Patent US3586893A successfully refreshed from Google Patents.
US3586893A
Expired / Lapsed
US
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Armature core
Assignee: Toshiba Corp
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Filing: 1969-10-28
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Granted: 1971-06-22
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Expires: 1989-10-28
Abstract
Abstract A moulded armature core comprises a moulded cylindrical block of magnetic material, having a plurality of slots disposed in parallel along the peripheral portion thereof in a manner to extend lengthwise of the block, said slots being so tapered as to progressively decrease in both depth and width.
Inventors
- 👤 Harumichi Okamoto
- 👤 Kiyoshi Fukui
- 👤 Teruo Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:48
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/26; H02K1/12; H02K1/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A moulded armature core comprising a moulded cylindrical block of magnetic material having a plurality of tapered slots disposed substantially in parallel along the peripheral portion of said block and extending lengthwise of said block, said slots being tapered so as to progressively decrease in both depth and width along the length of said block.
Claim 2
Dependent Claim
55 words
A moulded armature core comprising a moulded cylindrical block of magnetic material having a plurality of tapered slots disposed substantially in parallel along the peripheral portion of said block and extending lengthwise of said block, said slots being tapered so as to progressively decrease in both depth and width along the length of said block.
Claim 3
Dependent Claim
140 words
An armature assembly for an induction motor comprising: first and second moulded armature cores each of said armature cores comprising a moulded cylindrical block of magnetic material having a plurality of tapered slots disposed substantially in parallel along the peripheral portion of said block and extending lengthwise of said block, said slots being tapered so as to progressively decrease in both depth and width along the length of said block, the cross section of said slots being dimensionally varied at a predetermined rate in the lengthwise direction of said block; and a shaft on which said armature cores are mounted such that the slots of said first armature core are displaced a half-pitch with respect to the slots of said second armature core, and such that the slots of said first and second armature cores are tapered in opposite directions.
Claim 4
Dependent Claim
140 words
An armature assembly for an induction motor comprising: first and second moulded armature cores each of said armature cores comprising a moulded cylindrical block of magnetic material having a plurality of tapered slots disposed substantially in parallel along the peripheral portion of said block and extending lengthwise of said block, said slots being tapered so as to progressively decrease in both depth and width along the length of said block, the cross section of said slots being dimensionally varied at a predetermined rate in the lengthwise direction of said block; and a shaft on which said armature cores are mounted such that the slots of said first armature core are displaced a half-pitch with respect to the slots of said second armature core, and such that the slots of said first and second armature cores are tapered in opposite directions.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |