Fastening system using an axially magnetized threaded insert
Disclosed is an improved fastening system that leverages magnetism to assist in the installation of a fastener. The system may include an axially magnetized insert adapted to be secured within a bore in a surrounding material. The insert may be composed of a material having a magnetic permeability that is higher than that of the surrounding material. The insert may include a helical threaded interior surface adapted to receive a ferromagnetic screw. When placed in proximity of the insert, the tip of the screw is pulled into and held in alignment with the insert by the magnetic field emanating from the magnet. The fastening system may be particularly beneficial in environments where positioning or holding the screw in the starting position is difficult.
1 . A method for fastening comprising:
securing a magnet to a surrounding material;
securing a ferromagnetic insert within a bore in the surrounding material;
after securing the ferromagnetic insert within the bore, positioning a ferromagnetic screw such that the tip of the screw is held in place against one end of the ferromagnetic insert by a magnetic field emanating from the magnet; and
after the ferromagnetic screw is held in place by the magnetic field, rotating the ferromagnetic screw into engagement with a helical threaded interior surface of the insert.
2 . The method of claim 1 , wherein at least one of the insert and the screw is formed of a material selected from a group consisting of iron, nickel, carbon steel, ferritic steel, duplex grade steel, martensitic grade steel, and precipitation hardened grade steel.
3 . The method of claim 1 , wherein the exterior surface of the insert is helical threaded and securing the insert within the bore includes rotating the threaded exterior surface of the insert into engagement with a helical thread on the interior surface of the bore.