US3780957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen arrangement for stirring mills
Assignee: Draiswerke GmbH
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Filing: 1971-07-19
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Granted: 1973-12-25
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Expires: 1991-07-19
Abstract
Abstract A closed stirring mill for processing solid materials in liquids having a stirrer and a plurality of spherical grinding elements and a screen arrangement at the ground material outlet to hold back the grinding elements wherein the screen arrangement consists of one or more screen cartridges attached to the jacket wall or the cover plate of the mill.
Inventors
- 👤 K Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:58
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16; B02C17/161
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
In a closed stirring mill for processing solid materials in liquids with a vertical mill housing having a jacket wall and a cover plate with an aperture therein, and a stirrer driven by a drive shaft, said drive shaft extending through said aperture, and said mill housing having material inlet and outlet openings thereon and spherical grinding elements therein, wherein a disperse flow of ground material is produced in the presence of said spherical grinding elements by high-speed stirring and in which a screen arrangement is provided at said material outlet to hold back the said grinding elements, the improvement wherein said screen arrangement comprises at least one cartridge having a cylindrical screen and having an open end, said cartridge extending into the internal space of said mill housing and being connected at the open end thereof to said material outlet wherein substantially the entire surface of the cartridge is exposeD to the flow of the material being ground.
Claim 2
Dependent Claim
159 words
In a closed stirring mill for processing solid materials in liquids with a vertical mill housing having a jacket wall and a cover plate with an aperture therein, and a stirrer driven by a drive shaft, said drive shaft extending through said aperture, and said mill housing having material inlet and outlet openings thereon and spherical grinding elements therein, wherein a disperse flow of ground material is produced in the presence of said spherical grinding elements by high-speed stirring and in which a screen arrangement is provided at said material outlet to hold back the said grinding elements, the improvement wherein said screen arrangement comprises at least one cartridge having a cylindrical screen and having an open end, said cartridge extending into the internal space of said mill housing and being connected at the open end thereof to said material outlet wherein substantially the entire surface of the cartridge is exposeD to the flow of the material being ground.
Claim 3
Dependent Claim
34 words
A stirring mill according to claim 1, wherein the said screen cartridges are installed at said ground material outlet of said mill housing through suitable openings in said jacket wall of said mill housing.
Claim 4
Dependent Claim
24 words
A stirring mill according to claim 2, wherein one screen cartridge is mounted laterally on each side of said drive shaft of said stirrer.
Claim 5
Dependent Claim
21 words
A stirring mill according to claim 3, wherein one screen cartridge is mounted perpendicularly to said drive shaft of said stirrer.
Claim 6
Dependent Claim
31 words
A stirring mill according to claim 1, wherein said screen cartridges are mounted parallel to said drive shaft of said stirrer in openings in said cover plate of said stirring mill.
Claim 7
Dependent Claim
38 words
A stirring mill according to claim 5 further including a collecting chamber linked to said material outlet to carry off the disperse ground material from the stirring mill, wherein said screen cartridges are connected to said collecting chamber.
Claim 8
Dependent Claim
52 words
A stirring mill according to claim 6, wherein said screen cartridges further include edge flanges at the open end thereof, and further including screw caps for fastening said edge flanges to said cover plate, wherein said screw caps have hollow spaces therein connected by way of radial channels to said collecting chamber.
Claim 9
Dependent Claim
45 words
In a stirring mill according to claim 1 further including a drive means attached to said drive shaft and located above said cover plate for driving said drive shaft, the improvement further comprising a flexible rubber ring between said cover plate and said jacket wall.
Claim 10
Dependent Claim
19 words
A stirring mill according to claim 1 wherein said outlet opening is located near the top of said housing.
Claim 11
Dependent Claim
44 words
A stirring mill in accordance with claim 1 wherein the cylindrical wall of said cartridges is made of a fine-mesh metal braid or perforated thin sheet and wherein the end opposite the open end thereof is made of the same material or of sheet.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |