US3882336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor armature core
Assignee: Briggs and Stratton Corp
•
Filing: 1974-05-20
•
Granted: 1975-05-06
•
Expires: 1994-05-20
Abstract
Abstract An armature core assembly in which the heads of the circumferentially spaced T-shaped teeth that form the peripheral portion of the laminated coil-receiving core have their opposite end portions taperingly deformed to widen the entrances to the reentrant coil receiving spaces or slots between the T-shaped teeth at opposite ends of the core. A preformed plastic shield or cap of the same size and shape as the laminations which comprise the core, completely covers each end of the core and has protective flanges that embrace the ends of its T-shaped teeth, including the head, the taperingly reduced width of the end portions of the head providing space for those portions of the protective flanges that embrace the heads, so that the presence of these protective flanges does not objectionably reduce the width of the entrances to the wire receiving slots.
Inventors
- 👤 Edward A Boyd
- 👤 Joseph R Harkness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K1/00; H02K1/06; H02K1/22; H02K1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
An armature core comprising a stack of laminations assembled on a shaft, to form a laminated coil-carrying body the peripheral portion of which is defined by a circular row of T-shaped teeth, the heads of which are radially outermost so that said body has circumferentially spaced reentrant coil receiving slots formed by the spaces betWeen the teeth and opening to its periphery through the spaces between the heads of the T-shaped teeth, and said core being characterized in that the heads of the T-shaped teeth on a plurality of the endmost laminations at the axially opposite ends of said laminated body are progressively narrower towards the ends of the body.
Claim 2
Dependent Claim
110 words
An armature core comprising a stack of laminations assembled on a shaft, to form a laminated coil-carrying body the peripheral portion of which is defined by a circular row of T-shaped teeth, the heads of which are radially outermost so that said body has circumferentially spaced reentrant coil receiving slots formed by the spaces betWeen the teeth and opening to its periphery through the spaces between the heads of the T-shaped teeth, and said core being characterized in that the heads of the T-shaped teeth on a plurality of the endmost laminations at the axially opposite ends of said laminated body are progressively narrower towards the ends of the body.
Claim 3
Dependent Claim
26 words
The armature core of claim 1, further characterized by a preformed plastic shield abutting and covering each of the axially opposite ends of said laminated body.
Claim 4
Dependent Claim
120 words
The armature core of claim 2, wherein each of said preformed plastic shields is of substantially the same size and shape as the end of the laminated body which it covers, so that said shields have T-shaped tooth portions, and further characterized by protective flanges projecting from the edges of the tooth portions of said shields embracing the T-shaped teeth of the endmost laminations, the flange portions that embrace the heads of the T-shaped teeth of the endmost laminations being accommodated by said reduction in width of the heads of said T-shaped teeth on said laminations, whereby the presence of the protective flanges does not objectionably reduce the width of the entrances to the ends of the coil receiving slots.
Claim 5
Dependent Claim
64 words
The armature core of claim 3, further characterized in that said protective flanges along the edges of the tooth portions of the shields continue uninterruptedly across the bottom of the spaces between said tooth portions, and wherein the flange portions at the bottom of the spaces between the tooth portions overlie the adjacent bottom edges of the coil receiving slots in the laminated body.
Claim 6
Dependent Claim
60 words
The armature core of claim 1, further characterized in that on said plurality of the endmost laminations at the axially opposite ends of the laminated body, the heads of the T-shaped teeth have their extremities bent out of coplanar relationship with their respective laminations and away from the axially opposite ends of the laminated body and nested into one another.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |