Water Drainage System

Abstract

The current invention discloses a water drainage system designed for securing a waterproof membrane as well as centering a wastewater pipe. The water drainage system has a coupling mechanism including a lower drain body and a pipe-capturing member. The lower drain body may be installed in a substrate medium, such as a shower pan, onto which a waterproof membrane would be fixed. The pipe-capturing member has two frusto-conical designs which allow the pipe-capturing member to be firmly asserted into the lower drain body and at the same time center and secure the wastewater pipe. The pipe-capturing member and the lower drain body each has a flange wherein the two flanges trap and secure the waterproof member in place. Additional structures such as a drain trim holder may also be adopted to allow easier adjustment. The current invention is particularly useful for shower pan drainage.

What is claimed is: 
     
         1 . A water drainage system to secure a wastewater pipe and a waterproof membrane, comprising:
 a lower drain body encircling a receiving hole having a first diameter, a top part of the lower drain body being a lower drain flange that extends radially outwardly, the lower drain flange having an upper surface sloped to the center of the receiving hole, the lower drain body further having a cylindrical section below the lower drain flange;   a pipe-capturing member having a generally tubular section encircling a pipe hole and a top flange that extends radially outward, the tubular section having an exterior diameter and an interior diameter, the top flange being positioned on top of the tubular section;   wherein
 the tubular section of the pipe-capturing member is inserted into the receiving hole of the lower drain body, and 
 the top flange has a sloped lower surface, the sloped lower surface is substantially parallel to the upper surface of the lower drain flange. 
   
     
     
         2 . The water drainage system of  claim 1 , wherein
 the exterior diameter of the tubular section is tapered and decreases from top, defined as the part closer to the top flange, to bottom, allowing the pipe-capturing member to be inserted into receiving hole of the lower drain body, and   the interior diameter of the tubular section is tapered and increases from top to bottom, allowing the pipe-capturing member to secure and center a waste water pipe.   
     
     
         3 . The water drainage system of  claim 2 , wherein
 the tubular section of the pipe-capturing member has a maximum exterior diameter substantially equal to the first diameter of the receiving hole, and   the tapered exterior surface permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the tubular section is inserted into the receiving hole.   
     
     
         4 . The water drainage system of  claim 2 , wherein
 the tubular section of the pipe-capturing member has a minimum interior diameter substantially equal to the outside diameter of the waste water pipe, and   the tapered interior surface permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the waste water pipe is inserted into the pipe hole of the pipe-capturing member.   
     
     
         5 . The water drainage system of  claim 1 , wherein the cylindrical section of the lower drain body has a lower part that has a threaded exterior surface, defining a threaded section. 
     
     
         6 . The water drainage system of  claim 5 , further comprising an anchoring nut having a threaded interior, the anchoring nut being fastened to the threaded section of the lower drain body for the purpose of securing the lower drain body to a substrate. 
     
     
         7 . The water drainage system of  claim 1 , wherein the top flange of the pipe-capturing member has an upper interior edge, the upper interior edge is shaped as a radial chamfer, forming a funnel shape, there are integral weeping holes through the pipe-capturing member, the weeping holes having openings on the radial chamfer of the upper interior edge of the pipe-capturing member and having an angle to facilitate draining into the pipe hole, and the integral weeping holes in the pipe-capturing member are substantially parallel to the top surface of the upper flange of the pipe capturing member. 
     
     
         8 . The water drainage system of  claim 1 , further comprising a substrate medium surrounding the lower drain body, the substrate medium has a top surface and the top surface slopes to a lowest middle point, wherein the lowest middle point in the substrate medium coincides with the location of an inlet of a wastewater pipe 
     
     
         9 . The water drainage system of  claim 8 , further comprising a drain trim holder having horizontal saw tooth exterior walls, square tooth interior walls, and a flat bottom surface, the drain trim holder being positioned above the pipe-capturing member. 
     
     
         10 . The water drainage system of  claim 11 , further comprising a drain plate and mounting screws, wherein the drain plate being positioned over the drain trim holder,
 there are vertical holes on the pipe-capturing member, and   the mounting screws connect the drain trim holder to the pipe-capturing member by insertion into the vertical holes.   
     
     
         11 . The water drainage system of  claim 10 , wherein there are screw holes on the drain trim holder for the insertion of the mounting screws, the screw holes being substantially bigger than the diameter of the mounting screws, allowing limited re-positioning of the drain plate. 
     
     
         12 . A water drainage system to secure a wastewater pipe and a waterproof membrane, comprising
 a lower drain body encircling a receiving hole having a generally uniform first diameter, a top part of the lower drain body being a lower drain flange that extends radially outwardly, the lower drain flange having an upper surface sloped to the center of the receiving hole, the lower drain body further having a cylindrical section below the lower drain flange;   a pipe-capturing member having a generally tubular section encircling a pipe hole and a top flange that extends radially outward, the tubular section has an exterior diameter and an interior diameter, the top flange being positioned on top of the tubular section and having a sloped lower surface, the sloped lower surface is substantially parallel to the upper surface of the lower drain flange;   an anchoring nut;   a drain trim holder; and   a drain plate;   wherein
 the exterior diameter of the tubular section is tapered and decreases from top, defined as the part closer to the top flange, to bottom, allowing the pipe-capturing member to be inserted into the receiving hole of the lower drain body, 
 the interior diameter of the tubular section is tapered and increases from top to bottom, allowing the pipe-capturing member to secure and center a waste water pipe inserted into the pipe hole, 
 the top flange of the pipe-capturing member and the lower drain flange of the lower drain body hold flush and secure the waterproof membrane, which covers a substrate medium, 
 the anchoring nut is attached to the cylindrical section of the lower drain body, the drain trim holder is positioned above the pipe-capturing member, and the drain plate covers the drain trim holder. 
   
     
     
         13 . The water drainage system of  claim 12 , wherein:
 the top flange of the pipe-capturing member has an upper interior edge, the upper interior edge is shaped as a radial chamfer, forming a funnel shape, and   there are integral weeping holes the pipe-capturing member, the weeping holes having openings on the radial chamfer of the upper interior edge of the pipe-capturing member and having an angle to facilitate draining into the pipe hole.   
     
     
         14 . The water drainage system of  claim 13 , wherein:
 the tubular section of the pipe-capturing member has a maximum exterior diameter substantially equal to the first diameter of the receiving hole, and   the tapered exterior surface permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the tubular section is inserted into the receiving hole.   
     
     
         15 . The water drainage system of  claim 14 , wherein:
 the cylindrical section of the lower drain body has a lower part that has a threaded exterior surface, defining a threaded section, and   the anchoring nut has a threaded interior, the anchoring nut being fastened to the threaded section of the lower drain body for the purpose of securing the lower drain body to a substrate.   
     
     
         16 . A water drainage system to secure a wastewater pipe and a waterproof membrane, comprising:
 a lower drain body encircling a receiving hole having a generally uniform first diameter, a top part of the lower drain body being a lower drain flange that extends radially outwardly, the lower drain flange having an upper surface sloped to the center of the receiving hole, the lower drain body further having a cylindrical section below the lower drain flange;   an outer capturing member having an outer capturing member tubular section encircling an outer capturing member hole and an outer capturing member top flange that extends radially outward, the tubular section having an exterior diameter and an interior diameter, the outer capturing member top flange being positioned on top of the tubular section and having a sloped lower surface, the sloped lower surface is substantially parallel to the upper surface of the lower drain flange;   an inner connecting member having a inner connecting member tubular section encircling an inner connecting member hole and an inner connecting member top flange that extends radially outward;   an anchoring nut;   an adapter;   a first bushing and a second bushing;   a drain trim holder having a stepped inner flange; and   a drain plate;   wherein
 the exterior diameter of the outer capturing member tubular section is tapered and decreases from top, defined as the part closer to the outer capturing member top flange, to bottom, allowing the outer capturing member to be inserted into the receiving hole of the lower drain body, 
 a lower section of the outer capturing member tubular section is threaded, the first bushing and the second bushing are inserted into the outer capturing member hole, the first bushing being above the second bushing, 
 the inner connecting member tubular section fits through the drain trim holder into the first bushing, 
 the outer capturing member top flange and the lower drain flange of the lower drain body hold flush and secure the waterproof membrane, which covers a substrate medium, 
 the adapter and the anchoring nut are attached to the threaded part of the outer capturing member tubular section, 
 and the drain plate covers the drain trim holder. 
   
     
     
         17 . The water drainage system of  claim 16 , there are weeping holes through the inner connecting member tubular section. 
     
     
         18 . The water drainage system of  claim 16 , wherein the inner connecting member allows the drain trim holder to be repositioned when the inner connecting member is inserted through the drain trim holder. 
     
     
         19 . The water drainage system of  claim 16 , further comprising a splash wall disposed adjacent to the substrate medium, the splash wall being covered by the waterproof membrane wherein the splash wall has a splash wall void. 
     
     
         20 . The water drainage system of  claim 19 , wherein the waterproof membrane is folded and the fold-up portions of the waterproof membrane is disposed on the splash wall void.