Patent US4677330A successfully refreshed from Google Patents.
US4677330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature motor with frangible magnet retaining boss
Assignee: Mabuchi Motor Co Ltd
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Filing: 1986-09-12
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Granted: 1987-06-30
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Expires: 2006-09-12
Abstract
Abstract A miniature motor comprising a hollow tubular-shaped large case having a magnet along the inner circumferential surface thereof, and a small case (end bell) fitted to the large case and having brush holders, made of a synthetic resin, and magnet retaining bosses making contact with the magnet; and characterized in that each of the brush holders has a boss insert hole into which the magnet retaining boss is press-fitted; one end of the magnet retaining boss being pushed by the magnet, at small case installation, causing the magnet retaining boss to be press-fitted into the boss insert hole, whereby the small case is fitted into the large case in a state where the end of the magnet retaining boss makes contact with the magnet.
Inventors
- 👤 Tsutomu Watanabe
- 👤 Tsutomu Saya
- 👤 Hiroshi Takashima
- 👤 Ryoichi Someya
- 👤 Hiroaki Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:37
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/14; H02K1/00; H02K1/06; H02K1/12; H02K1/17; H02K23/00; H02K23/02; H02K23/04; H02K5/143; H02K5/145; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
A miniature motor comprising a hollow tubular large case having a magnet along the inner circumferential surface thereof, and a small case fitted to said large case and having brush holders, made of a synthetic resin, and magnet retaining bosses making contact with said magnet, and characterized in that each of said brush holders has a boss insert hole into which said magnet retaining boss is press-fitted, one end of said magnet retaining boss is pushed by said magnet, at small case installation, causing said magnet retaining boss to be press-fitted into said boss insert hole, whereby said small case is fitted into said large case in a state where the end of said magnet retaining boss makes contact with said magnet.
Claim 2
Dependent Claim
122 words
A miniature motor comprising a hollow tubular large case having a magnet along the inner circumferential surface thereof, and a small case fitted to said large case and having brush holders, made of a synthetic resin, and magnet retaining bosses making contact with said magnet, and characterized in that each of said brush holders has a boss insert hole into which said magnet retaining boss is press-fitted, one end of said magnet retaining boss is pushed by said magnet, at small case installation, causing said magnet retaining boss to be press-fitted into said boss insert hole, whereby said small case is fitted into said large case in a state where the end of said magnet retaining boss makes contact with said magnet.
Claim 3
Dependent Claim
56 words
A miniature motor set forth in claim (1) wherein said magnet retaining boss provided on said small case is formed integrally with said brush holder by means of a knockout portion which can be cut away when a pushing force is applied to the end thereof, each of said brush holders having a boss insert hole.
Claim 4
Dependent Claim
51 words
A miniature motor set forth in claim (1) wherein said small case has such a construction that magnet retaining bosses, provided separated from said brush holders, are press-fitted into said boss insert holes, and press-fitting is completed by forcing the ends of said magnet retaining bosses into said boss insert holes.
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) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |