US4529519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen cage for separators for sorting fibre suspensions
Assignee: Voith Finckh Fiber Systems GmbH and Co KG
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Filing: 1983-04-26
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Granted: 1985-07-16
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Expires: 2003-04-26
Abstract
Abstract Screen cage for pressure sorters, with which, in order to increase the stability of the screen cage wall and the sum total of the inside screen cage apertures, the screen cage wall has a regular pattern of cylindrical recesses on its outlet side and grooves extending parallel to each other on its inflow side, the grooves and the recesses together forming screen aperture slots.
Inventors
- 👤 Emil Holz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:20
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
137 words
A screen cage for separators for sorting fibre suspensions comprising a unitary screen cage wall which has an inflow side, an outlet side and a plurality of screen apertures which are provided by slots extending along the inflow side and penetrate from this side into the screen cage wall, said screen cage wall also having recesses penetrating from the outlet side into the screen cage wall, each recess extending over a plurality of screen aperture slots and the recesses being spaced from each other in all directions such that the screen cage wall on the outlet side has a net structure between the recesses, the depth of said recesses plus the depth of said slots being equal to the thickness of the screen cage wall in the areas where the recesses extend over the screen aperture slots.
Claim 2
Dependent Claim
137 words
A screen cage for separators for sorting fibre suspensions comprising a unitary screen cage wall which has an inflow side, an outlet side and a plurality of screen apertures which are provided by slots extending along the inflow side and penetrate from this side into the screen cage wall, said screen cage wall also having recesses penetrating from the outlet side into the screen cage wall, each recess extending over a plurality of screen aperture slots and the recesses being spaced from each other in all directions such that the screen cage wall on the outlet side has a net structure between the recesses, the depth of said recesses plus the depth of said slots being equal to the thickness of the screen cage wall in the areas where the recesses extend over the screen aperture slots.
Claim 3
Dependent Claim
17 words
A screen cage according to claim 1 wherein the recesses form a regular pattern in all directions.
Claim 4
Dependent Claim
26 words
A screen cage according to claim 1 wherein the thickness of the screen cage wall remaining at the base of the recesses is approximately 1 mm.
Claim 5
Dependent Claim
31 words
A screen cage according to claim 1 wherein the thickness of the screen cage wall remaining at the base of the recesses is between approximately 0.8 mm and approximately 1.2 mm.
Claim 6
Dependent Claim
29 words
A screen cage according to claim 1 wherein the screen aperture slots on the inflow side of the screen cage wall do not extend over more than one recess.
Claim 7
Dependent Claim
14 words
A screen cage according to claim 1 wherein the recesses are cylindrical in shape.
Claim 8
Dependent Claim
17 words
A screen cage according to claim 6 wherein the recesses form a regular pattern in all directions.
Claim 9
Dependent Claim
27 words
A screen cage according to claim 7 wherein when the screen cage wall is laid flat, the centers of the recesses form the corners of equilateral triangles.
Claim 10
Dependent Claim
28 words
A screen cage according to claim 1 wherein the screen cage wall on the inflow side has grooves running parallel to each other and extending over several recesses.
Claim 11
Dependent Claim
26 words
A screen cage according to claim 9 wherein the grooves extend in the circumferential direction of the screen cage, each groove being a complete annular groove.
Claim 12
Dependent Claim
18 words
a screen cage according to claim 9 wherein the grooves are disposed at equal distances from each other.
Claim 13
Dependent Claim
22 words
A screen cage according to claim 9 wherein the depth of the grooves is between approximately 0.9 mm and approximately 1.3 mm.
Claim 14
Dependent Claim
22 words
A screen cage according to claim 9 wherein the grooves extend at least approximately in the direction of the screen cage axis.
Claim 15
Dependent Claim
21 words
A screen cage according to claim 13 wherein the grooves end at a distance from the ends of the screen cage.
Claim 16
Dependent Claim
17 words
A screen cage according to claim 9 wherein the depth of the grooves is approximately 1 mm.
Claim 17
Dependent Claim
26 words
A screen cage according to claim 15 wherein the thickness of the screen cage wall remaining at the base of the recesses is approximately 1 mm.
Claim 18
Dependent Claim
31 words
A screen cage according to claim 16 wherein the depth of the grooves is slightly greater than the thickness of the screen cage wall remaining at the base of the recesses.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |