Patent US4369389A successfully refreshed from Google Patents.
US4369389A
Expired / Lapsed
US
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Device for securing winding bars in slots of electric machines, especially turbo-generators
Assignee: Kraftwerk Union AG
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Filing: 1981-04-28
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Granted: 1983-01-18
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Expires: 2001-04-28
Abstract
Abstract Device for securing winding bars in slots of electric machines, including at least one winding bar having sides and being disposed in each slot, a slot-closing wedge disposed in vicinity of the opening of the slot, at least one wavy slot-closing spring having a given first spring travel distance, and being disposed in the slot in longitudinal direction thereof, the slot-closing spring being formed of glass fabric embedded in a hardenable resin and being compressed by approximately 80% of the given first spring travel distance, and a wavy lateral slot spring having a given second spring travel distance and being disposed between a side of the at least one winding bar and an adjacent side wall of the slot in longitudinal direction of the slot, the lateral slot spring being formed of glass fabric embedded in a hardenable resin and being compressed by at least 85% of the given second spring travel distance.
Inventors
- 👤 Dietrich Lambrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:59
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/32; H02K3/40; H02K3/46; H02K3/48; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
Device for securing winding bars in slots of electric machines, comprising at least one winding bar having sides and being disposed in each slot, a slot-closing wedge disposed in vicinity of the opening of the slot, at least one wavy slot-closing spring having a given first spring travel distance and being disposed in the slot in longitudinal direction thereof, said slot-closing spring being formed of glass fabric embedded in a hardenable resin and being compressed by approximately 80% of said given first spring travel distance, and a wavy lateral slot spring having a given second spring travel distance and being disposed between a side of said at least one winding bar and an adjacent side wall of the slot in longitudinal direction of the slot, said lateral slot spring being formed of glass fabric embedded in a hardenable resin and being compressed by at least 85% of said given second spring travel distance.
Claim 2
Dependent Claim
153 words
Device for securing winding bars in slots of electric machines, comprising at least one winding bar having sides and being disposed in each slot, a slot-closing wedge disposed in vicinity of the opening of the slot, at least one wavy slot-closing spring having a given first spring travel distance and being disposed in the slot in longitudinal direction thereof, said slot-closing spring being formed of glass fabric embedded in a hardenable resin and being compressed by approximately 80% of said given first spring travel distance, and a wavy lateral slot spring having a given second spring travel distance and being disposed between a side of said at least one winding bar and an adjacent side wall of the slot in longitudinal direction of the slot, said lateral slot spring being formed of glass fabric embedded in a hardenable resin and being compressed by at least 85% of said given second spring travel distance.
Claim 3
Dependent Claim
20 words
Device according to claim 1, including an electrically conducting pigment admixed to said hardenable resin of said lateral slot spring.
Claim 4
Dependent Claim
25 words
Device according to claim 1 or 2, wherein said lateral slot spring has corrugations aligned at an angle to the longitudinal direction of the slot.
Claim 5
Dependent Claim
23 words
Device according to claim 3, wherein said angle of alignment of said corrugations to the longitudinal direction of the slot is approximately 45°.
Claim 6
Dependent Claim
21 words
Device according to claim 1 or 2, wherein said lateral slot spring is subdivided in the longitudinal direction of the slot.
Claim 7
Dependent Claim
19 words
Device according to claim 3, wherein said lateral slot spring is subdivided in the longitudinal direction of the slot.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |