US4374729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strainer drum for pulp and the like
Assignee: Celleco AB
•
Filing: 1981-01-26
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Granted: 1983-02-22
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Expires: 2001-01-26
Abstract
Abstract A strainer drum for straining pulp and the like comprises a substantially circular cylindrical mantle formed by a number of strainer elements provided with strainer openings, which strainer elements are held together between at least two gables to form the mantle.
Inventors
- 👤 Rune H. Frykhult
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:48
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; D; D21; D21D; D21D5/00; D21D5/02; D21D5/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A strainer drum for straining pulp and the like, comprising a substantially circular cylindrical mantle having a longitudinal axis and formed by strainer elements provided with strainer openings, a pair of gables forming opposite ends of the drum and between which the strainer elements are held together to form said mantle, said elements having inter-abutting edges to form a circular series of said elements as viewed in a plane transverse to said axis, there being a plurality of said circular series interposed between said gables, first means releasably interlocking said abutting edges in each circular series to prevent radial movement of said elements, each pair of adjacent circular series having interengaging surfaces, and second means releasably interlocking said interengaging surfaces to interconnect the strainer elements of each circular series in said adjacent pair.
Claim 2
Dependent Claim
133 words
A strainer drum for straining pulp and the like, comprising a substantially circular cylindrical mantle having a longitudinal axis and formed by strainer elements provided with strainer openings, a pair of gables forming opposite ends of the drum and between which the strainer elements are held together to form said mantle, said elements having inter-abutting edges to form a circular series of said elements as viewed in a plane transverse to said axis, there being a plurality of said circular series interposed between said gables, first means releasably interlocking said abutting edges in each circular series to prevent radial movement of said elements, each pair of adjacent circular series having interengaging surfaces, and second means releasably interlocking said interengaging surfaces to interconnect the strainer elements of each circular series in said adjacent pair.
Claim 3
Dependent Claim
23 words
The strainer drum of claim 1, in which the strainer elements have peripheral reinforcements protruding inwardly toward the longitudinal axis of the drum.
Claim 4
Dependent Claim
19 words
The strainer drum of claim 1, in which the strainer elements have peripheral reinforcements protruding outwardly from the drum.
Claim 5
Dependent Claim
32 words
The strainer drum of claim 1, in which said first interlocking means include a protrusion located on one of said abutting edges and received in a recess in the other abutting edge.
Claim 6
Dependent Claim
36 words
The strainer drum of claim 1, in which said second interlocking means include a ring located in a recess in each of said interengaging surfaces, said ring lying in a plane transverse to said longitudinal axis.
Claim 7
Dependent Claim
31 words
The strainer drum of claim 1, in which said second interlocking means include a protrusion on one of said interengaging surfaces and located in a recess in the other interengaging surface.
Claim 8
Dependent Claim
17 words
The strainer of claim 1, in which said gables constitute the sole support for the strainer elements.
References Cited (Backward Citations)
US2669910A
Cited
US3681239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |