Patent US5552652A successfully refreshed from Google Patents.
US5552652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutator with improved connection between carbon and metal segments
Assignee: KUNIMITSU CARBON INDUSTRY Co Ltd
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Filing: 1994-12-01
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Granted: 1996-09-03
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Expires: 2014-12-01
Abstract
Abstract A flat commutator includes a circular arrangement of sectorial carbon segments made of conductive carbon providing commutating surface of the commutator, metallic segments attached to respective of the carbon segments, and a hub body of synthetic resin. The metallic segments have fixing members encroaching into inner and outer peripheral surfaces of the carbon segments, thereby fixing the carbon segments to the metallic segments. The hub body encloses at least fixed portions of the inner and outer peripheral surfaces of the carbon segments that engage with the fixing members of the metallic segments.
Inventors
- 👤 Shuji Shimoyama
- 👤 Iwao Yanagizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:02
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; H01R43/08; H01R39/00; H01R39/02; H01R39/04; H01R39/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A flat commutator comprising: a plurality of carbon segments formed of conductive carbon material, said carbon segments being arranged in a circular arrangement and defining a commutating surface of said commutator, and each said carbon segment having a sectorial configuration including an inner peripheral surface and an outer peripheral surface; a plurality of metallic segments, each said metallic segment having fixing members encroaching into fixed portions of said inner and outer peripheral surfaces of a respective said carbon segment and thereby fixing said each metallic segment to said respective carbon segment; and a hub body formed of synthetic resin and enclosing at least said fixed portions of said inner and outer peripheral surfaces of all said carbon segments.
Claim 2
Dependent Claim
118 words
A flat commutator comprising: a plurality of carbon segments formed of conductive carbon material, said carbon segments being arranged in a circular arrangement and defining a commutating surface of said commutator, and each said carbon segment having a sectorial configuration including an inner peripheral surface and an outer peripheral surface; a plurality of metallic segments, each said metallic segment having fixing members encroaching into fixed portions of said inner and outer peripheral surfaces of a respective said carbon segment and thereby fixing said each metallic segment to said respective carbon segment; and a hub body formed of synthetic resin and enclosing at least said fixed portions of said inner and outer peripheral surfaces of all said carbon segments.
Claim 3
Dependent Claim
22 words
A flat commutator as claimed in claim 1, wherein said fixed portions comprise recesses formed in said inner and outer peripheral surfaces.
Claim 4
Dependent Claim
43 words
A flat commutator as claimed in claim 2, wherein said fixing members of each said metallic segment extend from inner and outer peripheral portions thereof and fit in respective said recesses in said inner and outer peripheral surfaces of said respective carbon segment.
Claim 5
Dependent Claim
22 words
A flat commutator as claimed in claim 1, wherein each said metallic segment has an engagement member embedded in said hub body.
Claim 6
Dependent Claim
25 words
A flat commutator as claimed in claim 4, wherein said engagement member is positioned outwardly of an inner said fixing member of said metallic segment.
Claim 7
Dependent Claim
20 words
A flat commutator as claimed in claim 1, wherein each said metallic segment has a radially outwardly projecting connection terminal.
Claim 8
Dependent Claim
18 words
A flat commutator as claimed in claim 6, wherein said connection terminal extends outwardly through said hub body.
Claim 9
Dependent Claim
72 words
A flat commutator as claimed in claim 1, wherein said hub body includes an inner portion covering inner peripheral ends of all of said carbon segments and said metallic segments, an outer portion covering outer peripheral ends of all of said carbon segments and said metallic segments, and a lower portion joining said inner and outer portions and covering respective sides of all of said metallic segments opposite said respective carbon segments.
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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) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |