Patent US3780447A successfully refreshed from Google Patents.
US3780447A
Expired / Lapsed
US
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Rotary dryer
Assignee: VISTA POLYMERS Inc A DE CRP AND WHOLLY-OWNED SUBSIDIARY OF VISTA CHEMICAL Co
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Filing: 1972-04-03
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Granted: 1973-12-25
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Expires: 1992-04-03
Abstract
Abstract An improved rotary dryer having radially extended flights generally near the material feed end of the dryer, and a dam assembly having a movable ring segment rotatable between a dam position, wherein the movable ring segment extends in a direction transverse to the general direction of material flow through the dryer, and a flight position, wherein the movable ring segment extends in a direction aligned with the general direction of material flow through the dryer.
Inventors
- 👤 H Fales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:14
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/06; B29B13/065; F; F26; F26B; F26B11/00; F26B11/02; F26B11/04; F26B11/0463
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
375 words
A rotary dryer receiving a drying medium and material for reducing the moisture content of a material as the material moves through the rotary dryer, comprising: a shell having a material feed end, a material discharge end and a hollow portion extending therethrough forming an inner peripheral surface; means receiving the material to be dried within the hollow portion of the shell generally near the material receiving end; means receiving the drying medium within the hollow portion of the shell; and dam means supported within the hollow portion of the shell having a portion movable between a dam position, wherein the movable portion extends in a direction transverse to the general direction of the material flow through the shell, and a flight position, wherein the movable portion extends in a direction aligned with the general direction of the material flow through the shell; and at least one dam disposed within the hollow portion of the shell, each dam comprising: a ring member having an outer periphery disposed generally near the inner periphery surface of the shell and an opening through a central portion thereof forming an inner periphery; and the ring member is defined further to include: an arc-shaped stationary ring segment, having an inner periphery and an outer periphery, the outer periphery secured to a portion of the inner peripheral surface of the shell; an arc-shaped movable ring segment, having an inner periphery and an outer periphery and opposite ends, movable between the dam position and the flight position, the movable ring segment disposed in a plane substantially coplanar with the stationary ring segment in the dam position thereof and disposed in a plane generally transverse to the planar disposition of the stationary ring segment in the flight position thereof, the outer peripheries of the movable ring segment and the stationary ring segment forming the outer periphery of the ring member in the dam position of the movable ring segment, and the inner peripheries of the stationary ring segment and the movable ring segment forming the inner periphery of the ring member in the dam position of the movable ring segment; and turning means connected to the movable ring segment for rotating the movable ring segment between the dam position and the flight position.
Claim 2
Dependent Claim
375 words
A rotary dryer receiving a drying medium and material for reducing the moisture content of a material as the material moves through the rotary dryer, comprising: a shell having a material feed end, a material discharge end and a hollow portion extending therethrough forming an inner peripheral surface; means receiving the material to be dried within the hollow portion of the shell generally near the material receiving end; means receiving the drying medium within the hollow portion of the shell; and dam means supported within the hollow portion of the shell having a portion movable between a dam position, wherein the movable portion extends in a direction transverse to the general direction of the material flow through the shell, and a flight position, wherein the movable portion extends in a direction aligned with the general direction of the material flow through the shell; and at least one dam disposed within the hollow portion of the shell, each dam comprising: a ring member having an outer periphery disposed generally near the inner periphery surface of the shell and an opening through a central portion thereof forming an inner periphery; and the ring member is defined further to include: an arc-shaped stationary ring segment, having an inner periphery and an outer periphery, the outer periphery secured to a portion of the inner peripheral surface of the shell; an arc-shaped movable ring segment, having an inner periphery and an outer periphery and opposite ends, movable between the dam position and the flight position, the movable ring segment disposed in a plane substantially coplanar with the stationary ring segment in the dam position thereof and disposed in a plane generally transverse to the planar disposition of the stationary ring segment in the flight position thereof, the outer peripheries of the movable ring segment and the stationary ring segment forming the outer periphery of the ring member in the dam position of the movable ring segment, and the inner peripheries of the stationary ring segment and the movable ring segment forming the inner periphery of the ring member in the dam position of the movable ring segment; and turning means connected to the movable ring segment for rotating the movable ring segment between the dam position and the flight position.
Claim 3
Dependent Claim
89 words
The rotary dryer of claim 1 wherein the turning means is defined further to include: a shaft, having an upper end portion extending through the shell and a lower end portion extending outwardly beyond the shell, the upper end portion connected to the movable ring member; means connected to the lower end portion of the shaft for rotating the movable ring segment connected thereto between the dam position and the flight position; and seal means sealingly engaging the shaft and a portion of the shell forming a seal therebetween.
Claim 4
Dependent Claim
76 words
The rotary dryer of claim 2 wherein the movable ring member is movably supported within the shell and a clearance gap exists generally between the outer periphery of the movable ring member and the inner peripheral surface of the shell; and wherein the means for rotating the movable ring member is defined further to include: bearing means interposed generally between the outer periphery of the movable ring member and the inner peripheral surface of the shell.
Claim 5
Dependent Claim
36 words
The rotary dryer of claim 2 wherein the turning means includes: means to secure the shaft in predetermined rotated positions thereby securing the movable ring member connected thereto in the dam pOsition and the flight position.
Claim 6
Dependent Claim
49 words
The rotary dryer of claim 1 wherein the ring member includes a plurality of movable ring segments; and wherein the dam is defined further to include: turning means connected to each movable ring segment for independently rotating each movable ring segment between the dam position and the flight position.
Claim 7
Dependent Claim
30 words
The rotary dryer of claim 1 defined further to include: more than one dam supported within the hollow portion of the shell, the dam being longitudinally spaced in the shell.
Claim 8
Dependent Claim
55 words
The rotary dryer of claim 1 defined further to include: a plurality of circumferentially spaced flight member means, each flight member means secured to the inner peripheral surface of the shell; and wherein the movable ring segment is positioned and has a circumferential length for rotation generally between the flight member means generally adjacent thereto.
Claim 9
Dependent Claim
52 words
The rotary dryer of claim 1 defined further to include: a plurality of circumferentially spaced, longitudinally extending flight member means, the flight member means generally near the material receiving end of the shell extending a greater distance radially inwardly with respect to the radial inwardly extension of the remaining flight member means.
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |