US4149136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core lamination for shell-type cores, preferably for transformers
Assignee: Individual
•
Filing: 1977-10-05
•
Granted: 1979-04-10
•
Expires: 1997-10-05
Abstract
Abstract The invention concerns a transformer lamination having a center leg, two outer legs and two yokes connecting these legs and having at least one joint between one side of the center leg and the adjacent yoke. Characteristic features are that the length of the joint at each side of the center axis is at least 0.75 times the center leg width and that the joint has at least one concave part and at least one convex part on at least one side of the center axis. A preferred embodiment contains two symmetrical joints, each of them comprising two sections which are parallel to the center axis and one section which is perpendicular to the center axis.
Inventors
- 👤 Karl Philberth
- 👤 Bernhard Philberth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:37
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
199 words
Core laminations for shell-type cores, comprising said laminations alternately interleaved, each of said core laminations being of one-piece construction and having a center leg, two outer legs parallel thereto at a certain distance, and two yokes connecting the ends of said legs, at least one joint being provided between one side of the center leg and the adjacent yoke being called a parted yoke for interleaving with a winding and the other yoke having no joints with the center leg and the two outer legs, wherein the sum of the width (c 1 ) of the jointlessly connecting yoke and the width (c 2 ) of the parted yoke is at least 1.25 times and maximum 1.45 times the center leg width (f), wherein the length of the joint at each side of the center axis is at least 0.75 times the center leg width (f) and wherein the joint has at least one concave part and at least one convex part on at least one side of the center axis, relative to said center axis, said alternate interleaving being realized by the joints of the parted yokes being overlapped by the jointlessly connecting yokes of the adjacent laminations.
Claim 2
Dependent Claim
199 words
Core laminations for shell-type cores, comprising said laminations alternately interleaved, each of said core laminations being of one-piece construction and having a center leg, two outer legs parallel thereto at a certain distance, and two yokes connecting the ends of said legs, at least one joint being provided between one side of the center leg and the adjacent yoke being called a parted yoke for interleaving with a winding and the other yoke having no joints with the center leg and the two outer legs, wherein the sum of the width (c 1 ) of the jointlessly connecting yoke and the width (c 2 ) of the parted yoke is at least 1.25 times and maximum 1.45 times the center leg width (f), wherein the length of the joint at each side of the center axis is at least 0.75 times the center leg width (f) and wherein the joint has at least one concave part and at least one convex part on at least one side of the center axis, relative to said center axis, said alternate interleaving being realized by the joints of the parted yokes being overlapped by the jointlessly connecting yokes of the adjacent laminations.
Claim 3
Dependent Claim
29 words
Core laminations as defined in claim 1, wherein the width of the jointlessly connecting yoke is greater than that of the parted yoke (c 1 > c 2 ).
Claim 4
Dependent Claim
29 words
Core laminations as defined in claim 1, wherein the width of the jointlessly connecting yoke is equal to that of the parted yoke (c 1 = c 2 ).
Claim 5
Dependent Claim
38 words
Core laminations as defined in claim 1, wherein a joint part which is concave relative to the center axis is followed by a convex joint part at a larger distance along the joint from the accompanying window corner.
Claim 6
Dependent Claim
46 words
Core laminations as defined in claim 1, wherein the sum of the width (c 1 ) of the jointlessly connecting yoke and of the width (c 2 ) of the parted yoke is at least 1.3 times and maximum 1.4 times the center leg width (f).
Claim 7
Dependent Claim
61 words
Core laminations as defined in claim 1, wherein the sum of the width (c 1 ) of the jointlessly connecting yoke and of the width (c 2 ) of the parted yoke is approximately 1.35 times the center leg width (f) and wherein the sum of the two outer leg widths (b) is approximately 1.25 times the center leg width (f).
Claim 8
Dependent Claim
16 words
Core laminations as defined in claim 1, wherein each joint is designed as a hairline gap.
Claim 9
Dependent Claim
38 words
Core laminations as defined in claim 1, wherein the total joint length is equal at least to the length of both diagonals running from the inner core lamination window corner to the center of the outer yoke edge.
Claim 10
Dependent Claim
47 words
Core laminations as defined in claim 1, wherein the total joint length is approximately equal to twice the center leg width (f), minus twice the difference (c 1 - c 2 ) between the width of the jointlessly connecting yoke and the width of the parted yoke.
Claim 11
Dependent Claim
17 words
Core laminations as defined in claim 1, wherein the joints are asymmetrical relative to the center axis.
Claim 12
Dependent Claim
17 words
Core laminations as defined in claim 1, wherein the joints are symmetrical relative to the center axis.
Claim 13
Dependent Claim
53 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis no part of the joint is much more than one fifth of the center leg width (f) away from the diagonal connecting the accompanying core lamination window corner to the center of the outer yoke edge.
Claim 14
Dependent Claim
40 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the joint intersects at least twice the diagonal connecting the accompanying core lamination window corner to the center of the outer yoke edge.
Claim 15
Dependent Claim
32 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the joint extends a little as a linear continuation of the longitudinal center leg edge.
Claim 16
Dependent Claim
28 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the joint contains two sections approximately parallel to the center axis.
Claim 17
Dependent Claim
37 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the joint contains a section which does not intersect the center axis and is approximately perpendicular to said center axis.
Claim 18
Dependent Claim
35 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the joint is shaped substantially like a staircase with a least one and a maximum of two steps.
Claim 19
Dependent Claim
57 words
Core laminations as defined in claim 1, wherein provision is made for two joints not intersecting the center axis, each of which joints ends at a point on the outer yoke edge which is situated further away from the imaginary linear continuation of the longitudinal center leg edge on the same side than from the center axis.
Claim 20
Dependent Claim
37 words
Core laminations as defined in claim 1, wherein provision is made for a joint not reaching the outer yoke edge, which joint starts at the window corners at a slanting angle to the longitudinal center leg edge.
Claim 21
Dependent Claim
92 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the middle of the joint part that is convex relative to the center axis is located in such a way that the distance at which it is situated from the linear prolongation of the accompanying longitudinal center leg edge is approximately half as large as the sum formed by the joint length between said middle and the accompanying inner core lamination window corner and by the yoke width difference (c 1 - c 2 ).
Claim 22
Dependent Claim
60 words
Core laminations as defined in claim 1, wherein on at least one side of the center axis the middle of each concave part is located in such a way that its distance from the outer yoke edge is approximately 0.55 to 0.65 times as large as the joint length between said middle and the outer yoke edge or center axis.
Claim 23
Dependent Claim
46 words
Core laminations as defined in claim 2, wherein the sum of the width (c 1 ) of the jointlessly connecting yoke and of the width (c 2 ) of the parted yoke is at least 1.3 times and maximum 1.4 times the center leg width (f).
Claim 24
Dependent Claim
61 words
Core laminations as defined in claim 2, wherein the sum of the width (c 1 ) of the jointlessly connecting yoke and of the width (c 2 ) of the parted yoke is approximately 1.35 times the center leg width (f) and wherein the sum of the two outer leg widths (b) is approximately 1.25 times the center leg width (f).
Claim 25
Dependent Claim
16 words
Core laminations as defined in claim 2, wherein each joint is designed as a hairline gap.
Claim 26
Dependent Claim
16 words
Core laminations as defined in claim 6, wherein each joint is designed as a hairline gap.
References Cited (Backward Citations)
BE510758A
Cited
US1385624A
Cited
CA794016A
Cited
FR67594E
Cited
DE1152204B
Cited
US3270307A
Cited
US3546571A
Cited
US3631534A
Cited
DE2454419A1
Cited
DE2541815A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |