US4715208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming end panels for containers
Assignee: Stolle Machinery Co LLC
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Filing: 1986-10-30
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Granted: 1987-12-29
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Expires: 2006-10-30
Abstract
Abstract A method of forming a container end panel having a countersink radius and a chuckwall including preforming the radius and the chuckwall so that the chuckwall includes a straight wall portion tangent to the radius and reforming and reducing the radius without tooling restraint while holding pressure against the straight wall area. Apparatus for performing the method includes a punch core and a cooperating die core ring having complimental geometry for forming the chuckwall and radius configuration. The article formed by the method and apparatus includes an end panel having a straight wall portion between the normal tapered wall portion and countersink radius.
Inventors
- 👤 Joseph D. Bulso, Jr.
- 👤 James A. McClung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:47
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A method of forming a container end piece from a blank of material comprising the steps of: (A) initially forming an end piece having a central panel and a peripheral flange interconnected by a countersink radius adjacent said central panel and a tapered chuckwall leading from said flange to said radiused area with said wall being tapered toward said central panel for a portion of its length and terminating in a vertical segment adjacent said radiused area; and (B) reforming the end piece initially formed to reduce the radius while maintaining at least a portion of said vertical segment in a vertical condition.
Claim 2
Independent Claim
103 words
A method of forming a container end piece from a blank of material comprising the steps of: (A) initially forming an end piece having a central panel and a peripheral flange interconnected by a countersink radius adjacent said central panel and a tapered chuckwall leading from said flange to said radiused area with said wall being tapered toward said central panel for a portion of its length and terminating in a vertical segment adjacent said radiused area; and (B) reforming the end piece initially formed to reduce the radius while maintaining at least a portion of said vertical segment in a vertical condition.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein said initial forming includes forming the radiused area with a punch having an annular nose with a radius greater than the reduced radius produced by the reforming step.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein holding pressure is maintained against at least a portion of said vertical segment of said wall during at least a portion of said reforming.
Claim 5
Dependent Claim
128 words
Apparatus for forming a container end piece from a blank of material comprising: (A) a base; (B) a die core carried by said base for movement relatively thereof; (C) a die core ring carried by said base in concentric relationship with said die core; (D) a punch core disposed in opposed relationship with and movable toward and away from said die core; (E) a first pressure sleeve disposed in opposed relationship with and movable toward and away from said die core ring; (F) said die core ring being radially spaced from said die core; and (G) said punch core having a projecting annular nose movable into the space between said die core and said die core ring to preliminarily form a radiused area in the blank of material.
Claim 6
Dependent Claim
128 words
Apparatus for forming a container end piece from a blank of material comprising: (A) a base; (B) a die core carried by said base for movement relatively thereof; (C) a die core ring carried by said base in concentric relationship with said die core; (D) a punch core disposed in opposed relationship with and movable toward and away from said die core; (E) a first pressure sleeve disposed in opposed relationship with and movable toward and away from said die core ring; (F) said die core ring being radially spaced from said die core; and (G) said punch core having a projecting annular nose movable into the space between said die core and said die core ring to preliminarily form a radiused area in the blank of material.
Claim 7
Dependent Claim
52 words
The apparatus of claim 4 wherein said die core ring has upper and lower ends; said punch core has a projecting lower end; and one wall surface of said upper end of said die core ring and the outer peripheral wall of said lower end of said punch core are complementally configured.
Claim 8
Dependent Claim
51 words
The apparatus of claim 5 wherein said one wall surface of said die core ring tapers downwardly and inwardly for a portion of its length and terminates in a straight wall portion; and said peripheral wall of said punch core tapers downwardly and inwardly and terminates in a straight wall portion.
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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) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |