Patent US3645659A successfully refreshed from Google Patents.
US3645659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruding plastic
Assignee: Gloucester Engineering Co Inc
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Filing: 1969-03-13
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Granted: 1972-02-29
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Expires: 1989-03-13
Abstract
Abstract An extruder is shown having: cooled screw in the feeder section; rotation retarding means in the barrel of the feeder section in the form of open mouth axial grooves; the vertical arrangement of the extruder with the hopper immersing the cooled portion of the screw with inlet plastic such as flakes of scrap; an extension of the screw into the hopper agitating the flakes and housing water inlet to the feeder; a drive shank at the outlet end isolated by an internal air chamber from the heated extruder; the shank cooled by an inserted cooling member; a sealing member surrounding the shank defining a restricted passage that tapers and accommodates eccentricity; the stationary walls of the surrounding member are grooved, resisting outward leakage of the plastic. These various features are shown to enable feeding of difficult materials and scrap and to achieve a compact, simple, efficient machine.
Inventors
- 👤 Charles M Schott Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:20
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/22; B30B11/24; B29; B29B; B29B17/00; B29B17/0005; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/25; B29C48/254; B29C48/285; B29C48/286; B29C48/288; B29C48/29; B29C48/36; B29C48/395; B29C48/50; B29C48/501; B29C48/505; B29C48/51; B29C48/515; B29C48/53; B29C48/68; B29C48/685; B29C48/686; B29C48/78; B29C48/793; B29C48/797; B29C48/80; B29C48/84; B29C48/85; B29C48/88; B29C48/919; B29C48/64; B29L; B29L2007/00; B29L2007/008; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
In an extruder for extruding scrap plastic and the like comprising a hopper, a heated extruder barrel containing an extruder screw and a drive means for said screw, wherein said extruder has a feeder comprising initial portions of said barrel and screw, said initial screw portion having means for liquid cooling, the internal surface of said initial barrel portion having rotation retarding means extending along the length thereof, said barrel extending upwardly, with said feeder at the upper end, and opening upwardly to receive plastic from said hopper, said extruder being vertically arranged, said drive means being mounted at the base of said extruder, the shank of said extruder screw extending beyond the outlet of said extruder to said drive means, said shank being hollow and defining an insulating air-containing chamber closely adjacent the level of said outlet.
Claim 2
Dependent Claim
138 words
In an extruder for extruding scrap plastic and the like comprising a hopper, a heated extruder barrel containing an extruder screw and a drive means for said screw, wherein said extruder has a feeder comprising initial portions of said barrel and screw, said initial screw portion having means for liquid cooling, the internal surface of said initial barrel portion having rotation retarding means extending along the length thereof, said barrel extending upwardly, with said feeder at the upper end, and opening upwardly to receive plastic from said hopper, said extruder being vertically arranged, said drive means being mounted at the base of said extruder, the shank of said extruder screw extending beyond the outlet of said extruder to said drive means, said shank being hollow and defining an insulating air-containing chamber closely adjacent the level of said outlet.
Claim 3
Dependent Claim
19 words
The extruder of claim 1 including means for cooling the portion of said shank below said insulating air-containing chamber.
Claim 4
Dependent Claim
27 words
The extruder of claim 2 including a plug inserted into the hollow lower end of the shank, said plug containinG liquid passages defining said means for cooling.
Claim 5
Dependent Claim
32 words
The extruder of claim 3 including a seal means surrounding said cooled portion of said shank, said seal portion having a clearance from the outer surface of said shank which decreases downwardly.
Claim 6
Dependent Claim
91 words
In an extruder assembly having means driving the screw from the discharge end, said screw having a shank protruding from the barrel, said shank being hollow and defining an air-containing isolation chamber in the region close to the outlet of said extruder, and means to cool the outer end portion of said shank; the assembly in the form of a short, effective extruder, the feeder portion of said extruder including means to cool the feeder portion of the screw, and means to heat the transition and metering portions of said extruder.
Claim 7
Dependent Claim
91 words
In an extruder assembly having means driving the screw from the discharge end, said screw having a shank protruding from the barrel, said shank being hollow and defining an air-containing isolation chamber in the region close to the outlet of said extruder, and means to cool the outer end portion of said shank; the assembly in the form of a short, effective extruder, the feeder portion of said extruder including means to cool the feeder portion of the screw, and means to heat the transition and metering portions of said extruder.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |