Patent US4538085A successfully refreshed from Google Patents.
US4538085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-type D-C electric motor
Assignee: Mitsubishi Electric Corp
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Filing: 1983-04-06
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Granted: 1985-08-27
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Expires: 2003-04-06
Abstract
Abstract A magneto-type D-C electric motor including a cylindrical yoke, field poles consisting of permanent magnets that are adhered onto the inner peripheral surface of the yoke, a bracket coupled to the yoke, an armature which is rotatably supported by the bracket and which is opposed to the field poles in the radial direction, brushes which are brought into slidable contact with the armature to supply electric power thereto, a brush holder which is secured to bracket and which holds brushes, and an engaging member which engages with the brush holder and with the field poles to determine the positions of field poles and brush holder relative to each other in the circumferential direction.
Inventors
- 👤 Toshinori Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:04
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/14; H02K5/143; H02K5/148; H02K1/00; H02K1/06; H02K1/12; H02K1/17; H02K23/00; H02K23/02; H02K23/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A magneto-type D-C electric motor comprising: a cylindrical yoke having first engaging portions; field poles including permanent magnets having second engaging portions, adhered to the inner peripheral surface of said yoke; an armature opposed to said field poles in the radial direction with respect to the axis of rotation of said armature; a bracket coupled to said yoke, surrounding and rotatably supporting said armature; brushes in slidable contact with said armature to supply electric power thereto; a brush holder secured to said bracket and holding said brushes; and an engaging member having a disk portion secured to said brush holder, integral projecting portions fitted to said second engaging portions, and a circumferential portion engaging said first engaging portions and said bracket.
Claim 2
Dependent Claim
121 words
A magneto-type D-C electric motor comprising: a cylindrical yoke having first engaging portions; field poles including permanent magnets having second engaging portions, adhered to the inner peripheral surface of said yoke; an armature opposed to said field poles in the radial direction with respect to the axis of rotation of said armature; a bracket coupled to said yoke, surrounding and rotatably supporting said armature; brushes in slidable contact with said armature to supply electric power thereto; a brush holder secured to said bracket and holding said brushes; and an engaging member having a disk portion secured to said brush holder, integral projecting portions fitted to said second engaging portions, and a circumferential portion engaging said first engaging portions and said bracket.
Claim 3
Dependent Claim
30 words
A motor as in claim 1, wherein said engaging member is a disk-shaped member having said integral projecting portion cut and bent out of the plane of said disk-shaped member.
Claim 4
Dependent Claim
14 words
A motor as in claim 1, wherein said bracket comprises a front end bracket.
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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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |