US3640476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stirring mill
Assignee: Draiswerke GmbH
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Filing: 1970-01-13
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Granted: 1972-02-08
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Expires: 1990-01-13
Abstract
Abstract Stirring mill for homogenizing, dispersing and comminuting solids in liquids comprising an upright milling container or housing filled with grinding bodies 0.2 to 3 mm. in size in which a rapidly rotating stirring device is arranged and the material being ground is forced into the container from the bottom and leaves it by way of a separating device through the upper end, where the material being ground accumulates in a back pressure chamber defined by a cylindrical screen and a top element, where the outlet is above the cylindrical screen and the shaft of the stirring device is devoid of stirring elements in the area of the back pressure chamber and guide members are provided in the back pressure chamber which delay the movement of the grinding bodies and material being ground.
Inventors
- 👤 Kaspar Engels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:01
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16; B01; B01F; B01F27/00; B01F27/80; B01F27/93; B01F27/05; B01F27/11; B01F27/19; B01F27/191
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
Stirring mill for homogenizing, dispersing and comminuting solid substances in liquids, comprising an upright grinding container in which material to be ground is forced in through the bottom and leaves through a separating arrangement at the upper end, grinding bodies between 0.2 to 3 mm. in size disposed in said container, a rapidly running stirring mechanism arranged in said container, a cylindrical screen disposed at the upper end of said container and a top container structure superimposed on said container around said screen defining a back pressure chamber with said screen, an outlet arranged in said top structure above the upper end of said screen, where material being ground accumulates in said back pressure chamber prior to discharge through said outlet, said stirring mechanism having a shaft devoid of stirring arms in the area of said back pressure chamber, and stationary guiding elements extending in said back pressure chamber for delaying the movement of said grinding bodies and of material being ground.
Claim 2
Dependent Claim
162 words
Stirring mill for homogenizing, dispersing and comminuting solid substances in liquids, comprising an upright grinding container in which material to be ground is forced in through the bottom and leaves through a separating arrangement at the upper end, grinding bodies between 0.2 to 3 mm. in size disposed in said container, a rapidly running stirring mechanism arranged in said container, a cylindrical screen disposed at the upper end of said container and a top container structure superimposed on said container around said screen defining a back pressure chamber with said screen, an outlet arranged in said top structure above the upper end of said screen, where material being ground accumulates in said back pressure chamber prior to discharge through said outlet, said stirring mechanism having a shaft devoid of stirring arms in the area of said back pressure chamber, and stationary guiding elements extending in said back pressure chamber for delaying the movement of said grinding bodies and of material being ground.
Claim 3
Dependent Claim
25 words
Stirring mill in accordance with claim 1, where said guiding elements are paddles extending tangentially to said shaft as seen in the direction of rotation.
Claim 4
Dependent Claim
20 words
Stirring mill in accordance with claim 1, where said guiding elements are in the form of helically shaped guiding paddles.
Claim 5
Dependent Claim
33 words
Stirring mill in accordance with claim 1, where said guiding elements are spaced from said shaft by a distance corresponding to at least one to two times the size of said grinding bodies.
Claim 6
Dependent Claim
36 words
Stirring mill in accordance with claim 1, where said guiding elements and said cylindrical screen define a gap therebetween of a size corresponding to at least one to two times the size of said grinding bodies.
Claim 7
Dependent Claim
24 words
Stirring mill in accordance with claim 1, where the axial length of said guiding elements corresponds substantially to the height of said cylindrical screen.
Claim 8
Dependent Claim
39 words
Stirring mill in accordance with claim 1, where the distance of said guiding elements from said cylindrical screen decreases upwardly and remains substantially the same in the area of the upper one-third of the height of the guiding elements.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |