Patent US5349740A successfully refreshed from Google Patents.
US5349740A
Expired / Lapsed
US
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Method and progressive die assembly with separate blanking and stacking for the manufacture of laminated parts
Assignee: LH Carbide Corp
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Filing: 1993-04-05
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Granted: 1994-09-27
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Expires: 2013-04-05
Abstract
Abstract Elongated thin strip stock is blanked to form interlocking laminas for electric motor or generator rotors or stators at successive blanking stations. The laminas are blanked at one station and pushed back into the strip stock to be carried to a final station where the laminas are stacked and pressed into interlocking relationship. The laminas are rotated relative to one another to compensate for thickness variations.
Inventors
- 👤 Thomas R. Neuenschwander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:48
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/22; H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K2201/00; H02K2201/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/51; Y10T29/5197; Y10T29/53; Y10T29/5313; Y10T29/5317; Y10T29/53187; Y10T83/00; Y10T83/04; Y10T83/0448; Y10T83/0457
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
99 words
A progressive die assembly for manufacturing electromagnetic cores from sheet stock material, said progressive die assembly comprising: a punching station including means for blanking laminas out of a generally planar sheet of stock material, said punching station further including means for returning the laminas to the plane generally defined by the sheet stock material; and a stacking station separate from said punching station, said stacking station including holding means for frictionally holding a first lamina and inserting means for inserting a second lamina into said holding means, said inserting means also interlocking the second lamina with said first lamina.
Claim 2
Dependent Claim
99 words
A progressive die assembly for manufacturing electromagnetic cores from sheet stock material, said progressive die assembly comprising: a punching station including means for blanking laminas out of a generally planar sheet of stock material, said punching station further including means for returning the laminas to the plane generally defined by the sheet stock material; and a stacking station separate from said punching station, said stacking station including holding means for frictionally holding a first lamina and inserting means for inserting a second lamina into said holding means, said inserting means also interlocking the second lamina with said first lamina.
Claim 3
Dependent Claim
48 words
The progressive die assembly of claim 1 further comprising stamping means for stamping a slug out of a lamina, said stamping means being located at said punching station, and said blanking means includes a cylindrical punch having an opening in communication with a chute for removing said slug.
Claim 4
Dependent Claim
36 words
The progressive die assembly of claim 1 wherein said blanking means includes a cylindrical die ring for blanking a lamina, and said returning means includes a cylindrical push back ring slidably positioned in said die ring.
Claim 5
Dependent Claim
28 words
The progressive die assembly of claim 3 wherein said push back ring includes a flange for limiting the movement of said push back ring in said die ring.
Claim 6
Dependent Claim
22 words
The progressive die assembly of claim 3 wherein said returning means further includes compression spring means for biasing said push back ring.
Claim 7
Dependent Claim
18 words
The progressive die assembly of claim 5 further comprising second spring means for biasing said push back ring.
Claim 8
Dependent Claim
47 words
The progressive die assembly of claim 6 further comprising a plate assembly disposed on said compression spring means, said plate assembly including a plate and a bolt extending through said plate and attached to said push back ring, said bolt also extending through said second spring means.
Claim 9
Dependent Claim
22 words
The progressive die assembly of claim 1 wherein said holding means includes a collar having a shape adapted to receive said laminas.
Claim 10
Dependent Claim
22 words
The progressive die assembly of claim 8 wherein said collar includes a choke ring portion dimensioned for frictional engagement with said laminas.
Claim 11
Dependent Claim
32 words
The progressive die assembly of claim 9 wherein said choke ring maintains a uniform back pressure on said first lamina when said inserting means inserts said second lamina into said holding means.
Claim 12
Dependent Claim
12 words
The progressive die assembly of claim 8 wherein said collar is rotatable.
Claim 13
Dependent Claim
31 words
The progressive die assembly of claim 11 further comprising a die shoe supporting said collar, said collar including a plurality of bearings disposed in a tapered relationship within said die shoe.
Claim 14
Dependent Claim
27 words
The progressive die assembly of claim 1 further comprising means for advancing the sheet-stock material and said blanked laminas from said punching station to said stacking station.
Claim 15
Independent Claim
110 words
A method of manufacturing laminas from sheet stock material to produce electromagnetic cores using a progressive die assembly having a device for holding the laminas, said method comprising the steps of: blanking the lamina by punching the lamina out of the plane generally defined by said sheet stock material, and returning the lamina to the plane generally defined by said sheet stock material; inserting the lamina into an interference fit with a holding device; blanking a second lamina out of the sheet stock material, and returning the second lamina to the sheet stock material; and inserting the second lamina into the holding device and interlocking the first and second laminas.
Claim 16
Independent Claim
110 words
A method of manufacturing laminas from sheet stock material to produce electromagnetic cores using a progressive die assembly having a device for holding the laminas, said method comprising the steps of: blanking the lamina by punching the lamina out of the plane generally defined by said sheet stock material, and returning the lamina to the plane generally defined by said sheet stock material; inserting the lamina into an interference fit with a holding device; blanking a second lamina out of the sheet stock material, and returning the second lamina to the sheet stock material; and inserting the second lamina into the holding device and interlocking the first and second laminas.
Claim 17
Dependent Claim
117 words
A progressive die assembly for manufacturing electromagnetic cores from sheet stock material, said progressive die assembly comprising: a lancing station including means for forming interlock tabs in the laminas; a punching station including means for blanking laminas out of a generally planar sheet of stock material, said punching station further including means for returning the laminas to the plane generally defined by the sheet stock material; and a stacking station separate from said punching station, said stacking station including holding means for frictionally holding a first lamina and inserting means for inserting a second lamina into said holding means and thereby interlock said interlock tabs of said second lamina with said interlock tabs of said first lamina.
Claim 18
Dependent Claim
117 words
A progressive die assembly for manufacturing electromagnetic cores from sheet stock material, said progressive die assembly comprising: a lancing station including means for forming interlock tabs in the laminas; a punching station including means for blanking laminas out of a generally planar sheet of stock material, said punching station further including means for returning the laminas to the plane generally defined by the sheet stock material; and a stacking station separate from said punching station, said stacking station including holding means for frictionally holding a first lamina and inserting means for inserting a second lamina into said holding means and thereby interlock said interlock tabs of said second lamina with said interlock tabs of said first lamina.
Claim 19
Dependent Claim
46 words
The progressive die assembly of claim 15 wherein said interlock forming means includes a beveled pin and a spring loaded supporting pin disposed adjacent to said beveled pin to prevent tab inclination and to limit the depression of the interlock tabs to about one lamina thickness.
Claim 20
Dependent Claim
47 words
The progressive die assembly of claim 15 further comprising stamping means for stamping a slug out of a lamina, said stamping means located at said punching station, and said blanking means includes a cylindrical punch having an opening in communication with a chute for removing said slug.
Claim 21
Dependent Claim
36 words
The progressive die assembly of claim 15 wherein said blanking means includes a cylindrical die ring for blanking a lamina, and said returning means includes a cylindrical push back ring slidably positioned in said die ring.
Claim 22
Dependent Claim
28 words
The progressive die assembly of claim 18 wherein said push back ring includes a flange for limiting the movement of said push back ring in said die ring.
Claim 23
Dependent Claim
22 words
The progressive die assembly of claim 18 wherein said returning means further includes compression spring means for biasing said push back ring.
Claim 24
Dependent Claim
18 words
The progressive die assembly of claim 20 further comprising second spring means for biasing said push back ring.
Claim 25
Dependent Claim
47 words
The progressive die assembly of claim 21 further comprising a plate assembly disposed on said compression spring means, said plate assembly including a plate and a bolt extending through said plate and attached to said push back ring, said bolt also extending through said second spring means.
Claim 26
Dependent Claim
22 words
The progressive die assembly of claim 15 wherein said holding means includes a collar having a shape adapted to receive said laminas.
Claim 27
Dependent Claim
22 words
The progressive die assembly of claim 23 wherein said collar includes a choke ring portion dimensioned for frictional engagement with said laminas.
Claim 28
Dependent Claim
32 words
The progressive die assembly of claim 24 wherein said choke ring maintains a uniform back pressure on said first lamina when said inserting means interlocks said second lamina with said first lamina.
Claim 29
Dependent Claim
12 words
The progressive die assembly of claim 23 wherein said collar is rotatable.
Claim 30
Dependent Claim
31 words
The progressive die assembly of claim 26 further comprising a die shoe supporting said collar, said collar including a plurality of bearings disposed in a tapered relationship within said die shoe.
Claim 31
Dependent Claim
27 words
The progressive die assembly of claim 15 further comprising means for advancing the sheet stock material and said laminas from said punching station to said stacking station.
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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) | 1997-09-26 | 1998-03-28 | 1998-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-26 | 2002-03-28 | 2002-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-26 | 2006-03-28 | 2006-09-27 | $7700.00 | Window Closed / Lapsed |