EP0554740B1 - Pump with filtering device - Google Patents
Pump with filtering device Download PDFInfo
- Publication number
- EP0554740B1 EP0554740B1 EP93101048A EP93101048A EP0554740B1 EP 0554740 B1 EP0554740 B1 EP 0554740B1 EP 93101048 A EP93101048 A EP 93101048A EP 93101048 A EP93101048 A EP 93101048A EP 0554740 B1 EP0554740 B1 EP 0554740B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conveyor
- sieve
- trough
- tube
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/08—Scoop devices
- F04B19/12—Scoop devices of helical or screw-type
Definitions
- the present invention relates to a feed pump for waste water, in particular in sewage treatment plants, with a screw conveyor, which is rotatably arranged in an inclined feed pipe or feed trough, at the lower end of which there is an inlet opening and at the higher end of which there is an outlet opening a sieve is provided in the higher section of the conveying pipe or trough and is arranged in such a way that at least part of the highly conveyed waste water runs off through the sieve.
- Such a feed pump, with a feed trough, is already known from DE-A-2 025 692.
- Another screw pump is known for example from DE-A-3 006 057.
- Screw pumps of this type are frequently used in sewage treatment plants because of their robustness and insensitivity, since the wastewater often reaches the sewage treatment plant at a lower level than the level in the settling tanks. Pumping up the waste water is sometimes necessary between different clarification tanks or stages. The incoming wastewater is interspersed with more or less coarse impurities. These are usually caught on a so-called rake or a sieve, which are connected upstream or downstream of the feed pump. However, this disadvantageously requires a corresponding running path for the waste water, which must be accessible for cleaning the rake or sieve.
- the screening device Regardless of the specific design of the screening device, it is in any case an additional device to the pump with a corresponding space requirement, which also requires energy in the case of active screening devices.
- the upper region of the trough is already designed as a sieve through which the liquid components flow downward while the solid components in the pump are conveyed higher by the screw conveyor.
- the solid components are pushed away by the screw conveyor over the edge of the sieve, which also forms the edge of the trough.
- the object of the present invention is to provide a conveying device which enables better drainage of the solid components and in which the solid components can be discharged without water being applied to the surroundings of the discharge area.
- the sieve device can be arranged between the already existing drain opening and the screw conveyor in such a way that the waste water must forcibly pass through the sieve, and a separate drain opening or several separate drain openings are provided, part of the water drainage taking place through the sieve device and some of the waste water can escape from other drain openings that are not blocked by the sieve.
- the feed pump which is present anyway, is thus converted in such a way that it works simultaneously as a sieving device.
- An embodiment of the invention is particularly preferred in which a sieve forms at least a part of the lower surface of the conveyor tube or trough in the upper section of the conveyor tube and transports the contaminants retained by the sieve and accumulating thereon from the screw conveyor in the direction of the tube end which is expediently open or has a collecting device for the material retained by the sieve. It is advantageously achieved that the wastewater, as it is conveyed upward in the trough by the screw conveyor, runs down through the sieve as soon as it has reached the pipe section in which the lower surface is formed by the sieve, the solid constituents subsequently be drained even further.
- An embodiment of the invention is particularly preferred in which the conveyor tube, in continuation of the sieve section, has a press section which consists of a tapered or tapering end section of the conveyor tube, in which the conveyor screw reduced to a corresponding cross section extends.
- the screw conveyor has a reduced pitch in the pressing section.
- the reduced pitch inevitably entails compression and thus squeezing and dewatering of the material retained by the sieve.
- sieve openings can optionally be provided on the underside of the trough so that the water largely runs out of the material retained by the sieve.
- the reduced pitch already results from the reduced diameter of the pressing section, but it can additionally be reduced even more by a smaller pitch.
- wastewater is pumped from a deep-lying basin 10 into a higher-lying basin 11, which is only indicated by dashed lines.
- the pump device consists of a pipe 2 revolving screw conveyor 1, which is driven by a drive device 5 via the shaft 9.
- the water runs at the lower section 3 of the pipe through the front opening 2a into the pipe 2 into the first lower screw flight and is gradually conveyed upwards by rotating the screw 1 essentially in the lower half of the pipe.
- a higher-lying section 4 of the tube 2 has, in addition to the front opening 2b, a recess 2c located on the underside of this section, on which the otherwise closed pipe is replaced by a sieve wall 6.
- the water conveyed by the screw via this end section 4 of the tube 2 then flows downward through the openings of the sieve into the basin 11 arranged below it.
- the material retained by the sieve plate 6 is conveyed out of the pump through the front opening 2b of the tube 2 and can be collected in a separate device, for example a container 12, a conveyor belt or the like.
- the device shown in FIG. 2 largely corresponds to the device just described, but instead of the front-side outlet opening 2b, a tapered pipe section 7 is initially provided, through which the screw conveyor 1 also extends with a correspondingly reduced diameter.
- This section 7 serves as a pressing device for the material retained by the screen 6. Due to the reduced pipe cross-section and the simultaneously reduced pitch of the screw 1 in this section 7, there is necessarily a compression of the material retained by the screen 6 and conveyed further, this being additionally pressed out, so that further water can run off from this material.
- the screw walls can be perforated in this upper end section 7, or the tube 2 in this end section 7 is again formed on its underside as a sieve or provided with individual bores.
- the feed pump according to the invention combines pumping and sieving devices in one device in a space-saving manner, wherein additional energy can be saved if the feed pump according to the invention replaces so-called active sieving devices in which the waste water is pumped through a sieve within a basin.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Screw Conveyors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Disintegrating Or Milling (AREA)
- Fats And Perfumes (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Förderpumpe für Abwässer, insbesondere in Kläranlagen, mit einer Förderschnecke, welche in einem geneigten Förderrohr bzw. Fördertrog drehbar angeordnet ist, an dessen tiefer liegendem Ende sich eine Zulauföffnung und an dessen höher gelegenem Ende eine Ablauföffnung vorgesehen ist, wobei an dem höher gelegenen Abschnitt des Förderrohres bzw. -troges ein Sieb vorgesehen und derart angeordnet ist, daß zumindest ein Teil des höchgeförderten Abwassers über das Sieb abläuft.The present invention relates to a feed pump for waste water, in particular in sewage treatment plants, with a screw conveyor, which is rotatably arranged in an inclined feed pipe or feed trough, at the lower end of which there is an inlet opening and at the higher end of which there is an outlet opening a sieve is provided in the higher section of the conveying pipe or trough and is arranged in such a way that at least part of the highly conveyed waste water runs off through the sieve.
Eine derartige Förderpumpe ist, mit einem Fördertrog, bereits aus der DE-A-2 025 692 bekannt. Eine weitere Schneckenpumpe ist beispielsweise aus der DE-A-3 006 057 bekannt. Derartige Schneckenförderpumpen werden wegen ihrer Robustheit und Unempfindlichkeit häufig in Kläranlagen eingesetzt, da die Abwässer häufig auf einem tiefer gelegenen Niveau die Kläranlage erreichen als es dem Stand in den Klärbecken entspricht. Auch zwischen verschiedenen Klärbecken oder -stufen ist gelegentlich ein Hochpumpen des Abwassers erforderlich. Die ankommenden Abwässer sind mit mehr oder weniger groben Verunreinigungen durchsetzt. Diese werden üblicherweise an einem sogenannten Rechen oder einem Sieb, welche der Förderpumpe vor- oder nachgeschaltet sind, abgefangen. Dies erfordert jedoch mit Nachteil eine entsprechende Laufstrecke für das Abwasser, die zur Reinigung des Rechens oder Siebes zugänglich sein muß.Such a feed pump, with a feed trough, is already known from DE-A-2 025 692. Another screw pump is known for example from DE-A-3 006 057. Screw pumps of this type are frequently used in sewage treatment plants because of their robustness and insensitivity, since the wastewater often reaches the sewage treatment plant at a lower level than the level in the settling tanks. Pumping up the waste water is sometimes necessary between different clarification tanks or stages. The incoming wastewater is interspersed with more or less coarse impurities. These are usually caught on a so-called rake or a sieve, which are connected upstream or downstream of the feed pump. However, this disadvantageously requires a corresponding running path for the waste water, which must be accessible for cleaning the rake or sieve.
Unabhängig von der konkreten Ausgestaltung der Siebeinrichtung, stellt sie in jedem Fall eine zusätzlich zu der Pumpe vorgesehene Einrichtung mit entsprechendem Platzbedarf dar, die im Falle aktiver Siebeinrichtungen auch Energie benötigen. Bei der aus der DE-A-2 025 692 bekannten Pumpe, welche aus einem geneigten Trog mit einem teilkreisförmigen Querschnitt und einer darin drehbar angeordneten Förderschraube besteht, ist der obere Bereich des Troges bereits als Sieb ausgebildet, durch welches die flüssigen Bestandteile nach unten abfließen, während die festen, in der Pumpe befindlichen Bestandteile durch die Förderschnecke höher gefördert werden. Bei der bekannten Pumpe werden die festen Bestandteile durch die Förderschnecke über den Rand des Siebes, welcher gleichzeitig den Rand des Troges bildet hinweggeschoben .Regardless of the specific design of the screening device, it is in any case an additional device to the pump with a corresponding space requirement, which also requires energy in the case of active screening devices. In the pump known from DE-A-2 025 692, which consists of an inclined trough with a part-circular cross section and a feed screw rotatably arranged therein, the upper region of the trough is already designed as a sieve through which the liquid components flow downward while the solid components in the pump are conveyed higher by the screw conveyor. In the known pump, the solid components are pushed away by the screw conveyor over the edge of the sieve, which also forms the edge of the trough.
Gegenüber diesem Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Fördereinrichtung zu schaffen, welche eine bessere Entwässerung der festen Bestandteile ermöglicht und bei welcher die festen Bestandteile ausgetragen werden können, ohne daß die Umgebung des Austragungsbereiches mit Wasser beaufschlagt wird.Compared to this prior art, the object of the present invention is to provide a conveying device which enables better drainage of the solid components and in which the solid components can be discharged without water being applied to the surroundings of the discharge area.
Diese Aufgabe wird durch den Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.
Dabei kann die Siebeinrichtung so zwischen der ohnehin vorhandenen Ablauföffnung und der Förderschnecke angeordnet werden, daß das Abwasser zwangsweise durch das Sieb hindurchtreten muß, und es ist eine separate Ablauföffnung bzw. sind mehrere separate Ablauföffnungen vorgesehen, wobei ein Teil des Wasserablaufes durch die Siebeinrichtung erfolgt und ein Teil des Abwassers aus anderen, nicht vom Sieb versperrten Ablauföffnungen austreten kann.The sieve device can be arranged between the already existing drain opening and the screw conveyor in such a way that the waste water must forcibly pass through the sieve, and a separate drain opening or several separate drain openings are provided, part of the water drainage taking place through the sieve device and some of the waste water can escape from other drain openings that are not blocked by the sieve.
Damit wird die ohnehin vorhandene Förderpumpe dahingehend umfunktioniert, daß sie gleichzeitig als Siebeinrichtung arbeitet. Besonders bevorzugt ist dabei eine Ausführungsform der Erfindung, bei welcher im oberen Abschnitt des Förderrohres bzw. -troges ein Sieb zumindest einen Teil der unteren Fläche desselben bildet, die vom Sieb zurückgehaltenen und auf diesem sich ansammelnden Verunreinigungen von der Förderschnecke weiter in Richtung des Rohrendes transportiert werden, welche zweckmäßigerweise offen ist oder eine Auffangvorrichtung für das vom Sieb zurückgehaltene Material aufweist. Mit Vorteil erreicht man dabei, daß das Abwasser, während es durch die Förderschnecke im Trog hochbefördert wird, nach unten durch das Sieb abläuft, sobald es den Rohrabschnitt erreicht hat, in welchem die untere Fläche von dem Sieb gebildet wird, wobei die festen Bestandteile anschließend noch weiter entwässert werden.The feed pump, which is present anyway, is thus converted in such a way that it works simultaneously as a sieving device. An embodiment of the invention is particularly preferred in which a sieve forms at least a part of the lower surface of the conveyor tube or trough in the upper section of the conveyor tube and transports the contaminants retained by the sieve and accumulating thereon from the screw conveyor in the direction of the tube end which is expediently open or has a collecting device for the material retained by the sieve. It is advantageously achieved that the wastewater, as it is conveyed upward in the trough by the screw conveyor, runs down through the sieve as soon as it has reached the pipe section in which the lower surface is formed by the sieve, the solid constituents subsequently be drained even further.
Damit wird das Sieb automatisch durch die Fördereinrichtung gereinigt und freigehalten, so daß auch der zusätzliche Arbeitsgang der Reinigung des sonst üblichen Rechens entfällt. Es versteht sich, daß das durch das Sieb ablaufende Abwasser auf einem entsprechend höheren Niveau in das anschließende Klärbecken weitergeleitet wird.So that the sieve is automatically cleaned and kept free by the conveyor, so that the additional operation of cleaning the otherwise usual rake is omitted. It goes without saying that the wastewater running through the sieve is passed on to the subsequent clarifier at a correspondingly higher level.
Besonders bevorzugt ist eine Ausführungsform der Erfindung, bei welcher das Förderrohr in Fortsetzung des Siebabschnittes einen Preßabschnitt aufweist, der aus einem verjüngten bzw. sich verjüngenden Endabschnitt des Förderrohres besteht, in welchen sich die auf einen entsprechenden Querschnitt reduzierte Förderschnecke erstreckt.An embodiment of the invention is particularly preferred in which the conveyor tube, in continuation of the sieve section, has a press section which consists of a tapered or tapering end section of the conveyor tube, in which the conveyor screw reduced to a corresponding cross section extends.
Dabei hat es sich als zweckmäßig erwiesen, wenn die Förderschnecke im Preßabschnitt eine reduzierte Ganghöhe aufweist. Die reduzierte Ganghöhe bringt zwangsweise eine Verdichtung und damit ein Auspressen und Entwässern des vom Sieb zurückgehaltenen Materials mit sich. Auch im Preßabschnitt können gegebenenfalls noch Sieböffnungen an der Unterseite des Troges vorgesehen sein, damit das Wasser weitgehend aus dem vom Sieb zurückgehaltenen Material herausläuft.It has proven to be useful if the screw conveyor has a reduced pitch in the pressing section. The reduced pitch inevitably entails compression and thus squeezing and dewatering of the material retained by the sieve. Also in the pressing section, sieve openings can optionally be provided on the underside of the trough so that the water largely runs out of the material retained by the sieve.
Die reduzierte Ganghöhe ergibt sich bei gleicher Schneckensteigung schon durch den reduzierten Durchmesser des Preßabschnittes, sie kann jedoch zusätzlich durch eine geringere Steigung noch stärker reduziert werden.For the same screw pitch, the reduced pitch already results from the reduced diameter of the pressing section, but it can additionally be reduced even more by a smaller pitch.
Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung werden deutlich anhand der folgenden Beschreibung bevorzugter Ausführungsformen und der dazugehörigen Figuren. Es zeigen:
- Figur 1
- eine teilweise weggebrochene Seitenansicht einer ersten Ausführungsform der Erfindung und
Figur 2- eine Seitenansicht einer zweiten Ausführungsform.
- Figure 1
- a partially broken side view of a first embodiment of the invention and
- Figure 2
- a side view of a second embodiment.
In Figur 1 wird Abwasser aus einem tief gelegenen Becken 10 in ein nur gestrichelt angedeutetes höher gelegenes Becken 11 gepumpt. Die Pumpeinrichtung besteht aus einer in einem Rohr 2 umlaufenden Förderschnecke 1, welche über die Welle 9 von einer Antriebsvorrichtung 5 angetrieben wird. Das Wasser läuft am tiefer gelegenen Abschnitt 3 des Rohres durch die stirnseitige Öffnung 2a in das Rohr 2 in den ersten unteren Schneckengang hinein und wird durch Drehung der Schnecke 1 im wesentlichen in der unteren Rohrhälfte allmählich nach oben gefördert. Ein höher gelegener Abschnitt 4 des Rohres 2 weist neben der stirnseitigen Öffnung 2b auch eine an der Unterseite dieses Abschnittes gelegene Aussparung 2c auf, an welcher das ansonsten geschlossene Rohr durch eine Siebwand 6 ersetzt ist. Das von der Schnecke über diesen Endabschnitt 4 des Rohres 2 beförderte Wasser fließt dann über die Öffnungen des Siebes nach unten in das darunter angeordnete Becken 11 ab. Das von der Siebplatte 6 zurückgehaltene Material wird durch die stirnseitige Öffnung 2b des Rohres 2 aus der Pumpe hinausbefördert und kann in einer separaten Einrichtung, z.B. einem Container 12, einem Förderband oder dergleichen, aufgefangen werden.In FIG. 1, wastewater is pumped from a deep-lying
Die in Figur 2 dargestellte Vorrichtung stimmt mit der eben beschriebenen Vorrichtung weitgehend überein, wobei jedoch anstelle der stirnseitigen Austrittsöffnung 2b zunächst ein verjüngter Rohrabschnitt 7 vorgesehen ist, durch welchen sich auch die Förderschnecke 1 mit entsprechend reduziertem Durchmesser erstreckt. Dieser Abschnitt 7 dient als Preßeinrichtung für das vom Sieb 6 zurückgehaltene Material. Aufgrund des verringerten Rohrquerschnittes und der gleichzeitig verringerten Ganghöhe der Schnecke 1 in diesem Abschnitt 7 findet notwendigerweise eine Verdichtung des vom Sieb 6 zurückgehaltenen und weiterbeförderten Materials statt, wobei dieses zusätzlich ausgepreßt wird, so daß weiteres Wasser aus diesem Material ablaufen kann. Zu diesem Zweck können die Schneckenwände in diesem oberen Endabschnitt 7 perforiert sein oder aber das Rohr 2 wird in diesem Endabschnitt 7 an seiner Unterseite nochmals als Sieb ausgebildet bzw. mit einzelnen Bohrungen versehen.The device shown in FIG. 2 largely corresponds to the device just described, but instead of the front-side outlet opening 2b, a tapered pipe section 7 is initially provided, through which the screw conveyor 1 also extends with a correspondingly reduced diameter. This section 7 serves as a pressing device for the material retained by the
Die erfindungsgemäße Förderpumpe vereint in platzsparender Weise Pumpen- und Siebeinrichtungen in einem Gerät, wobei zusätzlich Energie eingespart werden kann, wenn die erfindungsgemäße Förderpumpe sogenannte aktive Siebeinrichtungen ersetzt, bei welchen das Abwasser innerhalb eines Beckens durch ein Sieb gepumpt wird.The feed pump according to the invention combines pumping and sieving devices in one device in a space-saving manner, wherein additional energy can be saved if the feed pump according to the invention replaces so-called active sieving devices in which the waste water is pumped through a sieve within a basin.
- 11
- FörderschneckeAuger
- 22nd
- Rohrpipe
- 2a2a
- stirnseitige Öffnungfront opening
- 2b2 B
- stirnseitigen Öffnung, Austrittsöffnungfront opening, outlet opening
- 2c2c
- AussparungRecess
- 33rd
- Abschnittsection
- 44th
- Abschnittsection
- 55
- AntriebsvorrichtungDrive device
- 66
- SiebwandScreen wall
- 77
- RohrabschnittPipe section
- 99
- Wellewave
- 1010th
- tief gelegenes Beckendeep pool
- 1111
- höher gelegenes Beckenhigher pool
- 1212th
- ContainerContainer
Claims (5)
- A conveyor pump for sewage, in particular in sewage-treatment plants, comprising a conveyor screw (1) which is arranged rotatably in an inclined conveyor tube (2) or a conveyor trough, at the downward end of which there is a feed opening (2a) and at the higher end of which there is a discharge opening (2b), wherein a sieve (6) is provided at the higher portion (4) of the conveyor tube or trough (2) and is arranged in such a way that at least a part of the upwardly conveyed sewage is discharged by way of the sieve (6), wherein in the upper portion of the conveyor tube or trough (2) at least a part of the bottom surface of the conveyor tube or trough (2) is formed by a sieve (6) and wherein there is provided a separate discharge opening which is independent of the sieve.
- A conveyor pump according to claim 1 characterized in that the sieve (6) is arranged between the conveyor screw (1) and the discharge opening (2b).
- a conveyor pump according to one of claims 1 and 2 characterized in that disposed as a continuation of the upper portion (4) of the conveyor tube (2) is a pressing portion (7) comprising a narrowed or narrowing and portion of the conveyor tube (2), into which extends the conveyor screw (1) which is reduced to a corresponding cross-section.
- A conveyor pump according to claim 3 characterized in that the conveyor screw has a reduced flight height in the pressing portion (7).
- A conveyor pump according to claim 3 or claim 4 characterized in that the pressing portion (7) has an end outlet opening (8).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4202967A DE4202967A1 (en) | 1992-02-01 | 1992-02-01 | CONVEYOR PUMP WITH SCREEN DEVICE |
| DE4202967 | 1992-02-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0554740A1 EP0554740A1 (en) | 1993-08-11 |
| EP0554740B1 true EP0554740B1 (en) | 1995-09-27 |
Family
ID=6450824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93101048A Expired - Lifetime EP0554740B1 (en) | 1992-02-01 | 1993-01-24 | Pump with filtering device |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0554740B1 (en) |
| AT (1) | ATE128515T1 (en) |
| DE (2) | DE4202967A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4332268A1 (en) * | 1993-09-23 | 1995-03-30 | Geiger Maschf Helmut | Cleaning device for cleaning water flowing in a channel |
| DE19520992C2 (en) * | 1995-06-08 | 1999-08-12 | Premark Feg L L C N D Ges D St | Device and method for removing waste from water |
| DE10100534B4 (en) * | 2001-01-05 | 2004-05-19 | Stefan Barth | End of orbit, oscillating, rising incline |
| DE102019007315B3 (en) * | 2019-10-21 | 2020-11-05 | Stefan Barth | Combination rotation lever with screw conveyor for small hydropower plants |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2929504A (en) * | 1958-05-19 | 1960-03-22 | Chain Belt Co | Waste-flow screening apparatus |
| CH458938A (en) * | 1967-10-04 | 1968-06-30 | Giroud Olma Ag | Screw pump |
| GB1257503A (en) * | 1969-06-07 | 1971-12-22 | ||
| US3938434A (en) * | 1973-03-19 | 1976-02-17 | Cox Clyde H | Sludge dewatering |
| DE3006057C2 (en) * | 1980-02-18 | 1982-08-26 | Schreiber-Kläranlagen Dr.-Ing. Aug. Schreiber GmbH & Co KG, 3012 Langenhagen | Screw pump with lower suspension |
| DE3630755A1 (en) * | 1986-09-10 | 1988-03-24 | Huber Hans Georg | DEVICE FOR THE REMOVAL OF SCREEN AND / OR SCREENED GOODS FROM A LIQUID FLOWING |
| DE8905963U1 (en) * | 1989-05-12 | 1989-08-10 | Noggerath & Co, 3061 Ahnsen | Device for removing screenings and/or sievings from a channel of flowing liquid |
| DE3920196A1 (en) * | 1989-06-21 | 1991-01-10 | Huber Hans Georg Dipl Ing | Trash-removal equipment from gutter - has inclined cylindrical grille of smaller free cross=section at bottom end |
| DE3942561C1 (en) * | 1989-08-22 | 1991-01-10 | Hans-Georg Dipl.-Ing. 8434 Berching De Huber | |
| DE9100126U1 (en) * | 1990-03-14 | 1991-03-28 | Noggerath & Co, 3061 Ahnsen | Device for removing screenings and/or sievings from a channel of flowing liquid |
-
1992
- 1992-02-01 DE DE4202967A patent/DE4202967A1/en not_active Withdrawn
-
1993
- 1993-01-24 EP EP93101048A patent/EP0554740B1/en not_active Expired - Lifetime
- 1993-01-24 AT AT93101048T patent/ATE128515T1/en not_active IP Right Cessation
- 1993-01-24 DE DE59300639T patent/DE59300639D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59300639D1 (en) | 1995-11-02 |
| ATE128515T1 (en) | 1995-10-15 |
| EP0554740A1 (en) | 1993-08-11 |
| DE4202967A1 (en) | 1993-08-05 |
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