Title of Invention	DEVICE FOR REMOVING MATERIAL TO BE SCREENED FROM A LIQUID FLOWING IN A CHANNEL
Abstract	The invention raises to a device for removing material to be screened from a liquid (2) flowing in a channel (1), Tte device comprises an inched, ralatettdy drioven. cylindrical sieve grate (6) which is partially submerged in the liquid and has an open front side (6) on Ihe inflow site thereof and guide plates (15) on the inner side thereof. The device is provided with a screw conveyor (23) comprising a housing (24) and 3 driven conveying screw (25), the screw conveyor being coaxially arranged in relation to the sieve grate (6) and leading to a discharge point (29) outside the liquid. The screw conveyor (23) comprises a feeding hopper (19) for the material to be screened, in the region of the sieve grate (6). A fixed detaching device (16) for detaching the material to be screened adhering to a separation surface (14) inside the sieve grate (6) is provided on the outer side of the sieva grate (6), above the feeding hopper (19). The sieve grate (6) comprises a shaping carrier element (13) and a mesh fabric (7) forming a separation surface (14). The feeding hopper (19] is pierced on the bottom side.The guideplates (15) are placed against the seperation surface (14) of the mesh fabric (7) in an axially nparallel manner. the mesh fabric (7) in an axially parallel manner.

Title of Invention

DEVICE FOR REMOVING MATERIAL TO BE SCREENED FROM A LIQUID FLOWING IN A CHANNEL

Abstract

The invention raises to a device for removing material to be screened from a liquid (2) flowing in a channel (1), Tte device comprises an inched, ralatettdy drioven. cylindrical sieve grate (6) which is partially submerged in the liquid and has an open front side (6) on Ihe inflow site thereof and guide plates (15) on the inner side thereof. The device is provided with a screw conveyor (23) comprising a housing (24) and 3 driven conveying screw (25), the screw conveyor being coaxially arranged in relation to the sieve grate (6) and leading to a discharge point (29) outside the liquid. The screw conveyor (23) comprises a feeding hopper (19) for the material to be screened, in the region of the sieve grate (6). A fixed detaching device (16) for detaching the material to be screened adhering to a separation surface (14) inside the sieve grate (6) is provided on the outer side of the sieva grate (6), above the feeding hopper (19). The sieve grate (6) comprises a shaping carrier element (13) and a mesh fabric (7) forming a separation surface (14). The feeding hopper (19] is pierced on the bottom side.The guideplates (15) are placed against the seperation surface (14) of the mesh fabric (7) in an axially nparallel manner. the mesh fabric (7) in an axially parallel manner.

Full Text	The invention relates to a device for removing material to be screened from a liquid (2) flowing in a channel, the device comprising an inclined, rotatably driven, cylindrical sieve grate which is partially submerged in the liquid and has an open front side on the inflow side thereof and guide plates on the inner side thereof, the device being provided with a screw conveyor comprising a housing and a driven conveying screw, the screw conveyor being coaxially arranged in relation to the sieve grate and leading to a discharge point outside the liquid, the screw conveyor comprising a feeding hopper for the material to be screened, in the region of the sieve grate, wherein a fixed detaching device for detaching the material to be screened adhering to a separation surface inside the sieve grate is provided on the outer side of the sieve grate, above the feeding hopper. Such devices having a rotatably driven sieve grate include holes or slits on the cylindrical surface having a size of about 4 to 12 mm. Consequently, especially rakings can be taken out of a liquid flowing in a channel. Fine components as sludge or the like cannot be treated with such a device. Fibrous material remains in the channel also often giving rise to clogging-up and even to breakdowns in the operation. PRIOR ART A device of the type mentioned above is known from DE 34 20 157 C1. The device includes a cylindrical sieve grate which is partially submerged in the liquid with its axis in inclined manner, the grate having a hydraulically open front side on the inflow side thereof and a hydraulically substantially closed back side on the outflow side thereof. The sieve grate comprises a perforation of slits forming a separation surface on the inner side, while the liquid penetrates the slits and remains in the channel. The cylindrical sieve grate is rotatably driven in connection with a screw conveyor. The screw conveyor has a feeding hopper being coaxially arranged in bearings with respect to the sieve grate. The screw conveyor includes a - 2 - housing and a conveying screw. A fixed detaching device in form of a brush roll or a spray rail for water for detaching the material to be raked and/or screened adhering to the separation surface inside the sieve grate is provided on the outer side of the sieve grate, above the feeding hopper. The rakings fall in the feeding hopper being the first element of the screw conveyor and is upwardly conveyed to the discharge point outside and above the liquid. The cylindrical sieve grate comprises spiral guide plates arranged on the inner side of the grate having the function to convey upwardly especially larger rakings and to hinder them from falling back during rotation of the sieve grate. The openings of the perforation of the sieve grate may be designed to have a size from a number of millimetres to about 10 mm. Smaller openings cannot be produced economically. Consequently, the known device cannot be used to treat sludge-like screenings. A device for removing material to be raked and/or screened from a liquid flowing in a channel is known from DE 36 30 755 C2. The device includes a driven cylindrical sieve grate being positioned in inclined manner in the channel. A screw conveyor leads from a feeding hopper being arranged near the sieve grate to a discharge point outside the channel. The sieve grate comprises a number of ring-like discs being arranged side by side with distance to each other in order to form slits. A stripper bar forming a detaching device is positioned inside the sieve grate above the feeding hopper. The feeding hopper includes a wall upwardly extending to the stripper bar. The stripper bar may be positioned on the outside of the sieve grate also extending inwardly through the slits between the ring-like discs. There are constructive limits in the design due to the formation of the openings of the sieve grate in form of the number of ring-like discs. Consequently, this device can be used to remove rakings rather than screenings. Sludge cannot be screened using this device. OBJECT OF THE INVENTION The object of the present invention is to provide a device of the kind described above which is adapted to screen sludge to be removed from a liquid flowing in a channel. Fabrics and other screenings of small dimension shall be removed also. THE INVENTION In accordance with the invention that is achieved with the features of claim 1. - 3 - DESCRIPTION OF THE INVENTION The invention deviates from the prior art concerning sieve grates made from a cylindrically bent sheet metal having openings in the shape of slits or holes or made from ring-like discs being arranged side by side with distance to each other. The sieve grate is designed to have two elements, one being a mesh fabric forming the separation surface on its inner side to deposit the sludge-like screenings. Such a mesh fabric is a very economical possibility to realize the openings of the separation surface to have a different size compared with the possibilities given by forming slits between ring-like discs or to arrange holes or bores in sheet metal. Each mesh of a mesh fabric has a constant cross section area. A mesh fabric can be produced easily to have the proper dimensioning of openings of such sizes necessary to remove sludge-like screenings. The openings may be designed to be very small and uniform. Sizes of parts of millimetres are realistic. On the other hand such a mesh fabric has certain instability to hold a constant diameter of the sieve grate. The mesh fabric is assisted by a shaping carrier element or supported by them respectively making the cylindrical shape of the sieve grate to be permanent. It is evident that the shaping carrier element has larger openings than the mesh fabric to be penetrated by the liquid. These opening are of no importance concerning the separation surface of the mesh fabric. A fixed detaching device for detaching the material to be screened adhering to a separation surface inside the sieve grate is provided outside the circumference of the sieve grate and outside the liquid level in the channel. The detaching device should include a spray rail to remove the material to be screened adhering to the separation surface inside the sieve grate and being conveyed upwardly during rotation of the sieve grate and being thrown into the feeding hopper. Doing this spray water enters the feeding hopper also. Liquid from the channel is conveyed upwardly also when conveying the screenings, the liquid entering the feeding hopper also. The screenings deposited with the mesh fabric on the separation surface agglomerates by the use of a spray rail being the detaching device and enters the feeding hopper. The feeding hopper has to have openings arranged in its bottom part to achieve a pre-dewatering in the feeding hopper. The liquid from the pressing zone of the screw conveyor is conveyed back into the channel through these openings also. The separation surface is completed by guide plates. The guide plates are designed to form troughs to convey the mixture of screenings and liquid upwardly. The guide plates are divided by separation walls arranged along the length of the plates to form singles conveying - 4 - troughs. A wall can be arranged at the end of the guide plates also. Consequently, single portions of the mixture of liquid and screenings are upwardly conveyed. Liquid flows out of the single troughs giving an increase of concentration of screenings. In an especially easy embodiment the guide plates being arranged in sealed manner with respect to the separation surface are no longer spiralic but arranged in parallel to the axis and with respect to the inner circumference of the separation surface thus forming shovel-like troughs conveying the screenings upwardly during rotation of the sieve grate. The single troughs of a guide plate one after the other emerge the liquid level in the channel due to the inclined arrangement of the axis of the device. The liquid emerges the mesh fabric below and above the liquid level in the channel resulting in a concentrating of the screenings in the troughs. There occurs a further concentration of the screenings during upwardly conveying due to the change of the liquid level of the mixture of liquid and screenings in the troughs and due to the decrease of volume provided by the troughs. This concentration of the material to be screened is necessary to treat such sludge material. However, -it is possible also to arrange the guide plates not in parallel to the axis but in parallel to the liquid level in the channel with respect to the separation surface. Doing this the separation walls can be avoided. However the end walls are necessary and the angle of arrangement of the device in the channel is fixed. If the angle of the arrangement of the device in the channel should be variable then the separation walls are necessary to form single trough-like chambers on the guide plates. The conveying screw of the screw conveyor may be provided with brushes in the region of the sieve grate, the brushes stroking the pierced feeding hopper. The brushes are positioned on the outer circumference of the conveying screw and have the function to clean again and again the openings arranged in the bottom part of the feeding hopper during operation of the device to achieve a constant pre-dewatering of the deposited screenings. The device can be operated discontinuously also in order to reach a certain deposition of material on the separation surface of the mesh fabric during standstill periods of the sieve grate. Doing this a certain damming of the liquid occurs in the channel and a greater part of the separation surface of the sieve grate is used even though the sieve grate with its axis is arranged in inclined manner in the channel. A part of the bottom of the feeding hopper being perforated is arranged below the liquid level in the channel. This perforated bottom is used for depositing purposes also. During time periods in which the sieve grate is driven in rotation a cleaning action of the perforated bottom of the feeding hopper takes place again in connection with a decrease of damming of the liquid in the channel. - 5 - The guide plates may be designed to be open on the side not facing the mesh fabric with respect to the separation surface. The openings may be designed to be comb-like or to be composed of bores, slits or the like. Especially liquid penetrates these openings when the guide plates are upwardly moved during rotation of the sieve grate prior to reaching the detaching device. A concentration of the deposited sludge-like screenings occurs due to this design. The shaping carrier element may be realized in different manner. A supporting fabric may be provided having comparatively larger meshes but holding the shape after bending operation and causing the mesh fabric to hold its shape. The mesh fabric can be fixed with the supporting fabric in areas or point-like connections. However, it is possible also to use a basket having arms and struts for the shaping carrier element also, the basket being designed to receive the mesh fabric along its inner circumferential surface. The detaching device should comprise nozzles to spray water and/or compressed air. One or more spray rails may be arranged in parallel to the surface line of the cylindrical sieve grate. The nozzles have the function that the shaping carrier element is penetrated by the spray water and/ort he compressed air resulting in a loosening of the deposited screenings from the separation surface and a throwing in the feeding hopper. The feeding hopper in axial direction may be designed to be offset or longer than the axial extension of the sieve grate as to the inclined arrangement of the axis of the device. Doing this, the feeding hopper extends through the open front side of the sieve grate in a certain amount. However it is possible also to position an upwardly extending end wall on the feeding hopper avoiding the axial offset. The side walls of the feeding hopper may be arranged also to extend upwardly even up to the inner surface of the sieve grate due to the fact that the detaching device is positioned outside the sieve grate. The mesh fabric may be especially a square meshes fabric having a mesh aperture between 0,2 and 1,2 mm. Such square mesh fabrics may be manufactured economically on looms. The mesh aperture may be held constant in narrow regions and allows an individual adaptation with respect to the size of the particles of the sludge-like screenings. Consequently, screenings in form of fibres, hairs and the like can be removed without difficulty. The feeding hopper perforated on its bottom may have bores with a diameter of about 2 mm. Surprisingly, bores of this size do not hinder to screen sludge-like material. The screenings deposited with the fine mesh fabric will agglomerate during detaching and enters the feeding hopper. Bores of this size are very effective to reach an improved pre-dewatering in the feeding hopper. The number of the guide plate forming the troughs over the separation surface may be chosen and is not critical. An adaptation with respect to the consistence of the sludge is individually possible. In many cases it is sufficient to arrange three guide plates over the separation surface. The guide plates have to be arranged with equal distance to each other. SHORT DESCRIPTION OF THE DRAWINGS Preferred embodiments of the present invention are shown in the drawings and explained in the following. Fig. 1 schematically shows a side view of the entire device arranged in a channel. Fig. 2 shows a detail of the device in enlarged scale near the driven sieve grate. Fig. 3 shows a cross sectional view according the line Ill-Ill of Fig. 2. Fig. 4 shows a cross sectional view in enlarged scale and a top view of the sieve grate composed of a mesh fabric and a supporting fabric. Fig. 5 shows an illustration similar to that of Fig. 3 but using a basket having arms as shaping carrier element. Fig. 6 shows a top view of the sieve grate of Fig. 5. Fig. 7 shows a further embodiment of the device. D E S C R IP T I O N O F T H E D R A W I N G S Fig. 1 shows a part of a channel 1, in which a liquid 2 contaminated with material to be screened and having a water level 3 is flowing in the direction of arrow 4. The device is located in the channel with its axis 5 being arranged in a inclined manner, the angle of inclination preferably having 35°. The device includes a cylindrical sieve grate 6, the main part of which is a mesh fabric 7. The sieve grate 6 has an open front side 8 on the inflow side thereof, the contaminated liquid flowing through the open front side into the interior of the sieve grate 6. A sealed and thus hydraulically closed back side 9 is provided downstream. The sieve grate 6 is rotatably arranged near the back side 9 and sealed with respect to elements not rotating. The sieve grate 6 is rotatably driven around its axis 5. The drive is designed to be especially discontinuous, meaning that time periods of rotation and time periods of standstill are following each other. A motor 11 serves for the drive 10 possibly including a gear 12. The sieve grate 6 besides the mesh fabric 7 includes a shaping carrier element 13. The mesh fabric 7 is located on the inner surface of the carrier element 13. It is the function of the carrier element 13 to permanently guarantee the cylindrical shape of the sieve grate 6 and to take forces. The inner cylindrical surface of the mesh fabric 7 forms a separation surface 14. The separation surface 14 is completed by guide plates 15 being located possibly in parallel with respect to the axis 5 of the device or to a surface line of the cylindrical sieve grate 6 respectively. The guide plates 15 are in sealing contact to the separation surface 14 and are separated by separation walls 39 and at least closed at one end by an end wall 40. The troughs designed in this manner rotate with the sieve grate 6 and thus form trough-like chambers moving from below the water level 3 to upwardly out of the water level 3 while rotating and conveying the material to be screened. A detaching device 16 is provided above the water level 3 and above the sieve grate 6, the detaching device including a spray rail 17 having nozzles 18. Water is sprayed with the detaching device 16 from outside through the openings of the carrier element 13 and the openings in the mesh fabric 7 so that the material to be deposited on the inner surface of the mesh fabric is detached and reaches a feeding hopper 19 under the influence of gravitational force and/or the forces of the sprayed water. The feeding hopper 19 is arranged in fixed manner and in parallel to the axis 5 of the device and preferably concentrically with respect to the sieve grate 6. The detaching device may be designed to operate with spray water - 8 - and/or pressurized air. The feeding hopper 19 comprises a hopper wall 20 upwardly extending and side walls 21, both being arranged with respect to the open front side 8 of the sieve grate 6. The feeding hopper 19 includes openings 22 on the bottom side, possibly having a diameter of up to 2 mm. A screw conveyor 23 is located coaxially to the axis 5 of the entire device and thus to the sieve grate 6 also, the screw conveyor 23 including a housing 24 and a conveying screw 25 positioned therein. A shaft 26 running through and carrying the conveying screw 25 extends from the motor 11 and the gear respectively through the whole housing 24 and projects in axial direction with respect to the housing 24. The conveying screw 25 cooperates with the feeding hopper 19 in this region. Here, the conveying screw 25 may be provided with brushes not shown for clarity reason, the brushes stroking the pieced bottom wall of the feeding hopper 19 and thus cleaning and uncovering the openings 22 again and again. The motor 11 drives the conveying screw 25 of the screwing conveyor 23 via the shaft 26. The motor 11 serves to rotate the sieve grate 6 also. A drive arm 27 may be provided fort his function, the drive arm being in fixed connection with the shaft 26 and the sieve grate 6 also, especially with its carrier element 13. The area between the sieve grate 6 and the walls of the channel 1 is sealingly closed by a planking sheet metal 28, so that the contaminated liquid is forced to enter the interior of the cylindrical sieve grate 6 via the open front side 8. The liquid flows through openings in the mesh fabric 7 and remains in the channel while the material to be deposited is deposited on the inner surface of the mesh fabric 7 and is conveyed upwardly by the sieve grate during rotation. The material after releasing by the detaching device 16 enters the feeding hopper 19 and thus reaches the screwing conveyor 23. It is upwardly conveyed and reaches a discharge point 29 for example in a container 30. A pressing zone 31 may be arranged in the upper region of the screwing conveyor 23 further dewatering the material to be deposited and conveyed prior to reaching the discharge point. A conduit 32 leads the liquid of the pressing zone 31 back into the channel 1. Fig. 2 in enlarged scale indicates again the design of the sieve grate 6. The inner circumference of the sieve grate 6 carrying the mesh fabric 7 forming the separation surface 14 is shown. It may be recognized also that the guide plates 15 extend in parallel to the axis and are arranged in inclined manner with respect to the separation surface 14 of the mesh fabric 7. The guide plates 15 on its free side not facing the separation surface 14 comprise - 9 - openings 33, the openings here being designed in a comb-like manner. The openings 33 may have the form of bores also being provided in this region of the guide plates 15. Consequently, a permanent dewatering occurs during the upwardly directed conveying motion of the material to be screened in the through-like chambers. The levels of the liquids in the chambers vary and liquid passes the comb-like openings 33 or the bores and flows back to the channel. Fig. 3 once again indicates the design according line III-III of Fig. 2. The feeding hopper 19 is easily to be seen. The feeding hopper includes a side wall 21 which may have openings 41 arranged in the lower region being arranged in addition to the openings 22 of the bottom of the feeding hopper 19. The openings 41 usefully may have a larger diameter than the openings 22 arranged in the region of the bottom. The arrangement of three guiding plates 15 is to be seen, the guiding plates being produced as straight elements and being arranged in parallel with respect to the axis 5 of the device. Fig. 4 in enlarged scale indicates on the one hand the mesh fabric 7 and the carrier element 13 here having the function of a supporting fabric 34. The supporting fabric 34 ensures the shape and is designed to be relatively rigid so that it remains its shape and provides the stability of the sieve grate 6 when cylindrically bent. The mesh fabric 37 is a square meshes fabric 35 having a mesh aperture 36 between 0,2 and 1,2 mm depending on the application. The interior of the square mesh fabric 35 fulfils the function of the separating surface 14. A further embodiment of the sieve grate 6 is shown in Figs. 5 and 6. A basket 37 having arms gives the function of the shaping carrier element 13, the struts 38 of which are arranged in relation parallel to the axis and shown in highlighting. It is evident that the struts 38 are held with circular extending supporting elements not shown. Here also, the inner circumference of the basket 37 or the carrier element 13 is coated with the mesh fabric 7. Here also the region of the bottom of the feeding hopper 19 may be designed as a perforated plate having the openings 22. In addition, the openings 41 shown in Fig. 3 may be arranged in the hopper wall 20. Fig. 7 shows a further embodiment of the device, being similar to the embodiment of Fig. 2 in a number of details. The guide plates 15 are designed to be bent elements arranged in inclined manner with respect to the horizontal direction and thus not in parallel to the interior circumference of the sieve grate 6 in sealed relation. Bores 42 may be arranged near the rim - 10 - instead of a comb-like shape of the guide plates 15. It is evident that a number of guide plates 15 may be arranged evenly distributed about the circumference. Only one guide plate 15 is shown for clarity. The level of the liquid of each single trough-like chamber will vary during rotation of the sieve grate 6 and permanently change. Dewatering takes place in this manner and liquid permanently flows back to the channel. One or more additional spray rails 43 are shown in Fig. 7, the spray rails being positioned below the perforated plate having the openings 22. These spray rails 43 include nozzles 44 also and may be operated with spraying water and/or pressurized air. The spray rails 43 may be used in addition or alternatively to the brushes being positioned on the inside of the rim of the conveying screw in the region of the feeding hopper 19. The spray rails 43 serve or increase respectively the cleaning of the openings 22 of the perforated plate of the feeding hopper 19. Preferably, the spray rails and the entire device may be operated discontinuously, however in those time periods in which the water level 3 in the channel 1 has fallen below a lower level as shown after cleaning of the sieve grate 6. The details shown in the drawings may be combined with each other in useful manner within the scope of the present invention. - 11 - LIST OF REFERENCE NUMERALS 1 Channel 11 motor 2 Liquid 12 gear 3 water level 13 carrier element 4 Arrow 14 separation surface 5 Axis 15 guide plate 6 sieve grate 16 detaching device 7 mesh fabric 17 spray rail 8 front side 18 nozzle 9 back side 19 feeding hopper 10 Drive 20 hopper wall 21 side wall 31 pressing zone 22 Opening 32 conduit 23 screw conveyor 33 opening 24 Housing 34 supporting fabric 25 conveying screw 35 fabric with square meshes 26 Shaft 36 mesh aperture 27 drive arm 37 basket with arms 28 planking sheet metal 38 strut 29 discharge point 39 separation wall 30 Container 40 end wall 41 Opening 42 Bore 43 spray rail 44 Nozzle - 12 - We claim :- 1. A device for removing material to be screened from a liquid (2) flowing in a channel (1), the device comprising an inclined, rotatably driven, cylindrical sieve grate (6) which is partially submerged in the liquid and has an open front side (8) on the inflow side thereof and guide plates (15) on the inner side thereof, the device being provided with a screw conveyor (23) comprising a housing (24) and a driven conveying screw (25), the screw conveyor being coaxially arranged in relation to the sieve grate (6) and leading to a discharge point (29) outside the liquid, the screw conveyor (23) comprising a feeding hopper (19) for the material to be screened, in the region of the sieve grate (6), wherein a fixed detaching device (16) for detaching the material to be screened adhering to a separation surface (14) inside the sieve grate (6) is provided on the outer side of the sieve grate (6), above the feeding hopper (19), characterized in that the sieve grate (6) comprises a shaping carrier element (13) and a mesh fabric (7) forming a separation surface (14), that the feeding hopper (19) is pierced on the bottom side and in that the guide plates (15) are placed against the separation surface (14) of the mesh fabric (7) in an axially parallel manner. 2. Device of claim 1, characterized in that the conveying screw (25) of the screw conveyor (23) is provided with brushes in the region of the sieve grate (6), the brushes stroking the pierced feeding hopper (19). 3. Device of 1 or 2, characterized in that the guide plates (15) are designed to be especially comb-like open on the side not facing the mesh fabric (7). 4. Device of one of the claims 1 to 3, characterized in that the shaping carrier element (13) is provided in form of a supporting fabric (34). 5. Device of one of the claims 1 to 3, characterized in that the shaping carrier element (13) is provided in form of a basket (37) having arms. 6. Device of one of the claims 1 to 5, characterized in that the detaching device (16) comprises nozzles (18) to spray water and/or compressed air. - 13 - - 14 - 7. Device of one of the claims 1 to 6, characterized in that the feeding hopper (19) comprises a upwardly extending wall (20) being arranged in the region of the open front side (8) of the sieve grate (6). 8. Device of one of the claims 1 to 7, characterized in that the mesh fabric (7) is a square meshes fabric (35) having a mesh aperture (36) between 0,2 and 1,2 mm. 9. Device of one of the claims 1 to 8, characterized in that the feeding hopper (19) being pierced on the bottom side includes bores having a diameter of about 2 mm. 10. Device of one of the claims 1 to 9, characterized in that three guide plates (15) are arranged with respect to the separation surface (14). The invention raises to a device for removing material to be screened from a liquid (2) flowing in a channel (1), Tte device comprises an inched, ralatettdy drioven. cylindrical sieve grate (6) which is partially submerged in the liquid and has an open front side (6) on Ihe inflow site thereof and guide plates (15) on the inner side thereof. The device is provided with a screw conveyor (23) comprising a housing (24) and 3 driven conveying screw (25), the screw conveyor being coaxially arranged in relation to the sieve grate (6) and leading to a discharge point (29) outside the liquid. The screw conveyor (23) comprises a feeding hopper (19) for the material to be screened, in the region of the sieve grate (6). A fixed detaching device (16) for detaching the material to be screened adhering to a separation surface (14) inside the sieve grate (6) is provided on the outer side of the sieva grate (6), above the feeding hopper (19). The sieve grate (6) comprises a shaping carrier element (13) and a mesh fabric (7) forming a separation surface (14). The feeding hopper (19] is pierced on the bottom side.The guideplates (15) are placed against the seperation surface (14) of the mesh fabric (7) in an axially nparallel manner. the mesh fabric (7) in an axially parallel manner.

Full Text

The invention relates to a device for removing material to be screened from a liquid (2)
flowing in a channel, the device comprising an inclined, rotatably driven, cylindrical sieve
grate which is partially submerged in the liquid and has an open front side on the inflow side
thereof and guide plates on the inner side thereof, the device being provided with a screw
conveyor comprising a housing and a driven conveying screw, the screw conveyor being
coaxially arranged in relation to the sieve grate and leading to a discharge point outside the
liquid, the screw conveyor comprising a feeding hopper for the material to be screened, in
the region of the sieve grate, wherein a fixed detaching device for detaching the material to
be screened adhering to a separation surface inside the sieve grate is provided on the outer
side of the sieve grate, above the feeding hopper. Such devices having a rotatably driven
sieve grate include holes or slits on the cylindrical surface having a size of about 4 to 12 mm.
Consequently, especially rakings can be taken out of a liquid flowing in a channel. Fine
components as sludge or the like cannot be treated with such a device. Fibrous material
remains in the channel also often giving rise to clogging-up and even to breakdowns in the
operation.
PRIOR ART
A device of the type mentioned above is known from DE 34 20 157 C1. The device includes
a cylindrical sieve grate which is partially submerged in the liquid with its axis in inclined
manner, the grate having a hydraulically open front side on the inflow side thereof and a
hydraulically substantially closed back side on the outflow side thereof. The sieve grate
comprises a perforation of slits forming a separation surface on the inner side, while the
liquid penetrates the slits and remains in the channel. The cylindrical sieve grate is rotatably
driven in connection with a screw conveyor. The screw conveyor has a feeding hopper being
coaxially arranged in bearings with respect to the sieve grate. The screw conveyor includes a
- 2 -

housing and a conveying screw. A fixed detaching device in form of a brush roll or a spray
rail for water for detaching the material to be raked and/or screened adhering to the
separation surface inside the sieve grate is provided on the outer side of the sieve grate,
above the feeding hopper. The rakings fall in the feeding hopper being the first element of
the screw conveyor and is upwardly conveyed to the discharge point outside and above the
liquid. The cylindrical sieve grate comprises spiral guide plates arranged on the inner side of
the grate having the function to convey upwardly especially larger rakings and to hinder them
from falling back during rotation of the sieve grate. The openings of the perforation of the
sieve grate may be designed to have a size from a number of millimetres to about 10 mm.
Smaller openings cannot be produced economically. Consequently, the known device cannot
be used to treat sludge-like screenings.
A device for removing material to be raked and/or screened from a liquid flowing in a channel
is known from DE 36 30 755 C2. The device includes a driven cylindrical sieve grate being
positioned in inclined manner in the channel. A screw conveyor leads from a feeding hopper
being arranged near the sieve grate to a discharge point outside the channel. The sieve
grate comprises a number of ring-like discs being arranged side by side with distance to
each other in order to form slits. A stripper bar forming a detaching device is positioned
inside the sieve grate above the feeding hopper. The feeding hopper includes a wall
upwardly extending to the stripper bar. The stripper bar may be positioned on the outside of
the sieve grate also extending inwardly through the slits between the ring-like discs. There
are constructive limits in the design due to the formation of the openings of the sieve grate in
form of the number of ring-like discs. Consequently, this device can be used to remove
rakings rather than screenings. Sludge cannot be screened using this device.
OBJECT OF THE INVENTION
The object of the present invention is to provide a device of the kind described above which
is adapted to screen sludge to be removed from a liquid flowing in a channel. Fabrics and
other screenings of small dimension shall be removed also.
THE INVENTION
In accordance with the invention that is achieved with the features of claim 1.
- 3 -

DESCRIPTION OF THE INVENTION
The invention deviates from the prior art concerning sieve grates made from a cylindrically
bent sheet metal having openings in the shape of slits or holes or made from ring-like discs
being arranged side by side with distance to each other. The sieve grate is designed to have
two elements, one being a mesh fabric forming the separation surface on its inner side to
deposit the sludge-like screenings. Such a mesh fabric is a very economical possibility to
realize the openings of the separation surface to have a different size compared with the
possibilities given by forming slits between ring-like discs or to arrange holes or bores in
sheet metal. Each mesh of a mesh fabric has a constant cross section area. A mesh fabric
can be produced easily to have the proper dimensioning of openings of such sizes necessary
to remove sludge-like screenings. The openings may be designed to be very small and
uniform. Sizes of parts of millimetres are realistic. On the other hand such a mesh fabric has
certain instability to hold a constant diameter of the sieve grate. The mesh fabric is assisted
by a shaping carrier element or supported by them respectively making the cylindrical shape
of the sieve grate to be permanent. It is evident that the shaping carrier element has larger
openings than the mesh fabric to be penetrated by the liquid. These opening are of no
importance concerning the separation surface of the mesh fabric.
A fixed detaching device for detaching the material to be screened adhering to a separation
surface inside the sieve grate is provided outside the circumference of the sieve grate and
outside the liquid level in the channel. The detaching device should include a spray rail to
remove the material to be screened adhering to the separation surface inside the sieve grate
and being conveyed upwardly during rotation of the sieve grate and being thrown into the
feeding hopper. Doing this spray water enters the feeding hopper also. Liquid from the
channel is conveyed upwardly also when conveying the screenings, the liquid entering the
feeding hopper also. The screenings deposited with the mesh fabric on the separation
surface agglomerates by the use of a spray rail being the detaching device and enters the
feeding hopper. The feeding hopper has to have openings arranged in its bottom part to
achieve a pre-dewatering in the feeding hopper. The liquid from the pressing zone of the
screw conveyor is conveyed back into the channel through these openings also.
The separation surface is completed by guide plates. The guide plates are designed to form
troughs to convey the mixture of screenings and liquid upwardly. The guide plates are
divided by separation walls arranged along the length of the plates to form singles conveying
- 4 -

troughs. A wall can be arranged at the end of the guide plates also. Consequently, single
portions of the mixture of liquid and screenings are upwardly conveyed. Liquid flows out of
the single troughs giving an increase of concentration of screenings. In an especially easy
embodiment the guide plates being arranged in sealed manner with respect to the separation
surface are no longer spiralic but arranged in parallel to the axis and with respect to the inner
circumference of the separation surface thus forming shovel-like troughs conveying the
screenings upwardly during rotation of the sieve grate. The single troughs of a guide plate
one after the other emerge the liquid level in the channel due to the inclined arrangement of
the axis of the device. The liquid emerges the mesh fabric below and above the liquid level in
the channel resulting in a concentrating of the screenings in the troughs. There occurs a
further concentration of the screenings during upwardly conveying due to the change of the
liquid level of the mixture of liquid and screenings in the troughs and due to the decrease of
volume provided by the troughs. This concentration of the material to be screened is
necessary to treat such sludge material. However, -it is possible also to arrange the guide
plates not in parallel to the axis but in parallel to the liquid level in the channel with respect to
the separation surface. Doing this the separation walls can be avoided. However the end
walls are necessary and the angle of arrangement of the device in the channel is fixed. If the
angle of the arrangement of the device in the channel should be variable then the separation
walls are necessary to form single trough-like chambers on the guide plates.
The conveying screw of the screw conveyor may be provided with brushes in the region of
the sieve grate, the brushes stroking the pierced feeding hopper. The brushes are positioned
on the outer circumference of the conveying screw and have the function to clean again and
again the openings arranged in the bottom part of the feeding hopper during operation of the
device to achieve a constant pre-dewatering of the deposited screenings. The device can be
operated discontinuously also in order to reach a certain deposition of material on the
separation surface of the mesh fabric during standstill periods of the sieve grate. Doing this a
certain damming of the liquid occurs in the channel and a greater part of the separation
surface of the sieve grate is used even though the sieve grate with its axis is arranged in
inclined manner in the channel. A part of the bottom of the feeding hopper being perforated is
arranged below the liquid level in the channel. This perforated bottom is used for depositing
purposes also. During time periods in which the sieve grate is driven in rotation a cleaning
action of the perforated bottom of the feeding hopper takes place again in connection with a
decrease of damming of the liquid in the channel.
- 5 -

The guide plates may be designed to be open on the side not facing the mesh fabric with
respect to the separation surface. The openings may be designed to be comb-like or to be
composed of bores, slits or the like. Especially liquid penetrates these openings when the
guide plates are upwardly moved during rotation of the sieve grate prior to reaching the
detaching device. A concentration of the deposited sludge-like screenings occurs due to this
design.
The shaping carrier element may be realized in different manner. A supporting fabric may be
provided having comparatively larger meshes but holding the shape after bending operation
and causing the mesh fabric to hold its shape. The mesh fabric can be fixed with the
supporting fabric in areas or point-like connections. However, it is possible also to use a
basket having arms and struts for the shaping carrier element also, the basket being
designed to receive the mesh fabric along its inner circumferential surface.
The detaching device should comprise nozzles to spray water and/or compressed air. One or
more spray rails may be arranged in parallel to the surface line of the cylindrical sieve grate.
The nozzles have the function that the shaping carrier element is penetrated by the spray
water and/ort he compressed air resulting in a loosening of the deposited screenings from
the separation surface and a throwing in the feeding hopper.
The feeding hopper in axial direction may be designed to be offset or longer than the axial
extension of the sieve grate as to the inclined arrangement of the axis of the device. Doing
this, the feeding hopper extends through the open front side of the sieve grate in a certain
amount. However it is possible also to position an upwardly extending end wall on the
feeding hopper avoiding the axial offset. The side walls of the feeding hopper may be
arranged also to extend upwardly even up to the inner surface of the sieve grate due to the
fact that the detaching device is positioned outside the sieve grate.
The mesh fabric may be especially a square meshes fabric having a mesh aperture between
0,2 and 1,2 mm. Such square mesh fabrics may be manufactured economically on looms.
The mesh aperture may be held constant in narrow regions and allows an individual
adaptation with respect to the size of the particles of the sludge-like screenings.
Consequently, screenings in form of fibres, hairs and the like can be removed without
difficulty.

The feeding hopper perforated on its bottom may have bores with a diameter of about 2 mm.
Surprisingly, bores of this size do not hinder to screen sludge-like material. The screenings
deposited with the fine mesh fabric will agglomerate during detaching and enters the feeding
hopper. Bores of this size are very effective to reach an improved pre-dewatering in the
feeding hopper.
The number of the guide plate forming the troughs over the separation surface may be
chosen and is not critical. An adaptation with respect to the consistence of the sludge is
individually possible. In many cases it is sufficient to arrange three guide plates over the
separation surface. The guide plates have to be arranged with equal distance to each other.
SHORT DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention are shown in the drawings and explained in
the following.
Fig. 1 schematically shows a side view of the entire device arranged in a channel.
Fig. 2 shows a detail of the device in enlarged scale near the driven sieve grate.
Fig. 3 shows a cross sectional view according the line Ill-Ill of Fig. 2.
Fig. 4 shows a cross sectional view in enlarged scale and a top view of the sieve
grate composed of a mesh fabric and a supporting fabric.
Fig. 5 shows an illustration similar to that of Fig. 3 but using a basket having arms as
shaping carrier element.
Fig. 6 shows a top view of the sieve grate of Fig. 5.
Fig. 7 shows a further embodiment of the device.

D E S C R IP T I O N O F T H E D R A W I N G S
Fig. 1 shows a part of a channel 1, in which a liquid 2 contaminated with material to be
screened and having a water level 3 is flowing in the direction of arrow 4. The device is
located in the channel with its axis 5 being arranged in a inclined manner, the angle of
inclination preferably having 35°. The device includes a cylindrical sieve grate 6, the main
part of which is a mesh fabric 7. The sieve grate 6 has an open front side 8 on the inflow side
thereof, the contaminated liquid flowing through the open front side into the interior of the
sieve grate 6. A sealed and thus hydraulically closed back side 9 is provided downstream.
The sieve grate 6 is rotatably arranged near the back side 9 and sealed with respect to
elements not rotating. The sieve grate 6 is rotatably driven around its axis 5. The drive is
designed to be especially discontinuous, meaning that time periods of rotation and time
periods of standstill are following each other. A motor 11 serves for the drive 10 possibly
including a gear 12.
The sieve grate 6 besides the mesh fabric 7 includes a shaping carrier element 13. The
mesh fabric 7 is located on the inner surface of the carrier element 13. It is the function of the
carrier element 13 to permanently guarantee the cylindrical shape of the sieve grate 6 and to
take forces. The inner cylindrical surface of the mesh fabric 7 forms a separation surface 14.
The separation surface 14 is completed by guide plates 15 being located possibly in parallel
with respect to the axis 5 of the device or to a surface line of the cylindrical sieve grate 6
respectively. The guide plates 15 are in sealing contact to the separation surface 14 and are
separated by separation walls 39 and at least closed at one end by an end wall 40. The
troughs designed in this manner rotate with the sieve grate 6 and thus form trough-like
chambers moving from below the water level 3 to upwardly out of the water level 3 while
rotating and conveying the material to be screened.
A detaching device 16 is provided above the water level 3 and above the sieve grate 6, the
detaching device including a spray rail 17 having nozzles 18. Water is sprayed with the
detaching device 16 from outside through the openings of the carrier element 13 and the
openings in the mesh fabric 7 so that the material to be deposited on the inner surface of the
mesh fabric is detached and reaches a feeding hopper 19 under the influence of gravitational
force and/or the forces of the sprayed water. The feeding hopper 19 is arranged in fixed
manner and in parallel to the axis 5 of the device and preferably concentrically with respect
to the sieve grate 6. The detaching device may be designed to operate with spray water
- 8 -

and/or pressurized air. The feeding hopper 19 comprises a hopper wall 20 upwardly
extending and side walls 21, both being arranged with respect to the open front side 8 of the
sieve grate 6. The feeding hopper 19 includes openings 22 on the bottom side, possibly
having a diameter of up to 2 mm.
A screw conveyor 23 is located coaxially to the axis 5 of the entire device and thus to the
sieve grate 6 also, the screw conveyor 23 including a housing 24 and a conveying screw 25
positioned therein. A shaft 26 running through and carrying the conveying screw 25 extends
from the motor 11 and the gear respectively through the whole housing 24 and projects in
axial direction with respect to the housing 24. The conveying screw 25 cooperates with the
feeding hopper 19 in this region. Here, the conveying screw 25 may be provided with
brushes not shown for clarity reason, the brushes stroking the pieced bottom wall of the
feeding hopper 19 and thus cleaning and uncovering the openings 22 again and again.
The motor 11 drives the conveying screw 25 of the screwing conveyor 23 via the shaft 26.
The motor 11 serves to rotate the sieve grate 6 also. A drive arm 27 may be provided fort his
function, the drive arm being in fixed connection with the shaft 26 and the sieve grate 6 also,
especially with its carrier element 13. The area between the sieve grate 6 and the walls of
the channel 1 is sealingly closed by a planking sheet metal 28, so that the contaminated
liquid is forced to enter the interior of the cylindrical sieve grate 6 via the open front side 8.
The liquid flows through openings in the mesh fabric 7 and remains in the channel while the
material to be deposited is deposited on the inner surface of the mesh fabric 7 and is
conveyed upwardly by the sieve grate during rotation. The material after releasing by the
detaching device 16 enters the feeding hopper 19 and thus reaches the screwing conveyor
23. It is upwardly conveyed and reaches a discharge point 29 for example in a container 30.
A pressing zone 31 may be arranged in the upper region of the screwing conveyor 23 further
dewatering the material to be deposited and conveyed prior to reaching the discharge point.
A conduit 32 leads the liquid of the pressing zone 31 back into the channel 1.
Fig. 2 in enlarged scale indicates again the design of the sieve grate 6. The inner
circumference of the sieve grate 6 carrying the mesh fabric 7 forming the separation surface
14 is shown. It may be recognized also that the guide plates 15 extend in parallel to the axis
and are arranged in inclined manner with respect to the separation surface 14 of the mesh
fabric 7. The guide plates 15 on its free side not facing the separation surface 14 comprise
- 9 -

openings 33, the openings here being designed in a comb-like manner. The openings 33
may have the form of bores also being provided in this region of the guide plates 15.
Consequently, a permanent dewatering occurs during the upwardly directed conveying
motion of the material to be screened in the through-like chambers. The levels of the liquids
in the chambers vary and liquid passes the comb-like openings 33 or the bores and flows
back to the channel.
Fig. 3 once again indicates the design according line III-III of Fig. 2. The feeding hopper 19 is
easily to be seen. The feeding hopper includes a side wall 21 which may have openings 41
arranged in the lower region being arranged in addition to the openings 22 of the bottom of
the feeding hopper 19. The openings 41 usefully may have a larger diameter than the
openings 22 arranged in the region of the bottom. The arrangement of three guiding plates
15 is to be seen, the guiding plates being produced as straight elements and being arranged
in parallel with respect to the axis 5 of the device.
Fig. 4 in enlarged scale indicates on the one hand the mesh fabric 7 and the carrier element
13 here having the function of a supporting fabric 34. The supporting fabric 34 ensures the
shape and is designed to be relatively rigid so that it remains its shape and provides the
stability of the sieve grate 6 when cylindrically bent. The mesh fabric 37 is a square meshes
fabric 35 having a mesh aperture 36 between 0,2 and 1,2 mm depending on the application.
The interior of the square mesh fabric 35 fulfils the function of the separating surface 14.
A further embodiment of the sieve grate 6 is shown in Figs. 5 and 6. A basket 37 having
arms gives the function of the shaping carrier element 13, the struts 38 of which are arranged
in relation parallel to the axis and shown in highlighting. It is evident that the struts 38 are
held with circular extending supporting elements not shown. Here also, the inner
circumference of the basket 37 or the carrier element 13 is coated with the mesh fabric 7.
Here also the region of the bottom of the feeding hopper 19 may be designed as a perforated
plate having the openings 22. In addition, the openings 41 shown in Fig. 3 may be arranged
in the hopper wall 20.
Fig. 7 shows a further embodiment of the device, being similar to the embodiment of Fig. 2 in
a number of details. The guide plates 15 are designed to be bent elements arranged in
inclined manner with respect to the horizontal direction and thus not in parallel to the interior
circumference of the sieve grate 6 in sealed relation. Bores 42 may be arranged near the rim
- 10 -

instead of a comb-like shape of the guide plates 15. It is evident that a number of guide
plates 15 may be arranged evenly distributed about the circumference. Only one guide plate
15 is shown for clarity. The level of the liquid of each single trough-like chamber will vary
during rotation of the sieve grate 6 and permanently change. Dewatering takes place in this
manner and liquid permanently flows back to the channel.
One or more additional spray rails 43 are shown in Fig. 7, the spray rails being positioned
below the perforated plate having the openings 22. These spray rails 43 include nozzles 44
also and may be operated with spraying water and/or pressurized air. The spray rails 43 may
be used in addition or alternatively to the brushes being positioned on the inside of the rim of
the conveying screw in the region of the feeding hopper 19. The spray rails 43 serve or
increase respectively the cleaning of the openings 22 of the perforated plate of the feeding
hopper 19. Preferably, the spray rails and the entire device may be operated discontinuously,
however in those time periods in which the water level 3 in the channel 1 has fallen below a
lower level as shown after cleaning of the sieve grate 6.
The details shown in the drawings may be combined with each other in useful manner within
the scope of the present invention.
- 11 -

LIST OF REFERENCE NUMERALS

1 Channel 11 motor
2 Liquid 12 gear
3 water level 13 carrier element
4 Arrow 14 separation surface
5 Axis 15 guide plate
6 sieve grate 16 detaching device
7 mesh fabric 17 spray rail
8 front side 18 nozzle
9 back side 19 feeding hopper
10 Drive 20 hopper wall
21 side wall 31 pressing zone
22 Opening 32 conduit
23 screw conveyor 33 opening
24 Housing 34 supporting fabric
25 conveying screw 35 fabric with square meshes
26 Shaft 36 mesh aperture
27 drive arm 37 basket with arms
28 planking sheet metal 38 strut
29 discharge point 39 separation wall
30 Container 40 end wall
41 Opening
42 Bore
43 spray rail
44 Nozzle
- 12 -

We claim :-
1. A device for removing material to be screened from a liquid (2) flowing in a channel
(1), the device comprising an inclined, rotatably driven, cylindrical sieve grate (6) which is
partially submerged in the liquid and has an open front side (8) on the inflow side thereof and
guide plates (15) on the inner side thereof, the device being provided with a screw conveyor
(23) comprising a housing (24) and a driven conveying screw (25), the screw conveyor being
coaxially arranged in relation to the sieve grate (6) and leading to a discharge point (29)
outside the liquid, the screw conveyor (23) comprising a feeding hopper (19) for the material
to be screened, in the region of the sieve grate (6), wherein a fixed detaching device (16) for
detaching the material to be screened adhering to a separation surface (14) inside the sieve
grate (6) is provided on the outer side of the sieve grate (6), above the feeding hopper (19),
characterized in that the sieve grate (6) comprises a shaping carrier element (13) and a
mesh fabric (7) forming a separation surface (14), that the feeding hopper (19) is pierced on
the bottom side and in that the guide plates (15) are placed against the separation surface
(14) of the mesh fabric (7) in an axially parallel manner.
2. Device of claim 1, characterized in that the conveying screw (25) of the screw
conveyor (23) is provided with brushes in the region of the sieve grate (6), the brushes
stroking the pierced feeding hopper (19).
3. Device of 1 or 2, characterized in that the guide plates (15) are designed to be
especially comb-like open on the side not facing the mesh fabric (7).
4. Device of one of the claims 1 to 3, characterized in that the shaping carrier element
(13) is provided in form of a supporting fabric (34).
5. Device of one of the claims 1 to 3, characterized in that the shaping carrier element
(13) is provided in form of a basket (37) having arms.
6. Device of one of the claims 1 to 5, characterized in that the detaching device (16)
comprises nozzles (18) to spray water and/or compressed air.
- 13 -

- 14 -
7. Device of one of the claims 1 to 6, characterized in that the feeding hopper (19)
comprises a upwardly extending wall (20) being arranged in the region of the open front side
(8) of the sieve grate (6).
8. Device of one of the claims 1 to 7, characterized in that the mesh fabric (7) is a
square meshes fabric (35) having a mesh aperture (36) between 0,2 and 1,2 mm.
9. Device of one of the claims 1 to 8, characterized in that the feeding hopper (19)
being pierced on the bottom side includes bores having a diameter of about 2 mm.
10. Device of one of the claims 1 to 9, characterized in that three guide plates (15) are
arranged with respect to the separation surface (14).

The invention raises to a device for removing material to be screened from a liquid (2) flowing in a channel (1), Tte device comprises an inched, ralatettdy drioven. cylindrical sieve grate (6) which is partially submerged in the liquid and has an open front side (6) on Ihe inflow site thereof and guide plates (15) on the inner side thereof. The device is provided with a screw conveyor (23) comprising a housing (24) and 3 driven conveying screw (25), the screw conveyor being coaxially arranged in relation to the sieve grate (6) and leading to a discharge point (29) outside the liquid. The screw conveyor (23) comprises a feeding hopper (19) for the material to be screened, in the region of the sieve grate (6). A fixed detaching device (16) for detaching the material to be screened adhering to a separation surface (14) inside the sieve grate (6) is provided on the outer side of the sieva grate (6), above the feeding hopper (19). The sieve grate (6) comprises a shaping carrier element (13) and a mesh fabric (7) forming a separation surface (14). The feeding hopper (19] is pierced on the bottom side.The guideplates (15) are placed against the seperation surface (14) of the mesh fabric (7) in an axially nparallel manner. the mesh fabric (7) in an axially parallel manner.

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Patent Number

215530

Indian Patent Application Number

01512/KOLNP/2005

PG Journal Number

09/2008

Publication Date

29-Feb-2008

Grant Date

27-Feb-2008

Date of Filing

02-Aug-2005

Name of Patentee

HANS HUBER AG MASCHINEN-UND ANLAGENBAU

Applicant Address

INDUSTRIEPARK ERASBACH A1, D-92334 BERCHING, GERMANY.

Inventors:

#	Inventor's Name	Inventor's Address
1	FROMMANN, CHRISTIAN	ALTENHOFWEG 21B, 92318 NEUMARKT, GERMANY.

PCT International Classification Number

E03F 5/14

PCT International Application Number

PCT/EP2004/000387

PCT International Filing date

2004-01-20

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	103 02 494.8	2003-01-23	Germany