US3637069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw conveyor apparatus
Assignee: Jude Engineering Inc
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Filing: 1969-05-12
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Granted: 1972-01-25
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Expires: 1989-05-12
Abstract
Abstract The invention relates to a screw conveyor apparatus having a support shaft and a screw disposed helically around the support shaft and attached to the shaft at its ends, said screw being spaced from the shaft by a series of lugs that are attached to the screw and are slidable on the shaft and are spaced apart from each other to leave spaces between the screw and the shaft.
Inventors
- 👤 Joseph D Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:50
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/114; B01F27/1145; B01F35/00; B01F35/90; B01F35/95; Y; Y10; Y10S; Y10S198/00; Y10S198/952
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A screw conveyor apparatus having a driven shaft a hollow support shaft that surrounds said driven shaft and is supported on said driven shaft by spacing means, a helical flight disposed about the support shaft, connection means at the ends of said flight securing said flight to said driven shaft only at the ends of said flight, a series of lugs secured to said flight bUt not to said support shaft and spacing said flight from said support shaft, said lugs being spaced apart from each other to leave spaces between the flight and the support shaft, said flight being hollow and being comprised of a first series of plates welded together and recessed to form a hollow space covered by a second series of plates.
Claim 2
Dependent Claim
126 words
A screw conveyor apparatus having a driven shaft a hollow support shaft that surrounds said driven shaft and is supported on said driven shaft by spacing means, a helical flight disposed about the support shaft, connection means at the ends of said flight securing said flight to said driven shaft only at the ends of said flight, a series of lugs secured to said flight bUt not to said support shaft and spacing said flight from said support shaft, said lugs being spaced apart from each other to leave spaces between the flight and the support shaft, said flight being hollow and being comprised of a first series of plates welded together and recessed to form a hollow space covered by a second series of plates.
Claim 3
Dependent Claim
24 words
Apparatus as claimed in claim 1, said first series of plates being spaced from the other by spacing members located in said hollow space.
Claim 4
Dependent Claim
22 words
Apparatus as claimed in claim 1, said second series of plates being also recessed to form a part of said hollow space.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |