Abstract In a spin filter, a hollow mandrel is rotatable axially in a filter tank and has mounted thereon a multiple of concentric porous hollow filter discs which open centrally into said mandrel. Liquid, containing impurities, and in some instances mixed with a purifying agent such as dietamaceous earth is delivered into the tank, the impurities being removed therefrom as the liquid passes through the filter discs into the mandrel from one end of which the filtrate is recovered. It is customary to depend on a periodical reverse flow of filtrate through the filter while spinning the mandrel, for cleaning the deposit of impurities from the filter discs. Following this operation, the deposits thus loosened into the liquid in the tank are flushed from the tank to waste. The present invention quickens and enhances the cleansing of the filter discs by providing an inexpensive series of brushes disposed between adjacent pairs of filter discs by which the latter are scrubbed during the filter rotating and back washing operation.
A brushing accessory for a spin filter mounted in a tank for confining a liquid to be filtered and comprising a rotatable hollow mandrel on which a series of spaced filter discs are concentrially mounted in spaced relation, said accessory comprising: a bar located inside said tank parallel with said mandrel and between said filter discs and said tank; means for mounting said bar on said tank; a series of parallel brushes spaced apart equidistant with the spacing of said filter discs with one brush being disposed between each adjacent pair of said discs and in constant scrubbing relation with the juxtaposed filtering faces of said pair of discs; means for rotatably mounting the inner end of each brush on said mandrel; and means for attaching the outer end of each brush to said bar.
Claim 2
Dependent Claim
135 words
A brushing accessory for a spin filter mounted in a tank for confining a liquid to be filtered and comprising a rotatable hollow mandrel on which a series of spaced filter discs are concentrially mounted in spaced relation, said accessory comprising: a bar located inside said tank parallel with said mandrel and between said filter discs and said tank; means for mounting said bar on said tank; a series of parallel brushes spaced apart equidistant with the spacing of said filter discs with one brush being disposed between each adjacent pair of said discs and in constant scrubbing relation with the juxtaposed filtering faces of said pair of discs; means for rotatably mounting the inner end of each brush on said mandrel; and means for attaching the outer end of each brush to said bar.
Claim 3
Dependent Claim
41 words
A brushing accessory as recited in claim 1 wherein said bar is located above said filter discs and wherein said means for rotatably mounting the inner end of each brush on said mandrel comprises a hook means rotatably fitting said mandrel.
Claim 4
Dependent Claim
133 words
A filter disc brushing accessory as recited in claim 2 wherein each of said brushes has a stem formed of twisted stainless steel wire between the strands of which a layer of plastic bristles are trapped to form a cylindrical brush embodied with each of said stems; and wherein said bar is provided with a series of transverse holes, one for each of said brush stems, each of said stems being bent near its upper end, extended through one of said holes and then rebent downwardly to unite the upper end of said stem with said rod; and wherein said hook means consists in a lower end portion of the stem of said brush and located below the lower end of said brush and bent upwardly to hook around the spin filter mandrel.