Patent US5041214A successfully refreshed from Google Patents.
US5041214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave screen plate
Assignee: Beloit Technologies Inc
•
Filing: 1990-04-16
•
Granted: 1991-08-20
•
Expires: 2010-04-16
Abstract
Abstract A paper pulp screening apparatus wherein a modular cylindrically-shaped screen plate is formed of a thin material of uniform thickness bent to form an undulating shape to increase the screening area, and the screen plate is supported by cylindrical-backing members to give the plate strength, with the plate being formed into various complex shapes. Manufacturing methods for forming the undulating shapes are disclosed.
Inventors
- 👤 William Gero
- 👤 Frank Paskowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:22
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
158 words
A screen plate module for use in a pressure screening apparatus in which stock to be screened is introduced under pressure on one side of the screen plate assembly, with some of said stock flowing through said screen plate to the opposite side thereof, said screen plate module comprising: first and second shaped screen plate sections being cylindrically shaped from relatively thin material formed in an undulating pattern, said plate sections having inlet sides on which stock to be screened is introduced; an annular central support member disposed between said screen plate sections, said central support member including means for releasably retaining ends of the screen sections in fixed relative locations; first and second annular end support members having means for releasably retaining edges of said screen sections opposite the ends retained by the central support member; and tieing means disposed between said support members, for releasably securing the positions of said support members relative to each other.
Claim 2
Dependent Claim
158 words
A screen plate module for use in a pressure screening apparatus in which stock to be screened is introduced under pressure on one side of the screen plate assembly, with some of said stock flowing through said screen plate to the opposite side thereof, said screen plate module comprising: first and second shaped screen plate sections being cylindrically shaped from relatively thin material formed in an undulating pattern, said plate sections having inlet sides on which stock to be screened is introduced; an annular central support member disposed between said screen plate sections, said central support member including means for releasably retaining ends of the screen sections in fixed relative locations; first and second annular end support members having means for releasably retaining edges of said screen sections opposite the ends retained by the central support member; and tieing means disposed between said support members, for releasably securing the positions of said support members relative to each other.
Claim 3
Dependent Claim
39 words
A screen plate module as defined in claim 1, in which said central support member and said first and second end members include grooves having openings therein, for receiving edges of said first and second shaped screen plate sections.
Claim 4
Dependent Claim
19 words
A screen plate module as defined in claim 1, in which said screen plate sections include holes extending therethrough.
Claim 5
Dependent Claim
19 words
A screen plate module as defined in claim 1, in which said screen plate sections include slots extending therethrough.
Claim 6
Dependent Claim
16 words
A screen plate module as defined in claim 4, in which said slots have louvered openings.
Claim 7
Dependent Claim
20 words
A screen plate module as defined in claim 1, in which undulations of said screen plate sections are generally V-shaped.
Claim 8
Dependent Claim
22 words
A screen plate module as defined in claim 6, in which said generally V-shaped undulations include one longer and one shorter segment.
Claim 9
Dependent Claim
20 words
A screen plate module as defined in claim 1, in which undulations of said screen plate sections are generally U-shaped.
Claim 10
Dependent Claim
20 words
A screen plate module as defined in claim 1, in which said screen plate sections include zig-zag slots extending therethrough.
Claim 11
Dependent Claim
26 words
A screen plate module as defined in claim 1, in which said screen plate sections include openings therethrough having both generally circular and generally linear portions.
Claim 12
Dependent Claim
29 words
A screen plate module as defined in claim 10, in which an arcuately shaped tail slot portion is contiguous with said linear portion and opposite from said circular portion.
Claim 13
Dependent Claim
124 words
In a pressure pulp screen of the type in which a cylindrical screen basket is mounted within a pressure containing housing, and a rotor is disposed for operation in proximity with said basket, said basket having openings therethrough for separating contaminants from a slurry of pulp, the improvement comprising: said basket including a plurality of separately replaceable screen sections, each section being cylindrically shaped from thin, sheet-like, relatively flexible material formed into an undulating pattern; and means for rigidifying and strengthening said basket to withstand internal screen pressures, said means including annular retaining rings at each end of each screen section, said retaining rings being adapted for releasably securing end portions of said screen sections, and tie rods extending between adjacent annular retaining rings.
Claim 14
Dependent Claim
124 words
In a pressure pulp screen of the type in which a cylindrical screen basket is mounted within a pressure containing housing, and a rotor is disposed for operation in proximity with said basket, said basket having openings therethrough for separating contaminants from a slurry of pulp, the improvement comprising: said basket including a plurality of separately replaceable screen sections, each section being cylindrically shaped from thin, sheet-like, relatively flexible material formed into an undulating pattern; and means for rigidifying and strengthening said basket to withstand internal screen pressures, said means including annular retaining rings at each end of each screen section, said retaining rings being adapted for releasably securing end portions of said screen sections, and tie rods extending between adjacent annular retaining rings.
References Cited (Backward Citations)
DE25742C
Cited
DE39216C
Cited
US520571A
Cited
US1082855A
Cited
DE561779C
Cited
US2246669A
Cited
GB519680A
Cited
US2311813A
Cited
US2617600A
Cited
US2913114A
Cited
US2827169A
Cited
US3339731A
Cited
US3581893A
Cited
US3928188A
Cited
US4202759A
Cited
DD148308A1
Cited
SU1360820A1
Cited
GB2195911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |