Patent US3908265A successfully refreshed from Google Patents.
US3908265A
Expired / Lapsed
US
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Method of making commutator structure for the rotor of a dynamo-electric machine
Assignee: BBC Brown Boveri AG Germany
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Filing: 1974-02-26
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Granted: 1975-09-30
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Expires: 1994-02-26
Abstract
Abstract A commutator structure for use on the rotor of a dynamo-electric machine includes a cylindric assembly of commutator segments held together by shrink rings. The commutator segment assembly is mounted on a cylindric support part such as a bush or the rotor shaft itself, there being established between the commutator segment assembly and support part an annulus with an elastic layer. Preferably the elastic layer is constituted by absorbant material such as fiber glass impregnated with a thermo-setting synthetic resin.
Inventors
- 👤 Werner Heil
- 👤 Heinrich Moser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:18
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; H01R39/00; H01R39/02; H01R39/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
The method of producing and mounting a commutator structure for a dynamo-electric machine on a cylindric support part thereof which comprises the steps of: assembling the commutator segments in a cylindric array, applying shrink rings to said cylindric array of commutator segments to secure them together and establish a predetermined arch pressure thereon, bringing said cylindric array of commutator segments into position over said cylindric support part, the inner diameter of said cylindric array of commutator segments being greater than the outer diameter of said support part thereby to establish an annulus therebetween, filling said annulus with an elastic insulating material comprising glass fibers impregnated with a thermo-set synthetic resin, and cementing said elastic insulating material to the inner periphery of said shrink ring secured commutator segment array and to the periphery of said cylindric support part, the elasticity of said insulating material which fills said annulus serving to prevent any possible reduction in the arch pressure produced by said shrink rings.
Claim 2
Independent Claim
162 words
The method of producing and mounting a commutator structure for a dynamo-electric machine on a cylindric support part thereof which comprises the steps of: assembling the commutator segments in a cylindric array, applying shrink rings to said cylindric array of commutator segments to secure them together and establish a predetermined arch pressure thereon, bringing said cylindric array of commutator segments into position over said cylindric support part, the inner diameter of said cylindric array of commutator segments being greater than the outer diameter of said support part thereby to establish an annulus therebetween, filling said annulus with an elastic insulating material comprising glass fibers impregnated with a thermo-set synthetic resin, and cementing said elastic insulating material to the inner periphery of said shrink ring secured commutator segment array and to the periphery of said cylindric support part, the elasticity of said insulating material which fills said annulus serving to prevent any possible reduction in the arch pressure produced by said shrink rings.
Claim 3
Dependent Claim
43 words
The method as defined in claim 1 of producing and mounting a commutator structure for a dynamo-electric machine wherein said cylindric support part includes a metallic bush having a sleeve of electrical insulating material thereon which is cemented to said elastic insulating material.
Claim 4
Dependent Claim
35 words
The method as defined in claim 2 of producing and mounting a commutator structure for a dynamo-electric machine on a cylindrical support part thereof wherein said sleeve of insulating material includes a glass fiber fabric.
Claim 5
Dependent Claim
32 words
The method as defined in claim 2 of producing and mounting a commutator structure for a dynamo-electric machine on a cylindrical support part thereof wherein said sleeve of insulating material includes mica.
Claim 6
Dependent Claim
32 words
The method as defined in claim 1 of producing and mounting a commutator structure for a dynamo-electric machine wherein the glass fiber in said elastic insulating material is formed as a mat.
Claim 7
Dependent Claim
35 words
The method as defined in claim 1 of producing and mounting a commutator structure for a dynamo-electric machine wherein the glass fiber in said elastic insulating material is formed as a closely wound helical coil.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |