Patent US4362485A successfully refreshed from Google Patents.
US4362485A
Expired / Lapsed
US
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Apparatus for continuous extrusion
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1981-05-15
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Granted: 1982-12-07
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Expires: 2001-05-15
Abstract
Abstract Apparatus for continuous extrusion has a rotatable wheel with an endless groove therein, a relatively stationary shoe member overlying part of the groove lengthwise, a portion of the shoe member projecting part way into the groove and being constituted at least partly by a die assembly which includes a separate and replaceable abutment member which projects into the groove to block it. The die assembly can have separate and replaceable components constituting a feed chamber, a die throat, and optionally a mandrel supported in the die throat for producing tubular extrusion products. Cooling of the die assembly is also envisaged.
Inventors
- 👤 Harold K. Slater
- 👤 James Duckworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:53
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/005; B21C25/00; B21C25/02; B21C29/00; B21C29/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
Continuous extrusion apparatus comprising a rotatable wheel with an endless groove therein, a relatively stationary shoe member overlying part of said groove lengthwise and having a portion projecting part way into said groove, a die assembly removably and replaceably incorporated as an assembly in said shoe member so as to provide at least a part of the projecting portion thereof, a removable and replaceable abutment member formed by a removable and replaceable part of said die assembly, said abutment member projecting into and blocking said groove, removable and replaceable die means forming part of said die assembly, and fluid coolant passage means for effecting cooling of said die assembly and its parts, whereby feedstock material fed to the passageway formed by said shoe member projecting portion and that part of said groove into which it projects and with which it cooperates is caused by the force generated by friction between the groove floor and sides of the feedstock material on rotation of said wheel and by the presence of said abutment which blocks one end of said passageway, to become upset and to be extruded through said die means of said die assembly.
Claim 2
Dependent Claim
193 words
Continuous extrusion apparatus comprising a rotatable wheel with an endless groove therein, a relatively stationary shoe member overlying part of said groove lengthwise and having a portion projecting part way into said groove, a die assembly removably and replaceably incorporated as an assembly in said shoe member so as to provide at least a part of the projecting portion thereof, a removable and replaceable abutment member formed by a removable and replaceable part of said die assembly, said abutment member projecting into and blocking said groove, removable and replaceable die means forming part of said die assembly, and fluid coolant passage means for effecting cooling of said die assembly and its parts, whereby feedstock material fed to the passageway formed by said shoe member projecting portion and that part of said groove into which it projects and with which it cooperates is caused by the force generated by friction between the groove floor and sides of the feedstock material on rotation of said wheel and by the presence of said abutment which blocks one end of said passageway, to become upset and to be extruded through said die means of said die assembly.
Claim 3
Dependent Claim
47 words
Continuous extrusion apparatus according to claim 1, wherein the die assembly includes a removable and replaceable insert defining a feed chamber in communication with said passageway and said die means, whereby upset feedstock collects in said feed chamber from said passageway before passing to said die means.
Claim 4
Dependent Claim
28 words
Continuous extrusion apparatus according to claim 2, wherein said die means includes a removable and replaceable insert forming a separate die throat in communication with said feed chamber.
Claim 5
Dependent Claim
60 words
Continuous extrusion apparatus according to claim 2, wherein said die assembly includes a die body having an aperture, and said feed chamber is formed by an annular insert member accommodated in said aperture in the body of the die assembly, the said aperture extending from said projecting portion of the die assembly where it is in communication with said passageway.
Claim 6
Dependent Claim
42 words
Continuous extrusion apparatus according to claim 4, wherein said die throat is formed in and by an annular insert member and is disposed in said aperture of said die body in a position adjacent the annular member which constitutes said feed chamber.
Claim 7
Dependent Claim
129 words
Apparatus as claimed in claim 1 wherein said die assembly includes a unitary removable and replaceable die body having, considered in the direction of rotation of said wheel, a first portion projecting partway into said groove and a second portion spaced from said first portion and projecting further into said groove, an aperture opening into said groove and located between said first and second portions relatively adjacent said first portion and containing said removable and replaceable die means, and a slot formed in said die body between said aperture and said second portion and opening toward said groove, said abutment member having its base removably disposed in said slot and projecting outwardly therefrom into said groove, and abutting its rearward face against the forward face of said second portion.
Claim 8
Dependent Claim
34 words
Apparatus as claimed in claim 6 wherein said fluid coolant passage means includes interconnecting passages formed in said die body and said abutment member, and adapted for connection with a supply of fluid coolant.
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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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |