US4590655A
Expired / Lapsed
US
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Method for expanding a tubular member
Assignee: Grotnes Metalforming Systems Inc
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Filing: 1985-06-24
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Granted: 1986-05-27
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Expires: 2005-06-24
Abstract
Abstract A tubular metal member undergoes expansion transverse to the longitudinal axis of the member. An axial compressive load is applied to the member parallel to the member's longitudinal axis, and the member is allowed to deform transversely to said axis. Procedures are employed to control the deformation of the member, to prevent the member from buckling, and to ensure that the ends of the member will be expanded uniformly with the remainder of the member.
Inventors
- 👤 Laszlo Javorik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:48
CPC Classifications
B; B21; B21D; B21D31/00; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/29; B21C37/294; B21D17/00; B21D17/02; B21D17/025; B21D22/00; B21D22/10; B21D22/105; C; C21; C21D; C21D7/00; C21D7/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/53; Y10T29/53652
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
71 words
A method for expanding a tubular member in at least one direction transverse to the longitudinal axis of said member, said method comprising the steps of: applying a compressive load to said member with said load being parallel to the longitudinal axis of said member; and allowing said member to deform in said transverse direction substantially without the application of hydraulic pressure to the interior of said member and without buckling.
Claim 2
Independent Claim
71 words
A method for expanding a tubular member in at least one direction transverse to the longitudinal axis of said member, said method comprising the steps of: applying a compressive load to said member with said load being parallel to the longitudinal axis of said member; and allowing said member to deform in said transverse direction substantially without the application of hydraulic pressure to the interior of said member and without buckling.
Claim 3
Dependent Claim
25 words
A method as recited in claim 1 and including the step of: confining said member so as to limit said deformation in said transverse direction.
Claim 4
Dependent Claim
32 words
A method as recited in claim 2 wherein said confining step comprises: enclosing said member in an encasement such that said encasement limits outward deformation of said member in said transverse direction.
Claim 5
Dependent Claim
22 words
A method as recited in claim 3 wherein: said enclosing step allows localized outward deformation of said member in said transverse direction.
Claim 6
Dependent Claim
32 words
A method as recited in claim 2 wherein said confining step comprises: providing within said member an insert which limits inward deformation or wall buckling of said member in said transverse direction.
Claim 7
Dependent Claim
42 words
A method as recited in claim 1 wherein said applying step comprises: providing a piston; urging said piston against one end of said member; and restraining the other end of said member from movement parallel to said longitudinal axis of said member.
Claim 8
Dependent Claim
35 words
A method as recited in claim 1 wherein said applying step comprises: providing a pair of opposing pistons; and urging each of said pair of opposing pistons against a respective opposite end of said member.
Claim 9
Dependent Claim
69 words
A method as recited in claim 1 wherein said applying step comprises: providing a piston having a beveled face; urging said piston having said beveled face against one end of said member; said urging step causing transversely outwardly directed friction-opposing forces to be applied to said one end of said member; and restraining the other end of said member from movement parallel to said longitudinal axis of said member.
Claim 10
Dependent Claim
27 words
A method as recited in claim 8 wherein: said restraining step causes transversely outwardly directed friction-opposing forces to be applied to said other end of said member.
Claim 11
Dependent Claim
73 words
A method as recited in claim 1 wherein said applying step comprises: providing a pair of opposing pistons each located at a respective opposite end of said member; and urging each piston against said respective opposite end of said member in a direction parallel to the longitudinal axis of said member; said urging step causing transversely outwardly directed friction-opposing forces to be applied to at least one of said ends of said member.
Claim 12
Dependent Claim
46 words
A method as recited in claim 1 wherein said applying step comprises: compressing said member with a load of a magnitude less than approximately one-hundred ten percent of the true ultimate strength of said member so as to maintain the original wall thickness of said member.
Claim 13
Dependent Claim
45 words
A method as recited in claim 1 wherein said applying step comprises: compressing said member with a load of a magnitude greater than approximately one-hundred ten percent of the true ultimate strength of said member so as to increase the wall thickness of said member.
Claim 14
Dependent Claim
39 words
A method as recited in claim 1 wherein said applying step comprises: compressing said member with a load of a magnitude greater than the elastic limit of said member so as to increase the elastic limit of said member.
Claim 15
Dependent Claim
42 words
A method as recited in claim 1 wherein said applying step comprises: compressing said member with a load of a magnitude greater than the yield strength of said member so as to increase the yield strength and elastic limit of said member.
Claim 16
Dependent Claim
46 words
A method as recited in claim 1 wherein said applying step comprises: compressing said member with a load of a magnitude greater than the true ultimate strength of said member so as to increase the true ultimate strength, yield strength and elastic limit of said member.
Claim 17
Independent Claim
116 words
A method for lining a first member having an axially extending tubular cavity with a second tubular member, said method comprising the steps of: inserting said second member inside of said first member; and expanding said second member in directions transverse to the longitudinal axis of said second member substantially without the application of hydraulic pressure to the interior of said second member until the outer surface of said second member contacts the inner surface of said first member; said expanding step comprising the steps of applying a compressive load to said second member with said load being parallel to said longitudinal axis and allowing said second member to deform in said transverse directions without buckling.
Claim 18
Independent Claim
116 words
A method for lining a first member having an axially extending tubular cavity with a second tubular member, said method comprising the steps of: inserting said second member inside of said first member; and expanding said second member in directions transverse to the longitudinal axis of said second member substantially without the application of hydraulic pressure to the interior of said second member until the outer surface of said second member contacts the inner surface of said first member; said expanding step comprising the steps of applying a compressive load to said second member with said load being parallel to said longitudinal axis and allowing said second member to deform in said transverse directions without buckling.
Claim 19
Dependent Claim
44 words
A method as recited in claim 16 wherein said applying step comprises: providing a piston; urging said piston against one end of said second member; and restraining the other end of said second member from movement parallel to said longitudinal axis of said member.
Claim 20
Dependent Claim
36 words
A method as recited in claim 16 wherein said applying step comprises: providing a pair of opposing pistons; and urging each of said pair of opposing pistons against a respective opposite end of said second member.
Claim 21
Dependent Claim
73 words
A method as recited in claim 16 wherein said applying step comprises: providing a piston having a beveled face; urging said piston having said beveled face against one end of said second member; said urging step causing transversely outwardly directed friction-opposing forces to be applied to said one end of said second member; and restraining the other end of said second member from movement parallel to said longitudinal axis of said second member.
Claim 22
Dependent Claim
28 words
A method as recited in claim 17 wherein: said restraining step causes transversely outwardly directed friction-opposing forces to be applied to said other end of said second member.
Claim 23
Dependent Claim
77 words
A method as recited in claim 16 wherein said applying step comprises: providing a pair of opposing pistons each located at a respective opposite end of said second member; and urging each piston against said respective opposite end of said second member in a direction parallel to the longitudinal axis of said second member; said urging step causing transversely outwardly directed friction-opposing forces to be applied to at least one of said ends of said second member.
Claim 24
Independent Claim
71 words
An apparatus for expanding a tubular member in at least one direction transverse to the longitudinal axis of said member, said apparatus comprising: means for applying to said member a compressive load parallel to the longitudinal axis of said member; and means for allowing said member to deform in said transverse direction without buckling; said apparatus being devoid of means for applying substantial hydraulic pressure to the interior of said member.
Claim 25
Independent Claim
71 words
An apparatus for expanding a tubular member in at least one direction transverse to the longitudinal axis of said member, said apparatus comprising: means for applying to said member a compressive load parallel to the longitudinal axis of said member; and means for allowing said member to deform in said transverse direction without buckling; said apparatus being devoid of means for applying substantial hydraulic pressure to the interior of said member.
Claim 26
Dependent Claim
22 words
The apparatus of claim 22 and including: means for confining said member so as to limit said deformation in said transverse direction.
Claim 27
Dependent Claim
40 words
The apparatus of claim 23, wherein said confining means comprises: an encasement surrounding said member; said encasement having an inner surface that is transversely outwardly spaced from said member to allow outward deformation of said member in said transverse direction.
Claim 28
Dependent Claim
27 words
The apparatus of claim 24 wherein: said encasement includes a localized recess in said inner surface to allow localized deformation of said member in said transverse direction.
Claim 29
Dependent Claim
53 words
The apparatus of claim 23, wherein said confining means comprises: an encasement surrounding said member; said encasement having an inner surface that substantially conforms to and is very closely spaced relative to said member; and said encasement having a localized recess to allow only localized deformation of said member in said transverse direction.
Claim 30
Dependent Claim
31 words
The apparatus of claim 23, wherein said confining means comprises: an insert located inside of said member to limit inward deformation or wall buckling of said member in said transverse direction.
Claim 31
Dependent Claim
61 words
The apparatus of claim 22, wherein said applying means comprises: a piston means axially adjacent one end of said member; means for urging said piston means against said one end of said member; and means axially adjacent the end of said member opposite said one end for restraining said opposite end from movement parallel to the longitudinal axis of said member.
Claim 32
Dependent Claim
48 words
The apparatus of claim 28, wherein: at least one of said piston means and said restraining means includes a beveled face comprising means for causing transversely outwardly directed friction-opposing forces to be applied to a respective end of said member when said member is under said compressive load.
Claim 33
Dependent Claim
37 words
The apparatus of claim 22, wherein said applying means comprises: a piston means axially adjacent each end of said member; and means for urging each of said piston means against a respective opposite end of said member.
Claim 34
Dependent Claim
43 words
The apparatus of claim 30, wherein: at least one of said piston means includes a beveled face comprising means causing transversely outwardly directed friction-opposing forces to be applied to said respective end of said member when said member is under said compressive load.
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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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |