US3774770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sedimentation tanks
Assignee: Wedge Wire Co Ltd
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Filing: 1971-07-12
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Granted: 1973-11-27
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Expires: 1991-07-12
Abstract
Abstract A sedimentation tank for liquid purification has a submerged horizontal filtering screen for purifying liquid passing upward through it and a scraping mechanism for scraping sludge from the bottom of the tank towards a sludge outlet. The filtering screen extends across the greater part of the interior of the tank, the zone above it being partitioned from an adjoining zone through which extends downwardly a transmission element drivably connecting the scraping mechanism to an outside power source.
Inventors
- 👤 V Sparham
- 👤 G Pinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:28
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0012
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
229 words
An upwaRd flow sedimentation apparatus, comprising: a. a sedimentation tank having an inlet for the admission thereinto of liquid to be clarified and an outlet for the discharge of sludge therefrom, b. a filter screen extending substantially horizontally over the greater part of the interior of the tank between a lower zone for containing liquid to be clarified received from said inlet and an upper zone for containing liquid that has been clarified by upward passage through said filter screen, c. partitioning means separating said upper zone from an adjacent upper zone which is in open communication with said lower zone, d. a collecting channel provided with an outlet and arranged to receive clarified liquid from said first-mentioned upper zone and to convey it to the outlet of the collecting channel, e. scraper means arranged for movement over the floor of the tank so as to scrape sludge therefrom towards said sludge discharge outlet, f. driving means located outside said tank, g. power-transmission means drivably connecting said driving means to said scraper means and including a part extending downward through said adjacent upper zone into said lower zone, and h. a plurality of perforated trays having outlet openings communicating with the collecting channel and being positioned at horizontally spaced intervals above said filter screen for receiving clarified liquid from the first-mentioned upper zone and conveying it to said channel.
Claim 2
Dependent Claim
229 words
An upwaRd flow sedimentation apparatus, comprising: a. a sedimentation tank having an inlet for the admission thereinto of liquid to be clarified and an outlet for the discharge of sludge therefrom, b. a filter screen extending substantially horizontally over the greater part of the interior of the tank between a lower zone for containing liquid to be clarified received from said inlet and an upper zone for containing liquid that has been clarified by upward passage through said filter screen, c. partitioning means separating said upper zone from an adjacent upper zone which is in open communication with said lower zone, d. a collecting channel provided with an outlet and arranged to receive clarified liquid from said first-mentioned upper zone and to convey it to the outlet of the collecting channel, e. scraper means arranged for movement over the floor of the tank so as to scrape sludge therefrom towards said sludge discharge outlet, f. driving means located outside said tank, g. power-transmission means drivably connecting said driving means to said scraper means and including a part extending downward through said adjacent upper zone into said lower zone, and h. a plurality of perforated trays having outlet openings communicating with the collecting channel and being positioned at horizontally spaced intervals above said filter screen for receiving clarified liquid from the first-mentioned upper zone and conveying it to said channel.
Claim 3
Dependent Claim
79 words
An upward flow sedimentation apparatus as set forth in claim 1, wherein said scraper means includes a scraper blade secured to supporting arms that are pivotly mounted on the lower end of a scraper arm, an inclined supporting arm mounted on the lower end of said scraper arm and a member connected to said incline supporting arm and said scraper blade to limit the movement in at least one direction of the said supporting arms and said scraper blade.
Claim 4
Dependent Claim
80 words
An upward flow sedimentation apparatus as set forth in claim 1 wherein the tank is circular in plan view, the filter screen is a single rectangularly shaped filter screen located centrally with respect to the tank and being formed with a central opening, perforated trays having main portions and transverse portions positioned above said filter screen with the main portions extending diagonally across said filter screen, said main portions of said trays having outlet openings communicating with said collecting channel.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |