Drain lock

Abstract

A lock for holding a drain screen in place on the end of a drainpipe has a bolt passing through the screen and screwed into a lateral bore of a cross brace within the drainpipe. The cross brace has an elongated body with a longitudinal bore having left and right threaded rods for easy insertion and the bolt has a non-standard head to thwart removal thereof.

1 . In a drain having a drain pipe with an entry end and a drain screen thereover, 
 An assembly for holding said drain screen in place and preventing unauthorized removal thereof, said assembly comprising a threaded thrust bolt for passing through an aperture of said drain screen and means to hold said thrust bolt against removal thereof, said means comprising a diametric cross member in said drainpipe and having an elongated body with a longitudinal bore therethrough, said bore having left hand threads associated with a first end thereof and right hand threads associated with a second end thereof,    a left hand treaded rod screwed into said first end and a right hand threaded rod screwed into said second end; each said rod having an outer end for engagement with an inner side wall of a drain pipe at diametric opposite sides thereof;    said elongated body having a lateral bore therethrough, said lateral bore crossing said longitudinal bore near a mid portion of said longitudinal bore;    said lateral bore having associated threads to engage the threads of a thrust bolt screwed therein;    said thrust bolt having a non-standard head so that it can be removed only with a special tool and when said head is firmly holding said drain screen in place over said entry end, said drain screen is held against unauthorized removal.    
     
     
         2 . The assembly of  claim 1  in which the end of at least one of said rods is pointed to engage said inner pipe wall.  
     
     
         3 . The assembly of  claim 1  in which said lateral bore is threaded along its length.  
     
     
         4 . The assembly of  claim 1  in which said longitudinal bore is threaded along its length.