Patent ID: 6145817
Filing Date: 2000-11-14
Classification: B01F,C02F,Y02W

Abstract:
A water aerating device comprising:a rigid, round, support plate that in an operating position is disposed essentially horizontally, said support plate having at least one opening allowing air to pass therethrough;an elastic plate of elastomeric material, wherein said elastic plate rests on said support plate and is provided with a plurality of fine slits such that by means of said at least one opening of said support plate, air can be introduced between said support plate and said elastic plate for expanding said slits, said elastic plate being provided with an annular rim on an outer peripheral portion thereof, said rim resting against an outer surface of said support plate; anda fastening ring that surrounds said support plate and is axially displaceable relative thereto, said fastening ring being provided with a radially inwardly directed projection that is adapted to act upon said rim of said elastic plate such that displacement of said fastening ring in a fastening direction results in an increase of a distance of said rim from a surface of said support plate that faces said elastic plate.