Patent US3918893A successfully refreshed from Google Patents.
US3918893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elongated rotary drum shell construction
Assignee: Allis Chalmers Corp
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Filing: 1974-11-13
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Granted: 1975-11-11
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Expires: 1994-11-13
Abstract
Abstract A cylindrical rotary drum arrangement which provides adequate longitudinal strength for a given weight and permits the inner shell to expand relative to the outer shell by utilizing angular separators between the inner and outer shells. The angular separators act as springs between the outer and inner shells permitting relative rotation between the shells to occur and also permit expansion of the inner shell relative to the outer shell.
Inventors
- 👤 Orion C Whitaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:14
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/22; F27B7/2206; F27B2007/2213; F27B2007/222; F27B7/26; F27B2007/261; F27B2007/262
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
In a kiln having an elongated rotary drum comprising: an elongated cylindrical inner shell; an elongated cylindrical outer shell surrounding said inner shell in coaxial relationship; and, a plurality of circumferentially spaced apart angular separators operably connected between said inner and outer shells having end connections with said inner and outer shells to provide for an angular connection between said shells, said separators having means to distort angularly so that relative rotation between said inner and outer shells will occur to dissipate radial outwardly acting forces from said inner shell due to expansion of said inner shell.
Claim 2
Dependent Claim
97 words
In a kiln having an elongated rotary drum comprising: an elongated cylindrical inner shell; an elongated cylindrical outer shell surrounding said inner shell in coaxial relationship; and, a plurality of circumferentially spaced apart angular separators operably connected between said inner and outer shells having end connections with said inner and outer shells to provide for an angular connection between said shells, said separators having means to distort angularly so that relative rotation between said inner and outer shells will occur to dissipate radial outwardly acting forces from said inner shell due to expansion of said inner shell.
Claim 3
Dependent Claim
56 words
A kiln according to claim 1 wherein said angular separators are each formed with two substantially parallel inner and outer legs and an inclined web therebetween, one of said legs operating to form a portion of the outer shell and the other of said legs operating as a base which is welded to said inner shell.
Claim 4
Dependent Claim
52 words
A kiln according to claim 2 wherein said angular separators are arranged in circumferential relationship about said inner shell in a manner that said outer legs of each separator abuts an outer leg of an adjacent separator and said abutting legs are welded together to form the outer shell of said drum.
Claim 5
Dependent Claim
37 words
A kiln according to claim 3 wherein said leg of each of said separators which form a portion of the outer shell is longer in length than the assoociated leg which forms the base of said separator.
Claim 6
Dependent Claim
60 words
A kiln according to claim 4 wherein said longer leg of said separator extends from one end of said web in a direction away from the web and the other leg which forms the base of said separator extends from the other end of said web but in a direction opposite to the direction in which said longer leg extends.
Claim 7
Dependent Claim
14 words
A kiln according to claim 5 wherein said angular separator is an extruded member.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |