US4782254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-current dynamo electric machine, and method of manufacture
Assignee: Robert Bosch GmbH
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Filing: 1987-01-16
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Granted: 1988-11-01
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Expires: 2007-01-16
Abstract
Abstract The commutating poles of vehicular-type d-c motors, for example for trolley buses or trolley cars, are made by winding, on edge, a copper strip, permitting the wound copper strip to resiliently, spring-like expand so that the individual spiral loops thereof will be slightly spaced from each other, and then exposing the copper strip in a fluidized bed to an insulating powder, for example polyethylene or polyurethane, which is subsequently cured in a hardening or sintering process.
Inventors
- 👤 Helmut Kreuzer
- 👤 Klaus-Peter Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:41
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D1/00; B05D1/32; B05D1/322; H; H02; H02K; H02K15/00; H02K15/12; H02K23/00; H02K23/02; H02K23/24; B05D1/18; B05D1/22; B05D1/24; B05D2401/00; B05D2401/30; B05D2401/32; B05D7/20; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
Direct-current dynamo electric machine, particularly vehicular-type motor, having at least two commutating poles (4) and a commutating pole winding (5) on each one of the commutating poles, wherein each commutating pole (4) is made by the steps of winding a strip of conductive material (6), having essentially rectangular cross-sectional configuration, on edge, permitting the thus-formed edge-wound winding to resiliently expand to form a spiral winding loop having major surfaces facing one another, exposing said expanded spaced spiral winding loops to a fluidized bed in which a powder, comprising a curable, hardenable insulating material, is suspended, said powder precipitating in the fluidized bed on said expanded winding loops, hardening and curing said powder to form a uniform coalesced insulating coating on the conductive material (6) forming the commutating pole winding, and mounting the thus-insulated edge-wound winding on a commutating pole core (4).
Claim 2
Dependent Claim
141 words
Direct-current dynamo electric machine, particularly vehicular-type motor, having at least two commutating poles (4) and a commutating pole winding (5) on each one of the commutating poles, wherein each commutating pole (4) is made by the steps of winding a strip of conductive material (6), having essentially rectangular cross-sectional configuration, on edge, permitting the thus-formed edge-wound winding to resiliently expand to form a spiral winding loop having major surfaces facing one another, exposing said expanded spaced spiral winding loops to a fluidized bed in which a powder, comprising a curable, hardenable insulating material, is suspended, said powder precipitating in the fluidized bed on said expanded winding loops, hardening and curing said powder to form a uniform coalesced insulating coating on the conductive material (6) forming the commutating pole winding, and mounting the thus-insulated edge-wound winding on a commutating pole core (4).
Claim 3
Dependent Claim
28 words
Machine according to claim 1, wherein the conductive strip comprises copper; and the powder comprises at least one of the materials of the group consisting of: polyethylene; polyurethane.
Claim 4
Dependent Claim
29 words
Machine according to claim 1, wherein said powder precipitated in the fluidized bed on the winding strip of conductor (6) is hardened or cured by sintering on the conductor.
Claim 5
Dependent Claim
85 words
Machine according to claim 1, wherein each commutating pole is produced with terminal ends which are free from the coalesced insulating coating by the additional steps of prior to said step of exposing said winding to said fluidized bed, covering ends of said conductive strip (6) with a material which does not coalesce with the conductive strip (6) and, subsequent to said exposing and hardening steps, removing said non-coalescing material, and any powder coating thereon, from the conductive strip (6) to form coating-free terminal ends.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |