Patent US3581542A successfully refreshed from Google Patents.
US3581542A
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Apparatus for and method of necking in end portions of tubular members
Assignee: Continental Can Co Inc
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Filing: 1969-02-03
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Granted: 1971-06-01
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Expires: 1989-02-03
Abstract
Abstract This disclosure relates to apparatus for and method of necking in one or both end portions of tubular members. The disclosure particularly pertains to the necking in of tubular members which have internal surfaces which may be readily scratched by relative movement between the tubular member and the die center. Accordingly, a suitable die assembly is provided wherein it may be utilized in the necking in of a tubular member without there being relative movement between the die center thereof and the tubular member during the necking in of the tubular member.
Inventors
- 👤 Richard O Wahler
- 👤 Albert J Holk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:10
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D41/00; B21D41/04; B21D51/2638
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A method of necking in an end portion of a tubular member comprising the steps of fully positioning a die center within an end portion of a tubular member, engaging the extreme end portion of the tubular member with a forming portion of an outer ring die, progressively necking in the desired end portion of said tubular member around said die center, and during the initial necking in of said tubular member extreme end portion bringing said extreme end portion into positive engagement with a stop associated with said die center to prevent relative movement between said die center and said tubular member during the remainder of said necking in operation.
Claim 2
Independent Claim
111 words
A method of necking in an end portion of a tubular member comprising the steps of fully positioning a die center within an end portion of a tubular member, engaging the extreme end portion of the tubular member with a forming portion of an outer ring die, progressively necking in the desired end portion of said tubular member around said die center, and during the initial necking in of said tubular member extreme end portion bringing said extreme end portion into positive engagement with a stop associated with said die center to prevent relative movement between said die center and said tubular member during the remainder of said necking in operation.
Claim 3
Independent Claim
108 words
A methoD of necking in an end portion of a tubular member comprising the steps of fully positioning a die center within an end portion of a tubular member, engaging the extreme end portion of the tubular member with a forming portion of an outer ring die, progressively necking in the desired end portion of said tubular member around said die center, and said outer ring die being fully withdrawn from said tubular member prior to the withdrawal of said die center, and said tubular member being held stationary by a stripper engaged with the necked in portion of said tubular member as said die center is withdrawn.
Claim 4
Independent Claim
108 words
A methoD of necking in an end portion of a tubular member comprising the steps of fully positioning a die center within an end portion of a tubular member, engaging the extreme end portion of the tubular member with a forming portion of an outer ring die, progressively necking in the desired end portion of said tubular member around said die center, and said outer ring die being fully withdrawn from said tubular member prior to the withdrawal of said die center, and said tubular member being held stationary by a stripper engaged with the necked in portion of said tubular member as said die center is withdrawn.
Claim 5
Independent Claim
83 words
A method of necking in an end portion of a tubular member comprising the steps of fully positioning a die center within an end portion of a tubular member, engaging the extreme end portion of the tubular member with a forming portion of an outer ring die, progressively necking in the desired end portion of said tubular member around said die center, and said outer ring die and said die center being initially simultaneously positioned in telescoped relation relative to said tubular member.
Claim 6
Independent Claim
83 words
A method of necking in an end portion of a tubular member comprising the steps of fully positioning a die center within an end portion of a tubular member, engaging the extreme end portion of the tubular member with a forming portion of an outer ring die, progressively necking in the desired end portion of said tubular member around said die center, and said outer ring die and said die center being initially simultaneously positioned in telescoped relation relative to said tubular member.
Claim 7
Dependent Claim
74 words
A die assembly for necking in an end portion of a tubular member comprising an outer ring die having a recessed forming shoulder, and a die center having a stop shoulder at one end thereof, and means for independently advancing and retracing said outer ring die and said die center being operable to fully position said die center within a tubular member prior to the engagement of said forming shoulder within the tubular member.
Claim 8
Dependent Claim
74 words
A die assembly for necking in an end portion of a tubular member comprising an outer ring die having a recessed forming shoulder, and a die center having a stop shoulder at one end thereof, and means for independently advancing and retracing said outer ring die and said die center being operable to fully position said die center within a tubular member prior to the engagement of said forming shoulder within the tubular member.
Claim 9
Dependent Claim
56 words
The die assembly of claim 4 wherein said means are operable to position said stop shoulder in transverse alignment with an extreme end of a tubular member prior to engagement of said forming shoulder with the tubular member to prevent relative axial movement between said die center and the tubular member during the necking in thereof.
Claim 10
Dependent Claim
28 words
The die assembly of claim 5 wherein said means are operable to fully withdraw said outer die ring prior to the initial withdrawal movement of said die center.
Claim 11
Dependent Claim
28 words
The die assembly of claim 4 wherein said means are operable to fully withdraw said outer die ring prior to the initial withdrawal movement of said die center.
Claim 12
Dependent Claim
54 words
The die assembly of claim 8 wherein said means are operable to fully withdraw said outer die ring prior to the initial withdrawal movement of said die center, and a stripper for engaging a necked in portion of a tubular member for holding the tubular member stationary during the withdrawal of said die center.
Claim 13
Dependent Claim
28 words
The die assembly of claim 4 wherein there are two of said die assemblies mounted in opposed relation for simultaneously necking in opposite ends of a tubular member.
Claim 14
Dependent Claim
28 words
The die assembly of claim 4 wherein said die center and said outer ring die are mounted for rotation about an axis and said means includes fixed cams.
References Cited (Backward Citations)
US996122A
Cited
US1698999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |