Patent US4289410A successfully refreshed from Google Patents.
US4289410A
Expired / Lapsed
US
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Worm feed extruder for processing synthetics, rubber and like materials
Assignee: KraussMaffei Extrusion GmbH
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Filing: 1979-12-26
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Granted: 1981-09-15
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Expires: 1999-12-26
Abstract
Abstract In order to provide adaptability to a variety of material properties in a worm feed extruder for processing of synthetics or rubber, individual feed worm segments (7) and cylinder segments (10) surrounding the feed worm segments are provided at desired locations, the feed worm segments and cylinder segments being constructed divisible in the axial direction to enable these feed worm segments to be exchanged for feed worm segments of differing geometry. Removal of the cylinder (2, 3) or withdrawal of the feed worm (1) from the cylinder is thus avoided in the case where the feed worm is to be adapted to various material properties.
Inventors
- 👤 Dietmar Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:31
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/22; B30B11/24; B30B11/246; B29; B29C; B29C48/00; B29C48/25; B29C48/256; B29C48/2561; B29C48/2564; B29C48/36; B29C48/50; B29C48/68; B29C48/03; B29C48/505; B29C48/58
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A worm feed extruder for processing of synthetics, rubber, and like materials, comprising: a cylinder; and a feed worm arranged within said cylinder for rotation about a longitudinal axis, said feed worm being divided transversely to said longitudinal axis into a plurality of worm segments, said plurality of worm segments being mounted on a through-bolt extending along said axis; wherein at least one said worm segment is centrally divided in the direction of said longitudinal axis into worm segment parts, said cylinder is divided transversely to said longitudinal axis into a plurality of cylinder segments, and at least one cylinder segment surrounding and extending the length of said at least one worm segment in the direction of said longitudinal axis is centrally divided in the direction of said longitudinal axis into cylinder segment parts, whereby said at least one worm segment may be removed from said cylinder without removing all of said plurality of feed worm segments from said cylinder.
Claim 2
Dependent Claim
160 words
A worm feed extruder for processing of synthetics, rubber, and like materials, comprising: a cylinder; and a feed worm arranged within said cylinder for rotation about a longitudinal axis, said feed worm being divided transversely to said longitudinal axis into a plurality of worm segments, said plurality of worm segments being mounted on a through-bolt extending along said axis; wherein at least one said worm segment is centrally divided in the direction of said longitudinal axis into worm segment parts, said cylinder is divided transversely to said longitudinal axis into a plurality of cylinder segments, and at least one cylinder segment surrounding and extending the length of said at least one worm segment in the direction of said longitudinal axis is centrally divided in the direction of said longitudinal axis into cylinder segment parts, whereby said at least one worm segment may be removed from said cylinder without removing all of said plurality of feed worm segments from said cylinder.
Claim 3
Dependent Claim
27 words
A worm feed extruder according to claim 1, further comprising means for fastening together said worm segment parts of said at least one centrally divided worm segment.
Claim 4
Dependent Claim
35 words
A worm feed extruder according to claim 1, wherein said at least one centrally divided cylinder segment has end faces, said end faces having step-wise recesses for engaging end faces of adjacent said cylinder segments.
Claim 5
Dependent Claim
59 words
A worm feed extruder according to claim 1, wherein said at least one centrally-divided cylinder segment is disposed between adjacent said cylinder segments, said adjacent cylinder segments having flanges extending radially outwardly of said longitudinal axis, further comprising tensioning means for engaging said flanges to bias said adjacent cylinder segments against said at least one centrally divided cylinder segment.
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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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |