US3568919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw centrifuge
Assignee: TITAN SEPARATOR
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Filing: 1968-12-24
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Granted: 1971-03-09
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Expires: 1988-12-24
Abstract
Abstract A screw centrifuge comprising inner and outer centrifuge rotors rotating at differential rotational speeds with a screw secured to the outer surface of the inner rotor for conveying separated solid matter. The screw comprises a plurality of axially adjoining sections individually secured to the internal rotor and located angularly with respect to one another to form a substantially continuous helix.
Inventors
- 👤 Torben Boss Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20; B04B3/00; B04B3/04; B04B2001/2033
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A screw centrifuge comprising a hollow internal rotor and an external rotor surrounding said internal rotor and defining therewith a separating chamber, means for rotatably supporting said rotors and means for rotating each of said rotors at mutually different numbers of revolutions per minute, a conveyor screw secured to the outer side of said internal rotor, means for supplying a raw material to be separated into said separating chamber, and means for separately discharging constituents of said raw material from said separating chamber after separation thereof, wherein said conveyor screw comprises a plurality of axially adjoining screw sections, each of said sections being secured individually to said internal rotor, said sections being located angularly with respect to one another.
Claim 2
Dependent Claim
119 words
A screw centrifuge comprising a hollow internal rotor and an external rotor surrounding said internal rotor and defining therewith a separating chamber, means for rotatably supporting said rotors and means for rotating each of said rotors at mutually different numbers of revolutions per minute, a conveyor screw secured to the outer side of said internal rotor, means for supplying a raw material to be separated into said separating chamber, and means for separately discharging constituents of said raw material from said separating chamber after separation thereof, wherein said conveyor screw comprises a plurality of axially adjoining screw sections, each of said sections being secured individually to said internal rotor, said sections being located angularly with respect to one another.
Claim 3
Dependent Claim
17 words
A centrifuge as claimed in claim 1 wherein said screw sections are secured with a shrink fit.
Claim 4
Dependent Claim
55 words
A centrifuge as claimed in claim 1 wherein said screw sections are secured to stepped portions of said internal rotor and angularly located in pairs, the sections of each pair having complementary recesses, and radial pins secured in the wall of said internal rotor and engaging at their outer end in said pair of recesses.
Claim 5
Dependent Claim
16 words
A centrifuge as claimed in claim 3, wherein said pins are threadedly secured in said rotor.
Claim 6
Dependent Claim
37 words
A centrifuge as claimed in claim 1, wherein the leading end of the screw winding of each screw section, as viewed in the conveying direction of said scrEw, is thicker than the trailing end of said winding.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |