US3726401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening machine
Assignee: Bird Machine Co Inc
•
Filing: 1970-12-16
•
Granted: 1973-04-10
•
Expires: 1990-12-16
Abstract
Abstract A screening machine is disclosed for separating solid particles in liquid slurry stock wherein a substantially closed surface rotor opposite a screen forms therewith a screening zone and is utilized as a pumping means for recirculating to the inlet to the screening zone rejected stock which has passed through the screening zone. Detrimental thickening of such rejected stock is thereby avoided and the recovery of acceptable particles through the screen is increased.
Inventors
- 👤 J Bolton
- 👤 Blanc P Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:24
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; D21D5/026; B; B03; B03B; B03B7/00; B07; B07B; B07B1/00; B07B2230/00; B07B2230/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A screening machine for separating solid particles in liquid slurry stock containing the same 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 stock screening zone having an inlet and an outlet; an accepts compartment opposite the outer surface of said screen; a stock inlet for supplying stock to be screened to said screening zone inlet; a rejects outlet for removing from the machine stock passing through said screening zone outlet; and pumping means operable by the rotational force applied to said rotor to recirculate stock from the vicinity of said screening zone outlet through the interior of said rotor to the vicinity of said screening zone inlet.
Claim 2
Dependent Claim
135 words
A screening machine for separating solid particles in liquid slurry stock containing the same 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 stock screening zone having an inlet and an outlet; an accepts compartment opposite the outer surface of said screen; a stock inlet for supplying stock to be screened to said screening zone inlet; a rejects outlet for removing from the machine stock passing through said screening zone outlet; and pumping means operable by the rotational force applied to said rotor to recirculate stock from the vicinity of said screening zone outlet through the interior of said rotor to the vicinity of said screening zone inlet.
Claim 3
Dependent Claim
64 words
A screening machine according to claim 1 wherein said pumping means comprises a rotor inlet for admitting stock into said rotor in the vicinity of said screening zone outlet and a rotor outlet for discharging stock from said rotor to the vicinity of said screening zone inlet, said rotor inlet being closer to the axis of rotation of said rotor than said rotor outlet.
Claim 4
Dependent Claim
27 words
A screening machine according to claim 2 wherein said rotor inlet comprises at least one opening through an end wall of said rotor adjacent said rejects zone.
Claim 5
Dependent Claim
28 words
A screening machine according to claim 2 wherein said rotor outlet comprises at least one opening through an end wall of said rotor adjacent said screening zone inlet.
Claim 6
Dependent Claim
28 words
A screening machine according to claim 2 wherein said rotor outlet comprises at least one opening through the side wall of said rotor adjacent said screening zone inlet.
Claim 7
Dependent Claim
24 words
A screening machine according to claim 1 wherein the surface of said rotor facing said screen comprises lobes eccentric to the axis of rotation.
Claim 8
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 9
Dependent Claim
20 words
A screening machine according to claim 1 which includes time controlled means for intermittently removing stock from said rejects 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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |