Patent US3924839A successfully refreshed from Google Patents.
US3924839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously operating screw conveyor
Assignee: Werner and Pfleiderer GmbH
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Filing: 1973-10-04
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Granted: 1975-12-09
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Expires: 1993-10-04
Abstract
Abstract Material working screw. There is provided a screw for working flowable material having means therein for preventing laminar flow through the flights thereof. Transverse shearing webs extend between flights, are suitably spaced from each other and are of sufficiently less radial extent than said adjacent flights as to provide a pass-through zone between the top of each of such webs and the housing surrounding the screw. Transverse splitting webs also extend between said flights, are positioned between said shearing webs and define a slot extending in a direction having at least a radial component with respect to the axis of the screw. Thus, material passing over a shearing web cannot by laminar flow pass through the slot of such splitting web but instead the material passing through the slot of the splitting web is of a different radial orientation than that passing over the shearing web. Accordingly, laminar flow is broken up, the material further mixed and kneaded, and the desired working thereof accomplished.
Inventors
- 👤 Christian Millauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:47
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/428; B29B7/429; A; A21; A21C; A21C1/00; A21C1/06; A21C1/065; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/59; B29C48/605; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/114; B01F27/1143; B01F27/60; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
186 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights thereon defining a screw channel therebetween and transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising at least one transverse splitting web located in said screw channel intermediate the ends of said flow path, said splitting web having a height equal to the height of said screw flights, said splitting web having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, said splitting web and said second shearing gap turning a flat laminar flow in said screw channel generated by said first shearing gap by an angle equal to the angular spacing between said first and second shearing gaps, at least one transverse splitting web being disposed between two transverse shearing webs.
Claim 2
Dependent Claim
186 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights thereon defining a screw channel therebetween and transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising at least one transverse splitting web located in said screw channel intermediate the ends of said flow path, said splitting web having a height equal to the height of said screw flights, said splitting web having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, said splitting web and said second shearing gap turning a flat laminar flow in said screw channel generated by said first shearing gap by an angle equal to the angular spacing between said first and second shearing gaps, at least one transverse splitting web being disposed between two transverse shearing webs.
Claim 3
Dependent Claim
32 words
The improved screw conveyor according to claim 1, wherein each second shearing gap extends from the free outer edge of the associated transverse splitting web in the direction of the base thereof.
Claim 4
Dependent Claim
28 words
The improved screw conveyor according to claim 1, wherein each second shearing gap has parallel boundary walls which extend radially with respect to the axis of the screw.
Claim 5
Dependent Claim
23 words
The improved screw conveyor according to claim 1, wherein each second shearing gap tapers towards the base of the associated transverse splitting web.
Claim 6
Dependent Claim
25 words
The improved screw conveyor according to claim 1, wherein said second shearing gap is disposed in the center area of the associated transverse splitting web.
Claim 7
Dependent Claim
26 words
The improved screw conveyor according to claim 1, wherein said second shearing gap is disposed in the marginal lateral area of the associated transverse splitting web.
Claim 8
Dependent Claim
19 words
The improved screw conveyor according to claim 1, wherein a radial component for said first shearing gap is 0*.
Claim 9
Dependent Claim
19 words
The improved screw conveyor according to claim 7, wherein said radial component for said second shearing gap is 90*.
Claim 10
Dependent Claim
158 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights therein defining a screw channel therebetween and a plurality of transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising a plurality of transverse splitting webs located in said screw channel intermediate the ends of said flow path, said splitting webs having a height equal to the height of said screw flights, said splitting webs each having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, at least one of said splitting webs being located behind each shearing web relative to the direction of flow.
Claim 11
Dependent Claim
158 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights therein defining a screw channel therebetween and a plurality of transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising a plurality of transverse splitting webs located in said screw channel intermediate the ends of said flow path, said splitting webs having a height equal to the height of said screw flights, said splitting webs each having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, at least one of said splitting webs being located behind each shearing web relative to the direction of flow.
Claim 12
Dependent Claim
19 words
The improved screw conveyor according to claim 9, wherein a radial component for said first shearing gap is 0*.
Claim 13
Dependent Claim
19 words
The improved screw conveyor according to claim 10, wherein said radial component for said second shearing gap is 90*.
Claim 14
Dependent Claim
31 words
The improved screw conveyor according to claim 9, wherein a plurality of transverse splitting webs are located behind one respective group of transverse shearing webs relative to the direction of flow.
Claim 15
Dependent Claim
47 words
The improved screw conveyor according to claim 9, wherein the cross-sectional area between the surface of each transverse shearing web and an inner housing wall defining said first shearing gap substantially coincides with the cross-sectional area of the second shearing gap of the next transverse splitting web.
Claim 16
Dependent Claim
208 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights thereon defining a screw channel therebetween and transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising at least one transverse splitting web located in said screw channel intermediate the ends of said flow path, said splitting web having a height equal to the height of said screw flights, said splitting web having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, said splitting web and said second shearing gap turning a flat laminar flow in said screw channel generated by said first shearing gap by an angle equal to an angular spacing between said first and second shearing gaps and corner angles formed between each transverse splitting web and the adjacent screw flights lying in front in the direction of flow being rounded off or filleted up to the area of the shearing gap.
Claim 17
Dependent Claim
208 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights thereon defining a screw channel therebetween and transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising at least one transverse splitting web located in said screw channel intermediate the ends of said flow path, said splitting web having a height equal to the height of said screw flights, said splitting web having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, said splitting web and said second shearing gap turning a flat laminar flow in said screw channel generated by said first shearing gap by an angle equal to an angular spacing between said first and second shearing gaps and corner angles formed between each transverse splitting web and the adjacent screw flights lying in front in the direction of flow being rounded off or filleted up to the area of the shearing gap.
Claim 18
Dependent Claim
208 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights thereon defining a screw channel therebetween and transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising at least one transverse splitting web located in said screw channel intermediate the ends of said flow path, said splitting web having a height equal to the height of said screw flights, said splitting web having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, said splitting web and said second shearing gap turning a flat laminar flow in said screw channel generated by said first shearing gap by an angle equal to the angular spacing between said first and second shearing gaps and corner angles formed between each transverse splitting web and the adjacent screw flights lying in back in the direction of flow being rounded off or filleted up to the area of the shearing gap.
Claim 19
Dependent Claim
208 words
In a continuously operating screw conveyor for conveying and working flowable compositions along a flow path, comprising housing means, a screw rotatably mounted in said housing and having screw flights thereon defining a screw channel therebetween and transverse shearing webs disposed in said screw channel having a height which is smaller than the height of said screw flights to define a first shearing gap, the improvement comprising at least one transverse splitting web located in said screw channel intermediate the ends of said flow path, said splitting web having a height equal to the height of said screw flights, said splitting web having means defining a second shearing gap therein having at least a radial component relative to the axis of said screw which is different from the radial component of said first shearing gap, said splitting web and said second shearing gap turning a flat laminar flow in said screw channel generated by said first shearing gap by an angle equal to the angular spacing between said first and second shearing gaps and corner angles formed between each transverse splitting web and the adjacent screw flights lying in back in the direction of flow being rounded off or filleted up to the area of the shearing gap.
References Cited (Backward Citations)
US2868517A
Cited
US3687423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |