Patent ID: 8887818

Claim:
A downhole tool for sealing a well casing comprising: a mandrel formed of composite material defining a longitudinal axis for said downhole tool, said mandrel extending longitudinally about said longitudinal axis, having an exteriorly threaded upper portion, a smooth intermediate portion and a lower end, said lower end of said mandrel having a larger diameter than said upper portion and said intermediate portion, and said mandrel having a mandrel bore extending interiorly within said mandrel; a lock ring threadingly secured to said mandrel, said lock ring having an annular-shaped body which extends circumferentially about said mandrel; a lock ring sleeve disposed circumferentially around and projecting beneath said lock ring; a ratchet ring 82 disposed exteriorly about said mandrel and disposed adjacent to and beneath said lock ring sleeve, said ratchet ring sleeve having a cylindrical body with a slot extending longitudinally through a sidewall of said cylindrical body, and further having an inner threaded surface and an outer threaded surface, wherein said interior threaded surface has a higher thread pitch than said outer thread surface; a ratchet sleeve having a continuous annular shaped body which circumferentially extends about an exterior of said ratchet ring, said ratchet sleeve further having interior threads which engage said outer threaded surface of said ratchet ring, wherein said ratchet ring will expend expand and allow movement of said ratchet ring downward over said mandrel and will not expand such as to prevent said mandrel from moving downward within said ratchet sleeve; a seal assembly having elastomeric packer elements which are squeezed when the plug tool is set to sealingly engage between said mandrel and the casing within the well; at least one slip body disposed on at least one side of said seal assembly; said at least one slip body having an annular shaped groove formed into an exterior surface thereof for receiving anchor cleats, which are secured by a plurality of fasteners within said groove and a separate fastener for each cleat, each cleat being secured within the groove by the fastener for such cleat, the cleats being disposed in spaced apart relation, extending about a longitudinal axis of said mandrel, the fasteners securing said anchor cleats within said at least one slip body; and wherein said downhole tool is moved to a set position by moving said locking ring sleeve and said ratchet sleeve downward to urge the at least one slip body to move outward and upon a conically shaped surface of said downhole tool.