Patent US4038859A successfully refreshed from Google Patents.
US4038859A
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US
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Metal forming die
Assignee: Primerica Inc
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Filing: 1976-07-14
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Granted: 1977-08-02
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Expires: 1996-07-14
Abstract
Abstract A metal forming die having a unique profile is provided for use in producing cylindrical articles of elongated sidewall configuration. Most notably, the die is applicable to the production of drawn and ironed can shells.
Inventors
- 👤 John Pavleszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:27
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/20; B21D22/28; B21D22/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A metal forming die adapted for coaction with a cylindrical punch, comprising a body having a uniform circular opening therein, said opening being defined by a generally cylindrical land surface, an inwardly tapered frustoconical entrance surface leading to said land surface, an inwardly tapered exit surface extending from said land surface, and circular transition surfaces at the junctures of said entrance and exit surfaces with said land surface, in cross-section said entrance and land surfaces being rectilinear and said transition surfaces being arcuate, whereby smooth transition is afforded from said entrance surface to said land surface and from said land surface to said exit surface.
Claim 2
Dependent Claim
105 words
A metal forming die adapted for coaction with a cylindrical punch, comprising a body having a uniform circular opening therein, said opening being defined by a generally cylindrical land surface, an inwardly tapered frustoconical entrance surface leading to said land surface, an inwardly tapered exit surface extending from said land surface, and circular transition surfaces at the junctures of said entrance and exit surfaces with said land surface, in cross-section said entrance and land surfaces being rectilinear and said transition surfaces being arcuate, whereby smooth transition is afforded from said entrance surface to said land surface and from said land surface to said exit surface.
Claim 3
Dependent Claim
21 words
The die of claim 1 wherein said entrance surface forms an angle of about 7° to 8° with said land surface.
Claim 4
Dependent Claim
26 words
The die of claim 2 wherein said exit surface is of rectilinear cross-section, and forms an angle of about 7° to 8° with said land surface.
Claim 5
Dependent Claim
22 words
The die of claim 1 wherein each of said transition surfaces has, in cross-section, a radius of about 0.005 to 0.050 inch.
Claim 6
Dependent Claim
14 words
The die of claim 4 wherein said radius is about 0.0015 to 0.0025 inch.
Claim 7
Dependent Claim
22 words
The die of claim 5 wherein the center of said radius between said land and entrance surfaces lies on the axis therebetween.
Claim 8
Dependent Claim
25 words
The die of claim 1 wherein said land surface is about 0.040 to 0.10 inch and tapers slightly toward the entrance side of said die.
Claim 9
Dependent Claim
24 words
The die of claim 7 wherein said land surface is relieved toward the exit side of said die by about 0.00002 to 0.00005 inch.
References Cited (Backward Citations)
US2412813A
Cited
US3765206A
Cited
DE1954365A1
Cited
US3685337A
Cited
US3893326A
Cited
US3930396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |