US3836006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Media feed system for a filtration device
Assignee: Envirotech Corp
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Filing: 1973-03-16
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Granted: 1974-09-17
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Expires: 1993-03-16
Abstract
Abstract Apparatus for feeding a lightweight continuous sheet of disposable filter medium from a large supply roll onto a rotary drum vacuum filter. The feeder includes at least one pair of endless gripper belts which are trained about rollers in face-toface relationship to grip the disposable medium therebetween to carry it from the supply roll to the filter. The roll of filter medium is mounted in a fixed cradle, a press roller is mounted on levers to continually press against the roll of paper as it unwinds and one of the gripper belts passes over the press roll against the paper roll to unwind the filter medium and carry it into the nip between the gripper belts for delivery to and release at a location adjacent the filter. The press roller and its associated belt are arranged to contact a relatively large area of the supply roll thus effecting rotation of the supply roll to assist in unwinding.
Inventors
- 👤 S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/044; B01D33/06; B01D33/073
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
357 words
A rotary drum vacuum filter comprising a filter tank, a cylindrical drum journalled for rotation in said tank, a drainage deck on said drum, means for applying a vacuum to said drainage deck, and means for continuously feeding a web of disposable filter web onto the outer surface of said drainage deck for rotation through said tank with said drum and for subsequently removing said web from said drainage deck for discharge, said last named means comprising a frame remote from said drum for rotatably supporting a roll of filter medium web, a plurality of rollers with axes substantially parallel to the axis of said drum, said rollers including: a. a first pair of rollers of which one roller is mounted adjacent said drum and the other roller is mounted adjacent said frame, at least one endless belt trained to pass successively about said first pair of rollers whereby said belt extends from a location adjacent said frame to a location adjacent said drum; b. a second pair of rollers, one roller of which is located adjacent the drum and the other roller of which is located adjacent said frame and an endless belt trained to pass successively about said rollers to extend between said frame and an endless belt trained to pass successively about said rollers to extend between said frame and said drum; and c. said first and second pairs of rollers being positioned relative to each other so that their associated belts are arranged in converging face-to-face relationship adjacent said frame thereby to provide a nip to accept a web introduced therebetween and from which nip said belts converge into closely spaced relationship thereby to grip between them a filter web to transport the same from said frame to a location adjacent said drum, means for disengaging said web from said belts adjacent said drum and directing said web onto said drainage deck for rotation therewith through said tank, belt means for guiding said web from said drainage deck to discharge after emergence from said tank, and means for driving said drum and said rollers with their associated belts at substantially the same speed.
Claim 2
Dependent Claim
357 words
A rotary drum vacuum filter comprising a filter tank, a cylindrical drum journalled for rotation in said tank, a drainage deck on said drum, means for applying a vacuum to said drainage deck, and means for continuously feeding a web of disposable filter web onto the outer surface of said drainage deck for rotation through said tank with said drum and for subsequently removing said web from said drainage deck for discharge, said last named means comprising a frame remote from said drum for rotatably supporting a roll of filter medium web, a plurality of rollers with axes substantially parallel to the axis of said drum, said rollers including: a. a first pair of rollers of which one roller is mounted adjacent said drum and the other roller is mounted adjacent said frame, at least one endless belt trained to pass successively about said first pair of rollers whereby said belt extends from a location adjacent said frame to a location adjacent said drum; b. a second pair of rollers, one roller of which is located adjacent the drum and the other roller of which is located adjacent said frame and an endless belt trained to pass successively about said rollers to extend between said frame and an endless belt trained to pass successively about said rollers to extend between said frame and said drum; and c. said first and second pairs of rollers being positioned relative to each other so that their associated belts are arranged in converging face-to-face relationship adjacent said frame thereby to provide a nip to accept a web introduced therebetween and from which nip said belts converge into closely spaced relationship thereby to grip between them a filter web to transport the same from said frame to a location adjacent said drum, means for disengaging said web from said belts adjacent said drum and directing said web onto said drainage deck for rotation therewith through said tank, belt means for guiding said web from said drainage deck to discharge after emergence from said tank, and means for driving said drum and said rollers with their associated belts at substantially the same speed.
Claim 3
Dependent Claim
82 words
A filter according to claim 1 wherein said one roller of one of said first and second pairs of rollers is mounted to move towards and away from the surface of a roll of filter web when the latter is rotatably supported in said frame and means are provided for urging said one roller toward the surface of said roll of filter web whereby to bring into contact with said surface a portion of the endless belt trained about said one roller.
Claim 4
Dependent Claim
62 words
A filter according to claim 2 in which said means for disengaging said filter web from said endless belts comprises at least one nozzle located adjacent the drum and arranged to direct pressure fluid against the surface of said web after it emerges from between said belts adjacent said drum to urge said web away from said belts toward said drainage deck.
Claim 5
Dependent Claim
370 words
In a filter of the type which has an endless porous belt trained between a filter section and the rollers of a cake discharge section spaced therefrom; the improvement of means for feeding a continuous sheet of filter medium onto and removing it from said filter section, said means comprising: a. a frame in fixed position relative to said filter and including means for supporting a supply roll of disposable filter medium to rotate freely about a horizontal axis; b. a plurality of levers, each of which is pivotally mounted on the frame adjacent to said supply roll to pivot one end on one side of the pivot point towards and away from the supply roll, said One end of each of said levers being of length greater than the maximum radius of said supply roll; c. means mounted on said frame operable on said lever to urge said one end toward the supply roll; d. rollers spacedly mounted on said one end of said lever; e. at least one first endless belt trained to travel along said one end of each of said levers on said rollers, said belt being arranged so that the outer surface thereof cradles the supply roll when said lever is pivoted theretoward, thereby to rotate the supply roll through frictional engagement therewith to unwind filter medium from the supply roll and carry the medium at least a short distance along said first endless belt, said first endless belt further being supported from said frame and trained to run from said lever to a position adjacent the filter device; f. at least one second endless belt supported and arranged on said frame to move face-to-face with a corresponding one of said first belts to grip the unwound filter medium therebetween and to carry it to said filter; g. means connected to said frame where the first and second endless belts begin their return run from the filter for disengaging the sheet of filter medium from said first and second endless belts and urging it toward said endless belt on the filter; h. means to drive said first and second endless belts as well as the endless belt of the filter all at the same speed.
Claim 6
Dependent Claim
370 words
In a filter of the type which has an endless porous belt trained between a filter section and the rollers of a cake discharge section spaced therefrom; the improvement of means for feeding a continuous sheet of filter medium onto and removing it from said filter section, said means comprising: a. a frame in fixed position relative to said filter and including means for supporting a supply roll of disposable filter medium to rotate freely about a horizontal axis; b. a plurality of levers, each of which is pivotally mounted on the frame adjacent to said supply roll to pivot one end on one side of the pivot point towards and away from the supply roll, said One end of each of said levers being of length greater than the maximum radius of said supply roll; c. means mounted on said frame operable on said lever to urge said one end toward the supply roll; d. rollers spacedly mounted on said one end of said lever; e. at least one first endless belt trained to travel along said one end of each of said levers on said rollers, said belt being arranged so that the outer surface thereof cradles the supply roll when said lever is pivoted theretoward, thereby to rotate the supply roll through frictional engagement therewith to unwind filter medium from the supply roll and carry the medium at least a short distance along said first endless belt, said first endless belt further being supported from said frame and trained to run from said lever to a position adjacent the filter device; f. at least one second endless belt supported and arranged on said frame to move face-to-face with a corresponding one of said first belts to grip the unwound filter medium therebetween and to carry it to said filter; g. means connected to said frame where the first and second endless belts begin their return run from the filter for disengaging the sheet of filter medium from said first and second endless belts and urging it toward said endless belt on the filter; h. means to drive said first and second endless belts as well as the endless belt of the filter all at the same speed.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |