US4201481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scrolls for extruding machines
Assignee: Iddon Brothers Ltd
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Filing: 1978-10-11
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Granted: 1980-05-06
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Expires: 1998-10-11
Abstract
Abstract A rotatable scroll for a rubber extruding machine comprising a series of vanes in the base of channels in the scroll to redirect the material into a surface layer and to direct lumps of material to one edge of the channel and a ramp or ramps over which the lumps flow with a small clearance between the ramp and the barrel.
Inventors
- 👤 Michael I. Iddon
- 👤 Donald M. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:46
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/64; B29C48/65; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29B7/428; B29B7/429; B29C48/62; B29C48/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A rotatable scroll for an extruding machine comprising a barrel, a helix mounted to rotate in the barrel, channels formed in the helix, a series of vanes in the base of the channels to redirect the material into a surface layer and to direct lumps of material to one edge of the channel and a ramp over which the lumps flow with a small clearance between the ramp and the barrel.
Claim 2
Dependent Claim
71 words
A rotatable scroll for an extruding machine comprising a barrel, a helix mounted to rotate in the barrel, channels formed in the helix, a series of vanes in the base of the channels to redirect the material into a surface layer and to direct lumps of material to one edge of the channel and a ramp over which the lumps flow with a small clearance between the ramp and the barrel.
Claim 3
Dependent Claim
29 words
A rotatable scroll as in claim 1 in which the scroll is composed of four zones, a feed zone, a compaction zone, a blending zone and a delivery zone.
Claim 4
Dependent Claim
22 words
A scroll as in claim 1 in which the height of the vanes is between 30%-100% of the depth of the channels.
Claim 5
Dependent Claim
35 words
A scroll as in claim 1 in which the series of vanes in each zone provide a plurality of routes for the material through the channels so that the streams are continually divided and recombined.
Claim 6
Dependent Claim
113 words
A rotatable scroll for an extruding machine comprising a series of helical flights extending through four zones, a feed zone, a compaction zone, a blending zone and a delivery zone, channels between the flights, a series of angled vanes of less height than the flights in the base of the channels to provide a plurality of routes for the material through the channels and to ensure that any material occupying the centre of a channel is re-directed into a surface layer to provide a highly homogeneous material when reaching the delivery zone and ramps over which the material in the surface layer is forced to flow as it passes from zone to zone.
Claim 7
Dependent Claim
113 words
A rotatable scroll for an extruding machine comprising a series of helical flights extending through four zones, a feed zone, a compaction zone, a blending zone and a delivery zone, channels between the flights, a series of angled vanes of less height than the flights in the base of the channels to provide a plurality of routes for the material through the channels and to ensure that any material occupying the centre of a channel is re-directed into a surface layer to provide a highly homogeneous material when reaching the delivery zone and ramps over which the material in the surface layer is forced to flow as it passes from zone to zone.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |