Patent US5287192A successfully refreshed from Google Patents.
Patent US3748885A successfully refreshed from Google Patents.
US3748885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion machine
Assignee: Individual
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Filing: 1970-12-04
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Granted: 1973-07-31
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Expires: 1990-12-04
Abstract
Abstract A thermal-extrusion machine is disclosed with an extrusion head for the production of metal sections and tubes, particularly of light copper-based alloys. The extrusion head comprises a core coaxially received in an aperture of an associated die. The core is supported by bridging means in the form of webs angularly equispaced about the axis thereof. A chamber is formed in the head and downstream of the webs, to transverse section of the chamber being sufficiently small to let the pressure of the material being extruded fuse the strands formed by the material passing the webs and reuniting in the chamber.
Inventors
- 👤 R Creuzet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:20
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
An extrusion head for producing tubular objects from a fusible metallic composition, comprising: a cylinder adapted to be filled with a heated metallic mass; an extrusion die forming an end wall of said cylinder, said die being provided with a discharge aperture; a central core in said cylinder extending with all-around clearance into said aperture; a support for said core in said cylinder, said support comprising an annular base adjacent said die and bridging means extending from said base to said core, said bridging means forming with said base a passage for said mass narrow1ng progressively toward said opening, said bridging means terminating short of said die whereby a annular channel larger than said aperture is formed between said passage and said aperture, said channel being bounded by an inner peripheral surface of said base converging toward said opening; and plunger means in said cylinder for compressing said mass around said core and forcing the compressed mass through said passage and said channel into the clearance between said core and said die. an
Claim 2
Dependent Claim
173 words
An extrusion head for producing tubular objects from a fusible metallic composition, comprising: a cylinder adapted to be filled with a heated metallic mass; an extrusion die forming an end wall of said cylinder, said die being provided with a discharge aperture; a central core in said cylinder extending with all-around clearance into said aperture; a support for said core in said cylinder, said support comprising an annular base adjacent said die and bridging means extending from said base to said core, said bridging means forming with said base a passage for said mass narrow1ng progressively toward said opening, said bridging means terminating short of said die whereby a annular channel larger than said aperture is formed between said passage and said aperture, said channel being bounded by an inner peripheral surface of said base converging toward said opening; and plunger means in said cylinder for compressing said mass around said core and forcing the compressed mass through said passage and said channel into the clearance between said core and said die. an
Claim 3
Dependent Claim
25 words
An extrusion head as defined in claim 1 wherein said bridging means comprises a plurality of webs extending radially from said base to said core.
Claim 4
Dependent Claim
42 words
An extrusion head as defined in claim 2 wherein said webs have ridges remote from said die merging tangentially into said core at a rounded rear end thereof, each web having a profile bounded by flanks meeting at a front edge thereof.
Claim 5
Dependent Claim
25 words
An extrusion head as defined in claim 3 wherein said inner peripheral surface is generally frustoconical in cross-section and has generatrices substantially paralleling said flanks.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |