US3909761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformers
Assignee: Miles Platts Ltd
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Filing: 1974-05-21
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Granted: 1975-09-30
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Expires: 1994-05-21
Abstract
Abstract The invention relates to transformer bobbins which are moulded from plastics material. The moulding provides spool portions for the primary and secondary windings of the transformer which are separated by a radially extending flange. A shroud is provided in the form of a casing which at least partially encloses the windings and has an internally formed ridge which engages the edge of the flange in an interleaving manner to minimise the ''tracking'' of current between the windings.
Inventors
- 👤 Terence Neville Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/324; H01F27/325; H01F5/00; H01F5/02; H01F2005/022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A transformer bobbin assembly comprising: a one-piece body member formed by two axially arranged spool members having an open central portion for receiving a core of metal material and at least one radially extending intermediate first flange means dividing said body into two portions, the periphery of said first flange means forming a first interengaging portion, a second flange at each end of said body member defining a winding area between each said second flange and said first flange means, a shroud means mounted transverse of the axis of the body member enclosing the winding areas of said body member over at least a portion of the peripheries thereof, said shroud means having a portion projecting inwardly forming a second interengaging means cooperating with said first interengaging means, at least one of said interengaging means comprising a multiple lip and the other of said engaging means interleaving with said multiple lip.
Claim 2
Dependent Claim
151 words
A transformer bobbin assembly comprising: a one-piece body member formed by two axially arranged spool members having an open central portion for receiving a core of metal material and at least one radially extending intermediate first flange means dividing said body into two portions, the periphery of said first flange means forming a first interengaging portion, a second flange at each end of said body member defining a winding area between each said second flange and said first flange means, a shroud means mounted transverse of the axis of the body member enclosing the winding areas of said body member over at least a portion of the peripheries thereof, said shroud means having a portion projecting inwardly forming a second interengaging means cooperating with said first interengaging means, at least one of said interengaging means comprising a multiple lip and the other of said engaging means interleaving with said multiple lip.
Claim 3
Dependent Claim
39 words
A transformer bobbin assembly as in claim 1 wherein saiD first interengaging means comprises a double lip having a recess and said second interengaging means of said shroud means has a portion which fits within said double lip recess.
Claim 4
Dependent Claim
33 words
A transformer assembly as in claim 1 wherein each said second flange of said body member includes third interengaging means and said shroud means includes flange members for engaging said third interengaging means.
Claim 5
Dependent Claim
35 words
A transformer assembly as in claim 1 further comprising one set of electrical terminal means on one of said second flanges and two sets of electrical terminal means on the other of said second flanges.
Claim 6
Dependent Claim
25 words
A transformer assembly as in claim 1 wherein said shroud means extends completely across the winding areas between said second flanges and said intermediate flange.
Claim 7
Dependent Claim
25 words
A transformer assembly as in claim 3 wherein said shroud means extends completely across the winding areas between said second flanges and said intermediate flange.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |