US3880761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectangular sieving frame and filter drum provided with a plurality of such sieving frames
Assignee: Machinefabriek W Hubert and Co
•
Filing: 1973-09-12
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Granted: 1975-04-29
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Expires: 1993-09-12
Abstract
Abstract Rectangular sieving frame consisting of a mounting constituted by a beam profile on two opposite sides and at least two thin strips secured to the beam profiles, further consisting of sieving gauze provided with warp threads lying stretched but tensionless between the two beam profiles.
Inventors
- 👤 Anne Jellesma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:06
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/28; B01D33/00; B01D33/06; B01D33/067; B01D33/11; B01D33/44; B01D33/48; B01D33/50; B01D33/70; B01D33/72; B01D2201/00; B01D2201/28; B01D2201/282
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A ROTATABLE FILTER DRUM COMPRISING A HUB, ANNULAR SUPPORTING AND SEALING RIMS SECURED TO AID HUB AND ROTATABLE AROUND A HORIZONTAL CENTER LINE, RECTANGULAR SIEVING FRAMES FOR SAID FILTER DRUM, CONSISTING OF A MOUNTING WITH SIEVING GAUZE, SAID MOUNTING BEING CONSTITUTED BY A BEAM PROFILE ON TWO OPPOSITE SIDES AND BY SOME STRIPS PERPENDICULAR TO SAID PROFILES WHICH BY THEIR ENDS ARE SECURED TO THE BEAM PROFILES, WHILE THE SIEVING GAUZE IS PROVIDED WITH STRETCHED BUT TENSIONLESS WARP THREADS EACH HAVING THEIR OPPOSITE ENDS CONNECTED TO THE TWO BEAM PROFILES AND WEFT THREADS EXTENDING PARALLEL TO SAID PROFILES AND FREE OF SAID MOUNTING, EACH BEAM PROFILE OF SAID SEIVING FRAMES BEING ELASTICALLY CLAMPED IN SUCH A WAY ALONG AN IMAGINARY GENERATRICE OF THE CYLINDRICAL SURFACE OF THE DRUM, THAT THE STRIPS ARE CONVEXLY OUTWARDS CURVED AT A SLIGHT PRE-TENSION TO FORM ARCS OF SMALLER RADIUS THAN SAID DRUM.
Claim 2
Dependent Claim
148 words
A ROTATABLE FILTER DRUM COMPRISING A HUB, ANNULAR SUPPORTING AND SEALING RIMS SECURED TO AID HUB AND ROTATABLE AROUND A HORIZONTAL CENTER LINE, RECTANGULAR SIEVING FRAMES FOR SAID FILTER DRUM, CONSISTING OF A MOUNTING WITH SIEVING GAUZE, SAID MOUNTING BEING CONSTITUTED BY A BEAM PROFILE ON TWO OPPOSITE SIDES AND BY SOME STRIPS PERPENDICULAR TO SAID PROFILES WHICH BY THEIR ENDS ARE SECURED TO THE BEAM PROFILES, WHILE THE SIEVING GAUZE IS PROVIDED WITH STRETCHED BUT TENSIONLESS WARP THREADS EACH HAVING THEIR OPPOSITE ENDS CONNECTED TO THE TWO BEAM PROFILES AND WEFT THREADS EXTENDING PARALLEL TO SAID PROFILES AND FREE OF SAID MOUNTING, EACH BEAM PROFILE OF SAID SEIVING FRAMES BEING ELASTICALLY CLAMPED IN SUCH A WAY ALONG AN IMAGINARY GENERATRICE OF THE CYLINDRICAL SURFACE OF THE DRUM, THAT THE STRIPS ARE CONVEXLY OUTWARDS CURVED AT A SLIGHT PRE-TENSION TO FORM ARCS OF SMALLER RADIUS THAN SAID DRUM.
Claim 3
Dependent Claim
34 words
Sieving frame according to claim 1, in which at least a strip is provided on the two free sides of the sieving gauze, these side strips protruding beyond the edge of the sieving gauze.
Claim 4
Dependent Claim
56 words
Sieving frame according to claim 1 in which each beam profile consists of a doubled metal band, while the edge of the sieving gauze is secured by spotwelding between the parts of the band which are plied on each other, the band being folded in such a manner that it has a substantially L-shaped cross section.
Claim 5
Dependent Claim
45 words
Filter drum according to claim 1 in which the connection between the annular supporting and sealing rims and the rotatable hub consists of radially extending A-shaped spokes having their radially outer apex ends secured to said rims and their inner ends secured to said hub.
References Cited (Backward Citations)
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US2076104A
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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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |