US3819967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesively bonded commutator
Assignee: General Electric Co
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Filing: 1972-03-01
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Granted: 1974-06-25
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Expires: 1992-03-01
Abstract
Abstract A commutator in which a base member having an outer cylindrical surface has metallic, electrically conductive commutating segments adhesively bonded to the cylindrical surface by a relatively thin layer of an adhesive material which is electrically non-conductive and has high dielectric strength. The base member is formed of a material characterized by extreme rigidity and thermal stability relative to the adhesive material, and the diameter of the base member is at least one hundred times greater than the thickness of the adhesive layer. The adhesive material is preferably selected from the group of adhesives consisting of epoxies and polyimides.
Inventors
- 👤 J Binder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:58
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; H01R; H01R39/00; H01R39/02; H01R39/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
24 words
A bonded commutator as defined by claim 1 wherein said adhesive material is selected from the group of adhesives consisting of epoxies and polyimides.
Claim 2
Dependent Claim
36 words
A bonded commutator as defined by claim 2 wherein the diameter of said base member is at least 2.000 inches and the thickness of said adhesive layer is in the range of 0.020 inch or less.
Claim 3
Dependent Claim
24 words
A bonded commutator as defined by claim 2 wherein the thickness of said adhesive layer is within the range of 0.001 to 0.020 inch.
Claim 4
Dependent Claim
101 words
A bonded commutator comprising: a base member having a cylindrical outer surface, a plurality of metallic, electrically conductive commutating segments circumferentially spaced about said outer surface, a layer of high temperature resistant adhesive material interposed between each of said segments and said outer surface to bond said base member and said segments into an integral assembly, said adhesive material being electrically non-conductive and having high dielectric strength, said adhesive material being selected from the group of adhesives consisting of epoxies and polyimides, and spacing means disposed in said layer of adhesive material for establishing a minimum thickness of said adhesive layer.
Claim 5
Dependent Claim
47 words
A bonded commutator as defined by claim 5 in which said spacing means comprises glass beads of substantially uniform size, the diameter of said base member being at least 2.000 inches and the thickness of said adhesive layer being in the range of 0.001 to 0.020 inch.
Claim 6
Dependent Claim
17 words
A bonded commutator as defined by claim 2 in which said base member is comprised of steel.
Claim 7
Dependent Claim
50 words
A bonded commutator as defined by claim 7 in which said commutating segments are comprised of copper and in which said steel base member has a diameter of at least 2.000 inches and in which the thickness of said adhesive layer is in the range of 0.001 to 0.020 inch.
Claim 8
Dependent Claim
50 words
A bonded commutator as defined by claim 7 in which said commutating segments are comprised of aluminum and in which said steel base member has a diameter of at least 2.000 inches and in which the thickness of said adhesive layer is in the range of 0.001 to 0.020 inch.
Claim 9
Dependent Claim
65 words
A bonded commutator as defined by claim 7 further comprising spacing means disposed in said layer of adhesive material for establishing a minimum thickness of said adhesive layer consistent with suitable adhesive and strength and required electrical properties, the diameter of said base member being at least 2.000 inches and the thickness of said adhesive layer being in the range of 0.001 to 0.020 inch.
Claim 10
Dependent Claim
17 words
A commutator, as recited in claim 2, wherein said adhesive layer comprises a cured cycloaliphatic epoxide resin.
Claim 11
Dependent Claim
24 words
A commutator, as recited in claim 11, wherein said cycloaliphatic epoxide resin has been cured with a mixture of borontrifluoride monoethylamine and polyethylene glycol.
Claim 12
Dependent Claim
20 words
A commutator, as recited in claim 2 wherein said adhesive layer comprises a polyanhydride cured polyglycidol ether of bisphenol A.
Claim 13
Dependent Claim
68 words
A commutator, as recited in claim 2 wherein said adhesive layer is produced by heat-curing a mixture, compressively held between said base element and said commutation segments, said mixture comprising, by weight, 50-55 percent diglycidyl ether of bisphenol A having a viscosity of 10,000 to 16,000 centipoises at 25*C and having an epoxide equivalent weight of 185-192, and 40-50 percent pyromellitic dianhydride, exclusive of nonreactive fillers and pigments.
Claim 14
Dependent Claim
35 words
A commutator, as recited in claim 2 wherein said adhesive layer comprises a diaminodiphenylsulfone-cured polyglycidol ether of tetraphenyl ethane including 20-25 percent, by weight, based on the weight of cured resin, of fine aluminum powder.
Claim 15
Dependent Claim
68 words
A commutator, as recited in claim 2 wherein said adhesive layer is produced by heating a mixture, compressively held between said base element and said commutation segments, said mixture comprising, by weight, 55-60 percent polyglycidyl ether of tetraphenylene ethane having an epoxide equivalent weight of 210 to 240, approximately 20 percent diaminodiphenylsulfone, approximately 1 percent of a Lewis acid type catalyst, and 20-25 percent of fine aluminum powder.
Claim 16
Dependent Claim
16 words
A commutator, as recited in claim 16 wherein said Lewis acid type catalyst is borontrifluoride monoethylamine.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |