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Patent US3853458A successfully refreshed from Google Patents.
US3853458A
Expired / Lapsed
US
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Rotary drum for the heat treatment of strongly erosive material
Assignee: ThyssenKrupp Industrial Solutions AG
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Filing: 1973-11-26
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Granted: 1974-12-10
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Expires: 1993-11-26
Abstract
Abstract A plurality of lifting blades comprising scoop edges and flat feet are replaceably affixed to the internal drum wall. A pair of wear plates lining the internal drum wall have opposed edges parallel to the drum axis that are spaced apart and lie under each lifting blade foot. A rib extending from the underside of each lifting blade foot, parallel to the drum axis, lies between the opposed edges of the pair of wear plates and abuts against the internal drum wall.
Inventors
- 👤 J Wurr
- 👤 A Vering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:40
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; F27B7/16; F27B7/161; F27B7/162
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A rotary drum for the heat treatment of strongly erosive material, comprising a plurality of wear plates lining the internal drum wall, which are arranged around the circumference of the drum, and a plurality of lifting blades each of which is replaceably secured to the internal drum wall between the opposing ends of two adjacent wear plates, and each of which has a foot that extends above both adjacent wear plates to retain the wear plates in position and is provided with a rib that extends parallel to the drum axis and abuts against the internal drum wall between the adjacent wear plates, to prevent fine material from flowing backward under the lifting blade.
Claim 2
Dependent Claim
114 words
A rotary drum for the heat treatment of strongly erosive material, comprising a plurality of wear plates lining the internal drum wall, which are arranged around the circumference of the drum, and a plurality of lifting blades each of which is replaceably secured to the internal drum wall between the opposing ends of two adjacent wear plates, and each of which has a foot that extends above both adjacent wear plates to retain the wear plates in position and is provided with a rib that extends parallel to the drum axis and abuts against the internal drum wall between the adjacent wear plates, to prevent fine material from flowing backward under the lifting blade.
Claim 3
Dependent Claim
44 words
A rotary drum according to claim 1 wherein each lifting blade foot has at least one projection secured to the internal drum wall, with which the rib is integral, and which lies in two opposed recesses in the opposed edges of two wear plates.
Claim 4
Dependent Claim
34 words
A rotary drum according to claim 1 wherein at least two pairs of wear plates have opposed edges parallel to the drum axis that are spaced apart and lie under each lifting blade foot.
Claim 5
Dependent Claim
48 words
A rotary drum according to claim 1 wherein a blade wall, curved in the direction of drum rotation, is formed integral with the trailing edge of each lifting blade foot and also integral with a scoop edge of the lifting blade, extending in the direction of drum rotation.
Claim 6
Dependent Claim
19 words
A rotary drum according to claim 4 wherein the scoop edge is generally parallel with the lifting blade foot.
Claim 7
Dependent Claim
52 words
A rotary drum according to claim 5 wherein the leading sides of the scoop edge and the lifting blade foot lie substantially in the same radial plane, but the width of the scoop edge is only about half the width of the lifting blade foot, measured in the direction of drum rotation.
Claim 8
Dependent Claim
25 words
A rotary drum according to claim 4 wherein the thickness of the scoop edge is substantially greater than the thickness of the curved blade wall.
Claim 9
Dependent Claim
19 words
A rotary drum according to claim 4 wherein the curved blade wall has profilings integrally formed on its surface.
Claim 10
Dependent Claim
20 words
A rotary drum according to claim 1 wherein the lifting blades have side walls substantially perpendicular to the drum axis.
Claim 11
Dependent Claim
27 words
A rotary drum according to claim 9 wherein each lifting blade has, between two side walls, at least one intermediate reinforcing wall perpendicular to the drum axis.
References Cited (Backward Citations)
FR871651A
Cited
DE1060775B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |