RAMPED CAP UNIT FOR A MAIN POOL DRAIN COVER PLATE

摘要

A ramped cap unit (10) is provided for installation into a swimming pool in a position covering a main pool drain equipped with an upstanding antivortex safety drain cover plate (12), wherein the ramped cap unit (10) has a smoothly contoured shape to permit a pool cleaner device (18) to travel thereover without interrupting or obstructing cleaning operation. The cap unit (10) comprises a generally inverted saucer defining a smoothly sloping and convex or ramped upwardly presented surface having a diametric size and shape to fit over the safety drain cover plate (12). An array of ribs (44) formed on the underside of the cap unit (10) engage an outer periphery of the upstanding cover plate (12) to retain the cap unit (10) in position thereon. A large plurality of vents (40, 68) are formed in the cap unit (10) at spaced-apart locations to permit downward water flow therethrough substantially without disrupting the antivortex and safety functions of the underlying drain cover plate (12).