US3792399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Banded transformer cores
Assignee: National Aeronautics and Space Administration
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Filing: 1972-08-28
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Granted: 1974-02-12
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Expires: 1992-08-28
Abstract
Abstract A banded transformer core formed by positioning a pair of mated, similar core halves on a supporting pedestal, encircling the core halves with a strap, selectively applying tension thereto, whereby a compressive force is applied about the periphery of the core for reducing the innate air gap between the core halves, and welding the strap at a cruciform joint. A d.c. magnetic field is employed in supporting the core halves during initial phases of the banding operation, while an a.c. magnetic field subsequently is employed for detecting dimension changes occurring in the air gaps as tension is applied to the strap.
Inventors
- 👤 Lyman C Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F27/00; H01F27/24; H01F27/26; H01F27/263; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/24; Y10S174/25
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A banded tranformer core comprising: A. a pair of similar core halves of a selected configuration disposed in coplanar relation with the ends thereof being abutted to form a core of a closed-loop configuration; B. an endless strap encircling said core and applying a compressive force of a predetermined magnitude to the periphery of the core, said strap having means defining along opposite edges thereof a pair of longitudinally spaced, outwardly directed notches disposed in mutually-received relation defining a cruciform joint; and C. means adjacent to said joint uniting said strap.
Claim 2
Dependent Claim
91 words
A banded tranformer core comprising: A. a pair of similar core halves of a selected configuration disposed in coplanar relation with the ends thereof being abutted to form a core of a closed-loop configuration; B. an endless strap encircling said core and applying a compressive force of a predetermined magnitude to the periphery of the core, said strap having means defining along opposite edges thereof a pair of longitudinally spaced, outwardly directed notches disposed in mutually-received relation defining a cruciform joint; and C. means adjacent to said joint uniting said strap.
Claim 3
Dependent Claim
16 words
The core of claim 1 wherein said means uniting said strap includes means defining a weld.
Claim 4
Dependent Claim
30 words
The core of claim 1 wherein each of said core halves includes an intermediate segment, and the intermediate segments of said pair of core halves are oriented in diametric opposition.
Claim 5
Dependent Claim
38 words
The core of claim 3 wherein each intermediate segment terminAtes in a pair of mutually spaced linear segments, whereby said core conforms to an oblong configuration having a pair of mutually spaced linear segments arranged in substantial parallelism.
Claim 6
Dependent Claim
39 words
The core of claim 3 wherein each intermediate segment is of an arcuate configuration and said core further comprises a spacer of an arcuate configuration interposed between said strap and the adjacent surface of each of said intermediate segments.
Claim 7
Dependent Claim
122 words
A banded transformer core of an oblong configuration comprising: A. a pair of mated core halves, each core half being shaped to conform to a U-shaped configuration having a pair of linear end segments arranged in substantial parallelism and an intermediate segment of an arcuate configuration joining said pair of end segments, each of said end segments including a substantially planar face disposed in an abutted contiguous engagement with an adjacent face of an end segment; and B. a continuous, tensioned strap encircling said core wherein said strap is united at a cruciform joint including means defining a pair of oppositely directed, mutually received openings formed in said strap, and a weld securing over-lapped portions of said strap, one to the other.
Claim 8
Dependent Claim
122 words
A banded transformer core of an oblong configuration comprising: A. a pair of mated core halves, each core half being shaped to conform to a U-shaped configuration having a pair of linear end segments arranged in substantial parallelism and an intermediate segment of an arcuate configuration joining said pair of end segments, each of said end segments including a substantially planar face disposed in an abutted contiguous engagement with an adjacent face of an end segment; and B. a continuous, tensioned strap encircling said core wherein said strap is united at a cruciform joint including means defining a pair of oppositely directed, mutually received openings formed in said strap, and a weld securing over-lapped portions of said strap, one to the other.
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |