US4419014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder mixer
Assignee: Rubber and Plastics Research Association of Great Britain
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Filing: 1981-03-31
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Granted: 1983-12-06
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Expires: 2001-03-31
Abstract
Abstract An extruder mixer for the extrusion of molten plastics and rubbers. The apparatus comprises a hollow cylindrical stator member and a cylindrical rotor member rotatable within the stator. The facing cylindrical surfaces carry rows of hemispherical cavities extending peripherally around the members so that the rows of one member are axially offset from rows of the other member whereby there is an axial overlap of the cavities and rotor. The cavities in adjacent rows on the rotor and stator are also circumferentially offset.
Inventors
- 👤 George M. Gale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:52
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/27; B01F27/272; B01F27/2722; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/402; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/465; B29C48/467; B29C48/468; B01F25/00; B01F2025/91; B01F2025/911; B29B7/42; B29B7/422; B29C48/03
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
In an extruder mixer of the type comprising a hollow cylindrical stator member and a cylindrical rotor member which is rotatable within the stator and wherein the facing cylindrical surfaces of the rotor and stator carry respective pluralities of rows of recesses, with the rows on each member extending peripherally around the member and being spaced apart axially so that the rows on one member are axially offset from the rows on the other member whereby there is axial overlap of the recesses in adjacent rows on the stator and rotor, the improvement wherein the rotor and stator recesses are in the form of hemispherical cavities, the hemispherical cavities being disposed with: (1) the cavities in adjacent rows on the stator circumferentially offset; (2) the cavities in adjacent rows on the rotor circumferentially offset; and (3) the rows of cavities on the stator and rotor axially offset.
Claim 2
Dependent Claim
147 words
In an extruder mixer of the type comprising a hollow cylindrical stator member and a cylindrical rotor member which is rotatable within the stator and wherein the facing cylindrical surfaces of the rotor and stator carry respective pluralities of rows of recesses, with the rows on each member extending peripherally around the member and being spaced apart axially so that the rows on one member are axially offset from the rows on the other member whereby there is axial overlap of the recesses in adjacent rows on the stator and rotor, the improvement wherein the rotor and stator recesses are in the form of hemispherical cavities, the hemispherical cavities being disposed with: (1) the cavities in adjacent rows on the stator circumferentially offset; (2) the cavities in adjacent rows on the rotor circumferentially offset; and (3) the rows of cavities on the stator and rotor axially offset.
Claim 3
Dependent Claim
81 words
An extruder mixer comprising a hollow cylindrical stator member, a cylindrical rotor member, means journalling the rotor for rotation within the stator, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel rows of hemispherical cavities, the hemispherical cavities being disposed with: (1) the cavities in adjacent rows on the stator circumferentially offset; (2) the cavities in adjacent rows on the rotor circumferentially offset; and (3) the rows of cavities on the stator and rotor axially offset.
Claim 4
Dependent Claim
81 words
An extruder mixer comprising a hollow cylindrical stator member, a cylindrical rotor member, means journalling the rotor for rotation within the stator, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel rows of hemispherical cavities, the hemispherical cavities being disposed with: (1) the cavities in adjacent rows on the stator circumferentially offset; (2) the cavities in adjacent rows on the rotor circumferentially offset; and (3) the rows of cavities on the stator and rotor axially offset.
Claim 5
Dependent Claim
43 words
An extruder mixer according to claim 2 wherein in the case of both the stator and the rotor, the circumferential offset between the cavities in adjacent rows is equal to half the circumferential distance between the centres of adjacent cavities in a row.
Claim 6
Dependent Claim
28 words
An extruder mixer according to claim 3 wherein the axial offset of the stator and rotor rows is equal to half the axial spacing between adjacent rotor rows.
Claim 7
Dependent Claim
72 words
An extruder mixer comprising a hollow cylindrical stator member, a cylindrical rotor member, means journalling the rotor for rotation within the stator, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel rows of hemispherical cavities, the rows of hemispherical cavities on the rotor and stator being axially offset and the hemispherical cavities in each pair of adjacent rows on both the rotor and stator being circumferentially offset.
Claim 8
Dependent Claim
72 words
An extruder mixer comprising a hollow cylindrical stator member, a cylindrical rotor member, means journalling the rotor for rotation within the stator, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel rows of hemispherical cavities, the rows of hemispherical cavities on the rotor and stator being axially offset and the hemispherical cavities in each pair of adjacent rows on both the rotor and stator being circumferentially offset.
Claim 9
Dependent Claim
61 words
An extruder mixer according to claim 5 wherein the circumferential offset corresponds to half the centre spacing between adjacent cavities in a row and the axial offset is such that the adjacent edges of the cavity mouths in each pair of adjacent rows on the stator/rotor lie on the centre line of the cavities in a row on the rotor/stator, respectively.
Claim 10
Dependent Claim
142 words
In an extruder mixer of the type comprising a hollow cylindrical stator member and a cylindrical rotor member which is rotatable within the stator, and wherein the facing cylindrical surfaces of the rotor and stator carry respective pluralities of rows of recesses, with the rows on each member extending peripherally around the member and being spaced apart axially so that the rows on one member are axially offset from the rows on the other member whereby there is axial overlap of the recesses in adjacent rows on the stator and rotor, the improvement wherein the rotor and stator recesses have circular mouths, the recesses being disposed with: (1) the recesses in adjacent rows on the stator circumferentially offset; (2) the recesses in adjacent rows on the rotor circumferentially offset; and (3) the rows of recesses on the stator and rotor axially offset.
Claim 11
Dependent Claim
142 words
In an extruder mixer of the type comprising a hollow cylindrical stator member and a cylindrical rotor member which is rotatable within the stator, and wherein the facing cylindrical surfaces of the rotor and stator carry respective pluralities of rows of recesses, with the rows on each member extending peripherally around the member and being spaced apart axially so that the rows on one member are axially offset from the rows on the other member whereby there is axial overlap of the recesses in adjacent rows on the stator and rotor, the improvement wherein the rotor and stator recesses have circular mouths, the recesses being disposed with: (1) the recesses in adjacent rows on the stator circumferentially offset; (2) the recesses in adjacent rows on the rotor circumferentially offset; and (3) the rows of recesses on the stator and rotor axially offset.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |