US3755072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strainer device for cellulose digester
Assignee: Metso Fiber Karlstad AB
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Filing: 1970-10-23
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Granted: 1973-08-28
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Expires: 1990-10-23
Abstract
Abstract A strainer device for separating liquid from a suspension of fibrous material in a cellulose digester. The strainer plate consists of flat annular members separated by concentric slots. Rhombic shaped cleaning members attached to a rotary shaft move in the slots to keep them open and push back particles tending to clog them.
Inventors
- 👤 B Ostberg
- 👤 G Ortqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:40
CPC Classifications
D; D21; D21C; D21C7/00; D21C7/08; B; B01; B01D; B01D29/00; B01D29/01; B01D29/62; B01D29/66; B01D35/00; B01D35/28; D21D; D21D5/00; D21D5/02; D21D5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A strainer device adapted for insertion in a shell portion of a cellulose digester, comprising: a plane circular strainer plate having a plurality of annular rings forming there between continuous concentric circular slots; rotary cleaning members continuously movable in each of said slots in one and the same direction, said rotary cleaning members have a substantially rhombic shape with one corner beveled, said beveled corner extending a relatively short distance through the slots past the front of said circular strainer plate, and said ribs having slots therein for providing clearance for the extending beveled corner; operating means including a rotary shaft located in a filtrate collection chamber rearward of the strainer plate, said strainer plate on its front side facing inwardly of the digester; and parallel ribs extending across the front of said strainer plate for maintaining connections between the annular rings of the strainer plate.
Claim 2
Dependent Claim
146 words
A strainer device adapted for insertion in a shell portion of a cellulose digester, comprising: a plane circular strainer plate having a plurality of annular rings forming there between continuous concentric circular slots; rotary cleaning members continuously movable in each of said slots in one and the same direction, said rotary cleaning members have a substantially rhombic shape with one corner beveled, said beveled corner extending a relatively short distance through the slots past the front of said circular strainer plate, and said ribs having slots therein for providing clearance for the extending beveled corner; operating means including a rotary shaft located in a filtrate collection chamber rearward of the strainer plate, said strainer plate on its front side facing inwardly of the digester; and parallel ribs extending across the front of said strainer plate for maintaining connections between the annular rings of the strainer plate.
Claim 3
Dependent Claim
32 words
The strainer device as claimed in claim 1, in which the cleaning members project through the strainer slots and are formed with inclined faces for pushing back particles stuck in said slots.
Claim 4
Dependent Claim
76 words
The strainer device of claim 1 wherein said cleaner members have an incline away from the direction of motion so as to drive any solid particles stuck between any two adjacent rings out the front face of said strainer back into the digester and said cleaner members have a tapered shape in the direction of the slots which in turn have a similar taper broader from the inner face to the outer face of said strainer.
Claim 5
Dependent Claim
31 words
The strainer as claimed in claim 1 wherein said ribs have a substantially trapezoidal shape, the shorter base thereof extending into the digester and away from the front of the plate.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |