US3768288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of tube from ductile metal
Assignee: Jury & Spiers Pty Ltd
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Filing: 1972-02-22
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Granted: 1973-10-30
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Expires: 1992-02-22
Abstract
Abstract The invention relates to a process for forming a thin walled tubing which may either be linear or formed to a shape as for example for a heat exchanger, and includes the following steps: A. FLATTENING A TUBULAR WORK PIECE, B. ROLLING THE FLATTENED MEMBER SO AS TO INCREASE ITS LENGTH AND REDUCE ITS WALL THICKNESS WITHOUT SUBSTANTIALLY INCREASING ITS WIDTH, AND C. INTRODUCING FLUID INTO THE MEMBER AT SUFFICIENT PRESSURE TO DEFORM ITS CONTIGUOUS WALLS AWAY FROM ONE ANOTHER.
Inventors
- 👤 H Jury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:03
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A process for the production of thin walled tube, comprising the steps of: a. advancing a tubular flattened member in the direction of its longitudinal axis a number of times between rollers so positioned as to both extend the length of the member and reduce its wall thickness during each pass, b. annealing the flattened member between passes, c. placing the resulting member into a hollow die having the configuration of the required article, d. closing the ends of the flattened member, e. introducing fluid into the space between the contiguous walls at a pressure sufficient to deform the contiguous walls away from one another and into the hollow of the die and thereby form a tube having greater and smaller wall thickness than the work piece and of a shape defined by the said die.
Claim 2
Dependent Claim
136 words
A process for the production of thin walled tube, comprising the steps of: a. advancing a tubular flattened member in the direction of its longitudinal axis a number of times between rollers so positioned as to both extend the length of the member and reduce its wall thickness during each pass, b. annealing the flattened member between passes, c. placing the resulting member into a hollow die having the configuration of the required article, d. closing the ends of the flattened member, e. introducing fluid into the space between the contiguous walls at a pressure sufficient to deform the contiguous walls away from one another and into the hollow of the die and thereby form a tube having greater and smaller wall thickness than the work piece and of a shape defined by the said die.
Claim 3
Dependent Claim
40 words
A process according to claim 1 comprising the further step of bending the flattened member on its longitudinal axis prior to placing the member into the die, the die having a cavity corresponding to the bent shape of the member.
Claim 4
Dependent Claim
24 words
A process according to claim 1 comprising the further step of forming the tubular work piece to a conical shape before flattening and elongating.
Claim 5
Dependent Claim
49 words
A process according to claim 1 comprising the further step of forming a conical opening in one end of the flattened member, closing the conical opening with a hollow closure member, and introducing said fluid at pressure into the space between the contiguous walls through the hollow closure member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |