US4527412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a necked container
Assignee: STOFFEL Tech Inc
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Filing: 1983-03-28
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Granted: 1985-07-09
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Expires: 2003-03-28
Abstract
Abstract A method and apparatus for making a necked container are disclosed wherein a sheet material is formed into a generally cylindrical tubular member and the adjacent longitudinally extending edges of the sheet are butt welded. The welded tubular member is progressively necked-in over a dome-shaped surface of a single mandrel provided within the welded tubular member. The free end of the necked end portion of the tubular member is trimmed and curled to form a necked container body.
Inventors
- 👤 Hans F. Stoffel
- 👤 William T. Saunders
- 👤 Anthony J. Sporri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:43
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/14; B65D83/38; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2623; B21D51/2638
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
198 words
A method of making a necked tubular member comprising the steps of forming a sheet of material into a generally cylindrical tubular member and welding the adjacent longitudinally extending edges of the sheet, arranging said welded tubular member about a mandrel having a free end portion with a dome-shaped surface, performing a plurality of necking-in operations on said welded tubular member while said member is arranged about said mandrel to progressively reduce the diameter of a free end portion of the tubular member at least 15% from the original diameter of said tubular member with the necked-in end of the tubular member having a dome-shaped configuration, said plurality of necking-in operations including a first necking-in operation of reducing the diameter of the free end portion of the tubular member and forming an intermediate portion between said reduced diameter free end portion and the remainder of the tubular member over a portion of said dome-shaped surface of said mandrel and a further necking-in operation of further reducing the diameter of the free end portion of the tubular member and further forming said intermediate portion over said dome-shaped surface of said mandrel to increase the extent of said intermediate portion.
Claim 2
Independent Claim
198 words
A method of making a necked tubular member comprising the steps of forming a sheet of material into a generally cylindrical tubular member and welding the adjacent longitudinally extending edges of the sheet, arranging said welded tubular member about a mandrel having a free end portion with a dome-shaped surface, performing a plurality of necking-in operations on said welded tubular member while said member is arranged about said mandrel to progressively reduce the diameter of a free end portion of the tubular member at least 15% from the original diameter of said tubular member with the necked-in end of the tubular member having a dome-shaped configuration, said plurality of necking-in operations including a first necking-in operation of reducing the diameter of the free end portion of the tubular member and forming an intermediate portion between said reduced diameter free end portion and the remainder of the tubular member over a portion of said dome-shaped surface of said mandrel and a further necking-in operation of further reducing the diameter of the free end portion of the tubular member and further forming said intermediate portion over said dome-shaped surface of said mandrel to increase the extent of said intermediate portion.
Claim 3
Dependent Claim
35 words
A method according to claim 1, wherein the diameter of said free end portion is reduced on the order of one-half of the original diameter of said tubular member by said plurality of necking-in operations.
Claim 4
Dependent Claim
13 words
A method according to claim 1, wherein said sheet of material is steel.
Claim 5
Dependent Claim
24 words
A method according to claim 1, including the additional step of trimming the reduced free end portion of said tubular member and curling it.
Claim 6
Dependent Claim
43 words
A method according to claim 4, wherein the free end portion of said tubular member is curled by first beading the free end portion inwardly and then curling it inwardly on itself so that the trimmed edge thereof is tucked inside the curl.
Claim 7
Dependent Claim
35 words
A method according to claim 1, wherein the diameter of the free end portion of said tubular member is reduced approximately 8% in said first necking-in operation and approximately 3% in said further necking-in operation.
Claim 8
Independent Claim
174 words
A method of necking-in a tubular member comprising the steps of providing a tubular member about a mandrel having a free end portion with a dome-shaped surface, performing a plurality of necking-in operations on said tubular member while said member is arranged about said mandrel to progressively reduce the diameter of a free end portion of the tubular member at least 15% from the original diameter of said tubular member with the necked-in end of the tubular member having a dome-shaped configuration, said plurality of necking-in operations including a first necking-in operation of reducing the diameter of the free end portion of the tubular member and forming an intermediate portion between said reduced diameter free end portion and the remainder of the tubular member over a portion of said dome-shaped surface of said mandrel and a further necking-in operation of further reducing the diameter of the free end portion of the tubular member and further forming said intermediate portion over said dome-shaped surface of said mandrel to increase the extend of said intermediate portion.
Claim 9
Independent Claim
174 words
A method of necking-in a tubular member comprising the steps of providing a tubular member about a mandrel having a free end portion with a dome-shaped surface, performing a plurality of necking-in operations on said tubular member while said member is arranged about said mandrel to progressively reduce the diameter of a free end portion of the tubular member at least 15% from the original diameter of said tubular member with the necked-in end of the tubular member having a dome-shaped configuration, said plurality of necking-in operations including a first necking-in operation of reducing the diameter of the free end portion of the tubular member and forming an intermediate portion between said reduced diameter free end portion and the remainder of the tubular member over a portion of said dome-shaped surface of said mandrel and a further necking-in operation of further reducing the diameter of the free end portion of the tubular member and further forming said intermediate portion over said dome-shaped surface of said mandrel to increase the extend of said intermediate portion.
Claim 10
Dependent Claim
34 words
A method according to claim 7, wherein said further necking-in operation is repeated until the diameter of the free end is on the order of one-half of the original diameter of said tubular member.
Claim 11
Dependent Claim
24 words
A method according to claim 7, including the additional step of trimming the reduced free end portion of said tubular member and curling it.
Claim 12
Dependent Claim
43 words
A method according to claim 9, wherein the free end portion of said tubular member is curled by first beading the free end portion inwardly and then curling it inwardly on itself so that the trimmed edge thereof is tucked inside the curl.
Claim 13
Dependent Claim
16 words
A method according to claim 7, wherein said tubular member is a welded steel tubular member.
Claim 14
Dependent Claim
35 words
A method according to claim 11, wherein the diameter of the free end portion of said tubular member is reduced approximately 8% in said first necking-in operation and approximately 3% in said further necking-in operation.
Claim 15
Dependent Claim
40 words
A method according to claim 1, including the step of providing a plurality of pairs of cooperating inside and outside tools, respective pairs of said tools being used in cooperation with said mandrel to effect said plurality of necking-in operation.
Claim 16
Dependent Claim
40 words
A method according to claim 7, including the step of providing a plurality of pairs of cooperating inside and outside tools, respective pairs of said tools being used in cooperation with said mandrel to effect said plurality of necking-in operations.
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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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |