Back to results
US 4,220,540 AGranted
Filtering scraper
OwnerTadashi Hagiharainventor
Life of this patent
Estimating the term…
Abstract
A filtering system that includes a cleaning assembly and a filter element in the form of a plate with a plurality of long, narrow through openings or slits in each of a plurality of rows. The cleaning assembly includes a slit-cleaning system connected downstream of the filter element to clean each slit. The cleaning assembly may also include a scraper cleaning system positioned upstream of the filter element. As fluid enters the filtering system, the debris or trash is filtered from the fluid and deposited on the upstream surface of the filter element and in the slits for removal by the cleaning assembly.
Claims12
In a filter cleaning system, a filter comprising:
- a body of sheet material having a generally broad upstream surface and downstream surface with a plurality of individual, spaced apart, long, narrow through openings,
- each said opening having an entrance on said upstream surface and an exit on said downstream surface with said exits being larger than each said entrance,
- each said exit aligned with respect to said entrance,
- each said opening including side walls and end walls sloping away from the opposite wall between said entrance and said exit, and
- each said exit having interconnection means in said downstream surface that extend between adjacent exits, said interconnection means for guiding slit-cleaning fingers from one entrance to an adjacent entrance.
2 more elements
In a filter assembly, comprising:
- a filter for filtering foreign matter out of a fluid,
- a cleaning means for cleaning foreign matter from the filter,
- said filter including a body of sheet material having a generally broad upstream surface and broad downstream surface, said body having a plurality of individual spaced apart, long, narrow through openings in aligned rows and columns,
- each said opening having an entrance on said upstream surface and an exit on said downstream surface with sides, each said exits being larger than each said entrance,
- each said opening including side walls and end walls sloping away from the opposite wall between said entrance and said exit,
- said cleaning means including a plurality of slit-cleaning elements connected to a movable element holding means for positioning each said element to move along a column of said openings in a plurality of rows and to move each element into each said entrance in said filter for removing debris deposited in said opening, and
- said cleaning means connected to said filter assembly,
- said filter assembly includes means for guiding said cleaning elements through said end wall from said entrance in one column to said entrance in the adjacent column.
5 more elements
In a filter assembly, comprising:
- a filter for filtering foreign matter out of a fluid,
- a cleaning means for cleaning foreign matter from the filter,
- said filter including a body of sheet material having a generally broad upstream surface and broad downstream surface, said body having a plurality of individual spaced apart, long, narrow through openings in aligned rows and columns,
- each said opening having an entrance on said upstream surface and an exit on said downstream surface with sides, each said exits being larger than each said entrance,
- each said opening including side walls and end walls sloping away from the opposite wall between said entrance and said exit,
- said cleaning means including a plurality of slit-cleaning elements connected to a movable element holding means for positioning each said element to move along a column of said openings in a plurality of rows and to move each element into each said entrance in said filter for removing debris deposited in said opening, and
- said cleaning means connected to said filter assembly downstream of said filter,
- said holding means for moving each element through said entrance to push the foreign matter in said opening upstream,
- each said column opening is aligned along their longitudinal axis,
- a scraper cleaning means connected to said filter assembly for cleaning the upstream surface of said filter.
7 more elements
Dependencies are inferred from the claim text.