Patent ID: 8100617

Claim:
A threaded body assembly for use with a helically threaded cylindrical member, said assembly comprising: a first body defining a first threaded bore defining an axis and extending therethrough and having a first engagement surface disposed in a plane oriented substantially perpendicular to said axis, said first body further defining a first recess in said first engagement surface; a second body defining a second threaded bore extending therethrough and having a second engagement surface disposed in a plane oriented substantially perpendicular to said axis, said second body further defining a second recess in said second engagement surface; at least one frangible member coupling said first and second bodies together in an initial configuration with said frangible member being coupled to said first body within said first recess and being coupled to said second body within said second recess, said frangible member extending across an axial distance separating said first and second engagement surfaces, and wherein, when said first and second bodies are in said initial configuration, said first and second threaded bores are positioned coaxially with said first engagement surface facing said second engagement surface, said axial distance separating said first and second engagement surfaces permitting said first and second threaded bores to be simultaneously threadingly engaged with the threaded cylindrical member whereby simultaneous rotation of said first and second bodies relative to the threaded cylindrical member axially repositions said first and second bodies on the threaded cylindrical member; wherein rotating one of said first and second bodies relative to both the threaded cylindrical member and the other of said first and second bodies severs said frangible member leaving a freely extending frangible member stub; further relative rotation of said one body relative to both the threaded cylindrical member and other body bringing said first and second engagement surfaces into bearing contact with said frangible member stub being disposed at least partially in at least one of said first and second recesses; and wherein said frangible member defines a frangible zone axially disposed within one of said first and second recesses, said frangible member defining a variable cross sectional area in cross sections oriented perpendicular to said axis, said frangible zone defining a first cross sectional area wherein said first cross sectional area is less than the cross sectional areas defined by said frangible member outside said frangible zone.