US3993243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge drum and method of making such centrifuge drum
Assignee: BMA Braunschweigische Maschinenbauanstalt AG
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Filing: 1975-03-25
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Granted: 1976-11-23
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Expires: 1995-03-25
Abstract
Abstract A drum for a centrifuge has a shell with a radially outer layer of plastic resin free of fibrous material, a radially inner layer of a fine mesh metal fabric embedded in a plastic resin material, and a plurality of intermediate layers of fibers, such as glass fibers embedded in plastic resin material, with the fibers of adjacent layers extending in different directions. The ends of the drum are thickened, and secured to flanges of end plates by screws having axially extending holes. Radially extending holes at the center of the shell are provided with tubular inserts. The holes axially extending through the screws also extend substantially radially relative to the drum.
Inventors
- 👤 Walter Dietzel
- 👤 Siegfried Matusch
- 👤 Volkmar Hentschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
B; B04; B04B; B04B7/00; B04B7/08; B04B7/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
In a centrifuge drum having a radially outer wall for supporting an internal strainer on its radially inner surface and a pair of end walls affixed to said outer wall, the improvement wherein said radially outer wall comprises a first layer of a plurality of cross-wise oriented fibers, a second layer radially inwardly of said first layer forming said radially inner surface of said radially outer wall and comprising a thin fine-meshed stainless steel fabric, and a plastic resin in which said first and second layers are embedded, said end walls having axially extending upper flanges to which said radially outer wall is affixed.
Claim 2
Dependent Claim
104 words
In a centrifuge drum having a radially outer wall for supporting an internal strainer on its radially inner surface and a pair of end walls affixed to said outer wall, the improvement wherein said radially outer wall comprises a first layer of a plurality of cross-wise oriented fibers, a second layer radially inwardly of said first layer forming said radially inner surface of said radially outer wall and comprising a thin fine-meshed stainless steel fabric, and a plastic resin in which said first and second layers are embedded, said end walls having axially extending upper flanges to which said radially outer wall is affixed.
Claim 3
Dependent Claim
23 words
The drum of claim 1, wherein said fibers of the first layer are glass fibers, wherein the plastic resin is an epoxy resin.
Claim 4
Dependent Claim
22 words
The drum of claim 1, wherein said fibers are glass fibers extending in axial and circumferential directions with respect to said drum.
Claim 5
Dependent Claim
17 words
The drum of claim 1 wherein said fibers are glass fibers extending helically relative to said drum.
Claim 6
Dependent Claim
37 words
The drum claim 1, wherein the axial center portion of said radially outer wall has a uniform diameter, and said radially outer wall at its ends is thicker than the center thereof to form thickened end portions.
Claim 7
Dependent Claim
48 words
The drum of claim 5, wherein said flanges of said end walls extend externally over the ends of said radially outer wall to fit tightly over the thickened end portions, and comprising fastening means extending radially through said flanges and the adjacent thickened end portions of said drum.
Claim 8
Dependent Claim
32 words
The drum of claim 6, wherein said fastening means comprises screws, said screws having axially extending holes, whereby the holes in said screws form discharge ports for material centrifuged in said drum.
Claim 9
Dependent Claim
36 words
The drum of claim 1, comprising a plurality of holes extending radially through said drum, and tubular sealing members inserted in said holes, whereby liquids and moisture are inhibited from ingress into said radially outer wall.
Claim 10
Dependent Claim
16 words
The drum of claim 8, wherein said tubular members comprise rivets having holes extending axially therethrough.
Claim 11
Dependent Claim
16 words
The drum of claim 8, wherein said tubular members comprise screws having holes extending axially therethrough.
Claim 12
Dependent Claim
23 words
The drum of claim 1, further comprising a radially outer layer of plastic material free of fibrous material on said radially outer wall.
Claim 13
Dependent Claim
57 words
The drum of claim 1, wherein said radially outer wall comprises a plurality of holes extending fully through the radially outer wall, said holes being initially formed by inserting a like plurality of cores into the radially outer wall as the latter is being formed and then removing these cores after the radially outer wall has hardened.
Claim 14
Dependent Claim
73 words
A drum for a centrifuge comprising a radially outer layer of a plastic resin free of fibrous material, a radially inner layer of a fine mesh stainless steel screen embedded in a plastic resin, and a plurality of radially intermediate layers each comprising fibers embedded in a plastic resin material, the fibers in adjacent layers extending in different directions, the plastic resin material of the layers of said drum shell being bonded together.
Claim 15
Dependent Claim
73 words
A drum for a centrifuge comprising a radially outer layer of a plastic resin free of fibrous material, a radially inner layer of a fine mesh stainless steel screen embedded in a plastic resin, and a plurality of radially intermediate layers each comprising fibers embedded in a plastic resin material, the fibers in adjacent layers extending in different directions, the plastic resin material of the layers of said drum shell being bonded together.
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |