Grated drain basket with seal collar

Abstract

The present invention is a basket that is sealingly insertable in a grated drain. The basket is formed from inexpensive but surprisingly tough and effective polymer grating to which is bonded polymer sheet at the upper basket edges. The polymer sheet is wide enough so that it the grate of the grated drain can be picked up and put back into its concrete inset, capturing the polymer sheet edges under its heavy weight. The captured polymer sheet forms a peripheral seal between the pavement surface and the drain so that substantially all the water must pass through the basket.

I claim:  
     
         1 . An easily insertable and removable drain box for grated drains with a grate that is supported from a support ledge comprising: 
 (a) the grated drain having a drain passage below the support ledge with support means lodged in walls of the drain passage where open top box substantially all of polymer mesh with a top opening about the size of a lateral cross section of the drain passage of the grated drain is supported on the support means;    (b) a flexible waterproof sheet sealingly attached to a top edge of the open top box and draped upward over at least substantially the entire periphery of the support ledge; and    (c) the grate supported from the support ledge so that its weight sealingly captures a periphery of the flexible waterproof sheet.    
     
     
         2 . The drain box of  claim 1  wherein the drain box is formed from two half pieces.  
     
     
         3 . The drain box of  claim 2  wherein at least one of the half pieces is formed from a flat sheet of polymer mesh.  
     
     
         4 . The drain box of  claim 1  wherein the drain box comprises filter media covering a bottom section so that at least part of water flowing from the pavement level is filtered therethrough.  
     
     
         5 . The drain box of  claim 4  wherein the drain box comprises filter media on a lowermost periphery of walls of the drain box and sealingly continuous with filter media on the bottom section.  
     
     
         6 . The drain box of  claim 1  wherein polymer mesh defines openings spaced from about 0.1 to about 0.3 inches apart and have hydraulic cross sections of from about 0.1 square inches to about 0.7 square inches.  
     
     
         7 . The drain box of  claim 6  wherein the polymer mesh is from about 0.2 inches to about 0.5 inches thick.  
     
     
         8 . The drain box of  claim 1  wherein the drain box is formed from two half pieces.  
     
     
         9 . The drain box of  claim 3  wherein the polymer mesh is foldable.  
     
     
         10 . The drain box of  claim 9  wherein the flat piece of polymer mesh defines two cut lines so that side parts are folded forming overlap zones in the assembled box.  
     
     
         11 . The drain box of  claim 3  wherein two half pieces are slidable over each other's mirror image bottom and side sections thereby shortening or lengthening the box.  
     
     
         12 . The drain box of  claim 11  wherein an overlap of the two half pieces at the bottom and side sections is secured together.  
     
     
         13 . The drain box of  claim 1  wherein pocket means formed at top edges of the drain box are adapted to encase rigid support rods.  
     
     
         14 . The drain box of  claim 13  wherein two pocket means opposite each other secure legs of a U-shaped rigid support rod.  
     
     
         15 . The drain box of  claim 14  wherein pocket means between the two opposite pocket means secures a bottom section of the U-shaped rigid support rod.