Drain sealing apparatus

Abstract

A drain lock sealing apparatus is positioned in a drain pipe for being locked therein and further for sealing the pipe to prevent odors and vermin from coming from the drainpipe into the room. The apparatus includes a grate positioned over the drain pipe, a resiliently deformable sealing ring extending from the grate into the drainpipe, an rigid expander member with an inwardly tapered outer surface extending into the sealing ring, a resiliently deformable frusta-conical member attached to center hub of the expander member so that the peripheral closure edge of the frusta-conical member is in non-fixed normally closed relationship against the circumferential edge of the expander member so that the closure edge opens in response to liquid passing through the grate into the drain and resumes normally close relationship in response to the secession of liquid passing through the grate. A bolt extends through the grate and cylindrical sealing ring and is screwed into the axial hole whereby tightening of the bold compresses the sealing ring axially to deform the cylindrical sealing ring radially into clamping engagement against the interior surface of the drain pipe.

1 . A drain lock sealing apparatus for being positioned in a drain pipe below a surface mounted grate in a room area, the drain pipe having an interior surface, the drain lock sealing apparatus comprising:
 A grate for positioning over the drain pipe;   A cylindrical sealing ring defining a cylindrical space through which liquid flows into the drain, the cylindrical sealing ring coupled to the grate for projecting into the drainpipe, the sealing ring being resiliently deformable and having an outer surface positioned adjacent the interior surface of the drain pipe;   An expander member have a cylindrical outer body with a first end position facing the grate, a second end with a circumferential edge facing into the drain pipe, the expander member having an outer cylindrical surface tapered inwardly from the second end to the first end, the first end being inserted in the cylindrical space of the cylindrical sealing ring, the expander member having a center hub with an axial hole therethrough, the axial hole having bolt receiving thread therein;   A resiliently deformable closure member having a central region and a peripheral closure edge, the central region affixed to the center hub of the expander member with the peripheral closure edge positioned against the circumferential edge of the expander member in non-fixed, normally closed relationship, the peripheral closure edge opening in response to liquid passing through the grate into the drain and resuming the normally close relationship in response to the secession of liquid passing through the grate; and   A bolt extending through the grate, cylindrical sealing ring and screwed into the axial hole with the threads therein for compressing the sealing ring axially to deform the cylindrical sealing ring radially into clamping engagement against the interior surface of the drain pipe.   
     
     
         2 . The drain lock sealing apparatus of  claim 1  wherein the resiliently deformable member has a frusta conical shape. 
     
     
         3 . The drain lock sealing apparatus of  claim 1  further comprising a connector ring having a cylindrical space terminating at a lower edge, the ring positioned between the cylindrical sealing ring and the grate, the cylindrical sealing ring having cylindrical peripheral edge press fitted into the cylindrical space of the connector ring abutting the lower edge of the connector ring. 
     
     
         4 . The drain lock sealing apparatus of  claim 1  wherein the expander member has at least one support spoke connecting cylindrical out body to the center hub. 
     
     
         5 . The drain lock sealing apparatus of  claim 1  further comprising a threaded insert affixed in the axial hole for receiving the bolt therein. 
     
     
         6 . The drain lock sealing apparatus of  claim 1  wherein the center hub further comprises an upward projecting cylindrical post and a clamping ring for being positioned in frictional engagement with the cylindrical post, the central region of the closure member clamped between the center hub and the clamping ring press fitted over the cylindrical post. 
     
     
         7 . The drain lock sealing apparatus of  claim 1  wherein expander member is made of a rigid material.