US3622928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer core with adjustable airgap
Assignee: Individual
•
Filing: 1970-06-29
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Granted: 1971-11-23
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Expires: 1990-06-29
Abstract
Abstract A transformer core made up of two sections separated by an airgap, the width of this gap being adjustable to minimize the overall transformer loss ratio. A pair of small runner tubes are affixed to one of the core sections, each tube being internally threaded to receive a screw journaled on the other core section. Rotation of these screws allows for precise adjustment of the width of the gap between the core sections to a point where maximum power transfer to an output circuit is obtained.
Inventors
- 👤 Harry P Lee
- 👤 Peter Billic
- 👤 Clifford B Alfors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
360 words
In an electrical transformer having a ferrite core designed in the form of two generally U-shaped members disposed in spacedapart confronting relationship so as to establish a pair of airgaps between the diametrically opposed legs of said members, the respective widths of such airgaps being adjustable to vary the overall transformer loss ratio and hence the input-to-output power transfer, each pair of diametrically opposed legs having axially aligned grooves formed therein, the improvement which comprises: a pair of internally threaded collars having outer dimensions compatible with the inner dimensions of said grooves; means for respectively securing said pair of collars within the grooves formed in the legs of one of said U-shaped members; a pair of rods respectively freely receivable in said pair of grooves and passing through said pair of collars, that portion of each rod passing through the groove in said one U-shaped member being threaded to engage the threaded inner surface of the collar through which it passes; a retainer plate secured to the other of said U-shaped members and lying in a plane normal to the axis of said grooves and of said pair of rods; said retainer plate having a pair of openings therein through which said pair of rods respectively pass; each of said pair of rods having both an interior shoulder contiguous with and bearing against one surface of said retainer plate as well as a transverse opening adjacent the other surface of said retainer plate; and a pair of pins respectively passing through the openings in said pair of rods and serving, with said shoulders, to preclude axial movement of said rods with respect to the other of said U-shaped members, whereby selective manual rotation of either rod of said pair will result in an axial movement with respect to the said other U-shaped member of the collar through which said selected rod passes, and hence of the core leg to which said collar is secured, the two said airgaps being thus individually adjustable in width to provide precise vernier control over the loss ratio of said transformer and hence the amount of power transferred from the input to the output thereof.
Claim 2
Dependent Claim
360 words
In an electrical transformer having a ferrite core designed in the form of two generally U-shaped members disposed in spacedapart confronting relationship so as to establish a pair of airgaps between the diametrically opposed legs of said members, the respective widths of such airgaps being adjustable to vary the overall transformer loss ratio and hence the input-to-output power transfer, each pair of diametrically opposed legs having axially aligned grooves formed therein, the improvement which comprises: a pair of internally threaded collars having outer dimensions compatible with the inner dimensions of said grooves; means for respectively securing said pair of collars within the grooves formed in the legs of one of said U-shaped members; a pair of rods respectively freely receivable in said pair of grooves and passing through said pair of collars, that portion of each rod passing through the groove in said one U-shaped member being threaded to engage the threaded inner surface of the collar through which it passes; a retainer plate secured to the other of said U-shaped members and lying in a plane normal to the axis of said grooves and of said pair of rods; said retainer plate having a pair of openings therein through which said pair of rods respectively pass; each of said pair of rods having both an interior shoulder contiguous with and bearing against one surface of said retainer plate as well as a transverse opening adjacent the other surface of said retainer plate; and a pair of pins respectively passing through the openings in said pair of rods and serving, with said shoulders, to preclude axial movement of said rods with respect to the other of said U-shaped members, whereby selective manual rotation of either rod of said pair will result in an axial movement with respect to the said other U-shaped member of the collar through which said selected rod passes, and hence of the core leg to which said collar is secured, the two said airgaps being thus individually adjustable in width to provide precise vernier control over the loss ratio of said transformer and hence the amount of power transferred from the input to the output thereof.
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |