Patent US3875779A successfully refreshed from Google Patents.
US3875779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming of materials
Assignee: Bridon Ropes Ltd
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Filing: 1973-11-19
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Granted: 1975-04-08
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Expires: 1993-11-19
Abstract
Abstract Method and apparatus for producing from a workpiece, such as a billet, product of reduced cross section, such as wire. A load pattern is applied to the workpiece which induces compressive stresses at a localised region of the workpiece at an orifice defining the product cross section. Heat is applied to the workpiece at a localised region adjacent the orifice. The compressive stresses and heat applied are such that the material of the workpiece is caused to flow through the orifice.
Inventors
- 👤 Stuart Pugh
- 👤 Douglas Gordon Smith
- 👤 Brian Neil Manton
- 👤 Graham Frederick Whittaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:35
CPC Classifications
B; B21; B21C; B21C29/00; B21C1/00; B21C1/16; B21C1/22; B21C1/24; B21C1/26; B21C23/00; B21C23/005; B21C23/02; B21C23/03; B21C23/035
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A method of producing from a workpiece a product of reduced cross section comprising applying a load pattern which induces compressive stresses at a localised region of the workpiece at an orifice defining the product cross section and applying heat to the workpiece at only a localised region adjacent the orifice, the compressive stresses and the heat applied being such as to cause the material of the workpiece to flow through the orifice.
Claim 2
Independent Claim
73 words
A method of producing from a workpiece a product of reduced cross section comprising applying a load pattern which induces compressive stresses at a localised region of the workpiece at an orifice defining the product cross section and applying heat to the workpiece at only a localised region adjacent the orifice, the compressive stresses and the heat applied being such as to cause the material of the workpiece to flow through the orifice.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1 wherein the heat is applied by directing a tungsten inert gas torch against the workpiece.
Claim 4
Dependent Claim
40 words
A method as claimed in claim 1 wherein the compressive stresses are induced by applying an axial load between a billet comprising the workpiece and a die head containing the orifice and by rotating the billet relative to the diehead.
Claim 5
Dependent Claim
60 words
Apparatus for producing from a workpiece a product of reduced cross section comprising: means defining an orifice adapted to form said product cross section; means for applying a load pattern which induces compressive stresses at a localised region of the workpiece at said orifice; and means for applying heat at only a localised region of the workpiece adjacent the orifice.
Claim 6
Dependent Claim
60 words
Apparatus for producing from a workpiece a product of reduced cross section comprising: means defining an orifice adapted to form said product cross section; means for applying a load pattern which induces compressive stresses at a localised region of the workpiece at said orifice; and means for applying heat at only a localised region of the workpiece adjacent the orifice.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 4 wherein the means for applying heat comprises a tungsten inert gas torch.
Claim 8
Dependent Claim
44 words
Apparatus as claimed in claim 4 wherein the means for inducing compressive stresses comprises means for applying an axial load between a billet comprising the workpiece and a die head containing the orifice, the billet being mountable for rotation relative to the die head.
Claim 9
Dependent Claim
24 words
Apparatus as claimed in claim 6 wherein the billet is tubular and is mounted on a mandrel for rotation relative to the die head.
Claim 10
Dependent Claim
18 words
Apparatus as claimed in claim 6 wherein the means for applying an axial load includes a hydraulic ram.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |