US3890235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum filter
Assignee: Envirotech Corp
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Filing: 1974-07-22
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Granted: 1975-06-17
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Expires: 1994-07-22
Abstract
Abstract An open frame rotary cylindrical filter construction is disclosed in which the rotary element is formed from a plurality of individual concave filter sectors mounted radially about a central hub. Each sector includes an elongated cone shaped basket or cup having an open mouth at its outer or base end and a restricted outlet opening inwardly from its apex. A flange is formed about the mouth of the sector and the sectors are held in place by tie rods extending radially from the hub to engage the flanges to pull the sectors toward the hub. The apex of each sector is pulled into sealing relationship with a drainage conduit leading to a filter valve at one end of the structure. The flanges of adjacent sectors combine to form a cylindrical structure supported by the tie rods and drainage conduits. Usual trunnions are provided at each end for journalling the structure for rotation.
Inventors
- 👤 Steven S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:50
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/27; B01D33/44; B01D33/48; B01D33/52; B01D2201/00; B01D2201/02; B01D2201/28; B01D2201/282
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
274 words
A rotary Vacuum filter of the type including a tank for holding a slurry to be filtered, a rotary filter element including a plurality of filter sectors and mounted for rotation in said tank whereby said sectors pass successively into and out of submergence in said slurry, a valve and associated conduits for applying vacuum to the interior of each of said sectors during submergence and for supplying pressured fluid to the interior of said sector after emergence; the improvement in which said rotary filter element comprises a substantially cylindrical member having an elongated axial hub and an outer wall formed from a plurality of separate filter sectors each of which comprises a relatively deep concave vessel having an outwardly facing open mouth at one end and a relatively small opening in its wall remote from said open mouth, all of said vessels being spaced radially and concentrically about said hub, a plurality of conduits including a conduit extending between said relatively small opening of each of said vessels and said valve, clamp means securing all of said vessels in said spaced radial and concentric position about said hub with the outwardly facing open mouths of said sectors lying in a substantially cylindrical surface of revolution an elongated concave flexible filter medium associated with each of said vessels each ofsaid filter mediums having one open end, and means associated with each of said vessels for securing the open end of one of said filter mediums to the open mouth of said vessel whereby said medium may be pulled into said vessel when vacuum is applied thereto and everted when pressured fluid is applied thereto.
Claim 2
Dependent Claim
274 words
A rotary Vacuum filter of the type including a tank for holding a slurry to be filtered, a rotary filter element including a plurality of filter sectors and mounted for rotation in said tank whereby said sectors pass successively into and out of submergence in said slurry, a valve and associated conduits for applying vacuum to the interior of each of said sectors during submergence and for supplying pressured fluid to the interior of said sector after emergence; the improvement in which said rotary filter element comprises a substantially cylindrical member having an elongated axial hub and an outer wall formed from a plurality of separate filter sectors each of which comprises a relatively deep concave vessel having an outwardly facing open mouth at one end and a relatively small opening in its wall remote from said open mouth, all of said vessels being spaced radially and concentrically about said hub, a plurality of conduits including a conduit extending between said relatively small opening of each of said vessels and said valve, clamp means securing all of said vessels in said spaced radial and concentric position about said hub with the outwardly facing open mouths of said sectors lying in a substantially cylindrical surface of revolution an elongated concave flexible filter medium associated with each of said vessels each ofsaid filter mediums having one open end, and means associated with each of said vessels for securing the open end of one of said filter mediums to the open mouth of said vessel whereby said medium may be pulled into said vessel when vacuum is applied thereto and everted when pressured fluid is applied thereto.
Claim 3
Dependent Claim
80 words
A filter according to claim 1 in which said relatively small opening in the walls of said vessels is located at the inward ends thereof and said conduits extending between said openings and said valve include a plurality of manifolds arranged concentrically about and parallel to the axis of said hub, a plurality of said vessels are arranged radially of said hub and each of said manifolds, and all of said vessels radial to a given manifold are connected thereto.
References Cited (Backward Citations)
US519275A
Cited
US1878998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |