Floor drain with membrane strainer

Abstract

A floor drain with membrane strainer includes a main body having a pit, a top flat grate, and a strainer assembly mounted in the main body below the flat grate. The strainer assembly includes a disc-shaped base that has an annular plate portion with a downward inner flange, and a U-sectioned cup portion having a bottom central hole and being supported in the annular plate portion by ribs with an open area left between them; a membrane strainer made of an elastic and flexible material and having a thin annular portion, on which locating rods are provided for engaging with locating holes on the base to thereby fix the membrane strainer below the flange to normally seal the open area; and a gasket ring fitted around the base for the whole strainer assembly to stably seat in the pit of the main body.

1 . A floor drain with membrane strainer, comprising a main body having a funnel-shaped pit formed therein, a flat grate closed to an open top of said main body, and a strainer assembly fixedly mounted in said pit between said main body and said flat grate; said strainer assembly including: 
 a base in the form of a disc-shaped member and including: 
 an annular plate portion located at a radially outer part of said base, and being provided along a lower inner edge with a downward flange; and  
 a U-sectioned cup portion having a bottom central hole; an elastic element being received in said cup portion and compressed between said flat grate and said cup portion; and said cup portion being integrally supported at a center of said annular plate portion by at least one rib extended across said annular plate portion; and  
   a membrane strainer made of an elastic and flexible material and including a thin annular portion, said membrane strainer being fitted below said annular plate portion and said cup portion of said base to normally seal an open area between said annular plate portion and said cup portion; and said membrane strainer having a radially outer peripheral area that is smoothly bent to separate from the lower inner edge of said flange when said membrane strainer is subjected to a weight of drain water flowing therethrough, so as to provide a water passage between said flange and said membrane strainer, and automatically restores to a horizontal state to seal said open area again when the drain water stops.    
     
     
         2 . The floor drain with membrane strainer as claimed in  claim 1 , further comprising a gasket ring for fixing around an outer edge of said annular plate portion of said base to stably seat said strainer assembly on an inner wall of said main body.  
     
     
         3 . The floor drain with membrane strainer as claimed in  claim 1 , further comprising a seal ring located between said elastic element and said cup portion of said base.  
     
     
         4 . The floor drain with membrane strainer as claimed in claims  1 , wherein said membrane strainer is provided on a top with upward projected locating rods, and said base being correspondingly provided at predetermined positions with locating holes for engaging with said locating rods.  
     
     
         5 . The floor drain with membrane strainer as claimed in claims  2 , wherein said membrane strainer is provided on a top with upward projected locating rods, and said base being correspondingly provided at predetermined positions with locating holes for engaging with said locating rods.  
     
     
         6 . The floor drain with membrane strainer as claimed in claims  3 , wherein said membrane strainer is provided on a top with upward projected locating rods, and said base being correspondingly provided at predetermined positions with locating holes for engaging with said locating rods.  
     
     
         7 . The floor drain with membrane strainer as claimed in  claim 4 , wherein said locating holes are provided on said at least one rib on said base.  
     
     
         8 . The floor drain with membrane strainer as claimed in  claim 5 , wherein said locating holes are provided on said at least one rib on said base.  
     
     
         9 . The floor drain with membrane strainer as claimed in  claim 6 , wherein said locating holes are provided on said at least one rib on said base.  
     
     
         10 . The floor drain with membrane strainer as claimed in  claim 1 , wherein said annular plate portion of said base has an outer edge formed into a bevel surface, said cup portion of said base having a stepped lower edge, and said flange of said base having a stepped lower inner edge.  
     
     
         11 . The floor drain with membrane strainer as claimed in  claim 2 , wherein said annular plate portion of said base has an outer edge formed into a bevel surface, said cup portion of said base having a stepped lower edge, and said flange of said base having a stepped lower inner edge.  
     
     
         12 . The floor drain with membrane strainer as claimed in  claim 3 , wherein said annular plate portion of said base has an outer edge formed into a bevel surface, said cup portion of said base having a stepped lower edge, and said flange of said base having a stepped lower inner edge.  
     
     
         13 . The floor drain with membrane strainer as claimed in  claim 1 , wherein said membrane strainer has a central hole, and wherein said thin annular portion of said membrane strainer is provided along at least one of an inner and an outer edge thereof with an annular rib.  
     
     
         14 . The floor drain with membrane strainer as claimed in  claim 2 , wherein said membrane strainer has a central hole, and wherein said thin annular portion of said membrane strainer is provided along at least one of an inner and an outer edge thereof with an annular rib.  
     
     
         15 . The floor drain with membrane strainer as claimed in  claim 3 , wherein said membrane strainer has a central hole, and wherein said thin annular portion of said membrane strainer is provided along at least one of an inner and an outer edge thereof with an annular rib.  
     
     
         16 . The floor drain with membrane strainer as claimed in  claim 2 , wherein said gasket ring is provided along an inner edge with an annular groove having a cross section corresponding to a configuration of the outer edge of said annular plate portion of said base, and has a lower outer edge formed into a bevel surface corresponding to a slant inner surface of said funnel-shaped pit of said main body.  
     
     
         17 . The floor drain with membrane strainer as claimed in  claim 1 , further comprises a supporting element mounted in said pit of said main body below said strainer assembly, so that said strainer assembly is always supported by said supporting element to locate at a fixed position in said main body.  
     
     
         18 . The floor drain with membrane strainer as claimed in  claim 2 , further comprises a supporting element mounted in said pit of said main body below said strainer assembly, so that said strainer assembly is always supported by said supporting element to locate at a fixed position in said main body.  
     
     
         19 . The floor drain with membrane strainer as claimed in  claim 3 , further comprises a supporting element mounted in said pit of said main body below said strainer assembly, so that said strainer assembly is always supported by said supporting element to locate at a fixed position in said main body.