# US 7,077,957 B2 · Overflow screening device

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- Number: US 7,077,957 B2
- Document ID: US7077957B2
- Status: Granted
- Kind: B2
- Application number: 10/390,746
- Filed: 2003-03-19
- Published: 2003-09-25
- Granted: 2006-07-18
- Earliest claimed: 2002-03-25
- Assignees: Son Screen Pty Ltd
- Inventors: Stephen John Posselt
- Web page: https://patentgrep.com/patent/US7077957B2

## CPC

- B01D 29/118: {open-ended}
- B01D 29/6415: {with a rotary movement with respect to the filtering element}
- B01D 29/6446: {with a rotary movement with respect to the filtering element}
- B01D 29/908: {provoking a tangential stream}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A screening device which is particularly useful for separating solids from liquids when sewerage systems overflow. The device includes an inner apertured chamber and an internal brush arrangement for sweeping over the apertures to prevent clogging. A spray enables the apertured chamber to be washed after use.

## Claims

### Claim 1

An overflow screening device used in association with the overflow of a sewerage system, said screening device comprising an internal coaxially aligned cylindrical chamber having a cylindrical side wall section with a plurality of apertures and an internal brush arrangement for sweeping over the apertures,
said screening device further including a solids/liquid inlet tangentially located with respect to the side wall of the internal cylindrical chamber,
a solids outlet in the bottom of the device within the boundaries of the internal cylindrical chamber, and
wherein the solids are returned by way of the solids outlet to the sewerage system.

### Claim 2 (depends on 1)

An overflow screening device as claimed in claim 1, wherein the apertures in the internal cylindrical chamber are dimensioned to enable the effective separation of a diverse range of solids.

### Claim 3 (depends on 1)

An overflow screening device as claimed in claim 1, wherein the apertures in the internal cylindrical chamber are in the order of 3 to 5 mm in diameter.

### Claim 4 (depends on 1)

An overflow screening device as claimed in claim 1 and including a spray system for washing the interior of the internal cylindrical chamber.

### Claim 5 (depends on 1)

An overflow screening device according to claim 1 wherein said cylindrical chamber is substantially vertically disposed within the overflow screening device.

### Claim 6 (depends on 5)

An overflow screening device as claimed in claim 5, which has a cylindrically shaped upper section and a conically shaped lower section.

### Claim 7 (depends on 6)

An overflow screening device as claimed in claim 6, wherein the internal cylindrical chamber extends down from the top region of the device to the conical lower section.

### Claim 8 (depends on 5)

An overflow screening device as claimed in claim 5, wherein an upper region of the internal cylindrical chamber has a solid wall and a lower region has an apertured wall.

### Claim 9 (depends on 5)

An overflow screening device as claimed in claim 5, wherein the solids/liquid inlet is located juxtaposed with respect to an upper region of the internal cylindrical chamber.

### Claim 10 (depends on 5)

An overflow screening device as claimed in claim 5, wherein the brush arrangement comprises a plurality of rectangular frameworks with attached bristles on lower outer sections, which are supported for rotation on a vertically extending axle which is aligned with the axis of the device.

### Claim 11 (depends on 10)

An overflow screening device as claimed in claim 10, wherein rectangularly shaped vanes extend outwardly from upper sections of the rectangular frameworks.