US4206435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer cover
Assignee: Nortel Networks Ltd
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Filing: 1978-10-02
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Granted: 1980-06-03
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Expires: 1998-10-02
Abstract
Abstract A shield for protecting transformer wire has a cap which fits over and locates the shield relative to the transformer laminations, a side wall to protectively cover transformer wire wound on a bobbin and an integral flange to protectively cover transformer input and output wire. A deflectable locking piece integral with the side wall is locatable under a flange of the bobbin to lock the shield in place.
Inventors
- 👤 John O. Harris
- 👤 Kai Leung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:55
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
A transformer and shield assembly comprising a transformer mounted on a baseboard, the transformer including coils wound on a bobbin, the bobbin having a central former extending between first and second bobbin flanges, electrical input and output wires of said coils passing adjacent said first bobbin flange, and a shield of one-piece construction having a cap, at least one wall depending from a part at least of the cap perimeter, a protective flange projecting outwardly from a distal edge of said wall, and fixture means for demountably mounting the shield at the second bobbin flange, the fixture means including a part spring deflectable from a position seated under said second flange thereby to demount the shield wherein, with said shield mounted, said wall at least partially covers transformer coil wire on said former, said protective flange at least partially covers the transformer coil input and output wire, and the part of the baseboard surrounding the transformer and shield assembly remains exposed.
Claim 2
Dependent Claim
161 words
A transformer and shield assembly comprising a transformer mounted on a baseboard, the transformer including coils wound on a bobbin, the bobbin having a central former extending between first and second bobbin flanges, electrical input and output wires of said coils passing adjacent said first bobbin flange, and a shield of one-piece construction having a cap, at least one wall depending from a part at least of the cap perimeter, a protective flange projecting outwardly from a distal edge of said wall, and fixture means for demountably mounting the shield at the second bobbin flange, the fixture means including a part spring deflectable from a position seated under said second flange thereby to demount the shield wherein, with said shield mounted, said wall at least partially covers transformer coil wire on said former, said protective flange at least partially covers the transformer coil input and output wire, and the part of the baseboard surrounding the transformer and shield assembly remains exposed.
Claim 3
Dependent Claim
17 words
An assembly as claimed in claim 1, wherein the bobbin flanges and former are both substantially rectangular.
Claim 4
Dependent Claim
29 words
An assembly as claimed in claim 2, wherein two such walls depending from the cap are in opposed disposition and at least partially cover opposite sides of the bobbin.
Claim 5
Dependent Claim
38 words
An assembly as claimed in claim 3, wherein the transformer includes a stack of laminations extending adjacent an outer surface of the second bobbin flange and said cap has a surface configured to fit closely around said laminations.
Claim 6
Dependent Claim
48 words
An assembly as claimed in claim 4, wherein said fixture means comprises a columnar projection extending from said protective flange said projection being spring deflectable from a position in which a free end of the columnar formation is seated under said second flange thereby to demount the shield.
Claim 7
Dependent Claim
18 words
An assembly as claimed in claim 5, wherein said free end is formed within an inwardly projecting lug.
Claim 8
Dependent Claim
12 words
an assembly as claimed in claim 6, wherein the lug is ramp-shaped.
Claim 9
Dependent Claim
15 words
An assembly as claimed in claim 1, wherein the shield is moulded in ABS plastic.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |