US4383764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous extrusion without reverse flow of material
Assignee: Individual
•
Filing: 1981-05-12
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Granted: 1983-05-17
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Expires: 2001-05-12
Abstract
Abstract An apparatus for continuous extrusion of a material including a hollow barrel with inner liner having a cylindrical chamber portion and an outwardly divergent, coaxial frusto-conical outlet chamber portion adjacent thereto so that reverse pressure developed by extrusion of the material results in sealing engagement of the frusto-conical screw and barrel portions thereby effectively preventing regurgitation of the material. A fluted screw is rotatably positioned coaxially within the barrel and liner, and has both cylindrical and outwardly divergent outer thread surface portions conforming to the inner surface of the cylindrical and the frusto-conical chamber portions, respectively, of the barrel and liner. Rotation of the screw forces the material to flow axially through the barrel along the threads of the screw toward the outlet chamber portion and through an extrusion die. Resistance of the die to the flow of material results in a force in the reverse direction being exerted on the threads of the frusto-conical chamber portion establishing an effective, fluid-tight seal to prevent reverse flow or regurgitation of the material between the screw and the barrel liner.
Inventors
- 👤 Leon Sloin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:29
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/67; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/424; B29B7/428; B29B7/429; B29B7/74; B29B7/7476; B29B7/7495; B29B7/80; B29B7/82; B29B7/826; B29B7/86; B29C48/395; B29C48/52; B29C48/525; B29C48/03
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
300 words
An apparatus for continuous extrusion of a material without reverse flow of material, comprising: a hollow barrel having a cylindrical chamber portion and a frusto-conical chamber portion diverging outwardly from said cylindrical chamber portion; a threaded screw rotatably positioned coaxially within said hollow barrel, said screw having a threaded cylindrical screw portion located within said cylindrical chamber portion and a threaded frusto-conical portion located within said frusto-conical chamber portion diverging from said cylindrical screw portion, said screw threads defining a cylindrical outer surface conforming to the inner surface of said cylindrical chamber portion and a tapered outer surface conforming to the inner surface of said frusto-conical chamber portion; inlet means for feeding the material into said hollow barrel; driving means coupled to said screw for rotating said screw within said barrel so as to force the material to flow axially through said barrel in a forward direction toward an outlet end of said barrel adjacent said frusto-conical chamber portion opposite said cylindrical chamber portion; outlet means connected to said outlet end of said barrel for expelling the material accompanied by a reverse pressure resulting from the resistance of said outlet means to said forward flow of the material, said tapered outer surface of said screw cooperating with said inner surface of said frusto-conical chamber portion and forming a seal in response to said reverse pressure exerting a force on said threads of said frusto-conical portion in a direction opposite to said forward flow of the material, whereby reverse flow of the material between said screw and barrel in said opposite direction is prevented; and adjusting means coupled to said screw for axially displacing said screw by a predetermined amount thereby controlling the contact between said tapered outer surface of said screw and said inner surface of said frusto-conical chamber portion.
Claim 2
Independent Claim
300 words
An apparatus for continuous extrusion of a material without reverse flow of material, comprising: a hollow barrel having a cylindrical chamber portion and a frusto-conical chamber portion diverging outwardly from said cylindrical chamber portion; a threaded screw rotatably positioned coaxially within said hollow barrel, said screw having a threaded cylindrical screw portion located within said cylindrical chamber portion and a threaded frusto-conical portion located within said frusto-conical chamber portion diverging from said cylindrical screw portion, said screw threads defining a cylindrical outer surface conforming to the inner surface of said cylindrical chamber portion and a tapered outer surface conforming to the inner surface of said frusto-conical chamber portion; inlet means for feeding the material into said hollow barrel; driving means coupled to said screw for rotating said screw within said barrel so as to force the material to flow axially through said barrel in a forward direction toward an outlet end of said barrel adjacent said frusto-conical chamber portion opposite said cylindrical chamber portion; outlet means connected to said outlet end of said barrel for expelling the material accompanied by a reverse pressure resulting from the resistance of said outlet means to said forward flow of the material, said tapered outer surface of said screw cooperating with said inner surface of said frusto-conical chamber portion and forming a seal in response to said reverse pressure exerting a force on said threads of said frusto-conical portion in a direction opposite to said forward flow of the material, whereby reverse flow of the material between said screw and barrel in said opposite direction is prevented; and adjusting means coupled to said screw for axially displacing said screw by a predetermined amount thereby controlling the contact between said tapered outer surface of said screw and said inner surface of said frusto-conical chamber portion.
Claim 3
Dependent Claim
32 words
An apparatus as recited in claim 1, further comprising vacuum means coupled to said barrel for removing impurities separated from the material during said forward flow of the material through said barrel.
Claim 4
Dependent Claim
32 words
An apparatus as recited in claim 2 further comprising a viewing port provided in said barrel adjacent said vacuum means for visually inspecting said screw and the material flowing through said barrel.
Claim 5
Dependent Claim
50 words
An apparatus as recited in claim 3 wherein said threads of said screw have a pitch which is increased in a region proximate said viewing port, whereby flowing of the material through said region and over said threads of increased pitch causes said impurities to be separated from the material.
Claim 6
Dependent Claim
42 words
An apparatus as recited in claim 1, wherein said inlet means comprises an inlet port provided in said cylindrical chamber portion of said barrel and means driven by said driving means for feeding the material through said inlet port into said barrel.
Claim 7
Dependent Claim
21 words
An apparatus as defined in claim 1, further comprising a replaceable liner provided on the interior surface of said hollow barrel.
Claim 8
Dependent Claim
23 words
An apparatus as recited in claim 6, wherein said frusto-conical portion of said screw is detachable from said cylindrical portion of said screw.
Claim 9
Dependent Claim
38 words
An apparatus as recited in claim 7, wherein said outlet means comprises an extrusion head removably connected to said outlet end of said barrel for providing ready access to said detachable frusto-conical screw portion and said replaceable liner.
Claim 10
Dependent Claim
27 words
An apparatus as reicted in claim 6 further comprising a liquid coolant provided between said liner and said interior surface of said barrel, thereby cooling said barrel.
Claim 11
Dependent Claim
44 words
An apparatus as recited in claim 6 wherein a portion of said replaceable liner located on the interior surface of said frusto-conical chamber portion is removable separately from a portion of said replaceable liner located on the interior surface of said cylindrical chamber portion.
Claim 12
Dependent Claim
26 words
An apparatus as recited in claim 1 wherein said screw includes an interior passage and a fluid provided in said passage for cooling of said screw.
Claim 13
Dependent Claim
21 words
An apparatus as recited in claim 1 wherein said adjusting means includes a first adjusting member coaxially positioned about said screw.
Claim 14
Dependent Claim
66 words
An apparatus as recited in claim 12 wherein said adjusting means further includes a second adjusting member coaxially positioned about said screw and having a surface provided with a plurality of threads for engaging a corresponding plurality of threads provided on a surface of said first adjusting member, whereby rotation of said first and second adjusting means relative each other effects axial displacement of said screw.
Claim 15
Dependent Claim
43 words
An apparatus as recited in claim 13 wherein said screw is provided with a circumferential groove engaging a corresponding lip portion of said first adjusting member for translating rotational movement of said first and second adjusting members into axial displacement of said screw.
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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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |