Liquid purification or separation – Flow – fluid pressure or material level – responsive
Reexamination Certificate
2005-09-13
2005-09-13
Cecil, Terry K. (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
C210S391000, C210S393000, C210S400000, C210S401000, C239S597000, C239S601000
Reexamination Certificate
active
06942786
ABSTRACT:
Cleaning device having an endless filtering belt (31) guided through a waste water container (33) for filtering of waste water. The filtering belt is guided over a series turn rollers (32, 34, 36, 37) so that the belt in a certain region runs substantially horizontally with the filtrate faced downwards. Within this region there is a rod shaped blowoff device (43) for blowing air towards the filtering belt. Below the blowoff device (44) there is arranged a screw conveyor (42) for removing residues dislodged from the filter mesh. The filtering belt (31) is located adjacent to a transmission belt (51) and is pressed against the same by a clamping rail (58) within the rising section (38) of the filtering belt. The device is provided with a control device (4) adapting the filtering belt movement with the waste water supply, thus keeping the waste water surface below a certain level to provide a high degree of dewatering within the upwards rising section of the filtering belt (31). The blowoff device (43) is shaped to produce a knife shaped air beam directed towards the filtering belt from a sufficiently short distance to effect substantially full penetration through the openings of the filtering belt. The lateral edges of the filtering belt are covered by a tight cover band (66) pressed downwards by a soft elastic pressure lip (64).
REFERENCES:
patent: 3012677 (1961-12-01), Hungate
patent: 3464563 (1969-09-01), Gonzalez et al.
patent: 4008158 (1977-02-01), Davis
patent: 4242205 (1980-12-01), Hirs
patent: 4468320 (1984-08-01), Schmidt
patent: 5202017 (1993-04-01), Hunter
patent: 1352960 (1964-01-01), None
patent: WO87/02266 (1987-04-01), None
patent: WO94/26387 (1994-11-01), None
Bracewell & Giuliani LLP
Cecil Terry K.
Salnes Filter AS
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