Drain locking device for floor drains
A locking drain device for a floor drain comprises a top strainer, a cylindrical middle section having spreadable sides with slits in them, a frustoconical spreader, and a locking bolt, such that, when the spreader is drawn against the spreadable sides of the cylindrical middle section by tightening the locking bolt, the cylindrical sides will be spread to frictionally engage against the internal surface of a drain pipe to prevent inadvertent removal of the floor drain.
1. A drain locking device for affixing floor drains to a drain pipe comprising:
A strainer, a cylindrical middle section, a spreader, and a locking bolt, said strainer having a diameter greater than the diameter of the drain pipe in which said drain locking device is to be installed and further comprising drainage holes and a non-threaded center hold for receiving said locking bolt;
said cylindrical middle section having a diameter smaller than the diameter of the drain pipe and further comprising a top and sides, said top having drainage holes and a non-threaded center hole for receiving said locking bolt,
said sides having one or more splits,
said sides being of sufficient length and being spreadable such that, when said cylindrical middle section is installed within the drain pipe, said sides will contact and press against the inner surface of the drain pipe;
said spreader comprising a disc of sufficient height to form a frustoconical surface and having a largest diameter that is smaller than the diameter of the drain pipe and larger than the diameter of said cylindrical middle section, said spreader having one or more holes for allowing fluid to pass therethrough and a center hole for receiving said locking bolt,
said locking bolt extending through said center hold of said strainer, said center hold of said cylindrical middle section, and said center hole of said spreader, and being secured to said spreader with threaded means,
whereby, when said locking bolt is tightened, said spreader is raised such that said frustoconical surface of said spreader contacts the lower circumferential edge of said cylindrical middle section, and upon further tightening causes said circumferential edge to spread and contact the inner surface to form a frictional engagement that prevents the inadvertent removal of said drain locking device from said drain pipe.
2. The drain locking device claimed in claim 1 , further comprising said slits extending from the bottom of the edge of said cylindrical middle section generally vertically and ending near the top of said cylindrical middle section.
3. The drain locking device claimed in claim 1 , further comprising said slits extending from the bottom of the edge of said cylindrical middle section helically and ending near the top of said cylindrical middle section.
4. The drain locking device claimed in claim 1 wherein, when installed, said holes of said strainer are aligned with said holes of said cylindrical middle section.
5. The drain locking device claimed in claim 1 , further comprising said center hole of said spreader being threaded and being secured in threaded engagement to said threaded locking bolt.