies a uniform pressing force to the coils and the thermosetting resin, and at the same time the thermosetting resin is set.
Inventors
- 👤 K Onishi
- 👤 S Yamashita
- 👤 M Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:44
CPC Classifications
H; H02; H02K; H02K3/00; H02K15/00; H02K15/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
A method of manufacturing a sleeve armature comprising the steps of withdrawing a former from a series of coils wound on the former in a predetermined form, pressing the series of coils against a plane in a row so that the effective straight line portions of lead wires constituting the coils close sufficiently without overlapping each other, mounting the pressed series of coils on the circumference of an inner mold member, impregnating the series of coils mounted on the inner mold member with a thermosetting resin, surrounding the series of coils mounted on the inner mold member with a thermocontracting coating having an inner diameter larger than the outer diameter of the coils, heating the series of coils to set the thermosetting resin and at the same time heating the thermocontracting coating to cause contraction thereof so that a uniform pressing force is applied to the coils and thermosetting resin from the circumference thereof, and withdrawing the thermocontracting coating from the coils after the thermosetting resin impregnated into the coils has been set.
Claim 2
Independent Claim
173 words
A method of manufacturing a sleeve armature comprising the steps of withdrawing a former from a series of coils wound on the former in a predetermined form, pressing the series of coils against a plane in a row so that the effective straight line portions of lead wires constituting the coils close sufficiently without overlapping each other, mounting the pressed series of coils on the circumference of an inner mold member, impregnating the series of coils mounted on the inner mold member with a thermosetting resin, surrounding the series of coils mounted on the inner mold member with a thermocontracting coating having an inner diameter larger than the outer diameter of the coils, heating the series of coils to set the thermosetting resin and at the same time heating the thermocontracting coating to cause contraction thereof so that a uniform pressing force is applied to the coils and thermosetting resin from the circumference thereof, and withdrawing the thermocontracting coating from the coils after the thermosetting resin impregnated into the coils has been set.
Claim 3
Dependent Claim
38 words
A method according to claim 1, wherein the step of mounting the pressed series of coils include securing the coils at a small portion of the straight line portion thereof about the circumference of the inner mold member.
Claim 4
Dependent Claim
26 words
A method according to claim 1, further comprising forming the coils and the thermosetting resin in a substantially very thin layer as a sleeve armature winding.
Claim 5
Dependent Claim
32 words
A method according to claim 1, further comprising providing a tubular sleeve armature winding of uniform thickness about the circumference thereof of approximately the thickness of a lead wire of the coils.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |