US3912622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening machine with lights removal
Assignee: Bird Machine Co Inc
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Filing: 1974-05-30
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Granted: 1975-10-14
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Expires: 1994-05-30
Abstract
Abstract A screening machine is disclosed for separating solid particles in liquid slurry and for separating such particles of low density from the remainder of the slurry, wherein a tubular screen has a rotor therein with a substantially closed surface opposite the screen forming with it a screening zone. Pumping means is provided to recirculate through the interior of the rotor to the inlet to the screening zone reject slurry which has passed through the screening zone. The slurry flows within the rotor interior as a vortex in the inner part of which the low density particles concentrate, and this inner part of the vortex is removed from the machine through an outlet having a mouth extending into the vortex.
Inventors
- 👤 Iii Joseph A Bolton
- 👤 Peter Edmund Leblanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:45
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/12; B03; B03B; B03B7/00; D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; D21D5/026
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
A SCREENING MACHINE FOR SEPARATING SOLID PARTICLES IN LIQUID SLURRY CONTAINING THE SAME AND FOR SEPARATING SUCH PARTICLES OF LOW DENSITY THEREFROM WHICH COMPRISES: A. TUBULAR SCREEN, A ROTOR MOUNTED WITHIN THE SCREEN COAXIALLY THEREOF HAVING A SUBSTANTIALLY CLOSED SURFACE OPPOSITE THE INNER SCREEN SURFACE AND ROTATABLE ABOUT THE SCREEN AXIS TO DEFINE WITH SAID SCREEN SURFACE A SLURRY SCREENING ZONE HAVING AN INLET AND AN OUTLET, AN ACCEPTS COMPARTMENT OPPOSITE THE OUTER SURFACE OF SAID SCREEN, A SLURRY INLET FOR SUPPLYING SLURRY TO BE SCREENED TO SAID SCREENING ZONE INLET, PUMPING MEANS FOR CAUSING SLURRY TO BE RECIRCULATED BY THE ROTATION OF SAID ROTOR FROM THE OUTLET TO THE INLET OF SAID SCREENING ZONE THROUGH THE INTERIOR OF SAID ROTOR AS A VORTEX FLOWING ABOUT THE AXIS OF THE ROTOR TOWARD THE INLET TO SAID SCREENING ZONE, COMPRISING A ROTOR INLET FOR ADMIT-
Claim 2
Dependent Claim
144 words
A SCREENING MACHINE FOR SEPARATING SOLID PARTICLES IN LIQUID SLURRY CONTAINING THE SAME AND FOR SEPARATING SUCH PARTICLES OF LOW DENSITY THEREFROM WHICH COMPRISES: A. TUBULAR SCREEN, A ROTOR MOUNTED WITHIN THE SCREEN COAXIALLY THEREOF HAVING A SUBSTANTIALLY CLOSED SURFACE OPPOSITE THE INNER SCREEN SURFACE AND ROTATABLE ABOUT THE SCREEN AXIS TO DEFINE WITH SAID SCREEN SURFACE A SLURRY SCREENING ZONE HAVING AN INLET AND AN OUTLET, AN ACCEPTS COMPARTMENT OPPOSITE THE OUTER SURFACE OF SAID SCREEN, A SLURRY INLET FOR SUPPLYING SLURRY TO BE SCREENED TO SAID SCREENING ZONE INLET, PUMPING MEANS FOR CAUSING SLURRY TO BE RECIRCULATED BY THE ROTATION OF SAID ROTOR FROM THE OUTLET TO THE INLET OF SAID SCREENING ZONE THROUGH THE INTERIOR OF SAID ROTOR AS A VORTEX FLOWING ABOUT THE AXIS OF THE ROTOR TOWARD THE INLET TO SAID SCREENING ZONE, COMPRISING A ROTOR INLET FOR ADMIT-
Claim 3
Dependent Claim
28 words
A screening machine according to claim 1 which includes a reject outlet for removing from the machine a portion of the slurry passing through said screening zone outlet.
Claim 4
Dependent Claim
26 words
A screening machine according to claim 1 wherein said rotor outlet has a frusto-conical end portion enlarging outwardly from the rotor axis toward its discharge end.
Claim 5
Dependent Claim
25 words
A screening machine according to claim 1 wherrein the surface of said rotor facing said screen comprising lobes eccentric to the axis of said rotor.
Claim 6
Dependent Claim
19 words
A screening machine according to claim 4 wherein the surface of said rotor facing said screen comprises defibering projections.
Claim 7
Dependent Claim
22 words
A screening machine according to claim 1 wherein the surface of said rotor facing said screen comprises a plurality of spaced bumps.
Claim 8
Dependent Claim
22 words
A screening machine according to claim 1 wherein said rotor inlet is positioned closer to the rotor axis than said rotor outlet.
Claim 9
Dependent Claim
22 words
A screening machine according to claim 1 wherein said inlet end of said discharge means is annular and coaxial with said rotor.
Claim 10
Dependent Claim
25 words
A screening machine according to claim 8 wherein said inlet end of said discharge means is frusto-conical and convergent in the direction of flow therethrough.
Claim 11
Dependent Claim
44 words
A screening machine according to claim 9 wherein said inlet end of said discharge means is surrounded by a cylindrical-baffle defining with the inner wall of said rotor an annular passage for flow of the outer portion of said vortex toward said rotor outlet.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |