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Vinidex Tubemakers Pty. Limited

Peter J Snelling

A grate cover in combination with a swimming pool being installed in a recess in the top of a sump. The grate is formed of an upper and a lower section. The upper section exhibits four squares or four triangles therein, The upper section has a dome-shaped configuration and has four square or triangular shapes therein, depending on the geometric division therein, each shape has openings therein. The lower section has four trapezoid shapes therein. Each of the shapes of the upper section, whether square or triangular, has a concave surface curvature therein at a transition between the upper and the lower section. Each of the trapezoids of the lower section has two concave surfaces- curvatures therein. One curvature extends in a first direction from the upper section toward an outside edge of grate cover. The other second concave curvature extends in a direction which is normal to the first direction. This way, the forceful suction within the sump cannot obtain enough force to suction the skin of a human onto the grate cover to cause any injuries. The curvatures in the top of the grate cover will always induce a lateral flow under a human body no matter how much of the grate is covered by the body.

Safety grate cover for a swimming pool

Cutting of plastic sheet

A back flushable filter which has a number of separable sections (2) which can be separately accessed and there can be provided a flow pattern so that one of the sections is being back flushed while the other sections are providing normal filtering. A valve configuration (11) providing for such access can be inched around to select each section in term. The filter preferably comprises a stack of separable segments which provide for inclined gaps between adjacent parts of each adjoining stack element with the convergents and gap size selected to encourage compaction of particles within the converging part of each gap but further selected such that on back flushing such compacted particles can be readily disgorged for total cleansing.

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West Lakes, Australia

Peter J Snelling