US5075150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pack of laminations with projections and depressions in torsionally flexible contact
Assignee: Linton and Hirst Ltd
•
Filing: 1990-10-31
•
Granted: 1991-12-24
•
Expires: 2010-10-31
Abstract
Abstract In one embodiment, the pack is torsionally flexible. Pack of laminations comprises laminations which are connected one to another by only a single connection. The single connection is provided by a projection which projects into a depression. The projection has a height which is greater than 50% of the thickness of the lamination and the depression has a depth which is greater than 50% of the thickness of the lamination. The depression and projection are produced by a projection punch which cooperates with a die. The die has a lip which is either radiused (r) or conical (C) and the punch causes the metal of the lamination to be extruded past the lip into the die while the depression is being formed. The radiused or conical lip allows the height of the projection and the depth of the depression to be greater than the normal 50% shear stress fracture depth/height.
Inventors
- 👤 Charles H. Webb
- 👤 William G. French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:19
CPC Classifications
B; B21; B21D; B21D35/00; H; H01; H01F; H01F27/00; H01F27/24; H01F27/245; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12264; Y10T428/12347; Y10T428/12361; Y10T428/12368; Y10T428/12493; Y10T428/12639; Y10T428/21; Y10T428/24; Y10T428/24008; Y10T428/24017; Y10T428/24273; Y10T428/24281; Y10T428/24289; Y10T428/24479; Y10T428/24521; Y10T428/24529; Y10T428/24545; Y10T428/24612; Y10T428/24628; Y10T428/24669; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249923; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A stack of laminations for use magnetic core plates in an electromagnetic device, each lamination being of a non-circular configuration, being located in a plane and comprising, on a common axis perpendicular to the lamination, a single depression in one side and a single projection on the other side thereof, each lamination being coupled to an adjacent lamination only by the single projection projecting into the single depression of the adjacent lamination, the depression and projection in each lamination being circular and the depressions and projections interfitting, with a circular circumference of the projection being in coupling, torsionally flexible contact with a circular circumference of the depression which permits twisting of the laminations with respect to each other about an axis perpendicular to the plane of each lamination, while retaining substantially the same coupling fit between adjacent laminations in order to retain the laminations assembled together in the pack, so that the stack is torsionally flexible.
Claim 2
Dependent Claim
156 words
A stack of laminations for use magnetic core plates in an electromagnetic device, each lamination being of a non-circular configuration, being located in a plane and comprising, on a common axis perpendicular to the lamination, a single depression in one side and a single projection on the other side thereof, each lamination being coupled to an adjacent lamination only by the single projection projecting into the single depression of the adjacent lamination, the depression and projection in each lamination being circular and the depressions and projections interfitting, with a circular circumference of the projection being in coupling, torsionally flexible contact with a circular circumference of the depression which permits twisting of the laminations with respect to each other about an axis perpendicular to the plane of each lamination, while retaining substantially the same coupling fit between adjacent laminations in order to retain the laminations assembled together in the pack, so that the stack is torsionally flexible.
Claim 3
Dependent Claim
50 words
A stack according to claim 1, wherein the projection has a base which is radiussed, the depth of the depression is greater than 50% of the lamination thickness, and the height of the projection is greater than 50% of the lamination thickness but less than the depth of the depression.
Claim 4
Dependent Claim
30 words
A stack according to claim 1, wherein the depth of the depression is about 69% of the lamination thickness and the projection height is about 65% of the lamination thickness
Claim 5
Dependent Claim
15 words
A stack according to claim 1, wherein the depression has a lip which is radiussed.
Claim 6
Dependent Claim
56 words
A stack according to claim 1, wherein the projection has a base which is in the shape of a truncated cone, the depth of the depression is greater than 50% of the lamination thickness, and the height of the projection is greater than 50% of the lamination thickness but less than the depth of the depression.
Claim 7
Dependent Claim
15 words
A stack according to claim 5, wherein the depression has a lip which is radiussed.
Claim 8
Dependent Claim
13 words
A stack of laminations according to claim 1, additionally including a partitioning plate.
References Cited (Backward Citations)
US2588727A
Cited
US2545528A
Cited
US2671951A
Cited
US2975312A
Cited
GB857915A
Cited
US3203077A
Cited
US3202851A
Cited
US4149136A
Cited
US4110895A
Cited
US4160182A
Cited
US4264663A
Cited
US4364169A
Cited
US4538345A
Cited
US4728842A
Cited
US4827237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |