Patent US4758757A successfully refreshed from Google Patents.
US4758757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-damping device for miniature motor brushgear
Assignee: Mabuchi Motor Co Ltd
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Filing: 1986-11-20
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Granted: 1988-07-19
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Expires: 2006-11-20
Abstract
Abstract A vibration-damping device for miniature motor brushgear comprising brush arms having sliding parts at the tips of a plurality of fork-like prongs, terminals and brush bases; the brush bases are supported by a motor case cover and the brush arm sliding parts make sliding contact with a motor commutator by the resiliency of the brush arm in which a soft photo-setting resin is applied on areas at the tips of the brush arms, other than the sliding parts, in such a manner that the fork-like prongs and/or gaps between the prongs are covered by the soft photo-setting resin. The fork-like prongs are individually and separately movable by controlling the flexibility of the soft photo-setting resin, by setting the coating weight or hardness after cure of the soft photo-setting resin to a predetermined value, or by applying soft photo-setting resin having different hardness values in multiple layers.
Inventors
- 👤 Takeshi Okumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:27
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/14; H02K5/143; H02K5/145; H01; H01R; H01R39/00; H01R39/02; H01R39/38; H01R39/39
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A vibration-damping device for miniature motor brushgear comprising brush arms having sliding parts at the tips of fork-like prongs, terminals and brush bases; said brush bases being supported by a motor case cover and said sliding parts being adapted to make sliding contact with a motor commutator, and characterized in that a soft photo-setting resin is applied on said brush arms, except areas at which said brush arms make contact with said commutator, in such a manner that said soft photo-setting resin covers not only said fork-like prongs but gaps between said fork-like prongs, and each of said fork-like prongs being independently movable by resiliency of said soft photo-setting resin.
Claim 2
Dependent Claim
110 words
A vibration-damping device for miniature motor brushgear comprising brush arms having sliding parts at the tips of fork-like prongs, terminals and brush bases; said brush bases being supported by a motor case cover and said sliding parts being adapted to make sliding contact with a motor commutator, and characterized in that a soft photo-setting resin is applied on said brush arms, except areas at which said brush arms make contact with said commutator, in such a manner that said soft photo-setting resin covers not only said fork-like prongs but gaps between said fork-like prongs, and each of said fork-like prongs being independently movable by resiliency of said soft photo-setting resin.
Claim 3
Dependent Claim
34 words
A vibration-damping device for miniature motor brushgear as claimed in claim 1 wherein said soft photo-setting resin forms a coated surface, including not only said brush arms but also part of said brush bases.
Claim 4
Dependent Claim
47 words
A vibration-damping device for miniature motor brushgear as claimed in claim 1 wherein said soft photo-setting resin is applied up to said motor case cover and an area close to terminal insertion holes provided on said motor case cover to form a soft photo-setting resin coated surface.
Claim 5
Dependent Claim
38 words
A vibration-damping device for miniature motor brushgear as claimed in claim 1 wherein said motor case cover and said soft photo-setting resin coated surface are bridged by a soft photo-setting resin at the mid-point of ssid brush arms.
Claim 6
Dependent Claim
43 words
A vibration-damping device for miniature motor brushgear as claimed in claim 1 wherein the coating weight of said soft photo-setting resin is set to a predetermined value to maintain the independence of each of said fork-like prongs while ensuring the vibration-damping effect thereof.
Claim 7
Dependent Claim
44 words
A vibration-damping device for miniature motor brushgear as claimed in claim 1 wherein the hardness after cure of said soft photo-setting resin is set to a predetermined value to maintain the independence of each of said fork-like prongs while ensuring the vibration-damping effect thereof.
Claim 8
Dependent Claim
42 words
A vibration-damping device for miniature motor brushgear as claimed in claim 1 wherein said soft photo-setting resin having different hardness values is applied in multiple layers to maintain the independence of each of said fork-like prongs while ensuring the vibration-damping effect thereof.
Claim 9
Dependent Claim
106 words
A vibration-damping device for a miniature motor brushgear comprising: at least one brush arm having fork-like prongs with tips having sliding parts, a brush arm terminal and a brush base; a motor case cover supporting said brush base to allow said sliding part to make sliding contact with a motor commutator; a soft photo-setting resin applied on said brush arms from said brush base up to said sliding part, said soft photo-setting resin covering a portion of said fork-like prongs and also covering a portion bridging said fork-like prongs, each of said fork-like prongs being independently movable because of the resiliency of said soft photo-setting resin.
Claim 10
Dependent Claim
106 words
A vibration-damping device for a miniature motor brushgear comprising: at least one brush arm having fork-like prongs with tips having sliding parts, a brush arm terminal and a brush base; a motor case cover supporting said brush base to allow said sliding part to make sliding contact with a motor commutator; a soft photo-setting resin applied on said brush arms from said brush base up to said sliding part, said soft photo-setting resin covering a portion of said fork-like prongs and also covering a portion bridging said fork-like prongs, each of said fork-like prongs being independently movable because of the resiliency of said soft photo-setting resin.
Claim 11
Dependent Claim
46 words
A vibration-damping device for a miniature motor brush according to claim 8, wherein: said soft photo-setting resin is applied in multiple layers each layer having different hardness values so as to maintain the independence of each of said fork-like prongs while insuring the vibration-damping effect thereof.
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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |